CN101386897B - Iron-smelting technology of SDRF furnace - Google Patents
Iron-smelting technology of SDRF furnace Download PDFInfo
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- CN101386897B CN101386897B CN200710092696.5A CN200710092696A CN101386897B CN 101386897 B CN101386897 B CN 101386897B CN 200710092696 A CN200710092696 A CN 200710092696A CN 101386897 B CN101386897 B CN 101386897B
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Abstract
The invention belongs to the class of a metallurgical technology, in particular to a technology of an ironmaking process in an SDRF furnace. The invention consists of a smelting gas making furnace and a reduction shaft furnace; hot sponge iron, coke, lump coal and flux in the smelting gas making furnace are added from a material charging and distributing system on the top of the furnace; pulverized coal, pulverized ore and a ferrous powder material are sprayed from an oxygen spraygun arranged in a wind port and a furnace body; by blowing into mass pure oxygen, both molten iron and reduced coal gas are produced and transported to the reduction shaft furnace to produce the sponge iron; raw materials used by the reduction shaft furnace are added into the furnace through the material charging and distributing system on the top of the furnace; the raw materials and hot reducing gas blown in from the wind port of the furnace body react to produce the sponge iron; the sponge iron taps off the furnace through a cooling section of the shaft furnace; about half of heat is transported to the smelting gas making furnace; and the other half is supplied to the outside. The ironmaking process in the SDRF furnace can simultaneously produce two products of the molten iron and the sponge iron; resource and energy in production are recycled substantially; therefore, the technology is a circular economy process and a clean production process which utilize the resource and the energy most effectively.
Description
Technical field
The present invention belongs to metallurgical technology class, particularly can produce two kinds of products of molten iron and sponge iron simultaneously, is also the SDRF stove iron-smelting process technology of the most economical recycling industries and clean production of energy utilization.
Background technology
Iron-smelting process technology, has modern blast furnace technology, Direct Reduction Technology and smelting reduction technology at present.Blast-furnace technique and smelting reduction technology are produced molten iron, and Direct Reduction Technology is produced sponge iron.
The very ripe advanced person of modern blast furnace ironmaking technology, must use coke, must join and build corresponding coke-oven plant but exist; It is main that blast furnace feeding raw material adopts high basicity sinter, the burden structure of suitably arrange in pairs or groups acidic pellet ore or part lump ore, and blast furnace system must be joined and built corresponding sintering plant.The shortcomings such as blast furnace process long flow path, investment are large, environmental pollution serious (especially coke-oven plant, sintering plant).
With Direct Reduction Technology, produce sponge iron, technology maturation, production method gas fiduciary point 80%, but owing to being subject to oil, natural gas source and price limit, very slow at Chinese development, high, also uneconomical with the investment of coal generating gas long flow path.
COREX smelting reduction technology is unique melting reduction iron-smelting method that has dropped into industrial-scale production.It is few with coke, environmental protection good, can produce in a large number the coal gas that can do material gas again.But COREX iron-smelting device also exists following shortcoming:
1, huge structure, output is 1000M
3it highly approaches 4000M the COREX of level blast furnace
3the blast furnace of level, owing to wanting introduction of foreign technology and major equipment, body part output investment ratio blast furnace is high by 77.7%, all the output investment ratio blast furnace high by 30% (comprising self-built oxygen station) of the unit pig iron.
2, must use the block furnace charges such as lump ore, pellet and lump coal, and physicochemical property is had relatively high expectations.
3, the high temperature reduction gas of 1050-1100 ℃ that melting gasification furnace produces, must drop to 820-850 ℃Gong top reduction furnace and use.Cause very large heat-energy losses and waste.
4, COREX top gas is good material gas, and it is burnt or generated electricity when fuel, does not embody its value, does not have most economical utilization to account for half this material gas (only South Africa produces sponge iron as reducing gas) of total energy consumption.
Summary of the invention
The object of the invention is to overcome the deficiency of above-mentioned iron-smelting process, a kind of SDRF stove iron-smelting process technology is provided.It can produce molten iron and two kinds of products of sponge iron simultaneously, also has the output of appropriate coal gas, is the iron-smelting process technology of most economical, the cleaner production of resource circulation utilization.
Object of the present invention realizes by following proposal:
1) SDRF stove iron-smelting process technology is comprised of several major parts such as melting producer, reduction shaft furnace, coal gas treatment systems, and melting producer and reduction shaft furnace are arranged in parallel in a framework, a public feeding system; The structure of melting producer is that tuyere zone ,Zai top that the cupola well identical with blast furnace, a top are total oxygen air blast is that bosh, furnace bosh, shaft, topmost add an ellipse vault and form.
2) thermal sponge iron and coke, lump coal, flux are added by the charging cloth system of furnace roof, fine coal, fine ore and iron-containing waste spray into from being located at the oxygen lance of air port and shaft, by being blown into a large amount of pure oxygens (pure oxygen air blast), can not only produce molten iron, also produced containing (H2+CO) and be approximately 85% high temperature reduction coal gas (1050-1100 ℃) simultaneously, reducing gas is drawn by dedusting and is participated in cold reducing gas from furnace roof and is down to 800-850 ℃, sends into reduction shaft furnace and produces sponge iron.
3) reduction shaft furnace is that reducing gas be take CO as the high pressure shaft furnace of leading, furnace top pressure is 300KPa, raw material is 80% pellet and 20% lump ore, charging cloth system by furnace roof adds in stove, react with the thermal reduction gas of sending into from shaft air port and generate sponge iron, after the loosening roller in shaft furnace bottom, cooling section, come out of the stove, approximately half delivers to melting producer by pipeline thermal, second half send steelmaking system or after Passivation Treatment outside supply.
4) top gas of reduction shaft furnace, after dust removal process, removes CO by pressure-swing absorption apparatus (PSA)
2after make reducing gas, then send into that hotblast stove is heated to after 850 ℃ and the thermal reduction gas of melting producer mixes and sends in reduction shaft furnace through pressurization.
Accompanying drawing explanation:
Accompanying drawing is SDRF stove iron-smelting process technological system figure
In figure, part 1 is melting producer, and part 2 is reduction shaft furnace, part 3 is the main conveyor of material loading, and part 4 is furnace roof feeding machine, and part 5 is the loading device of melting producer, the charger pan that part 6 is thermal sponge iron, the loading device that part 7 is reduction shaft furnace, part 8 is gravity type boat davit fly-ash separator, part 9 is hot tornado dust collector, part 10 is shaft furnace furnace roof gas line, part 11 is dry gas cleaning, and part 12 is purified gas pipeline, and part 13 is CO
2remove device, part 14 gas compressors, part 15 is hotblast stove, part 16 send device for pneumatic heat, part 17 is hot gas delivery press, part 18 send pipeline for outer for sponge iron heat, part 19 send pipeline for sponge iron heat, part 20 is outer for sponge iron storage tank, part 21 is that raw coke oven gas pipeline part 22 is coal gas mixing duct, part 23 is thermal reduction gas line, part 24 is for sending gas line outside, part 25 is hotblast stove branch gas tube road, part 26 is cold reducing gas pipeline, part 27 is cold high pressure reducing gas air flue, part 28 is high pressure reducing gas pipeline, part 29 is thermal reduction gas line, part 30 oxygen blast air ports, part 31 is sponge iron cooling recirculation system, the cold reducing gas small transfer line of part 32, part 33 is reducing gas small transfer line, part 34 is fine coal/fine ore injection system, part 35 is dust-removing powder collection blowing device, part 36 is iron notch, part 37 is slag notch, part 38 is TRT top pressure power generation, part 39 is gas chamber.
Embodiment
Below in conjunction with accompanying drawing, an embodiment of the present utility model is further described:
SDRF stove iron-smelting process technology is comprised of melting producer 1 and reduction shaft furnace 2, and melting producer 1 and reduction shaft furnace 2 are arranged in parallel in a framework, a public feeding system.
The raw material that stock yard comes is delivered to melting producer and reduction shaft furnace furnace roof transhipment belt 4 through feed belt 3, loading device 5 by lump coal, coke and flux through melting producer packs in melting producer 1, packs lump ore, pelletizing into reduction shaft furnace 2 through the loading device 7 of reduction shaft furnace.Oxygen is sent in melting producer 1 by oxygen blast air port 30, and powder-material (fine coal, fine ore, ground flux) sprays into stove 1 through injection system 34, and iron dust containing sprays into stove 1 through injection system 35.The sponge iron that reduction shaft furnace 2 is produced, adopt pressurized gas Pneumatic conveyer 16 parts to send pipeline 19 to send into furnace top bin 6 through sponge iron heat and send into the loading device 5 of melting producer again and pack melting producer 1 into, a part is sent pipeline 18 to send steelworks or send outer for the 20 outer confessions of sponge iron storage tank for sponge iron heat through outer in addition.
The lump coal and the coke that from melting producer furnace roof, add are heated rapidly by furnace high-temperature reducing gas, lump coal is also by coking, form red-hot coke bed, the sponge iron adding from gas smelting furnace processed top and the iron-containing charge spraying into are melted by high temperature reduction heated by gas very soon, through red-hot coke bed, form molten iron and slag and arrive cupola well, at cupola well, realize slag iron separated, regularly from iron notch 36, tap a blast furnace, from slag notch 37, slag tap.The oxygen that oxygen blast air port, gas smelting furnace processed bottom 30 blasts and coal, coke burn the heat and the high temperature reduction coal gas that provide enough.High temperature reduction coal gas is derived and is entered gravity type boat davit fly-ash separator 8 from melting producer top raw coke oven gas pipeline 21, high temperature reduction gas after dedusting enters coal gas mixing duct 22 to be mixed with the cold reducing gas of shaft furnace furnace roof through dedusting, decarburization, pressure treatment of sending here through cold high pressure reducing gas pipeline 27, and temperature drops to through 820-850 ℃.Enter hot tornado dust collector 9, dedusting is sent in shaft furnace 2 by thermal reduction gas line 23.
Reduction shaft furnace top gas is derived by top gas of reduction shaft furnace pipeline 10, enters 11 dedustings of dry type gas dust remover, and after dedusting, wherein most of coal gas enters CO by purified gas pipeline 12
2deviate from device 13, reduction shaft furnace top gas is deviate from the cold reducing gas obtaining after CO2, by cold reducing gas pipeline 26, through gas compressor 14 pressurizations, by high pressure reducing gas pipeline 28, send into hotblast stove 15 heating, through thermal reduction gas line 29, send into reduction shaft furnace 2 and make reducing gas.A part of coal gas send TRT hydraulic recovery generating 38 through sending gas line 24 outside in addition, enters gas chamber 39 storages, through sending the outer confession of gas line 24 outside after decompression again.In addition for the sponge iron after cooling reduction arranges sponge iron cooling recirculation system 31 in the bottom of reduction shaft furnace 2, by the cold high pressure reducing gas of cold reducing gas pipeline 32 supply; For providing the source of the gas of air conveying sponge iron to be provided with hot gas delivery press 17 and supply high pressure reducing gas small transfer line 33; For provide fuel to be provided with hotblast stove branch gas tube road 25 supply fuel gas to hotblast stove.
The benefit that SDRF stove iron-smelting process technology is brought:
A, create a kind of heating molten steel of both having produced, produce again sponge iron, also have the environmental protection of suitable coal gas output, energy-conservation, water-saving SDRF stove ironmaking novel process.
B, employing injection technology, pulverized coal injection, fine ore and flux, spray coal amount and reach 300kg/t iron significantly; Burden structure is controlled on optimum proportion, thereby significantly by low molten iron and sponge iron cost.
C, minimizing dust, discharge of wastewater, accomplish zero release substantially, reduces CO as far as possible
2discharge, can make full use of the purer CO2 (purity 87.4%) that deviates from production process as industrial chemicals.
The sponge iron that d, reduction shaft furnace are produced is hot, adopts 600 ℃ of charging, apparatus for distributing that are transported to continuously melting producer top of pressurized gas to pack in stove.
E, melting producer have and sponge iron can be smelted into qualified molten iron, and the dual-use function of a large amount of high temperature reduction gas occurs again.Except adding lump coal, coke, sponge iron from melting producer top, also in stove, spray into fine coal, fine ore and ground flux significantly.The sponge iron adding from top is able to carburizing, temperature raising, is reduced into molten iron eventually through the dynamic bed of high temperature coke under melt.
F, melting producer generation high temperature reduction coal gas function are different from coal generating gas stove completely, and melting producer has sprayed into suitable flux, at crucible zone, have liquid slag iron separated and have a function of moving towards of powerful adjustment hot metal composition and sulphur.Most sulphur enter slag, 5% the sulphur that only approximately enters stove total sulfur is transferred in high temperature reduction coal gas, this coal gas can be directly used in the raw factory of reduction shaft furnace sponge iron, the slag making of coal generating gas stove and desulfuration in furnace function a little less than, most sulphur enter high temperature reduction coal gas, and this coal gas must just can send the raw factory of reduction shaft furnace sponge iron after desulfurization.
(1050-1100 ℃) high temperature reduction coal gas that g, melting producer produce mixes cold reducing gas that vertical furnace top gas makes after treatment and makes reducing gas drop to 800-850 ℃ to send reduction shaft furnace to, saved a large amount of heat energy.
H, top gas of reduction shaft furnace dedusting adopt dry cloth bag, and the gas ash of its generation and melting producer stock gas dedusting ash are all sprayed in stove from melting producer top and bottom by air conveying.SDRF stove is exported without gas ash, without the water treatment system of wet gas cleaning complexity.
I, SDRF stove iron-smelting process technology, a large amount of fine ores, fine coal, iron-containing waste have been recycled, all use dry method dust, water saving, heat energy, chemical energy are also all fully utilized, realize two tons of iron of one ton of fuel production (one ton of molten iron and one ton of sponge iron), thereby significantly by low molten iron cost, form the recycling economy technique of the most economical cleaner production of resource, energy utilization.
Claims (9)
1.SDRF stove iron-smelting process, is characterized in that: melting producer, reduction shaft furnace and coal gas treatment system three parts, consist of, melting producer and reduction shaft furnace are arranged in parallel in a framework, a public feeding system; The structure of melting producer is that tuyere zone ,Zai top that the cupola well identical with blast furnace, a top are total oxygen air blast is that bosh, furnace bosh, shaft, topmost add an ellipse vault and form; The thermal sponge iron that melting producer is used and coke, lump coal, flux are added by the charging cloth system of furnace roof, fine coal, fine ore and iron dust containing spray into from being located at the oxygen lance of air port and shaft, by being blown into a large amount of pure oxygens, not only produce molten iron, produced containing H simultaneously
2the temperature of+CO 85% is 1050-1100 ℃ of reducing gas, sends into reduction shaft furnace and produces sponge iron; Reduction shaft furnace raw material used is added in stove by the charging cloth system of furnace roof, react with the thermal reduction gas of sending into from shaft air port and generate sponge iron, after reduction shaft furnace cooling section, come out of the stove, a part is delivered to melting producer by pipeline thermal, and another part send steelmaking system or outer confession after Passivation Treatment.
2. SDRF stove iron-smelting process according to claim 1, it is characterized in that: reduction shaft furnace adopts reducing gas to take CO as the high pressure reduction shaft furnace of leading, steam stove pressure on top surface is 300KPa, reducing gas temperature 820-850 ℃, reduction shaft furnace bottom arranges the cold gas lesser circulation of loosening material roller and the cooling use of sponge iron.
3. iron-smelting process according to claim 1, is characterized in that: the reducing gas that reduction shaft furnace reducing gas used is made after being processed by melting producer and reduction shaft furnace top gas is supplied with continuously, and the raw material of reduction shaft furnace is pellet 80% and lump ore 20%.
4. iron-smelting process according to claim 1, is characterized in that: melting producer and reduction shaft furnace are arranged in juxtaposition, and a melting producer reduction shaft furnace in parallel, shares a furnace body frame and a feeding system.
5. iron-smelting process according to claim 1, it is characterized in that: the 1050-1100 ℃ of high temperature reduction coal gas that melting producer is produced, the cold reducing gas blending cooling of making after treatment with reduction shaft furnace top gas, makes to mix cold reducing gas and drops to 820-850 ℃ and enter reduction shaft furnace.
6. iron-smelting process according to claim 1, it is characterized in that: melting producer sprays into flux, at crucible zone, there is liquid slag iron separated and have a function of moving towards of powerful adjustment hot metal composition and sulphur, most sulphur enter slag, 5% the sulphur that only enters stove total sulfur is transferred in high temperature reduction coal gas, and this coal gas can be directly used in reduction shaft furnace and produce sponge iron.
7. according to the iron-smelting process described in claims 1, it is characterized in that: the sponge iron that reduction shaft furnace is produced hot be 600 ℃, the charging cloth system that adopts compression reducing gas pipeline to be transported to melting producer top packs in stove.
8. iron-smelting process according to claim 1, is characterized in that: top gas of reduction shaft furnace dedusting adopts dry method dust, and the dedusting ash of the various fly-ash separators of stock gas is all sprayed in stove by air conveying foldback melting producer ，Cong top and bottom.
9. iron-smelting process according to claim 1, is characterized in that: melting producer and reduction shaft furnace overhaul simultaneously, stops production, not because utilizing the different a large amount of coal gas diffusion problems that cause of working hour in equipment year from coal gas simultaneously.
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU91547B1 (en) * | 2009-04-03 | 2010-10-04 | Wurth Paul Sa | Method and installation for producing direct reduced iron |
| CN101603109B (en) * | 2009-07-07 | 2011-01-05 | 中冶赛迪工程技术股份有限公司 | Process for treating top gas of reduction shaft furnace |
| CN101935729B (en) * | 2009-10-22 | 2012-07-04 | 中冶赛迪工程技术股份有限公司 | Top loading process for iron-smelting process furnace |
| CN101935730B (en) * | 2009-10-22 | 2011-11-16 | 中冶赛迪工程技术股份有限公司 | Furnace top charging process in iron-making process |
| CN101935731B (en) * | 2009-10-22 | 2011-12-21 | 中冶赛迪工程技术股份有限公司 | Top charging process for iron-making process furnace |
| CN103290160B (en) * | 2012-02-29 | 2015-03-04 | 宝山钢铁股份有限公司 | Process for producing direct reduced iron (DRI) by carrying out pure oxygen gasification on semicoke |
| CN103966380B (en) * | 2013-01-24 | 2016-06-29 | 宝山钢铁股份有限公司 | A kind of method recycling shaft furnace top coal gas dust removal powder |
| KR101561278B1 (en) * | 2013-11-04 | 2015-10-16 | 주식회사 포스코 | Apparatus and method for collecting dust of furnace gas |
| CN107502694B (en) * | 2017-08-16 | 2023-07-14 | 宝钢工程技术集团有限公司 | Shaft furnace air inlet device and shaft furnace air inlet method |
| CN110305998B (en) * | 2019-06-28 | 2021-03-16 | 武汉钢铁有限公司 | Online regulation and control method and device for reducing S content in blast furnace gas |
| CN110655959B (en) * | 2019-11-11 | 2024-05-14 | 新疆八一钢铁股份有限公司 | CO is removed to ouye stove gas2Device and method for controlling the same |
| CN113913579B (en) * | 2021-10-12 | 2023-01-24 | 中冶赛迪工程技术股份有限公司 | Circulation method for cooling hot sponge iron |
| CN115449579B (en) * | 2022-08-23 | 2023-12-19 | 攀钢集团西昌钢钒有限公司 | Low-carbon smelting reduction iron-making method and device |
| CN115491453B (en) * | 2022-08-23 | 2023-12-19 | 攀钢集团西昌钢钒有限公司 | PLCsmelt smelting reduction iron-making method and device |
| CN115558733A (en) * | 2022-09-21 | 2023-01-03 | 宝钢工程技术集团有限公司 | Gas utilization device for COREX smelting reduction furnace and use method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1123330A (en) * | 1995-09-19 | 1996-05-29 | 冶金工业部重庆钢铁设计研究院 | Composite furnace device |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1123330A (en) * | 1995-09-19 | 1996-05-29 | 冶金工业部重庆钢铁设计研究院 | Composite furnace device |
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