CN112412589A - Mixing chamber subassembly and tail gas aftertreatment encapsulation - Google Patents

Mixing chamber subassembly and tail gas aftertreatment encapsulation Download PDF

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Publication number
CN112412589A
CN112412589A CN202011288635.8A CN202011288635A CN112412589A CN 112412589 A CN112412589 A CN 112412589A CN 202011288635 A CN202011288635 A CN 202011288635A CN 112412589 A CN112412589 A CN 112412589A
Authority
CN
China
Prior art keywords
cavity
mixing
assembly
port
mixing chamber
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
CN202011288635.8A
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Chinese (zh)
Inventor
严才宝
凌睿
叶威
王长林
郑鑫
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.)
Tenneco Suzhou Emission System Co Ltd
Original Assignee
Tenneco Suzhou Emission 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 Tenneco Suzhou Emission System Co Ltd filed Critical Tenneco Suzhou Emission System Co Ltd
Priority to CN202011288635.8A priority Critical patent/CN112412589A/en
Publication of CN112412589A publication Critical patent/CN112412589A/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
    • F01N3/24—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
    • 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
    • F01N13/009—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 separate purifying devices arranged in series
    • 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
    • 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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

A mixing chamber assembly includes a mixing chamber housing and a mixing tube assembly. The mixing chamber shell is provided with a first cavity and a second cavity. The mixing tube assembly comprises a swirl tube, a baffle connected with the swirl tube and a cone for accommodating the baffle. The baffle is provided with a plurality of air flow through holes. The cone is provided with a first port and a second port, wherein the first port is used for installing the baffle, the second port is communicated with the second cavity, and the area of the first port is larger than that of the second port. The invention also discloses an exhaust aftertreatment component comprising the mixing cavity component. Compared with the prior art, the volume of the mixing cavity for mixing the tail gas and the urea liquid drops is increased by arranging the cone, the tail gas with higher temperature is introduced into the mixing cavity through the airflow through holes in the baffle, and the anti-crystallization capacity is improved.

Description

Mixing chamber subassembly and tail gas aftertreatment encapsulation
Technical Field
The invention relates to a mixing cavity assembly and an exhaust aftertreatment package, and belongs to the technical field of engine exhaust aftertreatment.
Background
Studies have shown that the degree of uniformity of ammonia distribution in the lines of an exhaust aftertreatment system (e.g., a selective catalytic reduction system, SCR system) has a significant impact on the overall performance and durability of the system. The uneven distribution of ammonia over time can result in uneven catalyst aging, thereby affecting the overall performance of the catalyst. In addition, the uneven distribution of urea liquid drops can cause that the temperature of a local pipe wall or a mixed structure is too low, crystals are formed, and a tail gas pipe is blocked when the temperature is serious, so that the power performance of an engine is reduced.
Disclosure of Invention
The invention aims to provide a mixing cavity assembly with good urea crystallization resistance and an exhaust aftertreatment package.
In order to achieve the purpose, the invention adopts the following technical scheme: a mixing cavity assembly comprises a mixing cavity shell and a mixing tube assembly arranged in the mixing cavity shell, wherein the mixing cavity shell is provided with a first opening communicated with a first post-processing carrier assembly, a second opening communicated with a second post-processing carrier assembly, a first cavity communicated with the first opening and a second cavity communicated with the second opening; the mixing pipe assembly comprises a cyclone pipe positioned in the first cavity, a baffle plate positioned in the first cavity and connected with the cyclone pipe, and a cone positioned in the first cavity and used for accommodating the baffle plate; the cyclone tube is provided with a first inner cavity, a plurality of cyclone plates and an airflow inlet corresponding to the cyclone plates, and the first inner cavity is communicated with the first cavity through the airflow inlet; the baffle is provided with a plurality of airflow through holes, the cone is provided with a first port and a second port, the first port is used for installing the baffle, the second port is communicated with the second cavity, and the area of the first port is larger than that of the second port.
As a further improved technical scheme of the invention, the mixing cavity shell is provided with a mounting seat for mounting a urea nozzle, and the urea nozzle is used for spraying atomized urea liquid drops into the cyclone tube.
As a further improved technical scheme of the invention, the mixing cavity shell is provided with a partition plate positioned between the first cavity and the second cavity.
As a further improvement of the present invention, the mixing tube assembly includes a connecting tube connected to the second port, the connecting tube extending into the second cavity.
As a further improved technical scheme of the invention, the pipe wall of the connecting pipe is provided with a plurality of airflow perforations.
As a further improved technical solution of the present invention, the mixing chamber assembly includes an end assembly located in the second chamber and at the bottom of the connecting pipe, and the end assembly includes a bottom wall, a peripheral wall extending upward from the periphery of the bottom wall, and a buffer chamber enclosed by the bottom wall and the peripheral wall.
As a further development of the invention, the circumferential wall is provided with a first side wall facing the second aftertreatment carrier assembly, the first side wall being provided with a number of first gas flow perforations through which a gas flow flows.
As a further improvement of the present invention, the mixing tube assembly includes a urea break tube located in the first inner cavity.
The invention also discloses an exhaust aftertreatment package which comprises a first aftertreatment carrier component, a second aftertreatment carrier component, a third aftertreatment carrier component positioned at the upstream of the first aftertreatment carrier component and a mixing cavity component for connecting the first aftertreatment carrier component and the second aftertreatment carrier component, wherein the first aftertreatment carrier component is a diesel particle trap, the second aftertreatment carrier component is a selective catalytic reducing agent, the third aftertreatment carrier component is a diesel oxidation catalyst, and the mixing cavity component is the mixing cavity component.
Compared with the prior art, the volume of the mixing cavity for mixing the tail gas and the urea liquid drops is increased by arranging the cone, the tail gas with higher temperature is introduced into the mixing cavity through the airflow through holes in the baffle, and the anti-crystallization capacity is improved.
Drawings
FIG. 1 is a schematic view of an exhaust aftertreatment package of the present invention.
FIG. 2 is a perspective view of a mixing chamber assembly of the present invention in one embodiment.
Fig. 3 is a partially exploded perspective view of fig. 2.
Fig. 4 is a perspective view of the mixing chamber housing of fig. 2 removed.
Fig. 5 is an exploded perspective view of fig. 4.
Fig. 6 is a schematic sectional view taken along line a-a in fig. 2.
Detailed Description
Referring to fig. 1, the present invention discloses an exhaust gas aftertreatment package, which includes a first aftertreatment carrier assembly 1, a second aftertreatment carrier assembly 2, a third aftertreatment carrier assembly 3 located upstream of the first aftertreatment carrier assembly 1, and a mixing chamber assembly 4 connecting the first aftertreatment carrier assembly 1 and the second aftertreatment carrier assembly 2. In one embodiment of the invention, the first aftertreatment carrier component 1 is a diesel particulate trap (DPF), the second aftertreatment carrier component 2 is a Selective Catalytic Reduction (SCR) and the third aftertreatment carrier component 3 is a Diesel Oxidation Catalyst (DOC).
Referring to fig. 2 to 6, in the illustrated embodiment of the present invention, the mixing chamber assembly 4 includes a mixing chamber housing 5 and a mixing tube assembly 6 installed in the mixing chamber housing 5. The mixing chamber housing 5 is provided with a first opening 51 for communicating with a first aftertreatment carrier assembly 1, a second opening 52 for communicating with a second aftertreatment carrier assembly 2, a first cavity 53 communicating with the first opening 51, a second cavity 54 communicating with the second opening 52, and a partition 55 between the first cavity 53 and the second cavity 54.
The mixing tube assembly 6 comprises a cyclone tube 61 in the first cavity 53, a baffle plate 68 in the first cavity 53 and connected to the cyclone tube 61, a cone 69 in the first cavity 53 for accommodating the baffle plate 68, a connecting tube 62 connected to the cone 69 and extending into the second cavity 54, a urea breaking tube 64 in the cyclone tube 61, and a urea breaking plate 65 fixed to the bottom of the connecting tube 62.
The cyclone tube 61 is provided with a first inner cavity 611, a plurality of cyclones 612 and an air inlet 613 corresponding to the cyclones 612. The first inner cavity 611 communicates with the first cavity 53 through the gas flow inlet 613.
The baffle 68 is provided with a plurality of air flow holes 681 for introducing the exhaust gas having a relatively high temperature into the cone 69.
The cone 69 is provided with a first port 691 and a second port 692, wherein the first port 691 is used for mounting the baffle 68, the second port 692 is communicated with the second cavity 54, and the area of the first port 691 is larger than that of the second port 692.
The connecting pipe 62 is provided with a second inner cavity 621 communicated with the first inner cavity 611, and the second inner cavity 621 is communicated with the second cavity 54. The wall of the connecting tube 62 is provided with a plurality of air flow perforations 622.
The mixing chamber shell 5 is provided with a mounting seat 531 for mounting a urea nozzle 7, and the urea nozzle 7 is used for spraying atomized urea liquid drops into the cyclone tube 61.
In addition, the mixing chamber assembly 4 includes an end assembly 8 located within the second chamber 54 and at the bottom of the connecting tube 62. The end assembly 8 is substantially "boat-shaped". The end assembly 8 includes a bottom wall 81, a peripheral wall 82 extending upwardly from the periphery of the bottom wall 81, and a buffer chamber 83 defined by the bottom wall 81 and the peripheral wall 82. The peripheral wall 82 is provided with a first side wall 821 facing the second aftertreatment carrier assembly 2, a second side wall 822 disposed opposite to the first side wall 821, a first arc-shaped wall 823 between the first side wall 821 and the second side wall 822, and a second arc-shaped wall 824. The first side wall 821 is provided with a plurality of first flow apertures 825 for allowing a mixed flow of off-gas and urea droplets to pass therethrough, thereby facilitating the direction of the mixed flow towards the end face of the downstream second aftertreatment carrier assembly 2. The second side wall 822 is not perforated to avoid dead space by the mixture flow to the side away from the second aftertreatment carrier assembly 2. The first and second curved walls 823, 824 are configured to swirl the mixed gas flow, thereby increasing the mixing distance and enhancing the evaporation of urea droplets. Preferably, the bottom wall 81 is inclined, and one end of the bottom wall 81 close to the first side wall 821 is lower than one end close to the second side wall 822; with this arrangement, even if a liquid film is formed, the liquid film flows out to the second aftertreatment support element 2 side along the inclined bottom wall 81, thereby preventing urea crystallization due to continuous accumulation of the liquid film. Preferably, the bottom of the first side wall 821 is provided with a diversion channel 826 to facilitate the liquid to flow out; meanwhile, the guide groove 826 can also adjust the uniformity of the mixed air flow when the mixed air flow flows out of the buffer cavity 83.
In addition, the mixing chamber assembly 4 may further include a regulating plate 84 disposed in the buffer chamber 83, and the regulating plate 84 is provided with a plurality of through holes 841, so that further crushing of the urea droplets can be performed. The adjusting plate 84 has a bottom 842, wherein an end of the bottom 842 near the first side wall 821 is lower than an end near the second side wall 822. With this arrangement, even if a liquid film is formed, the liquid film flows out to the second aftertreatment support element 2 side along the inclined bottom 842, thereby preventing urea crystallization due to continuous accumulation of the liquid film.
The mixing chamber assembly 4 is further provided with a gas flow distribution plate 85, the gas flow distribution plate 85 is provided with a plurality of second gas flow perforations 851, and the gas flow distribution plate 85 and the first side wall 821 are located on the same side of the buffer chamber 83. So configured, the mixed gas flow of the exhaust gas and the urea droplets can pass through the first gas flow perforation 825 and the second gas flow perforation 851, thereby facilitating the uniform distribution of the mixed gas flow on the end face of the second aftertreatment carrier assembly 2.
The urea crushing pipe 64 is located in the first inner cavity 611, and a plurality of urea crushing grooves 641 are arranged on the outer wall of the urea crushing pipe 64. The urea break tank 641 facilitates further breaking up the urea particles into smaller particles, thereby reducing the risk of urea crystallization and improving ammonia uniformity.
When in use, the tail gas of the diesel engine passes through the third aftertreatment carrier component 3 and the first aftertreatment carrier component 1 and enters the first cavity 53 through the first opening 51; then, most of the tail gas flows in from gas flow inlet 613 and is guided by swirl plate 612 to rotate into swirl tube 61; a small portion of the higher temperature exhaust flows into the cone 69 through the gas flow holes 681; the tail gas and urea liquid drops are mixed in the cyclone tube 61 and form a downward rotating airflow; the rotating airflow flows down into cone 69; in the process of downward flow, the urea liquid drops are further crushed by the action of the urea crushing pipe 64 and the urea crushing plate 65; then, a portion of the mixed gas flow continues downwards until it reaches the bottom wall 81 of the end module 8; at this time, a part of the mixed gas flow is blocked by the bottom wall 81, and turns around and flows upward; the swirling mixed air flow generates swirling flow along the first arc-shaped wall 823 and the second arc-shaped wall 824, and flows uniformly to the end face of the second aftertreatment carrier assembly 2 through the first air flow penetration holes 825 and the second air flow penetration holes 851.
Compared with the prior art, the volume of the mixing cavity for mixing the tail gas and the urea liquid drops is increased by arranging the cone 69, the tail gas with higher temperature is introduced into the mixing cavity through the airflow through hole 681 on the baffle 68, and the anti-crystallization capacity is improved.
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 specification should be based on the technical personnel in the field, and although the present specification has described the invention in detail with reference 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 the 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 (9)

1. A mixing cavity assembly comprises a mixing cavity shell and a mixing tube assembly arranged in the mixing cavity shell, wherein the mixing cavity shell is provided with a first opening communicated with a first post-processing carrier assembly, a second opening communicated with a second post-processing carrier assembly, a first cavity communicated with the first opening and a second cavity communicated with the second opening; the method is characterized in that: the mixing pipe assembly comprises a cyclone pipe positioned in the first cavity, a baffle plate positioned in the first cavity and connected with the cyclone pipe, and a cone positioned in the first cavity and used for accommodating the baffle plate; the cyclone tube is provided with a first inner cavity, a plurality of cyclone plates and an airflow inlet corresponding to the cyclone plates, and the first inner cavity is communicated with the first cavity through the airflow inlet; the baffle is provided with a plurality of airflow through holes, the cone is provided with a first port and a second port, the first port is used for installing the baffle, the second port is communicated with the second cavity, and the area of the first port is larger than that of the second port.
2. The mixing chamber assembly of claim 1, wherein: the mixing chamber shell is provided with a mounting seat for mounting a urea nozzle, and the urea nozzle is used for spraying atomized urea liquid drops into the cyclone tube.
3. The mixing chamber assembly of claim 1, wherein: the mixing cavity shell is provided with a partition plate positioned between the first cavity and the second cavity.
4. The mixing chamber assembly of claim 3, wherein: the mixing tube assembly includes a connecting tube connected to the second port, the connecting tube extending into the second cavity.
5. The mixing chamber assembly of claim 4, wherein: the pipe wall of the connecting pipe is provided with a plurality of air flow perforations.
6. The mixing chamber assembly of claim 4, wherein: the mixing cavity assembly comprises an end assembly which is positioned in the second cavity and positioned at the bottom of the connecting pipe, and the end assembly comprises a bottom wall, a peripheral wall and a buffer cavity, wherein the peripheral wall extends upwards from the periphery of the bottom wall, and the buffer cavity is enclosed by the bottom wall and the peripheral wall.
7. The mixing chamber assembly of claim 6, wherein: the peripheral wall is provided with a first side wall facing the second aftertreatment carrier assembly, and the first side wall is provided with a plurality of first airflow perforations through which airflow flows.
8. The mixing chamber assembly of claim 1, wherein: the mixing tube assembly includes a urea break tube located in the first inner cavity.
9. An exhaust aftertreatment package comprising a first aftertreatment carrier component, a second aftertreatment carrier component, a third aftertreatment carrier component located upstream of the first aftertreatment carrier component, and a mixing chamber component connecting the first aftertreatment carrier component with the second aftertreatment carrier component, wherein the first aftertreatment carrier component is a diesel particulate trap, the second aftertreatment carrier component is a selective catalytic reduction agent, the third aftertreatment carrier component is a diesel oxidation catalyst, characterized in that: the mixing chamber assembly of any one of claims 1 to 8.
CN202011288635.8A 2020-11-17 2020-11-17 Mixing chamber subassembly and tail gas aftertreatment encapsulation Pending CN112412589A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011288635.8A CN112412589A (en) 2020-11-17 2020-11-17 Mixing chamber subassembly and tail gas aftertreatment encapsulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011288635.8A CN112412589A (en) 2020-11-17 2020-11-17 Mixing chamber subassembly and tail gas aftertreatment encapsulation

Publications (1)

Publication Number Publication Date
CN112412589A true CN112412589A (en) 2021-02-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011288635.8A Pending CN112412589A (en) 2020-11-17 2020-11-17 Mixing chamber subassembly and tail gas aftertreatment encapsulation

Country Status (1)

Country Link
CN (1) CN112412589A (en)

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