CN108579360A - A kind of coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN couples method of denitration and device with SNCR/SCR - Google Patents
A kind of coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN couples method of denitration and device with SNCR/SCR Download PDFInfo
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- CN108579360A CN108579360A CN201810495274.0A CN201810495274A CN108579360A CN 108579360 A CN108579360 A CN 108579360A CN 201810495274 A CN201810495274 A CN 201810495274A CN 108579360 A CN108579360 A CN 108579360A
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- denitration
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- vesidual heat
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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
- B01D53/46—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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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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
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- 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
-
- 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
Abstract
The present invention is that a kind of coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN couples method of denitration and device with SNCR/SCR, couple with SNCR that method of denitration, UTILIZATION OF VESIDUAL HEAT IN couple method of denitration and SNCR denitration and SCR denitration coupling process with SCR and coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN couples denitrification apparatus with SNCR/SCR including UTILIZATION OF VESIDUAL HEAT IN.Select suitable temperature region as spray ammonia space in regenerative chamber, by spray gun ammonia is sprayed into spray ammonia space, carry out SNCR denitration reaction, suitable temperature region is selected below spray ammonia space, SCR catalyst is arranged in the temperature region, so that remaining ammonia is carried out SCR denitration with the nitrogen oxides in flue gas and is reacted.Fume afterheat is utilized and is coupled with denitration technology by the present invention, and process structure is simple, changes checker brick and is relatively easy to, the equipment such as SCR denitrating flue gas towers need not be purchased, compared to traditional SCR denitration system, energy consumption and operation cost of investment are reduced so that denitration efficiency significantly improves.
Description
Technical field
The present invention relates to waste heat of coke-oven flue gas utilize with denitration field, particularly relate to a kind of coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN with
SNCR/SCR couples method of denitration and device.
Background technology
Industry of the coking as high pollution, it includes particulate matter, SO to be discharged into the pollutant of air in production process2、NOx、CO、
H2S、NH3, BaP, phenol etc., harm caused by generated each pollutant has aroused widespread concern in all circles of society.According to system
Meter, whole nation SO in 20152Total emission volumn is 1859.1 ten thousand t, NOx emission total amount is 1851.8 ten thousand t.Carbonization of coal is industrial coal
One of field primary pollution source, coke oven flue gas are most important exhaust emission source, about 60% SO in coal chemical enterprise2And 90%
NOx derives from this.It is shown according to the data of Chinese coking industry association, by the end of the year in 2014, is included in employer's organization's statistics
About more than 700 family of China's coal chemical enterprise, about more than 2000 seat of coke oven total quantity, can really reach《Coking chemistry emission of industrial pollutants
Standard》Less than one at.Independent coal chemical enterprise, with COG mode of heatings, the discharge capacity of NOx is generally in 800~2000mg/m3；
Mating coke-oven plant of integrated iron and steel works generally uses BFG or MG to heat, and the discharge capacity of NOx is generally in 350~650mg/m3。
Start the national standard executed on January 1st, 2015《Coking chemistry emission of industrial pollutants standard》To atmosphere pollution NOXDischarge
It is as follows to define limit value：General area：500mg/m3, key area：150mg/m3.Increasingly due to national policy environmental requirement
Strictly, the flue gas nitrogen oxide concentration of existing many coke-oven plants fails the severe situation for reaching discharging standards, being on the rise,
Force more attention of the coking industry to coke oven flue gas denitrating technique.
The common denitrating technique of coking industry mainly uses denitrating flue gas after stove, method mainly active charcoal absorption at present
Method, ozone oxidation absorption process, selective non-catalytic reduction (SNCR) method and selective catalytic reduction (SCR) method.
CN204073849U discloses a kind of coke oven flue gas SCR denitration system, is burnt by the way that swinging flue gas heat-exchange unit and pipeline is arranged
Device carries out two level heating and solves the problems, such as that coke oven flue gas temperature is relatively low, and this method uses reheating, enables SCR denitration system
Consumption increases, and inevitably generates secondary pollution in combustion process, increases whole operating cost；CN10526582B is disclosed
A kind of coking flue gas method method of denitration and denitrating system carry out the SNCR stages of reaction in coke oven combustion chamber flue down current,
Then flue gas exchanges heat through regenerative chamber and reaches one section of flue of coke oven, SCR reactions is carried out in one section of flue of coke oven, finally in coke oven two
SCR reactions are carried out in section flue, this method carries out SNCR reactions in flue, and flue temperature is excessively high so that ammonia is oxidized to nitrogen
The denitration effect in later stage may be not achieved in oxide.
Existing coke oven flue gas denitration technology and method are analyzed, mostly uses SCR and SNCR denitration technology greatly.Due to coke oven flue gas
Compared with power-plant flue gas, temperature is relatively low, cannot meet the optimum temperature of SCR reactions, needs the method ability for additionally heating flue gas
It is enough to meet, it can thus increase a large amount of fuel energy or heat transmission equipment acquisition cost.And boiler of power plant is used
SNCR denitration technology, denitration efficiency is relatively low, and the flue gas after denitration still cannot be up to state standards requirement, with boiler large space,
Complex flowfield is related, because flowing velocity is fast, flue gas cannot be made to be mixed with ammonia well, the residence time is shorter.
Invention content
High in order to solve above-mentioned coke oven flue gas nitrous oxides concentration discharge, SCR denitration technique additionally consumes the energy and SCR
High problem is invested in denitration device operation, and the present invention provides a kind of coke oven regenerator UTILIZATION OF VESIDUAL HEAT INs to couple denitration with SNCR/SCR
Method and apparatus, the concentration which can effectively reduce nitrogen oxides reaches discharging standards, and need not increase
On the basis of heating equipment, denitrating system cost is reduced.
This method include that UTILIZATION OF VESIDUAL HEAT IN couples method of denitration with SNCR, UTILIZATION OF VESIDUAL HEAT IN couples method of denitration with SCR and
SNCR denitration and SCR denitration coupling process, wherein
The UTILIZATION OF VESIDUAL HEAT IN couples method of denitration with SNCR：Coke oven flue gas enters checker brick from chute, through overheat
Exchange process, flue-gas temperature are reduced to 1100 DEG C hereinafter, starting to spray by ammonia nitrogen ratio 1.0-1.3 to the indoor spray ammonia space of accumulation of heat
Ammonia carries out SNCR reactions, completes first step denitrification process, and denitration efficiency reaches 40%~65%；It is compared to conventional power plants
The boiler smoke SNCR denitration of application, flowing is more slow, and the residence time is longer, can have time enough to carry out SNCR anti-
It answers.
The UTILIZATION OF VESIDUAL HEAT IN couples method of denitration with SCR：UTILIZATION OF VESIDUAL HEAT IN of the coke oven flue gas Jing Guo the first step with
After SNCR couples denitration reaction, continue to exchange heat with the checker brick below spray ammonia space, temperature is reduced to 450 DEG C hereinafter, coke oven
Flue gas reaches SCR catalyst section, carries out SCR denitration reaction, and denitration efficiency reaches 80%~90%；
The SNCR denitration is specially with SCR denitration coupling process：It is remaining that UTILIZATION OF VESIDUAL HEAT IN couples denitration reaction section with SNCR
Ammonia denitration reaction section is coupled with SCR for UTILIZATION OF VESIDUAL HEAT IN, overall process only needs once to spray ammonia, and UTILIZATION OF VESIDUAL HEAT IN is coupled with SCR
Denitration reaction section need not spray into ammonia again.Compared with existing coke oven flue gas reheats SCR denitration technique, it is pre- to reduce flue gas
The energy consumption of heat, and save a large amount of denitration device investments and space.
UTILIZATION OF VESIDUAL HEAT IN with SCR couple method of denitration used in the shapes of checker brick be rectangular, round, polygon or side
The hole count of the forms such as shape or round combination, checker brick is 6~30 holes.
It is below 1100 DEG C of checker brick below to spray the setting of ammonia space in temperature, and the UTILIZATION OF VESIDUAL HEAT IN couples denitration with SNCR
The reaction temperature section of reaction is 850 DEG C~1100 DEG C, and conversion zone is located at spray ammonia space and sprays the grid below ammonia space
In brick channel.
SCR catalyst is built by laying bricks or stones in the regenerative chamber that temperature range is 300 DEG C~450 DEG C, the temperature and Medium temperature SCR in the section
Catalytic denitration reaction optimum temperature is consistent, and UTILIZATION OF VESIDUAL HEAT IN couples denitration reaction temperature range with SCR at 300 DEG C~450 DEG C.SCR
Catalyst has both the function of accumulation of heat, realizes fume afterheat using the coupling with flue gas SCR denitration.
The coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN with SNCR/SCR couple method of denitration used in device, be divided into from top to bottom
Five sections：Heat accumulating sections one, accumulation of heat couple denitration section and heat accumulating sections three with SCR with SNCR denitration coupled section, heat accumulating sections two, accumulation of heat, packet
Include checker brick channel, regenerative chamber list wall, spray gun, spray ammonia pipeline, spray ammonia space, checker brick hole wall, SCR catalyst section and spray gun
Placement hole, high-temperature flue gas enter checker brick channel, and for high-temperature flue gas with checker brick after heat exchange, flue-gas temperature is less than 1100
DEG C, it is spray ammonia space in this temperature range, the side in spray ammonia space is equipped with spray gun placement hole, and spray gun placement hole installation spray gun is used for
Ammonia is sprayed, the side of spray gun is connected with spray ammonia pipeline, and spray ammonia pipeline is arranged in regenerative chamber list portion within the walls.
The above-mentioned technical proposal of the present invention has the beneficial effect that：
UTILIZATION OF VESIDUAL HEAT IN of the present invention couples method of denitration with SCR and can be used for current coke oven flue gas denitration with device, and coke oven stores
Hot cell UTILIZATION OF VESIDUAL HEAT IN couples method of denitration with SNCR/SCR and is transformed with device more suitable for creating the denitrating technique of coke oven.This method
Fume afterheat is utilized and is coupled with denitration technology, process structure is simple, changes checker brick and is relatively easy to, and need not purchase SCR cigarettes
Gas denitration device and system reduce energy consumption and operation cost of investment so that denitration efficiency compared to traditional SCR denitration system
It significantly improves.
Description of the drawings
Fig. 1 is the structural schematic diagram that coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN of the present invention couples denitrification apparatus with SNCR/SCR；
Fig. 2 couples denitration structure with SNCR/SCR for the coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN under the checker brick correspondence of the present invention and shows
It is intended to；
Fig. 3 is the hollow brick and checker brick attachment structure schematic diagram of the present invention.
Wherein：1- checker brick channel, 2- regenerative chamber list walls, 3- spray guns, 4- spray ammonia pipeline, and 5- sprays ammonia space, 6- checker brick
Hole wall, between the catalyst zones 7-SCR, 8- spray gun placement holes.
Specific implementation mode
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail.
A kind of coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN of present invention offer couples method of denitration and device with SNCR/SCR.
As shown in Figure 1, Figure 2, Figure 3 shows, the device include checker brick channel 1, regenerative chamber list wall 2, spray gun 3, spray ammonia pipeline 4,
Spray ammonia space 5, checker brick hole wall 6, SCR catalyst section 7, spray gun placement hole 8, wherein checker brick channel 1, spray ammonia space 5, lattice
Sub- brick hole wall 6 is arranged in order from top to bottom, and regenerative chamber list wall 2 is located at 1 outside of checker brick channel, and spray ammonia pipeline 4 is located at regenerative chamber
In single wall 2, the end of spray ammonia pipeline 4 is connected with spray gun 3, and spray gun 3 is mounted on by spray gun placement hole 8 in spray ammonia space 5.
Such as Fig. 1, in the side of coke oven regenerator setting spray ammonia pipeline 4, spray ammonia pipeline 4 is located in regenerative chamber list wall 2.
Such as Fig. 2, the certain position below distance spray ammonia space 5, checker brick hole wall 6 is made of SCR catalyst or in wall
SCR catalyst is coated on face, which is SCR catalyst section 7.
By taking Fig. 2 as an example, high temperature coke oven flue gas is flowed out from chute enters checker brick channel 1, coke oven flue gas in regenerator top
After the heat exchange with checker brick, flue gas enters spray ammonia space 5, and flue-gas temperature is less than 1100 DEG C at this time, from spray ammonia pipeline 4 into
The ammonia reducing agent entered is injected to ammonia space 5, and ammonia is mixed with high-temperature flue gas, and ammonia and nitrogen oxides progress SNCR denitration are anti-
It answers.Fail to complete in spray ammonia space 5 SNCR reactions ammonia can continue in the checker brick channel 2 below spray ammonia space 5 into
Row, when the temperature of checker brick is less than 850 DEG C, SNCR denitration reaction efficiency, which reduces, even no longer to react.Remaining ammonia after
Continuous and flue gas flows downwardly together, and arrival checker brick temperature is 300 DEG C~450 DEG C sections, which is SCR catalyst
Section 7.In the SCR catalyst section 7, remaining ammonia and SCR catalyst carry out SCR denitration with nitrogen oxides and react.Cigarette
Gas passes through SNCR and SCR denitration reactions twice, nitrogen oxygen when being discharged from regenerator bottom in flue gas from regenerative chamber top to lower part
Compound concentration reaches minimum discharge standard.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, several improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN couples method of denitration with SNCR/SCR, it is characterised in that：Including UTILIZATION OF VESIDUAL HEAT IN with
SNCR couplings method of denitration, UTILIZATION OF VESIDUAL HEAT IN couple method of denitration and SNCR denitration and SCR denitration coupling process with SCR, wherein
The UTILIZATION OF VESIDUAL HEAT IN couples method of denitration with SNCR：Coke oven flue gas enters checker brick from chute, by heat exchange
Process, flue-gas temperature are reduced to 1100 DEG C hereinafter, starting to spray into ammonia by ammonia nitrogen ratio 1.0-1.3 to the indoor spray ammonia space of accumulation of heat
Gas carries out SNCR reactions, completes first step denitrification process, and denitration efficiency reaches 40%~65%；
The UTILIZATION OF VESIDUAL HEAT IN couples method of denitration with SCR：UTILIZATION OF VESIDUAL HEAT IN of the coke oven flue gas Jing Guo the first step and SNCR couplings
After closing denitration reaction, continue to exchange heat with the checker brick below spray ammonia space, temperature is reduced to 450 DEG C hereinafter, coke oven flue gas arrives
Up to SCR catalyst temperature section, SCR denitration reaction is carried out, denitration efficiency reaches 80%~90%；
The SNCR denitration is specially with SCR denitration coupling process：UTILIZATION OF VESIDUAL HEAT IN couples the remaining ammonia of denitration reaction section with SNCR
Gas couples denitration reaction section with SCR for UTILIZATION OF VESIDUAL HEAT IN, and overall process only needs once to spray ammonia, and UTILIZATION OF VESIDUAL HEAT IN couples denitration with SCR
Conversion zone need not spray into ammonia again.
2. coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN according to claim 1 couples method of denitration with SNCR/SCR, it is characterised in that：
The UTILIZATION OF VESIDUAL HEAT IN with SCR couple method of denitration used in checker brick shape be rectangular, round, polygon or it is rectangular or
The hole count of the form that circle combines, checker brick is 6~30 holes.
3. coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN according to claim 1 couples method of denitration with SNCR/SCR, it is characterised in that：
The spray ammonia space setting is below 1100 DEG C of checker brick below in temperature, and the UTILIZATION OF VESIDUAL HEAT IN couples denitration reaction with SNCR
Reaction temperature section be 850 DEG C~1100 DEG C, the checker brick that conversion zone is located at spray ammonia space and sprays below ammonia space are logical
In road.
4. coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN according to claim 1 couples method of denitration with SNCR/SCR, it is characterised in that：
The SCR catalyst is built by laying bricks or stones in the regenerative chamber that temperature range is 300 DEG C~450 DEG C, and temperature and the Medium temperature SCR in the section are catalyzed
Denitration reaction optimum temperature is consistent, and UTILIZATION OF VESIDUAL HEAT IN couples denitration reaction temperature range with SCR at 300 DEG C~450 DEG C.
5. coke oven regenerator UTILIZATION OF VESIDUAL HEAT IN according to claim 1 with SNCR/SCR couple method of denitration used in device,
It is characterized in that：The device is divided into five sections from top to bottom：Heat accumulating sections one, accumulation of heat and SNCR denitration coupled section, heat accumulating sections two,
Accumulation of heat couples denitration section and heat accumulating sections three, including checker brick channel (1), regenerative chamber list wall (2), spray gun (3), spray ammonia pipe with SCR
Road (4), spray ammonia space (5), checker brick hole wall (6), SCR catalyst section (7) and spray gun placement hole (8), high-temperature flue gas enter
Checker brick channel (1), for high-temperature flue gas with checker brick after heat exchange, flue-gas temperature is less than 1100 DEG C, is in this temperature range
It sprays ammonia space (5), the side of spray ammonia space (5) is equipped with spray gun placement hole (8), and spray gun placement hole (8) installation spray gun (3) is for spraying
The side of ammonia, spray gun (3) is connected with spray ammonia pipeline (4), and spray ammonia pipeline (4) is arranged internal in regenerative chamber list wall (2).
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| CN201810495274.0A CN108579360B (en) | 2018-05-22 | 2018-05-22 | Coke oven regenerator waste heat utilization and SNCR/SCR coupled denitration method and device |
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| CN201810495274.0A CN108579360B (en) | 2018-05-22 | 2018-05-22 | Coke oven regenerator waste heat utilization and SNCR/SCR coupled denitration method and device |
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| CN109357550A (en) * | 2018-11-21 | 2019-02-19 | 濮阳濮耐高温材料（集团）股份有限公司 | A kind of coke oven heat-exchanger rig and preparation method |
| CN109916185A (en) * | 2019-01-04 | 2019-06-21 | 上海轩鼎冶金科技有限公司 | A kind of denitration fume extractor and regenerative combustion system |
| CN111111437A (en) * | 2020-02-28 | 2020-05-08 | 九江润诚新材料有限公司 | Multistage denitration ultralow-emission method in heat storage chamber of longitudinal flame energy-saving environment-friendly glass kiln, heat storage chamber and application thereof |
| CN111111439A (en) * | 2020-02-28 | 2020-05-08 | 九江润诚新材料有限公司 | Multistage denitration ultralow-emission method for regenerator of longitudinal flame energy-saving environment-friendly glass kiln, regenerator and application of method |
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| CN111111439A (en) * | 2020-02-28 | 2020-05-08 | 九江润诚新材料有限公司 | Multistage denitration ultralow-emission method for regenerator of longitudinal flame energy-saving environment-friendly glass kiln, regenerator and application of method |
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| CN108579360B (en) | 2020-09-11 |
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