CN219910913U - SCR mixer for engine tail gas aftertreatment - Google Patents
SCR mixer for engine tail gas aftertreatment Download PDFInfo
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- CN219910913U CN219910913U CN202321002458.1U CN202321002458U CN219910913U CN 219910913 U CN219910913 U CN 219910913U CN 202321002458 U CN202321002458 U CN 202321002458U CN 219910913 U CN219910913 U CN 219910913U
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- Prior art keywords
- axis
- housing
- urea
- area
- scr mixer
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000004202 carbamide Substances 0.000 claims abstract description 41
- 239000007921 spray Substances 0.000 claims abstract description 18
- 230000000694 effects Effects 0.000 abstract description 7
- 239000012530 fluid Substances 0.000 abstract description 6
- 230000008859 change Effects 0.000 abstract description 5
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 239000002574 poison Substances 0.000 abstract description 3
- 231100000614 poison Toxicity 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 13
- 230000009471 action Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model relates to the technical field of engine tail gas treatment, in particular to an SCR mixer for engine tail gas aftertreatment, which comprises the following components: a housing arranged in a tubular shape including an intake end and an exhaust end, defining an axis of the housing as a first axis; the urea spray pipe is arranged on the outer wall of the shell, and the axis of the urea spray pipe is defined as a second axis; a conical sleeve connected to the air inlet end of the housing; and the porous pipe is connected to the exhaust end of the shell. The utility model sets turbulence component before the urea spray spraying area, the turbulence component is used to change the direction of one part of fluid to make it cross and collide with another part of fluid, thus forming mixing effect before contacting with urea poison spray, through this mixing, the contact between the tail gas and urea is more sufficient and even, so as to reduce the crystallization phenomenon of urea caused by the failure of contacting with the tail gas.
Description
Technical Field
The utility model relates to the technical field of engine tail gas treatment, in particular to an SCR mixer for engine tail gas aftertreatment.
Background
In recent years, with the implementation of the action plan for preventing and treating the atmospheric pollution, the treatment of the exhaust emission of the diesel engine is carried out and implemented in more and more areas. Aiming at the increasing pollution of diesel exhaust to the environment, a plurality of experts and environmental protection organizations together call for the establishment and implementation of a 'clean engine action plan' as soon as possible in China, implement stricter emission standards of diesel vehicles, non-road machinery and ships, promote the cleanliness of diesel oil products and accelerate the prevention and treatment process of the atmospheric pollution in China cities.
Through analysis of enterprises and institutions in the same fields at home and abroad, the SCR system for the tail gas aftertreatment of the engine can be seen to become a main way and development direction of tail gas aftertreatment of the medium-and large-sized functional engines. The foreign engine exhaust aftertreatment SCR system is mainly integrated with related components through a packaging company or an electric control system company, and finally system supply is formed. The country has also produced production suppliers of the major components of SCR aftertreatment systems. Along with the forced implementation of the national five-stage motor vehicle emission standard, the national requirements for the engine exhaust aftertreatment SCR system will have a blowout type development trend, and the integral system integration suppliers of the engine exhaust aftertreatment SCR system will also be formed.
At present, in the use process of the SCR mixer, due to uneven mixing of urea and waste gas, the risk of urea crystallization is higher, and the problems of increased fuel consumption of the whole vehicle, reduced conversion efficiency of post-treatment NOx and the like are caused. Therefore, how to improve the mixing uniformity of urea and exhaust gas is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The utility model provides an SCR mixer for engine tail gas aftertreatment, which comprises:
a housing arranged in a tubular shape including an intake end and an exhaust end, defining an axis of the housing as a first axis;
the urea spray pipe is arranged on the outer wall of the shell, and the axis of the urea spray pipe is defined as a second axis;
a conical sleeve connected to the air inlet end of the housing;
a perforated pipe connected to the exhaust end of the housing;
a spoiler disposed to an inner wall of the housing;
the first axis intersects with the second axis, and the turbulence component is arranged between the air inlet end of the shell and the intersection point of the first axis and the second axis;
the cross section of the definition casing comprises a first area and a second area, the first area is circular, the second area is annular and surrounds the periphery of the first area, the spoiler part comprises a plurality of spoilers positioned in the second area, and the spoilers form a certain included angle with the first axis.
Preferably, a plurality of said spoilers are distributed in a circumferential array about the first axis.
Preferably, the spoiler has an angle of 45 ° with the first axis.
Preferably, the spoiler further comprises an annular member in the first region, and an outer wall of the annular member is connected with a plurality of spoilers.
Preferably, a porous portion is provided at an end of the porous tube remote from the housing, the porous portion including gas outlet holes uniformly distributed along a surface of the porous tube.
Preferably, the axis of the air outlet hole is perpendicular to the first axis.
Preferably, the ratio of the circumscribed circle diameters of the first and second regions is between one half and one third.
Preferably, the urea spray pipe is provided with a nozzle mounting area, and when the urea nozzle is mounted on the nozzle mounting area, the spraying direction of the urea nozzle is intersected with the first axis.
Compared with the prior art, the utility model has the advantages that:
the utility model sets turbulence component before the urea spray spraying area, the turbulence component is used to change the direction of one part of fluid to make it cross and collide with another part of fluid, thus forming mixing effect before contacting with urea poison spray, through this mixing, the contact between the tail gas and urea is more sufficient and even, so as to reduce the crystallization phenomenon of urea caused by the failure of contacting with the tail gas.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the utility model will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the architecture of an engine exhaust aftertreatment SCR mixer of the present disclosure;
FIG. 2 is a schematic illustration of a semi-sectional configuration of an engine exhaust aftertreatment SCR mixer according to the present disclosure;
FIG. 3 is a schematic view of a spoiler according to the present utility model;
FIG. 4 is a schematic diagram of a simulation of a mixer according to the present utility model;
FIG. 5 is a schematic illustration of flow rate streamlines in a mixer;
fig. 6 is a schematic illustration of ammonia distribution in the vicinity of a turbulence member.
Detailed Description
For a better understanding of the technical content of the present utility model, specific examples are set forth below, along with the accompanying drawings.
Referring to fig. 1-2, the present utility model proposes an engine exhaust aftertreatment SCR mixer comprising a housing 20, a urea nozzle 30, a conical sleeve 10, a perforated pipe 40 and a turbulence member 50, the housing 20 being arranged in a tubular shape, comprising an inlet end and an outlet end, defining the axis of the housing 20 as a first axis (axis a shown) and the urea nozzle 30 being arranged to the outer wall of the housing 20, defining the axis of the urea nozzle 30 as a second axis (axis B shown), the conical sleeve 10 being connected to the inlet end of the housing 20, the perforated pipe 40 being connected to the outlet end of the housing 20, the turbulence member 50 being arranged to the inner wall of the housing 20.
Optionally, the urea nozzle 30 is provided with a nozzle mounting area, and the spray direction of the urea nozzle intersects the first axis when the urea nozzle is mounted to the nozzle mounting area.
As shown in fig. 2, the intake area 101 is formed before the spoiler 50, the mixing area 102 is formed after the spoiler 50, and the spray from the urea nozzle is located in the mixing area 102.
The conical sleeve 10 is used for connecting a sleeve body of a front stage, the conical sleeve 10 is configured to comprise a large-diameter end and a small-diameter end, and has a wall surface smoothly transiting from the large-diameter end to the small-diameter end, so that the flowing air flow has a smooth and excessive effect, and the air flow is closely attached to the inner wall of the conical sleeve 10 to eliminate local vortex caused by abrupt diameter change. In this way, the air flow enters the housing 20 along the axial direction of the housing 20 and is waiting to come into contact with the urea spray from the urea nozzle mounted on the urea nozzle 30.
The first axis intersects with the second axis, and the turbulence member 50 is disposed between the air inlet end of the housing 20 and the intersection point of the first axis and the second axis, so that the air flow entering from the air inlet of the housing 20 is necessarily disturbed by the turbulence member 50, and then contacts the urea spray, so that the uniformity of contact and mixing with the urea spray can be improved.
As shown in fig. 2-3, the cross section of the housing 20 includes a first area and a second area, the first area is circular, the second area is annular and surrounds the periphery of the first area, the spoiler 50 includes a plurality of spoilers 52 located in the second area, and the spoilers 52 form an angle with the first axis.
Further, as shown in connection with fig. 3, the spoiler 50 further includes an annular member 51 located in the first region, and a plurality of spoilers 52 are connected to an outer wall of the annular member 51. In this way, the air flow in the central region of the housing 20 passes through the annular member 51 in the direction along the axis of the housing 20.
In this way, when the air flow near the inner wall of the housing 20 flows along the inner wall of the housing 20, the air flow contacts the spoiler 52 to change the flowing direction, so that the air flow forms a certain included angle with the axis of the housing 20, and the air flow near the inner wall and the air flow in the central area are staggered and mixed.
Preferably, the plurality of spoilers 52 are arranged in a circumferential array about the first axis such that the air flow across the spoilers in the circumferential direction has a variable line of action for cross-mixing with the air flow from the first region.
In the preferred embodiment, the spoiler 52 is angled 45 from the first axis. In this way, the angle of the air flow passing through the spoiler 52 is varied by 45 °, in particular to achieve maximum mixing and interlacing effect when passing through the urea spray.
Optionally, the ratio of the circumscribed circle diameters of the first region and the second region is between one half and one third.
Further, the end of the porous tube 40 remote from the housing 20 is provided with a porous portion comprising gas outlet holes 41 evenly distributed along the surface of the porous tube 40. Wherein the axis of the outlet holes 41 is perpendicular to the first axis.
In this way, the air outlet holes 41 of the porous tube 40 are uniformly arranged in radial direction, when the air flows through the air outlet holes 41, the porous tube can make the air flow flowing through the porous tube more uniform, the porous tube 40 is sleeved with a large taper sleeve, and the large taper sleeve is coaxially arranged with the porous tube 40, so that the air flow flowing out of the air outlet holes 41 in the porous tube 40 can be changed from the air flow flowing in radial direction to the air flow flowing in axial direction.
As can be seen from fig. 4-6, after the air flows pass through the position of the turbulence member 50, obvious line change and staggering occur, so that a better mixing effect is achieved, and as can be seen from the axial cross-section direction, under the staggering and mixing effects of the air flows, the urine poison is relatively uniformly distributed.
In combination with the above embodiment, the turbulence component is arranged in front of the area sprayed by urea spray, and is used for redirecting one part of fluid to be staggered and collided with the other part of fluid, so that a mixing effect is formed before the urea spray is contacted, and the exhaust gas and urea are contacted more fully and uniformly through the mixing, so that the phenomenon that urea is crystallized due to the fact that the urea cannot contact the exhaust gas is reduced.
While the utility model has been described with reference to preferred embodiments, it is not intended to be limiting. Those skilled in the art will appreciate that various modifications and adaptations can be made without departing from the spirit and scope of the present utility model. Accordingly, the scope of the utility model is defined by the appended claims.
Claims (8)
1. An engine exhaust aftertreatment SCR mixer, comprising:
-a housing (20), the housing (20) being arranged in a tubular shape comprising an inlet end and an outlet end, defining an axis of the housing (20) as a first axis;
a urea nozzle (30) arranged to the outer wall of the housing (20), defining the axis of the urea nozzle (30) as a second axis;
a conical sleeve (10) connected to the air inlet end of the housing (20);
a perforated tube (40) connected to the exhaust end of the housing (20);
a spoiler (50) provided to an inner wall of the housing (20);
wherein the first axis intersects the second axis, and the spoiler (50) is disposed between the air inlet end of the housing (20) and the intersection of the first axis and the second axis;
the cross section of the defining shell (20) comprises a first area and a second area, the first area is circular, the second area is annularly enclosed at the periphery of the first area, the spoiler (50) comprises a plurality of spoilers (52) positioned in the second area, and the spoilers (52) form a certain included angle with the first axis.
2. The engine exhaust aftertreatment SCR mixer of claim 1, wherein a plurality of the spoilers (52) are distributed in a circumferential array about the first axis.
3. The engine exhaust aftertreatment SCR mixer of claim 1, wherein the spoiler (52) is angled 45 ° from the first axis.
4. The engine exhaust aftertreatment SCR mixer according to claim 1, characterized in that the spoiler (50) further comprises an annular member (51) in the first region, the outer wall of the annular member (51) being connected to a plurality of spoilers (52).
5. The engine exhaust aftertreatment SCR mixer according to claim 1, characterized in that the end of the porous tube (40) remote from the housing (20) is provided with a porous portion comprising gas outlet holes (41) evenly distributed along the surface of the porous tube (40).
6. The engine exhaust aftertreatment SCR mixer of claim 5, wherein the axis of the outlet holes (41) is perpendicular to the first axis.
7. The engine exhaust aftertreatment SCR mixer of any of claims 1-6, wherein the circumscribed circle diameter ratio of the first region and the second region is between one half and one third.
8. The engine exhaust aftertreatment SCR mixer of claim 1, wherein the urea nozzle (30) is provided with a nozzle mounting area, the spray direction of the urea nozzle intersecting the first axis when the urea nozzle is mounted to the nozzle mounting area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321002458.1U CN219910913U (en) | 2023-04-28 | 2023-04-28 | SCR mixer for engine tail gas aftertreatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321002458.1U CN219910913U (en) | 2023-04-28 | 2023-04-28 | SCR mixer for engine tail gas aftertreatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219910913U true CN219910913U (en) | 2023-10-27 |
Family
ID=88427468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321002458.1U Active CN219910913U (en) | 2023-04-28 | 2023-04-28 | SCR mixer for engine tail gas aftertreatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219910913U (en) |
-
2023
- 2023-04-28 CN CN202321002458.1U patent/CN219910913U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Engine exhaust post-treatment SCR mixer Granted publication date: 20231027 Pledgee: Nanjing Bank Co.,Ltd. Nanjing Financial City Branch Pledgor: Nanjing Hanshen Material Technology Co.,Ltd. Registration number: Y2024980005248 |