CN213654966U

CN213654966U - Tail gas aftertreatment encapsulation

Info

Publication number: CN213654966U
Application number: CN202022780576.8U
Authority: CN
Inventors: 严才宝; 吴涛涛; 王伟; 沈义
Original assignee: Tenneco Suzhou Emission System Co Ltd
Current assignee: Tenneco Suzhou Emission System Co Ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-07-09
Anticipated expiration: 2030-11-26

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, a third aftertreatment carrier component and a fourth aftertreatment carrier component. The second mixing chamber housing includes an end plate, a baffle plate, and a second mixing chamber. The end plate is provided with a first connecting port, a second connecting port and a third connecting port. The guide plate is provided with a first arc-shaped surface sunken towards the direction far away from the first connecting port, a second arc-shaped surface sunken towards the direction far away from the second connecting port and a third arc-shaped surface protruding towards the direction of the third connecting port, and the third arc-shaped surface is connected with the first arc-shaped surface and the second arc-shaped surface. So set up, reduced the backpressure, improved the homogeneity of air current when getting into third aftertreatment carrier subassembly and fourth aftertreatment carrier subassembly.

Description

Tail gas aftertreatment encapsulation

Technical Field

The utility model relates to a tail gas aftertreatment encapsulation belongs to engine exhaust aftertreatment technical field.

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.

However, it is a technical problem for a person skilled in the art how to improve the uniformity of the flow of the mixture of exhaust gas and urea droplets when passing through the inlet end face of the selective catalytic reduction agent, and how to reduce the back pressure.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can improve the tail gas aftertreatment encapsulation of air current distribution homogeneity and reduction backpressure.

In order to achieve the above purpose, the utility model adopts the following technical scheme: an exhaust gas aftertreatment package comprises a first aftertreatment carrier assembly, a second aftertreatment carrier assembly communicated with the first aftertreatment carrier assembly and positioned at the downstream of the first aftertreatment carrier assembly, a first mixing cavity shell communicated with the second aftertreatment carrier assembly and positioned 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, a third aftertreatment carrier assembly communicated with the second mixing cavity shell and a fourth aftertreatment carrier assembly communicated with the second mixing cavity shell, wherein the first mixing cavity shell is provided with a first mixing cavity, the second mixing cavity shell comprises an end plate, a guide plate connected with the end plate and a second mixing cavity positioned between the end plate and the guide plate, the end plate be equipped with the first connector that third aftertreatment carrier module links to each other, with the second connector that fourth aftertreatment carrier module links to each other and with the third connector that the hybrid tube links to each other, the guide plate is equipped with to keeping away from sunken first arcwall face of direction of first connector, to keeping away from sunken second arcwall face of direction of second connector and to the convex third arcwall face of direction of third connector, the third arcwall face is connected first arcwall face with the second arcwall face.

As a further improved aspect of the present invention, the first aftertreatment support assembly includes a diesel oxidation catalyst.

As a further improved technical scheme of the utility model, the tail gas aftertreatment encapsulation still include with the air inlet taper pipe that the diesel oxidation catalyst is linked together.

As a further improved technical solution of the present invention, the second post-treatment carrier assembly includes a diesel particulate trap, and the second post-treatment carrier assembly is detachably connected to the first post-treatment carrier assembly.

As the utility model discloses further modified technical scheme, the encapsulation of tail gas aftertreatment is equipped with urea nozzle mount pad, 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 hybrid tube.

As a further improved technical solution of the present invention, the third post-processing carrier assembly is connected in parallel with the fourth post-processing carrier assembly.

As a further improved technical solution of the present invention, the first post-processing carrier assembly extends along the first axial direction, the second post-processing carrier assembly extends along the second axial direction, the third post-processing carrier assembly extends along the third axial direction, the fourth post-processing carrier assembly extends along the fourth axial direction, wherein the first axial direction and the second axial direction are aligned, 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 assembly includes a selective catalytic reduction agent.

As a further improved aspect of the present invention, the fourth aftertreatment support assembly includes a selective catalytic reduction agent.

As a further improved technical scheme of the utility model, the encapsulation of tail gas aftertreatment is including being located the broken pipe of urea in the hybrid tube, be equipped with the edge on the pipe wall of the broken pipe of urea a plurality of slots of the axial extension of the broken pipe of urea.

Compared with the prior art, the utility model has the advantages that the third arc-shaped surface is arranged, so that the airflow flowing out of the mixing pipe can be guided to two sides, and the back pressure is reduced; in addition, through setting up first arcwall face and second arcwall face, can increase the buffering to the air current to the homogeneity of air current when getting into third aftertreatment carrier subassembly and fourth aftertreatment carrier subassembly has been improved.

Drawings

Fig. 1 is a schematic perspective view of the exhaust aftertreatment package according to an embodiment of the present invention.

Fig. 2 is a partially exploded perspective view of fig. 1.

Fig. 3 is a further partially exploded perspective view of fig. 2.

FIG. 4 is a perspective view of the second mixing chamber housing of FIG. 3.

Fig. 5 is a top view of fig. 4.

Fig. 6 is a schematic sectional view taken along line B-B in fig. 5.

Detailed Description

The present invention will be described in detail with reference to the drawings, wherein 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 matters described 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 invention. It should be understood that the terms "first," "second," and the like as used in the description and in the claims of the present invention do not denote any order, quantity, or importance, but rather 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 arranged at an interval, an inlet cone 1 for the exhaust gas to enter, a first aftertreatment carrier assembly 31 communicated with the inlet cone 1 and located at a downstream of the inlet cone 1, a second aftertreatment carrier assembly 32 communicated with the first aftertreatment carrier assembly 31 and located at a downstream of the first aftertreatment carrier assembly 31, a first mixing chamber housing 41 communicated with the second aftertreatment carrier assembly 32 and located at a 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 housing 42 communicated with the second mixing chamber housing 42 A carrier 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 (not shown), and the exhaust gas aftertreatment package 100 is provided with a urea nozzle mount (not shown) for mounting a urea nozzle (not shown) for spraying atomized urea droplets into the mixing pipe 5.

The second mixing chamber housing 42 includes an end plate 421, a baffle 422 connected to the end plate 421, and a second mixing chamber 420 between the end plate 421 and the baffle 422. The end plate 421 is provided with a first connection port 4211 connected to the third aftertreatment carrier module 33, a second connection port 4212 connected to the fourth aftertreatment carrier module 34, and a third connection port 4213 connected to the mixing pipe 5. The guide plate 422 is provided with a first arc-shaped surface 4221 recessed in a direction away from the first connection port 4211, a second arc-shaped surface 4222 recessed in a direction away from the second connection port 4212, and a third arc-shaped surface 4223 protruding in a direction toward the third connection port 4213, and the third arc-shaped surface 4223 is connected with the first arc-shaped surface 4221 and the second arc-shaped surface 4222.

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 pipe 5 is cylindrical. The exhaust gas aftertreatment package 100 further comprises a urea crushing pipe 51 located in the mixing pipe 5, and a plurality of slots 511 extending along the axial direction of the urea crushing pipe 5 are arranged on the pipe wall of the urea crushing pipe 51. By providing said slots 511, it is facilitated to further break up the urea particles into smaller particles, thereby reducing the risk of urea crystallization and improving ammonia homogeneity. In addition, when the urea droplets form a liquid film in the part of the slot 511, the liquid film can also move along the extending direction of the slot 511 by the blowing of the air flow, and the risk of urea crystallization due to the liquid film staying in a certain part for a long time is reduced.

The utility model can guide the air flow flowing out of the mixing pipe 5 to two sides by arranging the third arc-shaped surface 4223, thereby reducing the back pressure; in addition, by providing the first and second

curved surfaces

4221 and 4222, the buffering of the air flow can be increased, thereby improving the uniformity of the air flow when entering the third and fourth

aftertreatment carrier assemblies

33 and 34.

The above embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, and the understanding of the present specification should be based on the technical personnel in the technical field, and although the present specification has described the present invention in detail with reference to the above embodiments, the skilled personnel in the art should understand that the technical personnel in the technical field can still modify or substitute the present invention, and all the technical solutions and modifications thereof that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

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, a third post-processing carrier assembly communicated with the second mixing cavity shell and a fourth 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 second mixing cavity shell comprises an end plate, a guide plate connected with the end plate and a second mixing cavity positioned between the end plate and the guide plate, the end plate is provided with a first connecting port connected with the third post-processing carrier assembly, The guide plate is provided with a first arc-shaped surface which is sunken towards the direction far away from the first connecting port, a second arc-shaped surface which is sunken towards the direction far away from the second connecting port and a third arc-shaped surface which is convex towards the direction of the third connecting port, and the third arc-shaped surface is connected with the first arc-shaped surface and the second arc-shaped surface.

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 hybrid tube.

6. The exhaust aftertreatment package of claim 1, wherein: the third aftertreatment carrier assembly is connected in parallel with the fourth aftertreatment carrier assembly.

7. The exhaust aftertreatment package of claim 6, 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.

8. The exhaust aftertreatment package of claim 1, wherein: the third aftertreatment support assembly includes a selective catalytic reduction agent.

9. The exhaust aftertreatment package of claim 1, wherein: the fourth aftertreatment support assembly includes a selective catalytic reduction agent.

10. The exhaust aftertreatment package of any one of claims 1 to 9, wherein: the tail gas aftertreatment encapsulation includes being located the broken pipe of urea in the hybrid tube, be equipped with on the pipe wall of the broken pipe of urea along the axial extension's of the broken pipe of urea a plurality of slots.