WO2019140893A1

WO2019140893A1 - Box-type engine exhaust post-treatment device

Info

Publication number: WO2019140893A1
Application number: PCT/CN2018/100385
Authority: WO
Inventors: 杨天佐; 王聪; 童毅君; 张建; 李军良; 顾伟; 毛伟
Original assignee: 天纳克（苏州）排放系统有限公司
Priority date: 2018-01-19
Filing date: 2018-08-14
Publication date: 2019-07-25
Also published as: CN110056418A

Abstract

A box-type engine exhaust post-treatment device (100) comprises a housing (1), multiple post-treatment assemblies, and a cavity assembly. The housing (1) comprises a first end cover (10), a first baffle (11), a second baffle (12), a second end cover (13), and a casing (14). A first space (15) is defined between the first end cover (10) and the first baffle (11). The housing (1) comprises an exhaust inlet tube (17) communicating with the first space (15). The cavity assembly comprises a mixing tube (38) and a gas flow mixing device (4). The mixing tube (38) comprises an inner cavity (381), multiple fins (382) surrounding the periphery of the inner cavity (381) and distributed circumferentially, multiple slots (383) corresponding to the multiple fins (382) and communicating with the inner cavity (381), and a perforated tube (384) arranged in the mixing tube (38). The gas flow mixing device (4) is arranged downstream relative to the perforated tube (384).

Description

Box type engine exhaust aftertreatment device

The present application claims priority to Chinese Patent Application No. 201810055379.4, filed on Jan. 19, 2018, and entitled "Box Engine Exhaust Aftertreatment Device", the entire contents of which are incorporated herein by reference. in.

Technical field

The present invention relates to a box type engine exhaust aftertreatment device.

Background technique

Box-type engine exhaust aftertreatment devices (such as diesel exhaust aftertreatment devices) are primarily devices used to treat or evolve toxic and hazardous materials in the exhaust. The poisonous substances in the exhaust gas mainly include hydrocarbons, carbon monoxide, nitrogen oxides, and particulate matter.

A combination of a diesel oxidation catalyst (DOC), a diesel particulate trap (DPF), and a selective catalytic reduction agent (SCR) has been used in the prior art to improve the efficiency of tail gas treatment. In one aspect, the oxidation type catalytic converter and the particle trap are disposed in series in the first housing, and additionally provided a first cavity in communication with the first housing; the selective catalytic reducing agent And being disposed in the second housing, and additionally providing a second cavity in communication with the second housing; and then connecting the first and second cavities in series by means of a connecting pipe. The exhaust gas is mixed with the urea droplets in the connecting conduit, and the mixture then enters the second chamber and is passed through a selective catalytic reducing agent to reduce harmful substances. However, after the mixture of the exhaust gas and the urea droplets enters the second cavity, the distribution is not uniform, and thus the mixture cannot be uniformly passed through the selective catalytic reducing agent, which reduces the processing efficiency.

Summary of the invention

It is an object of the present invention to provide a tank type engine exhaust aftertreatment device capable of achieving a more uniform mixing of exhaust gas and urea solution.

In order to achieve the above object, the present invention adopts the following technical solution: a box type engine exhaust aftertreatment device including a casing, a plurality of aftertreatment components located in the casing, and a cavity connecting the aftertreatment components a body assembly, the housing including a first end cover, a first baffle, a second baffle, a second end cap, and a periphery of the first and second baffles and the first and second ends a cover fixed to the outer casing; a first space is formed between the first end cover and the first baffle, and the casing includes an exhaust inlet pipe communicating with the first space; The post-processing assembly includes a first after-treatment component at least partially between the first and second baffles, a second post-processing component aligned with and interconnecting the first post-processing component, and the first, Two second aftertreatment assemblies arranged side by side with the second aftertreatment assembly; the first baffle being provided with a first aperture that communicates the first aftertreatment assembly with the first space; the second a second space is formed between the end cover and the second baffle. The second baffle is provided with a second opening that communicates the second aftertreatment component with the second space and a third opening that communicates with a corresponding third aftertreatment component; the cavity The assembly includes a first cavity assembly retained on the second opening, a mixing tube assembly in communication with the first cavity assembly, and a third post-treatment to dissipate the mixing tube assembly a second cavity assembly in communication with the assembly; the mixing tube assembly comprising a mixing tube and a gas flow mixing device, the mixing tube including an inner cavity, a plurality of fins distributed around the periphery of the inner cavity and circumferentially distributed And a plurality of slots corresponding to the plurality of fins and communicating with the inner cavity and a porous tube located in the mixing tube; the air flow mixing device is located downstream of the porous tube.

As a further improved technical solution of the present invention, the exhaust gas inlet pipe is abutted and fixed on the first baffle, and the exhaust gas inlet pipe is provided on the peripheral wall thereof with a plurality of rows communicating with the first space. a vent; the housing further includes an exhaust outlet tube in communication with the second space.

As a further improved technical solution of the present invention, the second baffle is provided with a through hole through which the mixing tube is suspended, and the fin extends at least partially beyond the second baffle.

As a further improved technical solution of the present invention, the mixing tube assembly includes a sleeve portion located at the second baffle and corresponding to the through hole, and the sleeve portion is provided with the expansion cavity, the fin At least partially located in the expansion chamber.

As a further improved technical solution of the present invention, the first aftertreatment component includes a diesel oxidation catalyst and a first porous distribution plate located upstream of the diesel oxidation catalyst; the second aftertreatment component includes a diesel particulate trap The third aftertreatment component includes a selective catalytic reducing agent.

As a further improved technical solution of the present invention, the box type engine exhaust aftertreatment device includes a mounting portion fixed on the second end cover and used to mount a urea nozzle, and the urea nozzle is used to The urea droplets are sprayed into the tube.

As a further improved technical solution of the present invention, the second cavity assembly includes an intermediate hole communicating with the mixing tube and two connecting holes on opposite sides of the intermediate hole, the connecting hole and the corresponding third rear The processing components are connected.

As a further improved technical solution of the present invention, the air flow mixing device includes a mixer fixed in the mixing tube, the mixer including a cylindrical portion and an interference flow sheet fixed in the cylindrical portion.

As a further improved technical solution of the present invention, the airflow mixing device includes a diffusion pipe located in the second cavity assembly and communicating with the mixing pipe, and the diffusion pipe is provided with a plurality of diffusions distributed on the circumference thereof hole.

As a further improved technical solution of the present invention, the airflow mixing device includes a bowl cover located in the second cavity assembly and aligned with the mixing tube, the bowl cover being provided with a spherical shape protruding toward the mixing tube surface.

As a further improved technical solution of the present invention, the airflow mixing device comprises an end bowl located in the second cavity assembly and aligned with the mixing tube, the end bowl being provided with a bearing space for receiving an air flow and a protrusion Into the spherical surface in the bearing space.

As a further improved technical solution of the present invention, the airflow mixing device includes a diffusion tube located in the second cavity assembly and in communication with the mixing tube, and is located in the second cavity assembly and mixed with the The tube-aligned end bowl is provided with a plurality of diffusion holes distributed on the circumference thereof; the end bowl is provided with a bearing space for receiving the air flow and a spherical surface projecting into the bearing space.

As a further improved technical solution of the present invention, the air flow mixing device includes a mixer fixed in the mixing tube, the mixer is located upstream of the diffusion tube and includes a cylindrical portion and is fixed in the cylindrical portion If the interference flows.

Compared with the prior art, the present invention double-mixes by providing a porous tube and a gas flow mixing device, thereby enhancing the crushing of urea and the heat exchange effect with the wall surface, thereby reducing the risk of urea crystallization.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing the exhaust aftertreatment device for a box type engine of the present invention.

Figure 2 is a perspective view of another angle of Figure 1.

Fig. 3 is an exploded perspective view of Fig. 1;

Figure 4 is an exploded perspective view of another angle of Figure 3.

Figure 5 is a perspective view showing the first and second end caps of Figure 2 removed.

Figure 6 is a perspective view of another angle of Figure 5.

Figure 7 is a front elevational view of Figure 1.

Figure 8 is a plan view of Figure 1.

Figure 9 is a bottom view of Figure 1.

Figure 10 is a left side view of Figure 1.

Figure 11 is a right side view of Figure 1.

Figure 12 is a perspective view showing the first end cover of Figure 6 removed.

Figure 13 is a perspective view showing the first baffle of Figure 12 removed.

Figure 14 is a perspective view showing the outer casing of Figure 13 removed.

Figure 15 is a front elevational view of Figure 2.

Figure 16 is a schematic cross-sectional view taken along line A-A of Figure 15.

Figure 17 is a cross-sectional view taken along line B-B of Figure 15.

Figure 18 is a cross-sectional view taken along line C-C of Figure 15 in the first embodiment.

Figure 19 is a perspective view of the mixer of Figure 18.

Figure 20 is a cross-sectional view taken along line C-C of Figure 15 in the second embodiment.

Figure 21 is a perspective view of the diffuser tube of Figure 20.

Figure 22 is a cross-sectional view taken along line C-C of Figure 15 in a third embodiment.

Figure 23 is a perspective view of the bowl cover of Figure 22.

Figure 24 is a perspective view of another angle of Figure 23;

Figure 25 is a cross-sectional view taken along line C-C of Figure 15 in a fourth embodiment.

Figure 26 is a perspective view of the bowl cover of Figure 25.

Figure 27 is a perspective view of another angle of Figure 26.

Detailed ways

Referring to Figures 1 to 17, the present invention discloses a box type engine exhaust aftertreatment device 100 including a housing 1, a plurality of aftertreatment components located in the housing 1, and the A cavity assembly that handles the components connected.

In the illustrated embodiment of the present invention, the housing 1 includes a first end cover 10, a first baffle 11, a second baffle 12, a second end cap 13, and the first and second stops. An outer casing 14 that is peripherally of the

plates

11, 12 and that is secured to the first and

second end caps

10, 13.

Referring to FIG. 16 and FIG. 17 , a first space 15 is formed between the first end cover 10 and the first baffle 11 , and the second end cover 13 and the second baffle 12 are A second space 16 is formed therebetween. The housing 1 includes an exhaust inlet tube 17 that enters the first space 15 through the first end cap 10 and an exhaust outlet tube 18 that communicates with the second space 16. The exhaust gas inlet pipe 17 is provided with a plurality of exhaust holes 171 communicating with the first space 15 on its peripheral wall to facilitate the distribution of the airflow. In the illustrated embodiment of the invention, the exhaust gas inlet tube 17 abuts and is fixed to the first baffle 11 for reinforcement.

The plurality of aftertreatment components include a first aftertreatment component 21 at least partially between the first and

second baffles

11, 12, a second post process aligned with and interconnected with the first post process component 21 The assembly 22 and the two third aftertreatment assemblies 23 are arranged side by side with the first and

second aftertreatment assemblies

21, 22. In the illustrated embodiment of the invention, the first aftertreatment component 21 includes a diesel oxidation catalyst 211 and a first porous distribution plate 212 located upstream of the diesel oxidation catalyst. The second aftertreatment component 22 includes a diesel particulate trap 221 . The third aftertreatment component 23 includes a selective catalytic reductant 231.

The first baffle 11 is provided with a first opening 111 for communicating the first post-processing assembly 21 with the first space 15. The second baffle 12 is provided with a second opening 121 for communicating the second post-processing component 22 with the second space 16 and a third opening communicating with the corresponding third post-processing component 23 122.

Referring to FIGS. 2 and 16, the box type engine exhaust aftertreatment device 100 further includes a mounting portion 19 fixed to the second end cover 13 for mounting a urea nozzle (not shown).

The cavity assembly includes a first cavity assembly 31 latched on the second opening 121, a mixing tube assembly 33 in communication with the first cavity assembly 31, and a mixing tube The second cavity assembly 32 of the assembly 33 is in communication with the third aftertreatment assembly 23.

The mixing tube assembly 33 includes a mixing tube 38 and a sleeve portion 39 that mates with the mixing tube 38. The mixing tube 38 includes an inner cavity 381, a plurality of fins 382 surrounding the periphery of the inner cavity 381 and distributed in the circumferential direction, corresponding to the plurality of fins 382 and communicating with the inner cavity 381 A plurality of slots 383 and a perforated tube 384 located in the mixing tube 38. The porous tube 384 at least partially overlaps the fin 382 along its axial direction. The urea nozzle is used to inject urea droplets into the porous tube 384, which enhances the crushing of the urea droplets and the heat exchange effect with the wall surface of the mixing tube 38, thereby reducing the risk of urea crystallization.

Referring to FIG. 16, the second baffle 12 is further provided with a through hole 123 through which the mixing tube 38 is suspended, and the fin 382 extends at least partially beyond the first Two baffles 12. The sleeve portion 39 corresponds to the through hole 123. The sleeve portion 39 is provided with the expansion chamber 391, and the fins 382 are at least partially located in the expansion chamber 391. The present invention increases the installation space inside the box type engine exhaust aftertreatment device 100 by providing the sleeve portion 39, and is not limited to the overall size of the box type engine exhaust aftertreatment device 100, and can be adjusted by expanding the expansion chamber. The volume of 391 is flexible to adjust the back pressure of the system to achieve a standardized design.

The second cavity assembly 32 includes an intermediate hole 321 communicating with the mixing tube 38 and two connecting holes 322 located at two sides of the intermediate hole 321 . The connecting hole 322 and the corresponding third post-processing component 23 Connected.

Referring to Figures 18 and 19, the mixing tube assembly 33 further includes a gas flow mixing device 4 located downstream of the porous tube 384. In the first embodiment, the air flow mixing device 4 includes a mixer 41 fixed in the mixing tube 38, the mixer 41 including a cylindrical portion 411 and interference if fixed in the cylindrical portion 411 Flow sheet 412.

Referring to FIG. 20 and FIG. 21, in the second embodiment, the airflow mixing device 4 includes a diffusion tube 42 located in the second cavity assembly 32 and communicating with the mixing tube 38, The diffuser tube 42 is provided with a plurality of diffusion holes 421 distributed on the circumference thereof.

Referring to Figures 22 to 24, in a third embodiment, the airflow mixing device 4 includes a bowl cover 43 located in the second cavity assembly 32 and aligned with the mixing tube 38, the bowl The cover 43 is provided with a spherical surface 431 that protrudes toward the mixing tube 38.

Referring to FIGS. 25-27, in a fourth embodiment, the airflow mixing device 4 includes an end bowl 44 located in the second cavity assembly 32 and aligned with the mixing tube 38, the end The bowl 44 is provided with a bearing space 441 for receiving an air flow and a spherical surface 442 projecting into the bearing space 441.

Of course, the above four embodiments can also be appropriately arranged and combined, for example, the first embodiment and the second embodiment are combined to improve the airflow mixing effect. In addition, for example, the second embodiment and the fourth embodiment may be combined, that is, the end bowl 44 is disposed in the diffuser tube 42 to improve the airflow mixing effect; and based on this, the first embodiment may also be used. And integration, can further improve the airflow mixing effect.

In addition, the above embodiments are only for illustrating the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of the present specification should be based on those skilled in the art, although the present specification has been carried out with reference to the above embodiments. DETAILED DESCRIPTION OF THE INVENTION However, those skilled in the art should understand that the invention may be modified or equivalently replaced by those skilled in the art without departing from the spirit and scope of the invention. It is intended to be included within the scope of the appended claims.

Claims

A box type engine exhaust aftertreatment device includes a housing, a plurality of aftertreatment assemblies located within the housing, and a cavity assembly interconnecting the aftertreatment assembly, the housing including a first end cap a first baffle, a second baffle, a second end cap, and an outer casing wrapped around the first and second baffles and fixed to the first and second end caps; the first end Forming a first space between the cover and the first baffle, the housing including an exhaust inlet tube in communication with the first space; the plurality of aftertreatment components including at least partially located at the first a first post-processing component between the second baffles, a second post-processing component aligned with and interconnecting the first post-processing component, and two thirds arranged side by side with the first and second post-processing components a post-processing assembly; the first baffle is provided with a first opening for communicating the first post-processing component with the first space; the second end cap and the second block a second space is formed between the plates, and the second baffle is provided with the second rear a second opening in communication with the second space and a third opening in communication with the corresponding third aftertreatment component; the cavity assembly including the first buttoned on the second opening a cavity assembly, a mixing tube assembly in communication with the first chamber assembly, and a second chamber assembly for communicating the mixing tube assembly with the third aftertreatment assembly; the mixing tube The assembly includes a mixing tube and an air flow mixing device, the mixing tube including an inner cavity, a plurality of fins distributed around the periphery of the inner cavity and circumferentially, corresponding to the plurality of fins and the inner cavity a plurality of slots in the body communication and a porous tube located in the mixing tube; the gas flow mixing device is located downstream of the porous tube.
A tank type engine exhaust aftertreatment device according to claim 1, wherein said exhaust inlet pipe abuts and is fixed to said first baffle, said exhaust gas inlet pipe being on a peripheral wall thereof A plurality of exhaust holes communicating with the first space are provided; the housing further includes an exhaust outlet tube in communication with the second space.
The box type engine exhaust aftertreatment device according to claim 1, wherein the second baffle is provided with a through hole through which the mixing tube is suspended, the fin The sheet extends at least partially beyond the second baffle.
A tank type engine exhaust aftertreatment device according to claim 3, wherein said mixing tube assembly includes a sleeve portion at said second baffle and corresponding to said through hole, said sleeve The expansion chamber is provided, and the fin is at least partially located in the expansion chamber.
A tank type engine exhaust aftertreatment device according to claim 1, wherein said first aftertreatment assembly comprises a diesel oxidation catalyst and a first porous distribution plate upstream of said diesel oxidation catalyst; The second aftertreatment component includes a diesel particulate trap; the third aftertreatment component includes a selective catalytic reducing agent.
A tank type engine exhaust aftertreatment device according to claim 1, wherein said box type engine exhaust aftertreatment device includes an attachment fixed to said second end cover for mounting a urea nozzle The urea nozzle is configured to inject urea droplets into the porous tube.
A tank type engine exhaust aftertreatment device according to claim 1, wherein said second cavity assembly includes an intermediate hole communicating with said mixing pipe and two connections on opposite sides of said intermediate hole a hole that communicates with a corresponding third aftertreatment component.
A tank type engine exhaust aftertreatment device according to claim 1, wherein said air flow mixing means comprises a mixer fixed in said mixing pipe, said mixer comprising a cylindrical portion and being fixed in the same The interference flow sheet in the cylindrical portion is described.
A tank type engine exhaust aftertreatment device according to claim 1 or 8, wherein said air flow mixing means comprises a diffusing pipe located in said second cavity assembly and communicating with said mixing pipe, The diffuser tube is provided with a plurality of diffusion holes distributed on the circumference thereof.
A tank type engine exhaust aftertreatment device according to claim 1 or 8, wherein said air flow mixing means comprises a bowl cover located in said second cavity assembly and aligned with said mixing tube. The bowl cover is provided with a spherical surface that protrudes toward the mixing tube.
A tank type engine exhaust aftertreatment device according to claim 1 or claim 8 wherein said air flow mixing means comprises an end bowl located in said second cavity assembly and aligned with said mixing tube. The end bowl is provided with a bearing space for receiving an air flow and a spherical surface protruding into the carrying space.
A tank type engine exhaust aftertreatment device according to claim 1, wherein said air flow mixing means comprises a diffuser pipe located in said second cavity assembly and communicating with said mixing pipe and located at said An end bowl in the second cavity assembly and aligned with the mixing tube, the diffusion tube is provided with a plurality of diffusion holes distributed on the circumference thereof; the end bowl is provided with a bearing space for receiving the air flow and protruding into the The spherical surface in the bearing space.
A tank type engine exhaust aftertreatment device according to claim 12, wherein said air flow mixing means comprises a mixer fixed in said mixing pipe, said mixer being located upstream of said diffuser pipe The tubular portion and the interference flow sheet fixed in the cylindrical portion are included.