CN214787629U - Efficient SCR mixer - Google Patents
Efficient SCR mixer Download PDFInfo
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- CN214787629U CN214787629U CN202121211520.9U CN202121211520U CN214787629U CN 214787629 U CN214787629 U CN 214787629U CN 202121211520 U CN202121211520 U CN 202121211520U CN 214787629 U CN214787629 U CN 214787629U
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Abstract
The utility model discloses a high-efficient blender of SCR belongs to power machinery technical field, and it is inhomogeneous to have solved the blender airflow velocity of flow, and urea distribution area is little, is unfavorable for the problem of urea evaporation. The mixer comprises a barrel, wherein a flow guide device which is divided into a left cavity and a right cavity is arranged in the barrel, a rotational flow mixing pipe is arranged on the flow guide device, the rotational flow mixing pipe is positioned in the left cavity at the top of the flow guide device, a nozzle seat used for installing a nozzle is arranged above the barrel, the nozzle seat is communicated with the rotational flow mixing pipe, an inner stainless steel wire mesh is arranged in the flow guide device, an outer stainless steel wire mesh is sleeved at the lower end of the flow guide device, and the left cavity, the rotational flow mixing pipe, the flow guide device and the right cavity are sequentially communicated. The utility model discloses a be applied to blender in tail gas aftertreatment makes reductant and engine exhaust intensive mixing even, has splendid urea mixing evaporation effect, is difficult for the crystallization under reasonable urea injection quantity.
Description
Technical Field
The utility model relates to a power machinery technical field especially relates to a high-efficient blender of SCR.
Background
Selective Catalytic Reduction (SCR) refers to Selective Reduction of NOx in exhaust gas to non-toxic N by reducing agents (ammonia, urea, hydrocarbons, etc.) under a certain temperature range and catalyst action2And H2And O, thereby achieving the purpose of reducing the NOx emission of the engine. During the operation of the system, a reducing agent (urea solution with the concentration of 32.5%) needs to be sprayed into a mixer of an engine exhaust system, and the mixer is used for promoting the mixing and atomizing effects of catalysts such as urea and the like and tail gas, so that the catalysts such as urea and the like can fully react with NOx in the tail gas, and the phenomenon of deposition on a pipe wall after the urea is sprayed is reduced.
The function of the urea mixer in the whole system is crucial, and the mixing effect of urea and tail gas is determined, so that the performance of the whole system is influenced, and the patent CN201910600550.X changes the flowing characteristic of airflow by utilizing the pipe diameter change, so that the mixing uniformity of urea and exhaust gas is improved. Patent CN201811390687.9 designs a pre-stage swirl mixer in front of the nozzle and a post-stage mixer at a proper position at the rear end of the nozzle. The front-stage swirl mixer forms rotating airflow to mix urea and waste gas, so that rapid heat absorption and decomposition of urea liquid drops are promoted, and the urea liquid drops are not directly contacted with the front-stage swirl mixer, so that crystallization risks caused by attachment of the urea liquid drops on the front-stage swirl mixer are avoided, the urea injection amount is large under the working condition of low rotating speed of six stages in China of a diesel engine, the airflow velocity of the variable-diameter or swirl mixer is not uniform, and crystallization is easily formed in a region with slow flow velocity; patent CN201810054166.X adopts a cyclone tube and steel wool structure, and the contact area of urea and gas of the mixer is limited.
In the prior art, the following disadvantages exist: 1. the air flow velocity of the mixer is uneven, the area with lower velocity of flow is easy to form crystals 2. only steel wool can be arranged at the bottom of the mixing cavity, the urea distribution area is small, the urea evaporation is not facilitated, and the crystallization risk is high.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is not enough to the above-mentioned of prior art, provide a be applied to the blender in the tail gas aftertreatment, make reductant and engine exhaust intensive mixing even, have splendid urea mixed evaporation effect, under reasonable urea injection quantity, the crystallization does not have, has reduced the market maintenance cost.
The utility model adopts the technical proposal that: the utility model provides a high-efficient blender of SCR, includes the barrel, the barrel in be equipped with the guiding device who separates it for left cavity and right cavity, the last whirl hybrid tube that is equipped with of guiding device, and the whirl hybrid tube be located the left cavity at guiding device top, barrel top be equipped with the nozzle holder that is used for installing the nozzle, nozzle holder and whirl hybrid tube intercommunication, guiding device in be equipped with interior stainless wire net, guiding device pot head be equipped with outer stainless wire net down, be equipped with the otter board in the right cavity of barrel, the otter board on be equipped with a plurality of guide plates, left cavity, whirl hybrid tube, guiding device, right cavity communicate in proper order.
As further improvement, guiding device include baffle, lower baffle, mounting panel and honeycomb duct, the mounting panel both ends be connected with last baffle, lower baffle respectively, the other end of going up baffle, lower baffle all with the inner wall connection of barrel, the honeycomb duct peg graft on the mounting panel, the upper end of whirl hybrid tube installation honeycomb duct, interior stainless wire net install in the honeycomb duct, outer stainless wire net install on the periphery of honeycomb duct lower extreme.
Furthermore, the bottom of the rotational flow mixing pipe is provided with a plurality of supporting blocks, the top of the flow guide pipe is provided with a mounting groove, and the rotational flow mixing pipe is clamped in the mounting groove of the flow guide pipe through the supporting blocks.
Furthermore, the inner stainless steel wire net and the outer stainless steel wire net are both conical structures, and the minimum ends of the inner stainless steel wire net and the outer stainless steel wire net are arranged upwards.
Furthermore, the axes of the inner stainless steel wire mesh and the outer stainless steel wire mesh are located on the same axis.
Furthermore, the rotational flow mixing pipe is of a conical structure with a narrow upper part and a wide lower part.
Furthermore, a plurality of rectangular holes are formed in the periphery of the cyclone mixing pipe, and the long edge of each rectangular hole on the same side is correspondingly connected with a rectangular blade.
Further, the inner stainless steel wire net and the outer stainless steel wire net are both of a multi-layer wire net structure, and each layer is formed by weaving stainless steel wires in a 90-degree staggered mode.
Advantageous effects
Compared with the prior art, the utility model, have following advantage:
the utility model discloses a high-efficient blender of SCR adopts the multilayer silk screen structure of crisscross weaving, and steel wire fine hair scheme on the present market, stable in structure produces the uniformity good. The multilayer structure can arrange different layers and intervals according to requirements, and is suitable for engine exhaust systems with different requirements. Interior stainless wire net, outer stainless wire net, the appearance structure is the toper, and more traditional bottom spinning cake structure, the distribution area of urea is bigger, is favorable to urea to increase send out and exhaust the mixture, and the outflow blender of homogeneity has the characteristics that the practicality is strong, application scope is wide under the guide plate effect.
Drawings
Fig. 1 is a schematic view of the structure of the present invention;
fig. 2 is a schematic view of a part of the structure of the present invention.
Wherein: 1-cylinder, 2-nozzle holder, 3-flow guide device, 4-rotational flow mixing pipe, 5-flow mixing cavity, 6-inner stainless steel wire mesh, 7-outer stainless steel wire mesh, 8-flow guide plate, 9-rectangular blade, 10-rectangular hole, 11-supporting block, 12-left cavity, 13-right cavity, 14-screen plate, 31-upper baffle, 32-mounting plate, 33-flow guide pipe and 34-lower baffle.
Detailed Description
The invention will be further described with reference to specific embodiments shown in the drawings.
Referring to fig. 1-2, the utility model relates to a high-efficiency mixer of SCR, which comprises a cylinder 1, a flow guiding device 3 is arranged in the cylinder 1 and divides the cylinder into a left cavity 12 and a right cavity 13, a rotational flow mixing tube 4 is arranged on the flow guiding device 3, the rotational flow mixing tube 4 is arranged in the left cavity 12 at the top of the flow guiding device 3, a nozzle holder 2 for installing a nozzle is arranged above the cylinder 1, the nozzle holder 2 is communicated with the rotational flow mixing tube 4, an inner stainless steel wire net 6 is arranged in the flow guiding device 3, an outer stainless steel wire net 7 is sleeved at the lower end of the flow guiding device 3, a screen plate 14 is arranged in the right cavity 13 of the cylinder 1, a plurality of flow guiding plates 8 are arranged on the screen plate 14, the left cavity 12, the rotational flow mixing tube 4, the flow guiding device 3 and the right cavity 13 are sequentially communicated, after the airflow channel cylinder 1, the airflow channel enters into a mixed flow cavity 5 of a flow guiding tube 33 from a rectangular hole 10 of the rotational flow mixing tube 4, the gas is guided by the rectangular blade 9 of the rotational flow mixing pipe 4 to form spiral gas flow and is mixed with the reducing agent sprayed by the nozzle, so that NO in the gas flow is mixedXFully react with the reductant, later the air current through interior stainless steel net 6 and outer stainless steel net 7, interior stainless steel net 6 can be according to the demand, and stainless steel net 6 is in honeycomb duct 33 in the installation multilayer number, makes it be applicable to the engine exhaust system of different demands, and at the effect of toper stainless steel net, the urea aqueous solution of big granule is smashed, has increaseed urea distribution area simultaneously, is favorable to urea evaporation and waste gas mixing reaction, the outflow blender of gas homogeneity under the effect of guide plate 8 at last.
Specifically, the guiding device 3 comprises an upper partition plate 31, a lower partition plate 34, a mounting plate 32 and a guiding pipe 33, two ends of the mounting plate 32 are respectively connected with the upper partition plate 31 and the lower partition plate 34, the other ends of the upper partition plate 31 and the lower partition plate 34 are respectively connected with the inner wall of the barrel 1, the guiding pipe 33 is inserted into the mounting plate 32, the rotational flow mixing pipe 4 is arranged at the upper end of the guiding pipe 33, and an inner stainless steel wire mesh is arranged on the rotational flow mixing pipe 46 are arranged in a draft tube 33, an outer stainless steel wire mesh 7 is arranged on the periphery of the lower end of the draft tube 33, the barrel 1 is divided into a left cavity 12 and a right cavity 13 which are sealed under the action of an upper partition plate 31, a lower partition plate 34 and a mounting plate 32, air flow can only flow in from a rotational flow mixing tube 4 arranged at the upper end of the draft tube 33, gas flows in and then reacts with urea aqueous solution in the draft tube 33, and the urea aqueous solution better reacts with NO in the gas under the action of the conical stainless steel wire meshXThe reaction is carried out, so that the effect is better.
Further, 4 bottoms of whirl mixing tube are equipped with a plurality of supporting shoes 11, and the mounting groove has been seted up at honeycomb duct 33 top, and whirl mixing tube 4 passes through 11 joints of supporting shoe in the mounting groove of honeycomb duct 33, and the whirl mixing tube 4 of being convenient for is installed on honeycomb duct 33, when needing to be changed whirl mixing tube 4, only need take away alright change, and is very convenient.
Further, interior stainless steel net 6 and outer stainless steel net 7 are the toper structure to the minimum end of interior stainless steel net 6 and outer stainless steel net 7 all arranges up, and at the effect of toper stainless steel net, the urea aqueous solution of large granule is smashed, has increaseed urea distribution area simultaneously, is favorable to urea evaporation and waste gas mixing reaction, reduces the emergence of crystallization phenomenon simultaneously.
Furthermore, the axes of the inner stainless steel wire mesh 6 and the outer stainless steel wire mesh 7 are located on the same axis, so that the airflow can smoothly flow through the inner stainless steel wire mesh 6 and the outer stainless steel wire mesh 7.
Furthermore, the rotational flow mixing pipe 4 is of a conical structure with a narrow upper part and a wide lower part, and the inner diameter of the rotational flow mixing pipe 4 is gradually increased from top to bottom, so that the speed of the flowing air flow is changed, the mixing uniformity of urea and gas is improved, and the NO in the urea and the gas is reducedXBetter reaction.
Further, a plurality of rectangular holes 10 have been seted up on the whirl mixing tube 4 periphery, and the long limit of every rectangular hole 10 homonymy all corresponds and is connected with rectangular blade 9, and gaseous by rectangular hole 10 inflow whirl mixing tube 4 formation swirl telemechanical under rectangular blade 9's guide, swirl telemechanical makes the reaction more abundant.
Furthermore, the inner stainless steel wire net 6 and the outer stainless steel wire net 7 are both of a multi-layer wire net structure, each layer is formed by weaving stainless steel wires in a 90-degree staggered mode, the small holes are standard squares, the shapes of the small holes are fixed, the structure is stable, and the production consistency is good.
The above is only the preferred embodiment of the present invention, and it should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the utility model and the utility of the patent.
Claims (8)
1. The utility model provides a high-efficient blender of SCR, a serial communication port, including barrel (1), barrel (1) in be equipped with water conservancy diversion device (3) of separating it for left cavity (12) and right cavity (13), be equipped with whirl hybrid tube (4) on water conservancy diversion device (3), and whirl hybrid tube (4) be located left cavity (12) at water conservancy diversion device (3) top, barrel (1) top be equipped with nozzle seat (2) that are used for installing the nozzle, nozzle seat (2) and whirl hybrid tube (4) intercommunication, water conservancy diversion device (3) in be equipped with interior stainless steel wire net (6), water conservancy diversion device (3) lower pot head be equipped with outer stainless steel wire net (7), be equipped with otter board (14) in right cavity (13) of barrel (1), otter board (14) on be equipped with a plurality of guide plates (8), left cavity (12), The rotational flow mixing pipe (4), the flow guide device (3) and the right cavity (13) are communicated in sequence.
2. The efficient mixer for SCR of claim 1, wherein the flow guide device (3) comprises an upper partition plate (31), a lower partition plate (34), a mounting plate (32) and a flow guide pipe (33), two ends of the mounting plate (32) are respectively connected with the upper partition plate (31) and the lower partition plate (34), the other ends of the upper partition plate (31) and the lower partition plate (34) are respectively connected with the inner wall of the cylinder body (1), the flow guide pipe (33) is inserted into the mounting plate (32), the upper end of the flow guide pipe (33) is installed on the rotational flow mixing pipe (4), the inner stainless steel wire mesh (6) is installed in the flow guide pipe (33), and the outer stainless steel wire mesh (7) is installed on the periphery of the lower end of the flow guide pipe (33).
3. The SCR high-efficiency mixer according to claim 2, wherein a plurality of support blocks (11) are arranged at the bottom of the cyclone mixing tube (4), an installation groove is arranged at the top of the guide tube (33), and the cyclone mixing tube (4) is clamped in the installation groove of the guide tube (33) through the support blocks (11).
4. An SCR high-efficiency mixer according to claim 1, characterized in that the inner stainless steel wire net (6) and the outer stainless steel wire net (7) are both conical structures, and the smallest ends of the inner stainless steel wire net (6) and the outer stainless steel wire net (7) are both arranged upwards.
5. An SCR high efficiency mixer according to claim 4, wherein the axes of the inner stainless steel mesh (6) and the outer stainless steel mesh (7) are on the same axis.
6. An SCR high-efficiency mixer according to claim 1, wherein the swirl mixing tube (4) is a tapered structure with a narrow top and a wide bottom.
7. The SCR high-efficiency mixer according to claim 1, wherein the periphery of the cyclone mixing tube (4) is provided with a plurality of rectangular holes (10), and the long sides of the same side of each rectangular hole (10) are correspondingly connected with rectangular blades (9).
8. The SCR high-efficiency mixer as claimed in claim 1, wherein the inner stainless steel wire net (6) and the outer stainless steel wire net (7) are both multi-layer wire net structure, and each layer is formed by weaving stainless steel wires at 90 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121211520.9U CN214787629U (en) | 2021-06-01 | 2021-06-01 | Efficient SCR mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121211520.9U CN214787629U (en) | 2021-06-01 | 2021-06-01 | Efficient SCR mixer |
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| Publication Number | Publication Date |
|---|---|
| CN214787629U true CN214787629U (en) | 2021-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121211520.9U Active CN214787629U (en) | 2021-06-01 | 2021-06-01 | Efficient SCR mixer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175373A (en) * | 2021-06-01 | 2021-07-27 | 广西玉柴机器股份有限公司 | Efficient SCR mixer |
| CN114320545A (en) * | 2021-12-27 | 2022-04-12 | 浙江银轮机械股份有限公司 | Mixer of engine tail gas after-treatment system |
-
2021
- 2021-06-01 CN CN202121211520.9U patent/CN214787629U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175373A (en) * | 2021-06-01 | 2021-07-27 | 广西玉柴机器股份有限公司 | Efficient SCR mixer |
| CN114320545A (en) * | 2021-12-27 | 2022-04-12 | 浙江银轮机械股份有限公司 | Mixer of engine tail gas after-treatment system |
| CN114320545B (en) * | 2021-12-27 | 2023-09-12 | 浙江银轮机械股份有限公司 | Mixer of engine tail gas aftertreatment system |
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