CN101759149A - Method for producing reducing gas for shaft furnace in steel plant - Google Patents
Method for producing reducing gas for shaft furnace in steel plant Download PDFInfo
- Publication number
- CN101759149A CN101759149A CN200810234484A CN200810234484A CN101759149A CN 101759149 A CN101759149 A CN 101759149A CN 200810234484 A CN200810234484 A CN 200810234484A CN 200810234484 A CN200810234484 A CN 200810234484A CN 101759149 A CN101759149 A CN 101759149A
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- CN
- China
- Prior art keywords
- gas
- removal device
- shaft furnace
- adopts
- changing device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Landscapes
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a method for producing reducing gas for a shaft furnace in a steel plant, belonging to the field of the steel making technology. More than 80 percent of CO in the byproduct gas is converted into CO2 and H2 by a CO conversion device; the CO2 and the H2O in the byproduct gas are removed by a CO2 removal device and a H2O removal device; the byproduct gas is heated to the specified temperature by a tubular heating furnace; the heat of the waste gas of the tubular heating furnace is recovered by a waste heat boiler; the generated steam is used by the CO conversion device; and the tail gas of the shaft furnace is processed and returned to the CO2 removal device and the H2O removal device. The CO2 removal device adopts the NHD method, the H2O removal device adopts the pressure swing adsorption (PSA) method, and the adsorbent used by the H2O removal device is silica gel. The invention has the advantages of causing less effective gas loss in the CO2 removing process and avoiding the carbonization in the heating process.
Description
Technical field: the invention belongs to steelmaking technical field, be specifically related to a kind of method of reducing gas for shaft furnace in steel plant.
Background technology melting and reducing technology is the great frontier science and technology in the international Iron And Steel Industry technology, and its target is to realize that mill coal ironmaking replaces traditional blast furnace ironmaking.An importance that influences its economy is the reasonable utilization of its by-product gas.Fused reduction iron-smelting is produced molten iron per ton and is produced 1500-1800Nm
3Coal gas (reduction tail gas).The purposes of this by-product gas has: make combustion gas, generating, industrial chemicals and production sponge iron, for steel mill, utilizing this tail gas to produce sponge iron is a kind of rational selection.The requirement of producing the reducing gas that sponge iron adopts according to shaft furnace is very high, and there is following shortcoming in existing processes: (1) adopts the VPSA method to remove CO
2, H
2, the CO loss is big.(2) in the heat-processed, scission reaction takes place and tie carbon easily on exchanger tube wall in the CO in the gas, influences the heat exchange effect.The heating of (3) second steps needs to use oxygen, oxygen combustion H
2The CO that intensification produces with CO
2Increase with water, reduced the reducing property of gas.
Summary of the invention: the above-mentioned shortcoming at common process exists the present invention proposes following New Process for Treatment.By-product gas is behind the CO changing device, and the CO changing device adopts the co-mo antisulphuric transforming catalyst of Qilu Petrochemical research institute research and development, and the CO more than 80% in the coal gas is changed into CO
2And H
2, remove CO in the gas by the decarburization dewatering unit
2And H
2O enters tubular oven and is heated to specified temperature.Tubular oven waste gas reclaims heat by waste heat boiler, and the steam of generation uses for the CO changing device, and shaft furnace tail gas returns the decarburization dewatering unit after treatment.An important feature of the present invention is to adopt the CO conversion process that the concentration of CO in the coal gas is reduced to 0.5%-1%, and done two benefits like this: the loss of (1) decarburization available gas is little; (2) avoided the knot carbon problem in the heat-processed.Another important feature of the present invention is to adopt tubular oven to heat up, and has cancelled oxygenation burning temperature control furnace, therefore CO in the gas after the present invention handles
2, H
2O content is low, and reducing property is good.The decarbonization device that the present invention adopts is the NHD method.The present invention adopts takes off H
2The O device is transformation absorption (PSA), and the employed sorbent material of dewatering unit is a silica gel.
Embodiment: the present invention is described in detail below in conjunction with embodiment.
Embodiment 1
The coal gas amount is 23000Km
3/ h, temperature is a normal temperature, 0.5Mpa (table), coal gas change into CO with the CO more than 80% in the coal gas behind the CO changing device
2And H
2, remove CO in the gas by VPSA decarburization dewatering unit 2
2And H
2O enters tubular oven and is heated to more than 800 ℃.After above-mentioned art breading, CO content＞95% in the reducing gas, CO
2Content＜3%, temperature are more than 800 ℃, and this reducing gas meets the service requirements of shaft furnace.
Claims (4)
1. the preparation method of reducing gas for shaft furnace in steel plant is characterized in that by-product gas behind the CO changing device, and the CO more than 80% in the coal gas is changed into CO
2And H
2, remove CO in the gas by the decarburization dewatering unit
2And H
2O enters tubular oven and is heated to specified temperature.Tubular oven waste gas reclaims heat by waste heat boiler, and the steam of generation uses for the CO changing device, and shaft furnace tail gas returns the decarburization dewatering unit after treatment.
2. method according to claim 1 is characterized in that the CO changing device adopts the co-mo antisulphuric transforming catalyst of Qilu Petrochemical research institute research and development,
3. method according to claim 1 is characterized in that decarbonization device adopts the NHD method.
4. according to claim 1 or 3 described methods, it is characterized in that the H that takes off that adopts
2The O method is transformation absorption, and the employed sorbent material of dewatering unit is a silica gel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810234484A CN101759149A (en) | 2008-11-19 | 2008-11-19 | Method for producing reducing gas for shaft furnace in steel plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810234484A CN101759149A (en) | 2008-11-19 | 2008-11-19 | Method for producing reducing gas for shaft furnace in steel plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101759149A true CN101759149A (en) | 2010-06-30 |
Family
ID=42490558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810234484A Pending CN101759149A (en) | 2008-11-19 | 2008-11-19 | Method for producing reducing gas for shaft furnace in steel plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101759149A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109971906A (en) * | 2019-04-11 | 2019-07-05 | 中冶赛迪技术研究中心有限公司 | A kind of restoring method of ultralow carbon emission production sponge iron |
-
2008
- 2008-11-19 CN CN200810234484A patent/CN101759149A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109971906A (en) * | 2019-04-11 | 2019-07-05 | 中冶赛迪技术研究中心有限公司 | A kind of restoring method of ultralow carbon emission production sponge iron |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Tao Weiping Document name: Notification of Publication of the Application for Invention |
|
| DD01 | Delivery of document by public notice |
Addressee: Tao Weiping Document name: Notification of before Expiration of Request of Examination as to Substance |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100630 |