CN220505150U - Cyclone mixer and tail gas aftertreatment device - Google Patents
Cyclone mixer and tail gas aftertreatment device Download PDFInfo
- Publication number
- CN220505150U CN220505150U CN202322004497.1U CN202322004497U CN220505150U CN 220505150 U CN220505150 U CN 220505150U CN 202322004497 U CN202322004497 U CN 202322004497U CN 220505150 U CN220505150 U CN 220505150U
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- Prior art keywords
- mixing pipeline
- cyclone
- urea
- baffle
- mixer
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- 238000002156 mixing Methods 0.000 claims abstract description 73
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000004202 carbamide Substances 0.000 claims abstract description 66
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 9
- 238000000889 atomisation Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model provides a cyclone mixer and a tail gas aftertreatment device, which can ensure the urea mixing effect, and simultaneously have a relatively simple cyclone structure and reduced manufacturing cost, and the cyclone mixer comprises a baffle plate arranged in a mixer cylinder, wherein the baffle plate seals the interior of the mixer cylinder, a urea nozzle mounting seat is arranged on the mixer cylinder and in front of the baffle plate, and a urea injection device is arranged on the urea nozzle mounting seat, and is characterized in that: the baffle is close to the one end of urea nozzle mount pad is equipped with the reducing water conservancy diversion mouth, mixing pipeline is connected to the lower extreme of urea nozzle mount pad, the reducing water conservancy diversion mouth pass through the direction swirl room with mixing pipeline is linked together, still be equipped with the broken baffle of urea in the mixing pipeline, mixing pipeline's lower extreme is equipped with the air current export, the air current export orientation baffle one side is seted up.
Description
Technical Field
The utility model relates to the technical field of tail gas aftertreatment devices, in particular to a cyclone mixer and a tail gas aftertreatment device.
Background
The mixer is a key part for mixing urea and exhaust gas, and relates to whether a rear Selective Catalytic Reduction (SCR) device can effectively react to reduce NOx in the exhaust gas into N2 and H2O.
With the increasingly stricter emission regulations, the requirements on the effect of urea mixing are also increasingly higher, the Chinese patent with publication No. CN212898682U discloses a novel post-treatment mixer connecting device, the Chinese patent with publication No. CN114263518A also discloses a dispersed crushing and arc plate diversion type urea mixer, and the Chinese patent with publication No. CN111237036A discloses a diversion rotary urea mixing device, wherein a cyclone tube structure is adopted, the mixing effect is improved, but the adopted cyclone tube structure is difficult to manufacture, the processing is complicated, the cost is high, and in addition, the mixer with the cyclone tube has the following problems: when the air flow enters from the longitudinal fins on the swirl tube, a large back pressure is created.
Disclosure of Invention
In order to solve the problems, the utility model provides the cyclone mixer and the tail gas aftertreatment device, which can ensure the urea mixing effect, simultaneously have smaller back pressure, have a relatively simple cyclone structure and reduce the manufacturing cost.
The technical scheme is as follows: the utility model provides a cyclone mixer, includes the baffle that sets up in the blender barrel, the baffle will the blender barrel is inside to be sealed, just is located on the blender barrel the place ahead of baffle is provided with urea nozzle mount pad, and urea injection apparatus installs on the urea nozzle mount pad, its characterized in that: the baffle is close to the one end of urea nozzle mount pad is equipped with the reducing water conservancy diversion mouth, mixing pipeline is connected to the lower extreme of urea nozzle mount pad, the reducing water conservancy diversion mouth pass through the direction swirl room with mixing pipeline is linked together, still be equipped with the broken baffle of urea in the mixing pipeline, mixing pipeline's lower extreme is equipped with the air current export, the air current export orientation baffle one side is seted up.
Further, the guiding swirl chamber comprises an arc-shaped channel, one end of the arc-shaped channel is connected with the reducing diversion port, and the other end of the arc-shaped channel is communicated with the inside of the mixing pipeline.
Further, the arc-shaped channel comprises a mixing pipeline outer wall and an injection guiding inner pipe, wherein the mixing pipeline outer wall is arranged at intervals, the injection guiding inner pipe is positioned at the inner side of the mixing pipeline outer wall, the mixing pipeline outer wall is matched with an upper sealing plate, a lower sealing plate and a side sealing plate of the injection guiding inner pipe to form the arc-shaped channel, and an opening is formed in the injection guiding inner pipe to enable the arc-shaped channel to be communicated with the inside of the mixing pipeline.
Further, the baffle plate protrudes towards the side far away from the mixing pipeline to form a convex hull.
Further, an air flow reflecting plate is arranged at the air flow outlet position of the mixing pipeline, and the air flow reflecting plate is inclined towards the baffle plate.
Further, the urea crushing baffle plates are arranged in the mixing pipeline at intervals, and the urea crushing baffle plates are arranged at the upper end of the airflow outlet.
Further, the urea crushing baffle comprises an upper plane part, an inclined plane part and a lower plane part which are connected, wherein a plurality of airflow through holes are respectively arranged on the upper plane part, the inclined plane part and the lower plane part.
Further, the inclined surface portion of the urea crushing baffle plate located at the lowermost end of the mixing pipe is inclined toward one side of the baffle plate.
Further, a cyclone separator is arranged in the mixer barrel and positioned at the rear side of the mixing pipeline, the cyclone separator is provided with a cyclone convex hull protruding towards the direction away from the mixing pipeline, and a cyclone air outlet arranged around the center of the cyclone separator is arranged on the cyclone separator.
The utility model provides a tail gas aftertreatment device which characterized in that: the cyclone mixer comprises the cyclone mixer, and the cyclone mixer is positioned between the DPF unit and the SCR unit.
The cyclone mixer adopts a cyclone structure with simpler structure, the arc-shaped channel is constructed to generate cyclone, the urea crushing plate in the mixing pipeline is matched, tail gas enters from the reducing guide port, the size of the reducing guide port is reduced to accelerate airflow, the airflow is guided to form cyclone through the guiding cyclone chamber, the cyclone is mixed with urea sprayed from the urea spraying device at the upper end of the mixing pipeline, the urea and the airflow are mixed and then collide with the urea crushing plate, the mixing pipeline has good urea atomization mixing effect, compared with the existing structure, the cost of the cyclone structure is reduced, and the cyclone structure for mixing urea and tail gas has the advantage of small back pressure; and the direction of the air outlet of the mixing pipeline is optimized, so that the urea mixed air flow collides with the air flow reflecting plate and the baffle plate again, good atomization effect is generated, and urea is not easy to crystallize; in addition, the rear side of mixing tube is provided with the whirl baffle, and the whirl baffle has whirl convex closure cooperation whirl gas outlet, more can make the airflow homogeneity coefficient better to can shorten the distance with the SCR carrier.
Drawings
FIG. 1 is a top view of a cyclone mixer in an embodiment;
FIG. 2 is a cross-sectional view taken along the direction A-A of FIG. 1;
FIG. 3 is a left side view of the cyclone mixer in an embodiment;
FIG. 4 is a schematic view showing the internal structure of a mixer barrel in the cyclone mixer according to the embodiment;
FIG. 5 is a schematic diagram of the cyclone mixer of the embodiment after separating the mixing tubes;
fig. 6 is a schematic view of a pilot swirl chamber of a swirl mixer in an embodiment.
Detailed Description
As described in the background art, with implementation of the national sixth B regulations, control of tail gas of diesel vehicles is more strict, and since the existing diesel vehicle aftertreatment mostly adopts a mixer with a cyclone tube structure, the cyclone tube structure is difficult to manufacture, complicated to process and high in cost.
In order to design a mixer which is easier to manufacture, lower in production cost and good in urea mixing effect, as shown in fig. 1-6, the utility model provides a cyclone mixer, which comprises a baffle plate 2 arranged in a mixer barrel 1, wherein the baffle plate 2 seals the interior of the mixer barrel 1, a urea nozzle mounting seat 3 is arranged on the mixer barrel 1 and positioned in front of the baffle plate 2, a urea injection device is arranged on the urea nozzle mounting seat 3, one end of the baffle plate 2, which is close to the urea nozzle mounting seat 3, is provided with a reducing diversion port 4, the lower end of the urea nozzle mounting seat 3 is connected with a mixing pipeline 5, the reducing diversion port 4 is communicated with the mixing pipeline 5 through a guiding cyclone chamber 6, a urea crushing baffle 7 is further arranged in the mixing pipeline 5, the lower end of the mixing pipeline 5 is provided with an airflow outlet 8, and the airflow outlet 8 is arranged towards one side of the baffle plate.
In one embodiment, the guide swirl chamber 6 includes an arc-shaped passage 610, one end of the arc-shaped passage 610 is connected to the variable-diameter flow guide port 4, and the other end of the arc-shaped passage 610 is communicated with the inside of the mixing pipe 5.
In one embodiment, the arc-shaped channel 610 comprises a mixing pipe outer wall and a jet guiding inner pipe 611 which are arranged at intervals and are positioned on the inner side of the mixing pipe outer wall, the mixing pipe outer wall and the jet guiding inner pipe 611 are matched to form the arc-shaped channel 610, an upper sealing plate 612, a lower sealing plate 613 and a side sealing plate 614, and an opening 615 is formed on the jet guiding inner pipe 611 so that the arc-shaped channel 610 is communicated with the interior of the mixing pipe 5.
When the current air flows in the mixer cylinder, the baffle plate can only accelerate the current air to flow into the guiding cyclone chamber 6 from the reducing guide port 4, the air flows rotate in the arc-shaped channel 610 of the guiding cyclone chamber 6 to form rotational flow, the rotational flow enters the mixing pipeline 5 and is mixed with urea sprayed into the mixing pipeline 5 to form rotational flow,
in one embodiment, an air flow reflecting plate 10 is arranged at the air flow outlet position of the mixing pipeline, the air flow reflecting plate 10 is inclined towards the baffle plate 2, the baffle plate 2 protrudes towards the side far away from the mixing pipeline to form a convex hull 201, and when the air flow in the mixing pipeline 5 flows out, the air flow impinges on the convex hull 201 to generate good atomization effect.
In one embodiment, two urea crushing baffles 7 are arranged at intervals in the mixing pipeline 5, the urea crushing baffles 7 are arranged at the upper end of the airflow outlet 8, in other embodiments, other numbers of urea crushing baffles 7 can be arranged, the urea crushing baffles 7 comprise an upper plane part 701, a bevel part 702 and a lower plane part 703 which are connected, and a plurality of airflow through holes 704 are respectively arranged on the plane part 701, the bevel part 702 and the lower plane part 703.
In the embodiment, the inclined surface part 702 of the urea crushing baffle 7 at the lowest end of the mixing pipeline 5 is inclined towards one side of the baffle 2, the air flow passes through the lower urea crushing baffle 7, the air flow forms 2 directions, and part of the air flow is vertically downward, and the other part of the air flow is laterally directed to the air flow outlet 8; a part of the vertical downward airflow finally collides with the airflow reflecting plate 10 and flows out from the airflow outlet 8, a part of the airflow impacted by the wall surface of the lateral mixing pipeline directly flows out from the airflow outlet 8, and the two parts of the airflow impact to further atomize urea particles.
In one embodiment, a cyclone separator 9 is arranged in the mixer barrel and positioned at the rear side of the mixing pipeline, the cyclone separator 9 is provided with a cyclone convex hull 901 protruding towards the direction away from the mixing pipeline, the cyclone separator 9 is provided with a cyclone air outlet 902 arranged around the center of the cyclone separator, and compared with a common cyclone separator, the cyclone separator can better enable the uniformity coefficient of air flow and shorten the distance between the cyclone separator and an SCR carrier.
In an embodiment of the present utility model, there is also provided an exhaust gas aftertreatment device, including the cyclone mixer in the above embodiment, where the cyclone mixer is located between the DPF unit and the SCR unit.
The prior art mixer with swirl tube, as shown in the background art, the Chinese patent publication No. CN212898682U discloses a novel post-treatment mixer connecting device, as well as the Chinese patent publication No. CN114263518A discloses a dispersing crushing and arc plate diversion type urea mixer, and as disclosed in the Chinese patent publication No. CN111237036A, a diversion rotary urea mixing device which adopts a mixing tube structure for generating swirl, is a mixing tube structure in which a circular tube is cut into a certain number of blades, then fins are turned over to form a certain angle, when air is introduced, air flows from all around the blades, and swirl is formed in the tube, and the swirl tube has the following problems: when the air flow enters from the longitudinal fins, larger back pressure is generated, so that the power of an engine is reduced, the manufacturing is difficult, the angles of the fins are difficult to control during forming, rebound exists, and the like, and once the angles of the fins are not well controlled, the formed rotational flow effect is reduced, so that urea is easy to crystallize;
the cyclone mixer in the embodiment enables the tail gas of the diesel vehicle to generate cyclone in the mixer cylinder; the device is characterized in that smaller back pressure can be generated, and larger rotational flow eccentricity is generated; urea is more evenly mixed with the tail gas; not easy to crystallize;
the mixer is provided with a single pore channel of the variable-diameter diversion port for entering, so that the size of the variable-diameter diversion port is only reasonably set, the influence on the airflow is small, and when the airflow enters, a swirl is formed in the guiding swirl chamber along the inner and outer pipes; the urea spray nozzle is characterized in that the urea spray nozzle is externally swirled, then enters the spray guiding inner pipe from the opening of the inner pipe, forms internal swirled flow in the spray guiding inner pipe, is mixed with urea for swirling flow, has less back pressure loss, is more complete in urea atomization and has simple manufacturing process; the structure of the common cyclone tube can be replaced; the common cyclone tube is difficult to manufacture, complicated to process and high in cost, and the cyclone tube with the structure is simple in structure, low in manufacturing cost and novel in structure; the urea and the automobile exhaust can be fully mixed and atomized, crystallization is not easy, the rear convex hull cyclone separator generates smaller back pressure than a flat separator, the cyclone uniformity coefficient is better, the distance between the urea and the SCR carrier can be shortened, and the space is effectively saved.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (10)
1. The utility model provides a cyclone mixer, includes the baffle that sets up in the blender barrel, the baffle will the blender barrel is inside to be sealed, just is located on the blender barrel the place ahead of baffle is provided with urea nozzle mount pad, and urea injection apparatus installs on the urea nozzle mount pad, its characterized in that: the baffle is close to the one end of urea nozzle mount pad is equipped with the reducing water conservancy diversion mouth, mixing pipeline is connected to the lower extreme of urea nozzle mount pad, the reducing water conservancy diversion mouth pass through the direction swirl room with mixing pipeline is linked together, still be equipped with the broken baffle of urea in the mixing pipeline, mixing pipeline's lower extreme is equipped with the air current export, the air current export orientation baffle one side is seted up.
2. A cyclone mixer as claimed in claim 1, wherein: the guiding swirl chamber comprises an arc-shaped channel, one end of the arc-shaped channel is connected with the reducing diversion port, and the other end of the arc-shaped channel is communicated with the inside of the mixing pipeline.
3. A cyclone mixer as claimed in claim 2, wherein: the arc-shaped channel comprises a mixing pipeline outer wall and an injection guiding inner pipe, wherein the mixing pipeline outer wall is arranged at intervals, the injection guiding inner pipe is positioned on the inner side of the mixing pipeline outer wall, the mixing pipeline outer wall is matched with an upper sealing plate, a lower sealing plate and a side sealing plate of the injection guiding inner pipe to form the arc-shaped channel, and an opening is formed in the injection guiding inner pipe to enable the arc-shaped channel to be communicated with the inside of the mixing pipeline.
4. A cyclone mixer as claimed in claim 1, wherein: the baffle is convex towards one side far away from the mixing pipeline to form a convex hull.
5. A cyclone mixer as claimed in claim 1, wherein: an air flow reflecting plate is arranged at the air flow outlet position of the mixing pipeline and is inclined towards the baffle plate.
6. A cyclone mixer as claimed in claim 1, wherein: the urea crushing baffle plates are arranged in the mixing pipeline at intervals, and the urea crushing baffle plates are arranged at the upper end of the airflow outlet.
7. A cyclone mixer as claimed in claim 1, wherein: the urea crushing baffle comprises an upper plane part, an inclined plane part and a lower plane part which are connected, wherein a plurality of airflow through holes are respectively arranged on the upper plane part, the inclined plane part and the lower plane part.
8. A cyclone mixer as claimed in claim 7, wherein: the inclined surface part of the urea crushing baffle plate positioned at the lowest end of the mixing pipeline is inclined towards one side of the baffle plate.
9. A cyclone mixer as claimed in claim 1, wherein: the cyclone separator is arranged in the mixer cylinder and positioned at the rear side of the mixing pipeline, the cyclone separator is provided with a cyclone convex hull protruding towards the direction away from the mixing pipeline, and a cyclone air outlet arranged around the center of the cyclone separator is arranged on the cyclone separator.
10. The utility model provides a tail gas aftertreatment device which characterized in that: a cyclone mixer comprising the method of claim 1, said cyclone mixer being located between the DPF unit and the SCR unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322004497.1U CN220505150U (en) | 2023-07-28 | 2023-07-28 | Cyclone mixer and tail gas aftertreatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322004497.1U CN220505150U (en) | 2023-07-28 | 2023-07-28 | Cyclone mixer and tail gas aftertreatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220505150U true CN220505150U (en) | 2024-02-20 |
Family
ID=89871089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322004497.1U Active CN220505150U (en) | 2023-07-28 | 2023-07-28 | Cyclone mixer and tail gas aftertreatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220505150U (en) |
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2023
- 2023-07-28 CN CN202322004497.1U patent/CN220505150U/en active Active
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