CN106823799A - Urea pyrolysis SCR denitration device - Google Patents
Urea pyrolysis SCR denitration device Download PDFInfo
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- CN106823799A CN106823799A CN201710224502.6A CN201710224502A CN106823799A CN 106823799 A CN106823799 A CN 106823799A CN 201710224502 A CN201710224502 A CN 201710224502A CN 106823799 A CN106823799 A CN 106823799A
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- Prior art keywords
- urea
- pyrolysis
- catalyst
- pyrolysis oven
- scr denitration
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 74
- 239000004202 carbamide Substances 0.000 title claims abstract description 61
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000007921 spray Substances 0.000 claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000000889 atomisation Methods 0.000 claims abstract description 4
- 239000003054 catalyst Substances 0.000 claims description 58
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical group N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 31
- 229910021529 ammonia Inorganic materials 0.000 claims description 15
- 239000003085 diluting agent Substances 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 7
- 239000008246 gaseous mixture Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims 1
- 239000004744 fabric Substances 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000006837 decompression Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 10
- 239000003546 flue gas Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000005507 spraying Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B01D53/74—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
- 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
- B01D53/90—Injecting reactants
-
- 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
- B01D2251/2067—Urea
Abstract
The present invention relates to a kind of urea pyrolysis SCR denitration device, belong to gas denitrifying technology field, including：Pyrolysis oven, its gas outlet connection SCR reactors；Pyrolysis oven furnace wall side is provided with spray gun, and the nozzle of spray gun is located in the stove of pyrolysis oven；Urea dissolving tank, it connects urea liquid storage tank through delivery pump, and the urea liquid storage tank connects the entrance of metering device A through flow pump；Overheated steam pipe, its entrance that metering device B is connected through pressure-reducing valve；Wherein, the outlet of the metering device A and metering device B is connected to the entrance of distributive mixing device, and through the distributive mixing device, urea liquid is by after superheated steam atomization, pyrolysis oven being sprayed into through spray gun.The present invention, as atomizing medium, by after decompression, by pressure stability in suitable value range, it is ensured that the jet velocity of urea liquid, increased eject momentum using superheated steam, the problems such as do not result in the spray nozzle clogging of spray gun.
Description
Technical field
The present invention relates to a kind of urea pyrolysis SCR denitration device, belong to gas denitrifying technology field.
Background technology
Urea pyrolysis SCR denitration technique, refers to by metering distribute module system by the urea liquid of 50% mass concentration
Afterwards, entered in pyrolysis oven by spray gun atomized spray, decomposed with high-temperature hot-air and mixed, entered by AIG (ammonia-spraying grid)
Enter in SCR reactors, with the NO in flue gasxReaction produces N2And H2O.The atomizing effect of spray gun determines that urea pyrolysis ammonia is imitated
The height of rate.The effect of atomizing medium is the mixing for strengthening reductant solution and inner flue gas of the stove, and improves reducing agent injection speed
Degree.At present, it is general to use station-service compressed air as atomizing medium, and install SCR denitration system additional, when SCR urea pyrolysis denitrations
Spray gun use station-service compressed air when, often exist air supply deficiency, it is necessary to increase air compressor system；Or compression
Air quality is poor, is resulted in blockage to nozzle；Or compressed air pressure is smaller, cause to go out situations such as atomizing effect is poor
It is existing.
The content of the invention
To solve the above problems, it is an object of the invention to provide a kind of urea pyrolysis SCR denitration device, it uses overheat
Steam is used as atomizing medium.
The purpose of the present invention is achieved through the following technical solutions：
A kind of urea pyrolysis SCR denitration device, including：
Pyrolysis oven, the ammonia-spraying grid in the gas outlet connection SCR reactors of the pyrolysis oven；Pyrolysis oven furnace wall side is provided with spray
Rifle, and spray gun nozzle be located at pyrolysis oven stove in；
Urea dissolving tank, it connects urea liquid storage tank through delivery pump, and the urea liquid storage tank is connected through flow pump and counted
The entrance of amount device A；
Overheated steam pipe, its entrance that metering device B is connected through pressure-reducing valve；
Wherein, the outlet of the metering device A and metering device B is connected to the entrance of distributive mixing device, through described
Distributive mixing device, urea liquid is by after superheated steam atomization, pyrolysis oven being sprayed into through spray gun.
Further, hot blast is sent into pyrolysis oven by the heated device B of warm-air pipe by the air intake vent at the top of pyrolysis oven.
Further, also including diluent air pipeline, diluent air passes sequentially through centrifugal high pressure fan, cleaner and heating
Device A is delivered in distributive mixing device.
Further, the gas outlet of pyrolysis oven is provided with ammonia density detector.
Further, the spray gun is located at the middle and upper part of pyrolysis oven.
Further, also including urea warehouse and Weighing feeder, the urea warehouse is fixed by the Weighing feeder
Measure feeding to urea dissolving tank.
Further, regulating valve, pressure gauge and temperature are equipped with the overheated steam pipe, warm-air pipe and diluent air pipeline
Degree meter, also is provided with thermometer on pyrolysis oven, the SCR reactors are connected to temperature controller.
Further, hot-air blowing valve is provided with the pyrolysis oven, it is moved back and forth up and down in pyrolysis oven.
Further, ammonia sky gaseous mixture return valve is provided between pyrolysis oven and SCR reactors, for unnecessary ammonia sky to be mixed
Gas is back in pyrolysis oven.
Further, the SCR reactors are also connected with catalyst injector, and it is anti-that the catalyst injector is included in SCR
Answer the pipeline and the multiple shower nozzles along the pipe arrangement extended in device；The catalyst injector is provided with adjuster, is used for
Regulation catalyst injector sprays into the amount of fine catalyst in Benitration reactor；
The catalyst injector connects catalyst conveying device, for fine catalyst to be delivered to from catalyst storage tank
Catalyst injector, the catalyst conveying device includes：
Blower fan, the source of the gas for providing conveying fine catalyst；
Rotation glassware, is connected with catalyst storage tank, blower fan and catalyst injector respectively, for that will be catalyzed under fan action
Fine catalyst in agent storage tank is delivered to the catalyst injector.
Further, Weighing feeder, delivery pump, flow pump, metering device A, distributive mixing device, pressure-reducing valve, metering
Device B, spray gun, SCR reactors, regulating valve, temperature controller, hot-air blowing valve, ammonia sky gaseous mixture return valve, catalyst ejector
Device, catalyst conveying device access automaton, and the signal according to ammonia density detector, pressure gauge and thermometer is anti-
Feedback, under the control of the automaton, the urea pyrolysis SCR denitration device is acted.
Further, the temperature of the pyrolysis oven air intake vent is 500~600 DEG C, and the temperature of the pyrolysis oven gas outlet is
300~350 DEG C.
Beneficial effects of the present invention are：
The present invention using superheated steam as atomizing medium, by after decompression, by pressure stability in suitable value range, really
The jet velocity of urea liquid has been protected, eject momentum has been increased；In addition, superheated steam is for power plant, vapour source is more sufficient,
And vapour source quality is preferably, the problems such as do not result in the spray nozzle clogging of spray gun.
SCR denitration device of the present invention, catalyst is to be injected in flue gas in the form of a powder, therefore it is suitable for
Used in dirt environment high, the catalytic effect of catalyst will not be influenceed by flue gas and be reduced with the time.In addition, by fine catalyst
In penetrating flue gas, it is ensured that catalyst has maximum respond, it is that can reach preferable denitration effect to spray a small amount of catalyst.
In addition, SCR denitration device of the present invention is by the use of the hot blast in warm-air pipe as thermal source, diluent air can be used as auxiliary
Source of the gas is helped, while the setting of the hot-air blowing valve in pyrolysis oven so that pyrolysis oven furnace bottom is not in that urea crystals are blocked, and sprays ammonia
Grid is not easy to Crystallization Plugging.
Brief description of the drawings
Fig. 1 is SCR denitration device structural representation of the present invention；
Wherein, 1- urea warehouse, 2- Weighing feeders, 3- urea dissolving tanks, 4- delivery pumps, 5- urea liquid storage tanks, 6-
Flow pump, 7- metering devices A, 8- distributive mixing device, 9- overheated steam pipes, 10- pressure-reducing valves, 11- metering devices B, 12- spray
Rifle, 13- pyrolysis ovens, 14-SCR reactors, 15- centrifugal high pressure fans, 16- cleaners, 17- heaters A, 18- warm-air pipe, 19-
Heater B.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the present invention, not
For limiting the present invention.
As shown in figure 1, a kind of urea pyrolysis SCR denitration device, including：
Pyrolysis oven 13, the ammonia-spraying grid of the gas outlet connection SCR reactors 14 of the pyrolysis oven 13, and pyrolysis oven 13 go out
Gas port is additionally provided with ammonia density detector.The furnace wall side middle and upper part of pyrolysis oven 13 is provided with spray gun 12, and the nozzle of spray gun 12 is located at pyrolysis
In the stove of stove 13.
, by the quantitative feed of the Weighing feeder 2 to urea dissolving tank 3, urea dissolving tank 3 is through delivery pump for urea warehouse 1
4 connection urea liquid storage tanks 5, the urea liquid storage tank 5 connects the entrance of metering device A7 through flow pump 6.
Overheated steam pipe 9, its entrance that metering device B11 is connected through pressure-reducing valve 10.
Wherein, the outlet of the metering device A7 and metering device B11 is connected to the entrance of distributive mixing device 8, warp
The distributive mixing device 8, urea liquid is by after superheated steam atomization, pyrolysis oven 13 being sprayed into through spray gun 12.
Hot blast is sent into pyrolysis oven 13 by the heated device B19 of warm-air pipe 18 by the air intake vent at the top of pyrolysis oven 13.
Diluent air pipeline, it is specially：Diluent air passes sequentially through centrifugal high pressure fan 15, cleaner 16 and heater
A17 is delivered in distributive mixing device 8.
Regulating valve, pressure gauge and thermometer are equipped with the overheated steam pipe 9, warm-air pipe 18 and diluent air pipeline,
Thermometer also is provided with pyrolysis oven 13, the SCR reactors 14 are connected to temperature controller.
Hot-air blowing valve is provided with the pyrolysis oven 13, it is moved back and forth up and down in pyrolysis oven 13；
Ammonia sky gaseous mixture return valve is provided between pyrolysis oven 13 and SCR reactors 14.
The SCR reactors 14 are also connected with catalyst injector, and the catalyst injector is included in SCR reactors 14
The pipeline of extension and the multiple shower nozzles along the pipe arrangement；The catalyst injector is provided with adjuster, is urged for adjusting
Agent injector sprays into the amount of fine catalyst in Benitration reactor；
The catalyst injector connects catalyst conveying device, for fine catalyst to be delivered to from catalyst storage tank
Catalyst injector, the catalyst conveying device includes：
Blower fan, the source of the gas for providing conveying fine catalyst；
Rotation glassware, is connected with catalyst storage tank, blower fan and catalyst injector respectively, for that will be catalyzed under fan action
Fine catalyst in agent storage tank is delivered to the catalyst injector.
Weighing feeder 2, delivery pump 4, flow pump 6, metering device A7, distributive mixing device 8, pressure-reducing valve 10, metering dress
Put B11, spray gun 12, SCR reactors 14, regulating valve, temperature controller, hot-air blowing valve, ammonia sky gaseous mixture return valve, catalyst
Injector, catalyst conveying device access automaton, according to the signal of ammonia density detector, pressure gauge and thermometer
Feedback, under the control of the automaton, the urea pyrolysis SCR denitration device is acted.
Technological process of the invention is：Urea warehouse, to urea dissolving tank, uses desalination by Weighing feeder quantitative feed
Dry urea is dissolved into water the urea liquid of 50% mass concentration, is conveyed by urea liquid and is pumped into urea liquid storage tank；
Then enter in pyrolysis oven via high flow capacity circulating pump, metering device, distributive mixing device, atomizer etc. and decompose, generation
NH3、H2O and CO2, it is then uniform to spray into denitrating system；After uniformly mixing with flue gas, in the presence of SCR catalyst reactors
React, remove NOx.
The present invention can provide reliable and stable SCR urea pyrolysis denitration spray gun atomizing mediums, reduce investment, reduce spray gun and block up
The risk of plug.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of urea pyrolysis SCR denitration device, it is characterised in that including：
Pyrolysis oven (13), the gas outlet of the pyrolysis oven (13) connects SCR reactors (14)；Pyrolysis oven (13) furnace wall side is provided with spray
Rifle (12), and spray gun (12) nozzle be located at pyrolysis oven (13) stove in；
Urea dissolving tank (3), it connects urea liquid storage tank (5) through delivery pump (4), and the urea liquid storage tank (5) is through flow
The entrance of pump (6) connection metering device A (7)；
Overheated steam pipe (9), its entrance that metering device B (11) is connected through pressure-reducing valve (10)；
Wherein, the outlet of the metering device A (7) and metering device B (11) is connected to the entrance of distributive mixing device (8),
Through the distributive mixing device (8), urea liquid is by after superheated steam atomization, pyrolysis oven (13) being sprayed into through spray gun (12).
2. urea pyrolysis SCR denitration device according to claim 1, it is characterised in that the heated device B of warm-air pipe (18)
(19) hot blast is sent into pyrolysis oven (13) by the air intake vent at the top of pyrolysis oven (13).
3. urea pyrolysis SCR denitration device according to claim 1, it is characterised in that dilute also including diluent air pipeline
Release air and pass sequentially through centrifugal high pressure fan (15), cleaner (16) and heater A (17) and be delivered to distributive mixing device (8)
In.
4. urea pyrolysis SCR denitration device according to claim 1, it is characterised in that the gas outlet of pyrolysis oven (13) sets
There is ammonia density detector.
5. urea pyrolysis SCR denitration device according to claim 1, it is characterised in that the spray gun (12) is positioned at pyrolysis
The middle and upper part of stove (13).
6. urea pyrolysis SCR denitration device according to claim 1, it is characterised in that also including urea warehouse (1) and claim
Weight batcher (2), the urea warehouse (1) is by the Weighing feeder (2) quantitative feed to urea dissolving tank (3).
7. the urea pyrolysis SCR denitration device according to Claims 2 or 3, it is characterised in that the overheated steam pipe (9),
Regulating valve, pressure gauge and thermometer are equipped with warm-air pipe (18) and diluent air pipeline, pyrolysis oven also is provided with temperature on (13)
Meter, the SCR reactors (14) are connected to temperature controller.
8. urea pyrolysis SCR denitration device according to claim 1, it is characterised in that is provided with the pyrolysis oven (13)
Hot-air blowing valve, it is moved back and forth up and down in pyrolysis oven (13)；
Ammonia sky gaseous mixture return valve is provided between pyrolysis oven (13) and SCR reactors (14).
9. urea pyrolysis SCR denitration device according to claim 1, it is characterised in that the SCR reactors (14) also connect
Catalyst injector is connect, the catalyst injector is included in the interior pipeline for extending of SCR reactors (14) and along the pipeline cloth
The multiple shower nozzles put；The catalyst injector is provided with adjuster, and Benitration reactor is sprayed into for adjusting catalyst injector
The amount of middle fine catalyst；
The catalyst injector connects catalyst conveying device, for fine catalyst to be delivered into catalysis from catalyst storage tank
Agent injector, the catalyst conveying device includes：
Blower fan, the source of the gas for providing conveying fine catalyst；
Rotation glassware, is connected, with catalyst storage tank, blower fan and catalyst injector for storing up catalyst under fan action respectively
Fine catalyst in tank is delivered to the catalyst injector.
10. the urea pyrolysis SCR denitration device according to any one of claim 4~9, it is characterised in that Weighing feeder
(2), delivery pump (4), flow pump (6), metering device A (7), distributive mixing device (8), pressure-reducing valve (10), metering device B
(11), spray gun (12), SCR reactors (14), regulating valve, temperature controller, hot-air blowing valve, ammonia sky gaseous mixture return valve, urge
Agent injector, catalyst conveying device access automaton, according to ammonia density detector, pressure gauge and thermometer
Signal is fed back, and under the control of the automaton, the urea pyrolysis SCR denitration device is acted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710224502.6A CN106823799A (en) | 2017-04-07 | 2017-04-07 | Urea pyrolysis SCR denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710224502.6A CN106823799A (en) | 2017-04-07 | 2017-04-07 | Urea pyrolysis SCR denitration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106823799A true CN106823799A (en) | 2017-06-13 |
Family
ID=59148276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710224502.6A Pending CN106823799A (en) | 2017-04-07 | 2017-04-07 | Urea pyrolysis SCR denitration device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106823799A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109316962A (en) * | 2018-11-20 | 2019-02-12 | 张扬 | Middle low temperature SCR denitration urea pyrolysis and catalyst regeneration integral process |
| CN110975599A (en) * | 2019-10-30 | 2020-04-10 | 江苏天莱环保工程有限公司 | In-furnace denitration system and process |
| CN114870625A (en) * | 2022-03-04 | 2022-08-09 | 华电电力科学研究院有限公司 | Urea solution preparation system and method for urea ammonia production device |
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| CN110975599A (en) * | 2019-10-30 | 2020-04-10 | 江苏天莱环保工程有限公司 | In-furnace denitration system and process |
| CN114870625A (en) * | 2022-03-04 | 2022-08-09 | 华电电力科学研究院有限公司 | Urea solution preparation system and method for urea ammonia production device |
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