CN112324550A - Tail gas aftertreatment encapsulation - Google Patents

Tail gas aftertreatment encapsulation Download PDF

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Publication number
CN112324550A
CN112324550A CN202011349292.1A CN202011349292A CN112324550A CN 112324550 A CN112324550 A CN 112324550A CN 202011349292 A CN202011349292 A CN 202011349292A CN 112324550 A CN112324550 A CN 112324550A
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CN
China
Prior art keywords
aftertreatment
carrier assembly
mixing
mixing cavity
axial direction
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
CN202011349292.1A
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Chinese (zh)
Inventor
严才宝
吴涛涛
王伟
沈义
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 CN202011349292.1A priority Critical patent/CN112324550A/en
Publication of CN112324550A publication Critical patent/CN112324550A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F01N13/0097—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 the purifying devices are arranged in a single housing
    • 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
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing

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  • 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

An exhaust aftertreatment package comprises a first aftertreatment carrier component, a second aftertreatment carrier component, a first mixing cavity shell, a mixing tube, a second mixing cavity shell and a third aftertreatment carrier component. The first mixing cavity shell is provided with a first mixing cavity. The mixing pipe is cylindrical, and is provided with a plurality of swirl fins at least partially positioned in the first mixing cavity. The extension direction of the swirl fins and the respective roots of the swirl fins form a certain inclination angle along the circumferential tangential direction of the mixing tube, wherein the inclination angle of the swirl fins close to the outlet position of the second aftertreatment carrier assembly is smaller than the inclination angle of the swirl fins far away from the outlet position of the second aftertreatment carrier assembly. So set up, through the velocity of flow with tail gas and the inclination phase-match of whirl fin, the air current homogeneity when having improved tail gas entering hybrid tube.

Description

Tail gas aftertreatment encapsulation
Technical Field
The invention relates to a tail gas aftertreatment package, and belongs to the technical field of engine tail gas aftertreatment.
Background
With the increasing upgrading of emission regulations, existing exhaust aftertreatment packages typically include a diesel oxidation catalyst, a diesel particulate trap, a selective catalytic reductant, and a mixing tube assembly installed between the diesel particulate trap and the selective catalytic reductant. The mixing tube assembly typically includes a plurality of swirl fins to introduce the exhaust gas helically into the mixing tube assembly.
However, the inclination angles of the existing swirl fins are approximately the same, which causes that the swirl fin close to the outlet of the upstream catalyst carrier can allow more exhaust gas to flow in, while the swirl fin far away from the outlet of the upstream catalyst carrier can only allow a small part of exhaust gas to flow in, which causes uneven distribution of the exhaust gas when entering the mixing pipe assembly, thereby reducing the mixing uniformity of the exhaust gas and urea liquid drops, and causing easy generation of urea crystals.
Disclosure of Invention
The invention aims to provide a tail gas post-treatment package capable of improving the uniformity of airflow when tail gas enters a mixing pipe.
In order to achieve the purpose, the invention adopts the following technical scheme: a tail gas aftertreatment package comprises a first aftertreatment carrier assembly, a second aftertreatment carrier assembly communicated with the first aftertreatment carrier assembly and located at the downstream of the first aftertreatment carrier assembly, a first mixing cavity shell communicated with the second aftertreatment carrier assembly and located at the downstream of the second aftertreatment carrier assembly, a mixing pipe communicated with the first mixing cavity shell, a second mixing cavity shell communicated with the mixing pipe, and a third aftertreatment carrier assembly communicated with the second mixing cavity shell, wherein the first mixing cavity shell is provided with a first mixing cavity, the mixing pipe is cylindrical, the mixing pipe is provided with a plurality of swirl fins at least partially located in the first mixing cavity, the extension directions of the swirl fins and the respective roots of the swirl fins form a certain inclination angle along the circumferential tangential direction of the mixing pipe, wherein an angle of inclination of the swirl fins at a location proximate the outlet of the second aftertreatment carrier assembly is less than an angle of inclination of the swirl fins at a location distal the outlet of the second aftertreatment carrier assembly.
As a further improvement of the present invention, the first aftertreatment support element comprises a diesel oxidation catalyst.
As a further improved technical scheme of the invention, the tail gas aftertreatment package also comprises an air inlet taper pipe communicated with the diesel oxidation catalyst.
As a further development of the invention, the second aftertreatment carrier assembly comprises a diesel particulate trap, the second aftertreatment carrier assembly being detachably connected to the first aftertreatment carrier assembly.
As a further improved technical solution of the present invention, the first mixing chamber housing is provided with a urea nozzle mounting seat, the urea nozzle mounting seat is used for mounting a urea nozzle, and the urea nozzle is used for spraying atomized urea liquid droplets into the first mixing chamber.
As a further improved technical solution of the present invention, the second mixing chamber housing is provided with a second mixing chamber, a first connection port communicated with the second mixing chamber, and a second connection port communicated with the second mixing chamber, wherein the first connection port is connected with the third aftertreatment carrier component, and the exhaust aftertreatment package further includes a fourth aftertreatment carrier component connected with the second connection port.
As a further improved technical solution of the present invention, the third aftertreatment carrier assembly is connected in parallel with the fourth aftertreatment carrier assembly.
As a further improvement of the present invention, the first aftertreatment carrier assembly extends in a first axial direction, the second aftertreatment carrier assembly extends in a second axial direction, the third aftertreatment carrier assembly extends in a third axial direction, and the fourth aftertreatment carrier assembly extends in a fourth axial direction, wherein the first axial direction and the second axial direction are aligned, and the second axial direction, the third axial direction, and the fourth axial direction are parallel to each other.
As a further improvement of the present invention, the third aftertreatment support element includes a selective catalytic reduction agent.
As a further improvement of the present invention, the fourth aftertreatment support element includes a selective catalytic reduction agent.
Compared with the prior art, because the tail gas flow velocity at the position close to the outlet of the second aftertreatment carrier assembly is higher, and the tail gas flow velocity at the position far away from the outlet of the second aftertreatment carrier assembly is lower, the inclination angle of the swirl fin at the position close to the outlet of the second aftertreatment carrier assembly is smaller than the inclination angle of the swirl fin at the position far away from the outlet of the second aftertreatment carrier assembly; so set up, through the velocity of flow with tail gas and the inclination phase-match of whirl fin, the air current homogeneity when having improved tail gas entering hybrid tube.
Drawings
FIG. 1 is a schematic perspective view of an exhaust aftertreatment package according to the invention in one embodiment.
Fig. 2 is a front view of fig. 1.
Fig. 3 is a schematic sectional view taken along line B-B in fig. 2.
Fig. 4 is a partially exploded perspective view of fig. 1.
Fig. 5 is a partially enlarged view of circled portion C in fig. 4.
Fig. 6 is a partially enlarged view of a circled portion D in fig. 3.
Detailed Description
The following detailed description of the embodiments of the invention will be described in conjunction with the accompanying drawings, in which, if there are several embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the accompanying drawings, like numbers or symbols in different drawings represent the same or similar elements unless otherwise specified. The statements made in the following exemplary embodiments do not represent all embodiments of the present invention, but rather they are merely examples of products consistent with the present invention as recited in the claims of the present invention.
The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention. It should be understood that the use of terms such as "first," "second," and the like, in the description and in the claims of the present invention do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another.
Referring to fig. 1 to 6, the present invention discloses an exhaust gas aftertreatment package 100, which includes a housing 7, a first baffle 21 and a second baffle 22 connected to the housing 7 and spaced apart from each other, an intake cone 1 for the exhaust gas to enter, a first aftertreatment carrier assembly 31 communicated with the intake cone 1 and located downstream of the intake cone 1, a second aftertreatment carrier assembly 32 communicated with the first aftertreatment carrier assembly 31 and located downstream of the first aftertreatment carrier assembly 31, a first mixing chamber housing 41 communicated with the second aftertreatment carrier assembly 32 and located downstream of the second aftertreatment carrier assembly 32, a mixing pipe 5 communicated with the first mixing chamber housing 41, a second mixing chamber housing 42 communicated with the mixing pipe 5, a third aftertreatment carrier assembly 33 communicated with the second mixing chamber housing 42, and a fourth aftertreatment carrier communicated with the second mixing chamber housing 42 And (6) an assembly 34.
Specifically, in one embodiment of the present invention, the first aftertreatment carrier assembly 31 includes a Diesel Oxidation Catalyst (DOC), the second aftertreatment carrier assembly 32 includes a diesel particulate trap (DPF), the third aftertreatment carrier assembly 33 includes a selective catalytic reduction agent (SCR), and the fourth aftertreatment carrier assembly 34 includes a selective catalytic reduction agent (SCR). The third aftertreatment carrier assembly 33 is connected in parallel with the fourth aftertreatment carrier assembly 34. The second aftertreatment carrier assembly 32 is detachably connected to the first aftertreatment carrier assembly 31. For example, the second aftertreatment carrier assembly 32 may be removably attached to the first aftertreatment carrier assembly 31 by clips. So configured, cleaning and maintenance of the second aftertreatment carrier assembly 32 is facilitated.
The first mixing chamber housing 41 is provided with a first mixing chamber 410, the exhaust gas aftertreatment package 100 is provided with a urea nozzle mounting seat 411, the urea nozzle mounting seat 411 is used for mounting a urea nozzle 8 (as shown in fig. 2), and the urea nozzle 8 is used for spraying atomized urea liquid drops into the mixing pipe 5.
The second mixing chamber housing 42 is provided with a second mixing chamber 420, a first connection port 421 communicated with the second mixing chamber 420, and a second connection port 422 communicated with the second mixing chamber 420, wherein the first connection port 421 is connected with the third post-processing carrier component 33, and the second connection port 422 is connected with the fourth post-processing carrier component 34.
The first aftertreatment carrier assembly 31 extends in a first axial direction a1, the second aftertreatment carrier assembly 32 extends in a second axial direction a2, the third aftertreatment carrier assembly 33 extends in a third axial direction A3, and the fourth aftertreatment carrier assembly 34 extends in a fourth axial direction a4, wherein the first axial direction a1 and the second axial direction a2 are aligned, and the second axial direction a2, the third axial direction A3, and the fourth axial direction a4 are parallel to one another.
The mixing tube 5 is cylindrical, the mixing tube 5 is provided with a plurality of swirl fins 51 at least partially positioned in the first mixing chamber 410, the extending direction T1 of the swirl fins 51 and the root 511 of each swirl fin 51 form a certain inclination angle α along the circumferential tangential direction T2 of the mixing tube 5, wherein the inclination angle α of the swirl fins 51 at the outlet position M close to the second aftertreatment carrier assembly 32 is smaller than the inclination angle α of the swirl fins 51 at the outlet position M far away from the second aftertreatment carrier assembly 32.
Because the exhaust gas flow rate is greater near the exit position M of the second aftertreatment carrier assembly 32 and is less far from the exit position M of the second aftertreatment carrier assembly 32, the present invention makes the inclination angle α of the swirl fins 51 near the exit position M of the second aftertreatment carrier assembly 32 smaller than the inclination angle α of the swirl fins 51 far from the exit position M of the second aftertreatment carrier assembly 32; so set up, through the velocity of flow with tail gas and swirl fin 51's inclination alpha phase-match, the air current homogeneity when having improved tail gas entering mixing tube 5 prevents that the air current from directly blowing the urea spray beam partially, has reduced urea crystallization risk.
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 (10)

1. An exhaust aftertreatment package, its characterized in that: the device comprises a first post-processing carrier assembly, a second post-processing carrier assembly communicated with the first post-processing carrier assembly and positioned at the downstream of the first post-processing carrier assembly, a first mixing cavity shell communicated with the second post-processing carrier assembly and positioned at the downstream of the second post-processing carrier assembly, a mixing pipe communicated with the first mixing cavity shell, a second mixing cavity shell communicated with the mixing pipe, and a third post-processing carrier assembly communicated with the second mixing cavity shell, wherein the first mixing cavity shell is provided with a first mixing cavity, the mixing pipe is cylindrical, the mixing pipe is provided with a plurality of swirl fins at least partially positioned in the first mixing cavity, the extension directions of the swirl fins and the respective roots of the swirl fins form a certain inclination angle along the circumferential direction of the mixing pipe, wherein an angle of inclination of the swirl fins at a location proximate the outlet of the second aftertreatment carrier assembly is less than an angle of inclination of the swirl fins at a location distal the outlet of the second aftertreatment carrier assembly.
2. The exhaust aftertreatment package of claim 1, wherein: the first aftertreatment support assembly includes a diesel oxidation catalyst.
3. The exhaust aftertreatment package of claim 2, wherein: the tail gas aftertreatment package also comprises an air inlet taper pipe communicated with the diesel oxidation catalyst.
4. The exhaust aftertreatment package of claim 2, wherein: the second aftertreatment carrier assembly includes a diesel particulate trap, the second aftertreatment carrier assembly being detachably connected to the first aftertreatment carrier assembly.
5. The exhaust aftertreatment package of claim 1, wherein: the tail gas aftertreatment encapsulation is equipped with the urea nozzle mount pad, the urea nozzle mount pad is used for installing the urea nozzle, the urea nozzle be used for to spray atomizing urea liquid drop in the first mixing chamber.
6. The exhaust aftertreatment package of claim 1, wherein: the second mixing cavity shell is provided with a second mixing cavity, a first connecting port communicated with the second mixing cavity and a second connecting port communicated with the second mixing cavity, wherein the first connecting port is connected with the third post-processing carrier component, and the tail gas post-processing package further comprises a fourth post-processing carrier component connected with the second connecting port.
7. The exhaust aftertreatment package of claim 6, wherein: the third aftertreatment carrier assembly is connected in parallel with the fourth aftertreatment carrier assembly.
8. The exhaust aftertreatment package of claim 7, wherein: the first aftertreatment carrier assembly extends in a first axial direction, the second aftertreatment carrier assembly extends in a second axial direction, the third aftertreatment carrier assembly extends in a third axial direction, and the fourth aftertreatment carrier assembly extends in a fourth axial direction, wherein the first axial direction and the second axial direction are aligned, and the second axial direction, the third axial direction, and the fourth axial direction are parallel to each other.
9. The exhaust aftertreatment package of claim 1, wherein: the third aftertreatment support assembly includes a selective catalytic reduction agent.
10. The exhaust aftertreatment package of claim 6, wherein: the fourth aftertreatment support assembly includes a selective catalytic reduction agent.
CN202011349292.1A 2020-11-26 2020-11-26 Tail gas aftertreatment encapsulation Pending CN112324550A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011349292.1A CN112324550A (en) 2020-11-26 2020-11-26 Tail gas aftertreatment encapsulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011349292.1A CN112324550A (en) 2020-11-26 2020-11-26 Tail gas aftertreatment encapsulation

Publications (1)

Publication Number Publication Date
CN112324550A true CN112324550A (en) 2021-02-05

Family

ID=74309124

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011349292.1A Pending CN112324550A (en) 2020-11-26 2020-11-26 Tail gas aftertreatment encapsulation

Country Status (1)

Country Link
CN (1) CN112324550A (en)

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