CN108187489A - A kind of coke oven desulphurization denitration dust removal integrated plant - Google Patents
A kind of coke oven desulphurization denitration dust removal integrated plant Download PDFInfo
- Publication number
- CN108187489A CN108187489A CN201810062772.6A CN201810062772A CN108187489A CN 108187489 A CN108187489 A CN 108187489A CN 201810062772 A CN201810062772 A CN 201810062772A CN 108187489 A CN108187489 A CN 108187489A
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- flue gas
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- coke oven
- outlet
- dust removal
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- 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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
-
- 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
Abstract
The invention discloses a kind of coke oven desulphurization denitration dust removal integrated plants, it is related to fume treatment technical field, including sequentially connected flue gas system, desulphurization system, dust pelletizing system and denitrating system, the outlet of the denitrating system is connect by air-introduced machine with chimney, further include flue gas reheat system and heating flue gas device, the outlet of the heating flue gas device is connect with the denitrating system, the entrance outlet with the flue gas reheat system respectively of the heating flue gas device, the outlet connection of the dust pelletizing system, the entrance of the flue gas reheat system is connect with the outlet of the air-introduced machine.The present invention is suitable for the improvement of coke oven flue gas, has many advantages, such as that pollution is small, purification is thorough, at low cost, service life is long.
Description
Technical field
The present invention relates to fume treatment technical fields, and in particular to a kind of coke oven desulphurization denitration dust removal integrated plant.
Background technology
Coking is to cooperate various feed coals according to a certain percentage, it is heated to 950 under conditions of air is completely cut off~
1050 DEG C, mixed coal ultimately forms the process of coke by drying, melting, cracking, polycondensation, Semicoke Contraction.Coke is most traditional
Coalification chemical product, be made by coking process, be a kind of quality it is hard, in silver-gray blocky carbonaceous material, can not only be used for also
Former agent, the energy and the agent of confession charcoal can also be applied to for blast furnace ironmaking, cupola furnace casting, ferroalloy smelting and non-ferrous metal metallurgy
The fields such as calcium carbide production, gasification and synthesis chemistry.Coking industry is a kind of heavy polluted industry, and technological process is complicated, production process
The high pollution substance of middle generation is more, and the exhaust emission generated in process of coking includes SO2、NH3, nitrogen oxides and dust etc.,
It is more serious to atmosphere pollution.
On the whole, coke oven flue gas has the characteristics that：
1st, coke oven flue gas temperature range is essentially 180~300 DEG C, and temperature fluctuation range is larger；
2nd, coke oven flue gas complicated component, NOx content is higher, and concentration is generally 350~1200mg/Nm3；
3rd, contain SO in coke oven flue gas2, in 180 DEG C~230 DEG C temperature ranges, SO2It is easily reacted with ammonia and is converted into sulfuric acid
Ammonium causes line clogging and equipment to corrode；
4th, coke oven chimney must be in hot standby state always, and after desulphurization denitration dedusting, last exhaust temperature needs flue gas
Ensure at 130 DEG C or so.
With reference to more than feature, wet method limestone-gypsum sulfur removal technology, the selective catalytic reduction being widely used at present take off
The improvement of nitre technique (SCR) and inapplicable coke oven flue gas, conventional dry desulfurization deposit the shortcomings that dust content is big after the reaction.
In recent years, with the getting worse of atmosphere pollution, for people to the pay attention to day by day of atmosphere protection, country and place are environmentally friendly
The requirement that department carries coking industry coke oven flue gas mark transformation is increasingly urgent, and coking industry must actively carry out desulphurization denitration and remove
The advanced technologies measure of dirt, to eliminate environmental risk that discharge beyond standards bring and reach national environmental controlled index.
Invention content
Present invention aims at the above-mentioned technical problems in the prior art are solved, a kind of coke oven desulphurization denitration is provided and is removed
Dirt integrated apparatus suitable for the improvement of coke oven flue gas, has and pollutes that small, purification is thorough, at low cost, service life length etc. is excellent
Point.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that：
A kind of coke oven desulphurization denitration dust removal integrated plant, including sequentially connected flue gas system, desulphurization system, dedusting system
System and denitrating system, the outlet of the denitrating system are connect by air-introduced machine with chimney, are further included flue gas reheat system and are added
Heat smoke device, the outlet of the heating flue gas device are connect with the denitrating system, the entrance point of the heating flue gas device
Not with the exporting of the flue gas reheat system, the outlet of the dust pelletizing system is connect, the entrance of the flue gas reheat system and institute
State the outlet connection of air-introduced machine.
Preferably, the flue gas reheat system includes hot-blast stove, the entrance of the hot-blast stove by return air fan with it is described
The outlet connection of air-introduced machine, the outlet of the hot-blast stove are connect with the heating flue gas device, and combustion is additionally provided in the hot-blast stove
Burner, the fuel of the burner is blast furnace gas.
Preferably, the burner is low NO, and the low NO is connect with blast furnace gas, the low nitrogen combustion
Combustion fan is also associated in burner.
Preferably, the desulphurization system includes desulfurizing tower and the spraying system being set to before the desulfurizing tower entrance, institute
It states spraying system and includes injection apparatus and the apparatus for preparing desulphurizing agent being connect with the injection apparatus, the injection apparatus setting
In the flue being connect in the flue gas system with the desulphurization system.
Preferably, the injection apparatus includes at least three playpipes being set in the flue, and the playpipe hangs down
Directly in being evenly distributed with spray-hole on flow of flue gas direction, the playpipe.
Preferably, the desulfurizing tower includes being set to the smoke distributor of the desulfurizing tower inlet and be set to described
Static mixer above smoke distributor, the desulfurizing tower outlet are set to the top of the static mixer, the flue gas
The inlet diameter of distributor is less than the outlet diameter of the smoke distributor, and the static mixer is vertically set
Cylindrical structure, the outlet diameter of the smoke distributor are matched with the inner diameter of the static mixer.
Preferably, guide vane is also distributed in the smoke distributor.
Preferably, the denitrating system includes SCR reactors and the spray ammonia lattice being set at the SCR reactor inlets
Grid, the heating flue gas device are connect with the SCR reactors, and the ammonia-spraying grid is set to the heating flue gas device and institute
On the flue for stating the connection of SCR reactors, the ammonia-spraying grid is connect with ammonia preparation facilities.
Preferably, by the way that wind and smoke road is taken to be connect with the desulphurization system, described take also sets the flue gas system on wind and smoke road
Windshield plate door is taken, the air-introduced machine is connect by air return flues with the chimney, and return air gear is additionally provided on the air return flues
Plate door, described take are also associated with bypass flue between wind and smoke road and the air return flues, one end of the bypass flue is set to
The front end for taking windshield plate door, the other end of the bypass flue are set to the rear end of the return air baffle door, the bypass
By-pass damper door is additionally provided on flue.
Preferably, the dust pelletizing system is bag filter.
The present invention is by adopting the above-described technical solution, have the advantages that：
(1) it is absorbed in present invention process and product processing carries out under dry state, no sewage spent acid discharge, equipment corrosion journey
Degree is lighter；
(2) flue gas in whole device without smoke temperature after significant hypothermal, purification it is high, spread conducive to chimney emission；
(3) after desulfurization, SO in flue gas2Concentration reduces, and it is miscellaneous to reduce ammonium sulfate during denitration reaction, ammonium hydrogen sulfate
The formation of matter protects the activity of denitrating catalyst, prolongs the service life；
(4) flue gas reheat system improves denitration flue-gas temperature, is carried out conducive to reaction；
(5) flue gas reheat system has catalyst pyrolysis regeneration function concurrently, improves the utilization rate of catalyst, reduces into
This.
Description of the drawings
Attached drawing is used for providing the preferred understanding to the present invention, and a part for constitution instruction, the reality with the present invention
Example is applied together for explaining the present invention, is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is a kind of system construction drawing of coke oven desulphurization denitration dust removal integrated plant of the present invention；
Fig. 2 is the structure diagram in inventive desulfurization tower.
In figure label for：1st, flue gas system；2nd, desulphurization system；2-1, desulfurizing tower；2-2, spraying system；2-3, injection dress
It puts；2-4, apparatus for preparing desulphurizing agent；2-5, smoke distributor；2-6, static mixer；3rd, dust pelletizing system；4th, denitrating system；4-
1st, SCR reactors；4-2, ammonia-spraying grid；4-3, ammonia preparation facilities；5th, air-introduced machine；6th, chimney；7th, flue gas reheat system；7-1、
Hot-blast stove；7-2, return air fan；7-3, burner；7-4, combustion fan；7-5, blast furnace gas；8th, flue gas device is heated；9th, it takes
Windshield plate door；10th, return air baffle door；11st, by-pass damper door.
Specific embodiment
The optimal embodiment that the invention will now be described in detail with reference to the accompanying drawings.
As shown in Figure 1 to Figure 2, a kind of coke oven desulphurization denitration dust removal integrated plant for the present invention, including being sequentially connected
Flue gas system 1, desulphurization system 2, dust pelletizing system 3 and denitrating system 4, the outlet of denitrating system 4 passes through air-introduced machine 5 and chimney 6
Connection further includes flue gas reheat system 7 and heating flue gas device 8, and the outlet of heating flue gas device 8 is connect with denitrating system 4,
The entrance of heating flue gas device 8 is connect respectively with the outlet of flue gas reheat system 7, the outlet of dust pelletizing system 3, flue gas reheat system
7 entrance is connect with the outlet of air-introduced machine 5.
Flue gas reheat system 7 includes hot-blast stove 7-1, and the entrance of hot-blast stove 7-1 passes through return air fan 7-2 and air-introduced machine 5
Outlet connection, the outlet of hot-blast stove 7-1 are connect with heating flue gas device 8, and burner 7-3, burner are additionally provided in hot-blast stove 7-1
The fuel of 7-3 is blast furnace gas.
Burner 7-3 is low NO, and low NO connect with blast furnace gas 7-5, is also connected on low NO
There is combustion fan 7-4.
Desulphurization system 2 includes the desulfurizing tower 2-1 and spraying system 2-2 being set to before desulfurizing tower 2-1 entrances, spraying system
2-2 includes injection apparatus 2-3 and the apparatus for preparing desulphurizing agent 2-4 being connect with injection apparatus 2-3, injection apparatus 2-3 are set to
In the flue that flue gas system 1 is connect with desulphurization system 2.
Injection apparatus 2-3 includes at least three and is set to playpipes in flue, playpipe perpendicular to flow of flue gas direction,
Spray-hole is evenly distributed on playpipe.
Desulfurizing tower 2-1 includes being set to the smoke distributor 2-5 of desulfurizing tower 2-1 inlet and is set to smoke distributor
Static mixer 2-6 above 2-5, desulfurizing tower 2-1 export the top for being set to static mixer 2-6, smoke distributor 2-5's
Inlet diameter is less than the outlet diameter of smoke distributor 2-5, and static mixer 2-6 is the cylindrical knot vertically set
Structure, the outlet diameter of smoke distributor 2-5 are matched with the inner diameter of static mixer 2-6.
Guide vane is also distributed in smoke distributor 2-5.
Denitrating system 4 includes the SCR reactors 4-1 and ammonia-spraying grid 4-2 for being set to SCR reactor 4-1 inlet, adds
Heat smoke device 8 is connect with SCR reactors 4-1, and ammonia-spraying grid 4-2 is set to heating flue gas device 8 and connects with SCR reactors 4-1
On the flue connect, ammonia-spraying grid 4-2 is connect with ammonia preparation facilities 4-3.
Flue gas system 1 takes to be additionally provided on wind and smoke road and takes windshield plate door 9, air inducing by the way that wind and smoke road is taken to be connect with desulphurization system 2
Machine 5 is connect by air return flues with chimney 6, and return air baffle door 10 is additionally provided on air return flues, take wind and smoke road and air return flues it
Between be also associated with bypass flue, one end of bypass flue is set to the front end for taking windshield plate door 9, the other end setting of bypass flue
In the rear end of return air baffle door 10, by-pass damper door 11 is additionally provided on bypass flue.
Dust pelletizing system 3 is bag filter.
The operation principle of the present invention：
Coke oven flue gas introduces dry method desulfuration system 2 by flue gas system 1, and spraying system 2-2, flue gas are equipped in desulfurizing tower 2-1
Distributor 2-5, static mixer 2-6, injection apparatus 2-3 select carbon steel material, and inner liner polytetrafluoroethylene material reduces resistance；
Desulfurizing agent (NaHCO3) by flue before injection apparatus 2-3 penetrating desulfurizing towers 2-1, with flue gas after mixing, pass through from tower lower part
Smoke distributor 2-5 enters after being uniformly distributed in the static mixer 2-6 of desulfurizing tower 2-1, is fully reacted in desulfurizing tower 2-1,
Bulky grain flue dust is affected by gravity in desulfurizing tower 2-1 and loses kinetic energy, falls after rise to desulfurizing tower 2-1 entry bottoms, passes through ash removing opening
It will be arranged outside this part dust particles；
Coke oven flue gas exports from desulfurizing tower 2-1 and introduces dust pelletizing system 3, removes the dust particles in flue gas；
For coke oven flue gas after desulfurization and dedusting, flue-gas temperature is down to 160 DEG C or so, in order to improve the work of denitrating catalyst
Temperature improves denitration efficiency and ensures the operation steady in a long-term of denitrating catalyst, needs to improve the temperature of coke oven flue exhaust gas
To 200 DEG C or so, flue gas reheat system 7 will be after the part purification after desulfurization and dedusting denitrating system air-introduced machine 5 with hot-blast stove 7-1
It is sent after flue gas to heating flue gas device 8, the coke oven flue exhaust gas after 3 dedusting of dust pelletizing system is heated to by flue gas after heating
200 DEG C or so, denitration reaction is carried out subsequently into denitrating system 4, wherein, the fuel of hot-blast stove 7-1 is blast furnace gas 7-5.
The coke oven flue gas of processing by flue gas reheat system 7 enters SCR reactor 4-1, and ammonia-spraying grid 4-2 sprays into flue
Interior NH3Generation N is reacted under the action of low temperature catalyst with the NOx in flue gas2And H2O；Finally, denitration outlet clean flue gas
Chimney 6 is led to by air-introduced machine 5 to discharge.
Flue gas reheat system 7 is pyrolyzed function as unit catalyst, and when catalyst is pyrolyzed, hot-blast stove 7-1 is by SCR reactors
Catalyst in 4-1 is heated to 320 DEG C~350 DEG C, and online pyrolysis regeneration, removal are carried out to the catalyst in SCR reactors 4-1
The hydrogen sulfate ammonia that catalyst surface bonds.
When catalyst needs pyrolysis, open by-pass damper door 11, make untreated flue gas directly through by-pass damper door 11 to
Chimney 6 discharges, entire desulphurization denitration dust pelletizing system short circuit；Increase the exhaust gas volumn of hot-blast stove 7-1, flow through SCR reactors 4-1's
Flue-gas temperature increases, and reaches catalyst pyrolysis required temperature, this partial fume is exported from air-introduced machine 5 to be led back again to hot-blast stove 7-1,
Hot-blast stove-SCR reactors-air-introduced machine forms sealing and circulating；Shorter, about 8h/ the time required to the catalyst pyrolysis of the present invention.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although with reference to aforementioned reality
Example is applied the present invention is described in detail, it for those skilled in the art, still can be to previous embodiment
Recorded technical solution modifies or carries out equivalent replacement to which part technical characteristic.All spirit in the present invention
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of coke oven desulphurization denitration dust removal integrated plant, including sequentially connected flue gas system, desulphurization system, dust pelletizing system
And denitrating system, the outlet of the denitrating system are connect by air-introduced machine with chimney, which is characterized in that further include flue gas reheat system
System and heating flue gas device, the outlet of the heating flue gas device are connect with the denitrating system, the heating flue gas device
Entrance respectively with the exporting of the flue gas reheat system, the outlet of the dust pelletizing system is connect, the flue gas reheat system
Entrance is connect with the outlet of the air-introduced machine.
2. a kind of coke oven desulphurization denitration dust removal integrated plant according to claim 1, which is characterized in that the flue gas is again
Hot systems include hot-blast stove, and the entrance of the hot-blast stove is connect by return air fan with the outlet of the air-introduced machine, the hot wind
The outlet of stove is connect with the heating flue gas device, burner is additionally provided in the hot-blast stove, the fuel of the burner is height
Producer gas.
A kind of 3. coke oven desulphurization denitration dust removal integrated plant according to claim 2, which is characterized in that the burner
For low NO, the low NO is connect with blast furnace gas, and combustion fan is also associated on the low NO.
A kind of 4. coke oven desulphurization denitration dust removal integrated plant according to claim 1, which is characterized in that the desulfurization system
System includes desulfurizing tower and the spraying system being set to before the desulfurizing tower entrance, the spraying system including injection apparatus and
The apparatus for preparing desulphurizing agent being connect with the injection apparatus, the injection apparatus are set to the flue gas system and the desulfurization system
It unites in the flue of connection.
A kind of 5. coke oven desulphurization denitration dust removal integrated plant according to claim 4, which is characterized in that the injection dress
It puts and is set to playpipe in the flue including at least three, the playpipe is perpendicular to flow of flue gas direction, the injection
Spray-hole is evenly distributed on pipe.
A kind of 6. coke oven desulphurization denitration dust removal integrated plant according to claim 4, which is characterized in that the desulfurizing tower
Including the static mixing for being set to the smoke distributor of the desulfurizing tower inlet and being set to above the smoke distributor
Device, the desulfurizing tower outlet are set to the top of the static mixer, and the inlet diameter of the smoke distributor is less than described
The outlet diameter of smoke distributor, the static mixer are the cylindrical structure vertically set, the flue gas distribution
The outlet diameter of device is matched with the inner diameter of the static mixer.
A kind of 7. coke oven desulphurization denitration dust removal integrated plant according to claim 6, which is characterized in that the flue gas point
Guide vane is also distributed in orchestration.
A kind of 8. coke oven desulphurization denitration dust removal integrated plant according to claim 1, which is characterized in that the denitration system
System includes SCR reactors and the ammonia-spraying grid being set at the SCR reactor inlets, it is described heat flue gas device with it is described
SCR reactors connect, and the ammonia-spraying grid is set on the flue that the heating flue gas device is connect with the SCR reactors,
The ammonia-spraying grid is connect with ammonia preparation facilities.
A kind of 9. coke oven desulphurization denitration dust removal integrated plant according to claim 1, which is characterized in that the flue gas system
System by the way that wind and smoke road is taken to be connect with the desulphurization system, it is described take to be additionally provided on wind and smoke road take windshield plate door, the air-introduced machine leads to
It crosses air return flues to connect with the chimney, return air baffle door is additionally provided on the air return flues, it is described to take wind and smoke road and described go back to
Bypass flue is also associated between wind and smoke road, one end of the bypass flue is set to the front end for taking windshield plate door, described
The other end of bypass flue is set to the rear end of the return air baffle door, and by-pass damper door is additionally provided on the bypass flue.
A kind of 10. coke oven desulphurization denitration dust removal integrated plant according to claim 1, which is characterized in that the dedusting
System is bag filter.
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| CN201810062772.6A CN108187489A (en) | 2018-01-23 | 2018-01-23 | A kind of coke oven desulphurization denitration dust removal integrated plant |
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| CN109316952A (en) * | 2018-10-11 | 2019-02-12 | 浙江浙能催化剂技术有限公司 | A kind of the flue gas minimum discharge equipment and technique of non-electrical domain |
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| CN112044267A (en) * | 2019-06-05 | 2020-12-08 | 中冶长天国际工程有限责任公司 | Method and system for utilizing heat energy of clean flue gas in flue gas treatment |
| CN112044267B (en) * | 2019-06-05 | 2022-08-16 | 中冶长天国际工程有限责任公司 | Method and system for utilizing heat energy of clean flue gas in flue gas treatment |
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| CN115245737B (en) * | 2021-04-25 | 2024-02-02 | 湖南天桥环境科技有限公司 | Flue gas SCR denitrification facility and flue gas processing system |
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Application publication date: 20180622 |