CN104342550A - Coke oven coal gas assisted sintering method - Google Patents
Coke oven coal gas assisted sintering method Download PDFInfo
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- CN104342550A CN104342550A CN201310318214.9A CN201310318214A CN104342550A CN 104342550 A CN104342550 A CN 104342550A CN 201310318214 A CN201310318214 A CN 201310318214A CN 104342550 A CN104342550 A CN 104342550A
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- coke
- oven gas
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention provides a coke oven coal gas assisted sintering method, which comprises: during a sintering process, spraying coke oven coal gas above the sintered material surface according to the consumption amount of 0.5-3.0 Nm<3> coke oven coal gas per ton of sintered ore, and concurrently reducing the proportion of carbon of the sintered material by 6-25%. According to the present invention, the coke plant by-product coke oven coal gas with the characteristics of easy obtaining in the iron and steel enterprises and low price is mainly adopted as the assisted fuel during the sintered ore sintering process while the use proportion of the coke powder is reduced so as to improve the sintering atmosphere and ensure the quality of the sintered ore. In the prior art, the reduction of the solid fuel burn-up and the sintered ore quality can not concurrently achieved. With the method of the present invention, the technical problem in the prior art is effectively solved.
Description
technical field:
The present invention relates to a kind of method of coke-oven gas assisted sintering, belong to technical field of ferrous metallurgy.
background technology:
In order to reduce blast furnace ironmaking coke ratio and smelting cost, blast furnace is to the requirement of agglomerate high strength and high reductibility often.In sintering circuit, general requirement agglomerate has higher intensity, high rate of finished products, the lower rate of return mine, and lower fuel consumption.The agglomerate of high strength and high reductibility consumes less coke in blast furnace ironmaking process, thus reduces the discharge of carbonic acid gas.In the long run consider, carbon dioxide discharge-reduction requirement will become one of bottleneck of restriction development of iron & steel industry.According to related data introduction, sintering and blast furnace operation CO2 emissions account for 60% of industrial discharge total amount.Therefore, no matter consider from Reducing Cost in Enterprises or consider from environment protection angle, the fuel ratio reducing sintering solid fuel this consumption ratio and reduction blast furnace burden becomes the urgent need of ironmaking technology.
How to ensure that agglomerate has certain intensity and yield rate, and solid fuel consumption ratio is lower becomes one of Main Topics of agglomerant author.
In order to obtain the agglomerate with some strength, more common way improves sinter basicity.Although improve barrate strength and yield rate that basicity can strengthen agglomerate to a certain extent, but Iron grade will be caused after raising basicity to decline further, as everyone knows, blast furnace feeding agglomerate Iron grade declines 1%, fuel ratio raises 1.5%, production declining 2.5%, ton scum amount increases 30kg/t, and blast furnace coal is than decline 15kg/t.Meanwhile, use the agglomerate of high alkalinity, blast furnace must add the neutralization of more silica to meet deslagging needs simultaneously, thus further increases out the quantity of slag, adds ironmaking cost.
In sintering process, have certain liquid phase as Binder Phase to meet iron ore sintering, the solid fuel consumption ratio in raw material is often higher, generally between 4.5% to 5.0%.
Under the prerequisite improving sinter quality, reduce solid fuel consumption become one of difficult problem that SINTERING PRODUCTION mainly faces.Solve the active demand that this technical barrier becomes SINTERING PRODUCTION.
summary of the invention:
The object of the invention is a kind of method that coke-oven gas assisted sintering is provided for above-mentioned Problems existing, improve sinter quality, the method of agglomerate solid fuel consumption can also be reduced simultaneously, solve the technical barrier that cannot reduce solid fuel consumption under improving the prerequisite of sinter quality in sintering production process.
Above-mentioned object is realized by following technical scheme:
The method of coke-oven gas assisted sintering, the method comprises: at the consumption of the process sintered according to agglomerate 0.5-3.0Nm3 coke-oven gas per ton, and at sintering charge level uppermost spray coke-oven gas, the mixed carbon comtent of sintered material reduces 6 ~ 25% simultaneously.
The method of described coke-oven gas assisted sintering, the time that described sprinkling coke-oven gas carries out starts to spray coke-oven gas after igniting terminates 1min, and spraying time is 5-40min or sprays the 10-80% that length is sinter machine length.
Beneficial effect:
1. the present invention in sintering process according to the size of Sintering Yield, according to the consumption of agglomerate 0.5-3.0Nm3 coke-oven gas per ton, coke-oven gas is sprayed into sintering charge level, under the effect of negative pressure, coke-oven gas is inhaled into the reaction of sintering combustion layer top, to reach the effect of uniform heat, can improve sinter quality, the solid fuel of agglomerate can reduce by 6%-30% with addition of ratio simultaneously.Coke-oven gas is utilized as the sinter production method of the auxiliary fuel of sintering process to be, in sintering process, sinter machine is introduced the auxiliary fuel of a small amount of coke-oven gas as sintering process, meanwhile, sintering process solid fuel proportioning and sintering plant revamp can be reduced.The method of described coke-oven gas assisted sintering, the time that described sprinkling coke-oven gas carries out starts to spray coke-oven gas after igniting terminates 1min, and spraying time is 5-40min or sprays the 10-80% that length is sinter machine length.
2. the key of the technology of the present invention is, using the assist gas of iron and steel enterprise's coke-oven gas as sintering process, to spray into a small amount of coke-oven gas in sintering process, while improving sinter quality, can reduce sintering process solid fuel proportioning.In raw material sintering process, coke-oven gas sprays into from sintering charge level, because sintered material mask has certain negative pressure, thus this part coke-oven gas is drawn into the zone of combustion top of agglomerate and induces reaction, and improves the residence time of agglomerate high-temperature zone more than 1000 DEG C, simultaneously, due to solid-fuelled minimizing, the temperature reducing sinter bed bottom makes sintering process temperature more even, and balance the distribution of heat at sintering Different layer of the compost, entirety improves sinter quality.Meanwhile, the minimizing of solid fuel proportioning, adds the oxidizing atmosphere in sintering process, and causing pasting sour calcium growing amount increases, and sinter quality improves.The cardinal principle of Here it is coke-oven gas assisted sintering technology.
3. the present invention is according to sinter machine size, according to the consumption of agglomerate 0.5-3.0Nm3 coke-oven gas per ton, coke-oven gas is sprayed into sintering charge level, under the effect of sintering negative pressure, coke-oven gas is drawn into sinter bed, and cause combustion reactions on bed of material top, improve the residence time of agglomerate high-temperature zone more than 1000 DEG C, simultaneously, due to solid-fuelled minimizing, the temperature reducing sinter bed bottom makes sintering process temperature more even, and balance the distribution of heat at sintering Different layer of the compost, entirety improves sinter quality.Apply this technology, solid fuel proportioning reduces, and adds the oxidizing atmosphere in sintering process, and causing pasting sour calcium growing amount increases, and sinter quality improves.
4. in iron and steel enterprise, coke-oven gas easily obtains, and draws materials conveniently.
5. the present invention reduces unit agglomerate fuel consumption, reduces the Iron-smelting energy consumption of iron and steel enterprise, correspondingly reduces the discharge of iron and steel enterprise's carbonic acid gas, is conducive to the improvement of environment.
embodiment:
Coke-oven gas assisted sintering technology is mainly in sintering process, according to the size of sinter machine output, according to the consumption of agglomerate 0.5-3.0Nm3 coke-oven gas per ton, spray into coke-oven gas to sintering charge level, to balance combustion heat distribution in sinter bed, totally improve the technology of sinter quality.Will accomplish in coke-oven gas assisted sintering technology implementation process, evenly spray along sinter machine width, length direction is reasonable.Meanwhile, when adopting coke-oven gas assisted sintering technology, solid fuel proportioning should reduce relatively.Be unfavorable for the generation of compound calcium ferrite in order to avoid sintering temperature is too high, solid fuel should reduce solid fuel with addition of ratio 6%-30% according to sinter quality situation with addition of ratio on original basis.Produce according to the method described above, the object improving sinter quality or the decline of agglomerate solid fuel consumption can be reached.
Embodiment 1:
Plum steel sintered cup laboratory example.Before and after test, sintering basicity, ratio of components, operating parameters etc. all do not do any change.Before spraying coke-oven gas, barrate strength is 69.20%, yield rate 76.22%.In order to reduce agglomerate solid burnup and improve sinter quality further, according to the size of sintered cup area and output, spraying the coke-oven gas of 0.093Nm3 to sintered cup charge level, solid fuel proportioning being dropped to 4.1% from 4.5% simultaneously.Adopt coke-oven gas assisted sintering technology, in sintering process, spray coke-oven gas certain hour.Carry out after terminating arranging, index of correlation measures.Test-results finds, after spraying coke-oven gas, Sinter Tumber Index is increased to 72.53% from original 69.2%, and yield rate brings up to 81.61% from original 76.22%, and agglomerate solid fuel consumption is reduced to 46.61kg/t from original 54.81kg/t.The agglomerate sprayed before and after coke-oven gas is detected contrast mutually through ore deposit, found that in agglomerate, the good compound calcium ferrite of metallurgical performance is highly improved, 35.26% is brought up to from original 31.31%, meanwhile the metallurgical performance of agglomerate also improves, and reduction degree also brings up to 82.4% from original 79.3%.
After application the technology of the present invention, spray coke-oven gas and cause the changing conditions of sinter quality specifically in table 1:
Table 1 embodiment 1 is high low basicity sinter quality change situation (%) after applying the present invention
| Numbering | Iron grade | TI intensity | Yield rate | Calcium ferrite content | Fuel consumption | Reduction degree RI |
| Do not spray the agglomerate of coke-oven gas | 57.4 | 69.20 | 76.22 | 31.31 | 54.81kg/t | 79.3 |
| Spray coke-oven gas agglomerate | 57.4 | 72.53 | 81.61 | 35.26 | 46.61kg/t | 82.4 |
Embodiment 2:
Plum steel sintered cup laboratory example.Before and after test, sintering basicity, ratio of components, operating parameters etc. all do not do any change.Before spraying coke-oven gas, barrate strength is 69.20%, yield rate 76.22%.In order to reduce agglomerate solid burnup and improve sinter quality further, according to the size of sintered cup area and output, spraying the coke-oven gas of 1.56Nm3 to sintered cup charge level, solid fuel proportioning being dropped to 4.0% from 4.5% simultaneously.Adopt coke-oven gas assisted sintering technology, in sintering process, spray coke-oven gas certain hour.Carry out after terminating arranging, index of correlation measures.Test-results finds, after spraying coke-oven gas, Sinter Tumber Index is increased to 72.53% from original 69.2%, and yield rate brings up to 81.61% from original 76.22%, and solid fuel consumption is reduced to 48.02kg/t from original 54.81kg/t.The agglomerate sprayed before and after coke-oven gas is detected contrast mutually through ore deposit, found that in agglomerate, the good compound calcium ferrite of metallurgical performance is highly improved, 35.26% is brought up to from original 31.31%, meanwhile the metallurgical performance of agglomerate also improves, and reduction degree also brings up to 82.4% from original 79.3%.
After application the technology of the present invention, spray coke-oven gas and cause the changing conditions of sinter quality specifically in table 2:
Table 2 embodiment 2 is high low basicity sinter quality change situation (%) after applying the present invention
| Numbering | Iron grade | TI intensity | Yield rate | Calcium ferrite content | Fuel consumption | Reduction degree RI |
| Do not spray the agglomerate of coke-oven gas | 57.4 | 69.20 | 76.22 | 31.31 | 54.81kg/t | 79.3 |
| Spray coke-oven gas agglomerate | 57.4 | 72.53 | 81.61 | 35.26 | 48.02kg/t | 82.4 |
Below be only most preferred embodiment of the present invention, method of the present invention includes but not limited to the technical scheme disclosed in above-described embodiment, and unaccomplished matter of the present invention belongs to the common practise of those skilled in the art.
Claims (2)
1. the method for a coke-oven gas assisted sintering, it is characterized in that: the method comprises: at the consumption of the process sintered according to agglomerate 0.5-3.0Nm3 coke-oven gas per ton, at sintering charge level uppermost spray coke-oven gas, the mixed carbon comtent of sintered material reduces 6 ~ 25% simultaneously.
2. the method for coke-oven gas assisted sintering according to claim 1, it is characterized in that: the time that described sprinkling coke-oven gas carries out starts to spray coke-oven gas after igniting terminates 1min, spraying time is 5-40min or sprays the 10-80% that length is sinter machine length.
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| CN201310318214.9A CN104342550A (en) | 2013-07-26 | 2013-07-26 | Coke oven coal gas assisted sintering method |
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| CN201310318214.9A CN104342550A (en) | 2013-07-26 | 2013-07-26 | Coke oven coal gas assisted sintering method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106191425A (en) * | 2016-07-25 | 2016-12-07 | 马鞍山钢铁股份有限公司 | A kind of sintering sprays the method adding imflammable gas |
| CN111425884A (en) * | 2018-12-24 | 2020-07-17 | 上海梅山钢铁股份有限公司 | Method for reducing emission concentration of sulfur dioxide in flue gas of full-combustion gas boiler |
| CN112325653A (en) * | 2020-09-28 | 2021-02-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Repairing method of metal mixer lining |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5518585A (en) * | 1978-07-27 | 1980-02-08 | Sumitomo Metal Ind Ltd | Manufacture of sintered ore |
| CN101300366A (en) * | 2005-10-31 | 2008-11-05 | 杰富意钢铁株式会社 | Method for producing sintered ore and sintering machine |
| JP2008291356A (en) * | 2007-04-27 | 2008-12-04 | Jfe Steel Kk | Method for producing sintered ore and sintering machine therefor |
| JP2010190439A (en) * | 2009-02-16 | 2010-09-02 | Jfe Steel Corp | Sintering machine |
| CN102232120A (en) * | 2008-12-01 | 2011-11-02 | 杰富意钢铁株式会社 | Process for producing sintered ore |
-
2013
- 2013-07-26 CN CN201310318214.9A patent/CN104342550A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5518585A (en) * | 1978-07-27 | 1980-02-08 | Sumitomo Metal Ind Ltd | Manufacture of sintered ore |
| CN101300366A (en) * | 2005-10-31 | 2008-11-05 | 杰富意钢铁株式会社 | Method for producing sintered ore and sintering machine |
| JP2008291356A (en) * | 2007-04-27 | 2008-12-04 | Jfe Steel Kk | Method for producing sintered ore and sintering machine therefor |
| CN102232120A (en) * | 2008-12-01 | 2011-11-02 | 杰富意钢铁株式会社 | Process for producing sintered ore |
| JP2010190439A (en) * | 2009-02-16 | 2010-09-02 | Jfe Steel Corp | Sintering machine |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106191425A (en) * | 2016-07-25 | 2016-12-07 | 马鞍山钢铁股份有限公司 | A kind of sintering sprays the method adding imflammable gas |
| CN111425884A (en) * | 2018-12-24 | 2020-07-17 | 上海梅山钢铁股份有限公司 | Method for reducing emission concentration of sulfur dioxide in flue gas of full-combustion gas boiler |
| CN111425884B (en) * | 2018-12-24 | 2022-04-15 | 上海梅山钢铁股份有限公司 | Method for reducing emission concentration of sulfur dioxide in flue gas of full-combustion gas boiler |
| CN112325653A (en) * | 2020-09-28 | 2021-02-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Repairing method of metal mixer lining |
| CN112325653B (en) * | 2020-09-28 | 2022-09-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Repairing method of metal mixer lining |
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Application publication date: 20150211 |