CN116516084A - Blast furnace smelting method for quantitatively and modularly and precisely controlling w ([ Si ]) by using coal to regulate temperature - Google Patents
Blast furnace smelting method for quantitatively and modularly and precisely controlling w ([ Si ]) by using coal to regulate temperature Download PDFInfo
- Publication number
- CN116516084A CN116516084A CN202211494749.7A CN202211494749A CN116516084A CN 116516084 A CN116516084 A CN 116516084A CN 202211494749 A CN202211494749 A CN 202211494749A CN 116516084 A CN116516084 A CN 116516084A
- Authority
- CN
- China
- Prior art keywords
- coal
- smelting
- theoretical
- coke
- slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003245 coal Substances 0.000 title claims abstract description 608
- 238000003723 Smelting Methods 0.000 title claims abstract description 400
- 238000000034 method Methods 0.000 title claims abstract description 244
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 600
- 229910052742 iron Inorganic materials 0.000 claims abstract description 295
- 239000002893 slag Substances 0.000 claims abstract description 281
- 239000000446 fuel Substances 0.000 claims abstract description 217
- 238000002347 injection Methods 0.000 claims abstract description 185
- 239000007924 injection Substances 0.000 claims abstract description 185
- 239000000463 material Substances 0.000 claims abstract description 180
- 238000004364 calculation method Methods 0.000 claims abstract description 165
- 238000004458 analytical method Methods 0.000 claims abstract description 56
- 239000004615 ingredient Substances 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 28
- 239000000571 coke Substances 0.000 claims description 312
- 230000008859 change Effects 0.000 claims description 131
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 115
- 239000001301 oxygen Substances 0.000 claims description 115
- 229910052760 oxygen Inorganic materials 0.000 claims description 115
- 230000008569 process Effects 0.000 claims description 99
- 230000000694 effects Effects 0.000 claims description 88
- 239000010936 titanium Substances 0.000 claims description 88
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 81
- 230000001276 controlling effect Effects 0.000 claims description 75
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 66
- GFNGCDBZVSLSFT-UHFFFAOYSA-N titanium vanadium Chemical compound [Ti].[V] GFNGCDBZVSLSFT-UHFFFAOYSA-N 0.000 claims description 63
- 229910052719 titanium Inorganic materials 0.000 claims description 57
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 54
- 239000008188 pellet Substances 0.000 claims description 53
- 230000005484 gravity Effects 0.000 claims description 48
- 238000002485 combustion reaction Methods 0.000 claims description 46
- 229910052710 silicon Inorganic materials 0.000 claims description 43
- 239000010703 silicon Substances 0.000 claims description 43
- 229910052720 vanadium Inorganic materials 0.000 claims description 41
- 229910052717 sulfur Inorganic materials 0.000 claims description 40
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 38
- 230000035699 permeability Effects 0.000 claims description 36
- 239000000203 mixture Substances 0.000 claims description 33
- 238000012937 correction Methods 0.000 claims description 32
- 229910000805 Pig iron Inorganic materials 0.000 claims description 30
- 239000012535 impurity Substances 0.000 claims description 30
- 230000001105 regulatory effect Effects 0.000 claims description 29
- 238000007664 blowing Methods 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 26
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 22
- 239000002817 coal dust Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 17
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 14
- 239000012925 reference material Substances 0.000 claims description 14
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 12
- 235000012239 silicon dioxide Nutrition 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 5
- 230000002829 reductive effect Effects 0.000 abstract description 13
- 238000011002 quantification Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000002956 ash Substances 0.000 description 98
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 91
- 238000006722 reduction reaction Methods 0.000 description 90
- 230000009467 reduction Effects 0.000 description 89
- 239000000395 magnesium oxide Substances 0.000 description 47
- 238000010079 rubber tapping Methods 0.000 description 45
- 239000000126 substance Substances 0.000 description 33
- 239000010883 coal ash Substances 0.000 description 31
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 23
- 239000011593 sulfur Substances 0.000 description 18
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 17
- 238000006477 desulfuration reaction Methods 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 16
- 238000005070 sampling Methods 0.000 description 15
- 229910052783 alkali metal Inorganic materials 0.000 description 14
- 150000001340 alkali metals Chemical class 0.000 description 14
- 230000033228 biological regulation Effects 0.000 description 13
- 238000010411 cooking Methods 0.000 description 13
- 239000011162 core material Substances 0.000 description 13
- 230000023556 desulfurization Effects 0.000 description 10
- 230000006870 function Effects 0.000 description 10
- 239000011701 zinc Substances 0.000 description 10
- 208000012826 adjustment disease Diseases 0.000 description 8
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 7
- 239000002585 base Substances 0.000 description 7
- 238000004939 coking Methods 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 7
- 230000001186 cumulative effect Effects 0.000 description 7
- 229910052725 zinc Inorganic materials 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000009897 systematic effect Effects 0.000 description 6
- 239000002864 coal component Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 230000035484 reaction time Effects 0.000 description 5
- 239000010421 standard material Substances 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 239000011824 nuclear material Substances 0.000 description 4
- 238000005245 sintering Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 229920005549 butyl rubber Polymers 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 238000012428 routine sampling Methods 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 206010063385 Intellectualisation Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- -1 lump ore Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000012800 visualization Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/04—Making slag of special composition
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2300/00—Process aspects
- C21B2300/04—Modeling of the process, e.g. for control purposes; CII
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention relates to a modularized accurate control w ([ Si ] for coal temperature control quantification]) Belongs to the technical field of blast furnace smelting. The method comprises reference ingredients, ingredient calculation, parameter and index check analysis, and accurate control of input pulverized coal injection adjustmentw([Si]) And slag iron components, smelting in a furnace, controlling parameters and the like. The invention solves the problems of material speed-coal ratio-alkalinity-theoretical fuel ratio, coordination and balance of various smelting parameters during daily smelting of the blast furnace based on the basic theory of the blast furnace and the material balance and heat balance principles of the blast furnace,w([Si]) And slag iron component control, smelting period, index prediction control and other related data are mutually influenced, and specified molten iron can be achieved through 0-3 times of coal blendingw([Si]) Value, more is ensuredw([Si]) The smelting is carried out within a specified range, so that the running degree of the furnace condition is improved, and the fuel ratio and smelting cost are obviously reduced. Has the advantages of simple methodAnd the control is quick and accurate. Meanwhile, the method is suitable for different volumes and different furnace burden structures, and has strong adaptability.
Description
Technical Field
The invention belongs to the technical field of blast furnace smelting, and relates to a blast furnace smelting method for quantitatively and modularly and accurately controlling w ([ Si ]) by using coal to regulate and control temperature.
Background
The low and stable molten iron w ([ Si ]) value is an important mark for balancing the furnace temperature and controlling the level of the blast furnace, and the blast furnace smelting process is a complicated system engineering for obtaining the low molten iron w ([ Si ]) value and improving the stable and uniform level thereof, keeping the blast furnace always stably and smoothly running and continuously improving the technical and economic indexes under specific conditions. In terms of the blast furnace operation technical method, an effective way capable of systematically, standardizing and accurately controlling (the burden blanking speed: deleting characters in brackets) the blast furnace temperature molten iron w ([ Si ])) in the blast furnace smelting process under the condition of specific raw fuel of the blast furnace with different volumes is sought, and the refining and accurate effects of daily main regulating means (oxygen enrichment amount and coal injection amount) of the blast furnace on the blast furnace operation level are timely and accurately reflected. And the requirements of the material speed and the w ([ Si ]) amount are quantitatively and modularly controlled in combination with the specific smelting parameter conditions of the specific blast furnace. Not only the matching performance of each smelting parameter is good, but also the adjustment factors can accurately reach the target value in the acting time, thereby continuously improving the stable and smooth degree of the furnace condition of the furnace and the stability of w ([ Si ]), and obtaining the smelting result which is suitable for the conditions and has better index.
In essence, a low and stable molten iron w ([ Si ]) value is obtained in the smelting process of the blast furnace, and the blast furnace has abundant physical heat, so that the two relative movements of the fall of furnace burden and the rise of gas flow in the blast furnace are characterized to obtain stable and sufficient heat and mass transfer processes, and the blast furnace has important significance for realizing stable furnace condition, quality improvement, consumption reduction, safety and long service life of the blast furnace in the daily production strengthening smelting process of the blast furnace; the level of the molten iron w ([ Si ]) reflects the hearth heat level of the blast furnace, and the stability thereof reflects the level of the heat utilization and heat consumption of the blast furnace. In addition, the control accuracy of the molten iron w ([ Si ]) value also determines the molten iron composition, quality and slag composition and performance within the range satisfying the slag alkalinity requirement (realized by combining the specified w ([ Si ]) value with the slag main composition control requirement through the comprehensive calculation of ingredients). In fact, the low and stable value of the molten iron w ([ Si ]) reflects the rationality of the distribution of the various charge zones inside the blast furnace and the economy of the reduction reaction. Therefore, the control level of the molten iron w ([ Si ]) value is the most important index for measuring the operation skill level of the blast furnace. The low-silicon stable silicon smelting is continuously carried out, the quantitative and modularized accurate control of the molten iron w ([ Si ]) value and the slag iron component is realized, and the method is the most important work task of an ironmaking operator.
The iron-making production process is a very complex system engineering, and with the progress of modern iron-making technology and the improvement of the strengthening level, the requirement on the balance of the blast furnace smelting process is more important. In daily blast furnace production, the quality components of raw fuel, the blast furnace type and the blast furnace state are not constant, and along with the change of external conditions and the progress of production strengthening smelting, the change inevitably exists, and the change is not a single-factor and linear change, but a plurality of angle, layer and mutual influence and mutual correlation complex changes exist. Therefore, the accurate control of the burden discharging speed and the molten iron w ([ Si ]) value (slag iron component) by utilizing oxygen enrichment and coal injection means in the iron-making production is a relatively complex practical operation and the forever pursuing work content of blast furnace operators. To a large extent, the control of molten iron w ([ Si ]) by conventional operating methods in the blast furnace production process is still based on operating by means of a combination of local simple calculations and experience. The defects of local calculation are that the acquisition of data is not systematic and complete, even the judgment is carried out by means of inaccurate instrument data, some calculation parameters are used as fixed values or only the data when the time is taken, the state of a specific blast furnace smelting process cannot be effectively reflected, the correlation relationship of multi-factor interaction cannot be dynamically considered in real time, and the calculation process is not uniform due to the difference of three operators. In the blast furnace production, the value of molten iron w ([ Si ]) is precisely controlled, and the fixed fluctuation interval is reduced and stabilized as much as possible, so that a more timely, comprehensive, reliable, efficient and accurate calculation method is needed, the data acquisition and the operation are convenient, and the quantitative, modeling, instantaneity and comprehensive system processing of the complex control process related calculation are needed.
At present, the blast furnace equipment technology and the raw fuel quality treatment technology are greatly improved, and the equipment reliability, the instrument sensitivity and the raw fuel quality stability are obviously improved. And with the development of computer and informatization technologies, the method is realized in a complex blast furnace smelting process, and achieves comprehensive and systematic dynamic and accurate combined calculation. Therefore, how to overcome the defect of the control technology of the existing operation method on the molten iron w ([ Si ]) is a problem to be solved in the technical field of the current blast furnace smelting.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a blast furnace smelting method for quantitatively and accurately controlling w ([ Si ]) by using coal to control temperature, which forms a quantitative modularized treatment mode for solving the mutual influence of relevant data such as coke batch-hour coal amount-hour oxygen enrichment amount-material speed-molten iron w ([ Si ]) value-slag iron component control (alkalinity and magnesium-aluminum ratio), smelting period and yield, fuel ratio index prediction control, check, coordination balance of direct (indirect) smelting parameters and the like in the daily intensified smelting process of a blast furnace according to the principle of regulating coal to quantitatively and accurately control molten iron w ([ Si ]) value based on the basic theory of the blast furnace. In order to accurately make w ([ Si ]) in the blast furnace smelting process reach a planned set value, obviously improve the smooth degree of the blast furnace condition, reduce the fuel ratio and smelting cost, the blast furnace smelting method is simple, comprehensive in system, high in applicability, rapid and accurate in control, and capable of quantitatively and modularly and accurately controlling the value of the molten iron w ([ Si ]) in the blast furnace, and effectively improving the operating technical level and the stability of the furnace condition.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a blast furnace smelting method for quantitatively and modularly and accurately controlling w ([ Si ]) by using coal control temperature comprises the following steps:
A. and (3) reference batching: the smelting is common ore smelting or medium titanium slag smelting;
when smelting for common ore, the adopted common ore burden comprises the following components in percentage by mass: 65-72% of sintered ore, 20-28% of high silicic acid pellet ore and 0-10% of low silicon lump ore; totaling 100%; 53000-55000 kg of ore batch;
when smelting medium titanium slag, the adopted vanadium titanium ore furnace burden comprises the following components in percentage by mass: 60-65% of sinter, 30-35% of vanadium-titanium pellet, 0-5% of low-silicon lump ore and 100% in total; 320000-34000 kg/batch of ore batch;
when common ore smelting or medium titanium slag smelting is carried out, coke batches are 7200-11000 kg/batch based on the dry basis of coke; the coke butyl batch is 450-700 kg/batch based on the dry basis of the coke; the pulverized coal injection amount is 21.5-48.5 t/h;
B. calculating ingredients, checking and analyzing parameters and indexes:
b1, reference ingredients calculation, parameter and index checking analysis:
the wind pressure, the wind quantity, the wind temperature and w ([ Si ] are unchanged, wherein the wind temperature is the highest stable wind temperature, and if the factor fluctuation range in common ore smelting or medium titanium slag smelting is satisfied, the clinker rate < +/-1.0%, the comprehensive charging grade < +/-0.20%, the coke ash content < +/-0.1% and the pulverized coal ash content < +/-0.10%, the following steps are:
(1) Calculating theoretical fuel ratio, utilization coefficient and smelting period;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
(3) Calculating the multiple conversion coefficient of the corrected air quantity and the meter air quantity, and the oxygen enrichment rate after correcting the air quantity is 2.90-5.00%;
and B2, calculating ingredients, checking parameters and indexes of which main checking conditions change, and analyzing:
the wind pressure, the wind quantity, the wind temperature and w ([ Si ] are unchanged, wherein the wind temperature is the highest stable wind temperature, and if any factor fluctuation range in normal ore smelting or medium titanium slag smelting does not meet the following conditions of clinker rate < +/-1.0%, comprehensive furnace-entering grade < +/-0.20%, coke ash content < +/-0.1% and pulverized coal ash content < +/-0.10%:
(1) Calculating the hour coal quantity, batch theoretical iron quantity, theoretical coal ratio, coke butadiene ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting period and coal injection rate after factor change;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
C. the adjustment amount of the input pulverized coal injection is used for precisely controlling w ([ Si ]) and the iron slag components:
performing pre-control deviation check on the specified w ([ Si ]) and the actual w ([ Si ]), and if Shan Lu times of the absolute values of the specified w ([ Si ]) and the actual w ([ Si ]) are less than 0.05 percentage points, the check result is that adjustment is not needed; otherwise, the adjustment is needed;
The adjusting method comprises the following steps:
(1) Collecting comprehensive air supply parameters, indirect smelting parameters and fuel parameters;
(2) Inputting the adjustment amount of the pulverized coal injection to adjust the coal on the basis of the original pulverized coal injection amount, so as to obtain the new hour coal amount; then calculating theoretical material speed, the influence w ([ Si ]) quantity of coal dust adjustment quantity and the estimated w ([ Si ]) quantity after adjusting the coal dust quantity according to the collected comprehensive air supply parameter, indirect smelting parameter and fuel parameter, and judging the coal adjustment effect;
the judgment conditions are as follows:
(1) After the pulverized coal adjustment amount is input, the theoretical prediction influences the fluctuation of |w ([ Si ]) to be | <0.050%;
(2)|w([Si]) it is expected that -w([Si]) Provision for provision of |<0.03％；
Specifically, when the actual w ([ Si ]) value exceeds (or is lower than) the prescribed w ([ Si ]) value by more than 0.10% under the forward running of the furnace condition, the allowable coal amount is predicted to reach w ([ Si ]) value-actual w ([ Si ]) value| < 0.10%.
If the three conditions 1) to 2) are satisfied at the same time, and after checking the difference between the actual material speed after coal adjustment and the specified reference material speed, the judgment result is that adjustment is not needed, and w ([ Si ]) control effect check is needed; simultaneously calculating theoretical combustion temperature, blast kinetic energy, air permeability index and smelting period after coal blending;
the specific method for checking the w ([ Si ]) control effect comprises the following steps:
checking w ([ Si ]), and daily theoretical indexes, wherein the definition standard is as follows: the absolute value error rate of the difference between the daily theoretical coal ratio and the daily actual coal ratio and the coke ratio is less than 1.50%; if both the two conditions are satisfied, continuing the flow;
D. Smelting and parameter control in a furnace:
in the smelting process of charging into the furnace, controlling the pulverized coal amount per hour to be less than or equal to 3 times in each shift, and controlling the molten iron |day theoretical control w ([ Si)]) Predicted value -Japanese specification w ([ Si)]) Plan value |<0.05 percentage points per day;
smelting conditions are as follows: the hot air pressure is 0.30-0.39 MPa, the top pressure is 0.155-0.195 MPa, the hot air temperature is 1150-1250 ℃, and the corrected air quantity entering the furnace is 3200-5700 m 3 Per min, the oxygen enrichment is 9400-15000 m 3 And/h, the pulverized coal injection amount is 135-165 kg/t iron, and the coal injection rate is 22.0-35.0%; 33.0 to 55.0 tons of ore batch, 7.2 to 11.0 tons of coke batch based on dry basis; the coke batch accounts for 0.45 to 0.70 ton based on dry basis; w ([ Si)]) 0.055-0.35%, slag alkalinity 1.10-1.18, molten iron temperature 1420-1480 ℃; in the smelting process, the slag ratio is 380-480 kg/t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag alkalinity is 1.10-1.18, the air temperature is controlled to be stable, the oxygen enrichment rate is 2.90-5.0%, and the air permeability is controlledGas index 18000-22000 m 3 The theoretical combustion temperature is 2300-2400 ℃, the actual blowing speed is 255-275 m/S, the actual blowing kinetic energy is 17000-22000 kg.m/S, and the theoretical hourly material speed is 8.5-10.0 batches.
Further, it is preferable that the sinter component comprises 52.0 to 54.0% TFe and 5.5 to 6.5% SiO by mass percent 2 13.0 to 13.5 percent of CaO and 1.75 to 2.19 percent of Al 2 O 3 2.30 to 2.90 percent of MgO and 0.40 to 1.35 percent of TiO 2 0.045-0.055% S, 0.165-0.150% V 2 O 5 MnO 0.045-0.055%, unavoidable impurities in balance, bulk specific gravity 1.90-2.10 t/m 3 ；
The vanadium-titanium pellet ore comprises 53.5 to 57.5 percent of TFe and 4.5 to 5.5 percent of SiO according to mass percent 2 0.55 to 1.35 percent of CaO, 2.20 to 2.90 percent of Al 2 O 3 2.35 to 2.90 percent of MgO and 6.40 to 11.0 percent of TiO 2 0.55 to 0.75 percent of V 2 O 5 0.23 to 0.25 percent of MnO and the balance of unavoidable impurities; bulk specific gravity of 2.20-2.30 t/m 3 ；
The high silicic acid pellet comprises 58.5 to 60.0 percent of TFe and 6.5 to 7.5 percent of SiO according to mass percent 2 0.5 to 1.5 percent of CaO and 1.80 to 2.10 percent of Al 2 O 3 1.0 to 1.5 percent of MgO and 2.50 to 3.50 percent of TiO 2 0.165 to 0.150 percent of V 2 O 5 MnO 0.045-0.055%, unavoidable impurities in balance, bulk density 2.15-2.35 t/m 3 ；
The low-silicon lump ore comprises 64.0 to 66.0 percent of TFe and 3.0 to 4.5 percent of SiO according to mass percent 2 0.03 to 0.05 percent of CaO, 1.00 to 1.50 percent of Al 2 O 3 MgO and TiO in 0.01-1.0 wt% 2 <V1.0%, 0.030-0.050% 2 O 5 MnO 0.110-0.160%, unavoidable impurities in balance, bulk density 2.2-2.4 t/m 3 。
Further, it is preferable that the coke component comprises, by mass, 84.0 to 86.5% of C and 13.5 to 14.5% of ashBulk specific gravity of 0.55-0.65 t/m 3 ；
The total analysis component of the coke ash comprises 53.0-56.0% of SiO by mass percent 2 2.20 to 3.0 percent of CaO and 24.0 to 26.0 percent of Al 2 O 3 MgO, tiO 0.15-1.0% 2 <2.0 percent, 0.35 to 0.45 percent of MnO, and the balance of unavoidable impurities;
the pulverized coal injection comprises, by mass, 76.0-78.0% of C, 13.5-15.0% of ash, 12.5-13.5% of volatile matters, and the particle size is 66-70% in terms of-200 meshes;
the full analysis component of the ash content of the pulverized coal injection comprises 55.0-57.0% of SiO by mass percent 2 5.20 to 6.50 percent of CaO, 23.0 to 25.0 percent of Al 2 O 3 MgO, tiO 2.20-2.50% 2 <2.0 percent, 0.35 to 0.45 percent of MnO and the balance of unavoidable impurities.
Further, it is preferable that the integrated air supply parameters include: the air quantity, humidity, wind pressure, top pressure, wind temperature and air port area are measured; the indirect smelting parameters comprise corrected air quantity, oxygen enrichment rate after the air quantity is corrected, theoretical combustion temperature, air permeability index and blast kinetic energy; the fuel parameters include the batch weight, the composition and the pre-tuyere burning rate of coke and coke butyl, and the amount of the hour pulverized coal, the composition and the pre-tuyere burning rate of the pulverized coal.
Further, the adjustment amount of the hourly coal injection amount is preferably less than 5.0% of the total hourly coal injection amount
Further, preferably, the method further comprises the step E of returning and correcting the actual smelting result: and E, according to the actual smelting result obtained in the step E, according to theoretical control and actual material speed, theoretical calculation control and actual w ([ Si ]) value, theoretical slag iron component and actual slag iron component, theoretical and actual tapping yield and theoretical and actual fuel ratio, correcting calculation parameters according to the calculation methods of the steps B-D, and continuing smelting.
According to the principle of quantitative modularized coal regulation and accurate control of a blast furnace w ([ Si ]), on the basis of comprehensive nuclear material (full analysis of raw fuel fed into the furnace) and slag iron component correction according to standard w ([ Si ]) quantity prediction, material speed influencing factors (correction air quantity, correction oxygen enrichment rate, coal ratio, coke batch and the like) and theoretical quantitative calculation and accurate control of material speed, material speed control standard correction, theoretical iron quantity and theoretical index calculation are checked; and then controlling (prescribing w ([ Si ]), actual w ([ Si ]), theoretical precontrolling w ([ Si ])) according to the definition-w ([ Si ]) of the w ([ Si ]) range after the adjustment (directly inputting the adjustment quantity) of the coal quantity, combining the basic w ([ Si ]) quantity-prescribing w ([ Si ]) quantity-actual w ([ Si ]) deviation quantity-calculating the adjustment quantity of the coal (input) -after the adjustment of the coal quantity, calculating the influence amplitude of the material speed, the w ([ Si ]) quantity and the alkalinity, controlling the material speed accurately before and after the precontrolling the molten iron w ([ Si ]) quantity to reach the standard, controlling the slag iron component precontrolling, adjusting the balance of the smelting parameters in the furnace, rechecking the index component and returning the actual smelting result to the correction step.
In the raw materials of the invention, 1-2 kinds of high silicic acid pellets can be adopted, 2 kinds of vanadium-titanium pellets can be adopted, and 2 kinds of dry coke can be adopted. When the comprehensive charging grade, clinker rate, coke ash and coal ash are changed, the proportion, coke batch, hour coal injection and indirect smelting parameters are checked according to the condition that the w ([ Si ]) amount is unchanged and the slag alkalinity is in the range. The checking comprises checking the theoretical temperature; the air quantity is full, the air temperature is the highest and stable, no adjustment is made, and the oxygen enrichment rate is 2.90-5.00% after the air quantity is corrected.
When the comprehensive charging grade, clinker rate, coke ash and pulverized coal ash change beyond the fluctuation range (range is shown below), the invention must check the ratio, coke batch and hour coal injection quantity and theoretical index according to the condition that the reference w ([ Si ]) quantity is unchanged and the slag alkalinity is in the range.
The invention combines the basic operation parameters (basic coal quantity, basic material speed and basic w ([ Si ])) under the conditions of basic raw fuel main reference parameters (clinker rate, comprehensive furnace charging grade, coke and pulverized coal ash): the standard operation parameters of the whole wind (wind pressure, wind quantity), wind temperature and w ([ Si ]) are not adjusted, the main raw fuel parameters are stable (the fluctuation range is satisfied that the clinker rate is < +/-1.0 percent, the comprehensive furnace-feeding grade is < +/-0.20 percent, the coke is < +/-0.1 percent and the ash content of the pulverized coal is < +/-0.10 percent), the standard index determining step is directly carried out,
The molten iron is given a predetermined w ([ Si ] in terms of units per batch]) Under the value condition [ Si]、[Ti]、[Mn]、[V]The equivalent element reduction rate (obtained by returning to the similar raw fuel conditions (ore and coke species) (w ([ Si)]) Si reduction ratio, w ([ Si)]) -Ti reduction ratio, w ([ Si)]) Mn reduction ratio, w ([ Si)]) V reduction rate fitting), w ([ Si ]]) -desulfurization rate fitting relation, [ S ]]The removal rate is equal to a predetermined w ([ Si)]) Fitting a polynomial relational expression, entering the corresponding element oxide and S, P, as in molten iron, entering the amount of each element oxide and S, P, as in slag, outputting slag amount (slag ratio), alkali metal, lead zinc, titanium, sulfur load and the like, theoretical slag component (comprising alkalinity, magnesium aluminum ratio and the like), and theoretical pig iron component (obtained by theoretical calculation of the corresponding element oxide in molten iron). The calculation formula related to the concept is a conventional formula (Zhou Chuandian, a technical manual for blast furnace ironmaking process production [ M ]]Beijing: beijing metallurgical industry press, 2008); relates to a slag ratio and correction air quantity calculation formula, and relates to w ([ Si) in molten iron])、w([S])、w([P])、w(Ti])、w([As])、w([V]) Calculation formula of w (Mn) and calculation formula of w (SiO) in slag 2 )、w(CaO)、w(MgO)、w(Al 2 O 3 )、w(TiO 2 )、w(V 2 O 5 ) The calculation formula of w (MnO) is disclosed. Then calculating the fitting relation (or correction multiple) of the meter air quantity and the correction air quantity
When the main reference parameters (clinker rate, comprehensive charging grade, coke ash and coal ash) of the basic raw fuel are changed beyond the stable range, the basic operation parameters are adjusted according to the change amplitude condition through the step B2 (including the determination of the basic hour coal quantity and coke batch after the raw fuel is changed): .
And (3) carrying out batch calculation, parameter and index checking analysis on the change of main checking conditions: the calculation sequence is as follows: after the factor is changed, determining the hourly coal amount, determining the theoretical iron amount of the batch, calculating the theoretical coal ratio, determining the coke ratio and the coke-to-butyl ratio, determining a new coke batch, and calculating the theoretical fuel ratio, the utilization coefficient, the smelting period and the coal injection rate of the batch under the change of basic conditions.
The related concept and calculation formula are as follows:
hourly coal quantity after factor change 2 ＝l 1 -(m h1 -m h2 )*0.015*l 1
l 2 The coal amount is kg/t of the hour after the factor changes; l (L) 1 The coal amount is kg/t in the hour before the factor changes; m is m h1 The ash content of the pulverized coal before factor change is kg/t; the method comprises the steps of carrying out a first treatment on the surface of the m is m h2 The ash content of the pulverized coal after factor change is kg/t.
Ratio of focal length after factor change
d 2 ＝(ΣTFe 1 -ΣTFe 2 )*0.02*d 1 -(S 1 -S 2 )/5*1*d 1 /100-(w([Si]) 1 -w([Si]) 2 )*0.01*d 1 -(J h1 -J h2 )*0.015*d 1 +d 1
d 2 The theoretical Jotin ratio after factor change is kg/t; d, d 1 The ratio of the coke to the butyl rubber before factor change is kg/t; sigma TFe 1 The comprehensive charging grade before factor change is kg/t; sigma TFe 2 The grade of the integrated furnace after factor change,%; s is S 1 Clinker rate before factor change,%; s is S 2 Clinker rate after factor change,%; j (J) h1 Coke ash,%; j (J) h2 As the coke ash after factor change,%.
Focal ratio after factor change
k 2 ＝(ΣTFe 1 -ΣTFe 2 )*0.02*k 1 -(S 1 -S 2 )/5*1*d 1 /100-(w([Si]) 1 -w([Si]) 2 )*0.01*d 1 -(J 1 -J 2 )*0.015*k 1 +k 1
k 2 The theoretical coke ratio is kg/t after factor change; k (k) 1 The coke ratio before factor change is kg/t; sigma TFe 1 The comprehensive charging grade before factor change is kg/t; sigma TFe 2 The grade of the integrated furnace after factor change,%; s is S 1 Clinker rate before factor change,%; s is S 2 Clinker rate after factor change,%; j (J) 1 Coke ash,%; j (J) 2 As the coke ash after factor change,%.
Factor-changed coke oven C 2 ＝(k 2 +d 2 )*t Management device /1000-J d
C 2 Determining coke batch, kg/t for the new factor change; j (J) d The dry diced coke is of constant weight, kg/t.
The batch theoretical fuel ratio, the utilization coefficient, the smelting period and the coal injection rate calculation formula are conventional formulas.
The calculated amounts are all calculated on a dry basis. The reference w ([ Si ]) is set unchanged, and the coke batch and the hour coal quantity (coke oven is unchanged) are automatically calculated and adjusted according to the formula according to the original fuel variable.
Then, the slag ratio, various loads, theoretical pig iron component, theoretical slag component, basicity, magnesium-aluminum ratio, etc. are calculated in the same manner as in step (2) of step B1.
In the smelting process, the reference w ([ Si ]) is changed frequently, and the control is carried out by combining the 'coal control w ([ Si ])'.
C. The adjustment amount of the input pulverized coal injection is used for precisely controlling w ([ Si ]) and the iron slag component
In the blast furnace smelting process, the surrounding smelting should reach the specified w ([ Si ]), the coal injection amount in the hour is regulated to accurately pre-control the w ([ Si ]), and the actual w ([ Si ]) reached after the adjustment reaction is combined for checking and analysis.
In the blast furnace smelting process, when the difference between the actual material speed and the specified reference material speed is within a certain range, pre-control deviation checking is carried out on the specified w ([ Si ]) and the actual w ([ Si ]), and the definition of the adjustment quantity of the injected pulverized coal is checked: shan Lutie times (absolute value of specified w ([ Si ]) and actual w ([ Si ])) are less than 0.05 percentage points, and the checking result shows that the coal injection amount does not need to be adjusted, and the step D1 is entered; and D2, if the check result is that the absolute value of the specified w ([ Si ]) and the actual w ([ Si ]) is more than or equal to 0.05 percentage point, the pulverized coal injection quantity is controlled in advance for the required adjustment of the hour, and the step D2 is performed.
C1, the specified and actual material speed is in the range.
The material speed difference is defined by combining the theoretical material speed and the specified material speed, the material speed difference is in a range (+ -1.0 batch/h), when |specified w ([ Si ]) -actual w ([ Si ])| <0.05% percentage points (the air quantity is full air, the air temperature is fixed, and the oxygen enrichment amount is the current amount), the method is judged as follows: the coal injection quantity is not required to be adjusted, and the next period is directly entered.
And C2, inputting the adjustment quantity of the pulverized coal to be injected, and accurately controlling w ([ Si ]).
In the smelting process (the air quantity is full air, the air temperature is fixed, the oxygen enrichment amount is the current amount), the absolute value of single furnace iron (the absolute value of the specified w ([ Si ]) and the actual w ([ Si ])) is more than or equal to 0.05 percent, and the 'hour coal quantity adjustment accurate control w ([ Si ])'. The required parameters, the method and the steps are as follows:
(1) Parameters (including calculated indirect smelting parameters and fuel parameters) which need to be collected. The comprehensive air supply parameters obtained by direct collection comprise: the surface air quantity, humidity, wind pressure, top pressure, wind temperature, air port area and the like; the indirect smelting parameters (automatic calculation) comprise corrected air quantity obtained according to a table-actual air quantity correction coefficient (or fitting polynomial), and oxygen enrichment rate, theoretical combustion temperature, air permeability index, blast kinetic energy, check and the like after correcting the air quantity. The fuel parameters that need to be collected include: the batch weight, the components and the front air port burning rate of coke and diced coke; the hourly pulverized coal amount, pulverized coal components and the tuyere front combustion rate. In addition, the real-time hour coal amount is collected in real time and automatically accumulated to the hour.
(2) And determining the adjustment amount of the pulverized coal injection and precisely controlling the amount of molten iron w ([ Si ]).
The determining step (calculating sequence) of the adjustment amount of the pulverized coal injection comprises the following steps: the method comprises the steps of (1) raw pulverized coal injection amount, (input) pulverized coal injection adjustment amount, (input) new hour coal amount, (theoretical material speed (ton coal consumption air volume obtained by combining comprehensive blast parameters and fuel parameters in the step (1), hour coal consumption air volume, ton coke consumption air volume and residual air volume after coal burning), pulverized coal adjustment amount influence w ([ Si ]) amount, (predicted w ([ Si ]) amount after pulverized coal adjustment) and coal adjustment effect judgment.
And (5) comparing the w ([ Si ]) control effect after coal adjustment (reflected 3.5 hours after coal adjustment) (Zhou Chuandian, technical manual for blast furnace ironmaking process production [ M ], beijing: beijing metallurgical industry Press, 2008): the effect is not achieved, carrying out cause analysis and error analysis, carrying out cause resolution, entering the next period, and if the cause is not resolved, stopping the flow, achieving the w ([ Si ]) control effect, and entering the next period after the steps D3 and D3.
When the control effect of w ([ Si ]) is reached, the process proceeds to step D3. And D3, entering the next period after the step D3.
The concept and formula involved in this step are:
the coal quantity is expected to affect the molten iron w ([ Si)]) Quantity w ([ Si)]) Influence quantity ＝(M Adjustment of /L Real time /(Fe pl /1000)/(J Batch of materials /Fe pl +J Batch d /Fe pl +M
Base group ))*100/10
w([Si]) Influence quantity Molten iron w ([ Si) influenced by theoretical calculation of pulverized coal injection adjustment amount]) Amount,%; m is M Adjustment of The adjustment amount of the pulverized coal is kg/h; l (L) Real time The method is a real-time theoretical material speed calculated according to parameters such as real-time corrected air quantity, oxygen enrichment rate obtained according to real-time oxygen enrichment after the air quantity is corrected, and the like, and the batch/h is calculated; fe (Fe) pl Theoretical iron yield of each batch of ore, kg/t; j (J) Batch of materials Kg/batch for each batch of coke dry basis; j (J) Batch d For each dry basis of the coke breeze, kg/batch,%. M is M Base group The ratio of the coal is kg/t. Note that: m is M Adjustment of Specific requirements for any input value (integer multiple of 100) are met.
Wherein:
real-time theoretical material speed L Real time ＝(V School and school *60-V mh )*f Wind power /V C /(J Batch of materials +J Batch d )*1000
L Real time The theoretical material speed is calculated according to the real-time oxygen enrichment amount and the corrected air quantity, and the batch/h is calculated; v (V) School and school M for the air volume after correcting the surface air volume value 3 /min；V mh The hour coal consumption air quantity, m, obtained by calculating the real-time correction air quantity and oxygen enrichment rate 3 /h；f Wind power Wind utilization rate,%; v (V) C To correct the ton coke consumption air quantity (the ton coke consumption air quantity after the oxygen enrichment rate is obtained by using the real-time oxygen enrichment amount) after the air quantity is corrected, m 3 /t；J Batch of materials Kg/batch for each batch of coke dry basis; j (J) Batch d For each dry basis of the coke breeze, kg/batch,%.
Correcting air volume V School and school ＝((J Real world *1000*J C real /100*φ C /100+J d real *1000*J dC solid /100*Φ JDC )+(M Real world *1000*M C real
/100*Φ MC ))*0.9333/(0.21+0.29*f h2O /8/100+0.79*f O2 /100)/24/60
V School and school M for the air volume after correcting the surface air volume value 3 /min；J Real world Dry basis, t, is daily consumption of coke used in the present period; j (J) C real The carbon content of the coke used in the present period,%; phi C The combustion rate of coke before a tuyere is shown as percent; j (J) d real The dry basis, t, is consumed for the day of the current-period use of the diced coke; j (J) dC solid The carbon content of the coke used in the present period,%; phi JDC The burning rate of the coke butyl before the tuyere is%; m is M Real world The daily dry basis weight, t, of the pulverized coal injection used in the present period is consumed; m is M C real The carbon content of the pulverized coal used in the present period is percent; phi MC The combustion rate of the pulverized coal before the tuyere is%; f (f) h2O Is atmospheric humidity, g/m 3 ；f O2 Oxygen enrichment rate calculated for the table air volume,%. And (3) injection: the coke amount (daily consumption) comes from the actual value over a period of time in the past (over the past two months) under similar raw fuel conditions. Oxygen enrichment rate F after correcting air quantity O2 ＝0.785*V O2 /60/(V School and school +V O2 /60)*100
F O2 To calculate the oxygen enrichment rate,%; v (V) O2 To the oxygen enrichment in the present period, m 3 And/h. The rest are the same as above. Ton coal consumption air volume V after correcting air volume m ＝1000*M C real /100/24*22.4/(0.21+0.29*f h2O /100+0.79*F O2 /100)*Φ MC V m To correct ton coal consumption air quantity after air quantity, m 3 T; the rest are the same as above;
the hour coal consumption air volume V after the oxygen enrichment rate is corrected mh ＝V m *m h /1000
V mh To correct the hour coal consumption air quantity after the oxygen enrichment rate, m 3 /h；m h The coal amount is the hour, kg/t; the rest are the same as above.
Ton coke consumption after correcting air quantityQuantity V C ＝1000*J C real /100/24*22.4/(0.21+0.29*f h2O /100+0.79*F O2 /100)*Φ C
V C To correct the ton coke consumption air quantity after the air quantity, m 3 T; the rest are the same as above.
And similarly, obtaining the corrected air quantity, the theoretical combustion temperature, the blasting kinetic energy, the air permeability index and the like after correcting the oxygen enrichment rate (the corrected air quantity is brought into a conventional calculation formula).
Batch theoretical iron content Fe pl For routine calculation, M Base group Is the selected reference coal ratio t.
Coal quantity adjusting predicted molten iron w ([ Si)]) The quantity is expected to reach the value w ([ Si) ]) It is expected that ＝w([Si]) Actual practice is that of +w([Si]) Influence quantity
w([Si]) It is expected that The molten iron w ([ Si) which is expected to be achieved after pulverized coal injection adjustment]) Amount,%; w ([ Si)]) Actual practice is that of In order to adjust the actual molten iron w ([ Si) discharged from the furnace after the reaction of the pulverized coal injection amount]) Amount,%; w ([ Si)]) Influence quantity Molten iron w ([ Si) influenced by theoretical calculation of pulverized coal injection adjustment amount]) The amount, the sign of which is determined by increasing or decreasing the coal injection amount (increasing the coal injection amount is "+" sign, decreasing the coal injection amount is "-").
The method and standard for regulating the injection quantity of the pulverized coal are defined.
Further, for tapping w ([ Si)]) Actual practice is that of The determination and check of the values of (according to routine sampling analysis of normal furnace tapping, the reaction result time of the time adjustment quantity falls into the tapping time (according to the inputted tapping time, the computer is set to automatically find the falling time function)). The method is defined as that the coke batch weight adjustment effect reflection time is a smelting period (calculated as routine calculation), the pulverized coal injection adjustment effect reflection time is 3.5 hours, and the oxygen enrichment amount adjustment effect reflection time is 1.0 hour) (Zhou Chuandian, the production technical manual of blast furnace ironmaking process [ M ]]Beijing: beijing metallurgical industry press 2008) according to the data collected per hour (the accumulated data of data quantity per minute). The pulverized coal injection amount is not repeatedly adjusted for an hour before the pulverized coal adjustment amount is unreacted.
Furthermore, the input hour coal quantity adjustment quantity reaches the requirement, and error check is carried out according to the theoretical fuel ratio obtained after coal adjustment and the planned required fuel ratio, so that the next period is entered within the range.
In particular, when the furnace condition is smooth and the theoretical material speed is different from the actual material speed by (absolute value) >1.0 batch/h (more or less), the adjustment amount of the injected coal powder is input based on the theoretical coal ratio (after the calculation formula is shown), and at the moment, the adjustment amount of the coal powder can exceed 5.0% of the original total coal amount, and the calculation method of w ([ Si ]) is influenced.
C3, predicting and pre-controlling slag iron components after adjusting and blowing coal powder to accurately control w ([ Si ]) and checking the effect of adjusting coal quantity to accurately control w ([ Si ])
(1) The iron slag component is obtained and checked by using the obtained pre-control w ([ Si ]) value.
From the above, w ([ Si ] is estimated after the input hour pulverized coal amount reaches the reaction period]) It is expected that The values were added to the values obtained above (fitting relation obtained in step B) (w ([ Si)]) Si reduction ratio, w ([ Si)]) -Ti reduction ratio, w ([ Si)]) Mn reduction ratio, w ([ Si)]) V reduction Rate, w ([ Si)]) In the fitting relation of the desulfurization rate, w ([ Si) in the furnace molten iron is obtained])、w([S])、w([P])、w(Ti])、w([As])、w([V]) Theoretical calculated values such as w (Mn); further, w (SiO) in the furnace slag is obtained 2 )、w(CaO)、w(MgO)、w(Al 2 O 3 )、w(TiO 2 )、w(V 2 O 5 ) Theoretical calculation values of w (MnO) and the like (step (1) in B1).
Further, the obtained iron slag composition was checked: will pre-control w ([ Si)]) It is expected that Values and other w ([ S)])、w([P])、w(Ti])、w([As])、w([V]) Sampling, analyzing, comparing and checking pig iron components such as w (Mn) and the like with a conventional method of tapping a sample in a corresponding time (the end of a coal adjustment reaction period); will pre-control w ([ Si)]) It is expected that Under the value condition, w (SiO) in other slag is obtained 2 )、w(CaO)、w(MgO)、w(Al 2 O 3 )、w(TiO 2 )、w(V 2 O 5 ) The slag components such as w (MnO) and the like are compared and checked by sampling analysis and comparison by a conventional method of slag sample tapping in corresponding time (focusing and coal adjusting reaction period is finished) (the method refers to the comparison of predicted chemical components and chemical components of sampling testFor (2).
(1) Checking the daily w ([ Si ]) and daily theoretical index
And comparing and checking the daily average w ([ Si ]) value, the daily theoretical coal ratio, the coke ratio and the daily actual coal ratio and the daily theoretical yield and the daily actual yield which are obtained by calculating according to the theoretical material speed. The concept, calculation method and formula of the theoretical yield and theoretical index are as follows:
theoretical yield (calculated in terms of tapping time duration and interval) t Iron tapping theory ＝Σ(ROUND((time The furnace is finished -time End of charging into furnace )*24,3)*L Real time *O Material batch /1000*ΣTFe/100*0.99/0.94)
t Iron tapping theory The accumulated theoretical iron quantity, t/d, is calculated according to the interval time of tapping of each heat in a natural day; time of The furnace is finished Calendar operation time for the furnace, h: min; time of End of charging into furnace Calendar operation time for last heat, h: min; l (L) Real time The theoretical material speed is calculated according to the real-time oxygen enrichment and corrected air quantity, and the batch/h is calculated; o (O) Material batch The weight of the ore material is kg/h; Σtfe is the integrated charge grade,%.
Theoretical yield (theoretical iron output according to hour feed rate) t Lower cooking ＝AVERAGE(L Real time *24*O Material batch /1000*ΣTFe/100*0.99/0.94)
t Iron tapping theory The average value of daily output, t/d, is obtained according to the hour theoretical iron amount obtained by correcting the air quantity and the oxygen enrichment rate per hour; the rest are the same as above. The daily theoretical iron output is obtained by accumulating the hour to the day.
Theoretical fuel ratio (theoretical iron output per hour) theoretical calculation of K Lower cooking ＝C Dry coke batch *L Real time *24/t Lower cooking +M Coal injection in an hour *24/t Lower cooking
K Lower cooking An hour theoretical fuel ratio kg/t obtained from an hour theoretical iron amount obtained by correcting the air quantity and the oxygen enrichment rate per hour; m is M Coal injection in an hour The coal injection amount is kg/h in real time; the rest are the same as above.
The operating results during operation reflect theoretical fuel ratio fluctuations within + -5 kg/t.
D. According to the previous steps (preliminary checking of blast furnace conditions, focusing and batch (containing coke butyl), oxygen and material adjustment, coal and temperature adjustment), the adjusted raw fuel and smelting parameters are fed into a furnace, and smelting parameter adjustment is controlled: the method comprises the steps of precisely controlling the material speed, precisely controlling the w ([ Si ]) (the molten iron w ([ Si ])) value, controlling and calculating the iron slag component, performing index real-time theoretical prediction and pre-control, defining conditions of each step flow to meet requirements and within an error range, smelting according to the material sequence, and adjusting related variable main operation parameters such as coke (coke-containing butadiene) batch weight, oxygen enrichment, hour coal amount and the like according to the definition of main parameter change values of raw fuel conditions, smelting parameter adjustment, action time and the like in the process. The method has the advantages of real-time theoretical material speed calculation, slag iron component, yield and index prediction and control of molten iron w ([ Si ]), and comparison checking and return re-correction calculation templates according to actual smelting tapping yield, slag iron component, coking coal ratio and iron quantity.
Smelting in a furnace and controlling parameters:
d1, feeding the total of the four ores A to a blast furnace according to the conventional amount, wherein the total of the four ores A is 100 percent (the ores comprise vanadium titanium ore and common ore), and the coke with higher ash content and sulfur content (containing coke butyl); after checking the state of the blast furnace, under the condition of constant air temperature and full air, the quantitative coal-regulating is adopted to accurately control the molten iron w ([ Si)]) The value of the pulverized coal amount per hour of each shift is less than or equal to 3 times, and the theoretical control w ([ Si ] of molten iron |day is realized]) Predicted value -Japanese specification w ([ Si)]) Plan value |<0.05 percentage points per day.
D2, smelting under the following conditions:
the method is suitable for blast furnace smelting including titanium slag smelting in vanadium titanium ore and common ore, and the parameter smelting range is as follows: the hot air pressure is 0.30-0.39 MPa, the jacking pressure is 0.155-0.195 MPa, the hot air temperature is 1150-1250 ℃, and the air quantity (after correction) of the furnace inlet is 3200-5700 m 3 Per min, the oxygen enrichment is 9400-15000 m 3 The coal dust injection amount is 135-165 kg/t iron (the coal injection rate is 22.0-35.0%); 33.0 to 55.0 tons of ore batch, 7.2 to 11.0 tons of coke batch (dry basis); 0.45-0.70 ton of diced coke (dry basis); w ([ Si)])0.055 to 0.35 percent (lower limit of vanadium titanium ore smelting), 1.10 to 1.18 percent of slag alkalinity and 1380 to 1480 ℃ of molten iron temperature.
Adjustment of coke batch: when the raw fuel conditions (4 main components) are input (collected) to reach the required adjustment range (defining the requirement, see step A), the calculation is performed according to the rules, formulas and methods (automation is easy to realize). The effect of this adjustment reflects a time of 1 smelting cycle.
(controlling the adjustment amount of the coal injection amount at the time of molten iron w ([ Si ])) hours: when the difference between the actual w ([ Si ]) value of the molten iron and the planned w ([ Si ]) value reaches the required adjustment range (defining the requirement see step A), the calculation is performed according to the rules, formulas and methods (automation is easy to realize). The adjustment amount of the coal injection amount per hour is less than 5.0% of the total coal injection amount per hour, and the effect reflection time of the adjustment is 3.5 hours.
The falling time reflected by the adjusting effect is automatically found to be the function solution.
The effect completion time of the above influencing factors is respectively as follows: the charging grade, the slag alkalinity, the clinker rate and the top pressure are all one smelting period (4.5-5.5 hours, automatic calculation), the pulverized coal is injected for 3.5 hours, and the air quantity, the air temperature and the humidity are 1 hour. The adjusting node changes corresponding influence factors and the acting time of the adjusting factors is consistent, so that the relative stability of the comprehensive fuel ratio is maintained (the absolute value of deviation is <5 kg/t).
D3, smelting under the following conditions:
in the smelting process, the slag ratio is 380-480 kg/t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag alkalinity is 1.10-1.18, the air temperature is controlled to be stable (any value within the range of 1180-1250 ℃), the oxygen enrichment rate (after correcting the air quantity) is 2.90-5.0%, and the air permeability index is 18000-22000 m 3 The theoretical combustion temperature is 2300-2400 ℃, the actual blowing speed is 255-275 m/S, the actual blowing kinetic energy (after air quantity correction) is 17000-22000 kg.m/S, and the theoretical hour material speed is 8.5-10.0 batches.
When oxygen control material and coal control temperature, except that the obtained deviation value accords with the deviation requirement range of the material speed and silicon, the air quantity, the air pressure, the top pressure and other direct smelting parameters are automatically calculated to obtain the air permeability index, the theoretical combustion temperature and the air blastThe kinetic energy and other indirect smelting parameters are all within the range. Vanadium titanium ore smelting blast furnace w ([ Si)]) Lower limit of the value, w (MgO)/w (Al) 2 O 3 ) The value takes the upper limit.
And returning the actual smelting result to correct. And (3) conventionally deslagging and tapping (the tapping frequency of the vanadium titanium ore smelting is increased by 2-3 times per day compared with that of a blast furnace for common ore smelting), and returning correction calculation parameters according to the hour theory and actual material speed, the theoretical calculation control and actual w ([ Si ]) value, the theoretical slag iron component and actual slag iron component, the theoretical and actual tapping yield (day), the theoretical and actual fuel ratio and the like.
In the invention, the common ore burden comprises the following components: 53000-55000 kg/batch of ore batch, which comprises sintered ore, common high silicic acid oxidizing pellet ore and low silicon lump ore; the vanadium titanium ore furnace burden comprises the following components: the ore batch is 320000-34000 kg/batch, and is composed of sintered ore, high vanadium titanium pellet and high silicon lump ore. The method comprises the steps of carrying out reference check on burden proportions, coke batches, hourly coal blending amounts, smelting indexes and indirect smelting parameters after the comprehensive charging grade, clinker rate, coke ash and pulverized coal ash are changed, carrying out reference burden calculation, parameter and reference table check analysis, carrying out burden calculation, parameter and index check analysis on main check conditions (the clinker rate, the comprehensive charging grade and the coke pulverized coal ash) are changed, carrying out oxygen regulation control actual material speed, inputting injection pulverized coal adjustment amount to accurately control w ([ Si ]) and slag iron components and effect check, carrying out primary check on the conditions of a blast furnace, focusing batches (containing coke butyl), oxygen regulation and control materials, regulating coal temperature) according to the previous steps, charging smelting parameters, controlling smelting parameter adjustment and returning actual smelting results to a correction check process, and accurately controlling the blast furnace molten iron w ([ Si ]) and slag iron components by adopting a method of accurately controlling the blast furnace by a modularized coal regulation and easy to realize automatic acquisition of related data and comprehensive summation, and accurately achieving the stable and stable injection of the blast furnace molten iron in the daily operation smelting after 0-3 hours adjustment of the injection amount is carried out: the I prescribes w ([ Si ]) -the actual w ([ Si ])| <0.05 percentage points, and the possibility of reverse operation is avoided. In addition, the method also has the functions of real-time prediction of theoretical and actual yield, theoretical and actual fuel ratio and the like of the regulation effect, comparison and check of daily actual values and check of smelting parameters, and is easy to realize the functions of automatic data acquisition, calculation and analysis.
In the step A, after the comprehensive charging grade, clinker rate, coke ash and pulverized coal ash change beyond the fluctuation range (range is shown below), the ratio, the coke batch and the hour coal injection amount and theoretical indexes are checked according to the condition that the reference w ([ Si ]) amount is unchanged and the slag alkalinity is in the range.
In the step B (B1), the fluctuation range of the main raw fuel parameters satisfies the following conditions: clinker rate<1.0 percent of comprehensive charging grade<0.20 percent of coke<0.1% of pulverized coal ash<(+ -0.10%) and directly outputting slag iron components according to the calculation sequence of the step B1, wherein the slag iron components are specifically as follows: according to the reference smelting parameters (w ([ Si)]) The air quantity, the air pressure, the hour coal quantity, the hour actual material speed and the like, and the theoretical alkalinity fluctuation is maintained according to the input of common ore and schreyerite smelting types<0.01(±)、w(TiO 2 )<17.0％、w(Al 2 O 3 )<13.0%, magnesium-aluminum ratio 0.65-0.95 (upper limit is adopted in vanadium titanium ore smelting) and the like (the target is automatically calculated after specific raw fuel components and a furnace burden proportioning structure are input, the calculated result meets the range), and on the basis of furnace burden proportions (3 bins of sinter, 2 bins of vanadium titanium pellets and 1 bin of lump ore) of the iron ore, theoretical calculation and check are carried out on furnace burden charging grade, theoretical iron amount, smelting period, slag amount, fuel ratio, coal injection rate, slag iron components and the like, and slag iron components, slag ratio, potassium sodium, zinc and titanium loads are output; wherein: titanium slag smelting in vanadium titanium ore (w (TiO) 2 ) The similar raw fuel conditions (ore and coke breeds) in the range of 10.0% -17.0%) are characterized by Si reduction rates<3.0% Ti reduction rate<5.5%; mn reduction ratio<55%, V reduction rate<70%, S removal rate>85%); smelting common ores: si reduction ratio<5.0% Ti reduction rate<20.0%; mn reduction ratio<80%, V reduction rate<80%, S removal rate>93.0％)。
In the step B (B2), if the main raw fuel parameter exceeds the stable range, the reference operation parameter needs to be adjusted according to the change amplitude condition (including the determination of the reference hour coal amount and the coke batch after the raw fuel is changed). And checking indirect smelting parameters such as proportioning, coking batch, hour coal injection amount, smelting period and the like according to the standard ore batch, coking batch (dry basis), w ([ Si ]) amount, unchanged air temperature and slag alkalinity within a range. The steps and the calculation sequence are as follows: after the factor is changed, determining the hourly coal amount, determining the theoretical iron amount of the batch, calculating the theoretical coal ratio, determining the coke ratio and the coke-to-butyl ratio, determining a new coke batch, and calculating the theoretical fuel ratio, the utilization coefficient, the smelting period, the coal injection rate and the like of the batch under the change of basic conditions. The calculation formulas (see the foregoing detailed description, and the calculation formulas of the theoretical fuel ratio, the utilization coefficient, the smelting period and the coal injection rate of the batch are conventional formulas) relate to the hour coal amount after the factor change, the coke oven ratio after the factor change, the coke oven after the factor change (the coke oven is kept unchanged) and the like. Then, the step (2) of the step B1 is carried out again to calculate the slag ratio, various loads, slag iron components and the like. The principle is as follows: the coke batch is only adjusted according to the comprehensive charging grade, clinker ratio and ash content change of coke coal dust; the change of w ([ Si ]) value does not adjust the coke batch, and is mainly controlled by coal adjustment, when the coal ratio is continuously lower than the specified value 2 furnaces in the smelting process, the coke batch is adjusted after the difference value of the raw coal ratio (compared with the current coal ratio) is reduced. In particular: the change factor becomes good (clinker rate, comprehensive charging grade increases, coke ash and coal ash decrease), and the change trend direction obtained by input calculation is as follows: maintaining smelting parameters such as full air quantity, oxygen quantity, fixed air temperature and the like, and reducing the coal injection quantity and the coal ratio in the hour; the coke batch increases and the coke ratio decreases. The smelting period is prolonged. And the variation trend of variation factor variation (clinker rate, comprehensive furnace-entering grade decrease, coke ash and pulverized coal ash increase) is opposite.
The clinker rate, the furnace charging grade, the coke ash, the coal dust ash value and the like after maintaining the theoretical slag alkalinity range can realize data on-line acquisition and automatic calculation (real-time and accumulation); the calculation of the material speed is obtained by automatically calculating smelting parameters such as the changed ore batch, the changed coke batch and the analysis of each component, the combination of the quantity and the air quantity, the oxygen quantity, the air temperature and the like.
In the step C, the input pulverized coal injection adjustment quantity is involved to accurately control w ([ Si)]) And (5) slag iron components and checking. In the blast furnace smelting process, the specific W ([ Si)]) And the actual w ([ Si)]) And (5) performing pre-control deviation checking to serve as a basis for adjusting the coal injection quantity. Checking pulverized coal injection adjustmentThe definition of the whole is: shan Lutie times (prescribe w ([ Si)]) And the actual w ([ Si)]) Absolute value of difference between two<0.05 percent without adjusting the coal injection quantity; the check result was defined as w ([ Si)]) And the actual w ([ Si)]) And (3) if the absolute value of the difference is more than or equal to 0.05 percentage point, entering the step C2. Comprising the following steps: the collected parameters (including the calculated indirect smelting parameters and fuel parameters) of the step (1) and the determination of the adjustment amount of the pulverized coal injection of the step (2) and the accurate control of the molten iron w ([ Si)]) Amount of the components. The determining step (calculating sequence) of the adjustment amount of the pulverized coal injection in the step (2) is as follows: original pulverized coal injection amount- & gtpulverized coal injection adjustment amount (input) & gtpulverized coal injection amount- & gtnew hour coal amount- & gttheoretical material speed (ton coal consumption air volume obtained by combining comprehensive air blowing parameters and fuel parameters in step (1), hour coal consumption air volume, ton coke consumption air volume, residual air volume after coal burning) and- & gtpulverized coal adjustment amount influence w ([ Si) ]) Amount→estimated w ([ Si ] after adjusting pulverized coal amount]) And judging the coal blending effect. Wherein: the defining standard of the pulverized coal injection amount in the adjustment hour is as follows: the adjustment amount (kg/h) of coal injection is input at random (the adjustment amount is not more than 5.0% of the total coal injection amount in the original hour) for a period of time until the reacted molten iron is obtained, and w ([ Si)]) The quantity is expected to reach the value w ([ Si)]) It is expected that The result reaches (judging principle of coal adjusting effect) at the same time: (1) Theoretical predicted influence of coal quantity |w ([ Si)]) Quantity |<0.050% (increase or decrease); (2) After the coal amount is regulated, the value w ([ Si ] is predicted to be reached by I regulation]) It is expected that -w([Si]) Provision for provision of |<0.03%. In particular, the actual w ([ Si) is in the forward motion of the furnace conditions]) The value exceeds (or falls below) the prescribed w ([ Si)])>When the percentage is 0.10, the coal blending quantity is allowed to reach the estimated value of w ([ Si)]) Value-actual w ([ Si)]) Value |<0.10％。
The control effect of w ([ Si ]) after coal blending (3.5 hours after coal blending) was compared (Zhou Chuandian, technical manual for blast furnace iron-making process production [ M ], beijing: beijing metallurgical industry Press, 2008): the effect is not achieved, the reason analysis and the error analysis are carried out, the reason is solved, and the next period is entered; the reason cannot be solved, and the flow stops. And (3) when the control effect of w ([ Si ]) is achieved, the step C3 is entered. And C3, entering the next period after the step C3.
Tapping w ([ Si)]) Actual practice is that of The value checking principle (according to routine sampling analysis of normal furnace tapping, when the quantity is regulated to react to the result)The time falls into the tapping time (according to the input tapping time, the computer sets the function of automatically searching for the falling iron times). Defined as: the coke batch weight adjustment effect reflection time is one smelting period (calculated as conventional calculation); the adjusting effect reflecting time of the pulverized coal injection is 3.5 hours; the effect reflection time of adjusting the oxygen enrichment is 1.0 h). The reaction time of the oxygen enrichment is 1 hour ((Zhou Chuandian, technical manual for blast furnace ironmaking process production [ M ])]Beijing: beijing metallurgical industry press, 2008)) according to the data collected per hour (cumulative amount of data amount per minute).
The input hour coal quantity adjustment quantity reaches the requirement, and the next period is entered according to the difference error < +/-5.0 kg/t between the theoretical fuel ratio output obtained after coal adjustment and the planned required fuel ratio.
(in particular, when the furnace condition is smooth and the theoretical material speed is different from the actual material speed by (absolute value) >1.0 batch/h (more or less), the adjustment amount of the injected coal powder is input based on the theoretical coal ratio (after the calculation formula is shown), and at the moment, the adjustment amount of the coal powder can exceed 3.0% of the original total coal amount, and the calculation method of w ([ Si ]) is influenced by the same way.
The concepts and formulas involved in step C include: the coal quantity is expected to affect the molten iron w ([ Si)]) Quantity w ([ Si)]) Influence quantity Real-time theoretical material speed L Real time Correcting the air volume V School and school Oxygen enrichment F after correcting air quantity O2 Ton coal consumption air volume V after correcting air volume m Ton coke consumption air volume V after correcting air volume C Molten iron w ([ Si) is estimated by coal blending amount]) The quantity is expected to reach the value w ([ Si)]) It is expected that And the calculation formula (the correction air quantity and the theoretical combustion temperature, the blast kinetic energy, the air permeability index and the like after the correction of the oxygen enrichment rate are related to the conventional formulas in detail).
The step C (C2) involves the accurate control of w ([ Si) for the adjustment of the pulverized coal injection]) The predicted control of the slag iron component is that the input hour coal powder amount reaches the predicted w ([ Si ] after the reaction period]) It is expected that The values were incorporated into the values obtained above (w ([ Si)]) Si reduction ratio, w ([ Si)]) -Ti reduction ratio, w ([ Si)]) Mn reduction ratio, w ([ Si)]) V reduction Rate, w ([ Si)]) In the fitting relation of desulfurization rate, w ([ Si)]) It is expected that Slag iron formation at the valueA score; the step C (C3) involves (1) accurate control of the coal amount w ([ Si)]) Checking each component of the slag iron with the effect; (2) w ([ Si)]) Checking the daily theoretical index. The definition criteria are: daily theoretical coal ratio, coke ratio, daily actual coal ratio, absolute value error rate of difference between the two <1.50% and the operating results during operation reflect theoretical fuel ratio fluctuations within + -5 kg/t. And the actual daily iron output is compared, namely the theoretical daily iron output is compared with the actual daily iron output. The concepts and formulas involved include: theoretical yield (calculated in terms of tapping time duration and interval) t Iron tapping theory Theoretical yield (theoretical iron output in terms of hours) t Lower cooking Theoretical fuel ratio (iron output according to hour theory) theoretical calculation K Lower cooking 。
Step D, feeding the sum of the four ores A to a blast furnace according to the conventional amount, wherein the sum of the four ores A is 100 percent (the ores comprise vanadium titanium ore and common ore), and the coke with higher ash content and sulfur content (containing coke butyl); after checking the state of the blast furnace, the quantitative coal-regulating and precise control of molten iron w ([ Si ] under the conditions of fixed air temperature, full air temperature and oxygen-regulating and material-controlling speed is adopted]) The value of the pulverized coal amount per hour of each shift is less than or equal to 3 times, and the theoretical control w ([ Si ] of molten iron |day is realized]) Predicted value -Japanese specification w ([ Si)]) Plan value |<0.05 percentage points per day. Wherein: adjustment of coke batch: when the raw fuel condition reaches the required adjustment range (defining the requirement, see step A), the calculation is performed according to the rules, formulas and methods (automation is easy to realize). The effect of this adjustment reflects a time of 1 smelting cycle.
(controlling the adjustment amount of the coal injection amount at the time of molten iron w ([ Si ])) hours: when the difference between the actual w ([ Si ]) value of the molten iron and the planned w ([ Si ]) value reaches the required adjustment range (defining the requirement see step A), the calculation is performed according to the rules, formulas and methods (automation is easy to realize). The adjustment amount of the coal injection amount per hour is less than 5.0% of the original total amount, and the effect reflection time of the adjustment is 3.5 hours.
The falling time reflected by the adjusting effect is automatically found to be functional solution according to the adjusting time and the reaction period of the specific adjusting factors.
In the smelting processWhen the oxygen regulating material and the coal regulate the temperature, except that the obtained deviation value accords with the range of the material speed and the silicon deviation requirement, the air quantity, the air pressure, the top pressure and other direct smelting parameters and the air permeability index, the theoretical combustion temperature, the blast kinetic energy and other indirect smelting parameters obtained by automatic calculation are all in the range. Vanadium titanium ore smelting blast furnace w ([ Si)]) Lower limit of the value, w (MgO)/w (Al) 2 O 3 ) The value takes the upper limit.
The invention meets the smelting requirement of quantitative modularized accurate control of w ([ Si ]) in the blast furnace smelting process, and in the steps D1-D3 and E, the blast furnace smelting is carried out by inputting the accurate control of the coal quantity adjustment w ([ Si ]) value of the hour under the conditions of constant air temperature, full air quantity and oxygen regulation and control material, and the smelting is completed by comparing and returning the corrected calculation parameters according to theoretical control and actual material speed, theoretical calculation control and actual w ([ Si ]) value, theoretical slag iron component and actual slag iron component, theoretical and actual tapping yield (daily), theoretical and actual fuel ratio and the like.
Based on the basic principle of material balance and heat balance of the blast furnace, when the material speed, the w ([ Si ]) (molten iron w ([ Si ])) and the specified value deviate in the normal smelting (including normal ore and vanadium ore smelting) process of the blast furnace under the conditions of certain smelting intensity and technical indexes, the invention forms a quantitative modularized treatment mode which can effectively solve the complex relationship of the relative data of coke batch-hour coal amount-hour oxygen enrichment amount-material speed-molten iron w ([ Si ]) value-slag iron component control (alkalinity and magnesium-aluminum ratio) during the daily enhanced smelting of the blast furnace, the smelting period and yield, the fuel ratio index prediction control, the check and the direct (indirect) smelting parameter coordination balance. The material speed and the w ([ Si ]) quantity in the smelting process can reach the planned and preset values accurately, and the continuous correction function is realized.
The invention relates to a quantitative and modularized accurate control method for blast furnace temperature (molten iron w ([ Si)]) Value) to achieve an increase in stability of the furnace conditions and a decrease in the furnace hot metal w ([ Si)]) The value and the production stability of the blast furnace are improved, and the smelting method for stabilizing the technical and economic indexes is continuously improved. In particular to a positive electrode for a blast furnace Furnace temperature in the normal-strength smelting process (molten iron w ([ Si)]) Value) and a specified value, and based on a blast furnace basic theory, accurately controlling molten iron w ([ Si) according to the' oxygen regulation and material control + coal regulation quantitative modularization]) The principle of value' solves the problems of coke batch-hour coal quantity-hour oxygen enrichment quantity-material speed-molten iron w ([ Si) during daily intensified smelting of the blast furnace]) And (3) value-slag iron component control (alkalinity and magnesium-aluminum ratio), smelting period and yield, fuel ratio index prediction control, checking, direct (indirect) smelting parameter coordination balance and other related data are subjected to quantitative modularized treatment. Accurately lead w ([ Si) in the smelting process]) The quantity reaches a planned preset value; what is more, let the actual w ([ Si)]) A significant increase in the ratio (delta) within the specified range w([Si]) The value is obviously reduced), not only improves the smooth running degree of the blast furnace condition, but also obviously reduces the fuel ratio and smelting cost. And the realization process of the method can realize automatic acquisition and calculation based on data, and has the characteristics of simple method, rapid control and accuracy. Meanwhile, the method is suitable for blast furnaces with any volume and any furnace burden structure (including vanadium-titanium ore smelting and common smelting), and can achieve the purpose of regulating coal by 0-3 in each operation shift to reach the specified molten iron w ([ Si) ]) Values. The smelting method effectively improves the systematic and accurate operation level of the blast furnace, improves the stability of the furnace condition of the blast furnace and continuously improves the technical index level. Has wide practicability and adaptability.
The invention is based on a smelting basic theory, and combines operation practice experience to systematically master the performance characteristics of raw fuel, the smelting production characteristics of a blast furnace, the influence of each smelting parameter on the smelting process, and the matching and process control association relation of related smelting parameters, and develop a quantitative modularized treatment technical method capable of solving the mutual influence of related data such as coke batch-hour coal amount-hour oxygen enrichment amount-material speed-molten iron w ([ Si ]) value-slag iron component control (alkalinity and magnesium-aluminum ratio), smelting period and yield, fuel ratio index prediction control, check, direct (indirect) smelting parameter coordination balance and the like in the daily enhanced smelting process of the blast furnace. In the operation, the oxygen-enriched amount and the coal injection amount are utilized to carry out quantification and modularized adjustment, so that the material speed and the w ([ Si ]) amount in the smelting process accurately reach the planned set values in the reaction period, the balance stability of the blast furnace production is obviously improved, the forward running degree of the blast furnace condition is improved, and the fuel ratio and the smelting cost are obviously reduced. And, the method should have wide applicability and adaptability. This has important practical significance in production practice.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to the data, quantification and modularization of charging ingredients and index prediction check, smelting parameters and check, oxygen and material adjustment and coal adjustment precise control w ([ Si ]) (molten iron w ([ Si ]) value) (core module), iron (day) value (adjustment factor reflects the heat, day) and slag iron component pre-control and check, daily output and index tracking pre-control and check change and the like in the smelting operation process with complicated and strong correlation. And has the advantages of comprehensiveness, timeliness, system and accuracy. The realization is as follows: the specified molten iron w ([ Si ]) value can be achieved by mixing coal for 0-3 times in each operation shift, the systematic and accurate operation level of the blast furnace is effectively improved, the stability of the furnace condition of the blast furnace is improved, and the technical index level is continuously improved. Meanwhile, the method is suitable for blast furnaces with any volume and any furnace burden structure (including vanadium-titanium ore smelting and common smelting). The application method is simple, and the realization process of the method can realize automatic acquisition and calculation (including acquisition and correction of coke batch, hour oxygen enrichment, hour coal injection and related direct smelting parameters) based on the required data, and the adjustment of the reflected time and the comparison and check of the actual effect in the corresponding time according to the respective factors. In practical application, only the regulating quantity (the regulating quantity of the hour coal injection quantity) is input according to the method provided by the invention, and the complex and error-prone multi-element simultaneous equation solution can be replaced by combining the obtained (acquired) corresponding variables (such as raw fuel components, burden structure proportion, regulating factor action and reaction period, direct smelting parameters and the like), so that the required effect can be directly output, and the real-time tracking, comparison and check of regulating effect prediction can be realized. The influence trend, amplitude and control requirement of various factors on the blast furnace burden speed, w ([ Si ]) (molten iron w ([ Si ])) and slag iron component pre-control in the smelting process are fully reflected in the calculation process. The quantitative and modularized accurate control of the hour feed rate and the blast furnace w ([ Si ]) value during blast furnace smelting are satisfied, so as to achieve the requirements of improving the stability of the furnace conditions of the blast furnace, reducing the value of the blast furnace molten iron w ([ Si ]) and improving the stability of w ([ Si ]) and continuously improving the change trend, the suitability and the matching property of smelting parameters of stable technical and economic indexes. Particularly, when the material speed and the value w ([ Si ]) (molten iron w ([ Si ])) of the blast furnace deviate from a specified value in a normal enhanced smelting process, based on a basic theory of the blast furnace, a quantitative modularized treatment mode for solving the mutual influence of related data such as coke batch-hour coal amount-hour oxygen enrichment amount-material speed-molten iron w ([ Si ]) value-slag iron component control (alkalinity and magnesium-aluminum ratio), smelting period and yield, fuel ratio index prediction control, check, coordination balance of direct (indirect) smelting parameters and the like in the daily enhanced smelting of the blast furnace is obtained according to the principle of' coal adjustment quantification modularization and accurate control of the molten iron w ([ Si ]). The method has the advantages of simple method and accurate control.
The invention is used for the blast furnace in normal enhanced smelting (common ore and vanadium titanium ore smelting), when the material speed and the value of w ([ Si ]) (molten iron w ([ Si ])) deviate from a specified value in the smelting process, or the fluctuation of w ([ Si ]) is required to be further reduced, the material speed and the value of w ([ Si ]) of the blast furnace are precisely controlled so as to achieve the purposes of improving the stability of the furnace condition and reducing the consumption; in particular, the requirement of continuously increasing the operation level of a blast furnace operator under different raw fuel and equipment conditions of a specific blast furnace is met, and the method is used for replacing the traditional method of operating by relying on the experience of the blast furnace operator for a long time or combining partial simple calculation to obtain the approximate adjustment quantity. The quantitative and modularized dispensing method is established by the principle of 'coal-adjusting quantitative modularized precise control of molten iron w ([ Si ]) value', the influence of multiple correlation factors is dynamically and real-timely considered, the defect of non-uniformity caused by capability quality difference of three operators in the calculation process is overcome, and the complex control process correlation calculation is quantitatively, modeled, instantaneity and comprehensive system processing by means of a computer, so that the method is realized: the specified molten iron w ([ Si ]) value can be achieved by mixing coal for 0-3 times in each operation shift, the systematic and accurate operation level of the blast furnace is effectively improved, the stability of the furnace condition of the blast furnace is improved, and the technical index level is continuously improved. Meanwhile, the method is suitable for blast furnaces with any volume and any furnace burden structure (including vanadium-titanium ore smelting and common smelting).
Compared with the traditional thought and mode which depend on operation experience, field estimation, local simple calculation or multi-simultaneous equation set calculation and the traditional calculation and method for controlling materials and temperatures, the invention develops a modularized treatment technology which can solve the problems of quantitative modularized adjustment of coke batch in the daily enhanced smelting process of the blast furnace, namely the quantitative modularized adjustment of the coal quantity in hours, the control of the material speed in hours, the control of the molten iron w ([ Si ]) value (the specified w ([ Si ]) value, the estimated achievement of the w ([ Si ]) value after coal adjustment, the actual w ([ Si ]) value), the control of the slag iron component (alkalinity, magnesium-aluminum ratio), the smelting period and yield (the theoretical yield according to the theoretical material speed, the theoretical yield according to the material speed in the tapping time, the actual yield), the fuel ratio (the theoretical and the actual) index prediction control, the calibration, the coordination of each direct (indirect) smelting parameter and other relevant data influence each other. In the operation, the oxygen-enriched amount and the coal injection amount are utilized to carry out quantification and modularized adjustment, so that the w ([ Si ]) amount in the smelting process can accurately reach the planned preset value in the reaction period, and the device has the functions of checking and returning correction by comparing indexes such as the adjustment effect (the material speed, the molten iron w ([ Si ]) value and the theoretical calculated value and the calculated value of the slag iron component) and the yield, the fuel ratio and the like in an hour, a furnace number and a day. In the operation, the indexes such as the material speed, the w ([ Si ]) value, the slag iron component, the yield fuel ratio and the like can be accurately known only by knowing the actual raw fuel component and the smelting parameter, so that the problems of incomplete information quantity, consideration of no system, larger errors of local calculation and the like in the traditional method are solved; the problem that three-shift operation adjustment standard and calculation method are not uniform easily caused by the fact that an operator generally adjusts the speed only by means of personal level and experience in the traditional operation is solved; the method solves the defects that the traditional method considers insufficient variable quantity and does not have instantaneity; solves the problems that the traditional method can not combine the actual smelting parameter change and the accuracy of the calculated result in the adjustment of the oxygen enrichment amount, the coal injection amount, the material speed and the control of the blast furnace w ([ Si ]); the method solves the problems that the traditional method is excessively long in calculation time, parameter adjustment (coke batch, oxygen enrichment amount and coal injection amount) cannot achieve the smelting systematicness, the new method is combined with actual change to achieve real-time calculation, comprehensive and systematic dynamic and accurate combined calculation of the complex control process association calculation in the complex blast furnace smelting process is achieved, quantification and modeling are achieved on operation, the output result is timely achieved, the problems that the material speed-coal ratio-alkalinity-theoretical fuel ratio during the daily smelting of the blast furnace, the coordination balance of each smelting parameter, w ([ Si ]) and associated data such as slag iron component control, smelting period and index prediction control are mutually influenced are solved, the specified molten iron w ([ Si ]) value can be achieved through 0-3 times of coal adjustment, more, the fact that w ([ Si ]) is kept in a specified range is guaranteed, the forward running degree of the furnace condition is improved, and the fuel ratio and smelting cost are remarkably reduced are solved. In addition, the method realizes automatic acquisition and calculation based on data, directly (indirectly) correlates smelting parameters in real time, is easy to realize automation, intellectualization and visualization, is not limited by the size of the volume of the blast furnace and the smelting ore types (smelting of titanium slag in common ore and vanadium titanium ore), is a novel blast furnace smelting technical method which can be widely applied, can automatically combine smelting parameters such as the surface air quantity, the oxygen enrichment quantity and the like by simply inputting the regulating quantity (the pulverized coal injection quantity) and provides omnibearing and instant operation support for blast furnace operators, and has the characteristics of simple method, quick and accurate control.
Drawings
FIG. 1 is a flow chart of checking the components of raw fuel and iron slag in the method of the invention;
FIG. 2 is a flow chart of the method of the invention for accurately controlling the molten iron w ([ Si ]) and checking the slag iron components and theoretical indexes;
FIG. 3 is a graph showing the fit of w ([ Si ]) values to [ Si ] reduction rates;
FIG. 4 is a graph showing the fit of w ([ Si ]) values to [ Ti ] reduction rates;
FIG. 5 is a graph showing the fit of w ([ Si ]) values to [ Mn ] reduction rates;
FIG. 6 is a graph showing the fit of w ([ Si ]) values to [ V ] reduction rates;
FIG. 7 is a graph showing the fit relationship between w ([ Si ]) and desulfurization rate;
FIG. 8 is a graph showing the fit of w ([ Si ]) values to [ Si ] reduction rates;
FIG. 9 is a graph showing the fit of w ([ Si ]) values to [ Ti ] reduction rates;
FIG. 10 is a graph showing the fit of w ([ Si ]) values to [ Mn ] reduction rates;
FIG. 11 is a graph showing the fit of w ([ Si ]) values to [ V ] reduction rates;
FIG. 12 shows a fitting relationship between w ([ Si ]) and desulfurization rate.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the present invention and should not be construed as limiting the scope of the invention. The specific techniques or conditions are not identified in the examples and are performed according to techniques or conditions described in the literature in this field or according to the product specifications. The materials or equipment used are conventional products available from commercial sources, not identified to the manufacturer.
Example 1
A blast furnace smelting method for quantitatively and modularly and accurately controlling w ([ Si ]) by using coal control temperature comprises the following steps:
A. and (3) reference batching: the smelting is common ore smelting or medium titanium slag smelting;
when smelting for common ore, the adopted common ore burden comprises the following components in percentage by mass: 71% of sintered ore, 20% of high silicic acid pellet and 9% of low silicon lump ore; totaling 100%; 54000kg of ore batch;
when smelting medium titanium slag, the adopted vanadium titanium ore furnace burden comprises the following components in percentage by mass: 65% of sintered ore, 30% of vanadium-titanium pellet ore, 5% of low-silicon lump ore and 100% in total; batch 33000 kg/batch;
when common ore smelting or medium titanium slag smelting is carried out, the coke batch is 10000 kg/batch based on the dry basis of coke; the coke butyl batch is 600 kg/batch based on the dry basis of the coke; the pulverized coal injection amount is 21.5-48.5 t/h;
B. calculating ingredients, checking and analyzing parameters and indexes:
b1, reference ingredients calculation, parameter and index checking analysis:
the wind pressure, the wind quantity, the wind temperature and w ([ Si ] are unchanged, wherein the wind temperature is the highest stable wind temperature, and if the factor fluctuation range in common ore smelting or medium titanium slag smelting is satisfied, the clinker rate < +/-1.0%, the comprehensive charging grade < +/-0.20%, the coke ash content < +/-0.1% and the pulverized coal ash content < +/-0.10%, the following steps are:
(1) Calculating theoretical fuel ratio, utilization coefficient and smelting period;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
(3) Calculating the multiple conversion coefficient of the corrected air quantity and the meter air quantity, and the oxygen enrichment rate after correcting the air quantity is 2.90-5.00%;
and B2, calculating ingredients, checking parameters and indexes of which main checking conditions change, and analyzing:
the wind pressure, the wind quantity, the wind temperature and w ([ Si ] are unchanged, wherein the wind temperature is the highest stable wind temperature, and if any factor fluctuation range in normal ore smelting or medium titanium slag smelting does not meet the following conditions of clinker rate < +/-1.0%, comprehensive furnace-entering grade < +/-0.20%, coke ash content < +/-0.1% and pulverized coal ash content < +/-0.10%:
(1) Calculating the hour coal quantity, batch theoretical iron quantity, theoretical coal ratio, coke butadiene ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting period and coal injection rate after factor change;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
C. the adjustment amount of the input pulverized coal injection is used for precisely controlling w ([ Si ]) and the iron slag components:
performing pre-control deviation check on the specified w ([ Si ]) and the actual w ([ Si ]), and if Shan Lu times of the absolute values of the specified w ([ Si ]) and the actual w ([ Si ]) are less than 0.05 percentage points, the check result is that adjustment is not needed; otherwise, the adjustment is needed;
The adjusting method comprises the following steps:
(1) Collecting comprehensive air supply parameters, indirect smelting parameters and fuel parameters;
(2) Inputting the adjustment amount of the pulverized coal injection to adjust the coal on the basis of the original pulverized coal injection amount, so as to obtain the new hour coal amount; then calculating theoretical material speed, the influence w ([ Si ]) quantity of coal dust adjustment quantity and the estimated w ([ Si ]) quantity after adjusting the coal dust quantity according to the collected comprehensive air supply parameter, indirect smelting parameter and fuel parameter, and judging the coal adjustment effect;
the judgment conditions are as follows:
(1) After the pulverized coal adjustment amount is input, the theoretical prediction influences the fluctuation of |w ([ Si ]) to be | <0.050%;
(2)|w([Si]) it is expected that -w([Si]) Provision for provision of |<0.03％；
If the three conditions 1) to 2) are satisfied at the same time, and after checking the difference between the actual material speed after coal adjustment and the specified reference material speed, the judgment result is that adjustment is not needed, and w ([ Si ]) control effect check is needed; simultaneously calculating theoretical combustion temperature, blast kinetic energy, air permeability index and smelting period after coal blending;
if the three conditions 1) to 2) are satisfied at the same time, and after checking the difference between the actual material speed after coal adjustment and the specified reference material speed, the judgment result is that adjustment is not needed, and w ([ Si ]) control effect check is needed; simultaneously calculating theoretical combustion temperature, blast kinetic energy, air permeability index and smelting period after coal blending;
The specific method for checking the w ([ Si ]) control effect comprises the following steps:
checking w ([ Si ]), and daily theoretical indexes, wherein the definition standard is as follows: the absolute value error rate of the difference between the daily theoretical coal ratio and the daily actual coal ratio and the coke ratio is less than 1.50%; if both the two conditions are satisfied, continuing the flow;
D. smelting and parameter control in a furnace:
in the smelting process of charging into the furnace, controlling the pulverized coal amount per hour to be less than or equal to 3 times in each shift, and controlling the molten iron |day theoretical control w ([ Si)]) Predicted value -Japanese specification w ([ Si)]) Plan value |<0.05 percentage points per day;
smelting conditions are as follows: the hot air pressure is 0.30-0.39 MPa, the top pressure is 0.155-0.195 MPa, the hot air temperature is 1150-1250 ℃, and the corrected air quantity entering the furnace is 3200-5700 m 3 Per min, the oxygen enrichment is 9400-15000 m 3 And/h, the pulverized coal injection amount is 135-165 kg/t iron, and the coal injection rate is 22.0-35.0%; 33.0 to 55.0 tons of ore batch, 7.2 to 11.0 tons of coke batch based on dry basis; the diced coke is based on dry basis0.45-0.70 ton; w ([ Si)]) 0.055-0.35%, slag alkalinity 1.10-1.18, molten iron temperature 1420-1480 ℃; in the smelting process, the slag ratio is 380-480 kg/t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag alkalinity is 1.10-1.18, the controlled air temperature is stable, the oxygen enrichment rate is 2.90-5.0%, and the air permeability index is 18000-22000 m 3 The theoretical combustion temperature is 2300-2400 ℃, the actual blowing speed is 255-275 m/S, the actual blowing kinetic energy is 17000-22000 kg.m/S, and the theoretical hourly material speed is 8.5-10.0 batches.
Example 2
A blast furnace smelting method for quantitatively and modularly and accurately controlling w ([ Si ]) by using coal control temperature comprises the following steps:
A. and (3) reference batching: the smelting is common ore smelting or medium titanium slag smelting;
when smelting for common ore, the adopted common ore burden comprises the following components in percentage by mass: 72% of sintered ore, 28% of high silicic acid pellet ore and 0% of low silicon lump ore; totaling 100%; 53000kg of ore batch;
when smelting medium titanium slag, the adopted vanadium titanium ore furnace burden comprises the following components in percentage by mass: 62% of sinter, 33% of vanadium-titanium pellet, 5% of low-silicon lump ore and 100% in total; 320000 kg/batch of mineral batch;
when common ore smelting or medium titanium slag smelting is carried out, the coke batch is 7200 kg/batch based on the dry basis of coke; the coke butyl batch is 450 kg/batch based on the dry basis of the coke; the pulverized coal injection amount is 21.5-48.5 t/h;
B. calculating ingredients, checking and analyzing parameters and indexes:
b1, reference ingredients calculation, parameter and index checking analysis:
the wind pressure, the wind quantity, the wind temperature and w ([ Si ] are unchanged, wherein the wind temperature is the highest stable wind temperature, and if the factor fluctuation range in common ore smelting or medium titanium slag smelting is satisfied, the clinker rate < +/-1.0%, the comprehensive charging grade < +/-0.20%, the coke ash content < +/-0.1% and the pulverized coal ash content < +/-0.10%, the following steps are:
(1) Calculating theoretical fuel ratio, utilization coefficient and smelting period;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
(3) Calculating the multiple conversion coefficient of the corrected air quantity and the meter air quantity, and the oxygen enrichment rate after correcting the air quantity is 2.90-5.00%;
and B2, calculating ingredients, checking parameters and indexes of which main checking conditions change, and analyzing:
the wind pressure, the wind quantity, the wind temperature and w ([ Si ] are unchanged, wherein the wind temperature is the highest stable wind temperature, and if any factor fluctuation range in normal ore smelting or medium titanium slag smelting does not meet the following conditions of clinker rate < +/-1.0%, comprehensive furnace-entering grade < +/-0.20%, coke ash content < +/-0.1% and pulverized coal ash content < +/-0.10%:
(1) Calculating the hour coal quantity, batch theoretical iron quantity, theoretical coal ratio, coke butadiene ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting period and coal injection rate after factor change;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
C. the adjustment amount of the input pulverized coal injection is used for precisely controlling w ([ Si ]) and the iron slag components:
performing pre-control deviation check on the specified w ([ Si ]) and the actual w ([ Si ]), and if Shan Lu times of the absolute values of the specified w ([ Si ]) and the actual w ([ Si ]) are less than 0.05 percentage points, the check result is that adjustment is not needed; otherwise, the adjustment is needed;
The adjusting method comprises the following steps:
(1) Collecting comprehensive air supply parameters, indirect smelting parameters and fuel parameters;
(2) Inputting the adjustment amount of the pulverized coal injection to adjust the coal on the basis of the original pulverized coal injection amount, so as to obtain the new hour coal amount; then calculating theoretical material speed, the influence w ([ Si ]) quantity of coal dust adjustment quantity and the estimated w ([ Si ]) quantity after adjusting the coal dust quantity according to the collected comprehensive air supply parameter, indirect smelting parameter and fuel parameter, and judging the coal adjustment effect;
the judgment conditions are as follows:
(1) After the pulverized coal adjustment amount is input, the theoretical prediction influences the fluctuation of |w ([ Si ]) to be | <0.050%;
(2)|w([Si]) it is expected that -w([Si]) Provision for provision of |<0.03％；
Specifically, when the actual w ([ Si ]) value exceeds (or is lower than) the prescribed w ([ Si ]) value by more than 0.10% under the forward running of the furnace condition, the allowable coal amount is predicted to reach w ([ Si ]) value-actual w ([ Si ]) value| < 0.10%.
If the three conditions 1) to 2) are satisfied at the same time, and after checking the difference between the actual material speed after coal adjustment and the specified reference material speed, the judgment result is that adjustment is not needed, and w ([ Si ]) control effect check is needed; simultaneously calculating theoretical combustion temperature, blast kinetic energy, air permeability index and smelting period after coal blending;
the specific method for checking the w ([ Si ]) control effect comprises the following steps:
checking w ([ Si ]), and daily theoretical indexes, wherein the definition standard is as follows: the absolute value error rate of the difference between the daily theoretical coal ratio and the daily actual coal ratio and the coke ratio is less than 1.50%; if both the two conditions are satisfied, continuing the flow;
D. Smelting and parameter control in a furnace:
in the smelting process of charging into the furnace, controlling the pulverized coal amount per hour to be less than or equal to 3 times in each shift, and controlling the molten iron |day theoretical control w ([ Si)]) Predicted value -Japanese specification w ([ Si)]) Plan value |<0.05 percentage points per day;
smelting conditions are as follows: the hot air pressure is 0.30-0.39 MPa, the top pressure is 0.155-0.195 MPa, the hot air temperature is 1150-1250 ℃, and the corrected air quantity entering the furnace is 3200-5700 m 3 Per min, the oxygen enrichment is 9400-15000 m 3 And/h, the pulverized coal injection amount is 135-165 kg/t iron, and the coal injection rate is 22.0-35.0%; 33.0 to 55.0 tons of ore batch, 7.2 to 11.0 tons of coke batch based on dry basis; the coke batch accounts for 0.45 to 0.70 ton based on dry basis; w ([ Si)]) 0.055-0.35%, slag alkalinity 1.10-1.18, molten iron temperature 1420-1480 ℃; in the smelting process, the slag ratio is 380-480 kg/t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag alkalinity is 1.10-1.18, the controlled air temperature is stable, the oxygen enrichment rate is 2.90-5.0%, and the air permeability index is 18000-22000 m 3 The theoretical combustion temperature is 2300-2400 ℃, the actual blowing speed is 255-275 m/S, the actual blowing kinetic energy is 17000-22000 kg.m/S, and the theoretical hourly material speed is 8.5-10.0 batches.
The ingredients of the sintering ore are according to qualityComprises TFe 52.0-54.0%, siO 5.5-6.5% 2 13.0 to 13.5 percent of CaO and 1.75 to 2.19 percent of Al 2 O 3 2.30 to 2.90 percent of MgO and 0.40 to 1.35 percent of TiO 2 0.045-0.055% S, 0.165-0.150% V 2 O 5 MnO 0.045-0.055%, unavoidable impurities in balance, bulk specific gravity 1.90-2.10 t/m 3 ；
The vanadium-titanium pellet ore comprises 53.5 to 57.5 percent of TFe and 4.5 to 5.5 percent of SiO according to mass percent 2 0.55 to 1.35 percent of CaO, 2.20 to 2.90 percent of Al 2 O 3 2.35 to 2.90 percent of MgO and 6.40 to 11.0 percent of TiO 2 0.55 to 0.75 percent of V 2 O 5 0.23 to 0.25 percent of MnO and the balance of unavoidable impurities; bulk specific gravity of 2.2-2.3 t/m 3 ；
The high silicic acid pellet comprises 58.5 to 60.0 percent of TFe and 6.5 to 7.5 percent of SiO according to mass percent 2 0.5 to 1.5 percent of CaO and 1.80 to 2.10 percent of Al 2 O 3 1.0 to 1.5 percent of MgO and 2.50 to 3.50 percent of TiO 2 0.165 to 0.150 percent of V 2 O 5 MnO 0.045-0.055%, unavoidable impurities in balance, bulk density 2.15-2.35 t/m 3 ；
The low-silicon lump ore comprises 64.0 to 66.0 percent of TFe and 3.0 to 4.5 percent of SiO according to mass percent 2 0.03 to 0.05 percent of CaO, 1.00 to 1.50 percent of Al 2 O 3 MgO and TiO in 0.01-1.0 wt% 2 <V1.0%, 0.030-0.050% 2 O 5 MnO 0.110-0.160%, unavoidable impurities in balance, bulk density 2.2-2.4 t/m 3 。
The coke component comprises 84.0-86.5% of C, 13.5-14.5% of ash, and the bulk specific gravity is 0.55-0.65 t/m 3 ；
The total analysis component of the coke ash comprises 53.0-56.0% of SiO by mass percent 2 2.20 to 3.0 percent of CaO and 24.0 to 26.0 percent of Al 2 O 3 MgO, tiO 0.15-1.0% 2 <2.0 percent, 0.35 percent to 0.45 percent of MnOThe balance being unavoidable impurities;
the pulverized coal injection comprises, by mass, 76.0-78.0% of C, 13.5-15.0% of ash, 12.5-13.5% of volatile matters, and the particle size is 66-70% in terms of-200 meshes;
the full analysis component of the ash content of the pulverized coal injection comprises 55.0-57.0% of SiO by mass percent 2 5.20 to 6.50 percent of CaO, 23.0 to 25.0 percent of Al 2 O 3 MgO, tiO 2.20-2.50% 2 <2.0 percent, 0.35 to 0.45 percent of MnO and the balance of unavoidable impurities.
The comprehensive air supply parameters comprise: the air quantity, humidity, wind pressure, top pressure, wind temperature and air port area are measured; the indirect smelting parameters comprise corrected air quantity, oxygen enrichment rate after the air quantity is corrected, theoretical combustion temperature, air permeability index and blast kinetic energy; the fuel parameters include the batch weight, the composition and the pre-tuyere burning rate of coke and coke butyl, and the amount of the hour pulverized coal, the composition and the pre-tuyere burning rate of the pulverized coal.
The adjustment amount of the hour coal injection amount is less than 5.0 percent of the total amount of the original hour coal injection
And E, returning and correcting the actual smelting result: and E, according to the actual smelting result obtained in the step E, according to theoretical control and actual material speed, theoretical calculation control and actual w ([ Si ]) value, theoretical slag iron component and actual slag iron component, theoretical and actual tapping yield and theoretical and actual fuel ratio, correcting calculation parameters according to the calculation methods of the steps B-D, and continuing smelting.
Example 3
A blast furnace smelting method for quantitatively and modularly and accurately controlling w ([ Si ]) by using coal control temperature comprises the following steps:
A. and (3) reference batching: the smelting is common ore smelting or medium titanium slag smelting;
when smelting for common ore, the adopted common ore burden comprises the following components in percentage by mass: 65% of sintered ore, 25% of high silicic acid pellet and 10% of low silicon lump ore; totaling 100%; 55000kg of mineral batch;
when smelting medium titanium slag, the adopted vanadium titanium ore furnace burden comprises the following components in percentage by mass: 65% of sintered ore, 35% of vanadium-titanium pellet ore, 0% of low-silicon lump ore and 100% in total; 34000 kg/batch of ore batch;
when common ore smelting or medium titanium slag smelting is carried out, the coke batch is 11000 kg/batch based on the dry basis of coke; the coke butyl batch is 700 kg/batch based on the dry basis of the coke; the pulverized coal injection amount is 21.5-48.5 t/h;
B. Calculating ingredients, checking and analyzing parameters and indexes:
b1, reference ingredients calculation, parameter and index checking analysis:
the wind pressure, the wind quantity, the wind temperature and w ([ Si ] are unchanged, wherein the wind temperature is the highest stable wind temperature, and if the factor fluctuation range in common ore smelting or medium titanium slag smelting is satisfied, the clinker rate < +/-1.0%, the comprehensive charging grade < +/-0.20%, the coke ash content < +/-0.1% and the pulverized coal ash content < +/-0.10%, the following steps are:
(1) Calculating theoretical fuel ratio, utilization coefficient and smelting period;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
(3) Calculating the multiple conversion coefficient of the corrected air quantity and the meter air quantity, and the oxygen enrichment rate after correcting the air quantity is 2.90-5.00%;
and B2, calculating ingredients, checking parameters and indexes of which main checking conditions change, and analyzing:
the wind pressure, the wind quantity, the wind temperature and w ([ Si ] are unchanged, wherein the wind temperature is the highest stable wind temperature, and if any factor fluctuation range in normal ore smelting or medium titanium slag smelting does not meet the following conditions of clinker rate < +/-1.0%, comprehensive furnace-entering grade < +/-0.20%, coke ash content < +/-0.1% and pulverized coal ash content < +/-0.10%:
(1) Calculating the hour coal quantity, batch theoretical iron quantity, theoretical coal ratio, coke butadiene ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting period and coal injection rate after factor change;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
C. the adjustment amount of the input pulverized coal injection is used for precisely controlling w ([ Si ]) and the iron slag components:
performing pre-control deviation check on the specified w ([ Si ]) and the actual w ([ Si ]), and if Shan Lu times of the absolute values of the specified w ([ Si ]) and the actual w ([ Si ]) are less than 0.05 percentage points, the check result is that adjustment is not needed; otherwise, the adjustment is needed;
the adjusting method comprises the following steps:
(1) Collecting comprehensive air supply parameters, indirect smelting parameters and fuel parameters;
(2) Inputting the adjustment amount of the pulverized coal injection to adjust the coal on the basis of the original pulverized coal injection amount, so as to obtain the new hour coal amount; then calculating theoretical material speed, the influence w ([ Si ]) quantity of coal dust adjustment quantity and the estimated w ([ Si ]) quantity after adjusting the coal dust quantity according to the collected comprehensive air supply parameter, indirect smelting parameter and fuel parameter, and judging the coal adjustment effect;
the judgment conditions are as follows:
(1) After the pulverized coal adjustment amount is input, the theoretical prediction influences the fluctuation of |w ([ Si ]) to be | <0.050%;
(2)|w([Si]) it is expected that -w([Si]) Provision for provision of |<0.03％；
Specifically, when the actual w ([ Si ]) value exceeds (or is lower than) the prescribed w ([ Si ]) value by more than 0.10% under the forward running of the furnace condition, the allowable coal amount is predicted to reach w ([ Si ]) value-actual w ([ Si ]) value| < 0.10%.
If the three conditions 1) to 2) are satisfied at the same time, and after checking the difference between the actual material speed after coal adjustment and the specified reference material speed, the judgment result is that adjustment is not needed, and w ([ Si ]) control effect check is needed; simultaneously calculating theoretical combustion temperature, blast kinetic energy, air permeability index and smelting period after coal blending;
The specific method for checking the w ([ Si ]) control effect comprises the following steps:
checking w ([ Si ]), and daily theoretical indexes, wherein the definition standard is as follows: the absolute value error rate of the difference between the daily theoretical coal ratio and the daily actual coal ratio and the coke ratio is less than 1.50%; if both the two conditions are satisfied, continuing the flow;
D. smelting and parameter control in a furnace:
in the smelting process of charging into the furnace, controlling the pulverized coal amount per hour to be less than or equal to 3 times in each shift, and controlling the molten iron |day theoretical control w ([ Si)]) Predicted value -Japanese specification w ([ Si)]) Plan value |<0.05 percentage points per day;
smelting conditions are as follows: the hot air pressure is 0.30-0.39 MPa, the top pressure is 0.155-0.195 MPa, the hot air temperature is 1150-1250 ℃, and the corrected air quantity entering the furnace is 3200-5700 m 3 Per min, the oxygen enrichment is 9400-15000 m 3 And/h, the pulverized coal injection amount is 135-165 kg/t iron, and the coal injection rate is 22.0-35.0%; 33.0 to 55.0 tons of ore batch, 7.2 to 11.0 tons of coke batch based on dry basis; the coke batch accounts for 0.45 to 0.70 ton based on dry basis; w ([ Si)]) 0.055-0.35%, slag alkalinity 1.10-1.18, molten iron temperature 1420-1480 ℃; in the smelting process, the slag ratio is 380-480 kg/t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag alkalinity is 1.10-1.18, the controlled air temperature is stable, the oxygen enrichment rate is 2.90-5.0%, and the air permeability index is 18000-22000 m 3 The theoretical combustion temperature is 2300-2400 ℃, the actual blowing speed is 255-275 m/S, the actual blowing kinetic energy is 17000-22000 kg.m/S, and the theoretical hourly material speed is 8.5-10.0 batches.
The sinter comprises 52.0-54.0% TFe and 5.5-6.5% SiO by mass percent 2 13.0 to 13.5 percent of CaO and 1.75 to 2.19 percent of Al 2 O 3 2.30 to 2.90 percent of MgO and 0.40 to 1.35 percent of TiO 2 0.045-0.055% S, 0.165-0.150% V 2 O 5 MnO 0.045-0.055%, unavoidable impurities in balance, bulk specific gravity 1.90-2.10 t/m 3 ；
The vanadium-titanium pellet ore comprises 53.5 to 57.5 percent of TFe and 4.5 to 5.5 percent of SiO according to mass percent 2 0.55 to 1.35 percent of CaO, 2.20 to 2.90 percent of Al 2 O 3 2.35 to 2.90 percent of MgO and 6.40 to 11.0 percent of TiO 2 0.55 to 0.75 percent of V 2 O 5 0.23 to 0.25 percent of MnO and the balance of unavoidable impurities; bulk specific gravity of 2.2-2.3 t/m 3 ；
The high silicic acid pellet comprises 58.5 to 60.0 percent of TFe and 6.5 to 7.5 percent of SiO according to mass percent 2 0.5 to 1.5 percent of CaO and 1.80 to 2.10 percent of Al 2 O 3 1.0 to 1.5 percent of MgO and 2.50 to 3.50 percent of TiO 2 ，0.165～0.150% V 2 O 5 MnO 0.045-0.055%, unavoidable impurities in balance, bulk density 2.15-2.35 t/m 3 ；
The low-silicon lump ore comprises 64.0 to 66.0 percent of TFe and 3.0 to 4.5 percent of SiO according to mass percent 2 0.03 to 0.05 percent of CaO, 1.00 to 1.50 percent of Al 2 O 3 MgO and TiO in 0.01-1.0 wt% 2 <V1.0%, 0.030-0.050% 2 O 5 MnO 0.110-0.160%, unavoidable impurities in balance, bulk density 2.2-2.4 t/m 3 。
The coke component comprises 84.0-86.5% of C, 13.5-14.5% of ash, and the bulk specific gravity is 0.55-0.65 t/m 3 ；
The total analysis component of the coke ash comprises 53.0-56.0% of SiO by mass percent 2 2.20 to 3.0 percent of CaO and 24.0 to 26.0 percent of Al 2 O 3 MgO, tiO 0.15-1.0% 2 <2.0 percent, 0.35 to 0.45 percent of MnO, and the balance of unavoidable impurities;
the pulverized coal injection comprises, by mass, 76.0-78.0% of C, 13.5-15.0% of ash, 12.5-13.5% of volatile matters, and the particle size is 66-70% in terms of-200 meshes;
the full analysis component of the ash content of the pulverized coal injection comprises 55.0-57.0% of SiO by mass percent 2 5.20 to 6.50 percent of CaO, 23.0 to 25.0 percent of Al 2 O 3 MgO, tiO 2.20-2.50% 2 <2.0 percent, 0.35 to 0.45 percent of MnO and the balance of unavoidable impurities.
The comprehensive air supply parameters comprise: the air quantity, humidity, wind pressure, top pressure, wind temperature and air port area are measured; the indirect smelting parameters comprise corrected air quantity, oxygen enrichment rate after the air quantity is corrected, theoretical combustion temperature, air permeability index and blast kinetic energy; the fuel parameters include the batch weight, the composition and the pre-tuyere burning rate of coke and coke butyl, and the amount of the hour pulverized coal, the composition and the pre-tuyere burning rate of the pulverized coal.
The adjustment amount of the hour coal injection amount is less than 5.0 percent of the total amount of the original hour coal injection
And E, returning and correcting the actual smelting result: and E, according to the actual smelting result obtained in the step E, according to theoretical control and actual material speed, theoretical calculation control and actual w ([ Si ]) value, theoretical slag iron component and actual slag iron component, theoretical and actual tapping yield and theoretical and actual fuel ratio, correcting calculation parameters according to the calculation methods of the steps B-D, and continuing smelting.
Example 4
A blast furnace smelting method for quantitatively and modularly and accurately controlling w ([ Si ]) by using coal control temperature comprises the following steps:
A. and (3) reference batching: the smelting is common ore smelting or medium titanium slag smelting;
when smelting for common ore, the adopted common ore burden comprises the following components in percentage by mass: 71% of sintered ore, 20% of high silicic acid pellet and 9% of low silicon lump ore; totaling 100%; 54000kg of ore batch;
when smelting medium titanium slag, the adopted vanadium titanium ore furnace burden comprises the following components in percentage by mass: 60% of sinter, 35% of vanadium-titanium pellet, 0% of low-silicon lump ore and 100% in total; batch 33000 kg/batch;
when common ore smelting or medium titanium slag smelting is carried out, the coke batch is 10000 kg/batch based on the dry basis of coke; the coke butyl batch is 600 kg/batch based on the dry basis of the coke; the pulverized coal injection amount is 21.5-48.5 t/h;
B. Calculating ingredients, checking and analyzing parameters and indexes:
b1, reference ingredients calculation, parameter and index checking analysis:
the wind pressure, the wind quantity, the wind temperature and w ([ Si ] are unchanged, wherein the wind temperature is the highest stable wind temperature, and if the factor fluctuation range in common ore smelting or medium titanium slag smelting is satisfied, the clinker rate < +/-1.0%, the comprehensive charging grade < +/-0.20%, the coke ash content < +/-0.1% and the pulverized coal ash content < +/-0.10%, the following steps are:
(1) Calculating theoretical fuel ratio, utilization coefficient and smelting period;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
(3) Calculating the multiple conversion coefficient of the corrected air quantity and the meter air quantity, and the oxygen enrichment rate after correcting the air quantity is 2.90-5.00%;
and B2, calculating ingredients, checking parameters and indexes of which main checking conditions change, and analyzing:
the wind pressure, the wind quantity, the wind temperature and w ([ Si ] are unchanged, wherein the wind temperature is the highest stable wind temperature, and if any factor fluctuation range in normal ore smelting or medium titanium slag smelting does not meet the following conditions of clinker rate < +/-1.0%, comprehensive furnace-entering grade < +/-0.20%, coke ash content < +/-0.1% and pulverized coal ash content < +/-0.10%:
(1) Calculating the hour coal quantity, batch theoretical iron quantity, theoretical coal ratio, coke butadiene ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting period and coal injection rate after factor change;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
C. the adjustment amount of the input pulverized coal injection is used for precisely controlling w ([ Si ]) and the iron slag components:
performing pre-control deviation check on the specified w ([ Si ]) and the actual w ([ Si ]), and if Shan Lu times of the absolute values of the specified w ([ Si ]) and the actual w ([ Si ]) are less than 0.05 percentage points, the check result is that adjustment is not needed; otherwise, the adjustment is needed;
the adjusting method comprises the following steps:
(1) Collecting comprehensive air supply parameters, indirect smelting parameters and fuel parameters;
(2) Inputting the adjustment amount of the pulverized coal injection to adjust the coal on the basis of the original pulverized coal injection amount, so as to obtain the new hour coal amount; then calculating theoretical material speed, the influence w ([ Si ]) quantity of coal dust adjustment quantity and the estimated w ([ Si ]) quantity after adjusting the coal dust quantity according to the collected comprehensive air supply parameter, indirect smelting parameter and fuel parameter, and judging the coal adjustment effect;
the judgment conditions are as follows:
(1) After the pulverized coal adjustment amount is input, the theoretical prediction influences the fluctuation of |w ([ Si ]) to be | <0.050%;
(2)|w([Si]) it is expected that -w([Si]) Provision for provision of |<0.03％；
Specifically, when the actual w ([ Si ]) value exceeds (or is lower than) the prescribed w ([ Si ]) value by more than 0.10% under the forward running of the furnace condition, the allowable coal amount is predicted to reach w ([ Si ]) value-actual w ([ Si ]) value| < 0.10%.
If the three conditions 1) to 2) are satisfied at the same time, and after checking the difference between the actual material speed after coal adjustment and the specified reference material speed, the judgment result is that adjustment is not needed, and w ([ Si ]) control effect check is needed; simultaneously calculating theoretical combustion temperature, blast kinetic energy, air permeability index and smelting period after coal blending;
The specific method for checking the w ([ Si ]) control effect comprises the following steps:
checking w ([ Si ]), and daily theoretical indexes, wherein the definition standard is as follows: the absolute value error rate of the difference between the daily theoretical coal ratio and the daily actual coal ratio and the coke ratio is less than 1.50%; if both the two conditions are satisfied, continuing the flow;
D. smelting and parameter control in a furnace:
in the smelting process of charging into the furnace, controlling the pulverized coal amount per hour to be less than or equal to 3 times in each shift, and controlling the molten iron |day theoretical control w ([ Si)]) Predicted value -Japanese specification w ([ Si)]) Plan value |<0.05 percentage points per day;
smelting conditions are as follows: the hot air pressure is 0.30-0.39 MPa, the top pressure is 0.155-0.195 MPa, the hot air temperature is 1150-1250 ℃, and the corrected air quantity entering the furnace is 3200-5700 m 3 Per min, the oxygen enrichment is 9400-15000 m 3 And/h, the pulverized coal injection amount is 135-165 kg/t iron, and the coal injection rate is 22.0-35.0%; 33.0 to 55.0 tons of ore batch, 7.2 to 11.0 tons of coke batch based on dry basis; the coke batch accounts for 0.45 to 0.70 ton based on dry basis; w ([ Si)]) 0.055-0.35%, slag alkalinity 1.10-1.18, molten iron temperature 1420-1480 ℃; in the smelting process, the slag ratio is 380-480 kg/t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag alkalinity is 1.10-1.18, the controlled air temperature is stable, the oxygen enrichment rate is 2.90-5.0%, and the air permeability index is 18000-22000 m 3 The theoretical combustion temperature is 2300-2400 ℃, the actual blowing speed is 255-275 m/S, the actual blowing kinetic energy is 17000-22000 kg.m/S, and the theoretical hourly material speed is 8.5-10.0 batches.
The sinter comprises 52.0-54.0% TFe and 5.5-6.5% SiO by mass percent 2 13.0 to 13.5 percent of CaO and 1.75 to 2 percent.19% Al 2 O 3 2.30 to 2.90 percent of MgO and 0.40 to 1.35 percent of TiO 2 0.045-0.055% S, 0.165-0.150% V 2 O 5 MnO 0.045-0.055%, unavoidable impurities in balance, bulk specific gravity 1.90-2.10 t/m 3 ；
The vanadium-titanium pellet ore comprises 53.5 to 57.5 percent of TFe and 4.5 to 5.5 percent of SiO according to mass percent 2 0.55 to 1.35 percent of CaO, 2.20 to 2.90 percent of Al 2 O 3 2.35 to 2.90 percent of MgO and 6.40 to 11.0 percent of TiO 2 0.55 to 0.75 percent of V 2 O 5 0.23 to 0.25 percent of MnO and the balance of unavoidable impurities; bulk specific gravity of 2.2-2.3 t/m 3 ；
The high silicic acid pellet comprises 58.5 to 60.0 percent of TFe and 6.5 to 7.5 percent of SiO according to mass percent 2 0.5 to 1.5 percent of CaO and 1.80 to 2.10 percent of Al 2 O 3 1.0 to 1.5 percent of MgO and 2.50 to 3.50 percent of TiO 2 0.165 to 0.150 percent of V 2 O 5 MnO 0.045-0.055%, unavoidable impurities in balance, bulk density 2.15-2.35 t/m 3 ；
The low-silicon lump ore comprises 64.0 to 66.0 percent of TFe and 3.0 to 4.5 percent of SiO according to mass percent 2 0.03 to 0.05 percent of CaO, 1.00 to 1.50 percent of Al 2 O 3 MgO and TiO in 0.01-1.0 wt% 2 <V1.0%, 0.030-0.050% 2 O 5 MnO 0.110-0.160%, unavoidable impurities in balance, bulk density 2.2-2.4 t/m 3 。
The coke component comprises 84.0-86.5% of C, 13.5-14.5% of ash, and the bulk specific gravity is 0.55-0.65 t/m 3 ；
The total analysis component of the coke ash comprises 53.0-56.0% of SiO by mass percent 2 2.20 to 3.0 percent of CaO and 24.0 to 26.0 percent of Al 2 O 3 MgO, tiO 0.15-1.0% 2 <2.0 percent, 0.35 to 0.45 percent of MnO, and the balance of unavoidable impurities;
the pulverized coal injection comprises, by mass, 76.0-78.0% of C, 13.5-15.0% of ash, 12.5-13.5% of volatile matters, and the particle size is 66-70% in terms of-200 meshes;
the full analysis component of the ash content of the pulverized coal injection comprises 55.0-57.0% of SiO by mass percent 2 5.20 to 6.50 percent of CaO, 23.0 to 25.0 percent of Al 2 O 3 MgO, tiO 2.20-2.50% 2 <2.0 percent, 0.35 to 0.45 percent of MnO and the balance of unavoidable impurities.
The comprehensive air supply parameters comprise: the air quantity, humidity, wind pressure, top pressure, wind temperature and air port area are measured; the indirect smelting parameters comprise corrected air quantity, oxygen enrichment rate after the air quantity is corrected, theoretical combustion temperature, air permeability index and blast kinetic energy; the fuel parameters include the batch weight, the composition and the pre-tuyere burning rate of coke and coke butyl, and the amount of the hour pulverized coal, the composition and the pre-tuyere burning rate of the pulverized coal.
The adjustment amount of the hour coal injection amount is less than 5.0 percent of the total amount of the original hour coal injection
And E, returning and correcting the actual smelting result: and E, according to the actual smelting result obtained in the step E, according to theoretical control and actual material speed, theoretical calculation control and actual w ([ Si ]) value, theoretical slag iron component and actual slag iron component, theoretical and actual tapping yield and theoretical and actual fuel ratio, correcting calculation parameters according to the calculation methods of the steps B-D, and continuing smelting.
Application example 1
A. The material is in vanadium titanium ore furnace burden structure, and comprises sinter, high titanium pellet 2 kinds and low silicon lump ore. And (5) performing reference batching and checking:
the chemical components of the sinter are as follows: TFe52.096%, siO 2 6.14％、CaO13.14％、Al 2 O 3 2.19％、MgO2.85％、TiO 2 1.337％、S 0.045％、V 2 O 5 0.142%, mnO0.241% and bulk specific gravity of 1.97t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The vanadium-titanium pellet (1) comprises the following components: TFe57.32%, siO 2 4.53％、CaO0.56％、Al 2 O 3 2.89％、MgO2.36％、TiO 2 6.46％、V 2 O 5 0.737%, mnO0.23%; pile ratioHeavy 2.28t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The vanadium-titanium pellet (2) comprises the following components: TF is 53.58 percent, siO 2 、5.14％、CaO1.23％、Al 2 O 3 2.52％、MgO2.71％、TiO 2 10.14% V 2 O 5 0.546%, mnO0.270%, bulk specific gravity 2.16t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The low silicon lump ore comprises the following components: TFe65.34%, siO 2 3.83％、CaO0.030％、Al 2 O 3 、1.08％、MgO0.010％、TiO 2 0.010％，V 2 O 5 0.030%, mnO0.199%, bulk specific gravity 2.30t/m 3 。
The coke comprises the following chemical components: c85.63%, ash 13.60%, bulk specific gravity 0.65t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The total analysis components of the coke ash are as follows: siO (SiO) 2 、54.352％、CaO2.636％、Al 2 O 3 24.897％、MgO0.463、TiO 2 1.55%, mnO0.39%; the chemical components of the pulverized coal are as follows: c77.58%, ash content 10.51%, volatile 13.31%, fineness (-200 mesh) 67%; the ash content of the injected pulverized coal is analyzed completely and the chemical components are as follows: siO (SiO) 2 47.245％、CaO5.475％、Al 2 O 3 23.85％、MgO2.38、TiO 2 1.284％、MnO0.370％。
Benchmark conditions and core results:
ore batch: 33000kg, coke batch (wet mass) 7600kg (dry basis 7296 kg), coke batch (wet mass) 500kg (dry basis 480 kg). Batching reference: reference: w ([ Si ]) value: 0.160%; and the basicity of the slag is 1.14. The reference material speed is 8.96 batches/h, and the reference coal quantity is 21615kg/h.
And (3) proportioning and core material results:
60 percent of sintered ore (20% +20% +20%) +2 percent of sintered small-grain ore, 15.0 percent of vanadium-titanium pellet ore (1), 19.0 percent of vanadium-titanium pellet ore (2) and 4.0 percent of low-silicon lump ore. Comprehensive charging grade TFe:53.69%.
B. Checking and analyzing ingredients, parameters and indexes
B1, reference ingredients calculation, parameter and index checking analysis:
the blast furnace is conventionally used in mineral batches and coke batches, and the chemical components (total analysis) of various materials are as in step A. And (3) under the condition of main reference parameters (clinker rate, comprehensive furnace charging grade, coke and pulverized coal ash) of the standard raw fuel, combining the standard operation parameters (standard coal quantity, standard material speed and standard w ([ Si ])) of the step A: the reference operation parameters such as the total wind (wind pressure, wind quantity), wind temperature, w ([ Si ]) are not adjusted.
Under the reference condition of the step A (seen as that the parameters of main raw fuel are stable (the fluctuation range is satisfied with the clinker rate < +/-1.0%, the comprehensive charging grade < +/-0.20%, the coke < +/-0.1% and the ash content of coal dust < +/-0.10%), the method directly enters the reference index determining step, and is carried out according to the following steps:
(1) Calculating theoretical fuel ratio, utilization coefficient, smelting period and the like under basic conditions
The calculated theoretical fuel ratio is 549.8kg/t (dry basis); the utilization coefficient is 3.696 t/(m) 3 D) a step of (d); the smelting cycle was 42.4 batches (tables 1 and 2).
Table 1 calculation of base conditions and checking of base indicators thereof
TABLE 2
(2) Delivering slag iron component and related intermediate process result according to reference conditions (all of the change amount of raw fuel is within the required range)
In each batch, the reduction rates of elements such as [ Si ], [ Ti ], [ Mn ], [ V ] and the like in molten iron under the condition of a preset value of w ([ Si ]) are obtained by fitting the reduction rates of the elements such as (w ([ Si ])-Si reduction rate, w ([ Si ])-Ti reduction rate, w ([ Si ])-Mn reduction rate and w ([ Si ])-V reduction rate, and the fitting relation of the w ([ Si ])-desulfurization rate, and the fitting polynomial of the removal rate of [ S ] and the preset value of w ([ Si ]) are as follows (figures 3 to 7):
the amounts of the corresponding element oxides and S, P, as in the molten iron were calculated from the reduction ratios (desulfurization ratios, and [ P ], [ As ] reduction ratios of 100%, etc.) of the above elements in combination with the material balance, and the amounts of the respective element oxides and S, P, as in the slag were further calculated, and the output slag amounts (slag ratio), alkali metals, lead-zinc and titanium, sulfur loads, etc., as well As theoretical slag components (including basicity, magnesium-aluminum ratio, etc.), theoretical pig iron components (calculated from the theory of the corresponding element oxides in the molten iron) (tables 3 to 6).
TABLE 3 obtaining the reduction ratio corresponding to the reference w ([ Si ]) from the fitting relation between the value of w ([ Si ]) and the reduction ratio of each element
Note that: reference w ([ Si ]) is input, and the others are automatic calculation outputs.
Table 4 shows the reference proportions, the slag amount (slag ratio) at the reference w ([ Si ]), the alkali metal, lead zinc and titanium, and the sulfur load
Table 5 shows the theoretical pig iron composition at reference w ([ Si ])
| Project | Si | S | P | Ti | As | V | Mn |
| Unit (B) | ％ | ％ | ％ | ％ | ％ | ％ | ％ |
| Numerical value | 0.16 | 0.056 | 0.072 | 0.205 | 0.018 | 0.19 | 0.227 |
Table 6 shows theoretical slag composition at reference w ([ Si ])
| Project | SiO 2 | CaO | MgO | S | Al 2 O 3 | TiO 2 | V 2 O 5 | MnO | Magnesium to aluminum ratio | Alkalinity (basicity) |
| Unit (B) | ％ | ％ | ％ | ％ | ％ | ％ | ％ | ％ | ||
| Numerical value | 28.73 | 32.63 | 10.66 | 0.72 | 12.51 | 13.65 | 0.43 | 0.64 | 0.852 | 1.14 |
In this example, the corrected air volume was calculated, and the air volume corrected by the actual fuel consumption (the cumulative average value of sampling was 3289.0m 3 The/min) and the corresponding air volume (the sampling cumulative average value is 2669.42 m) 3 The/min) is stable, and the value of the ratio is 1.22-1.24, wherein the ratio of the corrected air quantity to the meter air quantity is converted into the ratio of the corrected air quantity to the meter air quantity= 3289.0/2669.42 =1.23.
And B2, when main reference parameters (clinker rate, comprehensive furnace charging grade, coke ash and pulverized coal ash) of the basic raw fuel are changed beyond a stable range, entering a step B.
B2, batch calculation, parameter and index check analysis of main check conditions (clinker rate, comprehensive furnace charging grade, coke and pulverized coal ash) change:
a change in the raw fuel composition is detected. Wherein:
The chemical components of the sinter are as follows: TFe52.26%, siO 2 6.07％、CaO12.76％、Al 2 O 3 2.19％、MgO2.89％、TiO 2 1.283％、S 0.043％、V 2 O 5 0.14%, mnO0.24%, bulk specific gravity of 1.99t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The vanadium-titanium pellet (1) comprises the following components: TFe57.32%, siO 2 4.53％、CaO0.56％、Al 2 O 3 2.89％、MgO2.36％、TiO 2 6.46％、V 2 O 5 0.737%, mnO0.23%; bulk specific gravity 2.28t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The vanadium-titanium pellet (2) comprises the following components: TF is 53.58 percent, siO 2 、5.14％、CaO1.23％、Al 2 O 3 2.52％、MgO2.71％、TiO 2 10.14% V 2 O 5 0.546%, mnO0.270%, bulk specific gravity 2.16t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The low silicon lump ore comprises the following components: TFe65.34%, siO 2 3.83％、CaO0.030％、Al 2 O 3 、1.08％、MgO0.010％、TiO 2 0.010％，V 2 O 5 0.030%, mnO0.199%, bulk specific gravity 2.30t/m 3 。
The coke comprises the following chemical components: c85.54%, ash 13.63% and bulk specific gravity 0.65t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The total analysis components of the coke ash are as follows: siO (SiO) 2 、54.836％、CaO2.936％、Al 2 O 3 24.538％、MgO0.753％、TiO 2 1.55%, mnO0.39%; the chemical components of the pulverized coal are as follows: c77.98%, ash content 10.56%, volatile 13.35%, fineness (-200 mesh) 66%; the ash content of the injected pulverized coal is analyzed completely and the chemical components are as follows: siO (SiO) 2 47.245％、CaO5.475％、Al 2 O 3 23.85％、MgO2.38、TiO 2 1.284％、MnO0.370％。
In the embodiment, the grade of the sintering ore and ash content of the coke coal powder are changed, and the nuclear material is firstly prepared according to the step A method. Core material edge data: ore batch: 33000kg, 7600kg (dry basis 7296 kg) and 500kg (dry basis 480 kg) of coke batch (wet basis) (note: the coke batch is adjusted according to the raw fuel components and the grade after primary batching, clinker ratio). Batching reference: w ([ Si ]) value: 0.160%; and the basicity of the slag is 1.14. The standard material speed is 8.96 batches/h, and the standard coal quantity is 21615kg/h (note: the adjustment is needed according to the ash component change condition of the pulverized coal). And after the adjustment of the coke batch and the hour coal amount, checking and adjusting according to the batching result (according to the target slag alkalinity).
And (3) proportioning and core material results:
60 percent of sintered ore (21% +21% +21%) +2 percent of sintered small-grain ore, 15.0 percent of vanadium-titanium pellet ore (1), 19.0 percent of vanadium-titanium pellet ore (2) and 1.0 percent of low-silicon lump ore. Comprehensive charging grade TFe:53.40%.
In this example, the main parameters of the raw fuel are beyond the stable range (the clinker rate is increased by 3.0% > ±1.0%, the comprehensive charging grade is reduced by 0.29% > ±0.20%, the coke ash content is increased by 0.03%, and the ash content of the pulverized coal is increased by 0.05%), and the reference operating parameters are adjusted according to the change amplitude condition (including the determination of the coal amount and the coke batch in the reference hour after the raw fuel is changed):
the method comprises the following steps of: determining the hourly coal amount after factor change, calculating the theoretical iron amount of batch materials, the theoretical coal ratio, the new coke ratio and the coke-to-butyl ratio, determining the new coke batch materials, the theoretical fuel ratio of the batch materials with condition change, the utilization coefficient, the smelting period, the coal injection rate and the like (see tables 7-12 for details).
The concept and the calculation formula related in the calculation process are as follows:
hourly coal quantity after factor change 2 ＝l 1 -(m h1 -m h2 )*0.015*l 1
l 2 The coal amount is kg/t of the hour after the factor changes; l (L) 1 The coal amount is kg/t in the hour before the factor changes; m is m h1 The ash content of the pulverized coal before factor change is kg/t; the method comprises the steps of carrying out a first treatment on the surface of the m is m h2 The ash content of the pulverized coal after factor change is kg/t.
Ratio of focal length after factor change
d 2 ＝(ΣTFe 1 -ΣTFe 2 )*0.02*d 1 -(S 1 -S 2 )/5*1*d 1 /100-(w([Si]) 1 -w([Si]) 2 )
*0.01*d 1 -(J h1 -J h2 )*0.015*d 1 +d 1
d 2 The theoretical Jotin ratio after factor change is kg/t; d, d 1 The ratio of the coke to the butyl rubber before factor change is kg/t; sigma TFe 1 The comprehensive charging grade before factor change is kg/t; sigma TFe 2 The grade of the integrated furnace after factor change,%; s is S 1 Clinker rate before factor change,%; s is S 2 Clinker rate after factor change,%; j (J) h1 Coke ash,%; j (J) h2 As the coke ash after factor change,%.
Focal ratio after factor change
k 2 ＝(ΣTFe 1 -ΣTFe 2 )*0.02*k 1 -(S 1 -S 2 )/5*1*d 1 /100-(w([Si]) 1 -w([Si]) 2 )
*0.01*d 1 -(J 1 -J 2 )*0.015*k 1 +k 1
k 2 The theoretical coke ratio is kg/t after factor change; k (k) 1 The coke ratio before factor change is kg/t; sigma TFe 1 The comprehensive charging grade before factor change is kg/t; sigma TFe 2 The grade of the integrated furnace after factor change,%; s is S 1 Clinker rate before factor change,%; s is S 2 After being changed as a factorClinker rate,%; j (J) 1 Coke ash,%; j (J) 2 As the coke ash after factor change,%.
Factor-changed coke oven C 2 ＝(k 2 +d 2 )*t Management device /1000-J d
C 2 Determining coke batch, kg/t for the new factor change; j (J) d The dry diced coke is of constant weight, kg/t.
The batch theoretical fuel ratio, the utilization coefficient, the smelting period and the coal injection rate calculation formula are conventional formulas.
The calculated amounts are all calculated on a dry basis. The reference w ([ Si ]) is set unchanged, and the coke batch and the hour coal amount (coke oven is unchanged) are calculated and adjusted according to the original fuel variable.
(1) Calculating theoretical fuel ratio, utilization coefficient, smelting period and the like after condition change
According to the B2 calculation method and the steps, the obtained dry Jiao Pichong of the raw fuel after the condition change is 7369 kg/batch and the hour coal amount is 21632kg/h on the basis of basic parameters. Corresponding theoretical index changes: the calculated theoretical fuel ratio is 555.8kg/t (dry basis); the utilization coefficient is 3.68 t/(m) 3 D) a step of (d); the smelting cycle was 42.1 batches (Table 7).
Table 7 shows the index check after the raw fuel change (comparative base condition)
TABLE 8
Note that: the target (alkalinity) of the coke batch and the hour coal is checked to reach the target after the adjustment, and the burden proportion of the furnace burden structure is maintained.
(2) Adjusting the structural proportion of furnace burden, coke batch, slag iron components output after the coal quantity of hours and related intermediate process results according to the change of the raw fuel condition
The method is characterized in that each batch is taken as a unit, the reduction rates of elements such as [ Si ], [ Ti ], [ Mn ], [ V ] and the like in molten iron under the condition of preset w ([ Si ]) value are obtained, the reduction rates of the (w ([ Si ])-Si, the reduction rates of the w ([ Si ])-Ti, the reduction rates of the w ([ Si ])-Mn and the reduction rates of the w ([ Si ])-V are fitted, the fitting relation of the w ([ Si ])-desulfurization rate, and the fitting polynomial relation of the removal rate of the [ S ] and the preset w ([ Si ]) are shown in the foregoing (figures 1-1-1-5).
In the same manner as in step B1, the slag amount (slag ratio), alkali metal, zinc, titanium, sulfur load, etc., as well as theoretical slag components (including basicity, magnesium-aluminum ratio, etc.), theoretical pig iron components (tables 9 to 12) after the change of the raw fuel were outputted.
TABLE 9 obtaining the reduction ratio corresponding to the reference w ([ Si ]) from the fitting relation between the value of w ([ Si ]) and the reduction ratio of each element
Note that: reference w ([ Si ]) is input, and the others are automatic calculation outputs.
Table 10 shows the ratio of the change, the slag amount (slag ratio) at the reference w ([ Si ]), the alkali metal, zinc and titanium, and the sulfur load
| Project | Slag quantity | Slag ratio | K load | Na load | Zn load | S load | Ti load | Basicity of slag |
| Unit (B) | Kg/pi | Kg/t | Kg/t | Kg/t | Kg/t | Kg/t | Kg/t | Multiple times |
| Reference condition | 8689 | 468 | 2.58 | 1.18 | 0.39 | 3.91 | 40.35 | 1.14 |
| Raw material variation | 8768 | 475 | 2.60 | 1.21 | 0.41 | 3.97 | 40.22 | 1.14 |
Table 11 shows the theoretical pig iron composition at the reference w ([ Si ]) after the change of the raw fuel
| Project | Si | S | P | Ti | As | V | Mn |
| Unit (B) | ％ | ％ | ％ | ％ | ％ | ％ | ％ |
| Reference condition | 0.16 | 0.056 | 0.072 | 0.205 | 0.018 | 0.19 | 0.227 |
| Raw material variation | 0.16 | 0.057 | 0.071 | 0.204 | 0.032 | 0.165 | 0.366 |
Table 12 shows the theoretical slag composition at the reference w ([ Si ]) after the change of the raw fuel
The correction air volume multiple is the same as that in the step B1 (1.23 times).
In the smelting process, the reference w ([ Si ]) is changed frequently, and the control is carried out by combining the 'coal control w ([ Si ])'.
C. The adjustment amount of the input pulverized coal injection is used for precisely controlling w ([ Si ]) and the iron slag component
The method comprises the steps of setting w ([ Si ]) in the smelting process of the blast furnace according to the steps, adjusting the coal injection quantity in an hour to accurately pre-control the w ([ Si ]), and carrying out checking and analysis by combining the actual w ([ Si ]) obtained after the adjustment reaction.
According to the definition principle (Shan Lutie times (prescribing the absolute value of w ([ Si ]) and actual w ([ Si ]) and 0.05 percent point) of checking the adjustment quantity of the pulverized coal injection, according to the above, whether the adjustment quantity of the pulverized coal injection is used for accurately controlling the w ([ Si ]) and the slag iron component for the value of the molten iron w ([ Si ]) of the blast furnace under the first and second groups of furnace materials conditions is carried out.
(1) Parameters (including calculated indirect smelting parameters and fuel parameters) which need to be collected. The comprehensive air supply parameters obtained by direct collection comprise: the surface air quantity, humidity, wind pressure, top pressure, wind temperature, air port area and the like; the indirect smelting parameters (automatic calculation) include corrected air volume obtained according to the table-actual air volume correction coefficient (or fitting polynomial), and oxygen enrichment rate, theoretical combustion temperature, air permeability index, blast kinetic energy, check and the like after correcting the air volume (table 13-table 15). The fuel parameters that need to be collected include: the batch weight, the components and the front air port burning rate of coke and diced coke; the hourly pulverized coal amount, pulverized coal components and the tuyere front combustion rate. In addition, the real-time hour coal amount is collected in real time and automatically accumulated to the hour.
(2) And determining the adjustment amount of the pulverized coal injection and precisely controlling the amount of molten iron w ([ Si ]).
The output results (table 12-table 15) were calculated according to the principle of whether to adjust the molten iron w ([ Si ]) value and the determination step of the pulverized coal injection adjustment (original pulverized coal injection amount → pulverized coal injection adjustment amount (input) → new hour coal amount → theoretical material speed (ton coal consumption air volume, hour coal consumption air volume, ton coke consumption air volume, residual air volume after coal burning obtained by combining the comprehensive blast parameters and the fuel parameters in step (1)), the pulverized coal adjustment amount influences w ([ Si ]) amount → estimated w ([ Si ]) pulverized coal adjustment effect determination after pulverized coal adjustment). The output is calculated according to the following concepts and formulas:
The coal quantity is expected to affect the molten iron w ([ Si)]) Quantity w ([ Si)]) Influence quantity ＝(M Adjustment of /L Real time /(Fe pl /1000)/(J Batch of materials /Fe pl +J Batch d /Fe pl +M
Base group ))*100/10
w([Si]) Influence quantity Molten iron w ([ Si) influenced by theoretical calculation of pulverized coal injection adjustment amount]) Amount,%; m is M Adjustment of The adjustment amount of the pulverized coal is kg/h; l (L) Real time The method is a real-time theoretical material speed calculated according to parameters such as real-time corrected air quantity, oxygen enrichment rate obtained according to real-time oxygen enrichment after the air quantity is corrected, and the like, and the batch/h is calculated; fe (Fe) pl Theoretical iron yield of each batch of ore, kg/t; j (J) Batch of materials Kg/batch for each batch of coke dry basis; j (J) Batch d For each dry basis of the coke breeze, kg/batch,%. M is M Base group The ratio of the coal is kg/t. Note that: m is M Adjustment of Is an arbitrary input value (integer multiple of 100).
Wherein:
real-time theoretical material speed L Real time ＝(V School and school *60-V mh )*f Wind power /V C /(J Batch of materials +J Batch d )*1000
L Real time The theoretical material speed is calculated according to the real-time oxygen enrichment and corrected air quantity, and the batch/h is calculated; v (V) School and school M for the air volume after correcting the surface air volume value 3 /min；V mh The hour coal consumption air quantity, m, obtained by calculating the real-time correction air quantity and oxygen enrichment rate 3 /h；f Wind power Wind utilization rate,%; v (V) C To correct the ton coke consumption air quantity (the ton coke consumption air quantity after the oxygen enrichment rate is obtained by using the real-time oxygen enrichment amount) after the air quantity is corrected, m 3 /t；J Batch of materials Kg/batch for each batch of coke dry basis; j (J) Batch d For each dry basis of the coke breeze, kg/batch,%.
Correcting air volume V School and school ＝((J Real world *1000*J C real /100*Φ C /100+J d real *1000*J dC solid /100*Φ JDC )+(M Real world *1000*M C real
/100*Φ MC ))*0.9333/(0.21+0.29*f h2O /8/100+0.79*f O2 /100)/24/60
V School and school M for the air volume after correcting the surface air volume value 3 /min；J Real world Dry basis, t, is daily consumption of coke used in the present period; j (J) C real The carbon content of the coke used in the present period,%; phi C The combustion rate of coke before a tuyere is shown as percent; j (J) d real The dry basis, t, is consumed for the day of the current-period use of the diced coke; j (J) dC solid The carbon content of the coke used in the present period,%; phi JDC The burning rate of the coke butyl before the tuyere is%; m is M Real world The daily dry basis weight, t, of the pulverized coal injection used in the present period is consumed; m is M C real The carbon content of the pulverized coal used in the present period is percent; phi MC The combustion rate of the pulverized coal before the tuyere is%; f (f) h2O Is atmospheric humidity, g/m 3 ；f O2 Oxygen enrichment rate calculated for the table air volume,%. And (3) injection: the coke content (daily consumption) comes from a period of time in the past under similar raw fuel conditionsActual values.
Oxygen enrichment rate F after correcting air quantity O2 ＝0.785*V O2 /60/(V School and school +V O2 /60)*100
F O2 To calculate the oxygen enrichment rate,%; v (V) O2 To the oxygen enrichment in the present period, m 3 And/h. The rest are the same as above. Ton coal consumption air volume V after correcting air volume m ＝1000*M C real
/100/24*22.4/(0.21+0.29*f h2O /100+0.79*F O2 /100)*Φ MC
V m To correct ton coal consumption air quantity after air quantity, m 3 T; the rest are the same as above;
the hour coal consumption air volume V after the oxygen enrichment rate is corrected mh ＝V m *m h /1000
V mh To correct the hour coal consumption air quantity after the oxygen enrichment rate, m 3 /h；m h The coal amount is the hour, kg/t; the rest are the same as above.
Ton coke consumption air volume V after correcting air volume C ＝1000*J C real
/100/24*22.4/(0.21+0.29*f h2O /100+0.79*F O2 /100)*Φ C
V C To correct the ton coke consumption air quantity after the air quantity, m 3 T; the rest are the same as above.
And similarly, obtaining the corrected air quantity, the theoretical combustion temperature, the blasting kinetic energy, the air permeability index and the like after correcting the oxygen enrichment rate (the corrected air quantity is brought into a conventional calculation formula).
Batch theoretical iron content Fe pl For routine calculation, M Base group Is the selected reference coal ratio t.
Coal quantity adjusting predicted molten iron w ([ Si)]) The quantity is expected to reach the value w ([ Si)]) It is expected that ＝w([Si]) Actual practice is that of +w([Si]) Influence quantity
w([Si]) It is expected that The molten iron w ([ Si) which is expected to be achieved after pulverized coal injection adjustment]) Amount,%; w ([ Si)]) Actual practice is that of In order to adjust the actual molten iron w ([ Si) discharged from the furnace after the reaction of the pulverized coal injection amount]) Amount,%; w ([ Si)]) Influence quantity Shadow calculated for coal powder injection adjustment theoryLoud molten iron w ([ Si)]) The amount, the sign of which is determined by increasing or decreasing the coal injection amount (increasing the coal injection amount is "+" sign, decreasing the coal injection amount is "-").
The results and process parameters obtained in this example are shown in tables 13 to 15 (data and operations in two natural classes).
TABLE 13 coal blending definition and coal blending accurate control of molten iron w ([ Si ]) amount data acquisition (calculation) and process, effect
TABLE 14
TABLE 15
/>
/>
Note that: the plan w ([ Si ]) and the range are: 0.16% +/-0.05%, wherein the absolute value of the difference between the actual value and the planned value exceeds 0.05 percent, namely, the actual value w ([ Si ]) is adjusted, and the actual value w ([ Si ]) of the previous furnace is filled in the non-reaction period of the adjustment; and during the period that the coal quantity is not completely reacted in the previous coal quantity adjustment, the next coal powder injection adjustment is not performed.
Control coal w ([ Si)]) (molten iron w ([ Si)]) Value of tapping w ([ Si)]) Actual practice is that of The control effect (reflected 3.5 hours after the coal blending amount) according to the falling time of the adjustment factors: the adjustment of the example achieves the effect (the first natural shift is used for adjusting the coal for 2 times and the second natural shift is used for adjusting the coal for 1 time) and reaches w ([ Si)]) The control effect, furthermore, the input hour coal quantity adjustment quantity reaches the requirement and is based on the coal adjustmentThe obtained theoretical fuel ratio and the planned required fuel ratio are subjected to error check (errors and absolute value of fluctuation of the fuel ratio under the condition of unifying raw fuel)<5 kg/t) to reach the next cycle. Step C3 is entered. And C3, entering the next period after the step C3.
The situation that the furnace condition is smooth and the theoretical material speed is different from the actual material speed by more or less than 1.0 batch/h does not occur.
C3, predicting and pre-controlling slag iron components after adjusting and blowing coal powder to accurately control w ([ Si ]) and checking the effect of adjusting coal quantity to accurately control w ([ Si ])
(1) The iron slag component is obtained and checked by using the obtained pre-control w ([ Si ]) value.
From the above, w ([ Si ] is estimated after the input hour pulverized coal amount reaches the reaction period]) It is expected that The values were added to the values obtained above (fitting relation obtained in step B) (w ([ Si)]) Si reduction ratio, w ([ Si)]) -Ti reduction ratio, w ([ Si)]) Mn reduction ratio, w ([ Si)]) V reduction Rate, w ([ Si)]) In the fitting relation of the desulfurization rate, w ([ Si) in the furnace molten iron is obtained])、w([S])、w([P])、w(Ti])、w([As])、w([V]) Theoretical calculated values such as w (Mn); further, w (SiO) in the furnace slag is obtained 2 )、w(CaO)、w(MgO)、w(Al 2 O 3 )、w(TiO 2 )、w(V 2 O 5 ) Theoretical calculation values of w (MnO) and the like (step (1) in B1).
Further, the obtained iron slag composition was checked: will pre-control w ([ Si)]) It is expected that Values and other w ([ S)])、w([P])、w(Ti])、w([As])、w([V]) Sampling, analyzing, comparing and checking pig iron components such as w (Mn) and the like with a conventional method of tapping a sample in a corresponding time (the end of a coal adjustment reaction period); will pre-control w ([ Si)]) It is expected that Under the value condition, w (SiO) in other slag is obtained 2 )、w(CaO)、w(MgO)、w(Al 2 O 3 )、w(TiO 2 )、w(V 2 O 5 ) Slag components such as w (MnO) and the like are compared and checked with a conventional method for sampling, analyzing and checking slag samples in a corresponding time (focusing and coal adjusting reaction period is finished) (tables 16 and 17).
TABLE 16 coal Precontrol w ([ Si ]) value (adjustment time hit furnace) to obtain slag iron component and check and process, effect
TABLE 17
/>
Checking results: in the embodiment, the w ([ Si ]) value is adjusted to achieve the effect (the first natural shift is used for adjusting coal 2 times and the second natural shift is used for adjusting coal 1 time), the control effect of the w ([ Si ]) (the molten iron w ([ Si ])) value is achieved, and other slag iron pre-control components are all in the required range.
(2) Checking the average w ([ Si ]) and theoretical indexes of the example
The average w ([ Si ]) value, daily theoretical coal ratio, coke ratio and daily actual coal ratio, and the daily theoretical yield and daily actual yield calculated according to the theoretical material speed are compared and checked (Table 18) to reach the required range. The concept, calculation method and formula of the theoretical yield and theoretical index are as follows:
theoretical yield (calculated in terms of tapping time duration and interval) t Iron tapping theory ＝Σ(ROUND((time The furnace is finished -time End of charging into furnace )*24,3)*L Real time *O Material batch /1000*ΣTFe/100*0.99/0.94)
t Iron tapping theory The accumulated theoretical iron quantity, t/d, is calculated according to the interval time of tapping of each heat in a natural day; time of The furnace is finished Calendar operation time for the furnace, h: min; time of End of charging into furnace Calendar operation time for last heat, h: min; l (L) Real time The theoretical material speed is calculated according to the real-time oxygen enrichment and corrected air quantity, and the batch/h is calculated; o (O) Material batch Is a mineStone batch weight, kg/h; Σtfe is the integrated charge grade,%.
Theoretical yield (theoretical iron output according to hour feed rate) t Lower cooking ＝AVERAGE(L Real time *24*O Material batch
/1000*ΣTFe/100*0.99/0.94)
t Iron tapping theory The average value of daily output, t/d, is obtained according to the hour theoretical iron amount obtained by correcting the air quantity and the oxygen enrichment rate per hour; the rest are the same as above. The daily theoretical iron output is obtained by accumulating the hour to the day.
Theoretical fuel ratio (theoretical iron output per hour) theoretical calculation of K Lower cooking ＝C Dry coke batch *L Real time *24/t Lower cooking +M Coal injection in an hour *24/t Lower part(s) Food processing
K Lower cooking An hour theoretical fuel ratio kg/t obtained from an hour theoretical iron amount obtained by correcting the air quantity and the oxygen enrichment rate per hour; m is M Coal injection in an hour The coal injection amount is kg/h in real time; the rest are the same as above.
The theoretical fuel ratio fluctuation within + -5 kg/t under the same raw fuel condition is reflected in the operation process.
Table 18 comparison of the average theoretical value and the actual value, check
D. According to the previous steps (preliminary checking of blast furnace conditions, focusing and batch (containing coke butyl), oxygen and material adjustment, coal and temperature adjustment), the adjusted raw fuel and smelting parameters are fed into a furnace, and smelting parameter adjustment is controlled: the method comprises the steps of accurately controlling the material speed, accurately controlling the w ([ Si ]) (the molten iron w ([ Si ])) value, controlling and calculating the iron slag component, performing index real-time theoretical prediction and pre-control, and smelting according to the material sequence when the flow defining conditions of all steps meet the requirements and are within the error range.
Smelting in a furnace and controlling parameters:
d1, adding the sum of the four ores described in A to 100 percent (titanium slag smelting in vanadium-titanium ore in this example), and coke (containingDiced coke) into a blast furnace according to the conventional amount; after checking the state of the blast furnace, under the conditions of fixed air temperature, full air and oxygen regulating materials, quantitative modularized coal regulation is adopted to accurately control the molten iron w ([ Si)]) The value "the number of times of pulverized coal amount per hour of each shift is less than or equal to 3 times (the first natural shift is adjusted for 2 times and the second natural shift is adjusted for 1 time in the example), and the molten iron |day theoretical control w ([ Si ] is realized]) Predicted value -Japanese specification w ([ Si)]) Actual value |<0.05 percentage points per day (0.034 percentage points in this example).
D2, smelting under the following conditions:
the example is the smelting of titanium slag in vanadium titanium ore, and the parameter smelting range is as follows: the hot air pressure is 0.319-0.344 MPa (full air), the top pressure is 0.154-0.166 MPa, the hot air temperature is 1170 ℃ (top air temperature), and the furnace air inlet volume (corrected) is 3250-3354 m 3 Per min, the oxygen enrichment is 9408-11308 m 3 The pulverized coal injection amount is 136-143 kg/t iron (the raw fuel analysis exceeds the prescribed change for 1 time, and the coal injection rate is 24.2-26.1 percent); 33.0 tons of ore batch, 7.296 to 7.369 tons of coke batch (dry basis); 0.48 ton of diced coke (dry basis); w ([ Si) ]) 0.102-0.153 percent (vanadium titanium ore smelting), 1.12-1.15 percent of slag alkalinity, and 1432-1452 ℃ of molten iron temperature. Are all within a prescribed range.
The present example adjusts focus batches according to defined principles and methods. The effect of this adjustment reflects a time of 1 smelting cycle.
In this example, the amount of pulverized coal injected in an hour (the amount of fine adjustment of molten iron w ([ Si ]) was adjusted 3 times in 2 natural shifts, the amount of adjustment of the amount of pulverized coal injected in an hour was < 5.0% of the total amount of pulverized coal injected in an original hour, and the effective reaction time of the adjustment was 3.5 hours.
The falling time reflected by the adjusting effect is automatically found to be the function solution.
The effect completion time of the above influencing factors is respectively as follows: the charging grade, the slag alkalinity, the clinker rate and the top pressure are all one smelting period (4.5-5.5 hours, automatic calculation), the pulverized coal is injected for 3.5 hours, and the air quantity, the air temperature and the humidity are 1 hour. The adjusting node is used for changing corresponding influencing factors and conforming to the acting time of the adjusting factors so as to maintain the relative stability of the comprehensive fuel ratio (the absolute value of the deviation of the raw fuel components under the same raw fuel condition (when the adjustment of the coke batch is not needed) is less than 5 kg/t).
D3, smelting under the following conditions:
in the actual smelting process, the slag ratio is 468-475 kg/t, the magnesium-aluminum ratio in the slag is 0.842-0.867, the slag alkalinity is 1.12-1.15, the constant air temperature is 1170 ℃, the oxygen enrichment rate (after correcting the air quantity) is 3.90-4.24%, and the air permeability index is 18336-20039 m 3 /(min.MPa), theoretical combustion temperature 2352-2374 ℃, actual blowing speed 261-269 m/S, actual blowing kinetic energy (after air volume correction) 15965-18106 kg.m/S, theoretical hourly material speed 8.62-8.87 batch/h.
When the oxygen regulating material and the coal regulating temperature are used, except that the obtained deviation value accords with the requirement range of the material speed and the silicon deviation, the direct smelting parameters such as air quantity, air pressure, top pressure and the like are all in the range, and the indirect smelting parameters such as air permeability index, theoretical combustion temperature, blast kinetic energy and the like obtained through automatic calculation are all in the range. Vanadium titanium ore smelting blast furnace w ([ Si)]) Lower limit of the value, w (MgO)/w (Al) 2 O 3 ) The value takes the upper limit.
The actual smelting result of the example is returned and corrected, and the hour theory and actual material speed, theoretical calculation control and actual w ([ Si ]) value, theoretical slag iron component and actual slag iron component, theoretical and actual tapping yield (daily), theoretical and actual fuel ratio comparison and check all reach the control requirements. Related parameters do not need to be changed or corrected.
The calculation process in the step A is as follows: knowing the total composition of raw fuel (sinter, pellet, lump ore, coke and coal dust), and determining the burden ratio according to the basic w ([ Si ]) value, the specified slag alkalinity and the magnesium-aluminum ratio range.
The calculation process in the step B (B1-B2) is as follows: knowing the total analysis of the raw fuel, when the fluctuation range is required (step B1), the total wind (wind pressure, wind quantity), the wind temperature and w ([ Si) ]) The reference operating parameters are not adjusted, and the reference operating parameters (reference coal amount, reference feed rate, reference w ([ Si)]) Calculating theoretical indexes, smelting period, reduction rate of each element of molten iron, load of alkali metal, lead zinc titanium sulfur, slag iron components and the like; knowing the full analysis of the raw fuel, if any of the main parameters exceeds the fluctuation range (step B2), the reference operating parameters are changed according to the changeAmplitude conditions are adjusted (including the determination of the coal quantity and the coking lot of the reference hour after the change of the raw fuel) according to the reference ore lot, the coking lot (dry basis) and w ([ Si)]) And checking indirect smelting parameters such as proportion, coking lot, hour coal injection amount, smelting period and the like in a range with unchanged air temperature and constant slag alkalinity, and calculating the hour coal amount, batch theoretical iron amount, theoretical coal ratio, coke ratio and coke-to-butadiene ratio after factor change, new coking lot, batch theoretical fuel ratio under basic condition change, utilization coefficient, smelting period, coal injection rate and the like according to the following sequence. The related concepts and calculations are: hourly coal quantity after factor change 2 Focus-to-butyl ratio d after factor change 2 Focal ratio k after factor change 2 Coke lot C after factor change 2 The calculated amounts are all calculated on a dry basis. Reference w ([ Si) ]) The setting is unchanged, and the coke batch and the hour coal amount (coke butyl) are unchanged according to the original fuel variable. Other calculations: batch theoretical fuel ratio, utilization coefficient, smelting period and coal injection rate.
The computer checking process in the step C (comprising the steps of C1-C3) is as follows: defining according to the principle of whether the hour coal injection amount is regulated in the smelting process, wherein the definition is that the regulation is not needed, and the next period is directly entered; the method is defined as that the absolute value of w ([ Si ]) and the actual value of w ([ Si ]) are required to be adjusted (the absolute value of w ([ Si ]) is greater than 0.05 percent), and theoretical calculation and check are carried out according to a method for precisely controlling the blast furnace w ([ Si ]) (the molten iron w ([ Si ]) value). Knowing (directly collecting) comprehensive air supply parameters (including surface air quantity, humidity, air pressure, top pressure, air temperature, air port area and the like), fuel components and related parameters (including the batch weight of coke and coke, the component and the air port front combustion rate, the hourly pulverized coal quantity, the pulverized coal component and the air port front combustion rate), and automatically calculating indirect smelting parameters (including the obtained corrected air quantity according to the surface-actual air quantity correction coefficient (or fitting polynomial), the oxygen enrichment rate after correcting the air quantity, the theoretical combustion temperature, the air permeability index, the air blast kinetic energy and the like). And E, smelting control ranges of the parameters are shown in the step. Knowing the above-mentioned relevant parameters (acquisition or calculation results), the calculation sequence and procedure are: the method comprises the steps of (1) raw pulverized coal injection amount, (input) pulverized coal injection adjustment amount, (input) new hour coal amount, (theoretical material speed (ton coal consumption air volume obtained by combining comprehensive blast parameters and fuel parameters in the step (1), hour coal consumption air volume, ton coke consumption air volume and residual air volume after coal burning), pulverized coal adjustment amount influence w ([ Si ]) amount, (predicted w ([ Si ]) amount after pulverized coal adjustment) and coal adjustment effect judgment. And checking the control effect of w ([ Si ]) after coal adjustment (input adjustment quantity), wherein the method comprises the steps of obtaining slag iron components by using the obtained precontrolled w ([ Si ]) value, checking, and comparing and checking the daily average w ([ Si ]) value, daily theoretical coal ratio, coke ratio, daily actual coal ratio and coke ratio, and the theoretical yield and daily actual yield obtained by daily calculation according to the theoretical material speed. In the process, the corrected air quantity is brought into a conventional calculation formula to obtain the corrected air quantity and the theoretical combustion temperature, the blast kinetic energy, the air permeability index, the smelting period and the like after the oxygen enrichment rate is corrected.
The method is to repeatedly input the adjustment quantity of the hour coal injection quantity until the theoretical value w ([ Si)]) The output value is expected to meet the requirements (the calculations are all automatic). The process involves the calculation of the concepts and formulas: the coal quantity is expected to affect the molten iron w ([ Si)]) Quantity w ([ Si)]) Influence quantity Real-time theoretical material speed L Real time Correcting the air volume V School and school Oxygen enrichment F after correcting air quantity O2 Ton coal consumption air volume V after correcting air volume m Hour coal consumption air volume V after correcting oxygen enrichment rate mh Ton coke consumption air volume V after correcting air volume C Molten iron w ([ Si) is estimated by coal blending amount]) The quantity is expected to reach the value w ([ Si)]) It is expected that . Also includes a tapping w ([ Si)]) Actual practice is that of And (3) determining and checking the value of the fuel oil, and performing error check according to the theoretical fuel ratio obtained after coal adjustment and the planned required fuel ratio. The process involves calculating concepts and formulas to be theoretical yield (theoretical calculation in terms of tapping time duration and interval) t Iron tapping theory Theoretical yield (theoretical iron output according to hour feed rate) t Lower cooking Theoretical fuel ratio (iron output according to hour theory) theoretical calculation K Lower cooking 。
The checking process in the step E is as follows: and C, correcting the calculation parameters according to the actual smelting result obtained in the step E and the calculation methods of the steps B to D to form a closed loop.
Application example 2
A. The material is in vanadium titanium ore furnace burden structure, and comprises sinter, high titanium pellet 2 kinds and low silicon lump ore. And (5) performing reference batching and checking:
the chemical components of the sinter are as follows: TFe52.26%, siO 2 6.07％、CaO12.76％、Al 2 O 3 2.19％、MgO2.89％、TiO 2 1.283％、S 0.043％、V 2 O 5 0.14%, mnO0.24%, bulk specific gravity of 1.99t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The vanadium-titanium pellet (1) comprises the following components: TFe57.32%, siO 2 4.53％、CaO0.56％、Al 2 O 3 2.89％、MgO2.36％、TiO 2 6.46％、V 2 O 5 0.737%, mnO0.23%; bulk specific gravity 2.28t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The vanadium-titanium pellet (2) comprises the following components: TF is 53.58 percent, siO 2 、5.14％、CaO1.23％、Al 2 O 3 2.52％、MgO2.71％、TiO 2 10.14% V 2 O 5 0.546%, mnO0.270%, bulk specific gravity 2.16t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The low silicon lump ore comprises the following components: TFe65.34%, siO 2 3.83％、CaO0.030％、Al 2 O 3 、1.08％、MgO0.010％、TiO 2 0.010％，V 2 O 5 0.030%, mnO0.199%, bulk specific gravity 2.30t/m 3 。
The coke comprises the following chemical components: c85.54%, ash 13.63% and bulk specific gravity 0.65t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The total analysis components of the coke ash are as follows: siO (SiO) 2 、54.836％、CaO2.936％、Al 2 O 3 24.538％、MgO0.753％、TiO 2 1.55%, mnO0.39%; the chemical components of the pulverized coal are as follows: c77.98%, ash content 10.56%, volatile 13.35%, fineness (-200 mesh) 66%; the ash content of the injected pulverized coal is analyzed completely and the chemical components are as follows: siO (SiO) 2 47.245％、CaO5.475％、Al 2 O 3 23.85％、MgO2.38％、TiO 2 1.284％、MnO0.370％。
Benchmark conditions and core results:
ore batch: 33000kg, coke batch (wet mass) 7676kg (dry mass 7369 kg), coke batch (wet mass) 500kg (dry mass 480 kg). Batching reference: reference: w ([ Si ]) value: 0.160%; and the basicity of the slag is 1.14. The reference material speed is 8.96 batches/h, and the reference coal quantity is 21632kg/h.
And (3) proportioning and core material results:
63 percent of sintered ore (21% +21% +21%) +3 percent of sintered small-sized ore, 15.0 percent of vanadium-titanium pellet (1), 19.0 percent of vanadium-titanium pellet (2) and 1.0 percent of low-silicon lump ore. Comprehensive charging grade TFe:53.40%.
B. Checking and analyzing ingredients, parameters and indexes
B1, reference ingredients calculation, parameter and index checking analysis:
the blast furnace is conventionally used in mineral batches and coke batches, and the chemical components (total analysis) of various materials are as in step A. And (3) under the condition of main reference parameters (clinker rate, comprehensive furnace charging grade, coke and pulverized coal ash) of the standard raw fuel, combining the standard operation parameters (standard coal quantity, standard material speed and standard w ([ Si ])) of the step A: the reference operation parameters such as the total wind (wind pressure, wind quantity), wind temperature, w ([ Si ]) are not adjusted.
Under the reference condition of the step A (seen as that the parameters of main raw fuel are stable (the fluctuation range is satisfied with the clinker rate < +/-1.0%, the comprehensive charging grade < +/-0.20%, the coke < +/-0.1% and the ash content of coal dust < +/-0.10%), the method directly enters the reference index determining step, and is carried out according to the following steps:
(1) Calculating theoretical fuel ratio, utilization coefficient, smelting period and the like under basic conditions
The calculated theoretical fuel ratio is 555.80kg/t (dry basis); the utilization coefficient is 3.676 t/(m) 3 D) a step of (d); the smelting cycle was 42.1 batches (tables 19 and 20).
Table 19 shows the calculation of the basic conditions and the checking of the basic indexes
Table 20
(2) Delivering slag iron component and related intermediate process result according to reference conditions (all of the change amount of raw fuel is within the required range)
The calculation process, method and results are the same as in application example 1.
The amounts of the corresponding element oxides and S, P, as in the molten iron were calculated from the reduction ratios of the obtained elements (desulfurization ratio, and [ P ], [ As ] reduction ratio of 100%, etc.), the amounts of the respective element oxides and S, P, as in the slag were further calculated in combination with the material balance, and the output slag amounts (slag ratio), the loads of alkali metals, lead zinc, titanium, sulfur, etc., and theoretical slag components (including basicity, magnesium aluminum ratio, etc.), theoretical pig iron components (theoretical calculation from the corresponding element oxides in the molten iron) (tables 21 to 24).
TABLE 21 obtaining the reduction ratio corresponding to the reference w ([ Si ]) from the fitting relation between the value of w ([ Si ]) and the reduction ratio of each element
Note that: reference w ([ Si ]) is input, and the others are automatic calculation outputs.
Table 22 shows the reference proportions, the slag amount (slag ratio) at the reference w ([ Si ]), the alkali metal, lead zinc and titanium, and the sulfur load
Table 23 shows the theoretical pig iron composition at reference w ([ Si ])
| Project | Si | S | P | Ti | As | V | Mn |
| Unit (B) | ％ | ％ | ％ | ％ | ％ | ％ | ％ |
| Numerical value | 0.16 | 0.057 | 0.071 | 0.204 | 0.032 | 0.165 | 0.236 |
Table 24 shows theoretical slag composition at reference w ([ Si ])
| Project | SiO 2 | CaO | MgO | S | Al 2 O 3 | TiO 2 | V 2 O 5 | MnO | Magnesium to aluminum ratio | Alkalinity (basicity) |
| Unit (B) | ％ | ％ | ％ | ％ | ％ | ％ | ％ | ％ | Multiple times | Multiple times |
| Numerical value | 28.85 | 32.91 | 10.90 | 0.71 | 12.55 | 13.41 | 0.43 | 0.69 | 0.868 | 1.14 |
In this example, the corrected air volume was calculated, and the air volume corrected by the actual fuel consumption (the cumulative average value of sampling was 3289.0m 3 The/min) and the corresponding air volume (the sampling cumulative average value is 2669.42 m) 3 The/min) is stable, and the value of the ratio is 1.22-1.24, wherein the ratio of the corrected air quantity to the meter air quantity is converted into the ratio of the corrected air quantity to the meter air quantity= 3289.0/2669.42 =1.23.
And B2, when main reference parameters (clinker rate, comprehensive furnace charging grade, coke ash and pulverized coal ash) of the basic raw fuel are changed beyond a stable range, entering a step B.
B2, batch calculation, parameter and index check analysis of main check conditions (clinker rate, comprehensive furnace charging grade, coke and pulverized coal ash) change:
a change in the raw fuel composition is detected. Wherein:
the chemical components of the sinter are as follows: TFe51.76%, siO 2 6.25％、CaO12.96％、Al 2 O 3 2.11％、MgO2.77％、TiO 2 1.253％、S 0.041％、V 2 O 5 0.141%, mnO0.22%, bulk specific gravity of 1.93t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The vanadium-titanium pellet (1) comprises the following components: TFe57.32%, siO 2 4.53％、CaO0.56％、Al 2 O 3 2.89％、MgO2.36％、TiO 2 6.46％、V 2 O 5 0.737%, mnO0.23%; bulk specific gravity 2.28t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The vanadium-titanium pellet (2) comprises the following components: TF is 53.58 percent, siO 2 、5.14％、CaO1.23％、Al 2 O 3 2.52％、MgO2.71％、TiO 2 10.14% V 2 O 5 0.546%, mnO0.270%, bulk specific gravity 2.16t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The low silicon lump ore comprises the following components: TFe65.34%, siO 2 3.83％、CaO0.030％、Al 2 O 3 、1.08％、MgO0.010％、TiO 2 0.010％，V 2 O 5 0.030%, mnO0.199%, bulk specific gravity 2.30t/m 3 。
The coke comprises the following chemical components: c85.32%, ash 13.76%, bulk specific gravity 0.63t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The total analysis components of the coke ash are as follows: siO (SiO) 2 53.868％、CaO2.985％、Al 2 O 3 24.538％、MgO0.175％、TiO 2 1.53%, mnO0.39%; the chemical components of the pulverized coal are as follows: 77.75% of C, 10.51% of ash, 13.40% of volatile matters and 69% of fineness (-200 meshes); the ash content of the injected pulverized coal is analyzed completely and the chemical components are as follows: siO (SiO) 2 47.739％、CaO5.365％、Al 2 O 3 22.88％、MgO2.31％、TiO 2 1.39％、MnO0.390％。
In the embodiment, the grade of the sintering ore and ash content of the coke coal powder are changed, and the nuclear material is firstly prepared according to the step A method. Core material edge data: ore batch: 33000kg, 7676kg (dry basis 7369 kg) and 500kg (dry basis 480 kg) of coke batch (wet basis) (note: the coke batch is adjusted according to the raw fuel components and the grade after primary batching, clinker ratio). Batching reference: w ([ Si ]) value: 0.160%; and the basicity of the slag is 1.14. The standard material speed is 8.96 batches/h, and the standard coal quantity is 21648kg/h (note: the adjustment is needed according to the ash component change condition of the pulverized coal). And after the adjustment of the coke batch and the hour coal amount, checking and adjusting according to the batching result (according to the target slag alkalinity).
And (3) proportioning and core material results:
61.50 percent (20.5 percent+20.5 percent) of sintered ore, 3.0 percent of sintered small-grain ore, 15.0 percent of vanadium-titanium pellet ore (1), 19.0 percent of vanadium-titanium pellet ore (2) and 1.50 percent of low-silicon lump ore. Comprehensive charging grade TFe:53.14%.
In this example, the main parameters of the raw fuel are beyond the stable range (clinker rate is reduced by 0.50%, comprehensive charging grade is reduced by 0.26% > + -0.20%, coke ash content is raised by 0.13% and coal ash content is raised by 0.05%), and the reference operating parameters are adjusted according to the change amplitude condition (including the determination of the coal quantity and coke batch in reference hours after the raw fuel is changed):
the method comprises the following steps of: determining the hourly coal amount after factor change, calculating the theoretical iron amount of batch materials, the theoretical coal ratio, the new coke ratio and the coke-to-butyl ratio, determining the new coke batch materials, the theoretical fuel ratio of the batch materials with condition change, the utilization coefficient, the smelting period, the coal injection rate and the like (see tables 25-30 for details).
The concept and the calculation formula involved in the calculation process are the same as those of application example 1.
(1) Calculating theoretical fuel ratio, utilization coefficient, smelting period and the like after condition change
According to the B2 calculation method and the steps, the obtained dry Jiao Pichong of the raw fuel after the condition change is 7378 kg/batch and the hour coal amount is 21648kg/h on the basis of basic parameters. Corresponding theoretical index changes: the calculated theoretical fuel ratio is 559.11kg/t (dry basis); the utilization coefficient is 3.66 t/(m) 3 D) a step of (d); the smelting cycle was 42.1 batches (tables 25 and 26).
Table 25 shows the index check after the raw fuel change (comparative base condition)
Table 26
Note that: the target (alkalinity) of the coke batch and the hour coal is checked to reach the target after the adjustment, and the burden proportion of the furnace burden structure is maintained.
(2) Adjusting the structural proportion of furnace burden, coke batch, slag iron components output after the coal quantity of hours and related intermediate process results according to the change of the raw fuel condition
In units of each batch of material, the (w ([ Si ])-Si reduction ratio, w ([ Si ]) -Ti reduction ratio, w ([ Si ]) -Mn reduction ratio, w ([ Si ]) -V reduction ratio, and w ([ Si ]) -desulfurization ratio fitting relation, and the [ S ] removal ratio and the predetermined w ([ Si ]) fitting polynomial obtained by the reduction ratio of the elements [ Si ], [ Ti ], [ Mn ], [ V ] and the like under the predetermined w ([ Si ]) value condition in the molten iron are obtained by fitting (the foregoing (FIGS. 3 to 7).
In the same manner as in step B1, the slag amount (slag ratio), alkali metal, zinc, titanium, sulfur load, etc., as well as theoretical slag components (including basicity, magnesium-aluminum ratio, etc.), theoretical pig iron components (tables 27 to 30) after the change of the raw fuel were outputted.
Table 27 obtains the reduction ratio corresponding to the reference w ([ Si ]) from the fitting relation between the value of w ([ Si ]) and the reduction ratio of each element
Note that: reference w ([ Si ]) is input, and the others are automatic calculation outputs.
Table 28 shows the ratio of the change, the slag amount (slag ratio) at the reference w ([ Si ]), the alkali metal, zinc and titanium, and the sulfur load
| Project | Slag quantity | Slag ratio | K load | Na load | Zn load | S load | Ti load | Basicity of slag |
| Unit (B) | Kg/pi | Kg/t | Kg/t | Kg/t | Kg/t | Kg/t | Kg/t | Multiple times |
| Reference condition | 8768 | 475 | 2.60 | 1.21 | 0.41 | 3.97 | 40.22 | 1.14 |
| Raw material variation | 8748 | 476 | 2.62 | 1.14 | 0.41 | 3.95 | 40.76 | 1.14 |
Table 29 shows the theoretical pig iron composition at the reference w ([ Si ]) after the change of the raw fuel
| Project | Si | S | P | Ti | As | V | Mn |
| Unit (B) | ％ | ％ | ％ | ％ | ％ | ％ | ％ |
| Reference condition | 0.16 | 0.057 | 0.071 | 0.204 | 0.032 | 0.165 | 0.236 |
| Raw material variation | 0.16 | 0.055 | 0.072 | 0.207 | 0.018 | 0.165 | 0.196 |
Table 30 shows the theoretical slag composition at the reference w ([ Si ]) after the change of the raw fuel
The correction air volume multiple is the same as that in the step B1 (1.23 times).
In the smelting process, the speed of the reference material is changed frequently, and the control is carried out by combining with an oxygen regulating material to enter the step C.
C. The adjustment amount of the input pulverized coal injection is used for precisely controlling w ([ Si ]) and the iron slag component
The method comprises the steps of setting w ([ Si ]) in the smelting process of the blast furnace according to the steps, adjusting the coal injection quantity in an hour to accurately pre-control the w ([ Si ]), and carrying out checking and analysis by combining the actual w ([ Si ]) obtained after the adjustment reaction.
According to the definition principle (Shan Lutie times (prescribing the absolute value of w ([ Si ]) and actual w ([ Si ]) and 0.05 percent point) of checking the adjustment quantity of the pulverized coal injection, according to the above, whether the adjustment quantity of the pulverized coal injection is used for accurately controlling the w ([ Si ]) and the slag iron component for the value of the molten iron w ([ Si ]) of the blast furnace under the first and second groups of furnace materials conditions is carried out.
(1) Parameters (including calculated indirect smelting parameters and fuel parameters) which need to be collected. The comprehensive air supply parameters obtained by direct collection comprise: the surface air quantity, humidity, wind pressure, top pressure, wind temperature, air port area and the like; the indirect smelting parameters (automatic calculation) include corrected air volume obtained according to the table-actual air volume correction coefficient (or fitting polynomial), and oxygen enrichment rate, theoretical combustion temperature, air permeability index, blast kinetic energy, check and the like after correcting the air volume (table 31-table 33). The fuel parameters that need to be collected include: the batch weight, the components and the front air port burning rate of coke and diced coke; the hourly pulverized coal amount, pulverized coal components and the tuyere front combustion rate. In addition, the real-time hour coal amount is collected in real time and automatically accumulated to the hour.
(2) And determining the adjustment amount of the pulverized coal injection and precisely controlling the amount of molten iron w ([ Si ]).
The output results (tables 31 to 33) were calculated according to the principle of whether to adjust the molten iron w ([ Si ]) value and the determination step of the pulverized coal injection adjustment (original pulverized coal injection amount → pulverized coal injection adjustment amount (input) → new hour coal amount → theoretical material speed (ton coal consumption air volume, hour coal consumption air volume, ton coke consumption air volume, residual air volume after coal burning obtained by combining the comprehensive blast parameters and the fuel parameters in step (1)), the pulverized coal adjustment amount influence w ([ Si ]) amount → estimated w ([ Si ]) pulverized coal adjustment effect determination).
The concepts, computing methods and formulas involved are the same as in application example 1. And (3) calculating and outputting: the results and process parameters obtained in this example are shown in tables 31-33 operating with two natural shifts of data).
TABLE 31 coal blending definition and coal blending accurate control of molten iron w ([ Si ]) amount data acquisition (calculation) and process, effect
Table 32
/>
/>
Table 33
/>
Note that: the plan w ([ Si ]) and the range are: 0.16% +/-0.05%, wherein the absolute value of the difference between the actual value and the planned value exceeds 0.05 percent, namely, the actual value w ([ Si ]) is adjusted, and the actual value w ([ Si ]) of the previous furnace is filled in the non-reaction period of the adjustment; and during the period that the coal quantity is not completely reacted in the previous coal quantity adjustment, the next coal powder injection adjustment is not performed.
The molten iron w ([ Si) after coal blending is compared]) Value of tapping w ([ Si)]) Actual practice is that of The control effect (reflected 3.5 hours after the coal blending amount) according to the falling time of the adjustment factors: the effect of this example was achieved (first natural shift coal 1 time (w ([ Si)]) The absolute value of the deviation is 0.052 percentage points, the adjustment principle is satisfied), the second natural shift is carried out for 1 time (w ([ Si)]) The absolute value of the deviation is 0.054 percentage points, the adjustment principle is satisfied), and w ([ Si)]) The control effect is further that the input hour coal quantity adjustment quantity reaches the requirement, and the error check (the absolute value of the fluctuation of the fuel ratio under the condition of error and unified raw fuel) is carried out according to the theoretical fuel ratio obtained after coal adjustment and the planned required fuel ratio<5 kg/t) to reach the next cycle. Step C3 is entered. And C3, entering the next period after the step C3.
The situation that the furnace condition is smooth and the theoretical material speed is different from the actual material speed by more or less than 1.0 batch/h does not occur.
C3, predicting and pre-controlling slag iron components after adjusting and blowing coal powder to accurately control w ([ Si ]) and checking the effect of adjusting coal quantity to accurately control w ([ Si ])
(1) The iron slag component is obtained and checked by using the obtained pre-control w ([ Si ]) value.
From the above, w ([ Si ] is estimated after the input hour pulverized coal amount reaches the reaction period]) It is expected that The values were added to the values obtained above (fitting relation obtained in step B) (w ([ Si)]) Si reduction ratio, w ([ Si)]) -Ti reduction ratio, w ([ Si)]) Mn reduction ratio, w ([ Si)]) V reduction Rate, w ([ Si)]) In the fitting relation of the desulfurization rate, w ([ Si) in the furnace molten iron is obtained])、w([S])、w([P])、w(Ti])、w([As])、w([V]) Theoretical calculated values such as w (Mn); further, w (SiO) in the furnace slag is obtained 2 )、w(CaO)、w(MgO)、w(Al 2 O 3 )、w(TiO 2 )、w(V 2 O 5 ) Theoretical calculation values of w (MnO) and the like (step (1) in B1).
Further, the obtained iron slag composition was checked: will pre-control w ([ Si)]) It is expected that Values and other w ([ S)])、w([P])、w(Ti])、w([As])、w([V]) Pig iron components such as w (Mn) and the like and the normal state of the tapping iron sample in the corresponding time (the end of the coal-adjusting reaction period)Sampling, analyzing, comparing and checking by a standard method; will pre-control w ([ Si)]) It is expected that Under the value condition, w (SiO) in other slag is obtained 2 )、w(CaO)、w(MgO)、w(Al 2 O 3 )、w(TiO 2 )、w(V 2 O 5 ) Slag components such as w (MnO) and the like are compared and checked with a conventional method for sampling, analyzing and checking slag samples in a corresponding time (focusing and coal adjusting reaction period is finished) (tables 34 and 35).
Table 34 coal-adjusting and pre-controlling w ([ Si ]) value (adjusting time hit furnace) to obtain slag iron component, and checking and process and effect
/>
Table 35
/>
Checking results: in the embodiment, the value of w ([ Si ]) is adjusted to achieve the effect (the first natural shift is used for adjusting coal 1 time, the second natural shift is used for adjusting coal 1 time), the control effect of w ([ Si ]) (the value of molten iron w ([ Si ])) is achieved, and other slag iron pre-control components are all in the required range.
(2) Checking the average w ([ Si ]) and daily theoretical index of the example
The average w ([ Si ]) value, daily theoretical coal ratio, coke ratio and daily actual coal ratio, and the daily theoretical yield and daily actual yield calculated according to the theoretical material speed are compared and checked (Table 36) to reach the required range. The concept, calculation method and formula of the theoretical yield and theoretical index are the same as those of application example 1. The following are provided:
the theoretical fuel ratio fluctuation within + -5 kg/t under the same raw fuel condition is reflected in the operation process.
Table 36 comparison of the average theoretical value and the actual value, check
/>
D. According to the previous steps (preliminary checking of blast furnace conditions, focusing and batch (containing coke butyl), oxygen and material adjustment, coal and temperature adjustment), the adjusted raw fuel and smelting parameters are fed into a furnace, and smelting parameter adjustment is controlled: the method comprises the steps of accurately controlling the material speed, accurately controlling the w ([ Si ]) (the molten iron w ([ Si ])) value, controlling and calculating the iron slag component, performing index real-time theoretical prediction and pre-control, and smelting according to the material sequence when the flow defining conditions of all steps meet the requirements and are within the error range.
Smelting in a furnace and controlling parameters:
d1, feeding the sum of the four ores A to a blast furnace according to the conventional amount, wherein the sum of the four ores A is 100 percent (titanium slag smelting in vanadium titanium ore in the example), and coke with higher ash content and sulfur content (containing coke butyl); after checking the state of the blast furnace condition, under the conditions of constant air temperature, full air and oxygen regulating materials, quantitative coal regulation is adopted to accurately control the molten iron w ([ Si) ]) The value "the number of times of pulverized coal amount per hour of each shift is less than or equal to 3 times (the first natural shift is adjusted for 1 time and the second natural shift is adjusted for 1 time in the example), and the molten iron |day theoretical control w ([ Si ] is realized]) Predicted value -Japanese specification w ([ Si)]) Actual value |<0.05 percentage points per day (in this example-0.004 percentage points).
D2, smelting under the following conditions:
the example is the smelting of titanium slag in vanadium titanium ore, and the parameter smelting range is as follows: the hot air pressure is 0.331-0.344 MPa (full air), the top pressure is 0.159-0.170 MPa, the hot air temperature is 1170 ℃ (top air temperature), and the furnace air inlet volume (corrected) is 3275-3342 m 3 Per min, the oxygen enrichment is 10508-11308 m 3 The pulverized coal injection amount is 138-142 kg/t iron (the raw fuel analysis exceeds the prescribed variation for 1 time, and the coal injection rate is 24.0-26.0%); 33.0 tons of ore batch, 7.369 to 7.378 tons of coke batch (dry basis); 0.48 ton of diced coke (dry basis); w ([ Si)]) 0.117 to 0.214 percent (vanadium titanium ore smelting), 1.13 to 1.15 percent of slag alkalinity and 1441 to 1460 ℃ of molten iron temperature. Are all within a prescribed range.
The present example adjusts focus batches according to defined principles and methods. The effect of this adjustment reflects a time of 1 smelting cycle.
In this example, the amount of pulverized coal injected in an hour (the amount of fine adjustment of molten iron w ([ Si ]) was adjusted 2 times in 2 natural shifts, the amount of adjustment of the amount of pulverized coal injected in an hour was < 5.0% of the total amount of pulverized coal injected in an original hour, and the effective reaction time of the adjustment was 3.5 hours.
The falling time reflected by the adjusting effect is automatically found to be the function solution.
The effect completion time of the above influencing factors is respectively as follows: the charging grade, the slag alkalinity, the clinker rate and the top pressure are all one smelting period (4.5-5.5 hours, automatic calculation), the pulverized coal is injected for 3.5 hours, and the air quantity, the air temperature and the humidity are 1 hour. The adjusting node is used for changing corresponding influencing factors and conforming to the acting time of the adjusting factors so as to maintain the relative stability of the comprehensive fuel ratio, wherein the absolute value of the deviation amount of the same raw fuel condition (when the adjustment of the coke batch is not needed) is less than 5 kg/t.
D3, smelting under the following conditions:
in the actual smelting process, the slag ratio is 475-476 kg/t, the magnesium-aluminum ratio in the slag is 0.859-0.870, the slag alkalinity is 1.13-1.15, the constant air temperature is 1170 ℃, the oxygen enrichment rate (after correcting the air quantity) is 3.90-4.25%, and the air permeability index is 18529-19096 m 3 The temperature of theoretical combustion is 2360-2375 ℃, the actual blowing speed is 261-269 m/S, the actual blowing kinetic energy (after air quantity correction) is 16321-17551 kg.m/S, and the theoretical hour material speed is 8.71-8.96 batch/h.
When the oxygen regulating material and the coal regulating temperature are used, except that the obtained deviation value accords with the requirement range of the material speed and the silicon deviation, the direct smelting parameters such as air quantity, air pressure, top pressure and the like are all in the range, and the indirect smelting parameters such as air permeability index, theoretical combustion temperature, blast kinetic energy and the like obtained through automatic calculation are all in the range. Vanadium titanium ore smelting blast furnace w ([ Si) ]) Lower limit of the value, w (MgO)/w (Al) 2 O 3 ) The value takes the upper limit.
The actual smelting result of the method is returned and corrected, and the control requirements of hour theory and actual material speed, theoretical calculation control and actual w ([ Si ]) value, theoretical slag iron component and actual slag iron component, theoretical and actual tapping yield (daily average), theoretical and actual fuel ratio comparison and check are all achieved. Related parameters do not need to be changed or corrected.
The respective step concepts, calculation steps and methods are the same as those of application example 1.
Application example 3
A. The material is of a common ore furnace burden structure, and comprises sinter ore, 2 kinds of high silicic magnesium oxide pellets and low silicon lump ore. And (5) performing reference batching and checking:
the chemical components of the sinter are as follows: TFe53.66%, siO 2 5.85％、CaO13.31％、Al 2 O 3 1.77％、MgO2.32％、TiO 2 0.46％、S 0.045％、V 2 O 5 0.142%, mnO0.129%, bulk specific gravity of 2.03t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The acidic magnesia pellet comprises the following components: TFe59.14%, siO 2 6.87％、CaO0.073％、Al 2 O 3 1.84％、MgO1.02％、TiO 2 2.88％、V 2 O 5 0.145%, mnO0.097%; bulk specific gravity 2.29t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The low silicon lump ore comprises the following components: TFe65.98%, siO 2 6.62％、CaO0.20％、Al 2 O 3 1.336％、MgO0.05％、TiO 2 0.093％，V 2 O 5 0.030%, mnO0.129%, bulk specific gravity 2.30t/m 3 。
The coke comprises the following chemical components: c84.24%, ash 14.49%, bulk specific gravity 0.65t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The total analysis components of the coke ash are as follows: siO (SiO) 2 56.836％、CaO2.284％、Al 2 O 3 25.256％、MgO0.75、TiO 2 1.55%, mnO0.39%; the chemical components of the pulverized coal are as follows: c76.58%, ash content 11.52%, volatile 13.44%, fineness (-200 mesh) 71%; the ash content of the injected pulverized coal is analyzed completely and the chemical components are as follows: siO (SiO) 2 57.245％、CaO5.334％、Al 2 O 3 24.17％、MgO2.307％、TiO 2 1.553％、MnO0.390％。
Benchmark conditions and core results:
ore batch: 54000kg, 10800kg (dry basis 10470 kg), 700kg (dry basis 680 kg). Batching reference: reference: w ([ Si ]) value: 0.280%; slag basicity 1.17. The reference material speed is 9.09 batches/h, and the reference coal quantity is 46915kg/h.
And (3) proportioning and core material results:
69 percent of sintered ore (23% +23% + 23%), 24.2 percent of acid magnesia pellet ore (12.1% + 12.1%), and 6.80 percent of low-silicon lump ore. Comprehensive charging grade TFe:55.69%.
B. Checking and analyzing ingredients, parameters and indexes
B1, reference ingredients calculation, parameter and index checking analysis:
the blast furnace is conventionally used in mineral batches and coke batches, and the chemical components (total analysis) of various materials are as in step A. And (3) under the condition of main reference parameters (clinker rate, comprehensive furnace charging grade, coke and pulverized coal ash) of the standard raw fuel, combining the standard operation parameters (standard coal quantity, standard material speed and standard w ([ Si ])) of the step A: the reference operation parameters such as the total wind (wind pressure, wind quantity), wind temperature, w ([ Si ]) are not adjusted.
Under the reference condition of the step A (seen as that the parameters of main raw fuel are stable (the fluctuation range is satisfied with the clinker rate < +/-1.0%, the comprehensive charging grade < +/-0.20%, the coke < +/-0.1% and the ash content of coal dust < +/-0.10%), the method directly enters the reference index determining step, and is carried out according to the following steps:
(1) Calculating theoretical fuel ratio, utilization coefficient, smelting period and the like under basic conditions
The calculated theoretical fuel ratio is 515.71kg/t (dry basis); the utilization coefficient is 2.763 t/(m) 3 D) a step of (d); the smelting cycle was 58.6 batches (tables 37 and 38).
Table 37 calculates the basic conditions and checks the basic indexes thereof
Table 38
(2) Delivering slag iron component and related intermediate process result according to reference conditions (all of the change amount of raw fuel is within the required range)
In each batch, the reduction rates of elements such as [ Si ], [ Ti ], [ Mn ], [ V ] and the like in the molten iron under the condition of a preset value of w ([ Si ]) are obtained by fitting the reduction rates of the elements such as w ([ Si ]) -Si reduction rate, w ([ Si ]) -Ti reduction rate, w ([ Si ]) -Mn reduction rate and w ([ Si ]) -V reduction rate, and the fitting relation of the w ([ Si ]) -desulfurization rate and the preset value of w ([ Si ]) are as follows (figures 8-12):
the amounts of the corresponding element oxides and S, P, as in the molten iron were calculated from the reduction ratios (desulfurization ratios, and [ P ], [ As ] reduction ratios of 100%, etc.) of the above elements in combination with the material balance, and the amounts of the respective element oxides and S, P, as in the slag were further calculated, and the output slag amounts (slag ratio), alkali metals, lead-zinc and titanium, sulfur loads, etc., as well As theoretical slag components (including basicity, magnesium-aluminum ratio, etc.), theoretical pig iron components (calculated from the theory of the corresponding element oxides in the molten iron) (tables 39 to 42).
Table 39 obtains the reduction rate corresponding to the reference w ([ Si ]) from the fitting relation between the value of w ([ Si ]) and the reduction rate of each element
Note that: reference w ([ Si ]) is input, and the others are automatic calculation outputs.
Table 40 shows the reference proportions, the slag amount (slag ratio) at reference w ([ Si ]), the alkali metal, lead zinc and titanium, and the sulfur load
| Project | Slag quantity | Slag ratio | K load | Na load | Zn load | S load | Ti load | Basicity of slag |
| Unit (B) | Kg/pi | Kg/t | Kg/t | Kg/t | Kg/t | Kg/t | Kg/t | Multiple times |
| Numerical value | 12780 | 404 | 2.65 | 1.09 | 0.79 | 3.41 | 11.08 | 1.17 |
Table 41 outputs the theoretical pig iron composition at reference w ([ Si ])
Table 42 outputs theoretical slag composition at reference w ([ Si ])
In this example, the corrected air volume was calculated, and the air volume corrected by the actual fuel consumption (the cumulative average value of sampling was 5606.18m 3 The/min) and the corresponding air volume (the sampling cumulative average value is 4523.11 m) 3 The/min) is stable, and the value of the ratio is 1.23-1.25, wherein the ratio of the corrected air quantity to the meter air quantity is converted into the ratio of the corrected air quantity to the meter air quantity= 5606.18/4523.11 =1.24.
And B2, when main reference parameters (clinker rate, comprehensive furnace charging grade, coke ash and pulverized coal ash) of the basic raw fuel are changed beyond a stable range, entering a step B.
B2, batch calculation, parameter and index check analysis of main check conditions (clinker rate, comprehensive furnace charging grade, coke and pulverized coal ash) change:
A change in the raw fuel composition is detected. Wherein:
1 st material change:
the chemical components of the sinter are as follows: TFe53.36%, siO 2 5.73％、CaO13.13％、Al 2 O 3 1.75％、MgO2.177％、TiO 2 0.526％、S 0.042％、V 2 O 5 0.029%, mnO0.115%, bulk specific gravity of 2.02t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The acidic magnesium oxide pellets comprise the following components: TFe59.37%, siO 2 6.756％、CaO0.77％、Al 2 O 3 1.785％、MgO0.925％、TiO 2 2.75％、V 2 O 5 0.137%, mnO0.053%; bulk specific gravity 2.30t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The low silicon lump ore comprises the following components: TFe65.34%, siO 2 3.83％、CaO0.030％、Al 2 O 3 、1.08％、MgO0.010％、TiO 2 0.010％，V 2 O 5 0.030%, mnO0.199%, bulk specific gravity 2.30t/m 3 。
The coke comprises the following chemical components: c85.05%, ash 14.31%, bulk specific gravity 0.63t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The total analysis components of the coke ash are as follows: siO (SiO) 2 、55.868％、CaO2.985％、Al 2 O 3 24.538％、MgO0.553％、TiO 2 390%, mnO0.39%; the chemical components of the pulverized coal are as follows: 77.62% of C, 11.27% of ash, 13.22% of volatile matters and 72% of fineness (-200 meshes); the ash content of the injected pulverized coal is analyzed completely and the chemical components are as follows: siO (SiO) 2 57.245％、CaO5.475％、Al 2 O 3 23.85％、MgO2.38、TiO 2 1.55％、MnO0.390％。
The material change for the 2 nd time:
the chemical components of the sinter are as follows: TFe53.80%, siO 2 5.73％、CaO13.13％、Al 2 O 3 1.75％、MgO2.21％、TiO 2 0.533％、S 0.04％、V 2 O 5 0.021%, mnO0.104% and bulk specific gravity of 2.05t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The acidic magnesium oxide pellets comprise the following components: TFe59.61%, siO 2 6.536％、CaO0.70％、Al 2 O 3 1.755％、MgO0.859％、TiO 2 2.684％、V 2 O 5 0.143%, mnO0.049%; bulk specific gravity 2.30t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The low silicon lump ore comprises the following components: TFe65.34%, siO 2 3.83％、CaO0.030％、Al 2 O 3 、1.08％、MgO0.010％、TiO 2 0.010％，V 2 O 5 0.030%, mnO0.199%, bulk specific gravity 2.30t/m 3 。
The coke comprises the following chemical components: c85.33%, ash content 14.23%, bulk specific gravity 0.64t/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The total analysis components of the coke ash are as follows: siO (SiO) 2 56.83％、CaO2.286％、Al 2 O 3 25.256％、MgO0.786％、TiO 2 1.55%, mnO0.39%; the chemical components of the pulverized coal are as follows: c77.07%, ash content 11.38%, volatile 13.31%, fineness (-200 mesh) 71%; the ash content of the injected pulverized coal is analyzed completely and the chemical components are as follows: siO (SiO) 2 57.24％、CaO5.48％、Al 2 O 3 23.85％、MgO2.38、TiO 2 1.55％、MnO0.370％。
In the embodiment, the grade of the sintering ore and ash content of the coke coal powder are changed, and the nuclear material is firstly prepared according to the step A method. Core material edge data: ore batch: 54000kg, 10800kg (dry basis 10470 kg) and 700kg (dry basis 680 kg) of coke batch (wet basis) (note: the coke batch is adjusted according to the raw fuel components and the grade after primary batching, clinker ratio).
Batching reference: w ([ Si ]) value: 0.280%; and the basicity of the slag is 1.14. The reference material speed is 9.09 batches/h, and the reference coal quantity is 46915kg/h (note: the adjustment is needed according to the ash component change condition of the pulverized coal). And after the adjustment of the coke batch and the hour coal amount, checking and adjusting according to the batching result (according to the target slag alkalinity).
And (3) proportioning and core material results:
material change 1: 67.5 percent of sintered ore (22.5 percent+22.5 percent), 24.10 percent of acid magnesia pellet ore and 8.4 percent of low-silicon lump ore. Comprehensive charging grade TFe:55.70%.
Material changing 2: 68.1 percent of sintered ore (22.7 percent+22.7 percent), 24.20 percent of acid magnesia pellet and 7.7 percent of low-silicon lump ore. Comprehensive charging grade TFe:55.99%.
In this example, variant 1: the main parameters of the raw fuel are beyond the stable range (the clinker rate is reduced by 1.6 percent to +/-1.0 percent, the comprehensive charging grade is increased by 0.001 percent, the coke ash is reduced by 0.18 percent to +/-0.1 percent, and the pulverized coal ash is reduced by 0.25 percent to +/-0.1 percent); material changing 2: the main parameters of the raw fuel are beyond the stable range (the clinker rate rises by 0.70 percent, the comprehensive charging grade rises by 0.29 percent to +/-0.20 percent, the coke ash drops by 0.08 percent, and the ash content of the pulverized coal rises by 0.11 percent to +/-0.1 percent). The reference operation parameters are adjusted according to the change amplitude conditions (including the determination of the reference hour coal quantity and coke batch after the change of the raw fuel):
Respectively (2 times of material changing) calculating according to the step sequence: determining the hourly coal amount after factor change, calculating the theoretical iron amount of batch materials, the theoretical coal ratio, the new coke ratio and the coke-to-butyl ratio, determining the new coke batch materials, the theoretical fuel ratio of the batch materials with condition change, the utilization coefficient, the smelting period, the coal injection rate and the like (see tables 43-48 for details).
The concept, the calculation method and the formula related in the calculation process are the same as those of application example 1.
(1) Calculating theoretical fuel ratio, utilization coefficient, smelting period and the like after condition change
The results of the variables 1 and 2 are shown in tables 43 and 44.
Table 43 shows the results of the calculation of the raw fuel change (comparative base conditions) and the verification of the index thereof
Table 44
Note that: the target (alkalinity) of the coke batch and the hour coal is checked to reach the target after the adjustment, and the burden proportion of the furnace burden structure is maintained.
(2) Adjusting the structural proportion of furnace burden, coke batch, slag iron components output after the coal quantity of hours and related intermediate process results according to the change of the raw fuel condition
After the material is changed (each time), the material is used as a unit, and the values of the reduction rates of elements such as [ Si ], [ Ti ], [ Mn ], [ V ] and the like in the molten iron are obtained by fitting the reduction rates of the elements such as (w ([ Si ]) -Si reduction rate, w ([ Si ]) -Ti reduction rate, w ([ Si ]) -Mn reduction rate and w ([ Si ]) -V reduction rate, and the fitting relation of the w ([ Si ]) -desulfurization rate, and the fitting polynomial of the removal rate and the preset w ([ Si ]) in the molten iron are as shown in the foregoing (figures 8-12).
In the same manner as in step B1, the slag amount (slag ratio), alkali metal, zinc, titanium, sulfur load, etc., as well as theoretical slag components (including basicity, magnesium-aluminum ratio, etc.), theoretical pig iron components (tables 45 to 48) after the change of the raw fuel are outputted.
Table 45 obtains the reduction rate corresponding to the reference w ([ Si ]) from the fitting relation between the value of w ([ Si ]) and the reduction rate of each element
Note that: reference w ([ Si ]) is input, and the others are automatic calculation outputs.
Table 46 shows the ratio of the change, the slag amount (slag ratio) at the reference w ([ Si ]), the alkali metal, zinc and titanium, and the sulfur load
Table 47 shows the theoretical pig iron composition at the reference w ([ Si ]) after the change of the raw fuel
Table 48 shows the theoretical slag composition at the reference w ([ Si ]) after the change of the raw fuel
The correction air volume multiple is the same as that in the step B1 (both are 1.24 times).
In the smelting process, the speed of the reference material is changed frequently, and the control is carried out by combining with an oxygen regulating material to enter the step C.
C. The adjustment amount of the input pulverized coal injection is used for precisely controlling w ([ Si ]) and the iron slag component
The method comprises the steps of setting w ([ Si ]) in the smelting process of the blast furnace according to the steps, adjusting the coal injection quantity in an hour to accurately pre-control the w ([ Si ]), and carrying out checking and analysis by combining the actual w ([ Si ]) obtained after the adjustment reaction.
According to the definition principle (Shan Lutie times (prescribing the absolute value of w ([ Si ]) and actual w ([ Si ]) and 0.05 percent point) of checking the adjustment quantity of the pulverized coal injection, according to the above, whether the adjustment quantity of the pulverized coal injection is used for accurately controlling the w ([ Si ]) and the slag iron component for the value of the molten iron w ([ Si ]) of the blast furnace under the first and second groups of furnace materials conditions is carried out.
(1) Parameters (including calculated indirect smelting parameters and fuel parameters) which need to be collected. The comprehensive air supply parameters obtained by direct collection comprise: the surface air quantity, humidity, wind pressure, top pressure, wind temperature, air port area and the like; the indirect smelting parameters (automatic calculation) include corrected air volume obtained from the table-actual air volume correction coefficient (or fitting polynomial), and oxygen enrichment rate, theoretical combustion temperature, air permeability index, blast kinetic energy, check and the like after correcting the air volume (tables 49 to 51). The fuel parameters that need to be collected include: the batch weight, the components and the front air port burning rate of coke and diced coke; the hourly pulverized coal amount, pulverized coal components and the tuyere front combustion rate. In addition, the real-time hour coal amount is collected in real time and automatically accumulated to the hour.
(2) And determining the adjustment amount of the pulverized coal injection and precisely controlling the amount of molten iron w ([ Si ]).
Calculating an output result according to a principle of whether to adjust the molten iron w ([ Si ]) value and a determination step of the pulverized coal injection adjustment amount (original pulverized coal injection amount → pulverized coal injection adjustment amount (input) → new hour coal amount → theoretical material speed (ton coal consumption air quantity, hour coal consumption air quantity, ton coke consumption air quantity and residual air quantity after coal burning obtained by combining the comprehensive blowing parameters and the fuel parameters in the step (1)), the pulverized coal adjustment amount influences w ([ Si ]) amount → estimated w ([ Si ]) amount after pulverized coal adjustment, and coal adjustment effect judgment).
The concepts, methods and formulas involved are the same as in application example 1.
Index, etc. (to correct the air volume to bring into the conventional calculation formula).
The results and process parameters obtained in this example are shown in tables 49 to 51 (data and operations in three natural classes).
Table 49 coal blending definition and coal blending accurate control molten iron w ([ Si ]) amount data acquisition (calculation) and process, effect
/>
Table 50
/>
/>
Table 51
/>
/>
Note that: the plan w ([ Si ]) and the range are: 0.16% +/-0.05%, wherein the absolute value of the difference between the actual value and the planned value exceeds 0.05 percent, namely, the actual value w ([ Si ]) is adjusted, and the actual value w ([ Si ]) of the previous furnace is filled in the non-reaction period of the adjustment; and during the period that the coal quantity is not completely reacted in the previous coal quantity adjustment, the next coal powder injection adjustment is not performed.
The molten iron w ([ Si) after coal blending is compared]) Value of tapping w ([ Si)]) Actual practice is that of The control effect (reflected 3.5 hours after the coal blending amount) according to the falling time of the adjustment factors: the adjustment of this example achieves the effect (the first natural shift coal adjustment 1 time (adjustment time w ([ Si)]) The absolute value of deviation is 0.060 percent, which meets the adjustment principle, and the adjustment is not carried out before the last adjustment is carried out, the second natural shift is carried out for adjusting the coal 1 time (w ([ Si ] when adjusting)]) The absolute value of deviation is 0.060 percent, which meets the adjustment principle, and the adjustment is not carried out before the last adjustment is carried out, the third natural shift is carried out for adjusting the coal 1 time (w ([ Si ] when adjusting) ]) The absolute value of the deviation is 0.070 percent, the adjustment principle is satisfied, no adjustment is performed before the last adjustment is carried out), and w ([ Si)]) Control effect, further, the input hour coal quantity adjustment quantity reachesThe requirement is that error check is carried out according to the theoretical fuel ratio obtained after coal adjustment and the planned required fuel ratio (the absolute value of the fluctuation of the fuel ratio under the conditions of error and unified raw fuel)<5 kg/t) to reach the next cycle. Step C3 is entered. And C3, entering the next period after the step C3.
The situation that the furnace condition is smooth and the theoretical material speed is different from the actual material speed by more or less than 1.0 batch/h does not occur.
D3, slag iron component prediction pre-control after adjusting and blowing coal powder to accurately control w ([ Si ]) and coal quantity adjustment to accurately control w ([ Si ]) effect check
(1) The iron slag component is obtained and checked by using the obtained pre-control w ([ Si ]) value.
From the above, w ([ Si ] is estimated after the input hour pulverized coal amount reaches the reaction period]) It is expected that The values were added to the values obtained above (fitting relation obtained in step B) (w ([ Si)]) Si reduction ratio, w ([ Si)]) -Ti reduction ratio, w ([ Si)]) Mn reduction ratio, w ([ Si)]) V reduction Rate, w ([ Si)]) In the fitting relation of the desulfurization rate, w ([ Si) in the furnace molten iron is obtained])、w([S])、w([P])、w(Ti])、w([As])、w([V]) Theoretical calculated values such as w (Mn); further, w (SiO) in the furnace slag is obtained 2 )、w(CaO)、w(MgO)、w(Al 2 O 3 )、w(TiO 2 )、w(V 2 O 5 ) Theoretical calculation values of w (MnO) and the like (step (1) in B1).
Further, 3 furnace reaction times after 3 coal amount adjustment reactions in table 52 hit the heat, and the obtained iron slag composition was checked: will pre-control w ([ Si)]) It is expected that Values and other w ([ S)])、w([P])、w(Ti])、w([As])、w([V]) Sampling, analyzing, comparing and checking pig iron components such as w (Mn) and the like with a conventional method of tapping a sample in a corresponding time (the end of a coal adjustment reaction period); will pre-control w ([ Si)]) It is expected that Under the value condition, w (SiO) in other slag is obtained 2 )、w(CaO)、w(MgO)、w(Al 2 O 3 )、w(TiO 2 )、w(V 2 O 5 ) Slag components such as w (MnO) and the like are checked and checked by sampling analysis and comparison with a conventional method of slag sample tapping in corresponding time (focusing and coal adjusting reaction period is finished) (table 52).
Table 52 coal-adjusting pre-control w ([ Si ]) value (adjustment time hit heat) to obtain slag iron component, and checking and process, effect
/>
Checking results: in this example, the value of w ([ Si ]) is adjusted to achieve the effect (the first natural shift is used for adjusting the coal 1 time, the second natural shift is used for adjusting the coal 1 time, and the third natural shift is used for adjusting the coal 1 time), so that the control effect of w ([ Si ]) (the value of molten iron w ([ Si ])) is achieved, and other slag iron pre-control components are all in the required range.
(3) Checking the average w ([ Si ]) and theoretical indexes of the example
The average w ([ Si ]) value, daily theoretical coal ratio, coke ratio and daily actual coal ratio, and the daily theoretical yield and daily actual yield calculated according to the theoretical material speed are compared and checked (Table 53) to reach the required range. The concept, calculation method and formula of the theoretical yield and theoretical index are the same as those of application example 1.
The theoretical fuel ratio fluctuation within + -5 kg/t under the same raw fuel condition is reflected in the operation process.
Table 53 comparison and check of the average theoretical value and the actual value of this example
D. According to the previous steps (preliminary checking of blast furnace conditions, focusing and batch (containing coke butyl), oxygen and material adjustment, coal and temperature adjustment), the adjusted raw fuel and smelting parameters are fed into a furnace, and smelting parameter adjustment is controlled: the method comprises the steps of accurately controlling the material speed, accurately controlling the w ([ Si ]) (the molten iron w ([ Si ])) value, controlling and calculating the iron slag component, performing index real-time theoretical prediction and pre-control, and smelting according to the material sequence when the flow defining conditions of all steps meet the requirements and are within the error range.
Smelting in a furnace and controlling parameters:
d1, summing the four ores described in A100 percent (titanium slag smelting in vanadium titanium ore in this example) and coke with higher ash content and sulfur content (containing diced coke) are fed into a blast furnace according to the conventional amount; after checking the state of the blast furnace condition, under the conditions of constant air temperature, full air and oxygen regulating materials, quantitative coal regulation is adopted to accurately control the molten iron w ([ Si)]) The value ", the number of times of pulverized coal amount per hour in each shift is less than or equal to 3 (the first natural shift is adjusted for 1 time in this example, the second natural shift is adjusted for 1 time, and the third natural shift is adjusted for 1 time), and the molten iron |day theoretical control w ([ Si ] is realized ]) Predicted value -Japanese specification w ([ Si)]) Actual value |<0.05 percentage points per day (0.006 percentage points in this example).
D2, smelting under the following conditions:
the method is characterized in that the method comprises the steps of intensified smelting of a large-scale blast furnace of common ore, and parameter smelting ranges: the hot air pressure is 0.376-0.385 MPa (full air), the top pressure is 0.184-0.192 MPa, the hot air temperature is 1220 ℃ (top air temperature), and the furnace air inlet volume (corrected) is 5550-5640 m 3 Per min, the oxygen enrichment is 13300-14000 m 3 The pulverized coal injection amount is 157-170 kg/t iron (the raw fuel analysis exceeds the prescribed change for 2 times, and the coal injection rate is 30.98% -31.97%); 54.0 tons of ore batch, 10.399 to 10.470 tons of coke batch (dry basis); 0.68 ton of diced coke (dry basis); w ([ Si)]) 0.21-0.31% (common ore smelting), 1.16-1.18 slag alkalinity, 1440-1480 ℃ of molten iron temperature. Are all within a prescribed range.
The present example adjusts focus batches according to defined principles and methods. The effect of this adjustment reflects a time of 1 smelting cycle.
In this example, the amount of pulverized coal injected in an hour (the amount of fine adjustment of molten iron w ([ Si ]) was adjusted 3 times in 3 natural shifts, the amount of adjustment of the amount of pulverized coal injected in an hour was < 5.0% of the total amount of pulverized coal injected in an original hour, and the effective reaction time of the adjustment was 3.5 hours. The falling time reflected by the adjusting effect is automatically found to be the function solution.
The effect completion time of the above influencing factors is respectively as follows: the charging grade, the slag alkalinity, the clinker rate and the top pressure are all one smelting period (4.5-5.5 hours, automatic calculation), the pulverized coal is injected for 3.5 hours, and the air quantity, the air temperature and the humidity are 1 hour. The adjusting node is used for changing corresponding influencing factors and conforming to the acting time of the adjusting factors so as to maintain the relative stability of the comprehensive fuel ratio (the absolute value of the deviation of the raw fuel components under the same raw fuel condition (when the adjustment of the coke batch is not needed) is less than 5 kg/t).
D3, smelting under the following conditions:
in the actual smelting process, the slag ratio is 380-410 kg/t, the magnesium-aluminum ratio in the slag is 0.65-0.69, the slag alkalinity is 1.16-1.18, the fixed air temperature is 12500 ℃, the oxygen enrichment rate (after correcting the air quantity) is 2.97-3.15%, and the air permeability index is 28000-3500 m 3 The method comprises the following steps of (1) carrying out (min. MPa), theoretical combustion temperature 2321-2331 ℃, actual blowing speed 273-278 m/S, actual blowing kinetic energy (after air quantity correction) 20000-21500 kg.m/S, and theoretical hour material speed 8.86-9.27 batches/h.
When the oxygen regulating material and the coal regulating temperature are used, except that the obtained deviation value accords with the requirement range of the material speed and the silicon deviation, the direct smelting parameters such as air quantity, air pressure, top pressure and the like are all in the range, and the indirect smelting parameters such as air permeability index, theoretical combustion temperature, blast kinetic energy and the like obtained through automatic calculation are all in the range. Vanadium titanium ore smelting blast furnace w ([ Si) ]) Lower limit of the value, w (MgO)/w (Al) 2 O 3 ) The value takes the upper limit.
The actual smelting result of the example is returned and corrected, and the hour theory and actual material speed, theoretical calculation control and actual w ([ Si ]) value, theoretical slag iron component and actual slag iron component, theoretical and actual tapping yield (daily), theoretical and actual fuel ratio comparison and check all reach the control requirements. Related parameters do not need to be changed or corrected.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A blast furnace smelting method for quantitatively and modularly and precisely controlling w ([ Si ]) by using coal control temperature is characterized by comprising the following steps:
A. and (3) reference batching: the smelting is common ore smelting or medium titanium slag smelting;
when smelting for common ore, the adopted common ore burden comprises the following components in percentage by mass: 65-72% of sintered ore, 20-28% of high-silicic acid pellet ore and 0-10% of low-silicon lump ore; totaling 100%; 53000-5500kg of ore batches;
When smelting medium titanium slag, the adopted vanadium titanium ore furnace burden comprises the following components in percentage by mass: 60-65% of sintered ore, 30-35% of vanadium-titanium pellet ore, 0-5% of low-silicon lump ore and 100% in total; 320000-34000 kg/batch of ore batch;
when common ore smelting or medium titanium slag smelting is carried out, the coke batch is 7200-11000 kg/batch based on the dry basis of coke; the coke butyl batch is 450-700 kg/batch based on the dry basis of coke; the pulverized coal injection amount is 21.5-48.5 t/h;
B. calculating ingredients, checking and analyzing parameters and indexes:
b1, reference ingredients calculation, parameter and index checking analysis:
wind pressure, wind quantity, wind temperature of full windw([Si]The wind temperature is stable at the highest temperature; if the fluctuation range of the factors of common ore smelting or medium titanium slag smelting is all satisfied: clinker rate<1.0 percent of comprehensive charging grade<0.20% of coke ash<0.1% ash content of coal fines<+ -0.10%; then:
(1) Calculating theoretical fuel ratio, utilization coefficient and smelting period;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
(3) Calculating a multiple conversion coefficient of the corrected air quantity and the meter air quantity, wherein the oxygen enrichment rate after the air quantity correction is 2.90-5.00%;
and B2, calculating ingredients, checking parameters and indexes of which main checking conditions change, and analyzing:
Wind pressure, wind quantity, wind temperature of full windw([Si]The wind temperature is stable at the highest temperature; if any one of the factor fluctuation ranges in normal ore smelting or medium titanium slag smelting does not meet the following conditions: clinker rate<1.0 percent of comprehensive charging grade<0.20% of coke ash<0.1% ash content of coal fines<+ -0.10%; then:
(1) Calculating the hour coal quantity, batch theoretical iron quantity, theoretical coal ratio, coke butadiene ratio, coke batch, theoretical fuel ratio, utilization coefficient, smelting period and coal injection rate after factor change;
(2) Calculating theoretical pig iron components, theoretical slag components and alkalinity and magnesium-aluminum ratio;
C. input pulverized coal injection adjustment amount accurate controlw([Si]) Slag iron component:
for stipulatingw([Si]) And actualw([Si]) Performing pre-control deviation check, if Shan Lu iron times are regulatedw([Si]) And actualw([Si]) Absolute value of (2)<0.05 percentage points, and the checking result is that adjustment is not needed; otherwise, the adjustment is needed;
the adjusting method comprises the following steps:
(1) Collecting comprehensive air supply parameters, indirect smelting parameters and fuel parameters;
(2) Inputting the adjustment amount of the pulverized coal injection to adjust the coal on the basis of the original pulverized coal injection amount, so as to obtain the new hour coal amount; then calculating the influence of theoretical material speed and coal dust adjustment through the collected comprehensive air supply parameters, indirect smelting parameters and fuel parameters w([Si]) Amount of pulverized coal and prediction after adjustment of the amount of pulverized coalw([Si]) The amount, then judge the coal-adjusting effect;
the judgment conditions are as follows:
(1) After the coal powder adjustment amount is input, the theoretical prediction influences the subw([Si]) Fluctuation quantity |<0.050%；
（2）|w([Si]) It is expected that -w([Si]) Provision for provision of |<0.03%；
If the conditions 1) to 2) are met simultaneously, and after checking the difference between the actual material speed after coal adjustment and the specified reference material speed, the judgment result is that adjustment is not needed, and w ([ Si ]) control effect check is needed; simultaneously calculating theoretical combustion temperature, blast kinetic energy, air permeability index and smelting period after coal blending;
the specific method for checking the w ([ Si ]) control effect comprises the following steps:
for a pair ofw([Si]) Checking of daily theoretical index, definitionThe standard is: daily theoretical coal ratio, coke ratio, daily actual coal ratio, absolute value error rate of difference between the two<1.50%; if both the two conditions are satisfied, continuing the flow;
D. smelting and parameter control in a furnace:
in the smelting process of charging into the furnace, controlling the pulverized coal amount per hour to be less than or equal to 3 times in each shift, and controlling the theoretical control of molten iron dayw([Si]) Predicted value -Japanese specificationw([Si]) Plan value |<0.05%/day;
smelting conditions are as follows: the hot air pressure is 0.30-0.39 MPa, the top pressure is 0.155-0.195 MPa, the hot air temperature is 1150-1250 ℃, and the corrected furnace inlet air quantity is 3200-5700 m 3 Per min, the oxygen enrichment is 9400-15000 m 3 And/h, the pulverized coal injection amount is 135-165 kg/t iron, and the coal injection rate is 22.0-35.0%; 33.0-55.0 tons of ore batch, 7.2-11.0 tons of coke batch based on dry basis; the amount of the diced coke is 0.45-0.70 ton based on dry basis;w([Si]) 0.055-0.35%, slag alkalinity is 1.10-1.18, and molten iron temperature is 1420-1480 ℃; in the smelting process, the slag ratio is 380-480 kg/t, the magnesium-aluminum ratio in the slag is 0.65-0.95, the slag alkalinity is 1.10-1.18, the controlled air temperature is stable, the oxygen enrichment rate is 2.90% -5.0%, and the air permeability index is 18000-22000 m 3 The theoretical combustion temperature is 2300-2400 ℃, the actual blowing speed is 255-275 m/S, the actual blowing kinetic energy is 17000-22000 kg.m/S, and the theoretical hourly material speed is 8.5-10.0 batches.
2. The coal-regulated temperature quantitative modular precise control w ([ Si) of claim 1]) The blast furnace smelting method is characterized in that the sinter comprises 52.0-54.0% TFe and 5.5-6.5% SiO by mass percent 2 13.0 to 13.5% of CaO, 1.75 to 2.19% of Al 2 O 3 2.30-2.90% MgO, 0.40-1.35% TiO 2 0.045% -0.055% S, 0.165% -0.150% V 2 O 5 0.045% -0.055% MnO, the balance being unavoidable impurities, the bulk specific gravity being 1.90-2.10 t/m 3 ；
The vanadium-titanium pellet comprises 53.5-57.5% of TFe and 4.5-5.5% of SiO by mass percent 2 0.55-1.35% of CaO, 2.20-2.90% of Al 2 O 3 2.35-2.90% MgO, 6.40-11.0% TiO 2 ，0.55~0.7V5% 2 O 5 0.23% -0.25% of MnO, and the balance of unavoidable impurities; bulk specific gravity of 2.20-2.30 t/m 3 ；
The high silicic acid pellet comprises 58.5-60.0% of TFe and 6.5-7.5% of SiO by mass percent 2 0.5-1.5% CaO, 1.80-2.10% Al 2 O 3 1.0-1.5% MgO, 2.50-3.50% TiO 2 V of 0.165-0.150% 2 O 5 0.045% -0.055% MnO, the balance being unavoidable impurities, bulk specific gravity 2.15-2.35 t/m 3 ；
The low-silicon lump ore comprises 64.0-66.0% of TFe and 3.0-4.5% of SiO by mass percent 2 0.03-0.05% of CaO, 1.00-1.50% of Al 2 O 3 MgO, tiO 0.01-1.0% 2 <V1.0%, 0.030-0.050% 2 O 5 0.110% -0.160% MnO, the balance of unavoidable impurities, and bulk specific gravity of 2.2-2.4 t/m 3 。
3. The coal-regulated temperature quantitative modular precise control w ([ Si) of claim 1]) The blast furnace smelting method is characterized in that the coke component comprises, by mass, 84.0-86.5% of C, 13.5-14.5% of ash, and the bulk specific gravity is 0.55-0.65 t/m 3 ；
The coke ash total analysis component comprises 53.0-56.0% of SiO by mass percent 2 2.20 to 3.0 percent of CaO, 24.0 to 26.0 percent of Al 2 O 3 MgO, tiO 0.15-1.0% 2 <2.0%,0.35% -0.45% of MnO, and the balance of unavoidable impurities;
The pulverized coal injection comprises, by mass, 76.0-78.0% of C, 13.5-15.0% of ash, 12.5-13.5% of volatile matters, and the particle size is 66-70% in terms of-200 meshes;
the full analysis component of the ash content of the pulverized coal comprises 55.0-57.0% of SiO by mass percent 2 5.20 to 6.50 percent of CaO, 23.0 to 25.0 percent of Al 2 O 3 MgO and TiO accounting for 2.20-2.50 percent 2 <2.0%,0.35% -0.45% of MnO, and the balance of unavoidable impurities.
4. The method for blast furnace smelting by quantitatively and modularly and precisely controlling w ([ Si ]) according to the coal control temperature of claim 1, wherein the comprehensive air supply parameters comprise: the air quantity, humidity, wind pressure, top pressure, wind temperature and air port area are measured; the indirect smelting parameters comprise corrected air quantity, oxygen enrichment rate after the air quantity is corrected, theoretical combustion temperature, air permeability index and blast kinetic energy; the fuel parameters include the batch weight, the composition and the pre-tuyere burning rate of coke and coke butyl, and the amount of the hour pulverized coal, the composition and the pre-tuyere burning rate of the pulverized coal.
5. The blast furnace smelting method for quantitatively and modularly and precisely controlling w ([ Si ]) by using the coal control temperature according to claim 1, wherein the adjustment amount of the hourly coal injection amount is less than 5.0% of the total amount of the original hourly coal injection amount.
6. The coal-regulated temperature quantitative modular precise control w ([ Si) of claim 1 ]) The blast furnace smelting method is characterized by further comprising the step E of returning and correcting an actual smelting result: e, according to the actual smelting result obtained in the step E, according to theoretical control and actual material speed, theoretical calculation control and actualw([Si]) And C, correcting the calculated parameters according to the calculation methods of the steps B-D, and continuing smelting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211494749.7A CN116516084A (en) | 2022-11-26 | 2022-11-26 | Blast furnace smelting method for quantitatively and modularly and precisely controlling w ([ Si ]) by using coal to regulate temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211494749.7A CN116516084A (en) | 2022-11-26 | 2022-11-26 | Blast furnace smelting method for quantitatively and modularly and precisely controlling w ([ Si ]) by using coal to regulate temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116516084A true CN116516084A (en) | 2023-08-01 |
Family
ID=87405283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211494749.7A Pending CN116516084A (en) | 2022-11-26 | 2022-11-26 | Blast furnace smelting method for quantitatively and modularly and precisely controlling w ([ Si ]) by using coal to regulate temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116516084A (en) |
-
2022
- 2022-11-26 CN CN202211494749.7A patent/CN116516084A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109583118B (en) | Sintering ratio calculation and sinter cost optimization method | |
| CN111100961B (en) | Blast furnace smelting method for rapidly obtaining stable index by interchanging common ore and schreyerite | |
| CN112926820B (en) | Method for diagnosing blast furnace gas flow and improving smelting technical index | |
| CN104164558B (en) | A kind of sintering circuit sinter quality control method | |
| CN111914203B (en) | Calculation method of first tapping time and blast furnace opening method | |
| CN104313214B (en) | A kind of blast furnace quantification modularization accurately controls blow-on, banking, stopping process | |
| CN104862436B (en) | A kind of large blast furnace banking distribution | |
| CN104004876B (en) | A kind of converter charging autocontrol method and system | |
| CN115354093B (en) | Smelting cost control method and system for low-carbon blast furnace | |
| CN108265140A (en) | A kind of blast furnace efficiently arranges zinc method | |
| CN115565618A (en) | Multi-objective optimization method for blast furnace burden, terminal equipment and storage medium | |
| CN106834594B (en) | A kind of method that sulfur bearing steel increases sulphur | |
| CN113626993A (en) | Method for evaluating smelting value of iron ore | |
| CN108197785A (en) | A kind of harmful element is on method for building up of the blast furnace fuel than the computational methods of influence | |
| CN116516084A (en) | Blast furnace smelting method for quantitatively and modularly and precisely controlling w ([ Si ]) by using coal to regulate temperature | |
| CN116676437A (en) | Smelting method for quantitatively and accurately controlling blast furnace burden speed in mode | |
| CN111471818A (en) | Blast furnace production increasing technology for smelting vanadium titano-magnetite | |
| CN113343416B (en) | Method for establishing influence and regulation and control standard of harmful elements on blast furnace smelting | |
| CN113416808B (en) | Method for controlling zinc load of blast furnace | |
| CN113215338B (en) | Blast furnace smelting method capable of accurately controlling components and performance of iron slag | |
| CN112981017A (en) | Pre-iron optimization batching method considering factor change influence | |
| CN113088600B (en) | Method for evaluating integrated benefit of iron ore powder for sintering | |
| CN114694765B (en) | Method for measuring and calculating cost performance of iron ore powder for sintering | |
| Cao et al. | A genetic algorithm application to minimize pig iron cost | |
| CN114381569B (en) | Converter system gas recovery optimization comprehensive evaluation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |