CN101463405A - Production method for producing spongy iron by dry coal powder gasification high furnace - Google Patents
Production method for producing spongy iron by dry coal powder gasification high furnace Download PDFInfo
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- CN101463405A CN101463405A CNA2007100931728A CN200710093172A CN101463405A CN 101463405 A CN101463405 A CN 101463405A CN A2007100931728 A CNA2007100931728 A CN A2007100931728A CN 200710093172 A CN200710093172 A CN 200710093172A CN 101463405 A CN101463405 A CN 101463405A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention belongs to metallurgical chemistry technology, in particular to a method for producing sponge iron by a dry coal powder gasification shaft furnace. Primary reduction gas is produced from dry coal powder which is crushed and dried in a coal pulverizer and oxygen by a gasification furnace. The produced primary reduction gas is cooled, removed dust, desulfurized and reheated. After the pressure of the primary reduction gas is reduced by turbine expansion power generation, the primary reduction gas is sent to a heating section to obtain reduction gas after being heated by a partial oxidation process. 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. Then, coal gas from the shaft furnace is washed and then is output to a coal gas pipe net, or the coal gas is reheated and then put into the shaft furnace. The invention not only overcomes the limitation of manufacturing gas by natural gas in a gas-based method, but also can form mass production. The invention produces the sponge iron from the coal power of non-coking coal, realizes low-energy consumption production and achieves the target of reducing the emission of CO2. The invention provides chance for steel-chemical industry and steel-power generation combined enterprises.
Description
Technical field
The present invention is the production method 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 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, existing more than ten families of 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 synthetic gas with the dry coal powder through vapourizing furnace, synthetic gas is through cooling, dedusting, desulfurization, reheat, after the turbine expansion generating reduces synthetic gas pressure, synthetic gas is sent into heating zone, synthetic gas obtains reducing gas after heating through the partial oxidation method, 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, then, the coal gas that goes out shaft furnace outputs to coal gas gaspipe network or coal gas is heated laggard shaft furnace once more after through washing.This technology can not only overcome the limitation of Sweet natural gas system gas in the gas base method, and can form scale operation, and the present invention produces sponge iron with the fine coal of non-coking coal, realizes less energy-consumption production, realizes 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 the reduction of discharging target of CO2.
Purpose of the present invention realizes by following proposal: vapourizing furnace is partly used pure oxygen (maybe can mix small amount of steam) coal gasification, and vapor pressure can be used 4-6MPa; Synthetic gas (the CO+H that produces
2) 90%, (CO
2+ H
2O)/(CO+H
2+ CO
2+ H
2O)＜5%, waste heat boiler is with two segment structure forms, one section (high temperature section) produces steam with synthetic gas, with synthetic gas by 950 ℃ of temperature drops to 250 ℃, use the dry collector dedusting, a part of synthetic gas after the dedusting is sent into vapourizing furnace after pressurization makes reducing gas Quench to 950 ℃ go out vapourizing furnace, another partly synthetic gas send into wet desulphurization, H
2S content drops to below the 20ppm, and coal gas is through the heating of second section low-temperature zone of waste heat boiler, with coal gas re-heat to 250 ℃ after the desulfurization; Is 0.1-0.15MPa with dry type turbine power generation unit with the synthetic gas step-down; Synthetic gas is sent into heating zone, prevent that the high synthetic 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, synthetic gas obtains (H after heating through the partial oxidation method
2/ CO=0.15～6) reducing gas, reducing gas and lump ore pellet advance to import shaft furnace respectively, lump ore and pellet are reduced into sponge iron in shaft furnace, and then, the coal gas that goes out shaft furnace outputs to coal gas gaspipe network or coal gas is heated laggard shaft furnace once more after washing.
The 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/tfe of blast-melted production energy consumption.Realize 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, and---chemical industry, iron and steel---generating associated enterprises offers an opportunity to be iron and steel.
Description of drawings
Accompanying drawing is technical process of the present invention
Embodiment
Below in conjunction with accompanying drawing technical process embodiment of the present invention is further described:
Non-coking coal is sent into powder coal gasification furnace after making coal dust through coal pulverizer, and simultaneously, the oxygen that oxygen station is made is sent into powder coal gasification furnace, powder coal gasification furnace design pressure 4.0Mpa, and the first reducing gas of production is (CO+H
2) 90%, (CO
2+ H
2O)/(CO+H
2+ CO
2+ H
2O)＜5%; The slag of powder coal gasification furnace is discharged after treatment; Just reducing gas is sent into waste heat boiler, waste heat boiler is with two segment structure forms, first section is high temperature section, produce steam with first reducing gas, first reducing gas by 950 ℃ of temperature drops to 250 ℃, is used the dry collector dedusting, and a part of reducing gas just after the dedusting is sent into vapourizing furnace after pressurization makes just reducing gas Quench to 950 ℃ go out vapourizing furnace, another partly first reducing gas is sent into wet desulphurization, H
2S content drops to below the 20ppm, after the desulfurization just reducing gas through second section low-temperature zone heating of waste heat boiler, with first reducing gas re-heat to 250 ℃; The synthetic gas of heating is reduced to 0.15MPa with dry type turbine power generation unit with pressure; Synthetic gas is sent into heating zone, 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, first reducing gas obtains (H after heating through the partial oxidation method
2/ CO=0.15～6) reducing gas, reducing gas and lump ore and pellet are imported shaft furnace respectively, and lump ore and pellet are reduced into sponge iron in shaft furnace, then, send sponge iron through the DRI output equipment; The coal gas that goes out shaft furnace outputs to coal gas gaspipe network or coal gas is heated laggard shaft furnace once more after washing.
This technology can not only overcome the limitation of Sweet natural gas system gas in the gas base method, and can form scale operation, and the present invention produces sponge iron with the fine coal of non-coking coal, realizes less energy-consumption production, realizes 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 the reduction of discharging target of CO2.Shaft furnace coal gas can be used to make Chemicals and gas turbine combined cycle power plant (CCPP), and---chemical industry, iron and steel---generating associated enterprises offers an opportunity to be iron and steel.
Claims (4)
1. the production method of a producing spongy iron by dry coal powder gasification high furnace, it is characterized in that: pulverizing of process coal pulverizer and exsiccant dry coal powder and oxygen are produced reducing gas just through vapourizing furnace, the first reducing gas of producing is CO+H2〉90%, CO2+H2O/CO+H2+CO2+H2O＜5%, just reducing gas is through cooling, dedusting, desulfurization, reheat, after the turbine expansion generating reduced first reducing gas pressure, first reducing gas was sent into heating zone, and first reducing gas obtains reducing gas H after heating through the partial oxidation method
2/ CO=0.15～6, 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 then, the coal gas that goes out shaft furnace outputs to coal gas gaspipe network or coal gas is heated laggard shaft furnace once more after washing.
2. the production technique of the described producing spongy iron by dry coal powder gasification high furnace of claim 1, it is characterized in that: vapourizing furnace pressure is 4-6MPa, shaft furnace pressure is 0.1-0.15MPa.
3. the production technique of the described producing spongy iron by dry coal powder gasification high furnace of claim 1, it is characterized in that: waste heat boiler is with two segment structure forms, first section (high temperature section) produces steam with first reducing gas, with first reducing gas by 950 ℃ of temperature drops to 250 ℃, use the dry collector dedusting, a part of reducing gas just after the dedusting is sent into vapourizing furnace after pressurization makes just reducing gas Quench to 950 ℃ go out vapourizing furnace, and another is reducing gas wet desulphurization just partly, H
2S content drops to below the 20ppm, after the desulfurization just reducing gas through second section low-temperature zone heating of waste heat boiler, with first reducing gas re-heat to 250 ℃.
4. the production technique of the described producing spongy iron by dry coal powder gasification high furnace of claim 1, it is characterized in that: heating zone adopts two step heating methods, low-temperature zone below 450 ℃ is with tube furnace or interchanger, 450 ℃-850 ℃ interval partial oxidation methods of using, obtaining reducing gas after first reducing gas heats through the partial oxidation method is H
2/ CO=0.15～6.
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| CN2007100931728A CN101463405B (en) | 2007-12-19 | 2007-12-19 | Production method for producing spongy iron by dry coal powder gasification high furnace |
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| CN2007100931728A CN101463405B (en) | 2007-12-19 | 2007-12-19 | Production method for producing spongy iron by dry coal powder gasification high furnace |
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| CN101463405A true CN101463405A (en) | 2009-06-24 |
| CN101463405B CN101463405B (en) | 2011-02-02 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101798610A (en) * | 2010-04-21 | 2010-08-11 | 姜文平 | Method and device using coal to directly reduce iron |
| LU91547B1 (en) * | 2009-04-03 | 2010-10-04 | Wurth Paul Sa | Method and installation for producing direct reduced iron |
| WO2016173248A1 (en) * | 2015-04-30 | 2016-11-03 | Beijing Shantie Technology Co., Ltd. | Flash ironmaking system and method |
| CN106753590A (en) * | 2016-12-02 | 2017-05-31 | 上海泽玛克敏达机械设备有限公司 | Rough coal gas processing system and method |
| CN109937247A (en) * | 2016-11-03 | 2019-06-25 | 米德雷克斯技术公司 | Utilize the direct-reduction of coal gasification and coke-stove gas |
-
2007
- 2007-12-19 CN CN2007100931728A patent/CN101463405B/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU91547B1 (en) * | 2009-04-03 | 2010-10-04 | Wurth Paul Sa | Method and installation for producing direct reduced iron |
| WO2010112612A1 (en) * | 2009-04-03 | 2010-10-07 | Paul Wurth S.A. | Method and installation for producing direct reduced iron |
| CN101798610A (en) * | 2010-04-21 | 2010-08-11 | 姜文平 | Method and device using coal to directly reduce iron |
| CN101798610B (en) * | 2010-04-21 | 2012-06-13 | 姜文平 | Method and device using coal to directly reduce iron |
| WO2016173248A1 (en) * | 2015-04-30 | 2016-11-03 | Beijing Shantie Technology Co., Ltd. | Flash ironmaking system and method |
| US10851430B2 (en) | 2015-04-30 | 2020-12-01 | Beijing Shantie Technology Co., Ltd. | Flash ironmaking system and method |
| CN109937247A (en) * | 2016-11-03 | 2019-06-25 | 米德雷克斯技术公司 | Utilize the direct-reduction of coal gasification and coke-stove gas |
| CN106753590A (en) * | 2016-12-02 | 2017-05-31 | 上海泽玛克敏达机械设备有限公司 | Rough coal gas processing system and method |
| CN106753590B (en) * | 2016-12-02 | 2022-08-12 | 上海泽玛克敏达机械设备有限公司 | Crude gas treatment system and method |
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|---|---|
| CN101463405B (en) | 2011-02-02 |
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