CN102605132A - Method for producing direct reduction iron by aid of coke oven gas - Google Patents
Method for producing direct reduction iron by aid of coke oven gas Download PDFInfo
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- CN102605132A CN102605132A CN201210064993XA CN201210064993A CN102605132A CN 102605132 A CN102605132 A CN 102605132A CN 201210064993X A CN201210064993X A CN 201210064993XA CN 201210064993 A CN201210064993 A CN 201210064993A CN 102605132 A CN102605132 A CN 102605132A
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- gas
- reduction
- oven gas
- shaft furnace
- coke
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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Abstract
The invention discloses a method for producing direct reduction iron by the aid of coke oven gas. The method is characterized in that reduction gas at the temperature ranging from 1050 DEG C to 1200 DEG C is led into a vertical furnace to realize reduction reaction, cold coke oven gas leads to the bottom of the vertical furnace, rises from a cooling section on the lower portion of the vertical furnace, and then is mixed with the reduction gas, after the temperature of mixture of the cold coke oven gas and the reduction gas is reduced to be 900-1000 DEG C, the coke oven gas and the reduction gas jointly enter a reduction section of the vertical furnace, and accordingly reduction of iron ore is completed. The coke oven gas is used as the reduction gas and further is used as cold gas, two strands of coke oven gas are mixed at the bottom of the reduction section of the vertical furnace and are jointly reacted, energy conservation and emission reduction are realized, and investment to a cooling system is lowered.
Description
Technical field
The present invention relates to a kind of method of reduced iron.
Background technology
Directly the reducing process work is to realize Iron and Steel Production short flow process, the i.e. important step of steel scrap/sponge iron (DRI)-electric furnace flow process.Be to accelerate STEEL INDUSTRY CONSTRUCTION ADJUSTMENT and industrial upgrading, change the Iron And Steel Industry development pattern, promote the important channel of saving, cleaning and Sustainable development.The direct reduction production that drops at present large-scale industrial application mainly contains 4 kinds of shaft furnace process, fluidization method, kiln process and retort processes making sponge iron; Wherein shaft furnace process is main production technique; 2007 in the world the dri of shaft furnace process production account for 77.6%, typical case representative is Midrex method and HYL/Energiron method.Shaft furnace is produced dri technology mostly to adopt natural gas is raw material in the world, after catalytic cracking, produces high temperature reduction gas, is used to carry out the reduction reaction of iron-bearing material.The Sweet natural gas shortage of China, development have independent intellectual property right, and the direct reducing process that utilizes enlarged shaft furnaces such as coke-oven gas, gas maked coal, coal-seam gas is the main flow direction of the direct reduction technique development of China.
The sponge iron temperature of coming out from the reduction shaft furnace section has 750 ℃～800 ℃, can cause that as not adding cooling intensive reoxidizes reaction.From public reported, existing shaft furnace is produced sponge iron technology, and what have is provided with the partial circulating cooling system, and cooling system generally is made up of cold gas washer, press, water trap and complex pipeline.Cold gas is extracted out outside the stove by cooling section top effuser, through sending into cooling section with fan again behind the cold gas cooling and purifying.The sponge iron cooling system that has is provided with sponge iron cooling storehouse, and hot sponge iron gets into the cooling storehouse, and cold gas feeds from bottom, cooling storehouse to be cooled off sponge iron, and the gas of extracting out from the cooling storehouse is sent into the cooling storehouse with fan after through udst separation, pressurization again.Cold gas all adopts nitrogen in above-mentioned process for cooling scheme, and the nitrogen temperature of extracting out from cooling section often wastes through physics heat behind the cooling and purifying up to more than 600 ℃, has increased the energy consumption of technology.And increase equipment such as dedusting, cooling, pressurization and make the investment cost of whole operational path improve greatly.
Summary of the invention
The purpose of this invention is to provide a kind of coke-oven gas that utilizes that need not independent cooling apparatus and produce the method for dri.
A kind of method of utilizing coke-oven gas to produce dri; It is characterized in that: temperature is carried out reduction reaction at 1050 ℃～1200 ℃ reducing gas feeding shaft furnace; The bottom of shaft furnace is connected with cold coke-oven gas; Cooling section rises and to mix the back temperature with reducing gas and drop to 900 ℃～1000 ℃ common entering reduction shaft furnace sections, completion reduction of iron ore cold coke-oven gas from the shaft furnace bottom.
Coke-oven gas is the reducing gas of shaft furnace iron-bearing material, coke-oven gas after a purification part through the water vapour humidification after, get into the coal gas heating unit, be heated to the reduction section that gets into shaft furnace after 1050 ℃～1200 ℃ of the temperature.Another part gets into shaft furnace cooling section bottom through the pressurization back; To temperature up to 750 ℃～cooling of 800 ℃ sponge iron; The coke-oven gas that cold gas rising entering shaft furnace advances into 1050 ℃～1200 ℃ of shaft furnace temperature with it mixes at reduction section, and temperature drops to 900 ℃～1000 ℃.In the coke-oven gas cooling sponge iron process carburization reaction takes place, 3Fe+CH
4=Fe
3C+2H
2, cementation zone is adhered on the sponge iron top layer, in air, is difficult for secondary oxidation, is suitable for storing and the use of follow-up Electric furnace steel making.After the iron-containing charge of shaft furnace added shaft furnace from the shaft furnace top, heat exchange and reduction were accomplished in the high temperature reduction coal gas countercurrent flow that in the process that it moves downward and from shaft furnace, gets into from the reduction section bottom.A part is used for the fuel gas as heating process after the dedusting of shaft furnace stock gas process, the heat exchange; Coke-oven gas with input after pressurization of part process and the decarburization is mixed into humidifier, heating back entering reduction shaft furnace; The residue stock gas is exported.
It is reducing gas that the present invention adopts coke-oven gas, uses coke-oven gas to be cooling gas simultaneously, and two strands of coke-oven gas mix the fellowship reaction in reduction shaft furnace section bottom, and energy-saving and emission-reduction have reduced the investment of independent cooling system.
Description of drawings
Fig. 1 is a schema of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is further specified.
It is as shown in Figure 1,
1) through purification, the coke-oven gas virgin gas of pressurization and follow-up after dedusting, cooling, pressurization, decarburization the shaft furnace top gas together; Get into the coal gas humidifier and carry out humidification, adopt 200 ℃ of LP steams that produce after the heat exchange of shaft furnace stock gas during the coal gas humidification is arranged.
2) through the coal gas behind the humidification, get into gas heating system, temperature rises to 1050 ℃～1200 ℃, and the fuel gas of heating adopts shaft furnace furnace roof dedusting rear section coal gas.
3) the normal temperature coke-oven gas feeds from shaft furnace cooling section bottom; Sponge iron is cooled to 50 ℃; Coke-oven gas obtains heating, and the coke-oven gas of rising gets into reduction section from the shaft furnace cooling section, mixes with the coke-oven gas of direct feeding reduction section; Temperature drops to about 900 ℃～1000 ℃, carries out the reduction of iron-bearing material.
4) in the shaft furnace iron-bearing material when being reduced into sponge iron, the portion C H in the coal gas
4With H
2O, CO
2And upgrading reaction and carburization reaction take place to transform, production CO+H in Fe
2Reducing gas with replenish loss.
5) the reacted top gas of shaft furnace after heat is selected the thick dedusting of wind fly-ash separator, gets into hot tube heat exchanger and reclaims coal gas heat energy, the by-product LP steam, simultaneously gas temperature is reduced to 150 ℃ after, get into follow-up dedusting cooling system and carry out the dedusting cooling.Follow-up dedusting cooling can be adopted the dust separating mode of wet scrubbing, also can adopt the form of bag-type dust+chilling spray, and the LP steam of interchanger by-product just is used for mixed gas humidification operation after the throttling valve decompression.
6) purified gas after the dedusting cooling, a part of coal gas output behind the pressurization of residual gas process, the empty pressure swing adsorption decarbonization, with the coke-oven gas virgin gas that replenishes, gets into postorder coal gas humidification operation.
Claims (3)
1. method of utilizing coke-oven gas to produce dri; It is characterized in that: temperature is carried out reduction reaction at 1050 ℃～1200 ℃ reducing gas feeding shaft furnace; The bottom of shaft furnace is connected with cold coke-oven gas; Cooling section rises and to mix the back temperature with reducing gas and drop to 900 ℃～1000 ℃ common entering reduction shaft furnace sections, completion reduction of iron ore cold coke-oven gas from the shaft furnace bottom.
2. the method for utilizing coke-oven gas to produce dri as claimed in claim 1, it is characterized in that: described coke-oven gas is Sweet natural gas, gas maked coal or coal-seam gas.
3. the method for utilizing coke-oven gas to produce dri as claimed in claim 2; It is characterized in that: the top gas of shaft furnace is after heat exchange, dedusting; Part output; A part is as the fuel gas of follow-up heating process, and the formation reducing gas is mixed in the dedusting of a part of process, cooling back with the coke-oven gas that replenishes, and gets into shaft furnace behind process heating and the humidification again and reacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210064993XA CN102605132A (en) | 2012-01-13 | 2012-01-13 | Method for producing direct reduction iron by aid of coke oven gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210064993XA CN102605132A (en) | 2012-01-13 | 2012-01-13 | Method for producing direct reduction iron by aid of coke oven gas |
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| CN102605132A true CN102605132A (en) | 2012-07-25 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103409629A (en) * | 2013-07-10 | 2013-11-27 | 中国恩菲工程技术有限公司 | Laterite gas base reduction method |
| CN103409630A (en) * | 2013-07-10 | 2013-11-27 | 中国恩菲工程技术有限公司 | Laterite gas gas reduction apparatus |
| CN108822898A (en) * | 2018-06-11 | 2018-11-16 | 安徽工业大学 | A kind of the improving quality of coal gas recyclable device and technique of the full coal ironmaking technology of total oxygen |
| 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 |
| CN114672602A (en) * | 2022-04-15 | 2022-06-28 | 黑龙江建龙钢铁有限公司 | Method for smelting schreyerite by coke oven gas-based shaft furnace and carrying out electric furnace melting, separating and deep reduction |
| CN115449580A (en) * | 2022-08-31 | 2022-12-09 | 河北张宣高科科技有限公司 | Zero-carbon-emission direct reduction system and process completely adopting coke oven gas |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1772929A (en) * | 2005-09-15 | 2006-05-17 | 中冶东方工程技术有限公司 | Method and apparatus for producing directly reduced iron with coke oven gas |
| CN1995402A (en) * | 2006-01-06 | 2007-07-11 | 伊尔技术有限公司 | Method for directly reducing iron oxide to metallic iron by using coke oven gas and the like |
| CN102268504A (en) * | 2011-08-19 | 2011-12-07 | 中冶赛迪工程技术股份有限公司 | Direct reduction process for producing sponge iron by using coke oven gas |
| CN102304599A (en) * | 2011-09-22 | 2012-01-04 | 中冶赛迪上海工程技术有限公司 | Method and device for producing direct reduced iron by using gas-based reduction shaft furnace |
-
2012
- 2012-01-13 CN CN201210064993XA patent/CN102605132A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1772929A (en) * | 2005-09-15 | 2006-05-17 | 中冶东方工程技术有限公司 | Method and apparatus for producing directly reduced iron with coke oven gas |
| CN1995402A (en) * | 2006-01-06 | 2007-07-11 | 伊尔技术有限公司 | Method for directly reducing iron oxide to metallic iron by using coke oven gas and the like |
| CN102268504A (en) * | 2011-08-19 | 2011-12-07 | 中冶赛迪工程技术股份有限公司 | Direct reduction process for producing sponge iron by using coke oven gas |
| CN102304599A (en) * | 2011-09-22 | 2012-01-04 | 中冶赛迪上海工程技术有限公司 | Method and device for producing direct reduced iron by using gas-based reduction shaft furnace |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103409629A (en) * | 2013-07-10 | 2013-11-27 | 中国恩菲工程技术有限公司 | Laterite gas base reduction method |
| CN103409630A (en) * | 2013-07-10 | 2013-11-27 | 中国恩菲工程技术有限公司 | Laterite gas gas reduction apparatus |
| 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 |
| CN108822898A (en) * | 2018-06-11 | 2018-11-16 | 安徽工业大学 | A kind of the improving quality of coal gas recyclable device and technique of the full coal ironmaking technology of total oxygen |
| CN114672602A (en) * | 2022-04-15 | 2022-06-28 | 黑龙江建龙钢铁有限公司 | Method for smelting schreyerite by coke oven gas-based shaft furnace and carrying out electric furnace melting, separating and deep reduction |
| CN115449580A (en) * | 2022-08-31 | 2022-12-09 | 河北张宣高科科技有限公司 | Zero-carbon-emission direct reduction system and process completely adopting coke oven gas |
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Application publication date: 20120725 |