CN115111030A - SCR tail gas aftertreatment hybrid mechanism, SCR tail gas aftertreatment system and vehicle - Google Patents
SCR tail gas aftertreatment hybrid mechanism, SCR tail gas aftertreatment system and vehicle Download PDFInfo
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- CN115111030A CN115111030A CN202111540307.7A CN202111540307A CN115111030A CN 115111030 A CN115111030 A CN 115111030A CN 202111540307 A CN202111540307 A CN 202111540307A CN 115111030 A CN115111030 A CN 115111030A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 70
- 239000004202 carbamide Substances 0.000 claims abstract description 152
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 148
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 6
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 claims 1
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- 238000002347 injection Methods 0.000 description 26
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- 238000010586 diagram Methods 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000006722 reduction reaction Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
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- 230000009471 action Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 239000003638 chemical reducing agent Substances 0.000 description 1
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Images
Classifications
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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
- F01N3/24—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
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
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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]
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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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
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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
- 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
-
- 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
- F01N2610/1486—Means to prevent the substance from freezing
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to the field of exhaust devices, in particular to an SCR tail gas aftertreatment mixing mechanism, an SCR tail gas aftertreatment system and a vehicle. The SCR tail gas aftertreatment mixing mechanism comprises a first pipe body and a second pipe body, wherein the first pipe body comprises a gas inlet end used for gas inlet and a gas outlet end used for being connected with the SCR reaction mechanism; the first fixed end of the second pipe body is used for being connected with the urea nozzle, the second fixed end of the second pipe body is connected with the first pipe body, and the second pipe body is communicated with the first pipe body; the flow guide pipe is sleeved in the second pipe body, one end of the flow guide pipe is connected with the first fixed end, the other end of the flow guide pipe extends into the first pipe body and is close to the air inlet end, and liquid sprayed out of the urea nozzle enters the first pipe body after passing through the flow guide pipe; the clearance between honeycomb duct and the inlet end and the clearance between honeycomb duct and the second body form the water conservancy diversion passageway jointly, and a plurality of air inlets have been seted up to the one end that the honeycomb duct is close to first stiff end, and the water conservancy diversion passageway passes through air inlet intercommunication honeycomb duct. SCR tail gas aftertreatment mixing mechanism has the advantage that crystallization can not appear when using.
Description
Technical Field
The invention relates to the field of exhaust devices, in particular to an SCR tail gas aftertreatment mixing mechanism, an SCR tail gas aftertreatment system and a vehicle.
Background
Vehicles are mainly used for carrying people and/or goods, and are widely used with the development of economy and technology. When the vehicle is used, tail gas can be generated, and the tail gas can generate far-reaching influence on the environment of human life while directly harming human health. The SCR tail gas aftertreatment system selectively reduces nitrogen oxides in tail gas into nitrogen and water which are harmless to the environment in an oxygen-rich environment by using a reducing agent under the action of a catalyst so as to reduce the pollution of the tail gas to the environment. However, the SCR exhaust gas after-treatment system in the prior art has a problem of crystallization when in use, which causes blockage of an exhaust pipe and the like, thereby affecting the treatment effect of the SCR exhaust gas after-treatment system on the exhaust gas.
Disclosure of Invention
In view of the above, the present invention is directed to an SCR exhaust aftertreatment mixing mechanism to solve or partially solve the problem of crystallization of the existing SCR exhaust aftertreatment system during use.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an SCR tail gas aftertreatment mixing mechanism comprises,
the first pipe body comprises an air inlet end for air inlet and an air outlet end for connecting with the SCR reaction mechanism;
the second pipe body comprises a first fixed end and a second fixed end, the first fixed end is used for being connected with the urea nozzle, the second fixed end is connected with the first pipe body, and the second pipe body is communicated with the first pipe body;
the flow guide pipe is sleeved in the second pipe body, one end of the flow guide pipe is connected with the first fixed end, the other end of the flow guide pipe extends into the first pipe body and is close to the air inlet end, and liquid sprayed out of the urea nozzle enters the first pipe body after passing through the flow guide pipe;
the honeycomb duct with clearance between the inlet end and the honeycomb duct with clearance between the second body forms the water conservancy diversion passageway jointly, the honeycomb duct is close to a plurality of air inlets have been seted up to the one end of first stiff end, the water conservancy diversion passageway passes through the air inlet intercommunication the honeycomb duct.
Further, the internal diameter of honeycomb duct is followed certainly first stiff end extremely the direction of first body grow gradually.
Furthermore, one end of the flow guide pipe, which is far away from the first fixed end, is provided with an outward-expanded flanging part, and a gap is formed between the periphery of the flanging part and the air inlet end.
Furthermore, a plurality of through grooves are formed in one end, close to the first fixed end, of the flow guide pipe, notches of the through grooves are sealed by the second pipe body, and the through grooves and the second pipe body jointly form the air inlet.
Further, the SCR tail gas aftertreatment mixing mechanism also comprises,
the cyclone tube is arranged in the first tube body and extends along the axis of the first tube body, a plurality of first crushing channels are formed on the tube wall of the cyclone tube, and the cyclone tube is communicated with the first tube body through the first crushing channels;
the guide plate, with the honeycomb duct is close to the one end periphery of inlet end is connected, the one end of guide plate with the whirl union coupling, the guide plate is used for the inner chamber of honeycomb duct with water conservancy diversion between the inner chamber of whirl pipe.
Further, the cyclone tube comprises a cyclone tube,
the long edge of the first crushing plate is parallel to the axis of the cyclone tube, the first crushing plate is obliquely arranged relative to the cyclone tube, and the two short edges and one long edge of the first crushing plate are connected with the tube wall of the cyclone tube;
and the first opening is arranged corresponding to the first crushing plate, and the first opening and the first crushing plate jointly form the first crushing channel.
Furthermore, a rotational flow through hole is formed in the wall of the rotational flow pipe, and the rotational flow through hole is located at one end, far away from the guide plate, of the first crushing channel.
Furthermore, SCR tail gas aftertreatment mixing mechanism still includes the first perforated plate of annular platelike structure, the inner circle of first perforated plate with the cyclone tube orientation the one end fixed connection of honeycomb duct, the guide plate passes the inner circle sets up, first perforated plate is formed with first through-hole, the periphery of first perforated plate with first body is connected.
Further, SCR tail gas aftertreatment hybrid structure still includes the second perforated plate of disc, the second perforated plate includes inner circle portion, well circle portion and the outer lane portion that connects gradually from inside to outside, the inner circle portion is formed with the second through-hole, well circle portion with the whirl pipe is kept away from the one end of honeycomb duct is connected, outer circle portion is formed with the broken passageway of second, the periphery of second perforated plate with first body is connected.
Further, the second perforated plate further comprises,
one long edge of the second crushing plate extends along the radial direction of the outer ring part and is connected with the outer ring part, the other long edge of the second crushing plate inclines towards the direction far away from the cyclone tube, and a plurality of second crushing plates are uniformly distributed around the axis of the outer ring part;
and the second opening is arranged corresponding to the second crushing plate, and the second opening and the second crushing plate jointly form the second crushing channel.
Compared with the prior art, the SCR tail gas aftertreatment mixing mechanism has the following advantages:
according to the SCR tail gas aftertreatment mixing mechanism disclosed by the invention, the inner cavity of the first pipe body is directly communicated with the inner cavity of the second pipe body, the inner cavity of the first pipe body is directly communicated with the inner cavity of the flow guide pipe, and the inner cavity of the first pipe body is also communicated with the inner cavity of the flow guide pipe through the flow guide channel and the air inlet. The inner cavity of the flow guide pipe is an injection channel of the urea aqueous solution, and the arrangement of the flow guide pipe can guide the injection direction of the urea aqueous solution spray so as to prevent the urea aqueous solution from causing adverse effects on the urea aqueous solution spray due to external air flow in the early injection stage; the arrangement of the flow guide channel and the air inlet can ensure that exhaust airflow enters the inner cavity of the flow guide pipe through the flow guide channel and the air inlet, avoid the occurrence of vortex at the root of the base of the urea nozzle and prevent the occurrence of urea crystallization at the root of the base of the urea nozzle; meanwhile, after the exhaust airflow enters the flow guide channel, the flow guide pipe is heated, so that the urea aqueous solution is in a higher temperature area before being crushed, when the urea aqueous solution is fully mixed with the exhaust airflow, the temperature required by hydrolysis and pyrolysis of the urea aqueous solution is ensured, and the problem of urea aqueous solution crystallization caused by lower temperature due to the contact of the urea aqueous solution with the first pipe body and the second pipe body and the contact of the first pipe body and the second pipe body with the external environment when the flow guide pipe is not arranged can be avoided. Therefore, the SCR tail gas aftertreatment mixing mechanism has the advantage of avoiding crystallization in use.
Another object of the present invention is to provide an SCR exhaust aftertreatment system and a vehicle, so as to solve or partially solve the problem of crystallization of the existing vehicle SCR exhaust aftertreatment system during use.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the SCR tail gas aftertreatment system comprises the SCR tail gas aftertreatment mixing mechanism, a gas inlet assembly, an SCR reaction mechanism and a gas outlet assembly, wherein the gas inlet assembly, the SCR tail gas aftertreatment mixing mechanism, the SCR reaction mechanism and the gas outlet assembly are connected in sequence.
A vehicle comprises the SCR tail gas aftertreatment system.
Compared with the prior art, the SCR tail gas aftertreatment system and the vehicle have the same advantages as the SCR tail gas aftertreatment mixing mechanism, and are not described again.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a mixing mechanism for SCR exhaust aftertreatment according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a draft tube according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a swirl tube and a baffle according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a first perforated plate according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a second perforated plate according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram illustrating distribution of an aqueous urea solution when the SCR exhaust aftertreatment mixing mechanism according to the embodiment of the present invention is in use;
FIG. 7 is a schematic diagram illustrating a crushing principle of an aqueous urea solution when the SCR tail gas aftertreatment mixing mechanism according to the embodiment of the invention is used;
FIG. 8 is a schematic structural diagram of an SCR tail gas aftertreatment system according to an embodiment of the present invention;
FIG. 9 is a mixed cloud of urea aqueous solution in use of the SCR tail gas aftertreatment mixing mechanism without the flow guide pipe;
FIG. 10 is a urea aqueous solution mixing cloud diagram in the use of the SCR tail gas aftertreatment mixing mechanism when the draft tube is arranged.
Description of reference numerals:
1-a first tube; 11-an inlet end cone; 12-a straight tube portion; 13-an expansion section;
2-a second tube; 21-a first fixed end; 22-a second fixed end;
3-a flow guide pipe; 31-flanging part; 32-a through slot;
4-a swirl tube; 41-a first crushing channel; 411-a first breaker plate; 42-swirl through holes; 43-a plug-in projection;
5-a deflector;
6-a first perforated plate; 61-a first via;
7-a second perforated plate; 71-an inner collar portion; 72-a mid-collar portion; 73-an outer ring portion; 74-second via; 75-a second crushing channel; 76-a second breaker plate; 77-plug through hole; 78-a second opening;
81-urea nozzle; 82-an air inlet flange; 83-air inlet connecting pipe; 84-a sensor mount; 85-corrugated pipe; 86-a hook assembly; 87-SCR reaction mechanism; 88-an air outlet end cone; 89-air outlet connecting pipe; 90-an air outlet flange;
91-exhaust gas flow diversion zone; 92-an aqueous urea solution injection zone; 93-an exhaust gas stream main flow region; 94-urea aqueous solution injection path development zone; a 95-urea aqueous solution preliminary mixing zone; a 96-urea aqueous solution uniform mixing area.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, an embodiment of the present application provides an SCR tail gas aftertreatment mixing mechanism, which includes a first pipe 1, a second pipe 2, and a flow guide pipe 3, where the first pipe 1 includes an air inlet end for air intake, and an air outlet end for connecting with an SCR reaction mechanism 87; the second pipe body 2 comprises a first fixed end 21 and a second fixed end 22, the first fixed end 21 is used for being connected with the urea nozzle 81, the second fixed end 22 is connected with the first pipe body 1, and the second pipe body 2 is communicated with the first pipe body 1; the guide pipe 3 is sleeved in the second pipe body 2, one end of the guide pipe 3 is connected with the first fixed end 21, the other end of the guide pipe 3 extends into the first pipe body 1 and is close to the air inlet end, and liquid sprayed by the urea nozzle 81 enters the first pipe body 1 after passing through the guide pipe 3; the clearance between honeycomb duct 3 and the inlet end and the clearance between honeycomb duct 3 and the second body 2 form the water conservancy diversion passageway jointly, and a plurality of air inlets have been seted up to honeycomb duct 3 near the one end of first stiff end 21, and the water conservancy diversion passageway passes through air inlet intercommunication honeycomb duct 3.
Specifically, as shown in fig. 1, the first pipe body 1 is bent and includes an intake end cone 11, a straight pipe portion 12, and an expansion portion 13 connected in this order. The air inlet end cone 11 is an arc-shaped pipe and has a certain bending angle, one end of the air inlet end cone 11, which is far away from the straight pipe part 12, is an air inlet end, and the pipe wall of the air inlet end cone 11 is connected with the second pipe body 2. The straight tube portion 12 has a cylindrical structure. The expanding part 13 is a circular truncated cone-shaped structure, the upper bottom surface end is connected with the straight pipe part 12, the lower bottom surface end is an air outlet end, and the air outlet end is connected with the SCR reaction mechanism 87.
The urea nozzle 81 is fixed on the second tube 2 through the first fixing end 21, and the urea nozzle 81 is used for spraying liquid, in practical application, the liquid generally refers to urea aqueous solution, and the sprayed urea aqueous solution directly enters the flow guide tube 3 and enters the first tube 1 after passing through the flow guide tube 3.
The SCR tail gas aftertreatment mixing mechanism of this application embodiment, the inner chamber of first body 1 and the inner chamber of second body 2 directly communicate, and the inner chamber of first body 1 and the inner chamber of honeycomb duct 3 directly communicate, and the inner chamber of first body 1 still communicates through water conservancy diversion passageway and air inlet and honeycomb duct 3's inner chamber. The inner cavity of the flow guide pipe 3 is an injection channel of the urea aqueous solution, and the arrangement of the flow guide pipe 3 can guide the injection direction of the urea aqueous solution spray so as to prevent the urea aqueous solution from causing adverse effects on the urea aqueous solution spray due to external air flow in the early injection stage; the arrangement of the flow guide channel and the air inlet can ensure that exhaust airflow enters the inner cavity of the flow guide pipe 3 through the flow guide channel and the air inlet, avoid the occurrence of vortex at the root part of the base of the urea nozzle 81 and prevent the occurrence of urea crystallization at the root part of the base of the urea nozzle 81; meanwhile, after the exhaust air flow enters the flow guide channel, the flow guide pipe 3 is heated, the urea aqueous solution can be in a higher temperature area before being crushed, when the urea aqueous solution is fully mixed with the exhaust air flow, the temperature required by hydrolysis and pyrolysis of the urea aqueous solution is ensured, the urea aqueous solution is prevented from contacting with the first pipe body 1 and the second pipe body 2 when the flow guide pipe 3 is not arranged, and the problem of urea aqueous solution crystallization caused by lower temperature due to the contact of the first pipe body 1 and the second pipe body 2 with the external environment can be avoided. Therefore, the SCR tail gas aftertreatment mixing mechanism has the advantage of avoiding crystallization during use.
Referring to fig. 1 and 2, in one embodiment, the inner diameter of the fluid guide tube 3 gradually increases along the direction from the first fixed end 21 to the first tubular body 1.
As shown in fig. 2, the inner diameter of the draft tube 3 gradually increases from the left side to the right side, which is advantageous for guiding the injection direction of the urea aqueous solution spray.
Referring to fig. 1 and 2, in one embodiment, an end of the flow guide tube 3 away from the first fixed end 21 is provided with a flared flange 31, and a gap is formed between the outer periphery of the flange 31 and the air inlet end.
The flanged portion 31 is provided to guide the exhaust air flow in the first pipe body 1 into the guide passage.
The angle of the turn-up portion 31 with respect to the draft tube 3 is set according to the use requirement, and as shown in fig. 2, the turn-up portion 31 may be almost perpendicular to the axis of the draft tube 3.
Referring to fig. 1 and 2, in an embodiment, one end of the flow guide tube 3 near the first fixed end 21 is provided with a plurality of through slots 32, the openings of the through slots 32 are closed by the second tube 2, and the through slots 32 and the second tube 2 together form an air inlet.
Referring to fig. 1 and 2, the first fixed end 21 of the second pipe 2 is welded to the urea nozzle 81, and the first fixed end 21 is welded to the draft tube 3. After the first fixed end 21 and one end of the draft tube 3 are welded, the notch of the through groove 32 and the second tube 2 form an air inlet together.
In an embodiment, as shown with reference to fig. 1 and 2, the draft tube 3 is arranged coaxially with the second tube 2 and the spouting portion of the urea nozzle 81, and the urea nozzle 81 is located at the left side of the draft tube 3.
Referring to fig. 1 and 3, in an embodiment, the SCR tail gas aftertreatment mixing mechanism further includes a cyclone tube 4 and a guide plate 5, the cyclone tube 4 is disposed in the first tube 1 and extends along an axis of the first tube, a plurality of first crushing channels 41 are formed on a wall of the cyclone tube 4, and the cyclone tube 4 is communicated with the first tube through the first crushing channels 41; guide plate 5 and honeycomb duct 3 are close to the one end periphery of inlet end and are connected, and 5 one ends of guide plate are connected with whirl pipe 4, and guide plate 5 is used for the water conservancy diversion between the inner chamber of honeycomb duct 3 and the inner chamber of whirl pipe 4.
When the urea aqueous solution behind the mixed exhaust air current enters into first body 1 through first broken passageway 41 in cyclone tube 4, first broken passageway 41 can carry out the breakage to the urea aqueous solution behind the mixed exhaust air current, reinforcing disturbance intensity, and then increase the mixed effect.
Referring to fig. 1, the swirl tube 4 is disposed in the straight tube portion 12, and the axis of the swirl tube 4 coincides with the axis of the straight tube portion 12.
Referring to fig. 3, the cyclone tube 4 is a cylindrical structure, and a plurality of first crushing channels 41 are uniformly distributed around the axis of the cyclone tube 4. One end of the guide plate 5 is connected with the cyclone tube 4, and the other end of the guide plate extends to the first tube body 1 and is connected with the first tube body 1.
In practical application, the cyclone tube 4 and the guide plate 5 can be integrally formed, and can also be connected by welding and the like. The guide plate 5 and the first pipe body 1 can adopt a welding connection mode. And the guide plate 5 is connected with the first pipe body 1, so that the fixing effect on the guide pipe 3 can be improved.
Referring to fig. 1 and 3, in one embodiment, the baffle 5 is an arc-shaped plate-shaped structure fitted to the outer periphery of one end of the draft tube 3 near the air inlet end, and is located at the lower side of the draft tube 3. That is, the shape of the baffle 5 is adapted to the shape of the periphery of the flanging part 31 of the draft tube 3, so that the baffle 5 is effectively connected with the periphery of the flanging part 31, and the baffle 5 is effectively fixed to the draft tube 3.
Referring to fig. 1 and 3, in an embodiment, the cyclone tube 4 includes a first breaker plate 411 and a first opening, a long side of the first breaker plate 411 is parallel to an axis of the cyclone tube 4, the first breaker plate 411 is disposed obliquely with respect to the cyclone tube 4, and two short sides and one long side of the first breaker plate 411 are connected to a tube wall of the cyclone tube 4; a first opening is provided in correspondence with the first crushing plate 411, which first opening together with the first crushing plate 411 forms a first crushing channel 41.
The wall of the swirl tube 4 may be formed with the first breaker plate 411 and the first opening at the same time during the press working. Or a welded connection mode, that is, the cyclone tube 4 is welded to the first breaker plate 411.
Referring to fig. 1 and 3, in an embodiment, a swirl flow hole 42 is formed in a wall of the swirl tube 4, and the swirl flow hole 42 is located at an end of the first crushing channel 41 far away from the baffle 5.
The swirl through holes 42 are mainly used to reduce exhaust back pressure.
As shown in fig. 3, the swirl through-holes 42 are oblong holes, and the swirl through-holes 42 are arranged around the axis of the swirl tube 4. It is understood that, in practical applications, the shape and number of the swirl through holes 42 may be adjusted accordingly, which is not limited in the embodiments of the present invention.
Referring to fig. 1 and 4, in an embodiment, the SCR exhaust aftertreatment mixing mechanism further includes a first perforated plate 6 having an annular plate-like structure, an inner ring of the first perforated plate 6 is fixedly connected to one end of the cyclone tube 4 facing the flow guide tube 3, the flow guide plate 5 penetrates through the inner ring, the first perforated plate 6 is formed with a first through hole 61, and an outer periphery of the first perforated plate 6 is connected to the first tube 1.
First perforated plate 6 can fix cyclone tube 4, and exhaust air current and urea aqueous solution most enter into cyclone tube 4 through the inner circle of first perforated plate 6 in, and exhaust air current and urea aqueous solution part still can enter into the clearance between cyclone tube 4 and first body 1 through first through-hole 61.
Referring to fig. 1 and 5, in an embodiment, the SCR exhaust aftertreatment mixing mechanism further includes a second perforated plate 7 in a circular plate shape, the second perforated plate 7 includes an inner ring portion 71, a middle ring portion 72, and an outer ring portion 73 that are sequentially connected from inside to outside, the inner ring portion 71 is formed with a second through hole 74, the middle ring portion 72 is connected to one end of the cyclone tube 4 away from the draft tube 3, the outer ring portion 73 is formed with a second crushing channel 75, and the outer periphery of the second perforated plate 7 is connected to the first tube 1.
The second perforated plate 7 can fix the cyclone tube 4, and connects the cyclone tube 4 with the first pipe body 1. The second crushing passage 75 is used for secondarily crushing the mixed urea aqueous solution, and the second through hole 74 reduces the back pressure in the cyclone tube 4.
Referring to fig. 1 and 5, in an embodiment, the inner ring portion 71 has an arc-shaped structure, and protrudes toward the inner cavity of the swirl tube 4, and is arranged coaxially with the swirl tube 4. In practical applications, the inner ring portion 71 is formed by stamping and has a second through hole 74.
Referring to fig. 5, the second through holes 74 are circular holes, and it is understood that, in practical applications, the shape and number of the second through holes 74 may be adjusted accordingly, which is not limited in the embodiment of the present invention.
Referring to fig. 3 and 5, in an embodiment, an insertion protrusion 43 is disposed at one end of the right side of the cyclone tube 4, an insertion through hole 77 is disposed in the middle ring part 72 of the second perforated plate 7, and the insertion protrusion 43 is correspondingly inserted into the insertion through hole 77 during the connection process between the cyclone tube 4 and the second perforated plate 7.
Referring to fig. 1 and 5, in an embodiment, the second perforated plate 7 further includes a second crushing plate 76 and a second opening, one long side of the second crushing plate 76 extends in a radial direction of the outer ring portion 73 and is connected to the outer ring portion 73, the other long side of the second crushing plate 76 is inclined in a direction away from the cyclone tube 4, and a plurality of the second crushing plates 76 are arranged uniformly around an axis of the outer ring portion 73; a second opening is provided in correspondence with the second crushing plate 76, which second opening together with the second crushing plate 76 forms a second crushing channel 75.
A plurality of second crushing plates 76 are uniformly arranged around the axis of the outer ring portion 73, and the free ends of the second crushing plates 76 point to different directions, respectively, for secondarily crushing the mixed urea aqueous solution.
In practical applications, the second perforated plate 7 may form the second breaker plate 76 and the second opening at the same time during the punching process. The second perforated plate 7 and the second breaker plate 76 may be welded together.
In an embodiment, the included angle between the second crushing plate 76 and the outer ring portion 73 is 45 degrees, and it can be understood that, in practical applications, the included angle between the second crushing plate 76 and the outer ring portion 73 can be set according to the use requirement, and the embodiment of the present application is not limited.
In the SCR exhaust gas aftertreatment mixing mechanism in the embodiment of the present application, according to the distribution of the urea aqueous solution, the SCR exhaust gas aftertreatment mixing mechanism may be divided into 6 regions, and as shown in fig. 6, the 6 regions are an exhaust gas flow diversion region 91, a urea aqueous solution injection region 92, an exhaust gas flow main region 93, a urea aqueous solution injection path development region 94, a urea aqueous solution primary mixing region 95, and a urea aqueous solution uniform mixing region 96, respectively.
The exhaust gas flow guiding area 91 is an area formed by the second pipe 2, the air inlet end cone 11 of the first pipe 1, the flow guiding pipe 3 and the flow guiding plate 5, and is used for guiding the gas flow of the first pipe 1 into the urea aqueous solution injection area 92 through the exhaust gas flow guiding area 91. Because the outer wall surface of the air inlet end cone 11 and the outer wall of the second pipe body 2 are in direct contact with the external environment, the temperature of the inner wall surface of the air inlet end cone 11 and the temperature of the outer wall surface of the second pipe body 2 are lower; the exhaust air flow guided and guided from the first pipe body 1 has a certain temperature, and the exhaust air flow can keep the temperature of the urea aqueous solution in the flow guide pipe 3 when being in the exhaust air flow guiding area 91, so that the problem of urea crystallization caused by the fact that the initially-injected urea aqueous solution directly contacts the second pipe body 2 with lower temperature and the wall surface of the air inlet end cone 11 is avoided. In the initial injection stage of the urea aqueous solution, the diameter of the urea aqueous solution is large, and if the wall surface with low contact temperature is relatively easy to generate urea crystallization.
The urea aqueous solution injection area 92 is conical and radial, and comprises an area formed by the guide pipe 3 and the urea nozzle 81, the urea aqueous solution injection area 92 is used for guiding the injection development of the urea aqueous solution and mixing part of air flow introduced into the guide pipe 3 by an air inlet with the urea aqueous solution, so that the problem of urea crystallization caused by the dead zone of the second pipe body 2 when the guide pipe 3 is not arranged is avoided, and the problem of urea crystallization caused by the fact that the initially injected urea aqueous solution directly contacts the wall surface of the second pipe body 2 with lower temperature and the air inlet end cone 11 is avoided.
The main flow region 93 of the exhaust gas flow, which is the region formed by the inlet end cone 11, the draft tube 3, the first perforated plate 6, and the baffle 5, is the main region where the exhaust gas flow exists. A small part of the exhaust gas flow entering from the upstream of the inlet end cone 11 enters the exhaust gas flow main flow area 93 through the exhaust gas flow guiding area 91 and the urea aqueous solution injection area 92, and most of the exhaust gas flow directly enters the exhaust gas flow main flow area 93. The urea aqueous solution is sprayed out from the urea aqueous solution spraying area 92 and then enters the exhaust gas flow main area 93, and is positioned on the upper side of the guide plate 5; the exhaust air flow main flow area 93 on the lower side of the guide plate 5 is in direct contact with the exhaust air flow, and the temperature of the wall surface of the guide plate 5 is higher, so that the problem of urea crystallization caused by temperature reduction after the urea aqueous solution is in contact with the wall surface in direct contact with the environment is avoided. Most of the urea aqueous solution directly enters the urea aqueous solution injection path development section 94 through the exhaust gas flow main flow section 93, and a small part of the urea aqueous solution enters the urea aqueous solution preliminary mixing section 95 through the first through holes 61 in the first perforated plate 6 due to the disturbance of the exhaust gas flow.
The urea aqueous solution injection path development area 94 is an area formed by the first perforated plate 6, the cyclone tube 4 and the second perforated plate 7, and is mainly used for the free development of the urea aqueous solution, and is subjected to cyclone crushing through the first crushing channel 41, so that the sufficient mixing of the urea aqueous solution and the exhaust air flow is enhanced, and the disturbance intensity of the urea aqueous solution is increased. Urea aqueous solution mist gets into the preliminary mixed zone 95 of urea aqueous solution through first broken passageway 41, and this region has the exhaust flow who gets into through first perforated plate 6 by exhaust flow mainstream district 93, and the higher temperature that makes cyclone tube 4 outer wall surface temperature of exhaust flow is higher to guaranteed the uniformity of urea aqueous solution injection route development district 94 and the preliminary mixed zone 95 inside and outside temperature of urea aqueous solution, avoided because of the too big emergence that arouses the urea crystallization problem of temperature gradient difference.
The urea aqueous solution preliminary mixing area 95 is an area formed by the first perforated plate 6, the swirl tube 4, the straight tube portion 12 of the first pipe body 1, and the second perforated plate 7, and is used for preliminary mixing of the urea aqueous solution and the exhaust gas flow. The urea aqueous solution preliminary mixing section 95 includes the exhaust gas flow entering from the exhaust gas flow main flow section 93 and a small amount of urea aqueous solution, and a mixed gas flow of a large amount of urea aqueous solution and the exhaust gas flow entering from the urea aqueous solution injection path development section 94 through the first crushing passage 41. The mixed gas entering through the exhaust gas main flow area 93 flows horizontally and uniformly, and the mixed gas entering through the urea aqueous solution injection path development area 94 and the first crushing channel 41 flows in a swirling manner, so that the further mixing of the mixed gas in the urea aqueous solution primary mixing area 95 is enhanced, and the disturbance intensity of the mixed gas of the urea aqueous solution is increased.
The urea aqueous solution uniform mixing area 96 is an area formed by the straight pipe part 12 and the expanding part 13 of the first pipe body 1, the second perforated plate 7 and the SCR reaction mechanism 87, most of the urea aqueous solution and the exhaust gas flow in the urea aqueous solution injection path development area 94 enter the urea aqueous solution primary mixing area 95 through the first crushing channel 41, then enter the urea aqueous solution uniform mixing area 96 after being secondarily crushed through the second crushing channel 75 of the second perforated plate 7, and the crushed urea aqueous solution is basically and completely pyrolyzed into ammonia gas; a small part of the urea aqueous solution and the exhaust gas flow in the urea aqueous solution injection path development area 94 directly enter the urea aqueous solution uniform mixing area 96 through the second through holes 74 on the second perforated plate 7, and after the urea aqueous solution and the exhaust gas flow are fully mixed in the urea aqueous solution uniform mixing area 96, the mixed gas uniformly flows to the SCR reaction mechanism 87 to participate in the reduction reaction of the nitrogen oxide.
Use honeycomb duct 3, first perforated plate 6, cyclone tube 4, second perforated plate 7 and guide plate 5 to divide SCR tail gas aftertreatment mixing mechanism's inside into a plurality of regions for exhaust air flow heat can make full use of, hydrolysis pyrolysis in-process avoids with external environment wall direct contact at urea aqueous solution, has effectively avoided the urea crystallization problem because of temperature variation leads to take place. The SCR tail gas aftertreatment mixing mechanism can realize full hydrolysis and pyrolysis reaction of urea aqueous solution, generate ammonia so as to meet urea injection control strategies under various working conditions of a diesel engine, and has great influence on reduction of pollutant emission.
The urea aqueous solution crushing principle in the SCR exhaust gas aftertreatment mixing mechanism in the embodiment of the present application is shown in fig. 7, where solid arrows represent exhaust gas flows, and dotted arrows represent urea aqueous solution spray.
After the exhaust gas flow enters the SCR tail gas aftertreatment mixing mechanism, the urea nozzle 81 judges whether to spray urea aqueous solution according to the specific working condition of the diesel engine, if the urea aqueous solution is sprayed, the urea aqueous solution is sprayed out through the urea nozzle 81 and is in a conical shape, and at the moment, part of the exhaust gas flow enters the urea aqueous solution spraying area 92 through the air inlet of the guide pipe 3, so that the initial mixing of the urea aqueous solution and the exhaust gas flow is realized.
Exhaust gas flow gets into the preliminary mixing of urea aqueous solution district 95 through first through-hole 61 of first perforated plate 6, and exhaust gas flow gets into urea aqueous solution injection route development district 94 from the inner circle of first perforated plate 6 after converging with urea aqueous solution, and the preliminary mixing of urea aqueous solution district 95 is got into through the first broken passageway 41 of cyclone tube 4 again.
Most of the mixed gas of the exhaust gas flow and the urea aqueous solution enters the urea aqueous solution uniform mixing area 96 through the second crushing channel 75 of the second perforated plate 7, and a small part of the mixed gas enters the urea aqueous solution uniform mixing area 96 through the second through hole 74 at the center of the second perforated plate 7, and the mixed gas uniformly mixed in the urea aqueous solution uniform mixing area 96 enters the SCR reaction mechanism 87 to participate in the reduction reaction.
Fig. 9 shows a urea aqueous solution mixture cloud when the draft tube 3 is not provided, and fig. 10 shows a urea aqueous solution mixture cloud when the draft tube 3 is provided. The result of the urea aqueous solution mixed cloud chart shows that: in fig. 9, the velocity vector cloud of the cross section of the urea spray shows that the velocity direction is directed to the urea spray direction and opposite to the urea spray direction, which is likely to form a vortex at the root of the base of the urea nozzle 81, thereby causing the problem of urea crystallization. In fig. 10, the velocity vector cloud chart of the cross section of the urea spray shows that the velocity directions all point to the urea spray direction, and the velocity consistency is good, so that the formation of a vortex region at the root of the base of the urea nozzle 81 can be effectively avoided, and further, the problem of urea crystallization at the root of the base of the urea nozzle 81 can be avoided.
Referring to fig. 8, an embodiment of the present invention further provides an SCR tail gas aftertreatment system, which may specifically include the SCR tail gas aftertreatment mixing mechanism, an air inlet assembly, an SCR reaction mechanism 87, and an air outlet assembly, where the air inlet assembly, the SCR tail gas aftertreatment mixing mechanism, the SCR reaction mechanism 87, and the air outlet assembly are sequentially connected.
Referring to fig. 8, in one embodiment, the inlet assembly includes an inlet flange 82, an inlet connection pipe 83, and a bellows 85 connected in sequence, and the outlet assembly includes an outlet end cone 88, an outlet connection pipe 89, and an outlet flange 90 connected in sequence. That is, the SCR tail gas aftertreatment system specifically includes an air inlet flange 82, an air inlet connecting pipe 83, a corrugated pipe 85, an SCR tail gas aftertreatment mixing mechanism, an SCR reaction mechanism 87, an air outlet end cone 88, an air outlet connecting pipe 89 and an air outlet flange 90, which are connected in sequence.
Wherein the inlet flange 82 is connected to the particle catch for fixation. The corrugated pipe 85 is connected with the first pipe body 1, and the corrugated pipe 85 is used for absorbing vibration energy of an exhaust system, reducing vibration transmitted to a vehicle body and avoiding the problems of noise, vibration and sound vibration roughness of a passenger compartment. The outlet flange 90 is connected to the muffler for fixing.
The urea nozzle 81 is used to inject an aqueous urea solution. The SCR tail gas aftertreatment mixing mechanism is used for fully mixing urea aqueous solution with exhaust gas flow. The SCR reaction mechanism 87 is a device in which a urea aqueous solution and an exhaust gas flow undergo a reduction reaction, and the urea aqueous solution is hydrolyzed and pyrolyzed to generate ammonia gas, which is mixed with the exhaust gas flow and then undergoes a reduction reaction in the SCR reaction mechanism 87 to generate nitrogen gas and water.
The SCR tail gas aftertreatment system further includes a sensor base 84, and the sensor base 84 is connected to both ends of the air inlet connection pipe 83, the SCR tail gas aftertreatment mixing mechanism, and the air outlet connection pipe 89, respectively. The sensor mount 84 is used to connect various sensors to collect various exhaust aftertreatment signals to implement a diesel engine electronic control strategy signal closed loop.
The SCR tail gas aftertreatment system also comprises a hook assembly 86, wherein the hook assembly 86 is used for being connected with the vehicle body or the vehicle frame and hoisting the SCR tail gas aftertreatment system, so that the SCR tail gas aftertreatment system is firmly and stably connected with the vehicle body or the vehicle frame.
The embodiment of the invention also provides a vehicle which specifically comprises the SCR tail gas after-treatment system.
SCR tail gas aftertreatment hybrid mechanisms are used in SCR tail gas aftertreatment systems and vehicles, so that the SCR tail gas aftertreatment hybrid mechanisms have the advantage that crystallization cannot occur in use.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. An SCR tail gas aftertreatment mixing mechanism is characterized by comprising,
the first pipe body (1) comprises an air inlet end for air inlet and an air outlet end for connecting with the SCR reaction mechanism (87);
the second pipe body (2) comprises a first fixing end (21) and a second fixing end (22), the first fixing end (21) is used for being connected with the urea nozzle (81), the second fixing end (22) is connected with the first pipe body (1), and the second pipe body (2) is communicated with the first pipe body (1);
the guide pipe (3) is sleeved in the second pipe body (2), one end of the guide pipe (3) is connected with the first fixed end (21), the other end of the guide pipe extends into the first pipe body (1) and is close to the air inlet end, and liquid sprayed by the urea nozzle (81) enters the first pipe body (1) after passing through the guide pipe (3);
honeycomb duct (3) with clearance between the inlet end and honeycomb duct (3) with clearance between second body (2) forms the water conservancy diversion passageway jointly, honeycomb duct (3) are close to a plurality of air inlets have been seted up to the one end of first stiff end (21), the water conservancy diversion passageway passes through the air inlet intercommunication honeycomb duct (3).
2. The SCR exhaust gas aftertreatment mixing mechanism of claim 1, wherein the inner diameter of the flow guide pipe (3) becomes gradually larger in a direction from the first fixed end (21) to the first pipe body (1).
3. The SCR exhaust aftertreatment mixing mechanism of claim 2, wherein one end of the draft tube (3) away from the first fixed end (21) is provided with a flared flanging part (31), and a gap is formed between the periphery of the flanging part (31) and the air inlet end.
4. The SCR exhaust gas aftertreatment mixing mechanism of claim 1, wherein the draft tube (3) is provided with a plurality of through slots (32) at one end close to the first fixed end (21), the slots of the through slots (32) are closed by the second tube (2), and the through slots (32) and the second tube (2) together form the air inlet.
5. The SCR exhaust aftertreatment mixing mechanism of claim 1, further comprising,
the cyclone tube (4) is arranged in the first tube body (1) and extends along the axis of the first tube body, a plurality of first crushing channels (41) are formed on the tube wall of the cyclone tube (4), and the cyclone tube (4) is communicated with the first tube body through the first crushing channels (41);
guide plate (5), with honeycomb duct (3) are close to the one end periphery of inlet end is connected, the one end of guide plate (5) with whirl pipe (4) are connected, guide plate (5) are used for the inner chamber of honeycomb duct (3) with water conservancy diversion between the inner chamber of whirl pipe (4).
6. SCR exhaust gas aftertreatment mixing arrangement according to claim 5, wherein the swirl tube (4) comprises,
the long edge of the first crushing plate (411) is parallel to the axis of the cyclone tube (4), the first crushing plate (411) is obliquely arranged relative to the cyclone tube (4), and two short edges and one long edge of the first crushing plate (411) are connected with the tube wall of the cyclone tube (4);
a first opening provided in correspondence of said first breaker plate (411), said first opening forming together with said first breaker plate (411) said first breaker channel (41).
7. The SCR exhaust aftertreatment mixing mechanism of claim 5,
and a swirling flow hole (42) is formed in the wall of the swirling flow pipe (4), and the swirling flow hole (42) is positioned at one end, far away from the guide plate (5), of the first crushing channel (41).
8. The SCR exhaust aftertreatment mixing mechanism of claim 5, further comprising a first perforated plate (6) in an annular plate-shaped structure, wherein an inner ring of the first perforated plate (6) is fixedly connected with one end, facing the flow guide pipe (3), of the swirl pipe (4), the flow guide plate (5) penetrates through the inner ring, the first perforated plate (6) is formed with a first through hole (61), and the periphery of the first perforated plate (6) is connected with the first pipe body (1).
9. The SCR tail gas aftertreatment mixing mechanism of claim 5, characterized in that, SCR tail gas aftertreatment mixing mechanism still includes discoid second perforated plate (7), second perforated plate (7) include from inside to outside in proper order connect's inner circle portion (71), well circle portion (72) and outer lane portion (73), inner circle portion (71) is formed with second through-hole (74), well circle portion (72) with whirl pipe (4) are kept away from the one end of honeycomb duct (3) and are connected, outer lane portion (73) are formed with broken passageway (75) of second, the periphery of second perforated plate (7) with first body (1) is connected.
10. The SCR exhaust gas aftertreatment mixing mechanism of claim 9, wherein the second perforated plate (7) further comprises,
a second crushing plate (76), one long edge of the second crushing plate (76) extends along the radial direction of the outer ring part (73) and is connected with the outer ring part (73), the other long edge of the second crushing plate (76) inclines towards the direction far away from the cyclone tube (4), and a plurality of second crushing plates (76) are uniformly distributed around the axis of the outer ring part (73);
a second opening provided in correspondence of the second crushing plate (76), the second opening and the second crushing plate (76) together forming the second crushing channel (75).
11. An SCR exhaust aftertreatment system, comprising the SCR exhaust aftertreatment mixing mechanism of any one of claims 1 to 10, and an air inlet assembly, an SCR reaction mechanism (87) and an air outlet assembly, wherein the air inlet assembly, the SCR exhaust aftertreatment mixing mechanism, the SCR reaction mechanism (87) and the air outlet assembly are connected in sequence.
12. A vehicle comprising the SCR exhaust aftertreatment system of claim 11.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111540307.7A CN115111030A (en) | 2021-12-16 | 2021-12-16 | SCR tail gas aftertreatment hybrid mechanism, SCR tail gas aftertreatment system and vehicle |
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| CN202111540307.7A CN115111030A (en) | 2021-12-16 | 2021-12-16 | SCR tail gas aftertreatment hybrid mechanism, SCR tail gas aftertreatment system and vehicle |
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