CN212154909U

CN212154909U - Diesel engine tail gas after-treatment device

Info

Publication number: CN212154909U
Application number: CN202020390566.0U
Authority: CN
Inventors: 吴光海; 吴涛涛; 许俊; 张建
Original assignee: Tenneco Suzhou Emission System Co Ltd
Current assignee: Tenneco Suzhou Emission System Co Ltd
Priority date: 2020-03-24
Filing date: 2020-03-24
Publication date: 2020-12-15
Anticipated expiration: 2030-03-24

Abstract

The utility model provides a diesel engine tail gas aftertreatment device, its includes first aftertreatment subassembly, second aftertreatment subassembly, mixing assembly, third aftertreatment subassembly and connects the mixing assembly with the connecting tube subassembly of third aftertreatment subassembly, wherein mixing assembly includes the hybrid tube and installs the steel wool blender in the hybrid tube, the hybrid tube is equipped with a plurality of fins that supply tail gas to flow in order to form the whirl. Compared with the prior art, the utility model improves the urea crushing and the mixing effect by arranging the steel wool mixer in the mixing pipe; in addition, the mixing assembly and the third post-processing assembly are connected by the connecting pipe assembly, the mounting position of the third post-processing assembly can be adjusted according to different requirements, and the mounting flexibility is improved.

Description

Diesel engine tail gas after-treatment device

Technical Field

The utility model relates to a diesel engine tail gas aftertreatment device belongs to diesel engine tail gas aftertreatment technical field.

Background

Diesel exhaust aftertreatment devices typically include a housing and, enclosed therein, a diesel catalytic oxidizer (DOC), a diesel particulate trap (DPF), and a Selective Catalytic Reductant (SCR). In order to improve the performance of diesel exhaust after-treatment devices, they also typically include a mixing device downstream of the diesel particulate trap (DPF) and upstream of the Selective Catalytic Reduction (SCR). With the continuous upgrading of emission regulations, how to better optimize a mixing device and improve the flexibility of the arrangement of a diesel engine exhaust after-treatment device is a technical problem to be solved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a stronger and better diesel engine tail gas aftertreatment device of flexibility of arrangement of mixing ability.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a diesel exhaust aftertreatment device comprising a first aftertreatment component, a second aftertreatment component connected downstream of the first aftertreatment component, a mixing component connected downstream of the second aftertreatment component, a third aftertreatment component located downstream of the mixing component, and a junction block assembly connecting the mixing component and the third aftertreatment component, wherein the first aftertreatment component comprises a first housing, a first catalyst carrier encapsulated in the first housing, and an air intake cavity located upstream of the first catalyst carrier; the second aftertreatment assembly includes a second housing and a second catalyst carrier encapsulated in the second housing; the third aftertreatment component comprises a third housing, a third catalyst carrier encapsulated in the third housing, and a connection cavity located upstream of the third catalyst carrier; the mixing assembly comprises a fourth shell, a mixing pipe positioned in the fourth shell and a steel wool mixer arranged in the mixing pipe, and the mixing pipe is provided with a plurality of fins for tail gas to flow in to form rotational flow; the connecting pipe assembly is used for communicating the mixing pipe and the connecting cavity.

As a further improved technical solution of the present invention, the second post-processing assembly is detachably connected between the first post-processing assembly and the mixing assembly.

As a further improved technical scheme of the utility model, diesel engine tail gas aftertreatment device is equipped with at least the part and inserts the intake pipe of the cavity that admits air, the intake pipe is equipped with cylindric pipe wall, the pipe wall dorsad one side of first catalyst carrier is equipped with a plurality of inlet ports.

As a further improved technical solution of the present invention, the first casing includes a first cylindrical body and is fixed to the first end cap of one end of the first cylindrical body, wherein the intake pipe passes through the wall portion of the first cylindrical body is inserted into the intake cavity, the axis of the intake pipe is perpendicular to the axis of the first cylindrical body, the intake pipe is located the first end cap and between the first catalyst carriers.

As a further improved technical scheme of the utility model, the fourth casing includes cylindric fourth barrel and fixes the second end cap of the one end of fourth barrel, the axis perpendicular to of hybrid tube the axis of fourth barrel.

As a further improved technical solution of the present invention, the second housing includes a cylindrical second cylinder, the first cylinder is aligned with the second cylinder and the fourth cylinder.

As a further improved technical scheme of the utility model, the fourth casing is including installing nozzle mount pad on the fourth barrel, the 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, the fin is in be located on the axis direction of hybrid tube the nozzle mount pad with between the steel wool blender.

As a further improved technical solution of the present invention, the connecting pipe assembly is provided with a flexible pipe close to the third housing.

As a technical scheme of the utility model for further improvement, the third casing includes cylindric third barrel, connects the installing support of the bottom of third barrel, connects the end cone at the top of third barrel and with the tail gas outlet of end cone intercommunication, the third barrel perpendicular to first barrel the second barrel and the fourth barrel.

As a further improved technical scheme of the utility model, first catalyst carrier is diesel oil catalytic oxidation agent (DOC), the second catalyst carrier is Diesel Particulate Filter (DPF), the third catalyst carrier is selective catalytic reduction agent (SCR).

Compared with the prior art, the utility model improves the urea crushing and the mixing effect by arranging the steel wool mixer in the mixing pipe; in addition, the mixing assembly and the third post-processing assembly are connected by the connecting pipe assembly, the mounting position of the third post-processing assembly can be adjusted according to different requirements, and the mounting flexibility is improved.

Drawings

Fig. 1 is a schematic perspective view of the diesel engine tail gas post-treatment device of the present invention.

FIG. 2 is a schematic cross-sectional view of the first aftertreatment assembly, the second aftertreatment assembly, and the mixing assembly taken along line A-A of FIG. 1.

Fig. 3 is an exploded perspective view of the mixing assembly.

Detailed Description

Referring to fig. 1 to 3, the present invention discloses a diesel engine exhaust gas post-treatment device 100, which includes a first post-treatment assembly 1, a second post-treatment assembly 2 connected to the downstream of the first post-treatment assembly 1, a mixing assembly 4 connected to the downstream of the second post-treatment assembly 2, a third post-treatment assembly 3 located at the downstream of the mixing assembly 4, and a connecting pipe assembly 5 connecting the mixing assembly 4 and the third post-treatment assembly 3.

The first aftertreatment assembly 1 comprises a first housing 11, a first catalyst carrier 12 enclosed in the first housing 11, and an air intake cavity 13 upstream of the first catalyst carrier 12. The first housing 11 includes a first cylindrical body 111 having a cylindrical shape and a first end cap 112 fixed to one end of the first cylindrical body 111. The first catalyst carrier 12 is enclosed in the first cylinder 111. In one embodiment of the present invention, the first catalyst support 12 is a diesel catalytic oxidizer (DOC).

The diesel engine exhaust aftertreatment device 100 is provided with an air inlet pipe 14 at least partially inserted into the air inlet cavity 13, the air inlet pipe 14 is provided with a cylindrical pipe wall 141, and one side of the pipe wall 141, which faces away from the first catalyst carrier 12, is provided with a plurality of air inlet holes 142. With such an arrangement, after the exhaust gas of the diesel engine enters the air inlet pipe 14, the exhaust gas flows out of the air inlet hole 142, passes through a longer flow path and then reaches the surface of the first catalyst carrier 12, so that the uniformity of air flow distribution is improved. The intake pipe 14 passes through the wall portion 1111 of the first cylinder 111 to be inserted into the intake chamber 13, the axis 140 of the intake pipe 14 is perpendicular to the axis 1110 of the first cylinder 111, and the intake pipe 14 is located between the first end cover 112 and the first catalyst carrier 12.

The second aftertreatment component 2 is detachably connected between the first aftertreatment component 1 and the mixing component 4. In the illustrated embodiment of the present invention, the second aftertreatment module 2 is detachably connected between the first aftertreatment module 1 and the mixing module 4 by means of a clamp 20. The second aftertreatment assembly 2 includes a second housing 21 and a second catalyst support 22 encapsulated in the second housing 21. In the illustrated embodiment of the present invention, the second housing 21 includes a cylindrical second cylinder 211. In one embodiment of the present invention, the second catalyst carrier 22 is a diesel particulate trap (DPF).

The third aftertreatment component 3 comprises a third casing 31, a third catalyst carrier 32 enclosed in the third casing 31 and a connecting cavity 33 located upstream of the third catalyst carrier 32. The third casing 31 includes a cylindrical third cylinder 311, a mounting bracket 312 connected to the bottom of the third cylinder 311, an end cone 313 connected to the top of the third cylinder 311, and an exhaust gas outlet 314 communicated with the end cone 313. The mounting bracket 312 is provided with a mounting flange 3121 and a plurality of mounting holes 3122 provided on the mounting flange 3121. The third aftertreatment component 3 can be mounted to the vehicle by providing the mounting bracket 312. In one embodiment of the present invention, the third catalyst support 32 is a Selective Catalytic Reduction (SCR).

The mixing assembly 4 includes a fourth housing 41, a mixing tube 42 located within the fourth housing 41, and a steel wool mixer 43 mounted in the mixing tube 42. The mixing pipe 42 is provided with a plurality of fins 421 for tail gas to flow in to form rotational flow; the fourth housing 41 includes a cylindrical fourth cylinder 411 and a second end cap 412 fixed to one end of the fourth cylinder 411, and the axis 420 of the mixing tube 42 is perpendicular to the axis 4110 of the fourth cylinder 411. In addition, the fourth housing 41 further includes a nozzle mounting seat 413 mounted on the fourth cylinder 411, the nozzle mounting seat 413 is used for mounting a urea nozzle 414, and the urea nozzle 414 is used for spraying atomized urea liquid drops into the mixing pipe 42. The fin 421 is located between the nozzle mount 413 and the steel wool mixer 43 in the axial direction of the mixing pipe 42. By providing the steel wool mixer 43 in the mixing tube 42, urea break-up is improved and mixing effect is improved.

In the illustrated embodiment of the present invention, the first cylinder 111, the second cylinder 211, and the fourth cylinder 411 are aligned in a horizontal direction. The third cylinder 311 is disposed in a vertical direction and perpendicular to the first cylinder 111, the second cylinder 211, and the fourth cylinder 411.

The connecting tube assembly 5 is used for communicating the mixing tube 42 and the connecting cavity 33. The connection pipe assembly 5 is provided with a flexible pipe 51 adjacent to the third housing 311 to absorb vibration. The installation of different angles and different distances between the third post-processing assembly 3 and other post-processing assemblies can be realized by designing the connecting pipe assemblies 5 in different forms, and the installation flexibility is improved.

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. A diesel engine exhaust aftertreatment device comprises a first aftertreatment component, a second aftertreatment component connected to the downstream of the first aftertreatment component, a mixing component connected to the downstream of the second aftertreatment component, a third aftertreatment component located at the downstream of the mixing component, and a connecting pipe component connecting the mixing component and the third aftertreatment component, wherein the first aftertreatment component comprises a first shell, a first catalyst carrier packaged in the first shell, and an air inlet cavity located at the upstream of the first catalyst carrier; the second aftertreatment assembly includes a second housing and a second catalyst carrier encapsulated in the second housing; the third aftertreatment component comprises a third housing, a third catalyst carrier encapsulated in the third housing, and a connection cavity located upstream of the third catalyst carrier; the mixing assembly comprises a fourth shell, a mixing pipe positioned in the fourth shell and a steel wool mixer arranged in the mixing pipe, and the mixing pipe is provided with a plurality of fins for tail gas to flow in to form rotational flow; the connecting pipe assembly is used for communicating the mixing pipe and the connecting cavity.

2. The diesel exhaust aftertreatment device of claim 1, wherein: the second aftertreatment component is removably coupled between the first aftertreatment component and the mixing component.

3. The diesel exhaust aftertreatment device of claim 1, wherein: the diesel engine tail gas aftertreatment device is provided with an air inlet pipe at least partially inserted into the air inlet cavity, the air inlet pipe is provided with a cylindrical pipe wall, and a plurality of air inlet holes are formed in one side, back to the first catalyst carrier, of the pipe wall.

4. The diesel exhaust aftertreatment device of claim 3, wherein: the first shell comprises a first cylindrical body and a first end cover fixed at one end of the first cylindrical body, wherein the air inlet pipe penetrates through the wall part of the first cylindrical body to be inserted into the air inlet cavity, the axis of the air inlet pipe is perpendicular to the axis of the first cylindrical body, and the air inlet pipe is located between the first end cover and the first catalyst carrier.

5. The diesel exhaust aftertreatment device of claim 4, wherein: the fourth shell comprises a cylindrical fourth cylinder and a second end cover fixed at one end of the fourth cylinder, and the axis of the mixing pipe is perpendicular to the axis of the fourth cylinder.

6. The diesel exhaust aftertreatment device of claim 5, wherein: the second housing includes a cylindrical second cylinder, and the first cylinder, the second cylinder, and the fourth cylinder are arranged in alignment.

7. The diesel exhaust aftertreatment device of claim 5, wherein: the fourth shell comprises a nozzle mounting seat mounted on the fourth cylinder, the nozzle mounting seat is used for mounting a urea nozzle, the urea nozzle is used for spraying atomized urea liquid drops into the mixing pipe, and the fin is located between the nozzle mounting seat and the steel wool mixer in the axial direction of the mixing pipe.

8. The diesel exhaust aftertreatment device of claim 1, wherein: the connector tube assembly is provided with a flexible tube adjacent the third housing.

9. The diesel exhaust aftertreatment device of claim 6, wherein: the third casing includes cylindric third barrel, connects the installing support of the bottom of third barrel, connects the end cone at the top of third barrel and with the tail gas export of end cone intercommunication, the third barrel perpendicular to first barrel, the second barrel and the fourth barrel.

10. The diesel exhaust aftertreatment device of claim 1, wherein: the first catalyst carrier is a diesel catalytic oxidizer (DOC), the second catalyst carrier is a diesel particulate trap (DPF), and the third catalyst carrier is a Selective Catalytic Reducer (SCR).