CN217107165U - Mixer, aftertreatment catalytic muffler and diesel engine - Google Patents
Mixer, aftertreatment catalytic muffler and diesel engine Download PDFInfo
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- CN217107165U CN217107165U CN202122826105.0U CN202122826105U CN217107165U CN 217107165 U CN217107165 U CN 217107165U CN 202122826105 U CN202122826105 U CN 202122826105U CN 217107165 U CN217107165 U CN 217107165U
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Abstract
The utility model belongs to the technical field of the engine, concretely relates to blender, aftertreatment catalysis muffler and diesel engine, the blender includes: an air intake chamber having an exhaust gas inlet and an exhaust gas outlet; the flow guide assembly is arranged in the air inlet cavity, the flow guide assembly forms a mixing cavity, a reaction gas inlet is formed in the mixing cavity, and the mixing cavity is communicated with the air inlet cavity; the cowling panel, the cowling panel install in exhaust outlet department, just a plurality of rectification through-holes have been seted up on the cowling panel. It has set up the cowling panel in exhaust outlet position, and the cowling panel cooperatees with the water conservancy diversion subassembly and uses, has improved the ammonia distribution homogeneity of blender gas outlet department for tail gas can be more for even distribution on the terminal surface of catalyst after the blender, and it is relatively poor to have solved among the prior art ammonia distribution homogeneity in the blender, leads to the lower problem of diesel engine nitrogen oxygen conversion efficiency.
Description
Technical Field
The utility model belongs to the technical field of the engine, concretely relates to blender, aftertreatment catalysis muffler and diesel engine.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
In order to meet the increasing emission standards of diesel engines, diesel engines are often equipped with external purification devices, which include a pretreatment system and an aftertreatment system. The post-treatment catalytic silencer is one of the core components of a diesel engine post-treatment system, is a main tail gas treatment component and is mainly used for trapping particles in the tail gas of a diesel engine, nitrogen oxides in the tail gas of the diesel engine react with a reducing agent in the post-treatment catalytic silencer, and in addition, the post-treatment catalytic silencer has the function of reducing the noise of the diesel engine.
The mixer is a core component in the aftertreatment catalytic silencer, and mainly has the functions of accelerating the decomposition of the urea aqueous solution in the exhaust gas and enabling ammonia gas generated by the decomposition of the urea aqueous solution to be uniformly distributed in the exhaust gas, and in addition, the mixer also has the function of adjusting the uniformity of the gas flow velocity of the tail gas of the diesel engine and enabling the gas flow velocity to be uniformly distributed on the front end face of the SCR.
However, the ammonia distribution uniformity of the existing mixer is poor, and the ammonia gas is unevenly distributed on the end face of the catalyst, so that the nitrogen-oxygen conversion efficiency of the diesel engine is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a diesel engine, aftertreatment catalytic muffler and blender to at least part solution ammonia distribution uniformity among the prior art among the blender is relatively poor, leads to the lower problem of diesel engine nitrogen oxygen conversion efficiency. The purpose is realized by the following technical scheme:
a first aspect of the present invention provides a mixer, the mixer includes:
an air intake chamber having an exhaust gas inlet and an exhaust gas outlet;
the flow guide assembly is arranged in the air inlet cavity, the flow guide assembly forms a mixing cavity, a reaction gas inlet is formed in the mixing cavity, and the mixing cavity is communicated with the air inlet cavity;
the cowling panel, the cowling panel install in exhaust outlet department, just a plurality of rectification through-holes have been seted up on the cowling panel.
According to the utility model provides a mixer, it has set up the cowling panel in the exhaust outlet position, and the cowling panel cooperatees with the water conservancy diversion subassembly and uses, has avoided only setting up the air current bounce-back that curved guide plate caused, has improved the ammonia distribution homogeneity of mixer gas outlet department for tail gas can be more for even distribution on the terminal surface of catalyst after the mixer, and it is relatively poor to have solved among the prior art ammonia distribution homogeneity in the mixer, leads to the lower problem of diesel engine nitrogen oxygen conversion efficiency.
Further, the flow guide assembly includes:
the reaction gas inlet is arranged at one end of the first flow guide pipe, a plurality of first communicating holes are formed in the pipe wall of the first flow guide pipe, the mixing chamber is formed in the pipe body of the first flow guide pipe, and the mixing chamber is communicated with the gas inlet chamber through the first communicating holes.
Further, a nozzle is installed at the reaction gas inlet.
Further, the water conservancy diversion subassembly still includes:
and the second guide pipe is provided with a plurality of second communicating holes, and the second guide pipe is sleeved in the first guide pipe.
Further, the water conservancy diversion subassembly still includes:
the diversion baffle is arranged on the inner periphery of the first diversion pipe and has a preset taper.
Further, the water conservancy diversion subassembly still includes:
and the flow guide arc plate is arranged at the other end of the first flow guide pipe.
Furthermore, a first partition plate and a second partition plate which are connected are arranged in the air inlet cavity, the first partition plate is located in front of the flow guide assembly along the air flow direction, and the second partition plate is located behind the flow guide assembly along the air flow direction.
Further, the rectifying plate is a circular plate and comprises a plate body upper part and a plate body lower part;
the ratio of the opening area of the rectifying through hole at the upper part of the plate body to the opening area of the rectifying through hole at the lower part of the plate body is 0.5-2.5.
A second aspect of the present invention provides an aftertreatment catalytic muffler, comprising a mixer as described above.
A third aspect of the present invention provides a diesel engine comprising an aftertreatment catalytic muffler as described above.
According to the utility model discloses aftertreatment catalytic muffler and diesel engine have the same advantage with above-mentioned blender, no longer describe herein.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of a mixer provided by the present invention;
FIG. 2 is a schematic view of a rectifying plate of the mixer shown in FIG. 1;
fig. 3 is a schematic structural diagram of a specific embodiment of the aftertreatment catalytic muffler of the present invention.
The reference symbols in the drawings denote the following:
1-an air inlet cavity, 101-an exhaust gas inlet and 102-an exhaust gas outlet;
2-a first draft tube;
3-a second draft tube;
4-a flow guide baffle;
5-a flow guide arc plate;
6-a first separator;
7-a second separator;
8-rectifying plate, 801-rectifying through hole;
9-a reaction gas inlet;
10-a nozzle;
100-air intake component, 200-DOC packaging unit, 300-DPF packaging unit, 400-mixer;
500-SCR package unit, 600-exhaust assembly.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
To the relatively poor technical problem of blender ammonia distribution uniformity, the utility model provides a blender and applied the aftertreatment catalysis silencer of this blender to improve diesel engine aftertreatment system's ammonia distribution uniformity, improve diesel engine nitrogen oxide's conversion efficiency, reduce the risk of urea crystallization.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a mixer according to an embodiment of the present invention.
In a specific embodiment, the utility model provides a mixer includes air inlet chamber 1, water conservancy diversion subassembly and cowling panel 8. The intake chamber 1 has an exhaust gas inlet 101 and an exhaust gas outlet 102, and exhaust gas generated by the engine enters the mixer through a waste inlet after being treated by DOC (Diesel Oxidation Catalyst) and DPF (Diesel Particulate Filter), is mixed with reaction gas in the mixer, is discharged through the exhaust gas outlet 102, and enters an SCR (selective catalytic Reduction) assembly.
The flow guide assembly is arranged in the air inlet cavity 1, the air inlet cavity 1 is vertically arranged, the flow guide assembly forms a mixing cavity, a reaction gas inlet 9 is formed in the mixing cavity, and the mixing cavity is communicated with the air inlet cavity 1. In theory, the flow guiding assembly may be any member capable of forming a turbulent flow on the gas, and may be various plates or pipes with specific shapes, and the flow guiding assembly preferably adopts a structural form combining a plurality of members to improve the turbulent flow effect.
The cowling panel 8 install in exhaust outlet 102 department, just a plurality of rectification through-holes 801 have been seted up on the cowling panel 8, can set up the rectification through-hole 801 of different positions and quantity to satisfy the rectification requirement under the different service condition.
In the above-mentioned embodiment, the utility model provides a mixer has set up cowling panel 8 in exhaust outlet 102 position, cowling panel 8 and water conservancy diversion subassembly cooperate and use, avoided only setting up the air current bounce-back that curved guide plate caused, improved the ammonia distribution uniformity of mixer gas outlet department, make tail gas can be more for even distribution on the terminal surface of catalyst behind the mixer, it is relatively poor to have solved among the prior art ammonia distribution uniformity in the mixer, lead to the lower problem of diesel engine nitrogen oxygen conversion efficiency.
In order to improve the flow guiding effect, specifically, the flow guiding assembly comprises a first flow guiding pipe 2, the reaction gas inlet 9 is arranged at one end of the first flow guiding pipe 2 and used for introducing reaction gas in the working process, and the reaction gas inlet 9 is a symmetrical gas inlet. The wall of the first flow guide pipe 2 is provided with a plurality of first communication holes, generally, the symmetrical air inlets are arranged at the top of the first flow guide pipe 2, and the first communication holes are arranged at the lower part of the first flow guide pipe 2. The mixing chamber is formed in the pipe body of the first flow guide pipe 2, the mixing chamber is communicated with the air inlet chamber 1 through the first communicating hole, and waste gas introduced into the air inlet chamber 1 in the working process enters the mixing chamber through the first communicating hole and is fully mixed with reaction gas in the mixing chamber. Like this, owing to set up a plurality of first through-holes on the first honeycomb duct 2, when waste gas gets into the mixing chamber through first through-hole, then once the water conservancy diversion has been carried out, can be convenient for mix with the reaction gas in the mixing chamber more evenly.
A nozzle 10 may be installed at the reaction gas inlet 9, and the reaction gas may be sprayed into the mixing chamber in the form of mist through the nozzle 10 to further improve the uniformity of gas mixing. Taking urea as an example of a reaction gas, the mixer performs secondary collision crushing on urea spray particles in urea spray through a flushing type air inlet structure, so that the diameter of liquid drops is reduced, and the air inlet effect is improved.
Further, the diversion assembly further comprises a second diversion pipe 3, a plurality of second communication holes are formed in the second diversion pipe 3, and the second diversion pipe 3 is sleeved in the first diversion pipe 2. That is, the first draft tube 2 forms an outer draft tube, the second draft tube 3 forms an inner draft tube, and the lower portion of the inner draft tube is also perforated, i.e., the second communicating hole. In the working process, when gas sequentially passes through the first communicating hole and the second communicating hole, the gas can pass through double turbulence so as to further improve the flow guide effect.
This water conservancy diversion subassembly still includes water conservancy diversion baffle 4 and water conservancy diversion arc 5, water conservancy diversion baffle 4 install in the internal week of first honeycomb duct 2, just water conservancy diversion baffle 4 has and predetermines the tapering, water conservancy diversion arc 5 set up in the other end of first honeycomb duct 2. The diversion effect can be further improved by arranging the diversion baffle 4 and the diversion arc plate 5, and the diversion arc plate 5 is of a bowl-shaped structure and is one of main diversion parts. The surface area of the mixer is increased by the design of the double-layer flow guide pipe, the bowl-shaped flow guide arc plate 5 and the like, the decomposition efficiency of the urea aqueous solution is improved, and the crystallization risk of urea is reduced.
Furthermore, a first partition plate 6 and a second partition plate 7 which are connected with each other are further arranged in the air inlet cavity 1, the first partition plate 6 is located in front of the flow guide assembly along the air flow direction, and the second partition plate 7 is located behind the flow guide assembly along the air flow direction.
As shown in fig. 2, the rectifying plate 8 is a circular plate, the rectifying plate 8 includes a plate upper portion and a plate lower portion, and a ratio of an opening area of the rectifying through hole 801 in the plate upper portion to an opening area of the rectifying through hole 801 in the plate lower portion is 0.5 to 2.5. That is, the rectifying plate 8 of the mixer is a circular plate, and rectifying through holes 801 are formed in the circular plate, wherein the opening area of the upper semicircle is different from the opening area of the lower semicircle, and the uniformity of ammonia distribution is adjusted by adjusting the opening area ratio of the upper and lower semicircles. The rectifying plate 8 can further adjust the speed uniformity and the ammonia distribution uniformity of the air flow according to the disturbance of the flow guide assembly on the air flow.
Therefore, in the above embodiment, the mixer provided by the present invention performs secondary collision crushing on urea spray particles in urea spray through the opposite-flushing air inlet structure, so as to reduce the diameter of liquid drops; the surface area of the mixer is increased through the design of the double-layer flow guide pipe, the bowl-shaped flow guide arc plate 5 and the like, the decomposition efficiency of the urea aqueous solution is improved, and the risk of urea crystallization is reduced; the speed uniformity and the ammonia distribution uniformity of the air flow are adjusted through the rectifying plate 8, and the structures are matched with each other, so that the effects of improving the urea conversion efficiency and preventing urea crystallization are achieved, and the air flow speed uniformity and the ammonia distribution uniformity index of the SCR catalyst can be ensured to be above 0.95. Simulation experiments can also verify that the speed uniformity index and the ammonia distribution uniformity index of the SCR reach 0.973 and 0.957 respectively at the calibration working point.
Therefore, according to the utility model provides a mixer, it has set up cowling panel 8 in exhaust outlet 102 position, cowling panel 8 and water conservancy diversion subassembly cooperate and use, have avoided only setting up the air current bounce-back that curved guide plate caused, have improved the ammonia distribution uniformity of mixer gas outlet department for tail gas can be more for even distribution on the terminal surface of catalyst after the mixer, it is relatively poor to have solved among the prior art ammonia distribution uniformity in the mixer, lead to the lower problem of diesel engine nitrogen oxygen conversion efficiency.
A second aspect of the present invention provides an aftertreatment catalytic muffler, comprising a mixer as described above.
As shown in fig. 3, the aftertreatment catalytic muffler includes an air intake assembly 100, a DOC package unit 200, a DPF package unit 300, a mixer 400, an SCR package unit 500, an exhaust assembly 600, and other main components and connection relationships between the components, please refer to the prior art, which will not be described herein.
A third aspect of the present invention provides a diesel engine comprising an aftertreatment catalytic muffler as described above.
According to the utility model discloses aftertreatment catalytic muffler and diesel engine have the same advantage with above-mentioned blender, no longer describe herein.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A mixer, characterized in that it comprises:
an air intake chamber having an exhaust gas inlet and an exhaust gas outlet;
the guide assembly is arranged in the air inlet cavity, the guide assembly forms a mixing cavity, a reaction gas inlet is formed in the mixing cavity, the mixing cavity is communicated with the air inlet cavity, the guide assembly comprises a first guide pipe and a second guide pipe, the reaction gas inlet is formed in one end of the first guide pipe, a plurality of first communication holes are formed in the pipe wall of the first guide pipe, the mixing cavity is formed in the pipe body of the first guide pipe, the mixing cavity is communicated with the air inlet cavity through the first communication holes, a plurality of second communication holes are formed in the second guide pipe, and the second guide pipe is sleeved in the first guide pipe;
the cowling panel, the cowling panel install in exhaust outlet department, just a plurality of rectification through-holes have been seted up on the cowling panel.
2. The mixer of claim 1, wherein a nozzle is mounted at the reactant gas inlet.
3. The mixer of claim 1, wherein the flow directing assembly further comprises:
the diversion baffle is arranged on the inner periphery of the first diversion pipe and provided with a preset taper.
4. The mixer of claim 3, wherein the flow directing assembly further comprises:
and the flow guide arc plate is arranged at the other end of the first flow guide pipe.
5. The mixer of claim 1, wherein the inlet chamber further comprises a first baffle plate and a second baffle plate connected to each other, the first baffle plate being located before the flow guide assembly in the direction of airflow, and the second baffle plate being located after the flow guide assembly in the direction of airflow.
6. The mixer of claim 1, wherein the fairing plate is a circular plate comprising a plate body upper portion and a plate body lower portion;
the ratio of the opening area of the rectifying through hole at the upper part of the plate body to the opening area of the rectifying through hole at the lower part of the plate body is 0.5-2.5.
7. An aftertreatment catalytic muffler comprising a mixer according to any one of claims 1 to 6.
8. A diesel engine comprising the aftertreatment catalytic muffler of claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122826105.0U CN217107165U (en) | 2021-11-17 | 2021-11-17 | Mixer, aftertreatment catalytic muffler and diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122826105.0U CN217107165U (en) | 2021-11-17 | 2021-11-17 | Mixer, aftertreatment catalytic muffler and diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217107165U true CN217107165U (en) | 2022-08-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122826105.0U Active CN217107165U (en) | 2021-11-17 | 2021-11-17 | Mixer, aftertreatment catalytic muffler and diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217107165U (en) |
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2021
- 2021-11-17 CN CN202122826105.0U patent/CN217107165U/en active Active
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