CN113174451A - Control method for pre-loading distribution of blast furnace burden - Google Patents
Control method for pre-loading distribution of blast furnace burden Download PDFInfo
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- 238000009826 distribution Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000000571 coke Substances 0.000 claims abstract description 332
- 239000000463 material Substances 0.000 claims abstract description 78
- 238000002360 preparation method Methods 0.000 claims abstract description 42
- 239000011159 matrix material Substances 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 10
- 239000004744 fabric Substances 0.000 claims abstract description 8
- 238000005303 weighing Methods 0.000 claims description 46
- 239000000446 fuel Substances 0.000 claims description 11
- 239000008188 pellet Substances 0.000 claims description 8
- 239000007858 starting material Substances 0.000 claims description 8
- 239000013585 weight reducing agent Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 abstract description 11
- 239000003034 coal gas Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000003245 coal Substances 0.000 description 8
- 230000001276 controlling effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004260 weight control Methods 0.000 description 1
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- 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
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- 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
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- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/16—Matrix or vector computation, e.g. matrix-matrix or matrix-vector multiplication, matrix factorization
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Abstract
The invention relates to the technical field of pre-loading and material distribution control of blast furnace burden, in particular to a control method for pre-loading and distribution of blast furnace burden. The method specifically comprises the following steps: 1) dividing coke tanks into two categories; 2) dividing the ore tank into two types; 3) to the cloth matrix of any one 4 ~ 8 grades of cloth of present blast furnace, distribute two types of cokes and ore at appointed radial position according to the demand: 4) respectively calculating the total preparation time of the coke and the ore; 5) calculating delay time; 6) the coke pre-loading process comprises the following steps; 7) the ore pre-loading procedure is as follows. The blast furnace burden preassembling technology is provided, coke and sintering furnace burden are classified according to various indexes such as quality, particle size and the like, material flow according to a set sequence and length is formed on a belt through automatic control, and then the material flow is flexibly distributed to the radial position of the blast furnace which is set arbitrarily, so that the furnace burden with different characteristics and performances is distributed to the most reasonable area, and the purposes of blast furnace smooth running and coal gas utilization are improved.
Description
Technical Field
The invention relates to the technical field of pre-loading and material distribution control of blast furnace burden, in particular to a control method for pre-loading and distribution of blast furnace burden.
Background
With the gradual progress of the iron-making process in the last decade and the continuous large-scale of various steel enterprises and blast furnaces. The iron pre-process is continuously improved in coke quality and sintering and pelletizing quality. The coke M40, reactivity index, sintered powder charge rate, tumbler index, and the like have been improved significantly in recent years. On the one hand, however, the coke main coking coal resource is reduced day by day, the share of imported coal is greatly limited, and the like. In the future, the coke quality is difficult to continuously ensure the high cold and hot state indexes due to coal blending. On the other hand, with the deep research on the smelting process of the blast furnace, the effect of coke in the blast furnace is continuously refined in the industry. Different blast furnace sites impose different requirements on the properties of the coke. And then coke production is carried out according to the unified standard, which is not the best choice from the aspects of coal blending cost, coal blending difficulty and production effect.
Meanwhile, sintering and pellet production also face similar problems, and with the progress of the bell-less material distribution technology, a method for realizing stable and reasonable gas distribution of a blast furnace by simply controlling parameters such as a material distribution angle, a ring position angle difference and the like by bell-less equipment has already reached the limit of potential. However, since all the raw materials for bell-less distribution are mixed and all the raw fuels are mixed according to the batch, it is difficult to perform targeted distribution on the raw fuels with different particle sizes and different characteristics, and thus, the problem still has great potential.
The pre-installation technology of the blast furnace burden is urgently developed, the raw fuels with different grain diameters and different quality characteristics are pre-installed to the most reasonable position in a blast furnace weighing tank in advance, then are distributed to the most reasonable position in the radial direction of the blast furnace through a chute, the potential of the distribution in the aspect of improving the energy efficiency of the blast furnace can be further developed by utilizing the optimized combination of different characteristics at different positions, and meanwhile, the coke with the best quality and the best cold and hot strength can be distributed to the most effective position aiming at a main coke coal gap, so that the high yield and the low consumption of the blast furnace can be continuously maintained under the condition that the quality of the coal distribution must be reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a control method for pre-loading distribution of blast furnace burden, which accurately controls the positions of the burden of different levels and distributes the burden in a specific radial area of a blast furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
the blast furnace charge preassembling distribution control method comprises the following steps of loading blast furnace raw fuels with different characteristics and grades into a lower tank of a blast furnace in different sequences, and realizing the preassembly of the blast furnace charge by controlling the relative positions of the raw materials of each grade in the lower tank so as to realize the random combination of the distribution positions of the raw fuels with different characteristics in the radial direction of the blast furnace, wherein the method specifically comprises the following steps:
1) dividing coke tanks into two types, wherein the type 1 is large-particle-size coke, using a coke sieve with a pore diameter of 40mm, the number of the large-particle-size coke tanks is more than or equal to 2, and the number of the coke tanks prepared is less than or equal to 2 at the same time during material preparation; 2, coke with common particle size is used, and a coke sieve with the aperture of 25mm is used; the coke tanks can be classified according to coke cold and hot state indexes or dry and wet cokes, the cokes with good performance are classified into 1 type coke, the cokes with poor performance are classified into 2 types coke, and the coke sieve pore diameters can be the same if the cokes are classified according to the performance;
2) the ore tanks are divided into two types, wherein the type 1 is a large-particle ore tank, and ores with the particle size of 10-30 mm are stored; 2, a small-particle ore tank is used for storing ores with the particle size of 5-10 mm;
3) for any one 4-8-grade distribution matrix of the current blast furnace, two types of coke and ore are distributed at the appointed radial position according to the requirement, and the expression format is as follows:
description of the drawings: alpha is alphaCoke 1To alphaCoke 8For different gear-position tilting angles, alpha, of cokeCoke 1>αCoke 2>...αCoke 8Namely, the matrix gears 1 to 8 are arranged from the outer ring to the inner ring;
Clarge 1To CLarge 8The distribution number of turns of the 1-class coke is more than or equal to 0 and the number of turns is shown from the 1-gear position to the 8-gear position of the coke;
Csmall 1To CSmall 8The distribution number of turns of 2 types of coke is more than or equal to 0 and the number of turns is shown from the 1-8 gear position of the coke;
Olarge 1To OLarge 7The distribution turns of 1 type ore are more than or equal to 0 and the turns are represented from the position of 1 gear to 8 gears of coke;
Osmall 1To OSmall 7The distribution turns of 2 types of ores are shown from the position of 1 gear to the position of 8 gears of coke, and the set range is more than or equal to 0;
calculating the total number of turns N of the cokeCoke (coke)＝CLarge 1+CSmall 1+CLarge 2+CSmall 2.。。。+CLarge 8+CSmall 8Looping;
calculating the total number of turns N of the cokeMine＝OLarge 1+OSmall 1+OLarge 2+OSmall 2.。。。+OLarge 8+OSmall 8Looping;
calculating the characteristic value C of coke flowA1、CB1、CA2、CB2、CA3；
CA1The sum of the number of turns of the coke of the 1 class and the number of turns of the coke of the 2 classes are represented from the coke level 1 to the coke of the 2 classes, and the range is more than or equal to 0;
CB1is represented by CA1Counting the sum of the number of turns of the 2 types of cokes after the gear where the counting is finished begins to disappear until the 2 types of cokes disappear, wherein the number of turns is more than or equal to 0;
CA2is represented by CB1Counting the sum of the number of turns of the coke of the 1 class after the gear where the statistics is finished begins to appear to the first time of the coke of the 2 class, and if the coke of the 2 class does not appear to the second time, CA20, circle, range is more than or equal to 0;
CB2is represented by CA2Counting the sum of the number of turns of the coke of the 1 class after the gear where the statistics is finished begins to disappear to the second class of coke of the 2 class, and if the coke of the 2 class does not appear for the second time, judging that the coke of the C class does not appear for the second timeB20 circle, the range is more than or equal to 0;
calculating the ore flow characteristic value OA1、OB1、OA2、OB2、OA3；
OA1The sum of the turns of the 1 type ores and the turns of the 1 type ores is more than or equal to 0 from the 1 grade of ores to before the 2 type ores appear;
OB1represents OA1Counting the sum of the number of turns of the 2 types of ores after the gear where the counting is finished begins to disappear until the 2 types of ores disappear, wherein the range is more than or equal to 0;
OA2the sum of the turns of the 1-type ores from the beginning of the gear at which OB1 statistics are finished to the 2 nd occurrence of the 2 nd type ores, and O is determined if the 2 nd type ores do not appear for the 2 nd timeA20, circle, range is more than or equal to 0;
OB2represents OA2Counting the sum of the number of turns of the 1-type ores after the gear where the statistics is finished begins to disappear until the 2-type ores disappear, and if the 2 nd ores do not appear, then OB20, circle, range is more than or equal to 0;
for the following matrix
The coke material flow characteristic value is as follows: cA1＝3、CB1＝7、CA2＝0、CB2＝0；
The ore flow characteristic value is as follows: o isA1＝4、OB1＝6、OA2＝0、OB2＝0；
For the following matrix
The coke material flow characteristic value is as follows: cA1＝1、CB1＝3、CA2＝2、CB2＝4；
The ore flow characteristic value is as follows: o isA1＝4、OB1＝4、OA2＝0、OB2＝0；
4) Respectively calculating the total preparation time of coke and ore:
Tcoke (coke)＝MCoke (coke)/nCoke (coke)VCoke (coke)
TMine＝MMine/nMineVMine
In the formula: mCoke (coke)The weight of coke is one ton;
ncoke (coke)The number of the prepared materials of the type 1 coke tank is one;
Vcoke (coke)The material preparation speed for a single coke groove is t/s;
MmineWeighing per ton of ore;
nmine: the number of ore tank stocks is one; vMine: the material preparation speed of a single ore tank is t/s;
5) calculating the delay time:
calculating the discharge delay time of the coke tanks of the 1 class and the 2 class to be delta TCoke (coke)，s；
ΔTCoke (coke)＝ΔLCoke (coke)/VSkin coke
ΔLCoke (coke)Is the distance between the 2-type coke troughs, m; Δ L when coke class 1 is ahead of coke class 2 in the belt travel directionCoke (coke)
Positive, otherwise negative;
Vskin cokeThe running speed of the coke belt is m/s;
calculating the discharging delay time of the 1-class ore tank and the 2-class ore tank to be delta TCoke (coke)，s；
ΔTMine＝ΔLMine/VSkin mine
ΔLMineIs the maximum distance, m, between the class 2 coke troughs; with type 1 ore ahead of type 2 ore in the direction of belt travel
ΔLMinePositive, otherwise negative;
Vskin mineThe running speed of the ore belt is m/s;
6) the coke pre-loading process is as follows:
firstly, starting to prepare material and sending out a signal, and recording the time as T0；
From time T0At the beginning, the class 1 coke vibrating screen is opened, and the vibrating time is (M)Coke (coke)×CA1)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) Stopping vibration after second and recording the time as T1；
A formulaThe method comprises the following steps: mCoke (coke)The weight of coke is one ton;
ncoke 1Preparing materials for the current class 1 coke tank, wherein the number of the materials is one;
Vcoke (coke)The material preparation speed for a single coke groove is t/s;
③T1-ΔTcoke (coke)Starting a 2-class coke vibrating screen at the moment, starting material preparation, and vibrating for (M)Coke (coke)×CB1)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) Stopping vibration after second and recording the time as T2(ii) a If C is presentA1When equal to 0, the step Δ TCoke (coke)＝0；
④T2+ΔTCoke (coke)Starting a class 1 coke vibrating screen at the moment, starting material preparation, and vibrating for (M)Coke (coke)×CA2)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) Stopping vibration after second and recording the time as T3(ii) a If C is presentA2When equal to 0, the step Δ TCoke (coke)＝0；
⑤T3-ΔTCoke (coke)Starting a class 2 coke vibrating screen at the moment, starting material preparation, and vibrating for (M)Coke (coke)×CB2)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) Stopping vibration after second and recording the time as T4(ii) a If C is presentB2When equal to 0, the step Δ TCoke (coke)＝0；
⑥T3+ΔTCoke (coke)Starting a class 1 coke vibrating screen at any moment, starting material preparation, and detecting a weight value M by a middle hopperMeasuring＝MCoke (coke)Stopping the class-1 coke vibrating screen when the temperature is-beta, and finishing material preparation;
in the formula: mMeasuringThe coke middle is weighed as a measured value, ton; beta is the advance value set in the middle, the size and V thereofSkin cokeIn relation to the magnitude of the coke flow, when the tundish measures the weight value MMeasuring＝MCoke (coke)Beta, stopping the material preparation in advance, and after the material preparation is finished, the measured value of the middle bucket is just MCoke (coke)Ton;
7) the ore pre-loading process comprises the following steps:
firstly, preparing materials by using small weighing hoppers of ore tanks of types 1 and 2 which participate in material preparation:
total weight of single 2-type small ore bucket material preparationM2 smallComprises the following steps:
in the formula: mMineWeighing per ton of ore;
total weight M of single type 1 small ore bucket material preparation1 is smallComprises the following steps:
nmine 2Preparing the number of 2 types of ore tanks participating in the material preparation;
nmine 1Preparing the material for the type 1 ore tanks participating in the material preparation;
wherein the proportion of the pellets and the sinter is respectively carried out in the small weighing hoppers according to the proportion of the sinter and the pellets in the material list setting;
secondly, opening a small weighing hopper gate, discharging materials on a belt, opening a small weighing hopper gate of the 1-type ore tank, and when the weight reduction value of a single small weighing hopper is equal to (M)Mine×OA1)/(nMine 1×NMine) When the valve is closed, the gate is closed; recording the time T1;
③T1-ΔTmineStarting from the moment, the small weighing hoppers of the 2 types of ore tanks start to prepare materials, and when the weight reduction value of a single small weighing hopper is equal to (M)Mine×OB1)/(nMine 2×NMine) When the valve is closed, the gate is closed; recording time T2(ii) a If O is presentA1When equal to 0, the step Δ TMineThe value is 0;
④T2+ΔTmineStarting from the moment, the small weighing hoppers of the 1-type ore tanks start to prepare materials, and when the weight reduction value of a single small weighing hopper is equal to (M)Mine×OA2)/(nMine 1×NMine) When the valve is closed, the gate is closed; recording time T3(ii) a If O is presentB1When equal to 0, the step Δ TMineThe value is 0;
⑤T3-ΔTmineStarting to prepare materials for the small weighing hoppers of the 2 types of ore tanks till the materials are completely discharged, wherein the weighing value of each small weighing hopper of the 2 types returns to 0; recording the time T4; if it is notOB1When equal to 0, the step Δ TMineThe value is 0;
⑥T4-ΔTmineAnd (4) starting to prepare materials by the small weighing hoppers of the 1-type ore tanks until the materials are completely discharged, wherein the weighing value of each small weighing hopper of the 1-type ore tanks returns to 0, and finishing the material preparation.
The traditional distribution matrix can be converted into a method which can divide coke and ore into two categories and distribute different types of coke and ore in a designated ring position by automatically controlling the material preparation process.
New representation of the charge matrix: the existing charge matrix representation methods for the domestic steel-enterprise blast furnace cannot represent the radial positions of the raw fuels with different grades. Using pre-loading techniques, a new matrix representation is required after different levels of raw fuel are distributed at different radial positions. In a matrix
For example, a large particle size coke cloth is distributed to 41.5 degrees 2 circles, 39.9 degrees 1 circle, 10 degrees 4 circles, and a large particle size sintered cloth is distributed to 41.5 degrees and 39.9 degrees 2 circles respectively, 33.5 degrees 1 circle, which can be expressed as
The positions of the two types of cokes and the two types of sinters after pre-assembly can be represented by a novel matrix representation method. The blast furnace operator can study the relationship between the pre-load location and the gas flow by comparing the different matrices and the gas flow.
Compared with the prior art, the invention has the beneficial effects that:
1) the invention provides an original blast furnace burden preassembling technical idea, and coke and sintering furnace burden are classified according to various indexes such as quality, particle size and the like. Through automatic control, material flows with set sequence and length are formed on the belt. Thereby flexibly distributing the radial position of the blast furnace to any set position. The aim of distributing furnace materials with different characteristics and performances to the most reasonable area and further improving the smooth operation of the blast furnace and the utilization of coal gas is achieved.
2) The invention creates a pre-adjustment mode and provides a new way for maintaining the blast furnace yield and continuously excavating the potential of the charging matrix after the coke performance is reduced after the main coke coal is notched in the future.
3) The invention adds the preassembly result into the expression of the distribution matrix, so that the research between the preassembly mode and the coal gas utilization is possible.
The invention combines the material preparation process of the blast furnace with the material distribution matrix of the blast furnace, provides a new representation mode of the material distribution matrix of the blast furnace, and can set the positions and the turns of two types of coke and two types of ore on the matrix at will. The material flow characteristic value in the new material distribution matrix is extracted, and the characteristic value is used for calculating and controlling the starting time and the starting time of the coke screen, the starting time and the starting time of the ore weighing hopper feeder, so that the furnace burden is pre-loaded in the lower tank of the blast furnace according to the set number of turns and the set position information of the new material distribution matrix. Finally, distributing furnace burden in the blast furnace according to the setting through preassembling, and realizing the functions of weight control of various raw fuels in a new loading matrix of the blast furnace to be accurate to the number of turns and position control of various raw fuels to be accurate to the tilting angle.
Detailed Description
The invention discloses a control method for pre-loading distribution of blast furnace burden. Those skilled in the art can modify the process parameters appropriately to achieve the desired results with reference to the disclosure herein. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.
[ examples ] A method for producing a compound
Taking a certain blast furnace as an example:
the original coke batch weight is 15t, the ore batch weight is 80 t, wherein the sintering accounts for 70 percent and is 56 t, the pellets are 24 t, the coke ore grooves are distributed into 2 coke grooves of type 1 and 4 coke grooves of type 2, and the sintering is carried out on 4 seats of the sintering grooves of type 1 and 2 seats of the sintering grooves of type 2. The material preparation is realized by simultaneously preparing two coke and ore tanks, and the maximum capacity of the blast furnace return ore and the return coke belt is only the condition that 4 coke and ore tanks are simultaneously preparedIn this case, the conventional cloth matrix is
A class 1 coke cloth is scheduled to 2 laps each of 41.5 ° and 38.2 °, 10 ° 4 laps, and a class 1 sintered cloth is scheduled to 2 laps each of 41.5 ° 39.9 ° 35.9 ° 33.5 °, forming a new matrix of:
the coke material flow characteristic value is as follows: cA1＝1、CB1＝3、CA2＝2、CB2＝4
The ore flow characteristic value is as follows: o isA1＝4、OB1＝4、OA2＝0、OB2＝0
The preassembly process comprises the following steps:
starting a coke screen of the 1-class coke tank to vibrate, preparing 2 1-class coke tanks simultaneously, and vibrating for (M)Coke (coke)×CA1)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) The vibration was stopped after 21 seconds (15 × 1)/(2 × 0.025 × 14);
② advance by DeltaL/VLeatherAfter 15s when 30/2 is equal, the opening vibration time of the 2-class coke oven is (M)Coke (coke)×CB1)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) Stop after 64 seconds (15 × 3)/(2 × 0.025 × 14)
③ time delay delta L/VLeatherAfter 15s when 30/2 is equal, the opening vibration time of the coke oven class 1 is (M)Coke (coke)×CA2)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) Stopping the vibration after 42 seconds of (15 × 2)/(2 × 0.025 × 14);
advancing Delta L/VLeatherAfter 15s when 30/2 is equal, the opening vibration time of the 2-class coke oven is (M)Coke (coke)×CB2)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) Stop after 64 seconds (15 × 4)/(2 × 0.025 × 14)
Time delay delta L/VLeatherAfter 30/2 is 15s, opening the coke tank of class 1, and when the coke intermediate bucket weighing value M coke-beta is 15-3 is 12 tons (64 s is estimated), closing the coke tank of class 1, and finishing coke preparation;
the whole preparation time of the batch of coke preparation is as follows: compared with the original 2-coke-trough material distribution time of 15/0.025/2, 255 seconds are saved, and 45 seconds are saved.
Ore:
firstly, 2 small weighing hoppers of 1 type ores are prepared according to the weight of 80/(2+3+ 2+2) × (2+2+2+2) × (53.3 tons, wherein the sintering weight is 37.3 tons, and the pellets weight is 16 tons. Preparing materials for 2 types of ores by a small weighing hopper according to the weight ratio of 80/(2+3+3+2+2) × (1+3) ═ 26.7 tons, wherein sintering is 18.7 tons, and pellets are 8 tons;
and 2 small weighing hopper gates for 1 type ores are opened, and the gates are closed when the reduction amount is 80/(2+3+3+2+2) × (2+2) ═ 26.7 tons.
③ time delay delta L/VLeatherAfter 30/2 is 15s, the gate of the small weighing hopper of the 2-type ore is opened until the weighing value of the small weighing hopper is 0;
and fourthly, opening the gate of the small weighing hopper for the 1-type ore for the second time until the weighing value of the small weighing hopper is 0.
According to the invention, through the correlated control of the time node control of the material belt material flow of the prepared material and the time node of the declination of the charging tilting angle of the blast furnace, coke and sintering with specific characteristics and quality can be accurately distributed at any radial position of the blast furnace. The invention provides a novel representation method of a blast furnace matrix, and the distribution positions of furnace charges with different grades and qualities can be clearly indicated in the novel representation method of the matrix.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (2)
1. The blast furnace charge preassembly distribution control method is characterized in that blast furnace raw fuels with different characteristics and grades are loaded into a lower tank of a blast furnace according to different sequences, the preassembly of the blast furnace charge is realized by controlling the relative positions of the raw materials of all grades in the lower tank, and further the random combination of the distribution positions of the raw fuels with different characteristics in the radial direction of the blast furnace is realized, and the method specifically comprises the following steps:
1) dividing coke tanks into two types, wherein the type 1 is large-particle-size coke, using a coke sieve with a pore diameter of 40mm, the number of the large-particle-size coke tanks is more than or equal to 2, and the number of the coke tanks prepared is less than or equal to 2 at the same time during material preparation; 2, coke with common particle size is used, and a coke sieve with the aperture of 25mm is used;
2) the ore tanks are divided into two types, wherein the type 1 is a large-particle ore tank, and ores with the particle size of 10-30 mm are stored; 2, a small-particle ore tank is used for storing ores with the particle size of 5-10 mm;
3) for any one 4-8-grade distribution matrix of the current blast furnace, two types of coke and ore are distributed at the appointed radial position according to the requirement, and the expression format is as follows:
inclination angle of coke: alpha is alphaCoke 1、αCoke 2、αCoke 3、αCoke 4、αCoke 5、αCoke 6、αCoke 7、αCoke 8；
Coke gear: 1. 2, 3, 4, 5, 6, 7, 8;
the number of turns is set: cLarge 1、CSmall 1，CLarge 2、CSmall 2，CLarge 3、CSmall 3，CLarge 4、CSmall 4，CLarge 5、CSmall 5CLarge 6、CSmall 6，CLarge 7CSmall 7，CLarge 8；
The ore dip angle: alpha ore 1, alpha ore 2, alpha ore 3, alpha ore 4, alpha ore 5, alpha ore 6 and alpha ore 7;
ore gear: 1. 2, 3, 4, 5, 6, 7;
the number of turns is set: o isLarge 1、OSmall 1，OLarge 2、OSmall 2，OLarge 3、OSmall 3，OLarge 4、OSmall 4，OLarge 5、OSmall 5，OLarge 6、OSmall 6，OLarge 7、OSmall 7；
αCoke 1To alphaCoke 8For different gear-position tilting angles, alpha, of cokeCoke 1>αCoke 2>...αCoke 8Namely, the matrix gears 1 to 8 are arranged from the outer ring to the inner ring;
Clarge 1To CLarge 8Coke class 1 coke representing the coke 1 to 8 positionsNumber of turns of cloth, CLarge 1To CLarge 8Setting the range to be more than or equal to 0 and circling;
Csmall 1To CSmall 8Indicating the position of coke 1 to 8, the number of distribution turns of 2 types of coke, CSmall 1To CSmall 8Setting the range to be more than or equal to 0 and circling;
Olarge 1To OLarge 7Indicating the coke 1 to 8 shift positions, the number of distribution turns of 1 type ore, OLarge 1To OLarge 7Setting the range to be more than or equal to 0 and circling;
Osmall 1To OSmall 7Indicating the coke 1 to 8 shift positions, the number of distribution turns of 2 types of ores, OSmall 1To OSmall 7Setting the range to be more than or equal to 0 and circling;
calculating the total number of turns N of the cokeCoke (coke)＝CLarge 1+CSmall 1+CLarge 2+CSmall 2.。。。+CLarge 8+CSmall 8Looping;
calculating the total number of turns N of the cokeMine＝OLarge 1+OSmall 1+OLarge 2+OSmall 2.。。。+OLarge 8+OSmall 8Looping;
calculating the characteristic value C of coke flowA1、CB1、CA2、CB2、CA3；
CA1The sum of the number of turns of the coke of the 1 class and the number of turns of the coke of the 2 classes are represented from the coke level 1 to the coke of the 2 classes, and the range is more than or equal to 0;
CB1is represented by CA1Counting the sum of the number of turns of the 2 types of cokes after the gear where the counting is finished begins to disappear until the 2 types of cokes disappear, wherein the number of turns is more than or equal to 0;
CA2is represented by CB1Counting the sum of the number of turns of the coke of the 1 class after the gear where the statistics is finished begins to appear to the 2 class coke for the first time, and if the 2 class coke does not appear for the second time, judging that the number of turns of the coke of the C class is larger than the sum of the number of turns of the coke of the 2 class coke for the second timeA20, circle, range is more than or equal to 0;
CB2is represented by CA2Counting the sum of the number of turns of the coke of the 1 class after the gear where the statistics is finished begins to disappear to the second class of coke of the 2 class, and if the coke of the 2 class does not appear for the second time, judging that the coke of the C class does not appear for the second timeB20 circle, the range is more than or equal to 0;
calculating the ore flow characteristic value OA1、OB1、OA2、OB2、OA3；
OA1The sum of the turns of the 1 type ores and the turns of the 1 type ores is more than or equal to 0 from the 1 grade of ores to before the 2 type ores appear;
OB1represents OA1Counting the sum of the number of turns of the 2 types of ores after the gear where the counting is finished begins to disappear until the 2 types of ores disappear, wherein the range is more than or equal to 0;
OA2the sum of the turns of the 1-type ores from the beginning of the gear at which OB1 statistics are finished to the 2 nd occurrence of the 2 nd type ores, and O is determined if the 2 nd type ores do not appear for the 2 nd timeA20, circle, range is more than or equal to 0;
OB2represents OA2Counting the sum of the number of turns of the 1-type ores after the gear where the statistics is finished begins to disappear until the 2-type ores disappear, and if the 2 nd ores do not appear, then OB20, circle, range is more than or equal to 0;
4) respectively calculating the total preparation time of coke and ore:
Tcoke (coke)＝MCoke (coke)/nCoke (coke)VCoke (coke)
TMine＝MMine/nMineVMine
In the formula: mCoke (coke)The weight of coke is one ton;
ncoke (coke)The number of the prepared materials of the type 1 coke tank is one;
Vcoke (coke)The material preparation speed for a single coke groove is t/s;
MmineWeighing per ton of ore;
nmine: the number of ore tank stocks is one; vMine: the material preparation speed of a single ore tank is t/s;
5) calculating the delay time:
calculating the discharge delay time of the coke tanks of the 1 class and the 2 class to be delta TCoke (coke)，s；
ΔTCoke (coke)＝ΔLCoke (coke)/VSkin coke
ΔLCoke (coke)Is the distance between the 2-type coke troughs, m; Δ L when coke class 1 is ahead of coke class 2 in the belt travel directionCoke (coke)Positive, otherwise negative;
Vskin cokeIn order to determine the running speed of the coke belt,m/s；
calculating the discharging delay time of the 1-class ore tank and the 2-class ore tank to be delta TCoke (coke)，s；
ΔTMine＝ΔLMine/VSkin mine
ΔLMineIs the maximum distance, m, between the class 2 coke troughs; Δ L when class 1 ore is ahead of class 2 ore in the direction of belt travelMinePositive, otherwise negative;
Vskin mineThe running speed of the ore belt is m/s;
6) the coke pre-loading process is as follows:
firstly, starting to prepare material and sending out a signal, and recording the time as T0；
From time T0At the beginning, the class 1 coke vibrating screen is opened, and the vibrating time is (M)Coke (coke)×CA1)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) Stopping vibration after second and recording the time as T1；
In the formula: mCoke (coke)The weight of coke is one ton;
ncoke 1Preparing materials for the current class 1 coke tank, wherein the number of the materials is one;
Vcoke (coke)The material preparation speed for a single coke groove is t/s;
③T1-ΔTcoke (coke)Starting a 2-class coke vibrating screen at the moment, starting material preparation, and vibrating for (M)Coke (coke)×CB1)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) Stopping vibration after second and recording the time as T2(ii) a If CA1When equal to 0, the step Δ TCoke (coke)＝0；
④T2+ΔTCoke (coke)Starting a class 1 coke vibrating screen at the moment, starting material preparation, and vibrating for (M)Coke (coke)×CA2)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) Stopping vibration after second and recording the time as T3(ii) a If CA2When equal to 0, the step Δ TCoke (coke)＝0；
⑤T3-ΔTCoke (coke)Starting a class 2 coke vibrating screen at the moment, starting material preparation, and vibrating for (M)Coke (coke)×CB2)/(nCoke (coke)×VCoke (coke)×NCoke (coke)) Stopping vibration after second and recording the time as T4(ii) a If CB2When equal to 0, the step Δ TCoke (coke)＝0；
⑥T3+ΔTCoke (coke)Starting a class 1 coke vibrating screen at any moment, starting material preparation, and detecting a weight value M by a middle hopperMeasuring＝MCoke (coke)Stopping the class-1 coke vibrating screen when the temperature is-beta, and finishing material preparation;
in the formula: mMeasuringThe coke middle is weighed as a measured value, ton; beta is the advance value set in the middle, the size and V thereofSkin cokeIn relation to the magnitude of the coke flow, when the tundish measures the weight value MMeasuring＝MCoke (coke)Beta, stopping the material preparation in advance, and after the material preparation is finished, the measured value of the middle bucket is just MCoke (coke)Ton;
7) the ore pre-loading process comprises the following steps:
firstly, preparing materials by using small weighing hoppers of ore tanks of types 1 and 2 which participate in material preparation:
total weight M of single 2-type small ore bucket material preparation2 smallComprises the following steps:
in the formula: mMineWeighing per ton of ore;
total weight M of single type 1 small ore bucket material preparation1 is smallComprises the following steps:
nmine 2Preparing the number of 2 types of ore tanks participating in the material preparation;
nmine 1Preparing the material for the type 1 ore tanks participating in the material preparation;
wherein the proportion of the pellets and the sinter is respectively carried out in the small weighing hoppers according to the proportion of the sinter and the pellets in the material list setting;
secondly, opening a small weighing hopper gate, discharging materials on a belt, opening a small weighing hopper gate of the 1-type ore tank, and when the weight reduction value of a single small weighing hopper is equal to (M)Mine×OA1)/(nMine 1×NMine) When the valve is closed, the gate is closed; recording time T1；
③T1-ΔTMineStarting from the moment, the small weighing hoppers of the 2 types of ore tanks start to prepare materials, and when the weight reduction value of a single small weighing hopper is equal to (M)Mine×OB1)/(nMine 2×NMine) When the valve is closed, the gate is closed; recording time T2(ii) a If O isA1When equal to 0, the step Δ TMineThe value is 0;
④T2+ΔTmineStarting from the moment, the small weighing hoppers of the 1-type ore tanks start to prepare materials, and when the weight reduction value of a single small weighing hopper is equal to (M)Mine×OA2)/(nMine 1×NMine) When the valve is closed, the gate is closed; recording time T3(ii) a If O isB1When equal to 0, the step Δ TMineThe value is 0;
⑤T3-ΔTmineStarting to prepare materials for the small weighing hoppers of the 2 types of ore tanks till the materials are completely discharged, wherein the weighing value of each small weighing hopper of the 2 types returns to 0; recording the time T4; if O isB1When equal to 0, the step Δ TMineThe value is 0;
⑥T4-ΔTmineAnd (4) starting to prepare materials by the small weighing hoppers of the 1-type ore tanks until the materials are completely discharged, wherein the weighing value of each small weighing hopper of the 1-type ore tanks returns to 0, and finishing the material preparation.
2. The method for controlling the pre-loading distribution of the blast furnace burden as claimed in claim 1, wherein in step 1), coke troughs are divided into two types according to the cold and hot state indexes of coke or dry and wet coke, coke with good performance is divided into 1 type, coke with poor performance is divided into 2 types, and the coke sieve pore sizes are the same.
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