CN100455678C - Smelting reduction furnace coal-injection process - Google Patents
Smelting reduction furnace coal-injection process Download PDFInfo
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- CN100455678C CN100455678C CNB2006100540541A CN200610054054A CN100455678C CN 100455678 C CN100455678 C CN 100455678C CN B2006100540541 A CNB2006100540541 A CN B2006100540541A CN 200610054054 A CN200610054054 A CN 200610054054A CN 100455678 C CN100455678 C CN 100455678C
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Abstract
The present invention relates to a coal dust injection process in a melting reduction iron making method, which belongs to the class of metallurgy. Raw coal sent from a raw material yard is firstly sieved by wet coal, wherein the raw coal with the diameter of more than or equal to 20mm is directly sent to a mine groove and is loaded in a daily ration coal bin, and the raw coal with the diameter of less than 20mm is sent to a coal drying system; before the raw coal is dried, the water content is 10%, and the water content of the dried coal is less than or equal to 5%; the dried coal is sieved by a double-layer screen, wherein the raw coal with the diameter of more than or equal to 6mm is sent to a mine groove system, and is loaded in the daily ration coal bin, the raw coal with the diameter of 3 to 6mm is directly sent to the mine groove system, and is loaded in a coal dust daily ration bin, and the two parts of the coal are added from the top of the melting gasification furnace; fine coal with the raw coal diameter of less than or equal to 3mm is injected by a pea coal injection process, and fine coal with the raw coal diameter of less than or equal to 3mm is directly injected. The present invention has the advantages of no need of a coal briquette procedure, reduced investment of a coal briquette system and reduced production cost of iron melt. The present invention can be applied to the melting reduction iron making method, and various fluxes, such as limestone powder, dolomite powder or a flux and mixed ore powder, etc., are injected into a a COREX melting reduction gasification furnace by similar methods.
Description
Technical field
The present invention belongs to coal-injection process in the metallurgical class, particularly melting reduction iron-smelting method.
Background technology
The COREX iron smelting method is the melting reduction iron-smelting method that has dropped into industrial-scale production.The exploitation of this technology starts from the end of the seventies in last century, by German KORF engineering corporation and VAI unite carry out small-scale test after, in 1981 the Ke Er in Germany (KEHL/RHINE) built up the pilot-plant test device (being the KR method) of producing 60000 tons of molten iron per year, utilize this device to carry out totally 6000 hours pilot-plant test 10 times.By 1987, tested 18 kinds of coals and 14 kinds of lump ores, pelletizing and agglomerate from all over the world altogether, proved the feasibility of this technology.1985 South African Iron and Steel Corporation (ISCOR) adopted this technology, on Pretoria depleted blast furnace foundation, built up first COREX iron-smelting device of producing 300000 tons of molten iron per year in the world in November, 1987.Through the tests in 2 years and improvement, put into serial production in 1989, just reached design objective after one month, this method suitability for industrialized production successfully is the once breakthrough progress of melting and reducing technology, becomes the new model of iron-smelting process.
At present, the COREX device of producing in the world has following quadruplet:
1) Korea S Pu item factory (Pohang)
First C2000 COREX stove produces molten iron 60～800,000 t/a, goes into operation in nineteen ninety-five.This factory produces stable, and operating rate surpasses 95%, and the output coal gas of COREX stove is used for generating.
2) India JINDAL factory
Two C2000 COREX stoves, the COREX stove produces molten iron 2 * 800,000 t/a, and first suit places oneself to go into operation in December, 1999, and second suit places go into operation August calendar year 2001.Output coal gas is used for generating and produces pellet.
3) South Africa SALDANHA factory
A C2000 COREX stove+direct reduction shaft furnace, the COREX stove produces molten iron 650,000 t/a, goes into operation in December, 1998.COREX stove output coal gas is used for direct reduction furnace and produces direct-reduced iron.The furnace charge lump ore that the COREX stove uses is 80%.
The COREX coal-supply system is: at first through wet screen branch, wherein raw coal diameter 〉=20mm directly send the ore deposit groove by coal loading coal day feed bin to the raw coal that stock yard is sent here; The dehumidification system of delivering coal of raw coal diameter＜20mm.The moisture of coal is 10% before dry, moisture≤5% of dry back coal.Dried coal is through screening, and wherein raw coal diameter 〉=6mm directly send the ore deposit groove by coal loading coal day feed bin, the briquetting system that delivers coal of raw coal diameter＜6mm, and coal briquette send ore deposit groove coal briquette day feed bin.
This coal-supply system complex process, the investment of coal briquette system is high, the molten iron cost height.
Summary of the invention
The purpose of this invention is to provide a kind of COREX stove coal powder injection technology, the fine coal that sifts out in the COREX stove coal-supply system is directly sprayed into melting gasification furnace, replace coal briquette, thereby will hang down molten iron cost significantly.
Purpose of the present invention realizes by following proposal: at first through wet screen branch, wherein raw coal diameter 〉=20mm directly send the ore deposit groove by coal loading coal day feed bin to the raw coal that the raw material stock ground is sent here, the dehumidification system of delivering coal of raw coal diameter＜20mm.The moisture of coal is 10% before dry, moisture≤5% of dry back coal.Dried coal sieves through double deck screen, wherein raw coal diameter＞6mm directly send ore tank systems loading coal day feed bin, raw coal diameter 3-6mm directly send the ore tank systems fine coal day feed bin of packing into, this two kinds coal day feed bin coal add from the melting gasification furnace top, the fine coal of the raw coal diameter＜3mm fine coal bunker of packing into adopts the beans blowing process to spray into from two planes of melting gasification furnace.
The fine coal of raw coal diameter＜3mm of the present invention is directly jetted, and does not need the coal briquette operation, can reduce the investment of coal briquette system, can reduce the molten iron production cost.
The present invention can be applied in the melting reduction iron-smelting method, can adopt similar method to the COREX fusion reducing furnace vapourizing furnace various flux of jetting, as limestone powder, ground dolomite or flux and ore powder mix.
Description of drawings
Accompanying drawing is a COREX smelting reduction furnace coal-injection process schema
Wherein, part 1 is a reduction shaft furnace, and part 2 is a melting gasification furnace, part 3 is the coal jar, and part 4 is a screw-type coal distributor, and part 5 is a divider, part 6 is a divider, and part 7 is a mixing tank, and part 8 is a mixing tank, part 9 is an oxygen coal spray gun, and part 10 is an oxygen coal spray gun, and part 11 is an oxygen channel, part 12 is responsible for for defeated coal, and part 13 is responsible for for defeated coal, and part 14 is a fine coal day feed bin, part 15 is last coal belt, and part 16 is a coal conveyer belt, and part 17 is a multi-deck screen, part 18 is a coal day feed bin, and part 19 is the winding-up jar, and part 20 is nitrogen or other source of the gas, part 21 is a coal drier, and part 22 is a coal conveyer belt, and part 23 is the feed belt, part 24 is a coal conveyer belt, part 25 is the winding-up arm, and part 26 is the winding-up arm, and part 27 is the fine coal bunker
Embodiment
Below in conjunction with accompanying drawing two embodiment of the present utility model are further described:
The coal that stock yard comes is earlier through wet screen powder, the granularity that screens out fine coal is 8-10mm, fine coal is delivered to coal drier 21 through feed belt 23, dry good coal is delivered to screening building 17 by dry coal belt 22 and is sieved through double deck screen, wherein the raw coal diameter is delivered to ore deposit groove coal day feed bin 18 greater than the coal of 6mm by coal conveyer belt 16, the fine coal of raw coal diameter 3～6mm is delivered to ore deposit groove fine coal day feed bin 14 by coal conveyer belt 24, coal day feed bin 18 and fine coal day feed bin 14 coal add from melting gasification furnace 2 tops through last coal belt 15, coal bunker 3 and screw-type coal distributor 4; The fine coal of raw coal diameter＜3mm enters the fine coal bunker 27 of beans injection system, and the coal of fine coal bunker 27 is discharged into winding-up jars 19, adopt string jar or and jar continuous coal injection of technology; The sponge iron of melting gasification furnace 2 is supplied with by reduction shaft furnace 1.
Defeated powder uses nitrogen or other source of the gas 20, and coal dust is responsible for 12 and 13 through two defeated coals and is distributed coal dust through divider 5 and 6 respectively.The coal dust of divider 5 corresponding COREX melting gasification furnace 2 oxygen tuyere zones sprays into vapourizing furnace through winding-up arm 25, oxygen coal spray gun 9, and oxygen 11 enters oxygen coal spray gun through mixing tank 7, and the quantity of winding-up arm is consistent with the quantity of pci port.The coal dust in divider 6 corresponding COREX melting gasification furnaces 2 charge level districts sprays into vapourizing furnace through winding-up arm 26, oxygen coal spray gun 9, and oxygen 11 enters oxygen coal spray gun 10 through mixing tank 8, and the quantity of winding-up arm is consistent with the quantity of pci port.
The raw coal diameter is jetted after coal-grinding powder process greater than the coal of 6mm.
Can adopt similar method to the COREX fusion reducing furnace vapourizing furnace various flux of jetting, as limestone powder, ground dolomite or flux and ore powder mix.
Claims (3)
1, a kind of smelting reduction furnace coal-injection process is characterized in that: at first through wet screen branch, wherein raw coal diameter 〉=20mm directly send the ore deposit groove by coal loading coal day feed bin to the raw coal that the raw material stock ground is sent here, the dehumidification system of delivering coal of raw coal diameter＜20mm; The moisture of coal is 10% before dry, moisture≤5% of dry back coal; Dried coal sieves through double deck screen, wherein raw coal diameter＞6mm directly send ore tank systems loading coal day feed bin, raw coal diameter 3-6mm directly send the ore tank systems fine coal day feed bin of packing into, through dehumidification system exsiccant coal day feed bin coal and fine coal day feed bin coal add from the melting gasification furnace top, the fine coal of the raw coal diameter＜3mm fine coal bunker of packing into adopts the beans blowing process to spray into.
2, a kind of smelting reduction furnace coal-injection process according to claim 1 is characterized in that: the winding-up of oxygen coal spray gun is double-deck blowing process, promptly in reduction furnace cupola well oxygen supply port and the winding-up of reduction furnace vapourizing furnace charge level.
3, a kind of smelting reduction furnace coal-injection process according to claim 1 is characterized in that: to the powder mix of COREX fusion reducing furnace vapourizing furnace flux blasting or flux and ore.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100540541A CN100455678C (en) | 2006-01-25 | 2006-01-25 | Smelting reduction furnace coal-injection process |
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| CNB2006100540541A CN100455678C (en) | 2006-01-25 | 2006-01-25 | Smelting reduction furnace coal-injection process |
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| CN100455678C true CN100455678C (en) | 2009-01-28 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397598B (en) * | 2007-09-26 | 2010-12-01 | 上海宝钢工程技术有限公司 | Coal fine preparation, blowing method and device from packed-bed smelting reduction furnace |
| CN101831519B (en) * | 2010-05-27 | 2011-11-09 | 莱芜美澳冶金科技有限公司 | High-temperature high-pressure central charging distribution process method and device for melting reduction furnace |
| KR20150072935A (en) * | 2013-12-20 | 2015-06-30 | 주식회사 포스코 | Method and apparatus for manufacturing molten iron |
| CN104946841A (en) * | 2014-03-27 | 2015-09-30 | 宝山钢铁股份有限公司 | Process for making iron by virtue of COREX furnace |
| CN108026596A (en) * | 2015-07-27 | 2018-05-11 | 株式会社Posco | The fine coal device for blowing and its blowing method of smelting furnace |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63247308A (en) * | 1987-04-01 | 1988-10-14 | Kobe Steel Ltd | Smelting-reduction iron making method |
| JPH024909A (en) * | 1988-06-23 | 1990-01-09 | Kawasaki Steel Corp | Smelting reduction method for powdered ore |
| CN1010323B (en) * | 1986-11-25 | 1990-11-07 | 奥地利钢铁联合企业阿尔帕股份公司 | Process and arrangement for gaining electric energy in addition to producing molten pig iron |
| CN1022048C (en) * | 1988-10-25 | 1993-09-08 | 奥地利钢铁联合企业阿尔帕工业设备制造有限公司 | Process and apparatus for making molten iron |
| CN1036075C (en) * | 1994-08-27 | 1997-10-08 | 冶金工业部钢铁研究总院 | Fusion reducing iron smelting method and its equipment |
| CN1046960C (en) * | 1995-02-13 | 1999-12-01 | 霍戈文斯·斯塔尔公司 | Process and apparatus for producing molten pig iron |
| US6562102B1 (en) * | 1998-08-13 | 2003-05-13 | Deutsche Voest-Alpine Industrieanlagenbau Gmbh | Method for producing liquid pig iron |
-
2006
- 2006-01-25 CN CNB2006100540541A patent/CN100455678C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1010323B (en) * | 1986-11-25 | 1990-11-07 | 奥地利钢铁联合企业阿尔帕股份公司 | Process and arrangement for gaining electric energy in addition to producing molten pig iron |
| JPS63247308A (en) * | 1987-04-01 | 1988-10-14 | Kobe Steel Ltd | Smelting-reduction iron making method |
| JPH024909A (en) * | 1988-06-23 | 1990-01-09 | Kawasaki Steel Corp | Smelting reduction method for powdered ore |
| CN1022048C (en) * | 1988-10-25 | 1993-09-08 | 奥地利钢铁联合企业阿尔帕工业设备制造有限公司 | Process and apparatus for making molten iron |
| CN1036075C (en) * | 1994-08-27 | 1997-10-08 | 冶金工业部钢铁研究总院 | Fusion reducing iron smelting method and its equipment |
| CN1046960C (en) * | 1995-02-13 | 1999-12-01 | 霍戈文斯·斯塔尔公司 | Process and apparatus for producing molten pig iron |
| US6562102B1 (en) * | 1998-08-13 | 2003-05-13 | Deutsche Voest-Alpine Industrieanlagenbau Gmbh | Method for producing liquid pig iron |
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