CN211777660U - Tail gas post-treatment device for light diesel engine - Google Patents
Tail gas post-treatment device for light diesel engine Download PDFInfo
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- CN211777660U CN211777660U CN202020117969.8U CN202020117969U CN211777660U CN 211777660 U CN211777660 U CN 211777660U CN 202020117969 U CN202020117969 U CN 202020117969U CN 211777660 U CN211777660 U CN 211777660U
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- air inlet
- spoiler
- end cover
- air outlet
- end cylinder
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Abstract
The utility model relates to a tail gas post-treatment device for a light diesel engine, which comprises an air inlet flange, an air inlet bent pipe, an air inlet end cover, a front end cylinder body and a rear end cylinder body; the rear side of the front-end cylinder is connected with the front side of the rear-end cylinder, a catalyst carrier wrapped with a gasket is pressed in the rear-end cylinder, the front side of the front-end cylinder is connected with an air inlet end cover, the air inlet end cover is connected with an air inlet bent pipe, and an inlet of the air inlet bent pipe is assembled with an air inlet flange; the urea nozzle is welded and installed on the outer wall of the air inlet end cover; the rear side of the rear-end cylinder body is connected with an air outlet end cover, the air outlet end cover is connected with an air outlet bent pipe, and an air outlet flange is arranged at an outlet of the air outlet bent pipe; the front end barrel is internally provided with a first spoiler and a second spoiler at intervals in sequence from front to back. The structure is simple, the design is compact, and the installation is convenient; the mixer has good urea decomposition effect and low urea crystallization risk; the SCR carrier ammonia gas has high mixing uniformity and good effect of reducing NOx emission.
Description
Technical Field
The utility model belongs to the technical field of the tail gas aftertreatment, concretely relates to a tail gas aftertreatment device for light-duty diesel engine.
Background
Six national regulations for diesel vehicles are about to be implemented, which make stricter regulations on emission limits of NOx, and Selective Catalytic Reduction (SCR) has been an off-board control for diesel engines
An efficient method of venting. NOx in the exhaust gas of the diesel engine and ammonia gas decomposed by the urea aqueous solution are subjected to catalytic reduction reaction under the action of a catalyst in the SCR carrier, and the NOx is converted into non-toxic nitrogen gas and water. The effect of the urea aqueous solution to decompose ammonia and the uniform distribution degree of ammonia in the SCR carrier directly influence the crystallization degree of urea and the emission value of pollutants.
At present, the conditions of urea crystallization and excessive emission generally exist in an exhaust after-treatment system of a diesel engine, and the technical difficulty needs to be solved through optimizing the structural design urgently.
Disclosure of Invention
The invention relates to a tail gas post-treatment device for a light diesel engine, which aims to effectively reduce the risk of urea crystallization and ensure that the pollutant emission can meet the requirements of regulations.
The utility model adopts the following technical scheme: a tail gas after-treatment device for a light diesel engine is characterized by comprising
The device comprises an air inlet flange, an air inlet bent pipe, an air inlet end cover, a front end cylinder body, a rear end cylinder body, an air outlet end cover, an air outlet bent pipe, an air outlet flange, a urea nozzle, a first spoiler, a second spoiler, a gasket and a catalyst carrier;
the rear side of the front end cylinder body is connected with the front side of the rear end cylinder body, a catalyst carrier wrapped with a gasket is pressed in the rear end cylinder body,
the front side of the front end cylinder is connected with an air inlet end cover, the air inlet end cover is connected with an air inlet bent pipe, and an inlet of the air inlet bent pipe is provided with an air inlet flange; the urea nozzle is welded and installed on the outer wall of the air inlet end cover;
the rear side of the rear-end cylinder body is connected with an air outlet end cover, the air outlet end cover is connected with an air outlet bent pipe, and an air outlet flange is arranged at an outlet of the air outlet bent pipe;
and a first spoiler and a second spoiler are sequentially arranged in the front-end cylinder body at intervals from front to back.
Furthermore, a flow guide blocking piece and a plurality of small holes are formed in the first spoiler, the flow guide blocking piece is located in the center of the first spoiler, and the small holes are distributed in the edge of the lower portion of the first spoiler.
Furthermore, a plurality of waist-shaped holes, a plurality of small round holes and a square hole are formed in the second spoiler, the second spoiler is Z-shaped, the waist-shaped holes are dispersedly arranged on the upper portion and the lower portion of the second spoiler, the small round holes are distributed on the edge of the lower portion of the second spoiler, and the square hole is located in the middle platform of the second spoiler.
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and the detailed description.
Has the advantages that:
1. simple structure, compact design and convenient installation.
2. The urea decomposition effect of the mixer is good, and the risk of urea crystallization is low.
3. The SCR carrier ammonia gas has high mixing uniformity and good effect of reducing NOx emission.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a longitudinal sectional view of fig. 1.
Fig. 3 is a schematic view of the first spoiler.
Fig. 4 is a schematic view of the second spoiler.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the following will describe in further detail common embodiments of the present invention with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
In addition, in the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
As shown in fig. 1-4: an exhaust gas after-treatment device for a light-duty diesel engine, comprising:
the device comprises an air inlet flange 1, an air inlet bent pipe 2, an air inlet end cover 3, a front end cylinder 4, a rear end cylinder 5, an air outlet end cover 6, an air outlet bent pipe 7, an air outlet flange 8, a urea nozzle 9, a first spoiler 10, a second spoiler 11, a gasket 12 and a catalyst carrier 13;
the rear side of the front end cylinder 4 is connected with the front side of the rear end cylinder 5, a catalyst carrier 13 wrapped by a gasket 12 is pressed in the rear end cylinder,
the front side of the front end cylinder 4 is connected with an air inlet end cover 3, the air inlet end cover is connected with an air inlet elbow 2, and an inlet of the air inlet elbow 2 is provided with an air inlet flange 1; the urea nozzle 9 is welded on the outer wall of the air inlet end cover 3;
the rear side of the rear-end cylinder body 5 is connected with an air outlet end cover 6, the air outlet end cover 6 is connected with an air outlet bent pipe 7, and an air outlet flange 8 is arranged at the outlet of the air outlet bent pipe 7;
and a first spoiler 10 and a second spoiler 11 are sequentially arranged in the front-end cylinder 4 at intervals from front to back.
The first spoiler 10 is provided with a flow guide baffle 10.1 and a plurality of small holes 10.2, the flow guide baffle 10.1 is located at the center of the first spoiler 10, and the small holes 10.2 are distributed at the lower edge of the first spoiler 10. The guide baffle and the small holes play a role in guiding and diffusing airflow.
The second spoiler 11 is provided with a plurality of kidney-shaped holes 11.1, a plurality of small circular holes 11.2 and a square hole 11.3. The second spoiler 11 is zigzag-shaped, the kidney-shaped holes 11.1 are dispersedly arranged at the upper part and the lower part of the second spoiler 11, the small circular holes 11.2 are arranged at the lower edge of the second spoiler 11, and the square holes 11.3 are positioned at the middle platform of the second spoiler 11. The holes are formed in the second spoiler, so that the rotation and diffusion of air flow can be promoted, urea can be fully crushed and decomposed in the cylinder 4, and ammonia gas can be uniformly mixed before entering the SCR carrier.
The gasket 12 is wrapped outside the catalyst carrier 13 and pressed into the rear end cylinder 5 together. The air inlet flange 1 is welded with the air inlet bent pipe 2, the air inlet bent pipe 2 is welded with the air inlet end cover 3, the air inlet end cover 3 is welded with the front end cylinder 4, the front end cylinder 4 is welded with the rear end cylinder 5, the rear end cylinder 5 is welded with the air outlet end cover 6, the air outlet end cover 6 is welded with the air outlet bent pipe 7, and the air outlet bent pipe 7 is welded with the air outlet flange 8. And the urea nozzle 9 is welded and installed on the outer wall of the air inlet end cover 3. The first spoiler 10 is welded with the air inlet end cover 3 and the front end cylinder 4, the second spoiler 11 is welded with the front end cylinder 4, and the first spoiler 10 is located in front of the second spoiler 11.
The engine exhaust gas flows in from the air inlet elbow 2, the urea aqueous solution is sprayed from the urea nozzle 9, the urea aqueous solution and the engine exhaust gas are mixed in the air inlet end cover 3 and then enter the front end cylinder 4, the mixed gas flow is fully mixed and disturbed under the action of the first spoiler 10 and the second spoiler 11 in the front end cylinder 4, the urea aqueous solution is crushed and decomposed into ammonia, the gas flow is uniformly mixed and then enters the catalyst carrier 13 to undergo catalytic reduction reaction, NOx in the tail gas is converted into harmless gas, and then the harmless gas flows out from the air outlet end cover 6 and the air outlet elbow 7 in sequence.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes made to the above embodiments according to the utility model all still belong to the protection scope of the technical scheme of the utility model.
Claims (3)
1. A tail gas after-treatment device for a light diesel engine is characterized by comprising
The device comprises an air inlet flange (1), an air inlet bent pipe (2), an air inlet end cover (3), a front end cylinder body (4), a rear end cylinder body (5), an air outlet end cover (6), an air outlet bent pipe (7), an air outlet flange (8), a urea nozzle (9), a first spoiler (10), a second spoiler (11), a gasket (12) and a catalyst carrier (13);
the rear side of the front end cylinder (4) is connected with the front side of the rear end cylinder (5), a catalyst carrier (13) wrapped by a gasket (12) is pressed in the rear end cylinder (5),
the front side of the front end cylinder body (4) is connected with an air inlet end cover (3), the air inlet end cover (3) is connected with an air inlet bent pipe (2), and an inlet of the air inlet bent pipe (2) is provided with an air inlet flange (1); the urea nozzle (9) is welded and installed on the outer wall of the air inlet end cover (3);
the rear side of the rear-end cylinder body (5) is connected with an air outlet end cover (6), the air outlet end cover (6) is connected with an air outlet bent pipe (7), and an air outlet flange (8) is arranged at an outlet of the air outlet bent pipe (7);
and a first spoiler (10) and a second spoiler (11) are sequentially arranged in the front-end cylinder (4) at intervals from front to back.
2. The exhaust gas after-treatment device for light-duty diesel engine according to claim 1, characterized in that: the first spoiler (10) is provided with a flow guide baffle (10.1) and a plurality of small holes (10.2), the flow guide baffle (10.1) is positioned at the center of the first spoiler (10), and the small holes (10.2) are distributed at the edge of the lower part of the first spoiler (10).
3. The exhaust gas after-treatment device for light-duty diesel engine according to claim 1, characterized in that: set up a plurality of waist shape holes (11.1), a plurality of small circle hole (11.2) and a quad slit (11.3) on second spoiler (11), second spoiler (11) are the Z style of calligraphy, and waist shape hole (11.1) dispersion is arranged in the upper portion and the lower part of second spoiler (11), and little round hole (11.2) distribute in the lower part edge of second spoiler (11), and quad slit (11.3) are located second spoiler (11) middle part platform department.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020117969.8U CN211777660U (en) | 2020-01-19 | 2020-01-19 | Tail gas post-treatment device for light diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020117969.8U CN211777660U (en) | 2020-01-19 | 2020-01-19 | Tail gas post-treatment device for light diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211777660U true CN211777660U (en) | 2020-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020117969.8U Active CN211777660U (en) | 2020-01-19 | 2020-01-19 | Tail gas post-treatment device for light diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211777660U (en) |
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2020
- 2020-01-19 CN CN202020117969.8U patent/CN211777660U/en active Active
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