CN108525485A - A kind of cock-oven gas purifying system and method for dust minimum discharge - Google Patents
A kind of cock-oven gas purifying system and method for dust minimum discharge Download PDFInfo
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- CN108525485A CN108525485A CN201810612797.9A CN201810612797A CN108525485A CN 108525485 A CN108525485 A CN 108525485A CN 201810612797 A CN201810612797 A CN 201810612797A CN 108525485 A CN108525485 A CN 108525485A
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- Prior art keywords
- coke oven
- flue gas
- cock
- gas purifying
- denitration
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- 239000000428 dust Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 56
- 239000003546 flue gas Substances 0.000 claims abstract description 108
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 107
- 239000000571 coke Substances 0.000 claims abstract description 102
- 239000007789 gas Substances 0.000 claims abstract description 49
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 44
- 230000023556 desulfurization Effects 0.000 claims abstract description 41
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 25
- 239000012716 precipitator Substances 0.000 claims abstract description 14
- 239000003595 mist Substances 0.000 claims description 29
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 28
- 229910021529 ammonia Inorganic materials 0.000 claims description 14
- 239000002918 waste heat Substances 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 6
- 230000003749 cleanliness Effects 0.000 abstract description 3
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 9
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 8
- 239000000908 ammonium hydroxide Substances 0.000 description 8
- 230000005684 electric field Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 235000019504 cigarettes Nutrition 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000000443 aerosol Substances 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 210000000481 breast Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Dispersion Chemistry (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides a kind of cock-oven gas purifying system and method for dust minimum discharge.The cock-oven gas purifying system may include：Denitrification apparatus receives coke oven flue gas from coke oven main chimney flue and carries out denitration process to coke oven flue gas；And desulphurization and dust removal integrated device, include the wet electrical dust precipitator for receiving the coke oven flue gas after denitration from denitrification apparatus and being carried out by the desulfurizing tower of desulfurization process and receives the coke oven flue gas after desulfurization from desulfurizing tower and is dusted to the coke oven flue gas after desulfurization for the coke oven flue gas after denitration.The cock-oven gas purifying system of exemplary embodiment according to the present invention can improve flue gas emission cleanliness factor, reduce chimney plume, reduce environmental pollution.
Description
Technical field
The present invention relates to coking technology fields, and in particular, to it is a kind of reduce coke oven flue gas desulphurization denitration after particle contain
Amount, the system and method for realizing minimum discharge.
Background technology
With the raising of environmental requirement, national urban executes special emission limit from June, 2018, it is desirable that in flue gas
SO2Content is 30mg/Nm3Below, NOxFor 150mg/Nm3Below, granular material discharged concentration is down to 15mg/m3。
Currently, domestic coke oven flue gas denitrating technique is mainly SCR techniques and oxidizing process technique, coke oven flue gas sulfur removal technology master
To be dry method, semidry method and wet method.Although prior art solves SO2With NOxEmission problem, but due to water mist, cigarette in flue gas
Dirt, heavy metal and particulate presence and cause removing ability limited, so as to cause chimney breast dustiness generally all
Higher than 50mg/Nm3, up to 100mg/Nm when high3, special emission limit requirement cannot be met.
Invention content
The purpose of the present invention is to provide a kind of cock-oven gas purifying system, which can effectively solve
Certainly coke oven flue gas is due to the exceeded problem of flue gas particles caused by grit, aerosol, salt after desulfurization etc., to realize
The minimum discharge of coking flue gas.
The purpose of the present invention is to provide a kind of cock-oven gas purifying systems of dust minimum discharge, make in coke oven flue gas
SO2Content, NOxContent, dust content can meet especially regional discharging standards simultaneously, that is, SO in flue gas2Content is 30mg/
Nm3Below, NOxFor 150mg/Nm3Below, dust content 15mg/Nm3Hereinafter, effectively reducing pollution.
The present invention provides a kind of cock-oven gas purifying system of dust minimum discharge, the cock-oven gas purifying system packet
It includes：Denitrification apparatus receives coke oven flue gas from coke oven main chimney flue and carries out denitration process to coke oven flue gas；And desulfurization and dedusting one
Makeup is set, and includes receiving the coke oven flue gas after denitration from denitrification apparatus and carrying out the de- of desulfurization process to the coke oven flue gas after denitration
Sulphur tower and the wet-esp for receiving the coke oven flue gas after desulfurization from desulfurizing tower and the coke oven flue gas after desulfurization being dusted
Device.
Exemplary embodiment according to the present invention, the desulphurization and dust removal integrated device can also include be located at desulfurizing tower with
Mist eliminator between wet electrical dust precipitator.
Exemplary embodiment according to the present invention, the denitrification apparatus may include ammonia supply department, be connected to ammonia supply department
Evaporator, be connected to the grid of evaporator and coke oven main chimney flue and be connected to the denitrating tower of grid.
Exemplary embodiment according to the present invention, the denitrification apparatus can also include the first air for being connected to evaporator
Heater and the ventilation blower for being connected to the first air heater, wherein the first air heater can be located at the coke after denitration
Kiln gas from denitrating tower discharge via path on.
Exemplary embodiment according to the present invention, the cock-oven gas purifying system can also include be located at denitrification apparatus with
Waste heat boiler between desulfurizing tower.
Exemplary embodiment according to the present invention, the cock-oven gas purifying system can also include being connected to waste heat boiler
Air-introduced machine between desulfurizing tower.
Exemplary embodiment according to the present invention, the cock-oven gas purifying system can also be connected to air-introduced machine and desulfurization
It the second air heater between tower and is connected to the second air heater and is arranged at the both sides of the second air heater
Hot standby wind turbine and chimney, the chimney is also connected to grid.
The present invention also provides a kind of cock-oven gas purifying method of dust minimum discharge, the cock-oven gas purifying method packets
It includes：Denitration process is carried out to the coke oven flue gas from coke oven main chimney flue；Desulfurization process is carried out to the coke oven flue gas after denitration；And
Wet-esp processing is carried out to the coke oven flue gas after desulfurization.
Exemplary embodiment according to the present invention, the cock-oven gas purifying method can also include：After to denitration
Coke oven flue gas carries out desulfurization process later and before carrying out wet-esp processing to the coke oven flue gas after desulfurization, to desulfurization
Coke oven flue gas afterwards carries out catching mist processing.
Exemplary embodiment according to the present invention, the cock-oven gas purifying method can also include：To coming from coke oven
The coke oven flue gas of main chimney flue carries out denitration process later and before carrying out desulfurization process to the coke oven flue gas after denitration, to de-
Coke oven flue gas after nitre carries out waste heat recovery.
During the cock-oven gas purifying system and method for dust minimum discharge according to the present invention have the following technical effect that
It is at least one：
(1) present invention can effectively solve the problem that flue gas particle caused by grit, aerosol, salt after coke oven flue gas desulfurization etc.
The exceeded problem of object, realizes the minimum discharge of coking flue gas；
(2) present invention increases mist eliminator between desulfurizing tower and wet electrical dust precipitator, is lowered into oil smoke in the flue gas of wet electricity
Content reduces influence of the oil smoke to wet operational effect；
(3) present invention passes through the SO after removing desulfurization3Acid mist and water mist effectively reduce the corrosivity of wet flue gas；
(4) present invention can improve flue gas emission cleanliness factor, reduce chimney plume, reduce environmental pollution.
Description of the drawings
By the way that below in conjunction with the accompanying drawings to the description of embodiment, these and/or other aspects will be apparent and be easier neck
Meeting, in the accompanying drawings：
Fig. 1 is showing for the cock-oven gas purifying system for the dust minimum discharge for showing exemplary embodiment according to the present invention
It is intended to.
Specific implementation mode
Now with reference to the attached drawing embodiment that the present invention is more fully described, the invention is shown in the accompanying drawings exemplary
Embodiment.However, the present invention can be embodied in many different forms, and it should not be construed as being limited to implementation set forth herein
Example；On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and these embodiments will be to this field
Those of ordinary skill fully communicates the design of the embodiment of the present invention.In addition, various exemplary embodiments can be different, but not
Must be exclusive.For example, in the case where not departing from disclosed spirit and scope, it can be in another exemplary embodiment
Implement specific shape, construction and the characteristic of exemplary embodiment.
When differently exemplary embodiment can be implemented, it may be used and executed with described order different
Specific process sequence.For example, can be performed simultaneously substantially or execute two companies with the sequence opposite with described sequence
The technique of continuous description.In addition, same reference numeral indicates same element.
In order to reduce the dust emission in coke oven flue gas, in cock-oven gas purifying system according to the present invention, coke oven cigarette
Gas enters desulphurization and dust removal integrated device after denitration, is removed when the wet flue gas with fine particle, water mist drop enters wet type electricity
After the electric field of dirt device, by high-voltage corona discharge make dust charged, be charged after dust reach dust under the action of electric field force
Pipe, then by the way of periodic flushing, makes dust be removed with the flowing for washing away liquid.Wash away liquid company of being formed on dust leg
The dust of capture is washed into ash bucket and is discharged with liquid is washed away by continuous moisture film.It will be described in detail below according to the present invention
The cock-oven gas purifying system of the dust minimum discharge of exemplary embodiment.
Fig. 1 is showing for the cock-oven gas purifying system for the dust minimum discharge for showing exemplary embodiment according to the present invention
It is intended to.
As shown in fig. 1, the cock-oven gas purifying system of the dust minimum discharge of exemplary embodiment according to the present invention
100 may include receiving coke oven flue gas from coke oven main chimney flue and carrying out the denitrification apparatus 110 of denitration process and right to coke oven flue gas
Coke oven flue gas after denitration carries out the desulphurization and dust removal integrated device 120 of desulfurization process and dust removal process.
In an exemplary embodiment in accordance with the present invention, denitrification apparatus 110 may include ammonia supply department 115, be connected to ammonia
The evaporator 111 of supply department 115, the grid 112 for being connected to evaporator 111 and coke oven main chimney flue and it is connected to grid 112
Denitrating tower 113.Here, ammonia supply department 115 can the nozzle of ammonium hydroxide be sprayed to evaporator 111, however the present invention's is exemplary
Embodiment is without being limited thereto.
In an exemplary embodiment of the present invention, in order to make by ammonia supply department 115 be supplied to evaporator 111 ammonium hydroxide turn
It is changed to ammonia, denitrification apparatus 110 can also include being connected to the first air heater 116 of evaporator 111 and being connected to the
The ventilation blower 114 of one air heater 116；However, exemplary embodiment of the present invention is without being limited thereto.
In addition, in order to make full use of the heat of coke oven flue gas, the first air heater 116 that can be located at the coke oven after denitration
Flue gas from the discharge of denitrating tower 113 institute via path on, to be entered in the first air heater 116 by ventilation blower 114
Air with from denitrating tower 113 be discharged denitration after coke oven flue gas carry out heat exchange.
In the present invention, ammonium hydroxide enters evaporator 111 via ammonia supply department 115, and is entered by ventilation blower 114
The air of first air heater 116 is heated to flow to evaporator 111 to be heated to the ammonium hydroxide in evaporator 111, later ammonia
Into grid 112；The coke oven flue gas come from coke oven main chimney flue enters grid 112, and is mixed with the ammonia for carrying out flash-pot 111
Into denitrating tower 113, to carry out denitration process to coke oven flue gas in denitrating tower 113.In addition, coke oven flue gas after denitration with
Air in first air heater 116 carries out heat exchange, and cycle heats ammonium hydroxide, to improve the recuperation of heat of coke oven flue gas
Rate.
Desulphurization and dust removal integrated device 120 may include receiving denitration from denitrification apparatus 110 (specifically, denitrating tower 113)
Rear coke oven flue gas simultaneously carries out the desulfurizing tower 121 of desulfurization process to the coke oven flue gas after denitration and is received from desulfurizing tower 121 de-
Coke oven flue gas after sulphur and the wet electrical dust precipitator 123 that the coke oven flue gas after desulfurization is dusted.
Desulfurizing tower 121 can be desulfurizing tower commonly used in the art, and concrete structure is unrestricted.
Wet electrical dust precipitator 123 can have the structure using dust leg made of nonconducting nonmetallic materials.Wet type
Electric precipitator 123 can generate electric field, when the wet flue gas with fine particle, water mist drop enters wet type electricity by mist eliminator 122
After the electric field of deduster 123, by high-voltage corona discharge make dust charged, be charged after dust reached under the action of electric field force
Dust leg (not shown) makes dust be removed with the flowing for washing away liquid then by the way of periodic flushing.Liquid is washed away to collect
Continuous moisture film is formed on dirt pipe, by the dust of capture be washed into ash bucket with wash away liquid discharge.Flue gas after dedusting is through top
Chimney is in line.
In an exemplary embodiment of the present invention, desulphurization and dust removal integrated device 120 can also include being located at desulfurizing tower 121
Mist eliminator 122 between wet electrical dust precipitator 123.By the coke oven flue gas after 121 desulfurization of desulfurizing tower after mist eliminator 122
Into wet electrical dust precipitator 123.The mist eliminator 122 being arranged between desulfurizing tower 121 and wet electrical dust precipitator 123 can trap cigarette
Tar cigarette in gas is lowered into oil smoke content in the flue gas of wet electrical dust precipitator 123, reduces shadow of the oil smoke to wet operational effect
It rings.In addition, mist eliminator 122 can also remove the SO after desulfurization3Acid mist and water mist effectively reduce the corrosivity of wet flue gas.
As shown in fig. 1, waste heat pot can also be set between denitrification apparatus 110 and desulphurization and dust removal integrated device 120
Stove 130.According to example embodiment of the present invention, the coke oven flue gas after denitration enters waste heat boiler 130, by recycling coke oven
The waste heat of flue gas produces the steam of certain pressure and temperature.Cock-oven gas purifying system 100 can also include being connected to waste heat
Air-introduced machine 140 between boiler 130 and desulfurizing tower 121 and the second air heater 152, by the coke oven flue gas after waste heat recovery
It is introduced into desulfurizing tower 121 after the second air heater 152 further cooling.
In this exemplary embodiment, cock-oven gas purifying system 100 can also include bypass smoke discharging device 150.
Bypass smoke discharging device 150 may include being connected to grid 112 (for example, being connected to connection grid 112 and denitration
The pipeline of tower 121) chimney 151.When cock-oven gas purifying system 100 breaks down, start bypass smoke discharging device
150, that is, coke oven flue gas will directly be discharged from chimney 151 before denitration.In addition, bypass smoke discharging device 150 can also wrap
It includes the second air heater 152 for being connected to chimney 151 and is connected to the second air heater 152 and adds positioned at the second air
Hot standby wind turbine 153 at the side (for example, downside) of hot device 152.The hot standby purpose of chimney is to provide suction to coke oven heating system
Power.
In addition, the cock-oven gas purifying system 100 of the dust minimum discharge of exemplary embodiment of the present invention is in addition to including
Can also include some connecting elements of connecting pipe, valve, temperature-detecting device etc. except above-mentioned main device.
The cock-oven gas purifying system 100 of the dust minimum discharge of exemplary embodiment according to the present invention is described below
Purification method.
The purification method of the cock-oven gas purifying system 100 of the dust minimum discharge of exemplary embodiment according to the present invention
Including：Denitration process is carried out to the coke oven flue gas from coke oven main chimney flue；Desulfurization process is carried out to the coke oven flue gas after denitration；It is right
Coke oven flue gas after desulfurization carries out wet-esp processing.
First, denitration process is carried out to the coke oven flue gas from coke oven main chimney flue, specifically, ammonium hydroxide is through ammonia supply department 115
Into in evaporator 111, ammonium hydroxide evaporates in evaporator 111 and enters grid 112 after being mixed with air；Come from coke oven main chimney flue
Coke oven flue gas through grid 112 and carry out the ammonia of flash-pot 111 and be mixed into denitrating tower 113, to coming from denitrating tower 113
The coke oven flue gas of coke oven main chimney flue carries out denitration process.
In addition, the air from ventilation blower 114 enters steaming with after the coke oven flue gas of the discharge of denitrating tower 113 is exchanged heat
Device 111 is sent out, makes ammonium hydroxide evaporation in evaporator 111, to improve the heat recovery rate of coke oven flue gas.
In an exemplary embodiment of the present invention, to from coke oven main chimney flue coke oven flue gas carry out denitration process it
Afterwards, waste heat recovery is carried out to the coke oven flue gas after denitration.In particular, the flue gas after denitration enters waste heat boiler 130, by returning
The waste heat of flue gas is received to produce the steam of certain pressure and temperature.
Then, the coke oven flue gas after denitration is carried out in desulfurization process, desulfurization is carried out to coke oven flue gas using desulfurizing tower 121
Processing.Specifically, the flue gas after waste heat recovery can enter desulfurization and dedusting one through air-introduced machine 140 and the second air heater 152
The desulfurizing tower 121 in 120 is set in body makeup, to carry out desulfurization process to coke oven flue gas.
In an exemplary embodiment of the present invention, after carrying out desulfurization process to coke oven flue gas, to the coke oven after desulfurization
Flue gas carries out catching mist processing.Specifically, mist eliminator 122 can be entered by the coke oven flue gas after 121 desulfurization of desulfurizing tower, with right
Coke oven flue gas after desulfurization carries out catching mist processing.Mist eliminator 122 can trap the tar cigarette in flue gas, be lowered into wet type electricity and remove
Oil smoke content in the flue gas of dirt device 123 reduces influence of the oil smoke to wet electric precipitation operational effect.In addition, mist eliminator 122 can be with
Remove the SO after desulfurization3Acid mist and water mist effectively reduce the corrosivity of wet flue gas.
Then, wet-esp processing is carried out to the coke oven flue gas after desulfurization.Specifically, it is caught by mist eliminator 122
The flue gas of mist processing can enter the wet electrical dust precipitator 123 that can generate electric field.When the wet cigarette with fine particle, water mist drop
Gas makes dust charged, after charged after mist eliminator 122 enters the electric field of wet electrical dust precipitator 123 by high-voltage corona discharge
Dust dust leg is reached under the action of electric field force, then by the way of periodic flushing, make dust with the stream for washing away liquid
It moves and removes.Wash away liquid and form continuous moisture film on dust leg, by the dust of capture be washed into ash bucket with wash away liquid discharge.
Finally, the flue gas after dedusting is in line through top chimney.
Therefore, the cock-oven gas purifying system and method energy of the dust minimum discharge of exemplary embodiment according to the present invention
It is enough effectively to solve the problems, such as flue dust, water mist and aerosol after coke oven flue gas denitration desulfurization, it can not only greatly improve flue gas
Cleanliness factor is discharged, reduces chimney plume, and the corrosivity of wet flue gas can be greatly reduced, mitigates the corrosion of chimney.
Although the present invention, those skilled in the art are specifically illustrated and described with reference to exemplary embodiment of the present invention
It should be understood that without departing from the spirit and scope of the present invention, the various changes in formal and details can be made.
Claims (10)
1. a kind of cock-oven gas purifying system of dust minimum discharge, the cock-oven gas purifying system include：
Denitrification apparatus receives coke oven flue gas from coke oven main chimney flue and carries out denitration process to coke oven flue gas；And
Desulphurization and dust removal integrated device includes from the coke oven flue gas after denitrification apparatus reception denitration and to the coke oven flue gas after denitration
It carries out the desulfurizing tower of desulfurization process and receives the coke oven flue gas after desulfurization from desulfurizing tower and the coke oven flue gas after desulfurization is carried out
The wet electrical dust precipitator of dedusting.
2. cock-oven gas purifying system according to claim 1, wherein the desulphurization and dust removal integrated device further includes position
Mist eliminator between desulfurizing tower and wet electrical dust precipitator.
3. cock-oven gas purifying system according to claim 1, wherein the denitrification apparatus includes ammonia supply department, connection
To ammonia supply department evaporator, be connected to the grid of evaporator and coke oven main chimney flue and be connected to the denitrating tower of grid.
4. cock-oven gas purifying system according to claim 3, wherein the denitrification apparatus further includes being connected to evaporator
The first air heater and be connected to the ventilation blower of the first air heater,
Wherein, the first air heater be located at the coke oven flue gas after denitration from denitrating tower discharge via path on.
5. cock-oven gas purifying system according to claim 1, the cock-oven gas purifying system further includes being located at denitration
Waste heat boiler between device and desulfurizing tower.
6. cock-oven gas purifying system according to claim 5, the cock-oven gas purifying system further include be connected to it is remaining
Air-introduced machine between heat boiler and desulfurizing tower.
7. cock-oven gas purifying system according to claim 6, the cock-oven gas purifying system further includes being connected to draw
It the second air heater between wind turbine and desulfurizing tower and is connected to the second air heater and is arranged and heated in the second air
Hot standby wind turbine at the both sides of device and chimney, the chimney are also connected to grid.
8. a kind of cock-oven gas purifying method of dust minimum discharge, the cock-oven gas purifying method include：
Denitration process is carried out to the coke oven flue gas from coke oven main chimney flue；
Desulfurization process is carried out to the coke oven flue gas after denitration；
Wet-esp processing is carried out to the coke oven flue gas after desulfurization.
9. cock-oven gas purifying method according to claim 8, the cock-oven gas purifying method further include：To denitration
Coke oven flue gas afterwards carries out desulfurization process later and before carrying out wet-esp processing to the coke oven flue gas after desulfurization, right
Coke oven flue gas after desulfurization carries out catching mist processing.
10. cock-oven gas purifying method according to claim 8, the cock-oven gas purifying method further include：To coming
From the coke oven flue gas of coke oven main chimney flue carry out denitration process after and to the coke oven flue gas after denitration carry out desulfurization process it
Before, waste heat recovery is carried out to the coke oven flue gas after denitration.
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