CN114856763A - Tail gas aftertreatment system - Google Patents

Tail gas aftertreatment system Download PDF

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Publication number
CN114856763A
CN114856763A CN202110149120.8A CN202110149120A CN114856763A CN 114856763 A CN114856763 A CN 114856763A CN 202110149120 A CN202110149120 A CN 202110149120A CN 114856763 A CN114856763 A CN 114856763A
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CN
China
Prior art keywords
connecting part
communicated
pipeline
aftertreatment system
control valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110149120.8A
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Chinese (zh)
Inventor
刘健
孔正国
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Tenneco Exhaust System Co Ltd
Original Assignee
Shanghai Tenneco Exhaust System Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Tenneco Exhaust System Co Ltd filed Critical Shanghai Tenneco Exhaust System Co Ltd
Priority to CN202110149120.8A priority Critical patent/CN114856763A/en
Publication of CN114856763A publication Critical patent/CN114856763A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/011—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more purifying devices arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • 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
    • Y02T10/40—Engine management systems

Abstract

An exhaust gas post-treatment system comprises a first pipeline, a second pipeline and a third pipeline, wherein the second pipeline is provided with a first post-processor, and the third pipeline is provided with a second post-processor; the exhaust aftertreatment system further comprises an actuator enabling the exhaust aftertreatment system to be switched between a first operating mode and a second operating mode, wherein: in the first working mode, the tail gas firstly passes through the first post-processor and then passes through the second post-processor; in the second operating mode, the exhaust gas passes through the second post-processor and then passes through the first post-processor. Compared with the prior art, the first post-processor is arranged, the trend of the air flow is adjusted through the actuator, the structure of the system is simplified, and the back pressure is reduced.

Description

Tail gas aftertreatment system
Technical Field
The invention relates to a tail gas aftertreatment system, and belongs to the technical field of engine tail gas aftertreatment.
Background
With the increasing upgrading of emission legislation, this is increasingly demanding on exhaust gas aftertreatment systems. The prior art has disclosed a dual injection solution, i.e. the exhaust aftertreatment system comprises a first urea nozzle, a pre-SCR downstream of the first urea nozzle, a DOC downstream of the pre-SCR, a DPF downstream of said DOC, a second urea nozzle downstream of the DPF, and a main SCR downstream of the second urea nozzle. The tail gas aftertreatment system can comprise a plurality of working modes, wherein under the working condition of low temperature of an engine, a first urea nozzle works, at the moment, the first urea nozzle sprays atomized urea liquid drops to the upstream of the front SCR, and the urea liquid drops and the tail gas flow through the front SCR after being mixed so as to carry out primary treatment on harmful substances in the tail gas; under the high-temperature working condition of the engine, the first urea nozzle stops working, atomized urea liquid drops are sprayed to the upstream of the main SCR only by the aid of the second urea nozzle, and the urea liquid drops and the tail gas flow through the main SCR after being mixed so as to treat harmful substances in the tail gas.
It can be appreciated that prior art exhaust aftertreatment systems require two SCRs, which undoubtedly increases the backpressure of the system. In addition, the provision of two urea nozzles and two SCRs increases the complexity of the system, which also presents challenges to the placement of the various components.
Disclosure of Invention
The invention aims to provide an exhaust aftertreatment system with a simple structure and low back pressure.
In order to achieve the purpose, the invention adopts the following technical scheme: an exhaust gas aftertreatment system comprises a first pipeline, a second pipeline and a third pipeline, wherein the first pipeline is provided with a first connecting part and a second connecting part, the second pipeline is provided with a third connecting part, a fourth connecting part and a first aftertreatment device communicated between the third connecting part and the fourth connecting part, and the third pipeline is provided with a fifth connecting part, a sixth connecting part and a second aftertreatment device communicated between the fifth connecting part and the sixth connecting part; the exhaust gas aftertreatment system further comprises an actuator enabling the exhaust gas aftertreatment system to be switched between a first operating mode and a second operating mode, wherein:
in the first working mode, the tail gas firstly passes through the first post-processor and then passes through the second post-processor;
in the second operating mode, the exhaust gas passes through the second post-processor and then passes through the first post-processor.
As a further improved aspect of the present invention, the first connection portion, the third connection portion, and the fifth connection portion are connected to form a first junction portion, the second connection portion, the fourth connection portion, and the sixth connection portion are connected to form a second junction portion, and the actuator includes a first control valve installed in the first junction portion and a second control valve installed in the second junction portion.
As a further improvement of the present invention, the exhaust gas aftertreatment system further comprises a urea nozzle located upstream of the first aftertreatment device for injecting urea droplets into the second pipeline.
As a further improved technical solution of the present invention, the first pipeline is provided with an air inlet pipe located at an upstream of the first connecting portion and communicated with the first connecting portion, a connecting pipe located between the first connecting portion and the second connecting portion, and an air outlet pipe located at a downstream of the second connecting portion and communicated with the second connecting portion.
As a further improved technical solution of the present invention, in the first operating mode, the air inlet pipe is communicated with the third connecting portion through the first control valve, the fourth connecting portion is communicated with the connecting pipe through the second control valve, the connecting pipe is communicated with the fifth connecting portion through the first control valve, and the sixth connecting portion is communicated with the air outlet pipe through the second control valve.
As a further improved technical solution of the present invention, in the second operating mode, the air inlet pipe is communicated with the fifth connecting portion through the first control valve, the sixth connecting portion is communicated with the connecting pipe through the second control valve, the connecting pipe is communicated with the third connecting portion through the first control valve, and the fourth connecting portion is communicated with the air outlet pipe through the second control valve.
As a further improved technical scheme of the invention, the first postprocessor is a selective catalytic reduction agent.
As a further improvement of the present invention, the second aftertreatment device is a diesel oxidation catalyst and a diesel particulate trap downstream of the diesel oxidation catalyst.
As a further improved technical scheme of the invention, only one urea nozzle is arranged in the tail gas aftertreatment system.
As a further improved technical solution of the present invention, the second pipeline and the third pipeline are located on both sides of the first pipeline.
Compared with the prior art, the first post-processor is arranged, the trend of the air flow is adjusted through the actuator, the structure of the system is simplified, and the back pressure is reduced.
Drawings
FIG. 1 is a schematic diagram of an exhaust aftertreatment system of the present invention coupled to an engine.
FIG. 2 is a schematic view of the exhaust aftertreatment system of FIG. 1 in a first mode of operation.
FIG. 3 is a schematic view of the exhaust aftertreatment system of FIG. 1 in a second mode of operation.
Detailed Description
Referring to fig. 1 to 3, an exhaust gas aftertreatment system 100 is disclosed, which is used in connection with an engine 200 (e.g., a diesel engine) to purify exhaust gas of the engine 200.
In the illustrated embodiment of the invention, the exhaust gas aftertreatment system 100 comprises a first line 1, a second line 2 and a third line 3. The first pipeline 1 is provided with a first connecting part 11, a second connecting part 12, an air inlet pipe 10 which is positioned at the upstream of the first connecting part 11 and communicated with the first connecting part 11, a connecting pipe 13 which is positioned between the first connecting part 11 and the second connecting part 12, and an air outlet pipe 14 which is positioned at the downstream of the second connecting part 12 and communicated with the second connecting part 12. The intake pipe 10 communicates with an outlet of the engine 200.
The second pipeline 2 is provided with a third connection 21, a fourth connection 22 and a first post-processor 23 communicating between the third connection 21 and the fourth connection 22. The first aftertreatment device 23 is a Selective Catalytic Reduction (SCR).
The third pipeline 3 is provided with a fifth connection 31, a sixth connection 32 and a second post-processor 33 communicating between the fifth connection 31 and the sixth connection 32. The second aftertreatment device 33 is a Diesel Oxidation Catalyst (DOC) and a diesel particulate trap (DPF) located downstream of the Diesel Oxidation Catalyst (DOC).
The first connection portion 11, the third connection portion 21, and the fifth connection portion 31 are connected to form a first junction 101, and the second connection portion 12, the fourth connection portion 22, and the sixth connection portion 32 are connected to form a second junction 102.
The exhaust aftertreatment system 100 further comprises an actuator enabling the exhaust aftertreatment system 100 to be switched between a first operating mode and a second operating mode. In one embodiment of the invention, the actuator comprises a first control valve 4 mounted in the first junction 101 and a second control valve 5 mounted in the second junction 102.
The exhaust aftertreatment system 100 further comprises a urea nozzle 6 located upstream of the first aftertreatment 23 for injecting urea droplets into the second line 2.
Referring to fig. 2, in the first operation mode (for example, when the engine is cold started), referring to the air flow direction indicated by arrows a1 to a9, the air inlet pipe 10 is communicated with the third connection portion 21 through the first control valve 4, the fourth connection portion 22 is communicated with the connection pipe 13 through the second control valve 5, the connection pipe 13 is communicated with the fifth connection portion 31 through the first control valve 4, and the sixth connection portion 32 is communicated with the air outlet pipe 14 through the second control valve 5. This first mode of operation corresponds to the mode when the pre-SCR operates in the prior art, and it can solve the problem of urea crystallization and nox conversion efficiency at cold start and low temperatures.
Referring to fig. 3, in the second operation mode, the air inlet pipe 10 is communicated with the fifth connection portion 31 through the first control valve 4, the sixth connection portion 32 is communicated with the connection pipe 13 through the second control valve 5, the connection pipe 13 is communicated with the third connection portion 21 through the first control valve 4, and the fourth connection portion 22 is communicated with the air outlet pipe 14 through the second control valve 5. The second operation mode is equivalent to a mode in which the main SCR in the related art operates, and the conversion efficiency of the SCR can be improved by using nitrogen dioxide after DOC oxidation.
Compared with the prior art, the exhaust aftertreatment system 100 only needs one set of SCR and one set of urea injection system, so that the structure of the system is simplified, and the back pressure is reduced.
The above embodiments are only for illustrating the invention and not for limiting the technical solutions described in the invention, and the understanding of the present description should be based on the technical personnel in the field, and although the present invention has been described in detail by referring to the above embodiments, the technical personnel in the field should understand that the technical personnel in the field can still make modifications or equivalent substitutions to the present invention, and all technical solutions and modifications thereof without departing from the spirit and scope of the present invention should be covered in the claims of the present invention.

Claims (10)

1. An exhaust gas aftertreatment system is characterized by comprising a first pipeline, a second pipeline and a third pipeline, wherein the first pipeline is provided with a first connecting part and a second connecting part, the second pipeline is provided with a third connecting part, a fourth connecting part and a first aftertreatment device communicated between the third connecting part and the fourth connecting part, and the third pipeline is provided with a fifth connecting part, a sixth connecting part and a second aftertreatment device communicated between the fifth connecting part and the sixth connecting part; the exhaust gas aftertreatment system further comprises an actuator enabling the exhaust gas aftertreatment system to be switched between a first operating mode and a second operating mode, wherein:
in the first working mode, the tail gas firstly passes through the first post-processor and then passes through the second post-processor;
in the second operating mode, the exhaust gas passes through the second post-processor and then passes through the first post-processor.
2. The exhaust aftertreatment system of claim 1, wherein: the first connecting portion, the third connecting portion and the fifth connecting portion are connected to form a first junction portion, the second connecting portion, the fourth connecting portion and the sixth connecting portion are connected to form a second junction portion, and the actuator includes a first control valve installed in the first junction portion and a second control valve installed in the second junction portion.
3. The exhaust aftertreatment system of claim 1, wherein: the exhaust aftertreatment system further includes a urea nozzle located upstream of the first aftertreatment device to inject urea droplets into the second conduit.
4. The exhaust aftertreatment system of claim 2, wherein: the first pipeline is provided with an air inlet pipe, a connecting pipe and an air outlet pipe, wherein the air inlet pipe is located at the upstream of the first connecting portion and communicated with the first connecting portion, the connecting pipe is located between the first connecting portion and the second connecting portion, and the air outlet pipe is located at the downstream of the second connecting portion and communicated with the second connecting portion.
5. The exhaust aftertreatment system of claim 4, wherein: under the first working mode, the air inlet pipe is communicated with the third connecting part through the first control valve, the fourth connecting part is communicated with the connecting pipe through the second control valve, the connecting pipe is communicated with the fifth connecting part through the first control valve, and the sixth connecting part is communicated with the air outlet pipe through the second control valve.
6. The exhaust aftertreatment system of claim 5, wherein: in the second working mode, the air inlet pipe is communicated with the fifth connecting part through the first control valve, the sixth connecting part is communicated with the connecting pipe through the second control valve, the connecting pipe is communicated with the third connecting part through the first control valve, and the fourth connecting part is communicated with the air outlet pipe through the second control valve.
7. The exhaust aftertreatment system of claim 1, wherein: the first aftertreatment device is a selective catalytic reduction agent.
8. The exhaust aftertreatment system of claim 1, wherein: the second aftertreatment device is a diesel oxidation catalyst and a diesel particulate trap located downstream of the diesel oxidation catalyst.
9. The exhaust aftertreatment system of claim 3, wherein: the urea nozzle of the tail gas after-treatment system is only one.
10. The exhaust aftertreatment system of claim 1, wherein: the second pipeline and the third pipeline are positioned on two sides of the first pipeline.
CN202110149120.8A 2021-02-03 2021-02-03 Tail gas aftertreatment system Pending CN114856763A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110149120.8A CN114856763A (en) 2021-02-03 2021-02-03 Tail gas aftertreatment system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110149120.8A CN114856763A (en) 2021-02-03 2021-02-03 Tail gas aftertreatment system

Publications (1)

Publication Number Publication Date
CN114856763A true CN114856763A (en) 2022-08-05

Family

ID=82623537

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110149120.8A Pending CN114856763A (en) 2021-02-03 2021-02-03 Tail gas aftertreatment system

Country Status (1)

Country Link
CN (1) CN114856763A (en)

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