CN107447072A - A kind of steelmaking converter flue gas dust collecting system - Google Patents
A kind of steelmaking converter flue gas dust collecting system Download PDFInfo
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- 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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- gas
- steelmaking converter
- flue gas
- dust collecting
- collecting system
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
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
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710906913.3A CN107447072A (en) | 2017-09-29 | 2017-09-29 | A kind of steelmaking converter flue gas dust collecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710906913.3A CN107447072A (en) | 2017-09-29 | 2017-09-29 | A kind of steelmaking converter flue gas dust collecting system |
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| Publication Number | Publication Date |
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| CN107447072A true CN107447072A (en) | 2017-12-08 |
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ID=60497471
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| CN201710906913.3A Pending CN107447072A (en) | 2017-09-29 | 2017-09-29 | A kind of steelmaking converter flue gas dust collecting system |
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Cited By (4)
| 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 |
| CN109280736A (en) * | 2018-11-30 | 2019-01-29 | 天津正元合科技开发有限公司 | A kind of converter vaporization cooling new process |
| CN114774622A (en) * | 2022-04-27 | 2022-07-22 | 马鞍山钢铁股份有限公司 | Steelmaking equipment based on low-carbon emission for steelmaking |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| CN109280736A (en) * | 2018-11-30 | 2019-01-29 | 天津正元合科技开发有限公司 | A kind of converter vaporization cooling new process |
| CN114774622A (en) * | 2022-04-27 | 2022-07-22 | 马鞍山钢铁股份有限公司 | Steelmaking equipment based on low-carbon emission for steelmaking |
| CN114774622B (en) * | 2022-04-27 | 2023-07-28 | 马鞍山钢铁股份有限公司 | Steelmaking-based low-carbon-emission steelmaking equipment |
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Application publication date: 20171208 |
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