CN102586530A - Method for producing sponge iron by using coke-oven gas - Google Patents
Method for producing sponge iron by using coke-oven gas Download PDFInfo
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- CN102586530A CN102586530A CN2012100005877A CN201210000587A CN102586530A CN 102586530 A CN102586530 A CN 102586530A CN 2012100005877 A CN2012100005877 A CN 2012100005877A CN 201210000587 A CN201210000587 A CN 201210000587A CN 102586530 A CN102586530 A CN 102586530A
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- coke
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- oven gas
- sponge iron
- oven
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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 belongs to a method for producing sponge iron by using a coke-oven gas. The method comprises the following steps of: preheating the purified coke-oven gas; incompletely burning the preheated coke-oven gas and fed oxygen at an inlet of a fluidized bed, and rising the temperature of a reducing gas containing CO+H2 to be 900-1000 DEG C; and carrying out convection current reduction on the reducing gas and iron concentrate or powered mine in the fluidized bed to generate the sponge iron. The method changes the traditional utilization manner with relatively low economic benefits that a coal gas is used for generating electricity, is even discharged and the like; and the using value of the coke-oven gas is increased by using the coke-oven gas as the reducing gas for producing the sponge iron. The method has the advantages that the operation is simple, the production is flexible, the utilization rate of energy resources is high, the emission of pollutants and the energy consumption are reduced, and good economic benefits and social benefits can be brought about.
Description
Technical field
The invention belongs to the ironmaking field, be specifically related to a kind of method of utilizing coke-oven gas to produce sponge iron.
Background technology
The environmental requirement of steel industry increasingly stringent and severe Market Situation require iron and steel enterprise must accomplish energy-saving and emission-reduction, reduce cost.In Steel Production Flow Chart, blast furnace ironmaking operation discharge amount of pollution occupies the major part of whole process flow quantity discharged, and wherein, technologies such as sintering, pelletizing occupy the major part of ironmaking process energy consumption and disposal of pollutants again.China's iron ore grade is generally lower; The a large amount of fine iron breeze that needs to produce could supply blast furnace to use behind sintering; When having increased environmental pollution and energy consumption; Also increased production cost,, saved energy and reduce the cost, reduced cost significant steel industry if can directly adopt lower iron ore concentrate of price or fine ore to replace agglomerate, pellet.
At present, China is annual when producing a large amount of coke, produces the coke-oven gas of hundreds of billion cubic meter.Yet, except a part by the enterprise production utilization, remaining coke-oven gas is how as fuel or generating, but nonetheless, still has a large amount of coke-oven gas to be diffused, and not only causes great environmental pollution, a kind of especially wasting of resources.In the coke-oven gas; Staple is hydrogen and methane, and calculating shows, produces sponge iron than having better economic benefit as purposes such as generatings with coke-oven gas as reducing gas; Even than in the present direct reduction unit, better with natural gas pyrolysis as reduction source of the gas effect.
Therefore, develop a kind of rational and effective coke-oven gas reduction fine ore and produce sponge iron technology, not only can reduce pollutant emission; Improve the comprehensive utilization of resources level; And can reduce the enterprise production cost, and strengthen enterprise competitiveness, have tangible economic benefit and social benefit.
Summary of the invention
Problem to be solved by this invention is the deficiency that exists to prior art, propose a kind of coke-oven gas that utilizes and produce sponge iron, and the efficient coke-oven gas that utilizes that utilizes of realization resource comprehensive is produced the method for sponge iron.
Realize that the technical scheme that above-mentioned purpose adopted is:
A kind of method of utilizing coke-oven gas to produce sponge iron, its step:
1) coke-oven gas after will purifying carries out preheating, and preheating temperature is 850 ℃～950 ℃;
2) coke-oven gas after the preheating carries out incomplete combustion at the oxygen of fluidized-bed ingress and feeding, and the methane cracking in the coke-oven gas is become CO and H
2, and make and contain CO+H
2Volume percent be elevated to 900 ℃～1000 ℃ in the temperature of 90% reducing gas at least;
3) reducing gas is carried out the convection current reduction with smart powder of iron or fine ore in fluidized-bed, generates sponge iron.
It is characterized in that: the tail gas of discharging from fluidized-bed through be cooled to≤200 ℃, and through purifying and remove CO
2After, mix as reducing gas with arbitrary proportion with coke-oven gas after purifying.
The invention has the beneficial effects as follows: changed coke-oven gas as generating in addition diffuse etc. economic benefit low relatively utilize mode, through coke-oven gas is used as the reducing gas of producing sponge iron, improved its economic use value.Adopt fluidized-bed process, can combine the many present situations of Chinese lean ore, directly use homemade fine iron breeze, not only alleviated environmental pollution and energy consumption that sintering produces, and reduced the enterprise production cost, improve domestic iron ore level of comprehensive utilization.Can know that to sum up the each several part that the present invention adopted is existing mature technology, simple to operate, economic and reliable is produced flexibly, and energy utilization rate is high, has reduced the discharging and the energy expenditure of pollutent, can bring good economic benefit and social benefit.
Embodiment
For understanding the present invention better, below in conjunction with embodiment the present invention is further described, but is not construed as limiting the invention.
Embodiment 1
A kind of method of utilizing coke-oven gas to produce sponge iron, its step:
1) coke-oven gas after will purifying carries out preheating, and preheating temperature is 850 ℃～860 ℃;
2) coke-oven gas after the preheating carries out incomplete combustion with the oxygen that feeds before the fluidized-bed inlet, makes the methane cracking in the coke-oven gas become CO and H
2, and make and contain CO+H
2Volume percent be elevated to 900 ℃～910 ℃ in the temperature of 90% reducing gas;
3) reducing gas is carried out the convection current reduction with the smart powder of the iron that adds fluidized-bed in fluidized-bed, generates sponge iron.
Embodiment 2
A kind of method of utilizing coke-oven gas to produce sponge iron, its step:
1) through the coke-oven gas that purification with come out from fluidized-bed through being cooled to 50 ℃, and purify and remove CO
2After tail gas mix, in its gas mixture, coke-oven gas is 7: 3 with the gas volume ratio of tail gas; And with charge heating to 880 ℃～890 ℃;
2) gas mixture after the preheating carries out incomplete combustion at the oxygen of fluidized-bed ingress and feeding, and the methane cracking in the gas mixture is become CO and H
2, and make and contain CO+H
2Volume percent be elevated to 920 ℃～930 ℃ in the temperature of 92.5% reducing gas;
3) reducing gas is carried out convection current with fine ore in fluidized-bed, and reduction generates sponge iron.
Embodiment 3
A kind of method of utilizing coke-oven gas to produce sponge iron, its step:
1) through the coke-oven gas that purification with come out from fluidized-bed through being cooled to 80 ℃, and purify and remove CO
2After tail gas mix, in its gas mixture, coke-oven gas is 9: 1 with the gas volume ratio of tail gas; And with 910 ℃～920 ℃ of charge heatings;
2) gas mixture after the preheating carries out incomplete combustion at the oxygen of fluidized-bed ingress and feeding, and the methane cracking in the gas mixture is become CO and H
2, and make and contain CO+H
2Volume percent be elevated to 965 ℃～975 ℃ in the temperature of 95% reducing gas;
3) reducing gas is carried out convection current with fine ore in fluidized-bed, and reduction generates sponge iron.
Among above-mentioned each embodiment, the CO that removes
2Can be used as other industrial application, the recyclable utilization of the waste heat of tail gas, tail gas also can be used as output coal gas to be used.Above disclosedly being merely preferred embodiment of the present invention, is not in order to limit scope of the present invention.Equivalence according to the present invention did changes, and still belongs to protection scope of the present invention.
Claims (2)
1. method of utilizing coke-oven gas to produce sponge iron, its step:
1) coke-oven gas after will purifying carries out preheating, and preheating temperature is 850 ℃～950 ℃;
2) coke-oven gas after the preheating carries out incomplete combustion at the oxygen of fluidized-bed ingress and feeding, and the methane cracking in the coke-oven gas is become CO and H
2, and make and contain CO+H
2Volume percent be elevated to 900 ℃～1000 ℃ in the temperature of 90% reducing gas at least;
3) reducing gas is carried out the convection current reduction with smart powder of iron or fine ore in fluidized-bed, generates sponge iron.
2. a kind of method of utilizing coke-oven gas to produce sponge iron as claimed in claim 1 is characterized in that: the tail gas of discharging from fluidized-bed through be cooled to≤200 ℃, and through purifying and remove CO
2After, mix as reducing gas with arbitrary proportion with coke-oven gas after purifying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100005877A CN102586530A (en) | 2012-01-04 | 2012-01-04 | Method for producing sponge iron by using coke-oven gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100005877A CN102586530A (en) | 2012-01-04 | 2012-01-04 | Method for producing sponge iron by using coke-oven gas |
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| CN102586530A true CN102586530A (en) | 2012-07-18 |
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| CN2012100005877A Pending CN102586530A (en) | 2012-01-04 | 2012-01-04 | Method for producing sponge iron by using coke-oven gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103525965A (en) * | 2013-10-08 | 2014-01-22 | 中国石油大学(北京) | Method for producing gas-based directly reduced iron by utilizing non-catalytic conversion of coke-oven gas, and system thereof |
| CN115232904A (en) * | 2021-04-23 | 2022-10-25 | 中国石油大学(北京) | Method for producing sponge iron |
| CN115652009A (en) * | 2022-09-26 | 2023-01-31 | 中国恩菲工程技术有限公司 | System and method for preparing sponge iron |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215614A (en) * | 2007-01-06 | 2008-07-09 | 邹明 | Reducing chamber and heating chamber multilayer obturation alternation and fusion gasification combination metal smelting method |
| CN101528948A (en) * | 2006-10-13 | 2009-09-09 | 西门子Vai金属科技有限责任公司 | Method and device for producing molten material |
| CN102206723A (en) * | 2011-01-13 | 2011-10-05 | 北京首钢国际工程技术有限公司 | Air-base direct reduction iron-making method for reducing iron concentrate powder by self-reforming of gas rich in methane |
-
2012
- 2012-01-04 CN CN2012100005877A patent/CN102586530A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101528948A (en) * | 2006-10-13 | 2009-09-09 | 西门子Vai金属科技有限责任公司 | Method and device for producing molten material |
| CN101215614A (en) * | 2007-01-06 | 2008-07-09 | 邹明 | Reducing chamber and heating chamber multilayer obturation alternation and fusion gasification combination metal smelting method |
| CN102206723A (en) * | 2011-01-13 | 2011-10-05 | 北京首钢国际工程技术有限公司 | Air-base direct reduction iron-making method for reducing iron concentrate powder by self-reforming of gas rich in methane |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103525965A (en) * | 2013-10-08 | 2014-01-22 | 中国石油大学(北京) | Method for producing gas-based directly reduced iron by utilizing non-catalytic conversion of coke-oven gas, and system thereof |
| CN115232904A (en) * | 2021-04-23 | 2022-10-25 | 中国石油大学(北京) | Method for producing sponge iron |
| CN115232904B (en) * | 2021-04-23 | 2023-11-24 | 中国石油大学(北京) | Method for producing sponge iron |
| CN115652009A (en) * | 2022-09-26 | 2023-01-31 | 中国恩菲工程技术有限公司 | System and method for preparing sponge iron |
| CN115652009B (en) * | 2022-09-26 | 2024-05-24 | 中国恩菲工程技术有限公司 | System and method for preparing sponge iron |
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Application publication date: 20120718 |