CN107090536A - Dry and wet mixing method converter gas one-time dedusting cleaning system - Google Patents

Dry and wet mixing method converter gas one-time dedusting cleaning system Download PDF

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Publication number
CN107090536A
CN107090536A CN201710492010.5A CN201710492010A CN107090536A CN 107090536 A CN107090536 A CN 107090536A CN 201710492010 A CN201710492010 A CN 201710492010A CN 107090536 A CN107090536 A CN 107090536A
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CN
China
Prior art keywords
tower
dry
wet
cooling
method equipment
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Pending
Application number
CN201710492010.5A
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Chinese (zh)
Inventor
魏久鸿
刘钰川
冯忠
江保兴
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Liaoning Jet Engineering Energy Technology Co Ltd
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Liaoning Jet Engineering Energy Technology Co Ltd
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Priority to CN201710492010.5A priority Critical patent/CN107090536A/en
Publication of CN107090536A publication Critical patent/CN107090536A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • C21C5/38Removal of waste gases or dust
    • C21C5/40Offtakes or separating apparatus for converter waste gases or dust
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The present invention is to be related to a kind of improvement of converter gas purification structure.Dry and wet mixing method converter gas one-time dedusting cleaning system, including dry method equipment and wet method equipment, the dry method equipment include gasification cooling flue, first order phase change wet cooling tower(EC towers), efficient cyclone gas wash tower and dry ash storage tank;The wet method equipment includes two grades of water film evaporation cooling scrubbing towers, high-efficiency low-resistance pressure regulation circular seam Venturi tube, dynamic wave bathing case, three-level Wen ring evaporation cooling scrubbing tower and high-efficiency dehydration deentrainment tower.Present invention incorporates dry method and Wet technique each advantage and China's converter practical operation situation.The system dust removing excellent effect, energy consumption are low, water consumption is small, stable simple to operate, later maintenance expense is low, are once dust collection of converter technology Future Development directions.The technology had both met the requirement of sustainable development of iron and steel industry, also complied with national industry and environmental protection policy.

Description

Dry and wet mixing method converter gas one-time dedusting cleaning system
Technical field
The present invention is to be related to a kind of improvement of converter gas purification structure.
Background technology
At present, converter gas one-time dedusting mainly has two kinds of " wet method " and " dry method ".The former using Japan the old and new OG methods as Represent, the dust in converter gas is trapped using twin-stage venturi or the wet scrubbing of tower circumferential weld, returned with sludge or slurry form Receive and utilize, 90% or so is accounted for using the old and new's OG craft dust removal modes in once dust collection of converter system.The latter is with the LT dry method of Germany To represent, the dust in converter gas is trapped using dry type devaporizer+dry electric precipitation device, profit is reclaimed in dry ash form With accounting for 15% or so using dry process dedusting method in once dust collection of converter system.The existing converter coal gas purification of China with Recovery system, mostly using traditional wet dedusting technology (OG methods).
OG wet methods are that nippon and Kawasaki company develop jointly the converter coal gas purification recovery technology developed.OG Several parts such as method system is mainly cooled down by flue gas, purified, coal-gas recovering and sewage disposal are constituted.Flue gas purification system includes two-stage Venturi tube, dehydrator and water mist separator, flue gas enter flue gas purification system after cooling through cooling stack, after being handled through water spray, The flue dust in flue gas is removed, the sewage with flue dust send sintering plant as shaft furnace and burning through the processing such as separation, concentration, dehydration, sludge Raw material is tied, the coal gas after purification is recycled.New OG methods are in former OG methods(Overflow Venturi tube+RD Venturi tubes+dehydrator)'s On the basis of changed after one kind(Spray column+circumferential weld device+dehydrating tower)Wet dust removal mode.Forth generation is developed into i.e. " text of a tower one " system.The major defect of OG methods is high energy consumption, water consumption is big, system resistance damage is big, sewage disposal is complicated, run into This height.
LT dry method is to develop jointly the converter coal gas purification developed by German LURGI and Di Sen steel mills to reclaim skill Art, LT methods system is mainly cooled down by flue gas, purified, reclaimed and several parts such as dust briquetting are constituted, and its flue gas drops through cooling stack Enter flue gas purification system after temperature, flue gas makes its temperature continue to be down to 180 ~ 200 DEG C by devaporizer, while by quenched Processing, reduces the ratio resistance of flue dust and have collected coarse powder dirt, enter electric cleaner by the flue gas of preliminary treatment, by entering one The purification of step, the dust accepted by electric cleaner and devaporizer is sent to briquetting station through conveyer, and hot-forming powder agglomates can It is directly used in pneumatic steelmaking.The major defect of LT methods is that device structure is complicated, and fault rate is high, explosion-proof, unload quick-fried, dust stratification problem and dash forward Go out, investment is big, operation and maintenance cost is high.
The content of the invention
In view of the deficienciess of the prior art, to be to provide a kind of efficiency of dust collection high for the technical problems to be solved by the invention Dry and wet mixing method once dust collection of converter gas cleaning integrated system.
The present invention adopts the following technical scheme that to complete:Dry and wet mixing method converter gas one-time dedusting cleaning system, Including dry method equipment and wet method equipment, it is characterised in that:The dry method equipment includes gasification cooling flue, first order phase change and evaporates cold But tower(EC towers), efficient cyclone gas wash tower and dry ash storage tank, the exhaust outlet of converter connects first order phase change by gasification cooling flue Wet cooling tower(EC towers), first order phase change wet cooling tower(EC towers)The port of export connects high-effective dust-removing tower by U-shaped exhaust gases passes, U-shaped exhaust gases passes bottom and high-effective dust-removing tower bottom connect dry ash storage tank by valve;
The wet method equipment includes two grades of water film evaporation cooling scrubbing towers, high-efficiency low-resistance pressure regulation circular seam Venturi tube, dynamic wave bathings Case, three-level Wen ring evaporation cooling scrubbing tower and high-efficiency dehydration deentrainment tower, the high-effective dust-removing tower output end connection of dry method equipment are wet Two grades of water film evaporations cooling scrubbing tower of method equipment, two grades of water film evaporation cooling scrubbing tower output end connection dynamic wave bathing cases are defeated Enter end, dynamic wave bathing case output end connects the input of high-efficiency low-resistance pressure regulation circular seam Venturi tube, high-efficiency low-resistance pressure regulation circumferential weld text The output end connection three-level Wen ring evaporation cooling scrubbing tower input of family name's pipe, three-level Wen ring evaporation cooling scrubbing tower output end Connect high-efficiency dehydration deentrainment tower, high-efficiency dehydration deentrainment tower output end connecting fan system.
As another preferred scheme, Pneumatic conveyer is provided with described dry ash storage tank.
The beneficial effects of the invention are as follows:Present invention incorporates dry method and Wet technique, each advantage and China's converter are actual Running situation, multi-stage, efficient can not only solve that dry method is explosion-proof, unload quick-fried, dust stratification, the problems such as equipment operation maintenance amount is big, simultaneously Also solve the problems such as wet method water consumption is big, the resistance of high energy consumption, system damages big.The system dust removing excellent effect, energy consumption are low, water consumption Small, stable simple to operate, later maintenance expense is low, is once dust collection of converter technology Future Development direction.The technology was both full The requirement of sufficient sustainable development of iron and steel industry, also complies with national industry and environmental protection policy.
The process route of dry, wet two parts multistage-combination dedusting is used in the present invention, dry method dust part uses three Level(First order phase change wet cooling tower evaporates cooling and dedusting+U-shaped exhaust gases passes water conservancy diversion ash discharge+efficient cyclone gas wash tower centrifugal cyclone Dedusting)Go out the form of dry ash dedusting.Wet dedusting uses Pyatyi(Water film evaporation cooling scrubbing tower+dynamic wave bathing case bathing is removed Dirt+circular seam Venturi tube low-resistance pressure regulation atomization washing+Wen's ring evaporation cooling scrubbing tower+dehydrating demisting tower dehydrating demisting)Wash mist Dirt combining form is eliminated, has gathered dry method dust and has gone out dry ash and wet dedusting to small grain size dust particle washing seizure purification effect The high respective advantage of rate, improves 50%, using this hair using the more single dry and wet technique of the efficiency of dust collection of this technical scheme Bright technical scheme ensures that converter gas one-time dedusting is granular material discharged and is less than 30 mg/Nm3Standard, meets national 50 mg/Nm3Mark It is accurate.
The processing technology routine dry method dust that the system is used using multistage-combination dry method dust partially due to ensure system Go out dry ash ratio accounts for overall dedusting ash ratio more than 80%, so significantly reduce the efficiency and energy of wet scrubbing dust pelletizing system Power problem, more major problem is that significantly reducing burden for later stage turbid circulating water system, turbid circulating water system can cut off swash plate with The operation of coarse granule piece-rate system, the reagent consumption of saving more than 50%, improving reduces water process while purifying water standard Cost more than 50%.
Raising more steel mill in the future dedusting ash self-circulation system operation that the system goes out dry ash ratio has laid solid Basis, is pressed into that ball revolution furnace system is personal will to reduce ton steel cost more than 10 yuan certainly, energy-saving to have a high potential.In whole steel Iron industry underproduction energy, economic situation is depressed, under environmental protection standard increasingly strict overall background, is to increase the good recipe of steel mill's benefit.
In addition, multiple stage circulation water washing systematic difference of the present invention will substantially reduce exhaust gas temperature, exhaust gas volumn is reduced, can Lifting system dust collection capacity, reduces improvement cost on the premise of original blower fan is not changed.Water saving more than 20%, reduces nitrogen The usage amount and intensity of atomizing lance, save the nitrogen consumption and water consumption of dust pelletizing system.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
In figure, 1 converter, 2 gasification cooling flues, 3 first order phase change wet cooling towers(EC towers), 4 flue gas buffer adjusting devices And ascent stage, 5 efficient cyclone gas wash towers, 6 two grades of water film evaporations cooling scrubbing towers, 7 high-efficiency low-resistance pressure regulation circular seam Venturi tubes, 8 move Reeb bathing case, 9 three-level Wen rings evaporation cooling scrubbing tower, 10 high-efficiency dehydration deentrainment towers, 11 drain water seals and are turned over 12 push-pull valves Plate valve, 13 dry ash storage tanks, 14 blower fan systems.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and detailed description.
With reference to the accompanying drawings shown in 1, dry and wet mixing method converter gas one-time dedusting cleaning system, including dry method equipment and wet method are set It is standby, it is characterised in that:The dry method equipment includes gasification cooling flue, first order phase change wet cooling tower(EC towers), efficient cyclone Gas wash tower and dry ash storage tank, the exhaust outlet of converter connect first order phase change wet cooling tower by gasification cooling flue(EC towers), one Level phase transformation wet cooling tower(EC towers)The port of export connects high-effective dust-removing tower, U-shaped exhaust gases passes bottom and height by U-shaped exhaust gases passes Dedusting tower bottom is imitated to connect in dry ash storage tank, described dry ash storage tank provided with Pneumatic conveyer, the valve by valve For push-pull valve and flap valve;
The wet method equipment includes two grades of water film evaporation cooling scrubbing towers, high-efficiency low-resistance pressure regulation circular seam Venturi tube, dynamic wave bathings Case, three-level Wen ring evaporation cooling scrubbing tower and high-efficiency dehydration deentrainment tower, the high-effective dust-removing tower output end connection of dry method equipment are wet Two grades of water film evaporations cooling scrubbing tower of method equipment, two grades of water film evaporation cooling scrubbing tower output end connection dynamic wave bathing cases are defeated Enter end, dynamic wave bathing case output end connects the input of high-efficiency low-resistance pressure regulation circular seam Venturi tube, high-efficiency low-resistance pressure regulation circumferential weld text The output end connection three-level Wen ring evaporation cooling scrubbing tower input of family name's pipe, three-level Wen ring evaporation cooling scrubbing tower output end Connect high-efficiency dehydration deentrainment tower, high-efficiency dehydration deentrainment tower output end connecting fan system.
The system is using process:During the oxygen furnace steel of converter 1, about 1500 DEG C of high-temperature flue gas carries average 100 (Fluctuation range 70-200)g/Nm3Dust overflow into petticoat pipe from fire door, flue gas is cooled to by gasification cooling flue 2 700~900 DEG C.Subsequent flue gas enters first order phase change wet cooling tower(EC towers)3, first order phase change wet cooling tower 3 is by vaporific Water spray, direct cooled flue gas, injection flow rate is accurately controlled according to flue gas heat content, and the water sprayed is evaporated completely, flue gas It is always dry flue gas in tower.First order phase change wet cooling tower 3 is also may rely on the deceleration of air-flow and entered in addition to cooled flue gas Coarse grained flue dust is separated in wetting of the water droplet to flue dust at mouthful, reaches the purpose of dedusting.Flue gas evaporates from first order phase change Out rear temperature is down to about 300 DEG C to cooling tower 3, enters efficient cyclone gas wash tower 5 by U-shaped exhaust gases passes 4, after treatment cigarette The dust of mass content more than 80% is captured recovery into dry ash storage tank 13 and air-transport system in the form of dry ash in gas, Dry ash is drained into dry ash storage tank by controlling push-pull valve and flap valve 12 to open and close, then discharged with Geldart-D particle.Flue gas Out two grades of water film evaporations are subsequently entered from dry method equipment through flue and cool down scrubbing tower 6, and dynamic wave bathing case 8, high-efficiency low-resistance is adjusted Circular seam Venturi tube 7 is pressed, three-level Wen ring, which evaporates, cools down scrubbing tower 9, equipment refined dedusting, the dehydrating demisting such as high-efficiency dehydration deentrainment tower 10 Particle content in flue gas is reduced to 30mg/Nm afterwards3Hereinafter, flue-gas temperature is reduced to less than 55 degree.High-efficiency dehydration deentrainment tower 10 outlet ends connecting fan systems 14.Dynamic wave bathing case 8 and the dust-laden sewage warp of the bottom of high-efficiency dehydration deentrainment tower 10 discharge Drain water seal by outdoor newly-built chute enter turbid circulating water processing system, it is purified after recycled again, system is all to be contained Dustiness water need not carry out Water Treatment.
Preferred embodiment of the invention described in detail above.It should be appreciated that one of ordinary skill in the art without Need creative work just can make many modifications and variations according to the design of the present invention.Therefore, all technologies in the art Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea Technical scheme, all should be in the protection domain being defined in the patent claims.

Claims (2)

1. dry and wet mixing method converter gas one-time dedusting cleaning system, including dry method equipment and wet method equipment, it is characterised in that:Institute Stating dry method equipment includes gasification cooling flue, first order phase change wet cooling tower(EC towers), efficient cyclone gas wash tower and dry ash storage tank, The exhaust outlet of converter connects first order phase change wet cooling tower by gasification cooling flue(EC towers), first order phase change wet cooling tower (EC towers)The port of export connects high-effective dust-removing tower by U-shaped exhaust gases passes, and U-shaped exhaust gases passes bottom and high-effective dust-removing tower bottom lead to Cross valve connection dry ash storage tank;
The wet method equipment includes two grades of water film evaporation cooling scrubbing towers, high-efficiency low-resistance pressure regulation circular seam Venturi tube, dynamic wave bathings Case, three-level Wen ring evaporation cooling scrubbing tower and high-efficiency dehydration deentrainment tower, the high-effective dust-removing tower output end connection of dry method equipment are wet Two grades of water film evaporations cooling scrubbing tower of method equipment, two grades of water film evaporation cooling scrubbing tower output end connection dynamic wave bathing cases are defeated Enter end, dynamic wave bathing case output end connects the input of high-efficiency low-resistance pressure regulation circular seam Venturi tube, high-efficiency low-resistance pressure regulation circumferential weld text The output end connection three-level Wen ring evaporation cooling scrubbing tower input of family name's pipe, three-level Wen ring evaporation cooling scrubbing tower output end Connect high-efficiency dehydration deentrainment tower, high-efficiency dehydration deentrainment tower output end connecting fan system.
2. dry and wet mixing method converter gas one-time dedusting cleaning system according to claim 1, it is characterised in that:Described Pneumatic conveyer is provided with dry ash storage tank.
CN201710492010.5A 2017-06-26 2017-06-26 Dry and wet mixing method converter gas one-time dedusting cleaning system Pending CN107090536A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108424990A (en) * 2018-03-28 2018-08-21 北京首钢国际工程技术有限公司 A kind of ironmaking technique of fusion and reduction coal gas of high temperature processing system
CN111921317A (en) * 2020-07-21 2020-11-13 湖北瑞力源环保科技有限公司 A gas cleaning device for spray roasting hydrochloric acid regenerating unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU637135A1 (en) * 1977-07-04 1978-12-15 Донецкий Филиал Научно-Исследовательского И Проектного Института По Очистке Технологических Газов,Сточных Вод И Использований Вторичных Энергоресурсов Предприятий Черной Металлургии Method of purifying flue gases from dust
CN102580437A (en) * 2012-02-21 2012-07-18 中冶华天工程技术有限公司 Converter primary flue gas dual-tower purification method and converter primary flue gas purification tower
CN202786303U (en) * 2012-08-08 2013-03-13 北京京诚泽宇能源环保工程技术有限公司 Converter gas wet-dry hybrid dust removal system
CN105063273A (en) * 2015-09-04 2015-11-18 江苏博际喷雾系统有限公司 Converter primary flue gas low-energy-consumption semidry-process dust removal system
CN204999932U (en) * 2015-09-04 2016-01-27 江苏博际喷雾系统有限公司 Primary smoke of converter low energy consumption semidry method dust pelletizing system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU637135A1 (en) * 1977-07-04 1978-12-15 Донецкий Филиал Научно-Исследовательского И Проектного Института По Очистке Технологических Газов,Сточных Вод И Использований Вторичных Энергоресурсов Предприятий Черной Металлургии Method of purifying flue gases from dust
CN102580437A (en) * 2012-02-21 2012-07-18 中冶华天工程技术有限公司 Converter primary flue gas dual-tower purification method and converter primary flue gas purification tower
CN202786303U (en) * 2012-08-08 2013-03-13 北京京诚泽宇能源环保工程技术有限公司 Converter gas wet-dry hybrid dust removal system
CN105063273A (en) * 2015-09-04 2015-11-18 江苏博际喷雾系统有限公司 Converter primary flue gas low-energy-consumption semidry-process dust removal system
CN204999932U (en) * 2015-09-04 2016-01-27 江苏博际喷雾系统有限公司 Primary smoke of converter low energy consumption semidry method dust pelletizing system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108424990A (en) * 2018-03-28 2018-08-21 北京首钢国际工程技术有限公司 A kind of ironmaking technique of fusion and reduction coal gas of high temperature processing system
CN111921317A (en) * 2020-07-21 2020-11-13 湖北瑞力源环保科技有限公司 A gas cleaning device for spray roasting hydrochloric acid regenerating unit

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Application publication date: 20170825