WO2021189795A1

WO2021189795A1 - Diesel engine tail gas after treatment apparatus

Info

Publication number: WO2021189795A1
Application number: PCT/CN2020/118229
Authority: WO
Inventors: 吴光海; 吴涛涛; 许俊; 张建
Original assignee: 天纳克（苏州）排放系统有限公司
Priority date: 2020-03-24
Filing date: 2020-09-28
Publication date: 2021-09-30
Also published as: CN111188675A

Abstract

A diesel engine tail gas after treatment apparatus (100), which comprises a first after treatment assembly (1), a second after treatment assembly (2), a mixing assembly (4), a third after treatment assembly (3), and a connection pipe assembly (5) that connects the mixing assembly (4) to the third after treatment assembly (3), wherein the mixing assembly (4) comprises a mixing pipe (42) and a steel wool mixing device (43) installed within the mixing pipe (42), the mixing pipe (42) being provided with a plurality of fins (421) allowing for the inflow of tail gas so as to form rotational flow.

Description

Diesel engine exhaust gas aftertreatment device

This application claims the priority of a Chinese patent application with an application date of March 24, 2020, an application number of 202010213836.5, and an invention title of "Diesel Engine Exhaust Gas Aftertreatment Device", the entire content of which is incorporated into this application by reference.

Technical field

The invention relates to a diesel engine tail gas after-treatment device, belonging to the technical field of diesel engine tail gas after-treatment.

Background technique

A diesel engine exhaust aftertreatment device usually includes a casing, a diesel catalytic oxidizer (DOC), a diesel particulate filter (DPF), and a selective catalytic reduction agent (SCR) enclosed in the casing. In order to improve the performance of a diesel engine exhaust aftertreatment device, it usually also includes a mixing device located downstream of the diesel particulate filter (DPF) and upstream of the selective catalytic reduction agent (SCR). With the continuous upgrading of emission regulations, how to better optimize the mixing device and improve the flexibility of the layout of the diesel exhaust aftertreatment device is a technical problem that needs to be solved.

Summary of the invention

The purpose of the present invention is to provide a diesel engine tail gas aftertreatment device with strong mixing ability and better layout flexibility.

In order to achieve the above objective, the present invention adopts the following technical solution: a diesel engine exhaust after-treatment device, which includes a first after-treatment component, a second after-treatment component connected downstream of the first after-treatment component, and a second after-treatment component connected to the second A mixing component downstream of the post-processing component, a third post-processing component located downstream of the mixing component, and a connecting pipe component connecting the mixing component and the third post-processing component, wherein the first post-processing component includes A first housing, a first catalyst carrier packaged in the first housing, and an intake cavity located upstream of the first catalyst carrier; the second aftertreatment assembly includes a second housing and a first catalyst carrier packaged in the The second catalyst carrier in the second housing; the third aftertreatment assembly includes a third housing, a third catalyst carrier packaged in the third housing, and located upstream of the third catalyst carrier The connecting cavity; the mixing assembly includes a fourth shell, a mixing tube located in the fourth shell and a steel wool mixer installed in the mixing tube, the mixing tube is provided with a number of tail gas The fins forming the swirling flow; the connecting pipe assembly is used to communicate the mixing pipe and the connecting cavity.

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

As a further improved technical solution of the present invention, the diesel engine exhaust gas aftertreatment device is provided with an intake pipe at least partially inserted into the intake cavity, the intake pipe is provided with a cylindrical pipe wall, and the pipe wall faces away from A number of air inlet holes are provided on one side of the first catalyst carrier.

As a further improved technical solution of the present invention, the first housing includes a cylindrical first cylinder and a first end cover fixed at one end of the first cylinder, wherein the air inlet pipe passes through the The wall of the first cylinder is inserted into the intake cavity, the axis of the intake pipe is perpendicular to the axis of the first cylinder, and the intake pipe is located between the first end cover and the first end cover. Between the catalyst supports.

As a further improved technical solution of the present invention, the fourth housing includes a cylindrical fourth cylinder and a second end cover fixed at one end of the fourth cylinder, and the axis of the mixing tube is perpendicular to the The axis of the fourth cylinder.

As a further improved technical solution of the present invention, the second housing includes a cylindrical second cylinder, and the first cylinder, the second cylinder, and the fourth cylinder are arranged in alignment.

As a further improved technical solution of the present invention, the fourth housing includes a nozzle mounting seat mounted on the fourth cylinder, the nozzle mounting seat is used to install a urea nozzle, and the urea nozzle is used to Atomized urea droplets are sprayed into the mixing tube, and the fin is located between the nozzle mounting seat and the steel wool mixer in the axial direction of the mixing tube.

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 further improved technical solution of the present invention, the third housing includes a cylindrical third cylinder, a mounting bracket connected to the bottom of the third cylinder, and a third cylinder connected to the top of the third cylinder. An end cone and a tail gas outlet communicating with the end cone, and the third cylinder is perpendicular to the first cylinder, the second cylinder and the fourth cylinder.

As a further improved technical solution of the present invention, the first catalyst carrier is a diesel catalytic oxidizer (DOC), the second catalyst carrier is a diesel particulate filter (DPF), and the third catalyst carrier is a selective catalytic reduction Agent (SCR).

Compared with the prior art, the present invention improves the crushing of urea and improves the mixing effect by arranging a steel wool mixer in the mixing pipe; in addition, the connecting pipe assembly is arranged to connect the mixing assembly and the third post-processing assembly. The installation position of the post-processing components can be adjusted according to different needs, which improves the flexibility of installation.

Description of the drawings

Fig. 1 is a three-dimensional schematic diagram of a diesel engine exhaust gas aftertreatment device of the present invention.

Fig. 2 is a schematic cross-sectional view of the first post-processing component, the second post-processing component, and the mixing component along the line A-A in Fig. 1.

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

Detailed ways

Please refer to Figures 1 to 3, the present invention discloses a diesel engine exhaust after-treatment device 100, which includes a first after-treatment component 1, a second after-treatment component connected downstream of the first after-treatment component 1 2. The mixing assembly 4 connected downstream of the second post-processing assembly 2, the third post-processing assembly 3 located downstream of the mixing assembly 4, and the connection connecting the mixing assembly 4 and the third post-processing assembly 3 Tube assembly 5.

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

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

The second post-processing component 2 is detachably connected between the first post-processing component 1 and the mixing component 4. In the illustrated embodiment of the present invention, the second post-processing component 2 is detachably connected between the first post-processing component 1 and the mixing component 4 by a clamp 20. The second post-processing assembly 2 includes a second housing 21 and a second catalyst carrier 22 encapsulated in the second housing 21. In the illustrated embodiment of the present invention, the second housing 21 includes a second cylindrical body 211 having a cylindrical shape. In one embodiment of the present invention, the second catalyst carrier 22 is a diesel particulate filter (DPF).

The third post-treatment assembly 3 includes a third housing 31, a third catalyst carrier 32 encapsulated in the third housing 31, and a connecting cavity 33 located upstream of the third catalyst carrier 32. The third housing 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 A tail gas outlet 314 communicating 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 assembly 3 can be installed on the vehicle by providing the mounting bracket 312. In one embodiment of the present invention, the third catalyst carrier 32 is a selective catalytic reduction agent (SCR).

The mixing assembly 4 includes a fourth housing 41, a mixing pipe 42 located in the fourth housing 41, and a steel wool mixer 43 installed in the mixing pipe 42. The mixing tube 42 is provided with a plurality of fins 421 for the exhaust gas to flow in to form a swirling flow; the fourth housing 41 includes a cylindrical fourth cylinder 411 and a fourth cylinder 411 fixed at one end of the fourth cylinder 411 In the second end cover 412, 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 installed on the fourth cylinder 411, the nozzle mounting seat 413 is used to install a urea nozzle 414, and the urea nozzle 414 is used to The atomized urea droplets are sprayed into the mixing pipe 42. The fin 421 is located between the nozzle mounting seat 413 and the steel wool mixer 43 in the axial direction of the mixing tube 42. By setting the steel wool mixer 43 in the mixing pipe 42, the urea crushing is improved and the 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 and arranged in a horizontal direction. The third cylinder 311 is arranged 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 to communicate with the mixing tube 42 and the connecting cavity 33. The connecting tube assembly 5 is provided with a flexible tube 51 close to the third housing 311 to absorb vibration. By designing different forms of connecting pipe assemblies 5, it is possible to realize the installation of the third post-processing assembly 3 and other post-processing assemblies at different angles and distances, which improves the flexibility of installation.

The above embodiments are only used to illustrate the present invention and not to limit the technical solutions described in the present invention. The understanding of this specification should be based on those skilled in the art, although this specification has already described the present invention in detail with reference to the above embodiments. Note, however, those of ordinary skill in the art should understand that those skilled in the art can still modify or equivalently replace the present invention, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered in Within the scope of the claims of the present invention.

Claims

A diesel engine exhaust gas after-treatment device, which is characterized by comprising a first after-treatment component, a second after-treatment component connected downstream of the first after-treatment component, a mixing component connected downstream of the second after-treatment component, A third post-processing component located downstream of the mixing component and a connecting pipe assembly connecting the mixing component and the third post-processing component, wherein the first post-processing component includes a first housing and is encapsulated in the The first catalyst carrier in the first housing and the air intake cavity located upstream of the first catalyst carrier; the second aftertreatment assembly includes a second housing and a first encapsulated in the second housing Two catalyst carriers; the third post-treatment assembly includes a third shell, a third catalyst carrier packaged in the third shell, and a connecting cavity located upstream of the third catalyst carrier; the mixing assembly It includes a fourth shell, a mixing tube located in the fourth shell, and a steel wool mixer installed in the mixing tube, the mixing tube is provided with a plurality of fins for the exhaust gas to flow in to form a swirling flow; The connecting pipe assembly is used for connecting the mixing pipe and the connecting cavity.
7. The diesel engine exhaust after-treatment device according to claim 1, wherein the second after-treatment component is detachably connected between the first after-treatment component and the mixing component.
The diesel engine exhaust gas after-treatment device according to claim 1, wherein the diesel engine exhaust gas after-treatment device is provided with an intake pipe at least partially inserted into the intake cavity, and the intake pipe is provided with a cylindrical tube The side of the tube wall facing away from the first catalyst carrier is provided with a plurality of air inlet holes.
The diesel engine exhaust after-treatment device according to claim 3, wherein the first housing comprises a cylindrical first cylinder and a first end cover fixed at one end of the first cylinder, wherein The intake pipe penetrates the wall of the first cylinder to be inserted into the intake cavity, the axis of the intake pipe is perpendicular to the axis of the first cylinder, and the intake pipe is located in the first cylinder. Between one end cover and the first catalyst carrier.
The diesel engine exhaust after-treatment device according to claim 4, wherein the fourth housing includes a cylindrical fourth cylinder and a second end cover fixed to one end of the fourth cylinder, so The axis of the mixing tube is perpendicular to the axis of the fourth cylinder.
The diesel engine exhaust after-treatment device according to claim 5, wherein the second housing includes a cylindrical second cylinder, the first cylinder, the second cylinder, and the first cylinder The four cylinders are arranged in alignment.
The diesel engine exhaust after-treatment device according to claim 1, wherein the fourth housing includes a nozzle mounting seat installed on the fourth cylinder, and the nozzle mounting seat is used to install a urea nozzle, so The urea nozzle is used for spraying atomized urea droplets into the mixing tube, and the fin is located between the nozzle mounting seat and the steel wool mixer in the axial direction of the mixing tube.
The diesel engine exhaust after-treatment device according to claim 1, wherein the connecting pipe assembly is provided with a flexible pipe close to the third housing.
The diesel engine exhaust after-treatment device according to claim 1, wherein the third housing includes a cylindrical third cylinder, a mounting bracket connected to the bottom of the third cylinder, and An end cone at the top of the third cylinder and a tail gas outlet communicating with the end cone, the third cylinder is perpendicular to the first cylinder, the second cylinder, and the fourth cylinder.
The diesel engine exhaust after-treatment device according to claim 1, wherein the first catalyst carrier is a diesel catalytic oxidizer (DOC), the second catalyst carrier is a diesel particulate filter (DPF), and the first catalyst carrier is a diesel particulate filter (DPF). The three-catalyst carrier is a selective catalytic reduction agent (SCR).