CN110585923A - Diesel engine tail gas afterburning flue gas denitration system and method - Google Patents
Diesel engine tail gas afterburning flue gas denitration system and method Download PDFInfo
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- CN110585923A CN110585923A CN201910858738.4A CN201910858738A CN110585923A CN 110585923 A CN110585923 A CN 110585923A CN 201910858738 A CN201910858738 A CN 201910858738A CN 110585923 A CN110585923 A CN 110585923A
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- Prior art keywords
- flue
- diesel engine
- gas
- tail gas
- denitration
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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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
-
- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9495—Controlling the catalytic process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention provides a diesel engine tail gas afterburning flue gas denitration system which comprises a denitration reactor, wherein a tail gas discharge port of a diesel engine is connected with the denitration reactor through a tail gas flue and a bypass flue, a combustor and an ammonia agent nozzle are arranged in the bypass flue, and the ammonia agent nozzle is positioned on the rear side of the combustor. The invention also provides a flue gas denitration method for diesel engine tail gas afterburning. According to the invention, the bypass flue is additionally arranged to perform diesel engine tail gas afterburning, the smoke temperature is increased, the ammonia is prepared by pyrolysis, a pyrolysis furnace is not needed, the mixed smoke temperature meets the requirement of the selective catalytic reduction reaction, and the condition that the temperature of the diesel engine low-load tail gas is too low is avoided.
Description
Technical Field
The invention relates to the technical field of flue gas denitration, in particular to a diesel engine tail gas afterburning flue gas denitration system and a diesel engine tail gas afterburning flue gas denitration method.
Background
Nitrogen oxides are the main control object of national atmospheric pollution. For the removal of nitrogen oxides from diesel exhaust gases, a selective catalytic reduction process is generally used, using ammonia (NH) with the aid of a catalyst3) Reducing nitrogen oxides in the flue gas into nitrogen.
Ammonia (NH)3) Generally prepared by urea pyrolysis, the pyrolysis temperature is above 450 ℃. If the pyrolysis furnace is additionally configured to produce ammonia, the system complexity is increased, and the construction and operation cost is increased. The smoke temperature required by selective catalytic reduction denitration is within the range of 300-400 ℃, and if the load is low during the operation of the diesel engine, the smoke temperature can not meet the requirement of the reduction reaction, so that the denitration efficiency is reduced.
Therefore, how to remove nitrogen oxides in the tail gas of the diesel engine on the premise of not additionally arranging a pyrolysis ammonia production device and simultaneously avoiding the condition that the temperature of the tail gas with low load of the diesel engine is too low.
Disclosure of Invention
The invention aims to solve the technical problem of how to remove nitrogen oxides in tail gas of a diesel engine on the premise of not additionally arranging a pyrolysis ammonia production device, and simultaneously avoid the condition that the temperature of the tail gas with low load of the diesel engine is too low.
In order to solve the technical problems, the technical scheme of the invention is to provide a diesel engine tail gas afterburning flue gas denitration system, which is characterized in that: the denitration device comprises a denitration reactor, wherein a tail gas discharge port of a diesel engine is connected with the denitration reactor through a tail gas flue and a bypass flue, a combustor and an ammonia agent nozzle are arranged in the bypass flue, and the ammonia agent nozzle is positioned on the rear side of the combustor.
Preferably, the exhaust gas discharge port of the diesel engine is connected with the exhaust gas flue inlet and the bypass flue inlet, and the exhaust gas flue outlet and the bypass flue outlet are merged and then connected with the denitration reactor.
Preferably, the fuel of the burner is oil or gas.
Preferably, the ammonia agent nozzle is a multi-nozzle distributed spraying type.
The invention also provides a flue gas denitration method for diesel engine tail gas afterburning, which is characterized by comprising the following steps: the flue gas denitration system adopting the diesel engine tail gas afterburning comprises the following steps:
step 1: when the diesel engine runs, most of the smoke enters the tail flue, and a small part of the smoke enters the bypass flue;
step 2: starting the combustor when denitration is needed, and increasing the temperature of the flue gas in the bypass flue through afterburning of the combustor;
and step 3: the ammonia agent nozzle sprays the ammonia agent into the bypass flue for pyrolysis;
and 4, step 4: and ammonia generated by pyrolysis is taken away by flue gas in the bypass flue and is mixed with the flue gas in the tail flue, and the mixed flue gas enters the denitration reactor to react and is discharged.
Preferably, in the step 2, the temperature of the flue gas in the bypass flue is increased to more than 450 ℃ through the afterburning of the combustor.
Preferably, in the step 4, the mixed flue gas temperature meets the requirement of the selective denitration catalytic reduction reaction.
The system provided by the invention overcomes the defects of the prior art, improves the temperature of the flue gas to pyrolyze and prepare ammonia by additionally arranging the bypass flue to perform diesel engine tail gas afterburning, does not need a pyrolysis furnace, ensures that the temperature of the mixed flue gas meets the requirement of selective catalytic reduction reaction, and simultaneously avoids the condition of low-load tail gas temperature of the diesel engine.
Drawings
Fig. 1 is a schematic view of a flue gas denitration system for post combustion of diesel engine exhaust gas provided in this embodiment.
Detailed Description
The invention will be further illustrated with reference to the following specific examples.
Fig. 1 is a schematic diagram of a flue gas denitration system for diesel engine tail gas afterburning provided in this embodiment, and the flue gas denitration system for diesel engine tail gas afterburning includes a diesel engine 1, a tail gas flue 2, a bypass flue 3, a combustor 4, an ammonia agent nozzle 5, a denitration reactor 6, and the like. The tail gas discharge port of the diesel engine 1 is connected with the denitration reactor 6 through a tail gas flue 2 and a bypass flue 3.
In the embodiment, a bypass flue 3 is additionally arranged on a tail flue 2 of the diesel engine, a combustor 4 is arranged on the bypass flue 3, and an ammonia agent nozzle 5 is arranged behind the combustor 4. After the ammonia agent nozzle 5, the bypass flue 3 and the tail flue 2 are merged and connected with the denitration reactor 6.
The fuel of the burner 4 may be oil or gas.
The ammonia agent nozzle 5 adopts a multi-nozzle distributed spraying type.
The embodiment of the flue gas denitration system for diesel engine tail gas afterburning provided by the embodiment is as follows:
when the diesel engine runs, the flue gas enters the tail flue 2, and a small part of the flue gas is led to enter the bypass flue 3. When denitration is needed, the combustor 4 is started, and the temperature of the bypass flue gas is increased to more than 450 ℃ through afterburning of the combustor 4. The ammonia agent nozzle 5 sprays the ammonia agent into the bypass flue 3 for pyrolysis. The ammonia generated by pyrolysis is taken away by the bypass flue gas and is mixed with most of the remaining flue gas, and the mixed flue gas temperature is about 350 ℃, so that the requirement of the selective catalytic reduction reaction is met. The mixed flue gas enters the denitration reactor 6 for reaction and then is discharged.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a flue gas denitration system of diesel engine tail gas afterburning which characterized in that: including denitration reactor (6), the tail gas discharge port of diesel engine (1) passes through tail gas flue (2) and bypass flue (3) and connects denitration reactor (6), be equipped with combustor (4) and ammonia agent spout (5) in bypass flue (3), just ammonia agent spout (5) are located combustor (4) rear side.
2. The diesel engine tail gas after-combustion flue gas denitration system of claim 1, characterized in that: the tail gas discharge port of the diesel engine (1) is connected with the inlet of the tail gas flue (2) and the inlet of the bypass flue (3), and the outlet of the tail gas flue (2) and the outlet of the bypass flue (3) are converged and then connected with the denitration reactor (6).
3. The diesel engine tail gas after-combustion flue gas denitration system of claim 1, characterized in that: the fuel of the combustor (4) is fuel oil or fuel gas.
4. The diesel engine tail gas after-combustion flue gas denitration system of claim 1, characterized in that: the ammonia agent nozzle (5) is in a multi-nozzle distributed spraying type.
5. A diesel engine tail gas afterburning flue gas denitration method is characterized in that: the diesel engine tail gas after-combustion flue gas denitration system of any one of claims 1 to 4 is adopted, and comprises the following steps:
step 1: when the diesel engine runs, most of the smoke enters the tail flue (2), and a small part of the smoke enters the bypass flue (3);
step 2: when denitration is needed, the combustor (4) is started, and the temperature of the flue gas in the bypass flue (3) is increased through afterburning of the combustor (4);
and step 3: the ammonia agent nozzle (5) sprays the ammonia agent into the bypass flue (3) for pyrolysis;
and 4, step 4: and ammonia generated by pyrolysis is taken away by flue gas in the bypass flue (3) and is mixed with the flue gas in the tail flue (2), and the mixed flue gas enters the denitration reactor (6) to react and is discharged.
6. The diesel engine exhaust after-combustion flue gas denitration method of claim 5, characterized in that: in the step 2, the temperature of the flue gas in the bypass flue (3) is increased to more than 450 ℃ through the afterburning of the combustor (4).
7. The diesel engine exhaust after-combustion flue gas denitration method of claim 5, characterized in that: in the step 4, the mixed flue gas temperature meets the requirements of selective denitration catalytic reduction reaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910858738.4A CN110585923A (en) | 2019-09-11 | 2019-09-11 | Diesel engine tail gas afterburning flue gas denitration system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910858738.4A CN110585923A (en) | 2019-09-11 | 2019-09-11 | Diesel engine tail gas afterburning flue gas denitration system and method |
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| Publication Number | Publication Date |
|---|---|
| CN110585923A true CN110585923A (en) | 2019-12-20 |
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| CN201910858738.4A Pending CN110585923A (en) | 2019-09-11 | 2019-09-11 | Diesel engine tail gas afterburning flue gas denitration system and method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005254093A (en) * | 2004-03-10 | 2005-09-22 | Mitsui Eng & Shipbuild Co Ltd | Method and apparatus for denitrification |
| CN205392185U (en) * | 2016-02-19 | 2016-07-27 | 北京西山新干线除尘脱硫设备有限公司 | Gas boiler catalytic denitrification system |
| CN205995275U (en) * | 2016-08-05 | 2017-03-08 | 南京中电环保科技有限公司 | A kind of middle low-temperature denitration of flue gas device |
| CN208138023U (en) * | 2018-02-28 | 2018-11-23 | 上海发电设备成套设计研究院有限责任公司 | A kind of system for improving marine diesel delivery temperature and throwing denitration |
| CN211586036U (en) * | 2019-09-11 | 2020-09-29 | 上海发电设备成套设计研究院有限责任公司 | Diesel engine tail gas afterburning flue gas denitration system |
-
2019
- 2019-09-11 CN CN201910858738.4A patent/CN110585923A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005254093A (en) * | 2004-03-10 | 2005-09-22 | Mitsui Eng & Shipbuild Co Ltd | Method and apparatus for denitrification |
| CN205392185U (en) * | 2016-02-19 | 2016-07-27 | 北京西山新干线除尘脱硫设备有限公司 | Gas boiler catalytic denitrification system |
| CN205995275U (en) * | 2016-08-05 | 2017-03-08 | 南京中电环保科技有限公司 | A kind of middle low-temperature denitration of flue gas device |
| CN208138023U (en) * | 2018-02-28 | 2018-11-23 | 上海发电设备成套设计研究院有限责任公司 | A kind of system for improving marine diesel delivery temperature and throwing denitration |
| CN211586036U (en) * | 2019-09-11 | 2020-09-29 | 上海发电设备成套设计研究院有限责任公司 | Diesel engine tail gas afterburning flue gas denitration system |
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