CN214403717U - SCR urea mixer - Google Patents
SCR urea mixer Download PDFInfo
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- CN214403717U CN214403717U CN202120333219.9U CN202120333219U CN214403717U CN 214403717 U CN214403717 U CN 214403717U CN 202120333219 U CN202120333219 U CN 202120333219U CN 214403717 U CN214403717 U CN 214403717U
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Abstract
The utility model discloses an SCR urea mixer, a front baffle is arranged in a shell, a rear baffle is arranged at the rear side of the front baffle, and side baffles are covered at the left side and the right side of the rear baffle; the rear baffle and the side baffles on the two sides divide a cavity in the shell, which is positioned at the rear side of the front baffle, into an inner cavity with an open bottom surface; a first pore plate, a second pore plate and a first pore plate which are arranged in the inner cavity from top to bottom in sequence and have intervalsA baffle. The utility model discloses an inner chamber is divided into a plurality of regions, and the air current flows in a plurality of regions, and the urea liquid drop accomplishes decomposition and mixing many times in a plurality of regions, has improved the homogeneity of mixing of ammonia, and then improves NOxThe conversion rate of the catalyst ensures the overall performance of the catalyst; and the decomposition and mixing of the urea liquid drops are carried out in the inner cavity, the inner cavity has a heat preservation effect, the wall surfaces of all parts in the inner cavity are guaranteed to have a higher temperature, the urea liquid drops can absorb heat and volatilize sufficiently, the crystallization risk of the urea is reduced, and the NO is improvedxThe conversion of (a).
Description
Technical Field
The utility model belongs to the technical field of engine exhaust aftertreatment technique and specifically relates to a SCR urea mixer.
Background
In the engine exhaust after-treatment system, selective catalytic reduction technology is usually adopted(SCR) post-treatment of exhaust emissions from the engine; in order to ensure that urea liquid drops can be fully and uniformly mixed with the tail gas of the diesel engine in the aftertreatment system, a mixer is added in the aftertreatment system, urea aqueous solution is sprayed into the mixer, and the urea aqueous solution is heated by the tail gas and decomposed into ammonia (NH)3) 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 crystallization risk in the existing post-treatment urea mixer is high, the mixing uniformity of ammonia gas is poor, the conversion efficiency of nitrogen oxides is poor, and partial ammonia is easy to escape, so that the overall performance of a catalyst is influenced.
SUMMERY OF THE UTILITY MODEL
The applicant provides a reasonable-structure SCR urea mixer aiming at the defects of high crystallization risk, poor ammonia mixing uniformity and the like of the post-treatment urea mixer, and the SCR urea mixer is low in crystallization risk and high in ammonia mixing uniformity.
The utility model discloses the technical scheme who adopts as follows:
an SCR urea mixer, a front baffle is arranged in a shell, a rear baffle is arranged at the rear side of the front baffle, and a plurality of air inlets are formed in the front baffle; the rear baffle is provided with a transverse plate part and an arc plate part, and the arc plate part is positioned behind the front baffle and hangs downwards; the left side and the right side of the rear baffle are covered with side baffles; the rear baffle and the side baffles on the two sides divide a cavity in the shell and positioned at the rear side of the front baffle into an inner cavity with an open bottom surface, and an air inlet of the front baffle is communicated with the inner cavity; a first pore plate, a second pore plate and a first guide plate which are arranged in the inner cavity from top to bottom in sequence and have intervals with each other; the first pore plate is provided with a plurality of first through holes; the second pore plate is provided with a vertical plate part and a hole opening part, and the hole opening part is positioned under the first pore plate and is provided with a plurality of second through holes; the inner cavity is divided into an area A located above the first pore plate, an area B located below the first pore plate and above the hole opening part of the second pore plate, an area C located below the hole opening part and above the first guide plate, an area D located behind the vertical plate part of the second pore plate and an area E located behind the first guide plate.
The utility model discloses an inner chamber is divided into a plurality of regions, and the air current flows in a plurality of regions, and the urea liquid drop accomplishes decomposition and mixing many times in a plurality of regions, has improved the homogeneity of mixing of ammonia, and then improves NOxThe conversion rate of the catalyst ensures the overall performance of the catalyst; and the decomposition and mixing of the urea liquid drops are carried out in the inner cavity, the inner cavity has a heat preservation effect, the wall surfaces of all parts in the inner cavity are guaranteed to have a higher temperature, the urea liquid drops can absorb heat and volatilize sufficiently, the crystallization risk of the urea is reduced, and the NO is improvedxThe conversion of (a).
As a further improvement of the above technical solution:
the air inlet of the front baffle is provided with a blade, and the blade is obliquely opened downwards towards the opening parts of the first pore plate and the second pore plate.
The utility model discloses a plurality of blades of preceding baffle can guide the air current to blow downwards to the trompil portion of first orifice plate, second orifice plate to one side, preheats first orifice plate, trompil portion, makes the urea liquid drop of drippage fully absorb heat and volatilize, avoids producing the urea crystallization, reduces the crystallization risk.
A plurality of small blades are arranged on the air inlet on the uppermost side in parallel, and a gap is formed between every two small blades to form an overflowing gap.
The middle part of the second pore plate is provided with a plurality of guide holes, guide vanes are arranged on the guide holes, and the guide vanes are opened backwards and obliquely upwards.
The utility model discloses a guide vane guide air current blows to the rear side wall face of diaphragm portion and the upside wall of arc board towards slant ascending direction, preheats corresponding wall, avoids producing the urea crystallization, reduces the crystallization risk.
A plurality of third through holes are formed in the upper end portion, close to the transverse plate portion, of the vertical plate portion of the second hole plate, and the third through holes are located right behind the small blades of the front baffle.
The utility model discloses a plurality of third through-holes are located the vanelet of preceding baffle directly the rear, and the clearance of overflowing between each vanelet can guarantee that the air current directly flows backward and blows to a plurality of third through-holes and pass from the third through-hole, preheats diaphragm portion and arc portion top wall face, avoids producing the urea crystallization, reduces the crystallization risk.
A second guide plate is arranged below the first guide plate, and an area F is formed below the first guide plate and above the second guide plate.
The first guide plate and the second guide plate are arc-shaped panels; the arc central axis of the first guide plate is orthogonal to the central axis of the shell, and the arc central axis of the second guide plate is parallel to the central axis of the shell.
The utility model discloses a first guide plate can guide the air current to flow along the cambered surface, does benefit to and reduces the air current backpressure. The utility model discloses a second guide plate can gather together the air current that the inner chamber flows down and towards the back water conservancy diversion, does benefit to and reduces the air current backpressure.
A third guide plate is arranged in the shell and below the arc plate part of the rear baffle, and the lower edge of the arc plate part and the upper edge of the third guide plate have a distance to form an airflow channel; the third guide plate is positioned behind the second guide plate; the third guide plate is provided with a plurality of fourth through holes.
And a sleeve is arranged on the transverse plate part of the rear baffle plate and is positioned right above the first pore plate in a penetrating manner, and the sleeve is communicated with the area A.
The casing is provided with a nozzle seat opposite to the sleeve.
The utility model has the advantages as follows:
the utility model discloses an inner chamber is divided into a plurality of regions, and the air current flows in a plurality of regions, and the urea liquid drop accomplishes decomposition and mixing many times in a plurality of regions, has improved the homogeneity of mixing of ammonia, and then improves NOxThe conversion rate of the catalyst ensures the overall performance of the catalyst; and the decomposition and mixing of the urea liquid drops are carried out in the inner cavity, the inner cavity has a heat preservation effect, the wall surfaces of all parts in the inner cavity are guaranteed to have a higher temperature, the urea liquid drops can absorb heat and volatilize sufficiently, the crystallization risk of the urea is reduced, and the NO is improvedxThe conversion of (a).
The utility model discloses a plurality of blades of preceding baffle can guide the air current to blow downwards to the trompil portion of first orifice plate, second orifice plate to one side, preheats first orifice plate, trompil portion, makes the urea liquid drop of drippage fully absorb heat and volatilize, avoids producing the urea crystallization, reduces the crystallization risk.
The utility model discloses a guide vane guide air current blows to the rear side wall face of diaphragm portion and the upside wall of arc board towards slant ascending direction, preheats corresponding wall, avoids producing the urea crystallization, reduces the crystallization risk.
The utility model discloses a plurality of third through-holes are located the vanelet of preceding baffle directly the rear, and the clearance of overflowing between each vanelet can guarantee that the air current directly flows backward and blows to a plurality of third through-holes and pass from the third through-hole, preheats diaphragm portion and arc portion top wall face, avoids producing the urea crystallization, reduces the crystallization risk.
The utility model discloses a first guide plate can guide the air current to flow along the cambered surface, does benefit to and reduces the air current backpressure.
The utility model discloses a second guide plate can gather together the air current that the inner chamber flows down and towards the back water conservancy diversion, does benefit to and reduces the air current backpressure.
Drawings
Fig. 1 is an exploded view of the present invention.
Fig. 2 is a longitudinal sectional view of the present invention.
In the figure: 1. a housing; 2. a nozzle holder; 3. a front baffle; 31. an air inlet; 32. a large leaf; 33. a small blade; 4. a tailgate; 41. a lateral plate portion; 42. an arc plate portion; 5. A side dam; 6. a first orifice plate; 61. a first through hole; 7. a second orifice plate; 71. a vertical plate portion; 72. an opening part; 73. a second through hole; 74. a flow guide hole; 75. a guide vane; 76. a third through hole; 8. a first baffle; 9. a second baffle; 10. a third baffle; 101. a fourth via hole; 11. a sleeve; 20. an inner cavity; A. b, C, D, E, F, area.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1 and 2, a circular front baffle 3 is vertically arranged on the inner wall surface of the front end of the cylindrical shell 1 along the radial direction, and the outer contour dimension of the front baffle 3 is matched with the inner contour dimension of the shell 1; a plurality of strip-shaped air inlet holes 31 are formed in the upper plate surface array of the front baffle 3, a plurality of small blades 33 are arranged on the air inlet hole 31 at the uppermost side by side, a gap is formed between each small blade 33, an overflowing gap is formed, large blades 32 are arranged on the rest air inlet holes 31, and the large blades 32 and the small blades 33 are both opened backwards and obliquely downwards.
As shown in fig. 1 and 2, a rear baffle 4 is arranged in the housing 1 and behind the front baffle 3, the rear baffle 4 is approximately inverted L-shaped, and has a transverse plate portion 41 perpendicular to the front baffle 3 and an arc plate portion 42 connected to the rear end of the transverse plate portion 41, the arc plate portion 42 is arranged behind the front baffle 3 and hangs down, and the arc of the arc plate portion 42 is convex backward; the front edge of the horizontal plate 41 is fixed to the upper side wall surface of the front panel 3. The left side and the right side of the rear baffle plate 4 are respectively covered with a side baffle plate 5 along the radial direction, the edge contour dimension of the side baffle plate 5 corresponding to the rear baffle plate 4 is matched with the contour dimension of the rear baffle plate 4, the front side edge of the side baffle plate 5 is fixed on the wall surface of the front baffle plate 3, and the radial height of the side baffle plate 5 is slightly smaller than that of the arc plate part 42; the rear baffle 4 and the side baffles 5 on the two sides divide a cavity in the shell 1, which is positioned at the rear side of the front baffle 3, into an inner cavity 20 with an open bottom surface; the air inlet holes 31 of the front baffle 3 are communicated with the inner cavity 20.
As shown in fig. 1 and 2, the first orifice plate 6, the second orifice plate 7, and the first baffle plate 8 are sequentially arranged in the inner cavity 20 from top to bottom. The first hole plate 6 is a concave arc-shaped plate and is provided with a plurality of first through holes 61. The second orifice plate 7 has a vertical plate portion 71 located in front of the arc plate portion 42 and behind the first orifice plate 6, and an outwardly concave arc opening portion 72 located directly below the first orifice plate 6; the opening part 72 is provided with a plurality of second through holes 73, the front end part of the opening part 72 penetrates out of the front baffle 3, and the penetrating part is positioned below a plurality of air inlet holes 31 of the front baffle 3, as shown in fig. 2, a plurality of blades (a large blade 32 and a small blade 33) of the front baffle 3 are obliquely downward opened towards the opening parts 72 of the first orifice plate 6 and the second orifice plate 7, so that air flow can be guided to be obliquely downward blown to the first orifice plate 6 and the opening parts 72, the first orifice plate 6 and the opening parts 72 are preheated, dropped urea liquid drops are fully absorbed and volatilized, the generation of urea crystals is avoided, and the crystallization risk is reduced; a plurality of strip-shaped guide holes 74 are formed in the middle of the second pore plate 7, guide vanes 75 are arranged on the guide holes 74, the guide vanes 75 are opened backwards and upwards in an inclined manner, and the guide vanes 75 guide airflow to blow towards the back side wall surface of the cross plate part 41 and the upper side wall surface of the arc plate part 42 in the upward and inclined direction, so that the corresponding wall surfaces are preheated, urea crystallization is avoided, and the crystallization risk is reduced; the upper edge of the vertical plate portion 71 is fixed to the horizontal plate portion 41, and a plurality of third through holes 76 are opened in the upper end portion of the vertical plate portion 71 near the horizontal plate portion 41. The third through holes 76 are located right behind the small blades 33 of the front baffle 3, and the overflowing gaps between the small blades 33 can ensure that airflow directly flows backwards, blows to the third through holes 76 and passes through the third through holes 76 to preheat the upper side wall surfaces of the transverse plate part 41 and the arc plate part 42, so that urea crystallization is avoided, and the crystallization risk is reduced. First guide plate 8 is outer concave arc panel, and the circular arc center pin of first guide plate 8 and the center pin quadrature of shell 1, first guide plate 8 can guide the air current to flow along the cambered surface, do benefit to and reduce the air current backpressure. The inner cavity 20 is divided into a plurality of areas by the first pore plate 6, the second pore plate 7 and the first guide plate 8: an area a located above the first orifice plate 6, an area B located below the first orifice plate 6 and above the opening portion 72 of the second orifice plate 7, an area C located below the opening portion 72 and above the first baffle 8, an area D located behind the riser portion 71 of the second orifice plate 7, and an area E located diagonally behind the first baffle 8.
As shown in fig. 1 and 2, a concave arc-shaped second guide plate 9 is arranged below the first guide plate 8 at a certain distance, and an arc-shaped central axis of the second guide plate 9 is parallel to a central axis of the housing 1, so that the air flow flowing down from the inner cavity 20 is gathered and guided backwards, and the back pressure of the air flow is reduced; a formation region F below the first baffle 8 and above the second baffle 9.
As shown in fig. 1 and 2, a third air deflector 10 is arranged in the housing 1 and below the arc plate portion 42 of the rear baffle 4, and the lower edge of the arc plate portion 42 and the upper edge of the third air deflector 10 have a distance to form an air flow channel; the third guide plate 10 is located behind the second guide plate 9 and has a certain distance from the second guide plate 9, and the third guide plate 10 is provided with a plurality of fourth through holes 101.
As shown in fig. 1 and 2, a sleeve 11 is inserted through the horizontal plate portion 41 of the tailgate 4 directly above the first orifice plate 6, and the sleeve 11 communicates with the area a. The upper edge of the sleeve 11 is fixed to the inner wall surface of the housing 1. The casing 1 is provided with a nozzle holder 2 opposite to the sleeve 11, and the nozzle holder 2 is connected with the urea nozzle.
When the utility model works, the urea nozzle in the nozzle seat 2 sprays urea liquid drops into the area A through the sleeve 11; the tail gas air current is input from a plurality of air inlets 31 of the front baffle 3, a part of air current blows to the area A, and is mixed with urea liquid drops in the area A to complete the first decomposition and mixing of the urea liquid drops, and the mixed air current flows downwards into the area B through the first orifice 6; the other part of the air flow input from the air inlet hole 31 is directly blown to the area B and is mixed with the air flow flowing in from the first orifice plate 6, and the second decomposition and mixing of urea liquid drops are completed; a part of the air flow in the area B flows downwards into the area C through the opening part 72 of the second orifice plate 7, and the other part of the air flow flows to the area D through the diversion holes 74 of the second orifice plate 7, so that the third decomposition and mixing of the urea liquid drops are respectively completed; the air flow in the area C flows to the area E along the first guide plate 8 and is mixed with the air flow flowing in from the area D, and the fourth decomposition and mixing of the urea liquid drops are completed; the airflow in the region E flows downward into the region F and is discharged by the flow of the second baffle 9 and the third baffle 10.
The utility model discloses an inner chamber 20 is divided into a plurality of regions, and the air current flows in a plurality of regions, and the urea liquid drop accomplishes decomposition and mixing many times in a plurality of regions, has improved the homogeneity of mixing of ammonia, and then improves NOxThe conversion rate of the catalyst ensures the overall performance of the catalyst; and the decomposition and mixing of the urea liquid drops are all carried out in the inner cavity 20, the inner cavity 20 has a heat preservation effect, the wall surfaces of all parts in the inner cavity 20 are guaranteed to have higher temperature, the urea liquid drops can absorb heat and volatilize sufficiently, the urea crystallization risk is reduced, and NO is improvedxThe conversion of (a).
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 (10)
1. The utility model provides a baffle (3) before the SCR urea blender sets up in shell (1), the rear side of preceding baffle (3) sets up backplate (4), its characterized in that: a plurality of air inlet holes (31) are formed in the front baffle (3); the rear baffle (4) is provided with a transverse plate part (41) and an arc plate part (42), and the arc plate part (42) is positioned behind the front baffle (3) and hangs down; the left side and the right side of the rear baffle (4) are covered with side baffles (5); a cavity in the shell (1) and positioned at the rear side of the front baffle (3) is divided into an inner cavity (20) with an open bottom surface by the rear baffle (4) and the side baffles (5) at the two sides, and an air inlet (31) of the front baffle (3) is communicated with the inner cavity (20);
a first pore plate (6), a second pore plate (7) and a first guide plate (8) which are arranged in the inner cavity (20) from top to bottom in sequence and have intervals with each other; the first pore plate (6) is provided with a plurality of first through holes (61); the second pore plate (7) is provided with a vertical plate part (71) and an opening part (72), and the opening part (72) is positioned under the first pore plate (6) and is provided with a plurality of second through holes (73);
the inner cavity (20) is divided into an area A located above the first pore plate (6), an area B located below the first pore plate (6) and above the hole opening part (72) of the second pore plate (7), an area C located below the hole opening part (72) and above the first guide plate (8), an area D located behind the vertical plate part (71) of the second pore plate (7) and an area E located behind the first guide plate (8) in a slanting mode by the first pore plate (6), the second pore plate (7) and the first guide plate (8).
2. The SCR urea mixer of claim 1, wherein: the air inlet (31) of the front baffle (3) is provided with a blade, and the blade is obliquely opened downwards towards the opening parts (72) of the first pore plate (6) and the second pore plate (7).
3. The SCR urea mixer of claim 2, wherein: a plurality of small blades (33) are arranged on the air inlet (31) at the uppermost side in parallel, and a gap is formed between each small blade (33) to form an overflowing gap.
4. The SCR urea mixer of claim 1, wherein: the middle part of the second pore plate (7) is provided with a plurality of guide holes (74), guide vanes (75) are arranged on the guide holes (74), and the guide vanes (75) are opened backwards and obliquely upwards.
5. The SCR urea mixer of claim 1, wherein: a plurality of third through holes (76) are formed in the upper end portion of the vertical plate portion (71) of the second pore plate (7) and close to the transverse plate portion (41), and the third through holes (76) are located right behind the small blades (33) of the front baffle (3).
6. The SCR urea mixer of claim 1, wherein: a second guide plate (9) is arranged below the first guide plate (8), and an area F is formed below the first guide plate (8) and above the second guide plate (9).
7. The SCR urea mixer of claim 1 or 6, wherein: the first guide plate (8) and the second guide plate (9) are arc-shaped panels; the arc central axis of the first guide plate (8) is orthogonal to the central axis of the shell (1), and the arc central axis of the second guide plate (9) is parallel to the central axis of the shell (1).
8. The SCR urea mixer of claim 1, wherein: a third guide plate (10) is arranged in the shell (1) and below the arc plate part (42) of the rear baffle plate (4), and the lower edge of the arc plate part (42) and the upper edge of the third guide plate (10) have a distance to form an airflow channel; the third guide plate (10) is positioned behind the second guide plate (9); the third guide plate (10) is provided with a plurality of fourth through holes (101).
9. The SCR urea mixer of claim 1, wherein: a sleeve (11) is arranged on the transverse plate part (41) of the rear baffle (4) and is positioned right above the first orifice plate (6), and the sleeve (11) is communicated with the area A.
10. The SCR urea mixer of claim 1, wherein: the casing (1) is provided with a nozzle holder (2) opposite to the sleeve (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120333219.9U CN214403717U (en) | 2021-02-05 | 2021-02-05 | SCR urea mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120333219.9U CN214403717U (en) | 2021-02-05 | 2021-02-05 | SCR urea mixer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214403717U true CN214403717U (en) | 2021-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120333219.9U Active CN214403717U (en) | 2021-02-05 | 2021-02-05 | SCR urea mixer |
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| Country | Link |
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| CN (1) | CN214403717U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855315A (en) * | 2021-02-05 | 2021-05-28 | 无锡亿利环保科技有限公司 | SCR urea mixer |
-
2021
- 2021-02-05 CN CN202120333219.9U patent/CN214403717U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855315A (en) * | 2021-02-05 | 2021-05-28 | 无锡亿利环保科技有限公司 | SCR urea mixer |
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