CN220185207U - Rotational flow opposite flushing type mixer for post-treatment - Google Patents
Rotational flow opposite flushing type mixer for post-treatment Download PDFInfo
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- CN220185207U CN220185207U CN202321685251.9U CN202321685251U CN220185207U CN 220185207 U CN220185207 U CN 220185207U CN 202321685251 U CN202321685251 U CN 202321685251U CN 220185207 U CN220185207 U CN 220185207U
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- cyclone
- porous
- tube
- pipe
- baffle plate
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- 238000011010 flushing procedure Methods 0.000 title description 2
- 238000003466 welding Methods 0.000 claims description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 23
- 239000004202 carbamide Substances 0.000 abstract description 23
- 238000002156 mixing Methods 0.000 abstract description 13
- 239000007789 gas Substances 0.000 description 29
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 210000002268 wool Anatomy 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
The utility model discloses a cyclone opposite-impact type post-treatment mixer, which comprises an outer pipe and a mixer assembly, wherein the mixer assembly is arranged in the outer pipe and comprises a cyclone porous pipe, a baffle plate, an outer porous pipe and a bowl-shaped structure; the baffle plate is arranged on the cyclone porous pipe and divides the cyclone porous pipe into an upper part and a lower part, the upper part of the cyclone porous pipe is provided with a round hole, the lower part of the cyclone porous pipe is provided with a first cyclone fin and a second cyclone fin, and the directions of the first cyclone fin and the second cyclone fin are opposite; the outer porous pipe is sleeved at the lower part of the cyclone porous pipe, and the bowl-shaped structure is arranged at the bottom of the cyclone porous pipe; according to the utility model, the first cyclone fins and the second cyclone fins with opposite directions are arranged on the cyclone porous plate, so that gas entering the cyclone porous plate forms cyclone opposite impact, and the gas flows collide with urea after cyclone, so that the uniformity of urea mixing is improved.
Description
Technical Field
The utility model belongs to the technical field of engine tail gas treatment, and particularly relates to a cyclone opposite-impact type post-treatment mixer.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The exhaust gases of motor vehicles are generally treated by SCR technology, in particular by spraying an aqueous urea solution, by evaporation and pyrolysis to produce ammonia, which reduces NOx to N in a catalyst 2 . The uniformity of ammonia distribution at the inlet section of the catalyst has an important influence on the conversion rate of NOx, and at present, the existing mixer is applied to an engine exhaust aftertreatment system, so that the problems of high air flow pressure loss, poor mixing uniformity of mixed urea aqueous solution and exhaust gas, serious crystallization of the urea aqueous solution and uneven ammonia distribution exist.
The common SCR air inlet mixing structure in the prior art is shown in figures 1-5 and comprises an outer layer pipe 11, a cyclone pipe 12, steel wool 13 and a cyclone pipe partition 14; the air current can follow the whirl direction whirl after urea and waste gas mix, gets into SCR through the steel wool, and current blender structure mainly has following shortcoming: (1) The waste gas flow enters the cyclone tube, the urea and the waste gas flow are mixed and then enter the steel wool, the mixing time is short, the back pressure is high, and the problem of urea crystallization is serious. (2) Steel wool parts are poor in uniformity and uniformity, and the whole structure is opposite to NH 3 The mixing was not uniform.
Disclosure of Invention
The utility model aims to provide a cyclone opposite-impact type post-treatment mixer, which ensures that airflow is impacted with urea after cyclone through a cyclone opposite-impact type structure, and improves the uniformity of urea mixing.
In order to achieve the above object, the present utility model is realized by the following technical scheme:
in a first aspect, embodiments of the present utility model provide a cyclone hedging post-treatment mixer comprising an outer tube and a mixer assembly disposed within the outer tube, the mixer assembly comprising a cyclone perforated tube, a baffle, an outer perforated tube, and a bowl-like structure;
the baffle plate is arranged on the cyclone porous pipe and divides the cyclone porous pipe into an upper part and a lower part, the upper part of the cyclone porous pipe is provided with a round hole, the lower part of the cyclone porous pipe is provided with a first cyclone fin and a second cyclone fin, and the directions of the first cyclone fin and the second cyclone fin are opposite; the outer porous pipe is sleeved at the lower part of the cyclone porous pipe, and the bowl-shaped structure is arranged at the bottom of the cyclone porous pipe.
As a further technical scheme, one end of the outer tube is a gas inlet, and the other end of the outer tube is a gas outlet.
As a further technical scheme, the baffle includes first arc baffle, rectangle baffle and second arc baffle, forms Z style of calligraphy structure, first arc baffle is close to the gas inlet department of outer tube and is located the upper portion space of outer tube, the second arc baffle is close to the gas outlet department of outer tube and is located the lower part space of outer tube.
As a further technical scheme, a plurality of round holes are formed in the side wall surface, close to the first arc-shaped baffle, of the cyclone porous pipe.
As a further technical scheme, a plurality of diversion holes are formed in the side wall surface, far away from the second arc-shaped baffle, of the outer perforated pipe.
As a further technical scheme, a mounting hole is formed in the center of the rectangular baffle plate, and the diameter of the mounting hole is matched with the outer diameter of the cyclone perforated pipe.
As a further technical scheme, the axis of the outer tube is perpendicular to the axis of the cyclone porous tube.
As a further technical solution, the mixer assembly further comprises a spoiler disposed at the gas outlet close to the outer tube.
As a further technical scheme, the spoiler is bent and arranged, and a plurality of uniformly arranged flow disturbing holes are formed in the spoiler.
As a further technical scheme, the outer pipe, the cyclone porous pipe, the baffle, the outer porous pipe and the bowl-shaped structure are all connected in a welding mode.
The beneficial effects of the embodiment of the utility model are as follows:
according to the cyclone opposite-impact type post-treatment mixer provided by the utility model, the first cyclone fins and the second cyclone fins which are opposite in direction are arranged on the cyclone porous plate, so that the gas entering the cyclone porous plate forms cyclone opposite-impact, and the gas flows collide with urea after cyclone, so that the uniformity of urea mixing is improved; in addition, the swirl porous pipes with opposite fin directions can enable the air flow to form two opposite rotating air flows, so that the turbulence effect is improved, and the uniformity of the air is facilitated.
According to the cyclone opposite-impact type post-treatment mixer provided by the utility model, the baffle is arranged into the Z-shaped plate, the upper half part of the baffle blocks the airflow, so that the airflow is forced to collide with urea from the lower part upwards, and the mixing effect of urea is improved; the upper half part of the cyclone hole pipe is in a half-open hole structure, so that airflow is forced to wind the half circumference of the porous pipe, and the flow speed of the airflow and the gas mixing path are effectively increased.
The cyclone opposite-impact type post-treatment mixer provided by the utility model adopts a universal design, and each design structure can be adjusted according to actual conditions and applied to various machine types; and moreover, the workability is strong, the process is good, and each component is connected in a welding mode, so that the mechanical strength can be ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
FIG. 1 is a schematic view of the overall structure of a mixer of the prior art;
FIG. 2 is a schematic view of the structure of an outer tube in a conventional mixer;
FIG. 3 is a schematic view of the structure of a swirl tube in a conventional mixer;
FIG. 4 is a schematic view of the structure of steel wool in a prior art mixer;
FIG. 5 is a schematic view of the structure of a swirl tube baffle in a prior art mixer;
FIG. 6 is a schematic view showing the overall structure of a cyclone-hedging type post-treatment mixer according to the present utility model;
FIG. 7 is a schematic view showing the internal structure of a cyclone-hedging type post-treatment mixer according to the present utility model;
FIG. 8 is a schematic view of the structure of the outer tube in the mixer of the present utility model;
FIG. 9 is a schematic view of the structure of a swirl perforated tube in a mixer of the present utility model;
FIG. 10 is a schematic view of the structure of a baffle in the mixer of the present utility model;
FIG. 11 is a schematic view of the structure of the outer perforated tube in the mixer of the present utility model;
FIG. 12 is a schematic view of a bowl configuration in a mixer of the present utility model;
fig. 13 is a schematic view of the structure of a spoiler in the mixer of the present utility model.
The schematic is used only as schematic;
wherein, 1, the outer tube; 101. a gas inlet; 102. a gas outlet; 103. a urea injection port; 2. a swirl porous tube; 201. a first round hole; 202. a first swirl fin; 203. a second swirl fin; 204. a second round hole; 205. a groove; 3. a baffle; 301. a first arcuate baffle; 302. a rectangular baffle; 303. a circular mounting hole; 304. a second arcuate baffle; 4. an outer perforated tube; 401. a deflector aperture; 5. a bowl-like structure; 6. a spoiler; 601. a disturbance orifice; 11. an outer layer tube; 12. swirl tube; 13. steel wool; 14. cyclone tube separator.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
Example 1
In an exemplary embodiment of the present utility model, as shown in fig. 6 and 7, there is provided a mixer for cyclone opposite-impact type post-treatment, comprising an outer tube 1 and a mixer assembly, wherein the mixer assembly is disposed in the outer tube 1, the mixer assembly comprises a cyclone porous tube 2, a baffle 3, an outer porous tube 4 and a bowl-shaped structure 5, the baffle 3 is mounted on the cyclone porous tube 2 to divide the cyclone porous tube into an upper part and a lower part, a round hole is disposed at the upper part of the cyclone porous tube, a first cyclone fin and a second cyclone fin are disposed at the lower part, and the directions of the first cyclone fin and the second cyclone fin are opposite; the outer porous pipe 4 is sleeved at the lower part of the cyclone porous pipe 2, and the bowl-shaped structure 5 is arranged at the bottom of the cyclone porous pipe 4.
As shown in fig. 8, the outer tube 1 has a cylindrical structure, and is transversely arranged when in use, one end of the outer tube 1 is provided with a gas inlet 101, the other end is provided with a gas outlet 102, a urea injection inlet 103 is further arranged on the tube body of the outer tube, and the urea injection inlet is communicated with a mixer assembly in the outer tube to realize mixing of urea and tail gas.
As shown in fig. 7 and 9, the cyclone porous tube 2 is a circular tube, the cyclone porous tube 2 is installed in the outer tube 1, so that the axis of the outer tube 1 is perpendicular to the axis of the cyclone porous tube 2, the baffle 3 is installed on the cyclone porous tube 2 to divide the cyclone porous tube 2 into an upper part and a lower part, the upper part of the cyclone porous tube 2 is provided with a first circular hole 201, the lower part is provided with a first cyclone fin 202 and a second cyclone fin 203, and the directions of the first cyclone fin 202 and the second cyclone fin 203 are opposite, so that the gas passing through the cyclone fins of the cyclone porous tube can form two cyclone flows with opposite directions; the second round holes 204 and grooves 205 are also arranged below the second cyclone fins 203 of the cyclone porous tube, so that the formation of air flow dead zones and crystallization accumulation at the bottom of the cyclone porous tube is avoided.
As shown in fig. 10, the baffle 3 includes a first arc baffle 301, a rectangular baffle 302, and a second arc baffle 304, and the first arc baffle 301, the rectangular baffle 302, and the second arc baffle 304 form a zigzag structure. Referring to fig. 6, the first arc baffle is close to the gas inlet of the outer tube 1 and is located in the upper space of the outer tube, the second arc plate is close to the gas outlet of the outer tube and is located in the lower space of the outer tube, the first arc baffle of the Z-shaped baffle blocks the air flow, so that the air flow is forced to collide with urea from the lower part upwards, and the mixing effect of urea is improved. The center position of the rectangular baffle plate 302 is provided with a circular mounting hole 303, the diameter of the circular mounting hole 303 is matched with the outer diameter of the cyclone perforated pipe, and the cyclone perforated pipe is fixed.
Further, the first round hole at the upper part of the cyclone porous pipe is arranged on the side wall surface of the cyclone porous pipe close to the first arc-shaped plate, so that the half pipe close to the baffle is fully perforated, the half pipe far away from the baffle is not perforated, the air flow is forced to strike the baffle, then the pipe is wound for half circumference, the mixing path of the air flow and urea is increased, and the flow speed of the air flow is increased.
The lower part of the cyclone porous tube, namely the positions of the first cyclone fin and the second cyclone fin, is sleeved with an outer porous tube 4, as shown in fig. 11, a plurality of diversion holes 401 are formed on the side wall surface of the outer porous tube, which is far away from the second arc plate, so that gas entering the outer tube enters the cyclone porous tube 2 through the diversion holes 401 on the outer porous tube.
The bottom of the cyclone porous pipe is provided with a bowl-shaped structure 5, and the bowl-shaped structure is shown in figure 12, so that the tail gas can only enter the cyclone porous pipe through the outer porous pipe, and the cyclone is formed in the cyclone porous pipe.
The mixer assembly further comprises a spoiler 6, the spoiler 6 is arranged at the gas outlet close to the outer tube, as shown in fig. 13, the spoiler is bent and arranged, and a plurality of uniformly arranged flow disturbing holes are formed in the spoiler, so that the mixed gas passes through the spoiler provided with the flow disturbing holes, and the gas flow is uniformly dispersed on the end face of the SCR carrier.
In this embodiment, the outer tube, the swirl perforated tube, the baffle, the outer perforated tube and the bowl-shaped structure are all connected by welding to ensure sufficient mechanical strength.
The working principle of the cyclone opposite-impact type post-treatment mixer provided by the embodiment is as follows:
after the tail gas enters the outer pipe, under the blocking of the first arc-shaped baffle plate, the tail gas can only enter the cyclone porous pipe through the diversion holes on the outer porous pipe at the lower part, and as the cyclone porous pipe is provided with the first cyclone fins and the second cyclone fins with opposite directions, gas passing through the cyclone fins of the cyclone porous pipe can form two cyclone flows with opposite directions, the cyclone flow at the lower part pushes the cyclone flow at the upper part to collide with the injected urea, and the bottom of the cyclone porous pipe is grooved, so that the formation of a dead zone of airflow and the accumulation of crystals are avoided.
In addition, the upper half part of the cyclone porous pipe is a semi-perforated circular pipe: the half pipe close to the baffle is fully perforated, and the half pipe far away from the baffle is not perforated so as to force the airflow to strike the baffle and then wind the pipe half circle, increase the mixing path of the airflow and urea and increase the flow velocity of the airflow.
The mixed gas passes through the perforated spoiler, so that the gas flow is uniformly dispersed on the end face of the SCR carrier.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The cyclone opposite-impact type post-treatment mixer is characterized by comprising an outer tube and a mixer assembly, wherein the mixer assembly is arranged in the outer tube and comprises a cyclone porous tube, a baffle plate, an outer porous tube and a bowl-shaped structure;
the baffle plate is arranged on the cyclone porous pipe and divides the cyclone porous pipe into an upper part and a lower part, the upper part of the cyclone porous pipe is provided with a round hole, the lower part of the cyclone porous pipe is provided with a first cyclone fin and a second cyclone fin, and the directions of the first cyclone fin and the second cyclone fin are opposite; the outer porous pipe is sleeved at the lower part of the cyclone porous pipe, and the bowl-shaped structure is arranged at the bottom of the cyclone porous pipe.
2. The cyclone-hedging type post-treatment mixer according to claim 1, wherein one end of the outer tube is a gas inlet, and the other end is a gas outlet.
3. The cyclone-hedging type post-treatment mixer according to claim 2, wherein the baffle plate comprises a first arc baffle plate, a rectangular baffle plate and a second arc baffle plate, the first arc baffle plate is adjacent to the gas inlet of the outer tube and is positioned in the upper space of the outer tube, and the second arc baffle plate is adjacent to the gas outlet of the outer tube and is positioned in the lower space of the outer tube.
4. The cyclone counter-flow type post-treatment mixer according to claim 3, wherein the side wall surface of the cyclone porous pipe, which is close to the first arc-shaped baffle plate, is provided with a plurality of round holes.
5. The cyclone-hedging type post-treatment mixer according to claim 3, wherein a plurality of diversion holes are formed on a side wall surface of the outer perforated pipe, which is far from the second arc-shaped baffle plate.
6. The cyclone-hedging type post-treatment mixer according to claim 3, wherein a mounting hole is provided at the center of the rectangular baffle plate, and the diameter of the mounting hole is adapted to the outer diameter of the cyclone perforated pipe.
7. The cyclone counter-flow type aftertreatment mixer according to claim 1 wherein the axis of the outer tube is perpendicular to the axis of the cyclone perforated tube.
8. The swirl-hedging aftertreatment mixer of claim 1 wherein the mixer assembly further comprises a spoiler disposed proximate the gas outlet of the outer tube.
9. The cyclone-hedging type post-treatment mixer according to claim 8, wherein the spoiler is arranged in a bent manner, and a plurality of uniformly arranged turbulence holes are formed in the spoiler.
10. The cyclone-hedging type post-treatment mixer according to claim 1, wherein the outer tube, the cyclone perforated tube, the baffle, the outer perforated tube and the bowl-shaped structure are all connected by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321685251.9U CN220185207U (en) | 2023-06-29 | 2023-06-29 | Rotational flow opposite flushing type mixer for post-treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321685251.9U CN220185207U (en) | 2023-06-29 | 2023-06-29 | Rotational flow opposite flushing type mixer for post-treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220185207U true CN220185207U (en) | 2023-12-15 |
Family
ID=89107940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321685251.9U Active CN220185207U (en) | 2023-06-29 | 2023-06-29 | Rotational flow opposite flushing type mixer for post-treatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220185207U (en) |
-
2023
- 2023-06-29 CN CN202321685251.9U patent/CN220185207U/en active Active
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