CN213270021U - Tail gas aftertreatment mixer - Google Patents
Tail gas aftertreatment mixer Download PDFInfo
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- CN213270021U CN213270021U CN202022151526.3U CN202022151526U CN213270021U CN 213270021 U CN213270021 U CN 213270021U CN 202022151526 U CN202022151526 U CN 202022151526U CN 213270021 U CN213270021 U CN 213270021U
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Abstract
The utility model discloses a tail gas aftertreatment mixer, wherein an inner shell divides the interior of an outer shell into an air inlet cavity and an air outlet cavity, a mixing pipe is communicated with the air inlet cavity and the air outlet cavity, one end surface of the inner shell is provided with a front baffle, the other end part of the inner shell is provided with a rear baffle, and the rear baffle corresponds to the inner shell and is provided with an opening; the lower part of the front baffle is provided with a plurality of through holes. The lower part of the front baffle of the utility model is provided with a plurality of through holes, and the tail gas airflow can directly enter the air outlet cavity from the through holes, on one hand, the effective flowing cross-sectional area of the airflow is increased, the flowing resistance of the airflow is reduced, the back pressure of the airflow is reduced, and further, the pressure loss is reduced; on the other hand, the air flow entering from the through holes directly blows the bottom of the inner shell, so that urea liquid drops falling on the bottom surface of the inner shell can be evaporated and decomposed by absorbing heat fully, and urea crystals and crystal accumulation caused by deposition of the urea liquid drops on the bottom surface of the inner shell are avoided.
Description
Technical Field
The utility model belongs to the technical field of engine exhaust aftertreatment technique and specifically relates to a tail gas aftertreatment blender.
Background
Currently, in an engine exhaust gas after-treatment system, a Selective Catalytic Reduction (SCR) technology is generally adopted to carry out after-treatment on exhaust gas emission of an engine, a urea aqueous solution is sprayed into an exhaust gas after-treatment mixer, and the urea aqueous solution is decomposed into ammonia (NH) at an exhaust gas temperature3) Ammonia gas (NH) under the action of catalyst3) Removing Nitrogen Oxides (NO) from exhaust gasesX) Reduction to harmless nitrogen (N)2) And water (H)2O), and finally discharged from the tail gas pipe, thereby achieving the purpose of reducing the emission.
The Chinese utility model 201922059316.9 discloses a tail gas post-treatment mixing device, wherein an inner shell divides the interior of an outer shell into an air inlet cavity and an air outlet cavity, and a mixing pipe is communicated with the air inlet cavity and the air outlet cavity; one end face of the inner shell is provided with a front baffle, and the other end face of the inner shell is provided with a rear baffle; the urea nozzle sprays urea liquid drops towards the mixing pipe, tail gas enters the mixing pipe from the gas inlet cavity to be mixed with the urea liquid drops, and the urea liquid drops are reacted. The tail gas aftertreatment mixing device has the following problems: (1) the mixing pipe is over against the bottom surface of the inner shell, the urea nozzle is over against the mixing pipe, and the urea liquid drops with larger particles sprayed into the mixing pipe can fall onto the bottom surface of the inner side of the inner shell without being sufficiently crushed and volatilized, and are easy to deposit on the bottom surface of the inner shell to form urea crystals; (2) the mixer is higher in the height that the chamber stretches out of admitting air, has certain the blockking to the air current that gets into the chamber of admitting air and the air current that the chamber of admitting air got into the hybrid tube, and intake pressure is great relatively.
SUMMERY OF THE UTILITY MODEL
The applicant aims at the defects that urea crystals are easily formed on the bottom surface of the inner shell of the existing tail gas aftertreatment mixing device and the air inlet pressure is relatively large, and provides a tail gas aftertreatment mixer with a reasonable structure, so that the risk of urea crystals formed on the bottom surface of the inner shell is reduced, and the air inlet pressure is relatively small.
The utility model discloses the technical scheme who adopts as follows:
a tail gas aftertreatment mixer is characterized in that an inner shell divides the interior of an outer shell into an air inlet cavity and an air outlet cavity, a mixing pipe is communicated with the air inlet cavity and the air outlet cavity, one end face of the inner shell is provided with a front baffle, the other end of the inner shell is provided with a rear baffle, and the rear baffle is provided with an opening corresponding to the inner shell; the lower part of the front baffle is provided with a plurality of through holes.
The lower part of the front baffle of the utility model is provided with a plurality of through holes, and the tail gas airflow can directly enter the air outlet cavity from the through holes, on one hand, the effective flowing cross-sectional area of the airflow is increased, the flowing resistance of the airflow is reduced, the back pressure of the airflow is reduced, and further, the pressure loss is reduced; on the other hand, the air flow entering from the through holes directly blows the bottom of the inner shell, so that urea liquid drops falling on the bottom surface of the inner shell can be evaporated and decomposed by absorbing heat fully, and urea crystals and crystal accumulation caused by deposition of the urea liquid drops on the bottom surface of the inner shell are avoided.
As a further improvement of the above technical solution:
the through holes are positioned on the front baffle and close to the bottom of the inner shell.
The through holes are arranged in an array mode, and the through holes in all rows are arranged in a staggered mode.
A spoiler is fixedly arranged behind the opening of the rear baffle, and a certain distance is reserved between the spoiler and the rear baffle.
The spoiler of the utility model has the functions of blocking and deflecting the airflow flowing out of the air outlet cavity, on one hand, the airflow can be prevented from blowing the carrier in the SCR device; on the other hand, the air flow can be guided to change direction and flow in the obliquely upward direction, the difference of the upper and lower flow velocity caused by the opening in the shell is reduced, the uniformity of the flow velocity of the air is improved, meanwhile, the air flow flows in the obliquely upward direction, the mixing path of the air flow can be prolonged, and the uniformity of urea mixing is improved.
The mixing tube is arranged on the inner shell in a penetrating way, and the tube body of the mixing tube is completely extended into the air outlet cavity.
The upper end surface of the mixing pipe is flush with the upper surface of the inner shell.
The utility model discloses a mixing tube does not basically have the effect of blockking to the air current that gets into the chamber of admitting air, and the air current of the intracavity of admitting air gets into the mixing tube in addition, also need not experience many turns, directly along just can getting into in the mixing tube, and inlet pressure is little, and airflow pressure loss is little.
The bottom of the front baffle is provided with a convex part in a downward protruding mode, and the bottom side of the convex part is welded and fixed on the inner wall surface of the shell.
The utility model discloses a preceding baffle passes through the bellying support to be fixed on the shell, can increase the intensity of preceding baffle, avoids preceding baffle to take place to warp.
The inside of the mixing pipe is provided with a crushing assembly.
The utility model has the advantages as follows:
the lower part of the front baffle of the utility model is provided with a plurality of through holes, and the tail gas airflow can directly enter the air outlet cavity from the through holes, on one hand, the effective flowing cross-sectional area of the airflow is increased, the flowing resistance of the airflow is reduced, the back pressure of the airflow is reduced, and further, the pressure loss is reduced; on the other hand, the air flow entering from the through holes directly blows the bottom of the inner shell, so that urea liquid drops falling on the bottom surface of the inner shell can be evaporated and decomposed by absorbing heat fully, and urea crystals and crystal accumulation caused by deposition of the urea liquid drops on the bottom surface of the inner shell are avoided.
The spoiler of the utility model has the functions of blocking and deflecting the airflow flowing out of the air outlet cavity, on one hand, the airflow can be prevented from blowing the carrier in the SCR device; on the other hand, the air flow can be guided to change direction and flow in the obliquely upward direction, the difference of the upper and lower flow velocity caused by the opening in the shell is reduced, the uniformity of the flow velocity of the air is improved, meanwhile, the air flow flows in the obliquely upward direction, the mixing path of the air flow can be prolonged, and the uniformity of urea mixing is improved.
The utility model discloses a mixing tube does not basically have the effect of blockking to the air current that gets into the chamber of admitting air, and the air current of the intracavity of admitting air gets into the mixing tube in addition, also need not experience many turns, directly along just can getting into in the mixing tube, and inlet pressure is little, and airflow pressure loss is little.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a perspective view from another angle, similar to fig. 1.
Fig. 3 is an exploded view of fig. 1.
Fig. 4 is a cross-sectional view of fig. 2.
Fig. 5 is an enlarged view of a portion a in fig. 4.
In the figure: 1. a housing; 2. a nozzle holder; 3. a front baffle; 31. a through hole; 32. a boss portion; 4. an inner shell; 5. a tailgate; 51. an opening; 6. a mixing tube; 7. a spoiler; 8. a crushing assembly; 9. an air inlet cavity; 10. and an air outlet cavity.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, 2 and 3, an inner shell 4 is arranged in the inner cavity of the cylindrical outer shell 1 of the present invention, and the inner shell 4 is located at the middle lower part of the inner cavity; as shown in fig. 4, the inner shell 4 divides the inner cavity of the outer shell 1 into an inlet chamber 9 located outside the inner shell 4 and an outlet chamber 10 located inside the inner shell 4. As shown in fig. 1 and 3, the front end surface of the inner shell 4 is covered with the front baffle 3, and as shown in fig. 2 and 4, the rear end portion of the inner shell 4 is fixed to the rear baffle 5, and the rear baffle 5 is welded to the outer shell 1. A mixing pipe 6 penetrates through the inner shell 4, the pipe body of the mixing pipe 6 basically and completely extends into the air outlet cavity 10, and the upper end surface of the mixing pipe 6 is flush with the upper surface of the inner shell 4 or only penetrates out of the inner shell 4 and slightly extends out of the air inlet cavity 9 by a certain height; the mixing pipe 6 basically has no blocking effect on the airflow entering the air inlet cavity 9, and the airflow in the air inlet cavity 9 can enter the mixing pipe 6 directly along without being turned for many times when entering the mixing pipe 6, so that the air inlet pressure is low, and the pressure loss of the airflow is low. The shell 1 is provided with a nozzle holder 2 opposite to the mixing pipe 6, and the nozzle holder 2 is connected with the urea nozzle. The utility model discloses the setting is between DPF (granule trapper) subassembly and the SCR subassembly of tail gas aftertreatment, 9 intercommunication DPF outputs in the chamber of admitting air, and 10 intercommunication SCR inputs in the chamber of giving vent to anger.
As shown in fig. 1 and 3, the front baffle 3 plugs the front end opening of the inner shell 4, and the front side edge of the inner shell 4 is welded and fixed on the wall surface of the front baffle 3; as shown in fig. 4 and 5, the plurality of through holes 31 are arranged in an array, are located on the inner side of the inner shell 4 and are close to the bottom of the inner shell 4, and the through holes 31 in each row are arranged in a staggered manner, so that the tail gas flow can directly enter the gas outlet cavity 10 from the plurality of through holes 31, on one hand, the effective flow cross-sectional area of the gas flow is increased, the flow resistance of the gas flow is reduced, the back pressure of the gas flow is reduced, and further, the pressure loss is reduced; on the other hand, the air flow entering from the plurality of through holes 31 directly blows the bottom of the inner shell 4, so that urea liquid drops falling on the bottom surface of the inner shell 4 can be fully evaporated and decomposed by absorbing heat, and urea crystals and crystal accumulation caused by the deposition of the urea liquid drops on the bottom surface of the inner shell 4 are avoided; the bottom of the front baffle 3 protrudes downwards to form a protruding part 32, the bottom side of the protruding part 32 is welded and fixed on the inner wall surface of the shell 1, and the front baffle 3 is supported and fixed on the shell 1 through the protruding part 32, so that the strength of the front baffle 3 can be increased, and the deformation of the front baffle 3 is avoided.
As shown in fig. 3, the back baffle 5 is a circular plate, the outer diameter of the back baffle is matched with the inner diameter of the outer shell 1, an opening 51 is formed in the middle lower part of the back baffle 5 corresponding to the inner shell 4, the shape of the opening 51 is consistent with the outer contour of the inner shell 4, and the inner shell 4 is clamped, welded and fixed on the opening 51; the cross-sectional area of the rear baffle 5 in the outer shell 1 and outside the inner shell 4 is blocked, so that the situation that the airflow in the air inlet cavity 9 directly flows into the SCR input end without mixing and further influences the NO of the SCR component is avoidedXThe conversion of (a).
As shown in fig. 2, a spoiler 7 is fixedly disposed inside the housing 1 behind the opening 51 of the backplate 5, a certain distance is provided between the spoiler 7 and the backplate 5, the spoiler 7 is a circular arc-shaped plate with a minor arc, and the spoiler 7 blocks and redirects the airflow flowing out of the air outlet cavity 10, so that on one hand, the airflow can be prevented from directly blowing the carrier in the SCR device; on the other hand, the airflow can be guided to change direction and flow in an obliquely upward direction, the difference of the upper and lower flow velocities caused by the opening 51 in the shell 1 is reduced, the uniformity of the flow velocity of the air is improved, meanwhile, the airflow flows in the obliquely upward direction, the mixing path of the airflow can be prolonged, and the uniformity of urea mixing is improved.
As shown in fig. 3, mixing tube 6 is inside to be fixed and to be provided with broken subassembly 8, and broken subassembly 8 arranges a plurality of layers of crushing plates from last to down in proper order, and the crushing plate of adjacent layer can staggered arrangement, and in this embodiment, broken subassembly 8 includes from last to arranging two-layer crushing plate down, when guaranteeing to play better crushing effect to the urea liquid drop, has less air current pressure drop.
When the utility model works, the urea nozzle in the nozzle seat 2 sprays urea liquid drops into the air inlet cavity 9 and the mixing pipe 6, and tail gas flow is input from the output end of the DPF; the tail gas air current mixes with urea liquid drop in admitting air chamber 9 and mixing tube 6, makes the urea liquid drop fully volatilize and decompose the back, and the mixed gas flow that obtains gets into and goes out the gas chamber 10, and the gas is after going out gas chamber 10 further mixing, exports the input to the SCR from going out gas chamber 10.
The utility model discloses a plurality of through-holes 31 of seting up of 3 lower parts of preceding baffle, when reducing the air current backpressure, can also avoid 4 bottom surfaces of inner shell to form the urea crystallization.
The above description is illustrative of the present invention and is not intended to limit the present invention, and the present invention may be modified in any manner without departing from the spirit of the present invention.
Claims (8)
1. An exhaust aftertreatment mixer, its characterized in that: the inner shell (4) divides the interior of the outer shell (1) into an air inlet cavity (9) and an air outlet cavity (10), the mixing pipe (6) is communicated with the air inlet cavity (9) and the air outlet cavity (10), one end face of the inner shell (4) is provided with a front baffle (3), the other end face of the inner shell (4) is provided with a rear baffle (5), and the rear baffle (5) is provided with an opening (51) corresponding to the inner shell (4); the lower part of the front baffle (3) is provided with a plurality of through holes (31).
2. The exhaust aftertreatment mixer of claim 1, wherein: the through holes (31) are positioned on the front baffle (3) and are close to the bottom of the inner shell (4).
3. The exhaust aftertreatment mixer of claim 1, wherein: the through holes (31) are arranged in an array mode, and the through holes (31) in each row are arranged in a staggered mode.
4. The exhaust aftertreatment mixer of claim 1, wherein: a spoiler (7) is fixedly arranged behind the opening (51) of the rear baffle (5), and a certain distance is reserved between the spoiler (7) and the rear baffle (5).
5. The exhaust aftertreatment mixer of claim 1, wherein: the mixing pipe (6) is arranged on the inner shell (4) in a penetrating way, and the pipe body of the mixing pipe (6) is completely extended into the air outlet cavity (10).
6. The exhaust aftertreatment mixer of claim 5, wherein: the upper end surface of the mixing pipe (6) is flush with the upper surface of the inner shell (4).
7. The exhaust aftertreatment mixer of claim 1, wherein: the bottom of the front baffle (3) is provided with a convex part (32) in a downward protruding way, and the bottom side of the convex part (32) is welded and fixed on the inner wall surface of the shell (1).
8. The exhaust aftertreatment mixer of claim 1, wherein: a crushing component (8) is arranged in the mixing pipe (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022151526.3U CN213270021U (en) | 2020-09-27 | 2020-09-27 | Tail gas aftertreatment mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022151526.3U CN213270021U (en) | 2020-09-27 | 2020-09-27 | Tail gas aftertreatment mixer |
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| Publication Number | Publication Date |
|---|---|
| CN213270021U true CN213270021U (en) | 2021-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022151526.3U Active CN213270021U (en) | 2020-09-27 | 2020-09-27 | Tail gas aftertreatment mixer |
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| CN (1) | CN213270021U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114320546A (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 |
-
2020
- 2020-09-27 CN CN202022151526.3U patent/CN213270021U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114320546A (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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