CN108671687A - A kind of dry-method dust-removal device and its technique for the aqueous flue dust of slag - Google Patents
A kind of dry-method dust-removal device and its technique for the aqueous flue dust of slag Download PDFInfo
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- CN108671687A CN108671687A CN201810759606.1A CN201810759606A CN108671687A CN 108671687 A CN108671687 A CN 108671687A CN 201810759606 A CN201810759606 A CN 201810759606A CN 108671687 A CN108671687 A CN 108671687A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/60—Combinations of devices covered by groups B01D46/00 and B01D47/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- 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
- Y02P10/20—Recycling
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
A kind of dry-method dust-removal device and its technique for the aqueous flue dust of slag belongs to smoke and dust treatment technical field.It specifically includes：Flue gas dust collecting system is formed by smoke collecting cover, flue, gas fume valve, wet method pre-duster, solution dehydrates device, flue gas bypass pipe, nonaqueous dust cleaner, dedusting fan, chimney；Solution regeneration cycle is formed by solution dehydrates device, weak solution pipeline, solution regenerator, concentrated solution pipeline and uses system；Water system is formed by water inlet manifold, water inlet pipe, water inlet pipe valve；Sewage recovering system is formed by overflow pipe, blowdown valve, blow-off pipe, solution regenerator branch drain, water seal, main sewer；Dewatering is combined using the pre- dedusting of water spray wet method and solution dehydrates device, realize the dry dedusting technology of aqueous flue dust, advantage is, reduce sewage disposal system, reduces construction investment, weak solution is regenerated using regenerator, realize the recycling of solution, vapor can also be recycled, realize that water resource recycles, reduce environmental pollution.
Description
Technical field
The invention belongs to smoke and dust treatment technical fields, in particular, provide a kind of dry method dust for the aqueous flue dust of slag
Device and its technique.
Background technology
The techniques such as the current STEELMAKING PRODUCTION slag generally use hot application in China, slag stewing, generate a large amount of dust-laden vapor, this portion
It is essentially all uncontrollable discharge to divide each enterprise of dust-laden vapor, and the especially trans-regional fog of north of china in winter slag diffuses, and seriously affects
Atmospheric environment.The vapor corrosion steel construction diffused simultaneously, influences the operation of overhead traveling crane driver, there are security risks.
State Ministry of Environmental Protection is directed within 2017《Steel industry atmosphere pollutants emission standards》(GB 28664-2012) is issued
Standard modification list (exposure draft), it is contemplated that this time modification will be implemented in June, 2018, wherein in STEELMAKING PRODUCTION operation
Dust uncontrollable discharge is made that stringent regulation, smoke dust discharge concentration generally requirement≤20mg/Nm3.In terms of present circumstances,
Administering this partially aqueous flue dust, there are certain technical barriers.
Domestic across the flue gas major part of steelmaking slag causes seriously to pollute also in uncontrollable discharge to environment at present；Have one
Some control emission measures in a organized way have been done by a little big steel mills of state-owned enterprise, and technical solution is all to use wet dedusting technical thought, is controlled
There are mainly two types of reason modes：After being collected one is humid flue gas by the way of direct high altitude discharge, simple system, but use effect
Fruit is bad, and particulate matter not any processing to the greatest extent can not meet environmental requirement；Another kind is washed by spraying using washing tower
The mode washed handles the dust in flue gas, and such mode has use in Baosteel, Zhanjiang, green steel etc., but discharge index is difficult to
Meet 20mg/Nm3Requirement, fail to find the discharge index data record that environmental protection administration provides so far.Tang's second phase in Shoudu Iron and Steel Co capital
The aqueous smoke and dust treatment of slag produced from steel-smelting uses wet electric dust-removing technology for the first time, and in currently implementing, there are systems for the technical solution
Complicated, primary investment is high, water consumption is big, increases the defects of sewage disposal difficulty, and discharge index is also up for further verifying.
In conclusion problem of the existing technology is：Conventional wet lay dedusting technology cannot be satisfied new dust emission and want
It asks, there are system complex, primary investment height, water consumption for wet electric dust-removing technology greatly, increases the defects of sewage disposal difficulty.
Invention content
The purpose of the present invention is designed to provide a kind of dry-method dust-removal device and its work for making steel the aqueous flue dust of slag stewing
Skill；It solves the problems, such as that conventional wet lay dust pelletizing system dust emission can not be up to standard, reduces sewage disposal system, reduce engineering and throw
Money, while vapor can also be recycled, it realizes the recycling of water resource, reduces environmental pollution.
Technical solution of the invention is：The aqueous flue dust that slag generates during slag stewing is caught using smoke catching cover
After collection, the pre- dedusting of water spray wet method is first passed through, then be dehydrated to humid flue gas with solution dehydrates device, reduced aqueous in flue gas
Rate, later flue gas enter nonaqueous dust cleaner and be dusted, the flue gas for meeting emission request is discharged into greatly by dedusting fan through chimney
Gas；In the slag slag stewing process later stage, the exhaust gas volumn of generation largely reduces, and the moisture content in flue gas is also greatly lowered, at this point, adopting
Flue gas after being trapped with smoke catching cover can be directly entered nonaqueous dust cleaner by bypass line and be dusted, and need not carry out
It the pre- dedusting of water spray wet method and is dehydrated with solution dehydrates device, dedusting fan uses frequency conversion fall-back, saves energy consumption, reduces
Operating cost；Weak solution is regenerated using solution regenerator, realizes the recycling of solution, at the same can also to vapor into
Row recycling, realizes the recycling of water resource, reduces environmental pollution.
The present invention the dry-method dust-removal device for the aqueous flue dust of slag include：Flue gas dust collecting system, water system, waste water
Recovery system, solution regeneration cycle use system.First water inlet pipe valve 30 of water system is wet with flue gas dust collecting system
The pre- dedusting water inlet connection of method, the second water inlet pipe 31 and the second water inlet pipe valve 32 of water system are located at braised slag pool 33
Top；The pre- dedusting gap of the overflow pipe 34 of sewage recovering system and the wet method of flue gas dust collecting system 8 is connect, sewage recovering system
The pre- dedusting sewage draining exit of blowdown valve 35 and the wet method of flue gas dust collecting system 7 connect, the solution regenerator draining of sewage recovering system
Branch pipe 44 is connect with solution regeneration cycle using the solution regenerator drain outlet 43 of system, the main sewer of sewage recovering system
37 are located at 33 top of bored slag bath；Solution regeneration cycle uses the solution dehydrates of the weak solution pipeline 38 and flue gas dust collecting system of system
15 connection of device weak solution outlet, solution regeneration cycle use the solution dehydrates of the concentrated solution pipeline 42 and flue gas dust collecting system of system
Device concentrated solution import 14 connects.
Flue gas dust collecting system combines dewatering using the pre- dedusting of water spray wet method and solution dehydrates device, realizes aqueous flue dust
Dry method dust；On the one hand water system meets the spray water supply requirement of wet method pre-duster 5, on the other hand meet braised slag pool 33
Water supply requirement；Solution regeneration cycle realizes the recycling of solution using system, while recycling profit can also be carried out to vapor
With.
Flue gas dust collecting system includes：Smoke collecting cover 1, the first flue 2, the first gas fume valve 3, wet method remove the cloud of dust in advance
Gas import 4, wet method pre-duster 5, the pre- dedusting exhanst gas outlet 6 of wet method, the second flue 10, solution dehydrates device gas inlet
11, solution dehydrates device 12, solution dehydrates device exhanst gas outlet 13, the second gas fume valve 16, third flue 17, nonaqueous dust cleaner
Gas inlet 18, nonaqueous dust cleaner 19, nonaqueous dust cleaner exhanst gas outlet 20, unloading valve 21, the 4th flue 22, dedusting fan
23, the 5th flue 24, chimney 25, flue gas by-pass line 26, third gas fume valve 27；Smoke collecting cover 1 is located at braised slag pool
Aqueous flue dust is collected in top, and exhanst gas outlet is connected with the first flue 2,2 other end of the first flue and the first flue gas
3 air intake of valve connects, and the pre- dedusting gas inlet of 3 outlet air end of the first gas fume valve and wet method 4 is connect, and the pre- dedusting flue gas of wet method goes out
Mouth 6 is connect with the second flue 10, and 10 other end of the second flue is connect with solution dehydrates device gas inlet 11, and solution is de-
Hydrophone exhanst gas outlet 13 is connect with 16 air intake of the second gas fume valve, 16 outlet air end of the second gas fume valve and third flue 17
Connection, 17 other end of third flue connect with nonaqueous dust cleaner gas inlet 18, nonaqueous dust cleaner exhanst gas outlet 20 and the
Four flues 22 connect, and 22 other end of the 4th flue is connect with the air inlet of dedusting fan 23, and dedusting fan 23 goes out
Air port is connect with the 5th flue 24, and 24 other end of the 5th flue is connect with the air inlet of chimney 25, flue gas bypass pipe
Third gas fume valve 27 is housed, 26 one end of flue gas by-pass line picks out from the first flue 2, and the other end is from third on road 26
It is accessed on flue 17, unloading valve 21 is mounted at the lower part ash bucket ash hole of nonaqueous dust cleaner 19.
Water system includes water inlet manifold 28, the first water inlet pipe 29, the first water inlet pipe valve 30, the second water inlet pipe
31, the second water inlet pipe valve 32；Water inlet manifold 28 is divided into the first water inlet pipe 29 and the second water inlet pipe 31, the first water inlet branch
Tube valve 30 be mounted on the first water inlet pipe 29 on, 30 one end of the first water inlet pipe valve with along the first water inlet pipe of water (flow) direction
29 water inlet end connection, the pre- dedusting water inlet of the other end and wet method 9 connects, and the second water inlet pipe valve 32 is intake mounted on second
On branch pipe 31,32 one end of the second water inlet pipe valve is connect with the water inlet end along the second water inlet pipe of water (flow) direction 31, the other end
Connect the outlet conduit and water exit elbow of the second water inlet pipe 31.On the one hand water system meets the spray of wet method pre-duster 5
On the other hand water supply requirement meets the water supply requirement of braised slag pool 33.
Sewage recovering system overflow pipe 34, blowdown valve 35, blow-off pipe 36, main sewer 37, solution regenerator branch drain
44, water seal 45；The pre- dedusting gap of 34 one end of overflow pipe and wet method 8 is connect, and the other end accesses on main sewer 37, blowdown valve 35
The pre- dedusting sewage draining exit of one end and wet method 7 is connect, and the other end is connect with the water inlet end along water (flow) direction blow-off pipe 36, and blow-off pipe 36 is another
One end is accessed on main sewer 37, and 44 one end of solution regenerator branch drain is connect with solution regenerator drain outlet 43, another
End is connect with the water inlet end of water seal 45, and on the water outlet access main sewer 37 of water seal 45, main sewer 37 is located at braised slag pool 33
High-water line above.Sewage recovering system reduces the waste of water resource.
Solution regeneration cycle uses system weak solution pipeline 38, the dilute solution inlet 39 of solution regenerator, solution regenerator
40, the concentrated solution outlet 41 of solution regenerator, concentrated solution pipeline 42；The alkene solution of 38 one end of weak solution pipeline and solution dehydrates device
The dilute solution inlet 39 of 15 connection of outlet, the other end and solution regenerator connects, 42 one end of concentrated solution pipeline and solution dehydrates device
Concentrated solution import 14 connect, 41 connection of concentrated solution outlet of the other end and solution regenerator.
The process step of the invention includes：
1) exhaust gas volumn generated within slag slag stewing initial stage, braised slag pool is larger, and moisture vapor is more in flue gas, at this point, the
One gas fume valve and the second gas fume valve are opened, and the third gas fume valve on flue gas bypass line is closed, and are collected by fume trap cover
Aqueous flue dust initially entered in wet method pre-duster by flue, the water droplet of grit and sprinkling in one side flue gas,
When meeting the processes such as the wetting, cohesion, sedimentation of grit can occur for moisture film or the wall of wetting, device, be separated from gas,
Achieve the purpose that pre- dedusting；Pre- efficiency of dust collection reaches 68-72%；On the other hand due to the cooling effect of water spray, flue gas middle part
Divide Water vapor condensation Cheng Shui, the water separation capability of subsequent solution dehydrator can be reduced；The sewage of wet method pre-duster lower part is regular
Braised slag pool slag stewing is discharged by blowdown valve through main sewer to use, when blowdown valve does not work, wet method pre-duster shower water passes through
Overflow port at the high water level of its underpart also flows into main sewer, flows back to braised slag pool；.
2) from wet method pre-duster come out flue gas by flue enter back into solution dehydrates device dehydration, using solution with
There are larger steam partial pressure, concentrated solutions can absorb the vapor in flue gas rapidly, reach to containing shredded tobacco for water pipes for humid flue gas
The dehydration of gas meets the follow-up requirement for carrying out dry method dust.
3) concentrated solution becomes weak solution after absorbing vapor, and weak solution enters solution after the outflow of solution dehydrates device and regenerates
Device, solution regenerator are vacuum tank, and solution concentration improves to form concentrated solution after weak solution regeneration, then flow back into solution dehydrates device
The middle vapor for absorbing humid flue gas is dehydrated, and is recycled；Vapor in regenerator accumulates in upper space, cold
But under the cooling effect of water, vapor condenses into water again, flows into main sewer by water seal by discharge outlet, flows back to braised slag pool, real
The recycling of existing water resource.
4) it enters back into nonaqueous dust cleaner by flue through the dewatered flue gas of solution dehydrates device to be dusted, dry method is removed
Dirt device is using conventional bag filter or sinter-plate precipitator；Nonaqueous dust cleaner dedusting ash is discharged by ash bucket lower part unloading valve.
5) exhaust gas volumn generated within the slag slag stewing later stage, braised slag pool is smaller, and moisture vapor is also less in flue gas, Ke Yibian
Frequency adjustable speed fan low speed is run, at this point, the first gas fume valve and the second gas fume valve are closed, the third cigarette on flue gas bypass line
Air valve is opened, and the flue dust collected by fume trap cover is directly entered nonaqueous dust cleaner by flue gas bypass line and is dusted.
6) air is discharged by chimney by dedusting fan by the clean gas after nonaqueous dust cleaner dedusting.
The present invention having the beneficial effect that compared with the existing technology：It is combined using the pre- dedusting of water spray wet method and solution dehydrates device
Dewatering, dehydrating effect is good, and moisture content can control within 5% in flue gas；It is burnt again using conventional bag filter or modeling
Version deduster carries out dry method dust, realizes the dry dedusting technology of aqueous flue dust, reduces sewage disposal system, reduces engineering and throws
Money, dust emission index are fully able to satisfaction≤20mg/Nm3Environmental requirement；Weak solution is carried out again using solution regenerator
It is raw, it realizes the recycling of solution, while can also be recycled to vapor, realizes the recycling of water resource.
The invention has the advantages that：It is good to the dehydrating effect of aqueous flue dust, realize the dry dedusting technology to now aqueous flue dust,
High dust collection efficiency, simple system, stable and reliable operation, solve that conventional wet lay dust pelletizing system dust emission can not be up to standard asks
Topic, reduces sewage disposal system, reduces construction investment, using to humid flue gas solution dehydrates and weak solution is carried out again
It is raw, it realizes the recycling of solution, while can also be recycled to vapor, realizes the recycling of water resource, reduce environment
Pollution.
Description of the drawings
Fig. 1 is the schematic diagram of the present invention.Wherein, smoke collecting cover 1, the first flue 2, the first gas fume valve 3, wet method
The pre- dedusting exhanst gas outlet 6 of pre- dedusting gas inlet 4, wet method pre-duster 5, wet method, the pre- dedusting sewage draining exit 7 of wet method, wet method are removed in advance
The pre- dedusting water inlet 9 of dirt gap 8, wet method, the second flue 10, solution dehydrates device gas inlet 11, solution dehydrates device 12,
Solution dehydrates device exhanst gas outlet 13, solution dehydrates device concentrated solution import 14, solution dehydrates device alkene taphole 15, the second smoke valve
Door 16, nonaqueous dust cleaner gas inlet 18, nonaqueous dust cleaner 19, nonaqueous dust cleaner exhanst gas outlet 20, is done third flue 17
Method dust discharging valve of duster 21, the 4th flue 22, dedusting fan 23, the 5th flue 24, chimney 25, flue gas by-pass line
26, third gas fume valve 27, water inlet manifold 28, the first water inlet pipe 29, the first water inlet pipe valve 30, the second water inlet pipe
31, the second water inlet pipe valve 32, braised slag pool 33, overflow pipe 34, blowdown valve 35, blow-off pipe 36, main sewer 37, weak solution pipe
Road 38, solution regenerator dilute solution inlet 39, solution regenerator 40, solution regenerator concentrated solution outlet 41, concentrated solution pipeline 42,
Solution regenerator drain outlet 43, solution regenerator branch drain 44, water seal 45.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated；It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
A kind of dry-dedusting system and its technique for the aqueous flue dust of slag provided in an embodiment of the present invention, is sprayed using water
Drench the pre- dedusting of method and solution dehydrates device combination dewatering, dehydrating effect is good, in flue gas moisture content can control 5% with
It is interior；Version deduster is burnt using conventional bag filter or modeling again and carries out dry method dust, realizes the dry dedusting technology of aqueous flue dust,
Reduce sewage disposal system, reduce construction investment, dust emission index is fully able to satisfaction≤20mg/Nm3Environmental requirement；
Weak solution is regenerated using solution regenerator, realizes the recycling of solution, while can also be recycled to vapor, it is real
The recycling of existing water resource.
The application principle of the present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1, the dry-dedusting system for the aqueous flue dust of slag of the present invention includes：Flue gas dust collecting system, confession
Water system, sewage recovering system, solution regeneration cycle use system.
It is pre- by smoke collecting cover 1, the first flue 2, the first gas fume valve 3, the pre- dedusting gas inlet 4 of wet method, wet method
The pre- dedusting exhanst gas outlet 6 of deduster 5, wet method, the second flue 10, solution dehydrates device gas inlet 11, solution dehydrates device 12,
Solution dehydrates device exhanst gas outlet 13, the second gas fume valve 16, third flue 17, nonaqueous dust cleaner gas inlet 18, dry method
Deduster 19, nonaqueous dust cleaner exhanst gas outlet 20, unloading valve 21, the 4th flue 22, dedusting fan 23, the 5th flue
24, chimney 25, flue gas by-pass line 26, third gas fume valve 27 form flue gas dust collecting system, realize that aqueous flue dust dehydration is laggard
Row dry dedusting technology meets environment protection emission requirement；
By water inlet manifold 28, the first water inlet pipe 29, the first water inlet pipe valve 30, the second water inlet pipe 31, second into
Water branch pipe valve 32 forms water system；On the one hand meet the spray water supply requirement of wet method pre-duster 5, on the other hand meet stewing
The water supply requirement of slag bath 33；
By overflow pipe 34, blowdown valve 35, blow-off pipe 36, main sewer 37, solution regenerator branch drain 44,45 groups of water seal
At sewage recovering system, the waste of water resource is reduced；
By weak solution pipeline 38, the dilute solution inlet 39 of solution regenerator, solution regenerator 40, solution regenerator it is dense molten
Liquid outlet 41, concentrated solution pipeline 42 form solution regeneration cycle and use system；Realize the recycling of solution, while can also be to water
Steam is recycled；
With reference to operation principle and processing step, the invention will be further described；
A kind of dry-dedusting system and its technique for the aqueous flue dust of slag, operation principle and processing step packet
It includes：
1) exhaust gas volumn generated within slag slag stewing initial stage, braised slag pool is larger, and moisture vapor is more in flue gas, at this point, the
One gas fume valve and the second gas fume valve are opened, and the third gas fume valve on flue gas bypass line is closed, and are collected by fume trap cover
Aqueous flue dust initially entered in wet method pre-duster by flue, the water droplet of grit and sprinkling in one side flue gas,
When meeting the processes such as the wetting, cohesion, sedimentation of grit can occur for moisture film or the wall of wetting, device, be separated from gas,
Achieve the purpose that pre- dedusting, efficiency of dust collection about reach 70% or so；On the other hand due to the cooling effect of water spray, flue gas middle part
Divide Water vapor condensation Cheng Shui, so that flue-gas temperature and flue gas moisture content is reduced, the water separation capability of subsequent solution dehydrator can be reduced.
The sewage of wet method pre-duster lower part is periodically discharged into braised slag pool slag stewing through main sewer by blowdown valve and uses, and blowdown valve does not work
When, wet method pre-duster shower water also flows into main sewer by the overflow port at the high water level of its underpart, flows back to braised slag pool.
2) flue gas come out from wet method pre-duster enters back into the dehydration of solution dehydrates device by flue, using some suctions
Aqueous good solution, such as lithium bromide, lithium chloride, the solution such as calcium chloride come into full contact with humid flue gas, using solution with it is aqueous
There are larger steam partial pressure, concentrated solutions can absorb the vapor in flue gas rapidly, reach to humid flue gas for flue gas
Dehydration, moisture control meets the follow-up requirement for carrying out dry method dust within 5% in flue gas.
3) concentrated solution becomes weak solution after absorbing vapor, and weak solution enters solution after the outflow of solution dehydrates device and regenerates
Device, solution regenerator are vacuum tank, and there are heat source and cooling water cooling coil in inside, weak solution after regenerator heating,
Vapor evaporates, and solution concentration improves to form concentrated solution, then flow back into solution dehydrates device absorb the vapor of humid flue gas into
Row dehydration, recycles；The vapor formed after weak solution heating accumulates in the upper space of regenerator, in cooling coil
Under cooling effect, vapor condenses into water again, flows into main sewer by water seal by discharge outlet, flows back to braised slag pool, realizes water money
The recycling in source.
4) it enters back into nonaqueous dust cleaner by flue through the dewatered flue gas of solution dehydrates device to be dusted, dry method is removed
Dirt device reaches 99% or more using conventional bag filter or sinter-plate precipitator, technology maturation, efficiency of dust collection, and dust emission refers to
Mark reaches≤20mg/Nm3；Nonaqueous dust cleaner dedusting ash is discharged by ash bucket lower part unloading valve.
5) exhaust gas volumn generated within the slag slag stewing later stage, braised slag pool is smaller, and moisture vapor is also less in flue gas, Ke Yibian
Frequency adjustable speed fan low speed is run, and saves energy consumption, reduces operating cost, at this point, the first gas fume valve and the second gas fume valve are closed,
Third gas fume valve on flue gas bypass line is opened, and the flue dust collected by fume trap cover is directly entered by flue gas bypass line
Nonaqueous dust cleaner is dusted.
6) air is discharged by chimney by dedusting fan by the clean gas after nonaqueous dust cleaner dedusting.
Using a kind of dry-dedusting system and its technique for the aqueous flue dust of slag, the aqueous flue dust of slag can be substituted
Wet dedusting technique, high dust collection efficiency, simple system, stable and reliable operation solve conventional wet lay dust pelletizing system dust emission
Problem that can not be up to standard reduces sewage disposal system, reduces construction investment, using to humid flue gas solution dehydrates and to dilute
Solution is regenerated, and realizes the recycling of solution, while can also be recycled to vapor, realizes the recycling profit of water resource
With reducing environmental pollution.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (6)
1. a kind of dry-method dust-removal device for the aqueous flue dust of slag, which is characterized in that the invention includes：Including：Flue gas removes
Dirt system, water system, sewage recovering system, solution regeneration cycle use system；First water inlet pipe valve of water system
(30) it is connect with the pre- dedusting water inlet of the wet method of flue gas dust collecting system, the second water inlet pipe (31) of water system and the second water inlet
Branch pipe valve (32) is located at the top of braised slag pool (33)；The wet method of overflow pipe (34) and flue gas dust collecting system of sewage recovering system
Pre- dedusting gap (8) connection, the blowdown valve (35) of sewage recovering system and the pre- dedusting sewage draining exit of wet method of flue gas dust collecting system
(7) it connects, the solution regenerator branch drain (44) of sewage recovering system is regenerated with solution regeneration cycle using the solution of system
Device drain outlet (43) connects, and the main sewer (37) of sewage recovering system is located above bored slag bath (33)；Solution regeneration cycle
It is connect with the solution dehydrates device weak solution of flue gas dust collecting system outlet (15) using the weak solution pipeline (38) of system, solution regeneration
The concentrated solution pipeline (42) of recycling system is connect with the solution dehydrates device concentrated solution import (14) of flue gas dust collecting system；
Flue gas dust collecting system combines dewatering using the pre- dedusting of water spray wet method and solution dehydrates device, realizes the dry of aqueous flue dust
Method dedusting；On the one hand water system meets the spray water supply requirement of wet method pre-duster (5), on the other hand meet braised slag pool (33)
Water supply requirement；Solution regeneration cycle realizes the recycling of solution using system, while recycling profit can also be carried out to vapor
With.
2. dry-method dust-removal device according to claim 1, which is characterized in that flue gas dust collecting system, including smoke collecting cover
(1), the pre- dedusting gas inlet (4) of the first flue (2), the first gas fume valve (3), wet method, wet method pre-duster (5), wet
It is the pre- dedusting exhanst gas outlet (6) of method, the second flue (10), solution dehydrates device gas inlet (11), solution dehydrates device (12), molten
Solution dehydrator exhanst gas outlet (13), the second gas fume valve (16), third flue (17), nonaqueous dust cleaner gas inlet
(18), nonaqueous dust cleaner (19), nonaqueous dust cleaner exhanst gas outlet (20), unloading valve (21), the 4th flue (22), dedusting wind
Machine (23), the 5th flue (24), chimney (25), flue gas by-pass line (26), third gas fume valve (27)；
Smoke collecting cover (1), which is located above braised slag pool, collects aqueous flue dust, and exhanst gas outlet is connected with the first flue (2),
First flue (2) other end is connect with the first gas fume valve (3) air intake, the first gas fume valve (3) outlet air end and wet method
Pre- dedusting gas inlet (4) connection, the pre- dedusting exhanst gas outlet (6) of wet method connect with the second flue (10), the second fume pipe
Road (10) other end is connect with solution dehydrates device gas inlet (11), solution dehydrates device exhanst gas outlet (13) and the second gas fume valve
(16) air intake connects, and the second gas fume valve (16) outlet air end is connect with third flue (17), third flue (17)
The other end is connect with nonaqueous dust cleaner gas inlet (18), and nonaqueous dust cleaner exhanst gas outlet (20) connects with the 4th flue (22)
It connects, the 4th flue (22) other end is connect with the air inlet of dedusting fan (23), the air outlet of dedusting fan (23) and
Five flues (24) connect, and the 5th flue (24) other end is connect with the air inlet of chimney (25), flue gas by-pass line
(26) third gas fume valve (27) is housed, flue gas by-pass line (26) one end is picked out from the first flue (2), the other end on
It is accessed from third flue (17), unloading valve (21) is mounted at the lower part ash bucket ash hole of nonaqueous dust cleaner (19).
3. dry-method dust-removal device according to claim 1, which is characterized in that water system includes：Water inlet manifold (28),
One water inlet pipe (29), the first water inlet pipe valve (30), the second water inlet pipe (31), the second water inlet pipe valve (32)；Always
Water inlet pipe 28 is divided into the first water inlet pipe (29) and the second water inlet pipe (31), and the first water inlet pipe valve (30) is mounted on first
On water inlet pipe (29), first water inlet pipe valve (30) one end connects with the water inlet end along the first water inlet pipe of water (flow) direction (29)
It connects, the other end is connect with the pre- dedusting water inlet (9) of wet method, and the second water inlet pipe valve (32) is mounted on the second water inlet pipe (31)
On, second water inlet pipe valve (32) one end is connect with the water inlet end along the second water inlet pipe of water (flow) direction (31), and the other end connects
Connect the outlet conduit and water exit elbow of the second water inlet pipe (31).
4. dry-method dust-removal device according to claim 1, which is characterized in that sewage recovering system is by overflow pipe (34), row
Dirty valve (35), blow-off pipe (36), main sewer (37), solution regenerator branch drain (44), water seal (45)；Overflow pipe (34) one
End is connect with the pre- dedusting gap (8) of wet method, and the other end accesses on main sewer (37), and blowdown valve (35) one end is removed in advance with wet method
Dirt sewage draining exit (7) connects, and the other end is connect with the water inlet end along water (flow) direction blow-off pipe (36), the access of blow-off pipe (36) other end
On main sewer (37), solution regenerator branch drain (44) one end is connect with solution regenerator drain outlet (42), the other end
It is connect with the water inlet end of water seal (45), on the water outlet access main sewer (37) of water seal (45), main sewer (37) is located at stewing
Above the high-water line of slag bath (33).
5. dry-method dust-removal device according to claim 1, which is characterized in that solution regeneration cycle includes using system：It is dilute
The concentrated solution outlet of solution line (38), the dilute solution inlet (39) of solution regenerator, solution regenerator (40), solution regenerator
(41), concentrated solution pipeline (42)；Weak solution pipeline (38) one end is connect with the alkene taphole (15) of solution dehydrates device, the other end
It is connect with the dilute solution inlet (39) of solution regenerator, the concentrated solution import of concentrated solution pipeline (42) one end and solution dehydrates device
(14) it connects, concentrated solution outlet (41) connection of the other end and solution regenerator.
6. a kind of dust collecting process of dry-method dust-removal device according to claim 1-5 any one, which is characterized in that technique
Steps are as follows：
1) exhaust gas volumn generated within slag slag stewing initial stage, braised slag pool is larger, and moisture vapor is more in flue gas, at this point, the first cigarette
Air valve and the second gas fume valve are opened, and the third gas fume valve on flue gas bypass line is closed, and are contained by what fume trap cover was collected
Shredded tobacco for water pipes dirt is initially entered by flue in wet method pre-duster, water droplet, the moisture film of grit and sprinkling in one side flue gas
Or the processes such as the wetting, cohesion, sedimentation of grit can occur when meeting for wall, the device of wetting, separate, reach from gas
The purpose of pre- dedusting；Pre- efficiency of dust collection reaches 68-72%；On the other hand due to the cooling effect of water spray, part water in flue gas
Devaporation Cheng Shui can reduce the water separation capability of subsequent solution dehydrator；The sewage of wet method pre-duster lower part periodically passes through
Blowdown valve is discharged into braised slag pool slag stewing through main sewer and uses, and when blowdown valve does not work, wet method pre-duster shower water passes through under it
Overflow port at portion's high water level also flows into main sewer, flows back to braised slag pool；
2) from wet method pre-duster come out flue gas by flue enter back into solution dehydrates device dehydration, using solution with it is aqueous
There are larger steam partial pressure, concentrated solutions can absorb the vapor in flue gas rapidly, reach to humid flue gas for flue gas
Dehydration, moisture control meets the follow-up requirement for carrying out dry method dust within 5% in flue gas；
3) concentrated solution becomes weak solution after absorbing vapor, and weak solution enters solution regenerator after the outflow of solution dehydrates device, molten
Liquid regenerator is vacuum tank, and solution concentration improves to form concentrated solution after weak solution regeneration, then flow back into solution dehydrates device and inhale
The vapor for receiving humid flue gas is dehydrated, and is recycled；Vapor in regenerator accumulates in upper space, in cooling water
Cooling effect under, vapor condenses into water again, flows into main sewer by water seal by discharge outlet, flows back to braised slag pool, realize water
The recycling of resource；
4) it enters back into nonaqueous dust cleaner by flue through the dewatered flue gas of solution dehydrates device to be dusted, nonaqueous dust cleaner
Using conventional bag filter or sinter-plate precipitator, efficiency of dust collection reaches 99% or more, and dust emission index is complete to be reached≤
20mg/Nm3, nonaqueous dust cleaner dedusting ash is by the discharge of ash bucket lower part unloading valve；
5) exhaust gas volumn generated within the slag slag stewing later stage, braised slag pool is smaller, and moisture vapor is also less in flue gas, can become frequency modulation
Fast wind turbine low speed operation, at this point, the first gas fume valve and the second gas fume valve are closed, the third smoke valve on flue gas bypass line
Door is opened, and the flue dust collected by fume trap cover is directly entered nonaqueous dust cleaner by flue gas bypass line and is dusted；
6) air is discharged by chimney by dedusting fan by the clean gas after nonaqueous dust cleaner dedusting.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810759606.1A CN108671687B (en) | 2018-07-11 | 2018-07-11 | Dry dust removing device and process for steel slag water-containing smoke dust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810759606.1A CN108671687B (en) | 2018-07-11 | 2018-07-11 | Dry dust removing device and process for steel slag water-containing smoke dust |
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| CN108671687B CN108671687B (en) | 2023-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810759606.1A Active CN108671687B (en) | 2018-07-11 | 2018-07-11 | Dry dust removing device and process for steel slag water-containing smoke dust |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109248547A (en) * | 2018-10-21 | 2019-01-22 | 北京首钢国际工程技术有限公司 | A kind of drying device and its method for blast furnace water slag-flushing humid flue gas |
| CN110694399A (en) * | 2019-11-18 | 2020-01-17 | 陕西龙门钢铁有限责任公司 | Method and system for treating steel slag flue gas |
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| CN107525148A (en) * | 2017-09-07 | 2017-12-29 | 广州黄岩机电科技有限公司 | Solution dehumidification device and solution dehumidification method |
| CN107899408A (en) * | 2017-11-30 | 2018-04-13 | 南京师范大学 | A kind of wet method combines flue gas desulphurization system and sulfur method with dry method |
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| CN105238904A (en) * | 2015-09-04 | 2016-01-13 | 江苏博际喷雾系统有限公司 | Low-energy-consumption semidry-method dust removal system based on evaporative cooling for primary flue gas of converter |
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| CN109248547A (en) * | 2018-10-21 | 2019-01-22 | 北京首钢国际工程技术有限公司 | A kind of drying device and its method for blast furnace water slag-flushing humid flue gas |
| CN110694399A (en) * | 2019-11-18 | 2020-01-17 | 陕西龙门钢铁有限责任公司 | Method and system for treating steel slag flue gas |
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| CN108671687B (en) | 2023-07-04 |
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