CN107447072A - A kind of steelmaking converter flue gas dust collecting system - Google Patents

A kind of steelmaking converter flue gas dust collecting system Download PDF

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Publication number
CN107447072A
CN107447072A CN201710906913.3A CN201710906913A CN107447072A CN 107447072 A CN107447072 A CN 107447072A CN 201710906913 A CN201710906913 A CN 201710906913A CN 107447072 A CN107447072 A CN 107447072A
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CN
China
Prior art keywords
gas
steelmaking converter
flue gas
dust collecting
collecting system
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710906913.3A
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Chinese (zh)
Inventor
刘华平
廖勇
张生策
郑锡辉
谢超
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Sichuan Desheng Group Vanadium Titanium Co Ltd
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Sichuan Desheng Group Vanadium Titanium Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Sichuan Desheng Group Vanadium Titanium Co Ltd filed Critical Sichuan Desheng Group Vanadium Titanium Co Ltd
Priority to CN201710906913.3A priority Critical patent/CN107447072A/en
Publication of CN107447072A publication Critical patent/CN107447072A/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 invention discloses a kind of steelmaking converter flue gas dust collecting system, it includes steelmaking converter, movable gas hood, evaporated flue, waste heat boiler and dust arrester, the top that movable gas hood is arranged on steelmaking converter is connected with evaporated flue, evaporated flue connects waste heat boiler, waste heat boiler connects with one-time dedusting equipment, one-time dedusting equipment connects heat exchanger, heat exchanger connecting secondary cleaner, three-way switch valve is connected after final dusting equipment, three-way switch valve connects with CO retracting devices and gas cooler respectively, CO retracting devices connect diffusing tower, gas cooler connects gas chamber;The steam (vapor) outlet of the waste heat boiler is connected with the top that steam pipe is arranged on movable gas hood, and the steam pipe is provided with stop valve and regulating valve.The present invention solve the problems, such as existing dust pelletizing system not enough save, emission reduction, environmental protection, synergy.

Description

A kind of steelmaking converter flue gas dust collecting system
Technical field
The present invention relates to a kind of dust pelletizing system, and in particular to a kind of steelmaking converter flue gas dust collecting system, belongs to steelmaking converter Flue gas ash removal and heat recovery technology field.
Background technology
Steelmaking converter refers to oxygen top-blown converter, containing top and bottom combined blown converter.Blast-melted progress converter is blown both at home and abroad at present Oxygen steel-making turns into main process for making.Converter dust, refer to steel in smelting and combustion process, with flue gas ascension It is deposited on the dust particle in flue or outside effusion flue.Flue gas enters the referred to as flue gas principal series of dust pelletizing system through evaporated flue System, i.e. a flue gas;The flue gas escaped from fire door and other positions, referred to as subsystem, are also secondary flue gas.Contain simultaneously in flue gas There is substantial amounts of dust, dust content is up to 150~200g/Nm3.Converter gas has high temperature, poisonous, inflammable and explosive, dustiness The features such as high.In the extensive steel and iron industry of tradition, flue dust is expelled directly out with stack gases, is contaminated air and soil.Especially It is noxious fume contained in flue dust, heavy damage ecological environment, influences health.Therefore, furnace gas caused by steel-making It is required for after dedusting or reclaims or discharges.
At present, converter gas dust removal method mainly has two kinds of dry and wet.Most representational wet dedusting is " double texts The technological process of formula ", abbreviation OG methods, all in this way, the flow is for current most of converter:Converter gas is through cover Skirt, I to IV section of gasification cooling flue cooling are down to 800 DEG C or so by 1600 DEG C, then enter a text, two texts further cool and removed Dirt, then enter through centrifugal blower to three-way switch valve, the qualified entrance recovery system of coal gas, the flue gas for not reaching coal-gas recovering requirement Enter diffusing tower igniting discharge.This method has the following disadvantages:The dedusting water that (1) one text, two texts need is very big;(2) steam and Wet dust is bonded to Vanes on Induced Draft Fan, causes rotor unbalance, causes blower fan vibrations damage, fault rate is high, and it is normal to influence system Stable operation;(3) the easy fouling of system, causes dust collection capacity to decline, and dust collecting effect and clean-up effect are deteriorated, and fire door flue dust is excessive, Diffusing tower emits tobacco;(4) SR is big, and power consumption is high;(5) sludge treating process is complicated and easily causes secondary pollution;(6) by Wen's tube efficiency influences, and smoke dust discharge concentration is higher.
The converter gas dry method technology that German LURGI and Thyssen Aktiengesellschaft develop jointly at the end of the sixties is dry method dust Representative, referred to as " LT " method.System is mainly made up of devaporizer, electrostatic precipitator and gas cooler, and the flow is:Cigarette Gas is introduced into devaporizer after evaporated flue latter end comes out, using double media (water and steam) by flue gas from 800--1000 DEG C 200--300 DEG C is down to, enters electric cleaner, dust content is dropped into 10mg/m3, then carried out coal-gas recovering or waste gas is put Dissipate.Popularization is in the whole nation and the world to expand in application.Its water consumption is relatively low, per 0.2-0.4 ton of water consumption per ton steel, eliminates Huge water treatment system, stove dirt are in dry powdered form.Manage and operate but investment is high, in operation and require high.
In existing method for treating converter flue gas, either " OG " method still " LT " method from its technique in itself, all has developed to It is quite complete.But analyzed from converter gas resources performance, existing common problem is that converter gas resources performance is minimized:
(1) 800-1000 DEG C of smoke heat energy can not recycle;
(2) converter CO coal gas becomes aqueous and vapor coal gas of converter;
(3) iron oxide calcium oxide stove dirt changes its primary characteristic, can not directly apply.
The problem of existing existing dust collecting process dust removal process of converter gas is present:
(1) either " OG " method still " LT " method, is all to realize flue gas cool-down and dedusting with water resource intervening mode, removes Dirt process consumes great lot of water resources." OG " method need to spray water 3-5t/t steel (recirculated water, need to mend new water 10-20%);" LT " method needs Water spray 0.2t/t steel, steam 0.025t/t steel.With " LT " method 1,000,000 tons of steel are produced per year to calculate, year 200000 tons of water consumption, consumption steam 2.5 Ten thousand tons;The process of dedusting is to consume the process of water resource;
(2) water sprayed into flue gas, under worst hot case, becomes steam class flue gas, increases exhaust gas volumn, follow-up dedusting Device, air-introduced machine, gas cooler load all increase therewith, bring power consumption to increase;
(3) all do not handled for secondary flue gas.
The content of the invention
In view of this, in view of the shortcomings of the prior art, the present invention provides a kind of steelmaking converter flue gas dust collecting system, solves existing There is dust pelletizing system not enough to save, emission reduction, environmental protection, synergy the problem of.
To solve above technical problem, the technical scheme is that using a kind of steelmaking converter flue gas dust collecting system, it Including steelmaking converter, movable gas hood, evaporated flue, waste heat boiler and dust arrester, it is characterised in that:Movable gas hood is arranged on refining The top of steel converter is connected with evaporated flue, and evaporated flue connection waste heat boiler, the dust arrester includes one-time dedusting equipment With final dusting equipment, waste heat boiler connects with one-time dedusting equipment, one-time dedusting equipment connection heat exchanger, heat exchanger connection two Secondary cleaner, three-way switch valve is connected after final dusting equipment, and three-way switch valve cools down with CO retracting devices and coal gas respectively Device connects, CO retracting devices connection diffusing tower, gas cooler connection gas chamber;The steam (vapor) outlet of the waste heat boiler is connected with Steam pipe is arranged on the top of movable gas hood, and the steam pipe is provided with stop valve and regulating valve, passes through Steam dilution Converter The secondary flue gas of mouth effusion, alleviates environmental protection pressure, and its steam flow rate can be adjusted using regulating valve controlling opening of valve, enter iron Valve opening is tuned up when water and smelting, and in tapping and slag splashing, valve opening is turned down, is closed and is cut off when not smelting for a long time Valve cuts off steam.
Further, high temperature immediate action valve is provided with below the movable gas hood, burner is provided with evaporated flue. The burner is that steelmaking converter is fast in non-oxygen blowing phase and Primary period and later stage, the high temperature closed under movable gas hood Fast valve, mix afterburning using collected coal gas and air and produce high-temperature flue gas continuous enough and be operated. In Primary period and later stage, coal gas CO contents are less than 35%, pass through burner and unnecessary oxygen using collected coal gas of converter Gas, which carries out combustion reaction, makes the CO contents in whole blowing process be more than 35%, consumes oxygen unnecessary in flue gas, reduces oxygen content Less than 1%, the condition of gas explosion is eliminated.
Preferably, the one-time dedusting equipment is high-temperature cyclone dust extractor, eliminates more than 3 microns of grit, flue gas is contained Dust quantity reduces, and is follow-up final dusting equipment load shedding, while removes the kindling material of bulky grain in smoke abatement, prevents the fire of enough energy Kind enters coal gas system, eliminates explosion condition.
Further, the final dusting equipment is sack cleaner, and its function is refined dedusting, makes dust emission concentration < 30mg/m3
Preferably, the sack cleaner should be antiknock blast resistance construction, and whole cloth bag should be seal, and its shell is steel plate Manufactured cylindrical shape, top are that semicircle is spherical, and bottom is turbination;Bottom sets and unloads grey outlet, and it is double to unload installation in ash outlet Layer unloading valve, centre are equipped with isolation cabin, prevent air from entering;The body upper and lower part of the sack cleaner is provided with relief valve.
Further, the heat exchanger is tubular heat exchanger.
Further, the jet chimney, which is arranged on the horizontal pipeline of the top of movable gas hood, is provided with several solid matters Nozzle, the steam for ejecting steam pipe form an exhaust mist, emit tobacco in more uniform dilution fire door effusion.
The technological process of steelmaking converter flue gas dust collecting system provided by the invention is:Converter gas is after movable gas hood is collected Being cooled down in into evaporated flue and waste heat boiler and reclaim heat energy, the sensible heat almost all of flue gas is converted into steam, then through once Dust concentration is reduced to 30mg/m by cleaner and final dusting equipment3Hereinafter, last flue gas is qualified through three-way switch valve Coal gas enters gas chamber and reclaimed after cooling, and the flue gas for not reaching coal gas requirement enters diffusing tower burning and exhausting;Waste heat pot simultaneously Steam caused by stove draws a part and the secondary flue gas of converter mouth effusion is diluted to movable gas hood top, effectively administers The phenomenon emitted outside stokehold tobacco, alleviates environmental protection pressure.
By the setting of burner, make high-temperature flue gas continuous production, the rapid heat cycle for solving former converter flue causes Equipment expand with heat and contract with cold problem, stable cigarette temperature extends the service life of air flue equipment, while the oxygen content of flue gas is begun It is less than 1% eventually, ensure that the security of coal-gas recovering.
Compared with prior art, the advantage of the invention is that:Dust pelletizing system of the present invention is full dry cloth-bag dusting, eliminates water Jie The intervention of matter, its is simple in construction, and flexible arrangement, small investment, operating cost is low, and bag-type dust emission compliance is stable, dust removal process Energy-conservation, emission reduction, environmental protection, synergy are realized, there is obvious economic benefit and social benefit.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Marginal data:
1- steelmaking converters, 2- movable gas hoods, 3- evaporated flues, 4- waste heat boilers, 5- high-temperature cyclone dust extractors, 6- tubulations change Hot device, 7- sack cleaners, 8- three-way switch valves, 9-CO retracting devices, 10- diffusing towers, 11- gas coolers, 12- coal gas Cabinet;
21- high temperature immediate action valves, 22- burners;
131- stop valves, 132- regulating valves, 133- nozzles.
Embodiment
In order that those skilled in the art more fully understands technical scheme, it is below in conjunction with the accompanying drawings and preferred real Applying mode, the present invention is described in further detail.It should be pointed out that following preferred embodiments are not construed as to this hair Bright limitation, protection scope of the present invention should be defined by claim limited range.For the common of the art For technical staff, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, these improve and Retouching also should be regarded as protection scope of the present invention.
Referring to Fig. 1, the invention provides a kind of steelmaking converter flue gas dust collecting system, and it includes steelmaking converter 1, movable gas hood 2nd, evaporated flue 3, waste heat boiler 4 and dust arrester, movable gas hood 2 is arranged on the top of steelmaking converter 1 and evaporated flue 3 connects Connect, evaporated flue 3 connects waste heat boiler 4, and the lower section of movable gas hood 2 is provided with high temperature immediate action valve 21, set in evaporated flue 2 It is equipped with burner 22;The dust arrester includes high-temperature cyclone dust extractor 5 and sack cleaner 7, and waste heat boiler 4 revolves with high temperature Wind deduster 5 connects, and high-temperature cyclone dust extractor 5 connects tubular heat exchanger 6, and tubular heat exchanger 6 connects sack cleaner 7, cloth bag Three-way switch valve 8 is connected after deduster 7, three-way switch valve 8 is connected with CO retracting devices 9 and gas cooler 11 respectively, and CO is returned Receiving apparatus 9 connects diffusing tower 10, and gas cooler 11 connects gas chamber 12;The steam (vapor) outlet of the waste heat boiler 4 is connected with steaming Steam pipe 13 is arranged on the top of movable gas hood 2, is provided with stop valve 131 and regulating valve 132 in the steam pipe 13, is arranged on work The nozzle 133 of several solid matters is provided with the steam horizontal pipeline of the top of dynamic petticoat pipe 2.
Above-mentioned burner 22 is steelmaking converter in non-oxygen blowing phase and Primary period and later stage, closing movable gas hood Under high temperature immediate action valve, mix afterburning using collected coal gas and air and produce high-temperature flue gas continuous enough and enter Row work.In Primary period and later stage, coal gas CO contents are less than 35%, pass through burner using collected coal gas of converter Carrying out combustion reaction with unnecessary oxygen makes the CO contents in whole blowing process be more than 35%, consumes oxygen unnecessary in flue gas, reduces Oxygen content is less than 1%, eliminates the condition of gas explosion.
The function of above-mentioned high-temperature cyclone dust extractor 5 is to eliminate more than 3 microns of grit, dust content is reduced, after being Continuous sack cleaner load shedding, while the kindling material of bulky grain in smoke abatement is removed, prevent the kindling material of enough energy from entering coal gas system System, eliminate explosion condition.
The function of above-mentioned sack cleaner 7 is refined dedusting, makes dust emission concentration < 30mg/m3.The sack cleaner should For antiknock blast resistance construction, whole cloth bag should be seal, and its shell is cylindrical shape made of steel plate, and top is that semicircle is spherical, bottom Portion is turbination;Bottom sets and unloads grey outlet, unloads and Double-deck cinder discharge valve is installed in ash outlet, and centre is equipped with isolation cabin, prevents sky Gas enters;The body upper and lower part of the sack cleaner is provided with relief valve.
The technological process of flue gas dust collecting system of the present invention is:Converter gas enters evaporated flue 3 after the collection of movable gas hood 2 Cooling interior with waste heat boiler 4 simultaneously reclaims heat energy, and the sensible heat almost all of flue gas is converted into steam, then through high-temperature cyclone dust extractor 5 After rough dedusting, temperature to the operating temperature of sack cleaner is reduced by tubular heat exchanger 6 and enters sack cleaner 7 by dust concentration It is reduced to 30mg/m3Hereinafter, last flue gas is reclaimed into gas chamber 12, reached through three-way switch valve 8, qualified coal gas after cooling Flue gas less than coal gas requirement enters the burning and exhausting of diffusing tower 10;Steam caused by waste heat boiler 4 draws a part to work simultaneously The secondary flue gas of converter mouth effusion is diluted above dynamic petticoat pipe, has effectively administered outside the tobacco of stokehold the phenomenon emitted, is alleviated Environmental protection pressure.The stove dirt of deduster recycling on the spot, through dispensing, metering, mixing, compacting, screening, turns into Dephosphorising agent for converter, Slugging accelerator, cooling agent, as furnace charge, for converter smelting.
Illustrate that dust pelletizing system of the present invention maximizes the large resource efficiency of flue gas three by taking 80t converter high-temperature flue gas as an example:(80t About 1,000,000 tons of steel is produced in converter per year)
1st, converter gas heat energy:
Year ten thousand tons of producing steam 7-8;And can superheated steam 15-16 ten thousand tons (steam containing evaporated flue), lifted steam quality; Steam can generate electricity.
2nd, coal gas of converter:
To be anhydrous in follow-up coal gas, gas quality gets a promotion, and it is coal gas user's burning condition to improve heating furnace;Low heat value Coal gas can reclaim;Also collect high PG.
3rd, converter dust:Furnace dust resources, bring environmental protection after stove and lift economic benefit;
Dust pelletizing system of the present invention realizes energy-saving and emission-reduction:With reference to LT methods, year economizes on water about 200,000 tons;Reference LT methods, in the Spring Festival holidays Press about 2.5 ten thousand tons of steam;Bag-type dust is invested than electric precipitation, operating cost is lower;It is lower than " OG " method operating cost;In flue gas Anhydrous, flue gas volume reduces, blower fan power saving;Gas cooler is economized on water;" OG " method of elimination water spray process, sewage sludge processing work Sequence;Waste gas discharge is reduced without steam and CO;Floor space is small, and flexible arrangement.
To sum up, dust pelletizing system of the present invention is full dry cloth-bag dusting, eliminates the intervention of aqueous medium, and its is simple in construction, arrangement spirit Living, small investment, operating cost is low, and bag-type dust emission compliance is stable, and dust removal process realizes energy-conservation, emission reduction, environmental protection, synergy, With obvious economic benefit and social benefit.

Claims (8)

1. a kind of steelmaking converter flue gas dust collecting system, including steelmaking converter, movable gas hood, evaporated flue, waste heat boiler and dedusting Device, it is characterised in that:The top that movable gas hood is arranged on steelmaking converter is connected with evaporated flue, evaporated flue connection waste heat pot Stove, the dust arrester include one-time dedusting equipment and final dusting equipment, and waste heat boiler connects with one-time dedusting equipment, once Cleaner connects heat exchanger, heat exchanger connecting secondary cleaner, connects three-way switch valve after final dusting equipment, threeway is cut Change valve to connect with CO retracting devices and gas cooler respectively, CO retracting devices connection diffusing tower, gas cooler connection coal gas Cabinet;The steam (vapor) outlet of the waste heat boiler is connected with the top that steam pipe is arranged on movable gas hood, and the steam pipe, which is provided with, to be cut Disconnected valve and regulating valve.
A kind of 2. steelmaking converter flue gas dust collecting system according to claim 1, it is characterised in that:Below the movable gas hood High temperature immediate action valve is provided with, burner is provided with evaporated flue.
A kind of 3. steelmaking converter flue gas dust collecting system according to claim 1, it is characterised in that:The one-time dedusting equipment For high-temperature cyclone dust extractor.
A kind of 4. steelmaking converter flue gas dust collecting system according to claim 1, it is characterised in that:The final dusting equipment For sack cleaner.
A kind of 5. steelmaking converter flue gas dust collecting system according to claim 4, it is characterised in that:The sack cleaner Shell is cylindrical shape made of steel plate, and top is that semicircle is spherical, and bottom is turbination;Bottom sets and unloads grey outlet, unloads ash and goes out Double-deck cinder discharge valve is installed on mouthful.
A kind of 6. steelmaking converter flue gas dust collecting system according to claim 4, it is characterised in that:The sack cleaner Body upper and lower part is provided with relief valve.
A kind of 7. steelmaking converter flue gas dust collecting system according to claim 1, it is characterised in that:The heat exchanger is tubulation Heat exchanger.
A kind of 8. steelmaking converter flue gas dust collecting system according to claim 1, it is characterised in that:The jet chimney is set The nozzle of several solid matters is provided with the horizontal pipeline of the top of movable gas hood.
CN201710906913.3A 2017-09-29 2017-09-29 A kind of steelmaking converter flue gas dust collecting system Pending CN107447072A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107893143A (en) * 2017-12-18 2018-04-10 北京京诚泽宇能源环保工程技术有限公司 A kind of dry dedusting of converter residual neat recovering system and technique
CN108823352A (en) * 2018-06-21 2018-11-16 中国科学院力学研究所 A kind of converter gas dry type waste heat recycling dust-extraction unit and method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2846429Y (en) * 2005-11-25 2006-12-13 王义新 Pure dry type purifier for oxygen convertor smoke
CN1962884A (en) * 2006-12-07 2007-05-16 昆明阳光数字技术股份有限公司 Dry-method dust collection and surplus energy recovery device for steel-smelting converter flue gas
CN1971191A (en) * 2006-12-07 2007-05-30 昆明阳光数字技术股份有限公司 Process for recovery of excess energy of flue gas from converter
CN101144111A (en) * 2007-07-02 2008-03-19 昆明阳光基业股份有限公司 Technique and combined system for removing dust from steelmaking convertor smoke by dry method and reusing waste heat
CN102538497A (en) * 2012-03-01 2012-07-04 九源天能(北京)科技有限公司昆明分公司 Method and device for recovery and full-effect utilization of flue gas thermal energy of steel converter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2846429Y (en) * 2005-11-25 2006-12-13 王义新 Pure dry type purifier for oxygen convertor smoke
CN1962884A (en) * 2006-12-07 2007-05-16 昆明阳光数字技术股份有限公司 Dry-method dust collection and surplus energy recovery device for steel-smelting converter flue gas
CN1971191A (en) * 2006-12-07 2007-05-30 昆明阳光数字技术股份有限公司 Process for recovery of excess energy of flue gas from converter
CN101144111A (en) * 2007-07-02 2008-03-19 昆明阳光基业股份有限公司 Technique and combined system for removing dust from steelmaking convertor smoke by dry method and reusing waste heat
CN102538497A (en) * 2012-03-01 2012-07-04 九源天能(北京)科技有限公司昆明分公司 Method and device for recovery and full-effect utilization of flue gas thermal energy of steel converter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107893143A (en) * 2017-12-18 2018-04-10 北京京诚泽宇能源环保工程技术有限公司 A kind of dry dedusting of converter residual neat recovering system and technique
CN108823352A (en) * 2018-06-21 2018-11-16 中国科学院力学研究所 A kind of converter gas dry type waste heat recycling dust-extraction unit and method

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Application publication date: 20171208