CN117512237A - Containing CO 2 Ironmaking method and system by coupling coal gas and biomass injection - Google Patents
Containing CO 2 Ironmaking method and system by coupling coal gas and biomass injection Download PDFInfo
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- 239000002028 Biomass Substances 0.000 title claims abstract description 133
- 238000000034 method Methods 0.000 title claims abstract description 53
- 239000003034 coal gas Substances 0.000 title claims abstract description 50
- 238000002347 injection Methods 0.000 title claims abstract description 44
- 239000007924 injection Substances 0.000 title claims abstract description 44
- 230000008878 coupling Effects 0.000 title claims abstract description 20
- 238000010168 coupling process Methods 0.000 title claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 73
- 239000000571 coke Substances 0.000 claims abstract description 68
- 239000003245 coal Substances 0.000 claims abstract description 58
- 238000003723 Smelting Methods 0.000 claims abstract description 45
- 238000004364 calculation method Methods 0.000 claims abstract description 30
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 24
- 239000000654 additive Substances 0.000 claims abstract description 7
- 230000000996 additive effect Effects 0.000 claims abstract description 7
- 238000013500 data storage Methods 0.000 claims abstract description 7
- 238000010310 metallurgical process Methods 0.000 claims abstract description 5
- 239000007921 spray Substances 0.000 claims abstract description 5
- 239000007789 gas Substances 0.000 claims description 103
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 76
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 76
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 37
- 238000002485 combustion reaction Methods 0.000 claims description 25
- 230000009467 reduction Effects 0.000 claims description 25
- 230000008569 process Effects 0.000 claims description 23
- 229910052742 iron Inorganic materials 0.000 claims description 17
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 229910000805 Pig iron Inorganic materials 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 6
- 239000002817 coal dust Substances 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 239000002440 industrial waste Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000446 fuel Substances 0.000 abstract description 14
- 239000003054 catalyst Substances 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000012046 mixed solvent Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- C21B5/001—Injecting additional fuel or reducing agents
-
- 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
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
- G16C60/00—Computational materials science, i.e. ICT specially adapted for investigating the physical or chemical properties of materials or phenomena associated with their design, synthesis, processing, characterisation or utilisation
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Computing Systems (AREA)
- Theoretical Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Manufacture Of Iron (AREA)
Abstract
The invention relates to a catalyst containing CO 2 An iron-making method and system by coupling coal gas and biomass injection, which belong to the technical field of blast furnace smelting. The system comprises a material basic data storage and processing module; a material balance and heat balance measuring and calculating module; a biomass additive amount calculation module; a material basic parameter input module; a metallurgical process parameter input module; a smelting parameter constraint interval input module; and a low-carbon smelting parameter output module. The measuring and calculating method disclosed by the invention is based on material balance and heat balance, and CO is blown into a blast furnace 2 On the premise of coal gas, the required biomass injection quantity, the corresponding coke ratio and the coal ratio are obtained through calculation of the heat difference value, so that the low-carbon smelting of the blast furnace is realized. The system and the method can guide the blast furnace to spray CO 2 Determining the biomass addition amount by using coal gas; can be used for preparing fuel, furnace burden and CO 2 The types and components of the coal gas and the biomass can be high at any timeThe technological parameters of low-carbon smelting in the furnace can achieve the purpose of reducing the fuel ratio compared with the original smelting conditions.
Description
Technical Field
The invention belongs to the technical field of blast furnace smelting, and relates to a furnace smelting furnace containing CO 2 An ironmaking method and system by coupling coal gas and biomass injection.
Background
Along with CO 2 Emissions are a worldwide focus of attention, and iron and steel plants as large carbon emission households are in need of a series of new low-carbon smelting technologies to realize low-carbon production and reduce CO 2 And (5) discharging. The energy consumption and carbon emission of the system in front of iron account for more than 70% of the whole process of iron and steel production, and the energy conservation and emission reduction of blast furnace ironmaking are important ways for reducing the energy consumption and pollutant emission of iron and steel plants. Typically, about 4.2X10 are produced per 1t of raw steel produced 6 kJ blast furnace gas, 4.1X10 g 6 kJ coke oven gas, 1.0X10 4 kJ converter gas and other waste gases in the plant, and the byproduct gas amount in the plant is large, but the recycling rate is low. Has high CO similar to blast furnace gas, hot blast stove waste gas and the like 2 The treatment and utilization efficiency of the content gas is lower, and CO is removed firstly 2 The secondary utilization mode is complicated in process, and CO in the product gas 2 The lower the content, the higher the treatment cost, the smaller the product gas quantity, and therefore, how to realize the CO content 2 The high-efficiency application of the coal gas has important significance for reducing carbon emission and production cost.
CO under high temperature condition 2 Will react with C to form CO, thus, will contain CO 2 The gas is injected into the blast furnace, on one hand, the reducing gas can be provided for the inside of the blast furnace, and on the other hand, the CO can be contained 2 The high-efficiency utilization of the coal gas reduces the carbon emission. But due to CO 2 The reaction with C is an endothermic reaction, CO 2 The addition of the catalyst can lead the heat quantity of a high-temperature area of the blast furnace to be insufficient, so that measures are needed to be taken for carrying out thermal compensation on the blast furnace to meet the production requirement of the blast furnace, and main measures include adjustment of process parameters, such as improving the oxygen enrichment rate, increasing the coal injection quantity and the like; and adding thermal compensation substances, such as biomass, waste plastics and the like. The adjustment of the technological parameters can improve the fuel ratio of the blast furnace, the biomass in the thermal compensation material is green and environment-friendly energy, the content of S, N is small, the ash content is low relative to fossil energy, and the emission of pollutants is small, so that the biomass is sprayed into the blast furnace, and the injection of CO can be realized 2 The blast furnace of the gas provides thermal compensation and simultaneously reduces the fuel ratio of the blast furnace, thereby further realizing low-carbon smelting in the steel plant.
Disclosure of Invention
The object of the present invention is to provide a catalyst composition comprising CO 2 Iron-making method and system by coupling coal gas and biomass injection, and method and system for producing carbon monoxide (CO) -containing material 2 The comprehensive judgment of the gas injection amount and the thermal compensation material addition amount is carried out to solve the problem that the blast furnace injects CO 2 And the problem of low-carbon smelting is solved under the condition of coal gas.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a blast furnace injection biomass additive amount measuring method comprises the following steps:
s1, calculating material balance and heat balance according to target raw materials and process parameters to obtain a raw coke ratio and a coal ratio which meet the forward running of a blast furnace;
s2 according to the content of CO 2 Calculating heat balance by using the coal gas addition amount, and calculating initial biomass addition amount a according to biomass unit heat supply amount 0 ；
S3, measuring and calculating material balance and heat balance according to the biomass addition amount, and if the material balance and the heat balance are not met, determining a gradient k 1 Reducing the biomass addition amount to meet the material levelBalance and heat balance;
s4, after S3 is met, judging whether the theoretical combustion temperature and the gas utilization rate are in a constraint interval, and if not, determining the gradient k 2 And (3) reducing the raw coke ratio and the coal ratio, calculating the absolute difference of heat balance and the corresponding biomass addition amount, returning to the step (S3), repeating the step (S3) and the step (S4) until the requirements of the two steps are met at the same time, and outputting smelting parameters.
Optionally, the judgment in step S2 is based on the relative difference of balance (income-expense)/income of 100%. Accounting for < 0.50%.
Optionally, the means for reducing the raw coke ratio and the coal ratio in step S4 includes: the full coke reduction ratio, the full coal reduction ratio and the coke ratio and the coal ratio are simultaneously reduced according to the same proportion.
CO-containing material 2 An ironmaking method by coupling coal gas and biomass injection,
collecting CO-containing 2 Gas, biomass composition, type, and reserves data;
calculating the biomass addition amount and outputting smelting parameters by the method;
guiding a blast furnace to carry out biomass addition and CO-containing injection according to smelting parameters 2 And (3) gas.
Optionally, the blast furnace is blown with CO 2 Coal gas, including decarbonized and denitrified blast furnace gas, coke oven gas and CO-containing gas 2 Industrial waste gas.
Optionally, at different CO content 2 Under the conditions of the types and the components of the coal gas and the biomass, the CO content is calculated 2 Biomass addition amount, coke ratio and coal ratio corresponding to different injection amounts of coal gas.
CO-containing material 2 The iron-making system with coal gas and biomass injection coupling comprises a background analysis system and a front-end use system;
the background analysis system includes: the material basic data storage and processing module; a material balance and heat balance measuring and calculating module; a biomass additive amount calculation module;
the front end use system includes: a material basic parameter input module; a metallurgical process parameter input module; a smelting parameter constraint interval input module; a low-carbon smelting parameter output module;
the calculation logic of the biomass addition calculation module is the method according to any one of claims 1-3.
Optionally, the material basic data storage and processing module: CO-containing to be collected 2 The components, reserves and performance index data of coal gas, biomass and other blast furnace materials are stored and the missing value and abnormal value are processed.
Optionally, the material balance and thermal balance measuring and calculating module: according to the given raw materials and technological parameter conditions, calculating the gas components and gas quantity of the furnace top, the pig iron components, the gas quantity and components of a tuyere convolution zone, the heat release quantity and the reduction heat absorption quantity of the furnace combustion, judging whether the materials are balanced and the heat is balanced, and judging whether the parameter indexes of the gas utilization rate and the theoretical combustion temperature meet constraint conditions.
Optionally, the material basic parameter input module: the parameters entered include: coke, coal dust, iron-containing furnace burden, biomass and CO 2 Composition, reserves, heating value and base characteristic data of the gas.
Optionally, the smelting process parameter input module: the parameters entered include: blast furnace burden structure, blast furnace smelting element distribution rate, slag alkalinity, blowing medium temperature and CO content 2 The parameter values of the gas injection quantity, the direct reduction degree and the oxygen enrichment rate.
Optionally, the smelting parameter constraint interval input module is used for inputting constraint ranges of theoretical combustion temperature and gas utilization rate.
Optionally, the low-carbon smelting parameter output module outputs the coke ratio, the coal ratio and the corresponding biomass addition amount meeting the low-carbon smelting requirement through calculation of the heat difference value, and guides the blast furnace to spray and blow the carbon monoxide containing material 2 And (3) gas.
The invention has the beneficial effects that:
the invention is based on material balance and heat balance, and sprays CO in blast furnace 2 On the premise of coal gas, the system and the method can guide the blast furnace to blow CO-containing gas through theory 2 Determining the addition amount of a thermal compensation substance (biomass) by using coal gas; can be according to the originalFuel, CO-containing 2 The types and components of the gas and the thermal compensation substances can be obtained at any time to meet the technological parameters of low-carbon smelting of the blast furnace, and compared with the original smelting conditions, the purpose of reducing the fuel ratio is achieved. And calculating to obtain the required injection quantity of the biomass and the values of other important process parameters, so as to realize low-carbon smelting of the blast furnace.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of a method for measuring biomass addition amount of blast furnace injection;
FIG. 2 shows a CO-containing system 2 A flow chart of an ironmaking method by coupling coal gas and biomass injection;
FIG. 3 shows a CO-containing system 2 Schematic diagram of an ironmaking system with coal gas and biomass injection coupling.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1 to 3, the invention firstly discloses a biomass additive measuring method, which comprises the following steps:
s1: calculating material balance and heat balance according to raw fuel components, furnace burden structure and production process parameters in a target plant to obtain the raw coke ratio and the coal ratio of the target furnace;
s2: according to the content of CO 2 The addition amount of the coal gas keeps the original coke ratio, the coal ratio and other technological parameters unchanged, and the absolute difference value Q of heat balance is calculated Difference of difference The initial biomass addition amount a is calculated according to the heat supply amount q of the unit biomass 0 ＝︱Q Difference of difference I/q, at which time the biomass addition amount is a=a 0 ；
S3: calculating whether materials are balanced or not and whether heat is balanced or not according to the calculated biomass addition quantity a, judging that the basis is the |balance relatively poor|| (income-expense)/income is 100% | < 0.50%, and when the material balance and the heat balance are not met, determining a certain gradient k 1 Reducing the biomass addition amount and then carrying out balance calculation, k 1 Adjustable (as small as possible) until meetingMaterial balance and heat balance, at this time, the biomass addition amount is a i ＝a 0 -ik 1 (i represents the number of times of reducing the biomass addition amount), and when the material balance and the heat balance are satisfied, performing the next judgment and calculation;
s4: judging the biomass addition amount a in S3 i Calculating whether the theoretical combustion temperature and the gas utilization rate obtained after material balance and heat balance are in a constraint interval, outputting relevant smelting parameters when the conditions are met, and reducing the raw coke ratio and the coal ratio according to the in-plant requirements and the gradient k when the constraint interval is not met 2 Is adjustable (as small as possible), other technological parameters are kept unchanged, and the absolute difference of heat balance and the corresponding biological mass b are calculated 1 The biomass addition amount at this time was a i+1 ＝a i +b 1 The method comprises the steps of carrying out a first treatment on the surface of the The reduction of the coke ratio and the coal ratio according to the in-plant requirements includes: full tar reduction, full coal reduction, and simultaneous reduction of the coke ratio and the coal ratio according to a certain proportion.
S5: according to the calculated biomass addition quantity a i+1 And repeating the steps S3 and S4 until the adjusted coke ratio, coal ratio and biomass addition amount are calculated to meet the requirements of material balance and heat balance, the theoretical combustion temperature and the gas utilization rate are in a constraint interval, and outputting corresponding smelting parameters.
The invention also provides a method for measuring and calculating the content of CO based on the method 2 Iron-making method by coupling coal gas and biomass injection, and collecting CO-containing gas 2 Gas (decarbonizing and denitrifying blast furnace gas, coke oven gas, and CO-containing gas) 2 Industrial waste gas) and biomass components, types, reserves and the like, and processing the data by missing values and abnormal values; calculating material balance and heat balance according to the target blast furnace raw fuel and technological parameters to obtain raw coke ratio and coal ratio which meet the forward running of the blast furnace; selecting available CO-containing 2 Basic data of coal gas and biomass are input into the system containing CO 2 The injection quantity of the coal gas and the related parameter constraint interval keep the rest process parameters of the target furnace unchanged, the target is to meet the constraint interval of the coal gas utilization rate and the theoretical combustion temperature, the coke ratio and the coal ratio are reduced according to the requirements, and the biomass addition quantity is calculated through the heat difference.
Blast furnace injection of CO-containing 2 Coal gas, including decarbonized and denitrified blast furnace gas, coke oven gas and CO-containing gas 2 Industrial waste gas, reducing CO removal 2 CO of the process flow of (a) 2 The concentration requirement, and the heat compensation by adding biomass, reduces the carbon emission of the iron and steel plant. Based on material balance and heat balance, a biomass additive amount calculation model is constructed according to a constraint interval of smelting parameters, and the biomass additive amount calculation model contains CO in different modes 2 Under the conditions of the types and the components of the coal gas and the biomass, the CO content is calculated 2 The biomass addition amount, the coke ratio and the coal ratio corresponding to different injection amounts of the coal gas realize dynamic regulation and control of injection amounts and partial process parameter values, and achieve the aim of low-carbon smelting.
The invention also provides a method for measuring and calculating the content of CO based on the method 2 The ironmaking system with coal gas and biomass injection coupling comprises a background analysis system and a front-end use system. The background analysis system includes: the material basic data storage and processing module; a material balance and heat balance measuring and calculating module; and a biomass addition amount calculation module. The front end use system includes: a material basic parameter input module; a metallurgical process parameter input module; a smelting parameter constraint interval input module; and a low-carbon smelting parameter output module.
The material basic data storage and processing module has the functions that: CO-containing to be collected 2 Gas (decarbonizing and denitrifying blast furnace gas, coke oven gas, and CO-containing gas) 2 Industrial waste gas), biomass and other blast furnace materials, wherein CO is used for storing index data such as components, reserves and performances of the materials, and treating missing values and abnormal values 2 The content range is 1-10%. The material balance and heat balance measuring and calculating module calculates the gas components and gas quantity of the furnace top, the pig iron components, the gas quantity and components of the tuyere convolution zone, the heat release amount in the furnace and the reduction heat absorption amount according to the given raw materials and technological parameter conditions, and judges whether the parameter indexes such as the material balance and heat balance, the gas utilization rate, the theoretical combustion temperature and the like meet the actual requirements; the parameters input by the material basic parameter input module comprise: inputting coke, coal dust, iron-containing furnace burden, biomass and CO 2 Composition, reserves, heating value and base characteristic data of the gas; the parameters input by the metallurgical process parameter input module comprise: inputting the furnace burden structure of the target furnace, the distribution rate of smelting elements of the blast furnace, the alkalinity of slag, the temperature of a blowing medium and the content of CO 2 The parameter values of the gas injection quantity, the direct reduction degree and the oxygen enrichment rate; the parameters input by the smelting parameter constraint interval input module comprise: inputting theoretical combustion temperature and gas utilization rate to meet the constraint range value of blast furnace smelting according to actual production and theoretical calculation experience; the low-carbon smelting parameter output module outputs the coke ratio, the coal ratio and the corresponding biomass addition amount meeting the low-carbon smelting requirement through calculation of the heat difference value, and guides the blast furnace to spray and blow the carbon monoxide-containing material 2 And (3) gas.
Example 1
Step 1, obtaining 3200m of a certain iron and steel plant 3 In the case of blast furnace materials, a certain iron and steel plant currently uses coke A, coal dust B, mixed ore and mixed solvent, and in addition, has decarbonized and denitrified blast furnace gas (containing 2% CO) 2 ) Biomass a.
Step 2, calculating the initial coke ratio and the coal ratio of the target blast furnace, and calculating the material balance and the heat balance by using the raw fuel and the process parameters of the target blast furnace, wherein the raw process parameters mainly comprise: distribution ratio of element into pig iron: η (eta) Fe ＝99.75％，η Mn =60.05%; the slag basicity R is 1.25; degree of direct iron reduction r d 0.5; the temperature of the top gas is 159 ℃, the oxygen enrichment rate is 0.01, etc. Without blowing CO 2 Under the condition of coal gas, the raw coke ratio C meeting the forward running of the blast furnace is obtained Coke 0 Sum coal ratio C Coal 0 355kg/t and 160kg/t, respectively.
Step 3, determining the content of CO 2 Quantity of injected gas V Air flow The biomass addition amount decreases the gradient value k 1 Reduced gradient value k of coke ratio and coal ratio 2 The range values of parameters such as gas utilization rate, theoretical combustion temperature and the like are obtained according to collected historical production data of the blast furnace of the steel plant and theoretical calculation: the gas utilization rate is less than or equal to 0.48 and less than or equal to 0.49; the theoretical combustion temperature is less than or equal to 2100 ℃ and less than or equal to 2250 ℃. According to the requirements and reserves in the factory, the CO is contained 2 The gas injection quantity is 40m 3 T, biomass addition reduction gradient value k 1 The gradient of the decrease in the coke ratio and the coal ratio was 0.05kg/t, and 1kg/t.
Step 4, the blast furnace contains CO 2 Calculation of the amount of gas injection corresponding to the amount of thermally compensated biomass injection required
S1: containing CO 2 The addition amount of the gas is 40m 3 And (3) keeping the raw coke ratio, the coal ratio and other technological parameters unchanged, calculating to obtain an absolute difference value of heat balance of-0.03 GJ/t, and calculating the initial biomass addition quantity a, wherein the heat supply quantity of unit biomass is 0.025GJ/kg 0 =0.03/0.025=1.20 kg/t, when biomass was added in an amount of a=a 0 ＝1.20kg/t；
S2: calculating material and heat balance according to the calculated biomass addition amount of 1.20kg/t, the coke ratio and the coal ratio of 355kg/t and 160kg/t respectively, judging that the material balance and the heat balance are met, and performing the next step of judgment and calculation;
s3: the theoretical combustion temperature and the gas utilization rate obtained by calculation according to the S2 are 2192 ℃ and 0.468 respectively, wherein the gas utilization rate does not meet the constraint interval, the gas utilization rate is reduced according to the ratio of the coke ratio to the coal ratio of 1:1, and the gradient k is reduced 2 1kg/t, 354kg/t and 159kg/t respectively after reduction, other process parameters remain unchanged, and the absolute difference of heat balance is calculated to be-0.005 GJ/t and the corresponding biological mass b 1 At 0.20kg/t, the biomass addition amount at this time was a 1 ＝a 0 +b 1 ＝1.20+0.20＝1.40kg/t；
S4: according to the calculated biomass addition quantity a 1 And repeating the steps S2-S3, wherein when the 8 th time is repeated, the coke ratio and the coal ratio are 347kg/t and 152kg/t respectively, the biomass addition amount is 5kg/t, the material balance and the heat balance are calculated and met, and the theoretical combustion temperature and the coal gas utilization rate are 2186 ℃ and 0.481 respectively and are in a constraint interval.
And 5, outputting a coke ratio of 347kg/t, a coal ratio of 152kg/t, a biomass addition amount of 5kg/t, and a fuel ratio reduced by 16kg/t, and ending the calculation.
Example 2
Step 1, obtaining 3200m of a certain iron and steel plant 3 The material condition of the blast furnace, a certain iron and steel plant is at presentUsing coke A, coal dust B, mixed ore and mixed solvent, and further having decarbonized and denitrified blast furnace gas (containing 5% CO) 2 ) Biomass a.
Step 2, calculating the initial coke ratio and the coal ratio of the target blast furnace, and calculating the material balance and the heat balance by using the raw fuel and the process parameters of the target blast furnace, wherein the raw process parameters mainly comprise: distribution ratio of element into pig iron: η (eta) Fe ＝99.75％，η Mn =60.05%; the slag basicity R is 1.25; degree of direct iron reduction r d 0.5; the temperature of the top gas is 159 ℃, the oxygen enrichment rate is 0.01, etc. Without blowing CO 2 Under the condition of coal gas, the raw coke ratio C meeting the forward running of the blast furnace is obtained Coke 0 Sum coal ratio C Coal 0 355kg/t and 160kg/t, respectively.
Step 3, determining the content of CO 2 Quantity of injected gas V Air flow The biomass addition amount decreases the gradient value k 1 Reduced gradient value k of coke ratio and coal ratio 2 The range values of parameters such as unit biomass heat supply quantity, gas utilization rate, theoretical combustion temperature and the like are calculated according to collected historical production data and theory of the blast furnace of the steel plant, and the range values of important process parameters are obtained: the gas utilization rate is less than or equal to 0.48 and less than or equal to 0.49; the theoretical combustion temperature is less than or equal to 2100 ℃ and less than or equal to 2250 ℃. According to the requirements and reserves in the factory, the CO is contained 2 The gas injection quantity is 60m 3 T, biomass addition reduction gradient value k 1 The biomass heat supply quantity q per unit is 0.025GJ/kg, the reduction gradient value of the coke ratio and the coal ratio is 2kg/t, and only coal is reduced.
Step 4, the blast furnace contains CO 2 Calculation of the amount of gas injection corresponding to the amount of thermally compensated biomass injection required
S1: containing CO 2 The addition amount of the gas is 60m 3 T, keeping the original coke ratio, the coal ratio and other technological parameters unchanged, and calculating to obtain an absolute difference value Q of heat balance Difference of difference The initial biomass addition amount a was calculated to be-0.075 GJ/t 0 =0.075/0.025=3.00 kg/t, when biomass is added in an amount of a=a 0 ＝3.00kg/t；
S2: calculating material and heat balance according to the calculated biomass addition amount of 3.00kg/t, the coke ratio and the coal ratio of 355kg/t and 160kg/t respectively, judging that the heat balance is not met, reducing the biomass addition amount to 2.90kg/t, then calculating the material and heat balance, repeating the above operation until the material balance and heat balance are met when the biomass addition amount is reduced to 2.60kg/t, and performing the next step of judgment and calculation;
s3: according to the theoretical combustion temperature and the gas utilization rate which are respectively 2140 ℃ and 0.456 when the biomass addition amount in S2 is 2.60kg/t, wherein the gas utilization rate does not meet the constraint interval, the coal ratio is reduced to 158kg/t in a mode of only reducing the coal, other process parameters are kept unchanged, and the absolute difference value Q of heat balance is calculated Difference of difference At 0.002GJ/t, no further biomass is required, i.e. b 1 At 0kg/t, the biomass addition amount at this time was a 1 ＝a 0 +b 1 ＝2.60+0＝2.60kg/t；
S4: according to the calculated biomass addition quantity a 1 And repeating the steps S2-S3, wherein when the 16 th step is repeated, the coke ratio and the coal ratio are 355kg/t and 128kg/t respectively, the biomass addition amount is 9.52kg/t, the material balance and the heat balance are calculated and met, and the theoretical combustion temperature and the gas utilization rate are 2150 ℃ and 0.482 respectively, and are in a constraint interval.
And 5, outputting a coke ratio of 355kg/t, a coal ratio of 128kg/t, a biomass addition amount of 9.52kg/t, and a fuel ratio of 32kg/t to finish calculation.
Example 3
Step 1, obtaining 3200m of a certain iron and steel plant 3 In the case of blast furnace materials, a certain iron and steel plant currently uses coke A, coal dust B, mixed ore and mixed solvent, and in addition, has decarbonized and denitrified blast furnace gas (containing 7% CO) 2 ) Biomass a.
Step 2, calculating the initial coke ratio and the coal ratio of the target blast furnace, and calculating the material balance and the heat balance by using the raw fuel and the process parameters of the target blast furnace, wherein the raw process parameters mainly comprise: distribution ratio of element into pig iron: η (eta) Fe ＝99.75％，η Mn =60.05%; the slag basicity R is 1.25; degree of direct iron reduction r d 0.5; the temperature of the top gas is 159 ℃, the oxygen enrichment rate is 0.01, etc. Without blowing CO 2 Under the condition of coal gas, the raw coke ratio C meeting the forward running of the blast furnace is obtained Coke 0 Sum coal ratio C Coal 0 355kg/t and 160kg/t, respectively.
Step 3, determining the content of CO 2 Quantity of injected gas V Air flow The biomass addition amount decreases the gradient value k 1 Reduced gradient value k of coke ratio and coal ratio 2 The range values of parameters such as unit biomass heat supply quantity, gas utilization rate, theoretical combustion temperature and the like are calculated according to collected historical production data and theory of the blast furnace of the steel plant, and the range values of important process parameters are obtained: the gas utilization rate is less than or equal to 0.47 and less than or equal to 0.49; the theoretical combustion temperature is less than or equal to 2100 ℃ and less than or equal to 2250 ℃. According to the requirements and reserves in the factory, the CO is contained 2 The gas injection quantity is 60m 3 T, biomass addition reduction gradient value k 1 The biomass heat supply quantity q per unit is 0.025GJ/kg, the reduction gradient value of the coke ratio and the coal ratio is 2kg/t, and only the coke is reduced.
Step 4, the blast furnace contains CO 2 Calculation of the amount of gas injection corresponding to the amount of thermally compensated biomass injection required
S1: containing CO 2 The addition amount of the gas is 60m 3 T, keeping the original coke ratio, the coal ratio and other technological parameters unchanged, and calculating to obtain an absolute difference value Q of heat balance Difference of difference The initial biomass addition amount a was calculated to be-0.094 GJ/t 0 =0.094/0.025=3.73 kg/t, when biomass is added in an amount of a=a 0 ＝3.73kg/t；
S2: calculating material and heat balance according to the calculated biomass addition amount of 3.73kg/t, the coke ratio and the coal ratio of 355kg/t and 160kg/t respectively, judging that the heat balance is not met, reducing the biomass addition amount to 3.63kg/t, then calculating the material and heat balance, repeating the above operation until the material balance and heat balance are met when the biomass addition amount is reduced to 3.13kg/t, and carrying out the next step of judgment and calculation;
s3: according to the theoretical combustion temperature and the gas utilization rate which are calculated when the biomass addition amount in S2 is 3.13kg/t and are 2132 ℃ and 0.455 respectively, wherein the gas utilization rate does not meet the constraint interval, the coke ratio is reduced to 353kg/t in a mode of only reducing coke, other process parameters are kept unchanged, and the absolute difference value Q of heat balance is calculated Difference of difference At-0.0018 GJ/t, biomass addition amount b 1 At 0.07kg/t, the biomass addition amount at this time was a 1 ＝a 0 +b 1 ＝3.13+0.07＝3.20kg/t；
S4: according to the calculated biomass addition quantity a 1 And repeating the steps S2-S3, wherein when the 13 th step is repeated, the coke ratio and the coal ratio are 329kg/t and 160kg/t respectively, the biomass addition amount is 10.10kg/t, the material balance and the heat balance are calculated and met, and the theoretical combustion temperature and the gas utilization rate are 2100 ℃ and 0.474 respectively and are in a constraint interval.
And 5, outputting a coke ratio of 329kg/t, a coal ratio of 160kg/t, a biomass addition amount of 10.10kg/t, and a fuel ratio reduced by 26kg/t, and ending the calculation.
The following is noted: the biomass addition amount can be stored as a limit value, and when the biomass addition amount exceeds the limit value in the calculation process, the biomass addition amount can be controlled by reducing the content of CO 2 The parameters such as the gas injection quantity or the direct reduction degree are adjusted, and the calculation mode is unchanged. In addition, by calculating for a plurality of times under the same condition, a biomass addition amount scheme with the lowest fuel ratio can be obtained.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (13)
1. The method for measuring the addition amount of the biomass injected by the blast furnace is characterized by comprising the following steps of:
s1, calculating material balance and heat balance according to target raw materials and process parameters to obtain a raw coke ratio and a coal ratio which meet the forward running of a blast furnace;
s2 according to the content of CO 2 Calculating heat balance by using the coal gas addition amount, and calculating initial biomass addition amount a according to biomass unit heat supply amount 0 ；
S3, measuring and calculating material balance and heat balance according to the biomass addition amount, and if the material balance and the heat balance are not met, determining a gradient k 1 Reducing biomass addition toThe material balance and the heat balance are satisfied;
s4, after S3 is met, judging whether the theoretical combustion temperature and the gas utilization rate are in a constraint interval, and if not, determining the gradient k 2 And (3) reducing the raw coke ratio and the coal ratio, calculating the absolute difference of heat balance and the corresponding biomass addition amount, returning to the step (S3), repeating the step (S3) and the step (S4) until the requirements of the two steps are met at the same time, and outputting smelting parameters.
2. The method of measuring biomass addition amount for blast furnace injection according to claim 1, wherein the judgment basis in step S2 is that the balance is equal to the balance = (income-expense)/income is equal to 100%. Times.0.50%.
3. The method for measuring the addition amount of biomass injected into a blast furnace according to claim 1, wherein the means for reducing the raw coke ratio and the coal ratio in step S4 comprises: the full coke reduction ratio, the full coal reduction ratio and the coke ratio and the coal ratio are simultaneously reduced according to the same proportion.
4. CO-containing material 2 The ironmaking method by coupling coal gas and biomass injection is characterized by comprising the following steps of:
collecting CO-containing 2 Gas, biomass composition, type, and reserves data;
measuring the biomass addition by the method according to any one of claims 1 to 3 and outputting smelting parameters;
guiding a blast furnace to carry out biomass addition and CO-containing injection according to smelting parameters 2 And (3) gas.
5. The CO-containing product of claim 4 2 The ironmaking method by coupling coal gas and biomass injection is characterized by comprising the following steps of: blast furnace blown CO-containing 2 Coal gas, including decarbonized and denitrified blast furnace gas, coke oven gas and CO-containing gas 2 Industrial waste gas.
6. The CO-containing product of claim 4 2 The ironmaking method by coupling coal gas and biomass injection is characterized by comprising the following steps of: at different levels of CO 2 Under the conditions of the types and the components of the coal gas and the biomass, the CO content is calculated 2 Biomass addition amount, coke ratio and coal ratio corresponding to different injection amounts of coal gas.
7. CO-containing material 2 The utility model provides an ironmaking system of coal gas and living beings jetting coupling which characterized in that:
the system comprises a background analysis system and a front-end use system;
the background analysis system includes: the material basic data storage and processing module; a material balance and heat balance measuring and calculating module; a biomass additive amount calculation module;
the front end use system includes: a material basic parameter input module; a metallurgical process parameter input module; a smelting parameter constraint interval input module; a low-carbon smelting parameter output module;
the calculation logic of the biomass addition calculation module is the method according to any one of claims 1-3.
8. The CO-containing product of claim 7 2 The utility model provides an ironmaking system of coal gas and living beings jetting coupling which characterized in that: the material basic data storage and processing module comprises: CO-containing to be collected 2 The components, reserves and performance index data of coal gas, biomass and other blast furnace materials are stored and the missing value and abnormal value are processed.
9. The CO-containing product of claim 7 2 The utility model provides an ironmaking system of coal gas and living beings jetting coupling which characterized in that: the material balance and heat balance measuring and calculating module comprises: according to the given raw materials and technological parameter conditions, calculating the gas components and gas quantity of the furnace top, the pig iron components, the gas quantity and components of a tuyere convolution zone, the heat release quantity and the reduction heat absorption quantity of the furnace combustion, judging whether the materials are balanced and the heat is balanced, and judging whether the parameter indexes of the gas utilization rate and the theoretical combustion temperature meet constraint conditions.
10. The CO-containing product of claim 7 2 Coal gas and biomass injection couplingIs characterized in that: the material basic parameter input module is as follows: the parameters entered include: coke, coal dust, iron-containing furnace burden, biomass and CO 2 Composition, reserves, heating value and base characteristic data of the gas.
11. The CO-containing product of claim 7 2 The utility model provides an ironmaking system of coal gas and living beings jetting coupling which characterized in that: the smelting process parameter input module is as follows: the parameters entered include: blast furnace burden structure, blast furnace smelting element distribution rate, slag alkalinity, blowing medium temperature and CO content 2 The parameter values of the gas injection quantity, the direct reduction degree and the oxygen enrichment rate.
12. The CO-containing product of claim 7 2 The utility model provides an ironmaking system of coal gas and living beings jetting coupling which characterized in that: the smelting parameter constraint interval input module is used for inputting constraint ranges of theoretical combustion temperature and gas utilization rate.
13. The CO-containing product of claim 7 2 The utility model provides an ironmaking system of coal gas and living beings jetting coupling which characterized in that: the low-carbon smelting parameter output module outputs the coke ratio, the coal ratio and the corresponding biomass addition amount meeting the low-carbon smelting requirement through calculation of the heat difference value, and guides the blast furnace to spray and blow the carbon monoxide-containing material 2 And (3) gas.
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