CN105804840B

CN105804840B - Exhaust gas treatment device

Info

Publication number: CN105804840B
Application number: CN201610321530.5A
Authority: CN
Inventors: 吴健; 李硕; 曹刚; 李颖
Original assignee: Tenneco Suzhou Emission System Co Ltd
Current assignee: Tenneco Suzhou Emission System Co Ltd
Priority date: 2016-05-16
Filing date: 2016-05-16
Publication date: 2020-08-04
Anticipated expiration: 2036-05-16
Also published as: CN105804840A

Abstract

An exhaust treatment device comprises a shell and an exhaust treatment module positioned in the shell, wherein the shell comprises a mixing cavity, a flow dividing cavity and a distribution cavity. Exhaust treatment device is including being located the toper blender of mixing chamber and being located the mixing tube of reposition of redundant personnel intracavity, wherein the toper blender includes a plurality of toper spinning disks and a plurality of openings corresponding to these toper spinning disks. By the arrangement, on one hand, urea can be flatly laid on the pipe wall of the mixing cavity to increase the evaporation area and the retention time of the urea, and the mixing effect is improved; on the other hand, the exhaust gas can flow more smoothly, the local pressure loss is reduced, and the back pressure is reduced.

Description

Exhaust gas treatment device

Technical Field

The invention relates to an exhaust treatment device, and belongs to the technical field of engine exhaust aftertreatment.

Background

Studies have shown that the degree of uniformity of ammonia distribution in the lines of an exhaust aftertreatment system (e.g., a selective catalytic reduction system, SCR system) has a significant impact on the overall performance and durability of the system. Uneven distribution of ammonia can result in local areas with excessive ammonia and thus ammonia slip, while other ammonia lean areas can result in inefficient nitrogen-oxygen (NOx) conversion.

In order to improve the uniformity of mixing of the tail gas and the urea, some exhaust aftertreatment systems in the prior art are provided with straight plate type mixers, but the exhaust gas is not smooth enough when passing through the swirl plates of the mixers, so that large pressure loss can be caused.

Therefore, there is a need to provide a new exhaust treatment device to solve the above technical problems.

Disclosure of Invention

The invention aims to provide an exhaust treatment device with low back pressure and uniform mixing.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides an exhaust treatment device, its includes the casing and is located tail gas treatment module in the casing, the casing includes the hybrid chamber, is located branch flow chamber in hybrid chamber low reaches and being located branch flow chamber low reaches distribution chamber, tail gas treatment module is located the low reaches in distribution chamber, exhaust treatment device is including being located cone mixer in the hybrid chamber and being located the hybrid tube in the branch flow chamber, wherein the cone mixer includes a plurality of toper spinning disks and a plurality of openings corresponding to these toper spinning disks, exhaust treatment device is still including being fixed in just be used for installing the nozzle installation department of urea nozzle on the casing, the nozzle installation department is located the low reaches of cone mixer, the urea nozzle be used for to spray atomizing urea solution in the hybrid tube.

As a further improvement of the invention, the conical mixer is welded to the mixing tube.

As a further improved technical scheme of the invention, the conical mixer also comprises a plurality of first openings surrounding the periphery of the conical cyclone plate, and the first openings are close to the mixing pipe.

As a further improved technical solution of the present invention, the exhaust treatment device further includes a first partition plate and a second partition plate located in the diversion cavity and used for supporting the mixing pipe, wherein the first partition plate is provided with a plurality of first through holes, and the second partition plate is provided with a plurality of second through holes; the exhaust treatment device includes an annular space between the mixing tube and the housing, the first perforations communicating the mixing chamber with the annular space, and the second perforations communicating the annular space with the distribution chamber.

As a further improved technical scheme of the invention, the first partition plate and the second partition plate are arc-shaped and have opposite inclination directions.

As a further improvement of the present invention, the exhaust treatment device comprises a sleeve portion fitted to the nozzle mounting portion, the sleeve portion passing through the annular space and extending into the mixing tube, wherein the sleeve portion located in the annular space is provided with a plurality of second openings.

As a further improved technical solution of the present invention, the housing includes a first housing and a second housing, wherein the first housing is provided with a first conical pipe, a first straight pipe and a second conical pipe, the second housing includes a third conical pipe, a second straight pipe and a fourth conical pipe, and the second conical pipe and the third conical pipe are connected together through a flange and have a structure with a thin middle and thick two ends.

As a further improved technical solution of the present invention, the distribution chamber includes spaces located in the second taper pipe and the third taper pipe.

As a further improved technical scheme of the invention, the tail gas treatment module comprises a selective catalytic reduction module arranged in the second straight pipe.

As a further improved technical scheme of the invention, the exhaust treatment device also comprises a soot blower positioned at the upstream of the selective catalytic reduction module.

Compared with the prior art, the urea mixing device has the advantages that the conical spinning disk is arranged, on one hand, urea can be flatly laid on the pipe wall of the mixing cavity, so that the evaporation area and the retention time of the urea are increased, and the mixing effect is improved; on the other hand, the exhaust gas can flow more smoothly, the local pressure loss is reduced, and the back pressure is reduced.

Drawings

FIG. 1 is a perspective view of an exhaust treatment device of the present invention.

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

Fig. 3 is a partially exploded perspective view of fig. 1.

Fig. 4 is an exploded perspective view from another angle of fig. 3.

Fig. 5 is a further exploded perspective view of fig. 1.

Fig. 6 is a schematic sectional view taken along line a-a in fig. 1.

Detailed Description

Referring to fig. 1-6, an exhaust treatment device 100 for treating exhaust from an engine, especially a high power engine, is disclosed. Overall, the exhaust gas treatment device 100 comprises a housing 1 and an exhaust gas treatment module 2 located within the housing 1. Overall, the housing 1 comprises a mixing chamber 3, a distribution chamber 4 downstream of the mixing chamber 4 and a distribution chamber 5 downstream of the distribution chamber 4. In the illustrated embodiment of the invention, the exhaust treatment module 2 is a selective catalytic reduction module and is located downstream of the distribution chamber 5.

Specifically, the housing 1 includes a first housing 11 and a second housing 12 connected together by a flange, wherein the first housing 11 is provided with a first taper pipe 111, a first straight pipe 112 and a second taper pipe 113, and the second housing 12 includes a third taper pipe 121, a second straight pipe 122 and a fourth taper pipe 123. The second taper pipe 113 and the third taper pipe 121 are connected together by a flange, and have a structure with a thin middle part and thick two ends.

The exhaust treatment device 100 further comprises a conical mixer 6 located in the mixing chamber 4 and a mixing pipe 7 located in the dispersion chamber 4. In the illustrated embodiment of the invention, the conical mixer 6 is welded to the mixing tube 7. Wherein the conical mixer 6 comprises a plurality of conical vanes 61, a plurality of openings 62 corresponding to the conical vanes 61, and a plurality of first openings 63 surrounding the periphery of the conical vanes 61, the first openings 63 being adjacent to the mixing tube 7. The conical swirling sheets 61 of the conical mixer 6 can flatly spread urea on the wall of the mixing cavity to increase the evaporation area and residence time of urea and improve the mixing effect; on the other hand, the exhaust gas can flow more smoothly, the local pressure loss is reduced, and the back pressure is reduced. The first opening 63 can also function to reduce back pressure.

The exhaust gas treatment device 100 further includes a first partition plate 81 and a second partition plate 82 located in the distribution chamber 4 and configured to support the mixing pipe 7, wherein the first partition plate 81 is provided with a plurality of first through holes 811, and the second partition plate 82 is provided with a plurality of second through holes 821. The exhaust gas treatment device 100 comprises an annular space 83 between the mixing pipe 7 and the housing 1. The first perforation 811 connects the mixing chamber 3 to the annular space 83 and the second perforation 821 connects the annular space 83 to the distribution chamber 5. In the illustrated embodiment of the present invention, the first partition plate 81 and the second partition plate 82 are both arc-shaped, have opposite inclined directions, and are symmetrically arranged to reduce the back pressure as much as possible.

Exhaust treatment device 100 still includes be fixed in on the casing 1 and be used for installing the nozzle installation portion 13 of urea nozzle (not shown), nozzle installation portion 13 is located the low reaches of conical mixer 6, the urea nozzle be used for to the atomized urea solution is sprayed in mixing pipe 7. The exhaust treatment device 100 comprises a sleeve portion 14 cooperating with the nozzle mounting portion 13, the sleeve portion 14 extending through the annular space 83 and into the mixing tube 7, wherein the sleeve portion 14 located in the annular space 83 is provided with a plurality of second openings 141.

In the illustrated embodiment of the invention, the distribution chamber 5 comprises a space located inside the second cone 113 and the third cone 121. According to the arrangement, the sectional area is reduced and enlarged, the eddy current area is reduced, the local pressure loss is reduced, and meanwhile, the urea is smooth and excessive, and the crystallization risk is reduced.

In the illustrated embodiment of the invention, the exhaust gas treatment module 2 is mounted inside the second straight pipe 122. The exhaust treatment device 100 also includes a sootblower 9 located upstream of the selective catalytic reduction module.

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

1. An exhaust treatment device, its includes the casing and is located tail gas treatment module in the casing, the casing includes the hybrid chamber, is located the reposition of redundant personnel chamber of hybrid chamber low reaches and is located reposition of redundant personnel chamber low reaches, tail gas treatment module is located the low reaches of distribution chamber, its characterized in that: the exhaust treatment device comprises a conical mixer positioned in the mixing cavity and a mixing pipe positioned in the flow dividing cavity, wherein the conical mixer comprises a plurality of conical spinning disks and a plurality of openings corresponding to the conical spinning disks, the exhaust treatment device further comprises a nozzle installation part which is fixed on the shell and used for installing a urea nozzle, the nozzle installation part is positioned at the downstream of the conical mixer, and the urea nozzle is used for spraying atomized urea solution into the mixing pipe;

the exhaust treatment device also comprises a first partition plate and a second partition plate which are positioned in the flow dividing cavity and used for supporting the mixing pipe, wherein the first partition plate is provided with a plurality of first through holes, and the second partition plate is provided with a plurality of second through holes; the exhaust treatment device includes an annular space between the mixing tube and the housing, the first perforations communicating the mixing chamber with the annular space, the second perforations communicating the annular space with the distribution chamber;

the first partition plate and the second partition plate are arc-shaped and opposite in inclination direction, wherein the first partition plate is provided with a first bell mouth facing the conical mixer, and the second partition plate is provided with a second bell mouth facing the distribution cavity;

the exhaust treatment device comprises a sleeve part matched with the nozzle mounting part, the sleeve part penetrates through the annular space and extends into the mixing pipe, and a plurality of second openings are formed in the sleeve part positioned in the annular space.

2. The exhaust gas treatment device according to claim 1, characterized in that: the conical mixer is welded with the mixing tube.

3. The exhaust gas treatment device according to claim 1, characterized in that: the conical mixer further comprises a plurality of first openings surrounding the periphery of the conical spinning disk, and the first openings are close to the mixing pipe.

4. The exhaust gas treatment device according to claim 1, characterized in that: the casing includes first casing and second casing, wherein first casing is equipped with first taper pipe, first straight tube and second taper pipe, the second casing includes third taper pipe, second straight tube and fourth taper pipe, wherein the second taper pipe with the third taper pipe passes through flange joint together to be thin in the middle of being, the thick structure in both ends.

5. The exhaust gas treatment device according to claim 4, characterized in that: the distribution chamber includes a space within the second and third cones.

6. The exhaust gas treatment device according to claim 4, characterized in that: the tail gas treatment module comprises a selective catalytic reduction module arranged in the second straight pipe.

7. The exhaust gas treatment device according to claim 6, characterized in that: the exhaust treatment device also includes a soot blower upstream of the selective catalytic reduction module.