CN101463404B - Production process for producing spongy iron by dry coal powder gasification in high furnace - Google Patents
Production process for producing spongy iron by dry coal powder gasification in high furnace Download PDFInfo
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- CN101463404B CN101463404B CN2007100931713A CN200710093171A CN101463404B CN 101463404 B CN101463404 B CN 101463404B CN 2007100931713 A CN2007100931713 A CN 2007100931713A CN 200710093171 A CN200710093171 A CN 200710093171A CN 101463404 B CN101463404 B CN 101463404B
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Abstract
The invention belongs to the metallurgical chemistry technology, in particular to a technology for producing sponge iron by a dry coal powder gasification shaft furnace. Primary reduction gas is produced from dry coal powder and oxygen by a gasification furnace and desulfurization and slag-tap are carried out inside the gasification furnace. The primary reduction gas is cooled, removed dust in a dry way and heated. A part of synthetic gas is sent to the coal powder gasification furnace after wet desulfurization and pressurization, and the other part of the primary reduction gas is sent to a heating section. The primary reduction gas is heated by a partial oxidation process to obtain reduction gas. The reduction gas, lump ore and pellet ore are put into an input shaft furnace respectively. The lump ore and the pellet ore are reduced into the sponge iron in the shaft furnace. Coal gas from the shaft furnace is washed and then pressure energy is recycled by TRT. The invention can produce the sponge iron from the coal power of non-coking coal in the shaft furnace. The invention realizes low-energy consumption production and clean production and causes no dirt of hydroxybenzene and cyanide and the pollution during coking and sintering processes. Shaft furnace coal gas can be used for manufacturing chemical products and CCPP power generation. The invention provides chance for steel-chemical industry and steel-power generation combined enterprises.
Description
Technical field
The present invention is the production technique that belongs to metallurgical chemistry technology type, particularly a kind of producing spongy iron by dry coal powder gasification high furnace.
Background technology
Sponge iron is a kind of good source of iron, is electric furnace refining Clean Steel, the indispensable impurity thinner of high-quality steel, also is the best refrigerant of converter steelmaking, and the output of whole world sponge iron and sponge iron hot wafering is own near 6,000 ten thousand t/a.To be the gas base produce with shaft furnace the sponge iron major part in the world, also directly produces with rotary kiln with coal a small amount of.The main stream approach of the production of shaft furnace has two kinds of Midrex and HYL, and the overall throughput of seeing Midrex from throughput is far above the HYL method, but Midrex is the normal pressure shaft furnace, and reduction pressure not too is fit to be complementary with high pressure coal gasification stove about 0.1MPa.HYL method reduction pressure can be about 0.5MPa, helps the coupling with high pressure coal gasification stove relatively, and can dwindle the diameter of reduction shaft furnace.HYL directly reduction is a Mexico HYLSA company proprietary technology, also live through updating and evolution from HYL-I to HYL-III, mainstream technology is HYL-III at present, oneself has Shi Duojia the manufacturer that it adopts in the world, the equipment overall throughput is more than 1,100 ten thousand t/a, and maximum separate unit throughput reaches 1,100,000 t/ platform a.World's sponge iron production mainstream technology is the also original production of shaft furnace gas base, and fuel is to use Sweet natural gas.China can not get due development because of the natural gas source poorness makes sponge iron production, and China's sponge iron output also has only 60-80 ten thousand t/a, mainly is that the big seamless cover coal-based rotary kiln production equipment of having introduced in Tianjin is produced with non-mainstream technology.Domestic shaft furnace is produced sponge iron does not also have the scale operation device, and the report of exploitation with coke-oven gas production sponge iron also arranged, and invar ironworks coke-oven gas is also very valuable, also can not form the weather of scale operation.
Summary of the invention
The production technique that the purpose of this invention is to provide a kind of producing spongy iron by dry coal powder gasification high furnace.The present invention produces reducing gas just with passing through coal pulverizer pulverizing and exsiccant dry coal powder and oxygen through vapourizing furnace, and gasification pressure is 0.6MPa～0.7MPa; First reducing gas (the CO+H that produces
2)＞90%, (CO
2+ H
2O)/(CO+H
2+ CO
2+ H
2O)＜5%, vapourizing furnace desulfuration in furnace slag tap, first reducing gas are through cooling, dry gas cleaning, heating, and a first reducing gas part is sent into powder coal gasification furnace after the process wet desulphurization pressurization again outside stove, another part just reducing gas is sent into heating zone, and first reducing gas obtains H after heating through the partial oxidation method
2/ CO=0.15～6 and H
2S content reaches the following reducing gas of 350ppm, and reducing gas and lump ore pellet advance to import shaft furnace respectively, and lump ore and pellet are reduced into sponge iron in shaft furnace, and the coal gas that goes out shaft furnace is through washing the back by TRT pressure recovery energy.This technology can not only overcome the limitation of Sweet natural gas system gas in the gas base method, and can form scale operation, produces sponge iron with the fine coal of non-coking coal, realizes less energy-consumption production, and cleaner production does not have phenol, cyanogen to pollute; Do not have the pollution of coking of blast furnace ironmaking process and sintering circuit, reach CO
2The reduction of discharging target.
Purpose of the present invention realizes by following proposal: vapourizing furnace is with partly pure oxygen (maybe can mix small amount of steam) is with coal gasification, and gasification pressure can be used 0.6MPa～0.7MPa; First reducing gas (the CO+H that produces
2)＞90%, (CO
2+ H
2O)/(CO+H
2+ CO
2+ H
2O)＜5%, vapourizing furnace adds Wingdale slag tap desulfuration in furnace; 950 ℃ to 250 ℃ of vapourizing furnace waste heat boiler coal gas temperature drop scopes; The dedusting dry collector of first reducing gas behind the waste heat boiler; Reducing gas heating just after the dedusting; For preventing that the high first reducing gas of CO content from analysing carbon in heat-processed, adopt two step heating methods, the low-temperature zone below 450 ℃ is with tube furnace or interchanger, 450 ℃-850 ℃ interval partial oxidation methods of using; Lump ore is reduced gas (H in shaft furnace
2/ CO=0.15～6) be reduced into sponge iron, 850 ℃ of reduction temperatures, the degree of metalization of sponge iron 〉=92%; The coal gas that goes out shaft furnace is through washing the back by TRT pressure recovery energy.
Specifically, a kind of production technique of producing spongy iron by dry coal powder gasification high furnace is characterized in that: pulverizing of process coal pulverizer and exsiccant dry coal powder and oxygen are produced reducing gas just through vapourizing furnace, and the first reducing gas of production is CO+H
2＞90%, (CO
2+ H
2O)/(CO+H
2+ CO
2+ H
2O)＜5%, vapourizing furnace desulfuration in furnace slag tap, first reducing gas are through cooling, dry gas cleaning and heating, and a first reducing gas part is sent into powder coal gasification furnace after the process wet desulphurization pressurization again outside stove, another part just reducing gas is sent into heating zone, and first reducing gas obtains H after heating through the partial oxidation method
2/ CO=0.15～6 and H
2S content reaches the following reducing gas of 350ppm, and reducing gas and lump ore pellet advance to import shaft furnace respectively, and lump ore and pellet are reduced into sponge iron in shaft furnace, and the coal gas that goes out shaft furnace is through washing the back by TRT pressure recovery energy.
Above-mentioned powder coal gasification furnace pressure 0.65MPa-0.7MPa, and add Wingdale slag tap desulfuration in furnace.
The gas of above-mentioned powder coal gasification furnace is with ℃ go out vapourizing furnace through the first reducing gas Quench to 950 of desulfurization.
Above-mentioned reducing gas dry gas cleaning just is that porcelain filter or sack cleaner dry gas cleaning purify.
Above-mentioned reducing gas just adds the thermal recovery two step method, tube furnace heating and partial oxidation method, and 250 ℃ to 450 ℃ with the tube furnace heating, and 450 ℃ to 850 ℃ with the heating of partial oxidation method, through obtaining H after the heating of partial oxidation method
2/ CO=0.15～6 and H
2S content reaches the reducing gas of following 850 ℃ of 350ppm.
Above-mentioned vapourizing furnace is produced reducing gas just with dry coal powder and part pure oxygen.
Invention effect: can produce sponge iron with shaft furnace with the coal gasification of non-coking coal.The realization less energy-consumption is produced, and the production energy consumption of sponge iron is lower than the about 20～50kg/t of blast-melted production energy consumption
FERealize cleaner production, do not have phenol, cyanogen dirt.There is not the pollution of coking of blast furnace ironmaking process and sintering circuit.Shaft furnace coal gas can be used to make Chemicals and CCPP generating, for iron and steel one by one chemical industry, the iron and steel associated enterprises that generates electricity one by one offer an opportunity.
Description of drawings
Accompanying drawing is technical process of the present invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are further described:
Non-coking coal is made coal dust through coal pulverizer, send into powder coal gasification furnace (shell) after the drying, simultaneously, the oxygen that oxygen station is made is sent into powder coal gasification furnace (shell), powder coal gasification furnace (shell) pressure is 0.65MPa～0.7MPa, the first reducing gas (CO+H of production
2)＞90%, (CO
2+ H
2O)/(CO+H
2+ CO
2+ H
2O)＜5%, and add Wingdale slag tap desulfuration in furnace, the slag of powder coal gasification furnace (shell) is discharged after treatment; The first reducing gas that goes out powder coal gasification furnace (shell) is lowered the temperature through waste heat boiler, and temperature drops to 250 ℃ by 950 ℃; Just reducing gas is after porcelain filter or sack cleaner dry gas cleaning purify, a part just reducing gas outside stove through sending into vapourizing furnace after the wet desulphurization pressurization, the gas of vapourizing furnace ℃ goes out vapourizing furnace with the first reducing gas Quench to 950 of process desulfurization; Another part just reducing gas is sent into heating zone, just reducing gas adds the thermal recovery two step method, tube furnace heating and partial oxidation method, 250 ℃ are heated with tube furnace to 450 ℃, 450 ℃ to 850 ℃ are heated with the partial oxidation method, just the reducing gas temperature is warmed up to 850 ℃ by 250 ℃, through obtaining H after the heating of partial oxidation method
2/ CO=0.15～6 and H
2S content reaches the following reducing gas of 350ppm; Reducing gas and lump ore pellet advance to import shaft furnace respectively, and shaft furnace pressure is 0.55MPa, and the lump ore pellet is reduced into sponge iron in shaft furnace, sponge iron sulphur content≤0.3%; The coal gas that goes out shaft furnace outputs to coal gas gaspipe network then or coal gas is heated laggard shaft furnace once more through washing the back by TRT pressure recovery energy.
The present invention can produce sponge iron with shaft furnace with the coal gasification of non-coking coal.The realization less energy-consumption is produced, and the production energy consumption of sponge iron is lower than the about 20-50kg/t of blast-melted production energy consumption
FERealize cleaner production, do not have phenol, cyanogen dirt.There is not the pollution of coking of blast furnace ironmaking process and sintering circuit.Shaft furnace coal gas can be used to make Chemicals and CCPP generating, for iron and steel one by one chemical industry, the iron and steel associated enterprises that generates electricity one by one offer an opportunity.
Claims (6)
1. the production technique of a producing spongy iron by dry coal powder gasification high furnace is characterized in that: pulverize and exsiccant dry coal powder and oxygen are produced reducing gas just through vapourizing furnace through coal pulverizer, the first reducing gas of production is CO+H
2＞90%, (CO
2+ H
2O)/(CO+H
2+ CO
2+ H
2O)＜5%, vapourizing furnace desulfuration in furnace slag tap, first reducing gas are through cooling, dry gas cleaning and heating, and a first reducing gas part is sent into powder coal gasification furnace after the process wet desulphurization pressurization again outside stove, another part just reducing gas is sent into heating zone, and first reducing gas obtains H after heating through the partial oxidation method
2/ CO=0.15～6 and H
2S content reaches the following reducing gas of 350ppm, and reducing gas and lump ore pellet advance to import shaft furnace respectively, and lump ore and pellet are reduced into sponge iron in shaft furnace, and the coal gas that goes out shaft furnace is through washing the back by TRT pressure recovery energy.
2. the production technique of the described producing spongy iron by dry coal powder gasification high furnace of claim 1 is characterized in that: powder coal gasification furnace pressure 0.65MPa-0.7MPa, and adding Wingdale slag tap desulfuration in furnace.
3. the production technique of the described producing spongy iron by dry coal powder gasification high furnace of claim 1 is characterized in that: the gas of powder coal gasification furnace is with ℃ go out vapourizing furnace through the first reducing gas Quench to 950 of desulfurization.
4. the production technique of the described producing spongy iron by dry coal powder gasification high furnace of claim 1 is characterized in that: first reducing gas dry gas cleaning is that porcelain filter or sack cleaner dry gas cleaning purify.
5. the production technique of the described producing spongy iron by dry coal powder gasification high furnace of claim 1, it is characterized in that: first reducing gas adds the thermal recovery two step method, tube furnace heating and partial oxidation method, 250 ℃ are heated with tube furnace to 450 ℃, 450 ℃ to 850 ℃ with the heating of partial oxidation method, through obtaining H after the heating of partial oxidation method
2/ CO=0.15～6 and H
2S content reaches the reducing gas of following 850 ℃ of 350ppm.
6. the production technique of the described producing spongy iron by dry coal powder gasification high furnace of claim 1 is characterized in that: reducing gas at the beginning of vapourizing furnace is produced with dry coal powder and part pure oxygen.
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|---|---|---|---|
| CN2007100931713A CN101463404B (en) | 2007-12-19 | 2007-12-19 | Production process for producing spongy iron by dry coal powder gasification in high furnace |
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|---|---|---|---|
| CN2007100931713A CN101463404B (en) | 2007-12-19 | 2007-12-19 | Production process for producing spongy iron by dry coal powder gasification in high furnace |
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|---|---|
| CN101463404A CN101463404A (en) | 2009-06-24 |
| CN101463404B true CN101463404B (en) | 2011-05-11 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101322903B1 (en) * | 2011-12-22 | 2013-10-29 | 주식회사 포스코 | Apparatus for manufacturing molten iron and method for manufacturing the same |
| CN103205516B (en) * | 2013-04-03 | 2015-05-06 | 北京首钢股份有限公司 | Method and device for desalting blast furnace gas |
| CN105278585B (en) * | 2014-07-25 | 2017-04-19 | 宝钢工程技术集团有限公司 | Coal gas control device used for COREX process and application method |
| CN104388627A (en) * | 2014-11-20 | 2015-03-04 | 中冶南方工程技术有限公司 | Dust removing method for coal gas of converter and system |
| CN104805248A (en) * | 2015-03-31 | 2015-07-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Device and method for reduction of coal-based pellets |
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2007
- 2007-12-19 CN CN2007100931713A patent/CN101463404B/en active Active
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