CN106467929A - Multiple target blast furnace process operation carbon emission optimization method - Google Patents
Multiple target blast furnace process operation carbon emission optimization method Download PDFInfo
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- CN106467929A CN106467929A CN201510517814.7A CN201510517814A CN106467929A CN 106467929 A CN106467929 A CN 106467929A CN 201510517814 A CN201510517814 A CN 201510517814A CN 106467929 A CN106467929 A CN 106467929A
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Abstract
Multiple target blast furnace process operation carbon emission optimization method of the present invention is based on substance conservation and law of conservation of energy, using linear programming method, with cost and CO2Discharge capacity is target, establishes ironmaking system carbon emission Optimized model, to optimize the CO of different aspects2Discharge capacity.Single goal and multiple-objection optimization are carried out to 3 Optimized models respectively using Ligo9.0 software programming program, draws the optimum results under different target, the ironmaking system Optimized model of foundation multiple-objection optimization can make cost and CO2Discharge capacity reaches optimum relatively, and the optimum results scheme of therefore ironmaking system Model for Multi-Objective Optimization has guiding significance to the production of actual iron and steel enterprise.
Description
Technical field
The present invention relates to production field of energy-saving technology, more particularly, to multiple target blast furnace process operation carbon emission optimization method.
Background technology
Since entering 21 century, Chinese crude steel yield average growth rate per annum reaches 15.52%, is 7.17 hundred million tons within 2012, accounts for the 46.3% of world's crude steel yield then.The fast development of China's steel industry brings a series of problems, such as resource, the energy and environment.In CO2Discharge aspect, China's steel industry CO in 20122Discharge capacity accounts for the 16.9% of national total release, and the situation is tense for reduction of discharging.《Steel and iron industry " 12 " development plan》Propose, during " 12 ", steel and iron industry CO2Discharge capacity will reduce by 18%, and this brings huge challenge to the development of Science in Future in China steel and iron industry.Therefore, reduce iron and steel enterprise CO2Discharge capacity, reduce production cost to Chinese Iron ＆ Steel Enterprises, survival and development from now on have very important significance.
Steel and iron manufacturing industry is CO2The main source of discharge, becomes the third-largest CO of China2Discharge industry.China is iron and steel manufacturing country maximum in the world again, and steel and iron industry accounts for the 15.2 of total energy consumption, the CO of steel and iron industry2In discharge, the energy（Fuel）Consume discharged CO2Amount accounts for steel and iron industry CO2More than the 95% of total emission volumn.China's steel and iron industry dependency degree main energy sources are coal resources.How to reduce enterprise's coal energy consumption, reduce production cost, reduce steel and iron industry CO2Discharge capacity, makes enterprise turn to Intensive growth, Development of Novel progress in industrialization by extensive management, becomes the problem of many experts, scholar's research.In iron and steel produces, the CO that blast furnace ironmaking is discharged2Account for the overwhelming majority of whole production process, reduce blast furnace ironmaking energy resource consumption, reduce CO2Discharge capacity, is replaced Fossil fuel, is optimized the important measures that blast-furnace equipment etc. is following energy-saving and emission-reduction using new cleaning fuel.
Content of the invention
Present invention is generally directed to the sintering circuit being closely related and blast furnace operation set up operation carbon emission Optimized model with material stream production in ironmaking system, set up ironmaking system carbon emission Optimized model simultaneously, analysis is optimized from different aspects.
For reaching this purpose, the present invention employs the following technical solutions：Single goal and Model for Multi-Objective Optimization are set up using Lingo9.0 software, the production making each operation from entirety cooperates, the target finally realizing system optimization model is optimum；Multiple-objection optimization can make cost and CO2Discharge capacity reaches optimum relatively.
Brief description
Fig. 1 burden cost is to molten iron cost and CO2The impact of discharge capacity.
Fig. 2 grade of ore is to molten iron cost and CO2The impact of discharge capacity.
Fig. 3 emission factor is to CO2The impact of discharge capacity.
Specific embodiment
With reference to specific embodiment, the technical scheme improvement that the present invention is reduced with C element stream in blast furnace process operation is described in further detail.
Blast furnace is a large-scale counter-current reactor, and the raw material such as iron ore, coke loads from upper blast furnace, through the air of preheating（It is frequently accompanied by coal dust, the injection material such as oxygen-enriched）Blast from the air port of bottom, during furnace charge declines, Ore is gradually either directly or indirectly reduced the cost pig iron, generate blast-furnace slag and blast furnace gas simultaneously.Because the chemical reaction within blast furnace is extremely complex, therefore, when setting up blast furnace operation Optimized model, blast furnace is considered as all important reactions in a black-box model, rather than analog blast furnace.
Case 1：The cost of blast furnace feeding dispensing changes to ton ferrum cost and CO2The impact of discharge capacity.
As shown in figure 1, by blast furnace feeding dispensing（x1~x11）Cost reduce a unit when, the change of ton ferrum cost is more notable, to ton ferrum CO2The influence amount of discharge capacity is simultaneously little.Wherein sintering deposit（x1）Cost reduce unit reduces cost 3.96%, reduce CO2Discharge capacity 1.04%, influence degree is maximum.Next to that coke（x10）.Therefore, reduce sintering deposit cost, reduce blast furnace coke ratio, increasing coal ejection ratio is to reduce ton ferrum cost and CO2The effective way of discharge capacity.
Case 2：The grade entering stove Ore is to ton ferrum cost and CO2The impact of discharge capacity.
In blast furnace feeding Ore, the grade unit change of sintering deposit is to ton ferrum cost and CO2The impact of discharge capacity is maximum, as shown in Figure 2.Enter stove Ore when blast furnace（x1~x9）Grade improve a unit when, only sintering deposit（x1）The change reduces cost 0.88% of grade, reduces ton ferrum CO2Discharge capacity 0.34%.So, the grade improving blast furnace feeding sintering deposit can effectively reduce blast furnace ironmaking cost and CO2Discharge.
Case 3：Carbon emission factor pair ton ferrum CO2The impact of discharge capacity.
Put into the material of blast furnace and the energy, and blast furnace operation produce product, side-product etc. is to blast furnace operation CO2Discharge capacity has certain contribution, below main research put in blast furnace operation the carbon emission potentiality of various furnace charges and carbon emission factor unit change to ton ferrum CO2Discharge capacity and the influence degree of cost.As shown in figure 3, in the material that used of blast furnace and the energy, Ore（x1~x9）To ton ferrum CO2The contribution of discharge capacity is less, and the energy is larger to carbon emission potentiality, wherein coke（x10）, blast furnace air（x15）, coal dust（x11）With BFG consumption（x13）With BFG generating capacity（x16）To ton ferrum CO2Discharge capacity contribution is the most prominent, and when the value of the carbon emission factor reduces a unit, each optimized variable is to ton ferrum CO2The influence degree of discharge capacity is also different.Wherein blast furnace air（x15）The emission reduction effect of blast furnace operation is affected maximum, next to that BFG, coke, blast furnace slag and coal dust.Blast furnace reduces discharging will make an effort in terms of " reduce consume " and " increasing recovery " two.
Claims (1)
1. multiple target blast furnace process operation carbon emission optimization method it is characterised in that：Influence factor in bf model only selects to directly affect the variable of object function；Many indirect acting factors, as grade of sinter, sintering deposit cost, hot blast temperature, calorific value of gas etc. are all set to definite value (practical condition according to iron and steel enterprise sets) in a model, the optimal value of these parameters is not given in optimum results, and in order to the impact to target for these parameters is described, it can be analyzed discuss according to the model set up in interpretation of result；
Practicality based on model considers, blast furnace operation Optimized model is with CO2Discharge capacity and cost are object function；Introduce the expression formula of this two object functions separately below；
The expression of object function one：CO2Discharge capacity object function：
In formula, PCEglFor the carbon emission amount of blast furnace operation, tCO2/t；EF is the carbon emission factor, tCO2/unit；It is the carbon emission amount of other power consumptions in addition to blast furnace air, tCO2/t；X is optimized variable, unit/t；
The expression of object function two：Cost objective function：
In formula, PglFor the cost of blast furnace ironmaking, unit/t；piFor the unit price of each variable, unit/unit；X is optimized variable, unit/t；
The expression of object function three：Multiple objective function
F (y)=(PCEgl(y),Pgl(y))
Constitute model constraints be respectively：Constraints of Equilibrium, process constraint, external environment constraint (including particular constraints and other constraint)；
Process constraint：
(1) blast-furnace slag basicity：Basicity of slag is selected according to material composition, pig iron kind etc.；
(5) content of MgO in slag
(6) product parameters constraint
The elements such as silicon, manganese, phosphorus, sulfur, ferrum, carbon are the main components of molten iron, and from the regression nature of pig iron composition, the percentage composition sum of each element in molten iron is 1, that is,
x17+x18+x19+x20+x21+x22=1
The pig iron contains S amount constraint
x19≤0.0003
Pig iron si content constrains
0.002≤x17≤0.008
Meanwhile it is necessary to ensure that in the pig iron, the content of every kind of element not can exceed that 1；
Constraints of Equilibrium：
(1) Fe element balance equation
In formula, μFeFor apportionment ratios in molten iron for the ferrum element；
(2) C element equilibrium equation
In formula,For generating CH4Carbon amounts account for ratio into stove total carbon, %；φ is blast humidity, %；rdDirect reduction degree for ferrum；For air blast oxygen enrichment percentage, %；
(3) P element balance
In formula, μPFor apportionment ratios in molten iron for the P elements, %；
(4) S element balance
In formula, μSFor apportionment ratios in molten iron for the element sulphur, %
(5) Mn element balance
In formula, μMnFor apportionment ratios in molten iron for the manganese element, %
(6) quantity of slag balance
Slag is essentially from the stone-like pulse in Ore, the ash in coke and flux etc.；The oxide of composition blast furnace slag has many kinds, and the calculating of the blast furnace quantity of slag is mainly passed through just to add up various constituents and obtain；In this model, the main component of blast-furnace slag is S, FeO, MnO, SiO2、CaO、Al2O3, seven kinds of MgO, quantity of slag equilibrium equation is
(7) blast furnace gas yield balance
Blast furnace gas is the by-product energy producing in metallurgical industry ironmaking production, is also one of main energy sources needed for blast fumance；Be characterized in that dustiness is big, be difficult to catch fire, combustion instability, calorific value low, be mainly used in blast funnace hot blast stove, coke oven, station boiler and use heater for rolling steel of high coke mixed gas etc.；Coal gas main component has CO2、CO、N2、H2、CH4, the amount of each composition is calculated as follows：
1)CH4：A small amount of C and H in high-temperature region2Reaction generates CH4, CH in coke volatile component4It is CH in coal gas4Main source；
2)H2：H in blast furnace gas2It is mainly derived from the H that moisture in blast furnace air decomposites2, organic H in coke2, H in volatile matters2, and the H in pulverized coal injection2Deng；
In formula, α represents the H participating in reduction reaction under the conditions of injection2Account for total H2The ratio of amount, %；
3)CO2：With the rising of blast furnace gas, indirect reduction consumes the CO of unit volume, remains to generate the CO of a unit2, so the indirect reduction reaction of CO, and the decomposition reaction of carbonate etc. makes CO in coal gas2Main source；
4)CO：High-temperature region before air port, because the direct reduction reactor of the elements such as ferrum and S, Mn, P generates the CO of a part, has the CO that part thereof decomposites in high-temperature region simultaneously2With C effect, generate substantial amounts of CO, but in middle warm area, because CO participates in indirect reduction reaction, consume substantial amounts of CO simultaneously；
5)N2：N in coal gas2Most of N in blast furnace air2, come from the organic N in coke on a small quantity2With the N in ash2, and N2Do not participate in chemical reaction, so absolute magnitude is constant；
(8) material balance
x1+x2+x3+x4+x5+x6+x7+x8+x9+x10+x11+x12+ρBFG·x13+ρCOG·x14+ρAir·x15=1000+ ρBFG·x16+x23
(9) thermal balance
During blast furnace process, enter the effect of the fuel not only reducing agent to be served as in blast furnace, and the enough heats of stove to be supplied to；Heat almost all needed for blast furnace is supplied by the burning of fuel, and in fuel, the essential element of combustion heat release is then carbon, so thermal balance constraint is one of important restrictions condition that model is set up；Calculated using the second heat balance method more truly reflecting situation in stove herein.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113219932A (en) * | 2021-06-02 | 2021-08-06 | 内蒙古自治区计量测试研究院 | Digital analytic system of thermal power trade carbon emission |
| CN113699293A (en) * | 2021-08-30 | 2021-11-26 | 中冶赛迪工程技术股份有限公司 | Method for determining minimum coke ratio in blast furnace smelting |
| CN115630268A (en) * | 2022-11-01 | 2023-01-20 | 鞍钢股份有限公司 | Evaluation model, evaluation method and evaluation system for carbon emission of long-flow iron and steel enterprise |
| WO2023071422A1 (en) * | 2021-10-28 | 2023-05-04 | 广东邦普循环科技有限公司 | Accounting system for carbon emissions of lithium battery positive electrode material sintering |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113219932A (en) * | 2021-06-02 | 2021-08-06 | 内蒙古自治区计量测试研究院 | Digital analytic system of thermal power trade carbon emission |
| CN113219932B (en) * | 2021-06-02 | 2023-09-05 | 内蒙古自治区计量测试研究院 | Digital analysis system for carbon emission in thermal power generation industry |
| CN113699293A (en) * | 2021-08-30 | 2021-11-26 | 中冶赛迪工程技术股份有限公司 | Method for determining minimum coke ratio in blast furnace smelting |
| CN113699293B (en) * | 2021-08-30 | 2022-08-12 | 中冶赛迪工程技术股份有限公司 | Method for determining minimum coke ratio in blast furnace smelting |
| WO2023071422A1 (en) * | 2021-10-28 | 2023-05-04 | 广东邦普循环科技有限公司 | Accounting system for carbon emissions of lithium battery positive electrode material sintering |
| CN115630268A (en) * | 2022-11-01 | 2023-01-20 | 鞍钢股份有限公司 | Evaluation model, evaluation method and evaluation system for carbon emission of long-flow iron and steel enterprise |
| CN115630268B (en) * | 2022-11-01 | 2023-10-20 | 鞍钢股份有限公司 | Establishment method, assessment method and assessment system of long-flow steel enterprise carbon emission assessment model |
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Application publication date: 20170301 |