CN112459874B - Mixing assembly of urea mixing device - Google Patents
Mixing assembly of urea mixing device Download PDFInfo
- Publication number
- CN112459874B CN112459874B CN202011426317.3A CN202011426317A CN112459874B CN 112459874 B CN112459874 B CN 112459874B CN 202011426317 A CN202011426317 A CN 202011426317A CN 112459874 B CN112459874 B CN 112459874B
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- urea
- cylinder body
- mixing
- plate
- flow
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 239000004202 carbamide Substances 0.000 title claims abstract description 82
- 239000011148 porous material Substances 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 abstract description 27
- 239000013078 crystal Substances 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 238000000197 pyrolysis Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 44
- 238000002425 crystallisation Methods 0.000 description 15
- 230000008025 crystallization Effects 0.000 description 15
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 235000017060 Arachis glabrata Nutrition 0.000 description 1
- 241001553178 Arachis glabrata Species 0.000 description 1
- 235000010777 Arachis hypogaea Nutrition 0.000 description 1
- 235000018262 Arachis monticola Nutrition 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 235000020232 peanut Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/06—Exhaust treating devices having provisions not otherwise provided for for improving exhaust evacuation or circulation, or reducing back-pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a mixing component of a urea mixing device, wherein a cylinder body is of an 8-shaped cylindrical structure formed by intersecting double circular pipes, and two communicated major arc cylindrical cavities are arranged in the cylinder body; a guide plate, a plurality of first pore plates and second pore plates are sequentially arranged in the cylinder body along the radial direction from top to bottom. Compared with a straight cylindrical mixing cylinder, the cylinder body of the invention occupies larger space between the front shell and the rear shell, and the air flow area of the cross section of the cylinder body is larger, namely, the space utilization rate is improved and the back pressure value is reduced in the effective cavity volume between the front shell and the rear shell; the urea liquid drops can obtain larger pyrolysis and mixing areas in the mixing cavity, so that the urea liquid drops can be fully pyrolyzed and mixed, urea crystals are prevented from being formed and accumulated, the conversion efficiency of NO x is ensured, the normal flow of tail gas is ensured, and the normal operation of an engine is ensured.
Description
Technical Field
The invention relates to the technical field of automobile exhaust aftertreatment, in particular to a mixing component of a urea mixing device.
Background
With the implementation of national six emission regulations, the national limits for engine emissions are becoming more stringent. At present, a diesel engine generally adopts a DOC (oxidation catalyst) +DPF (particulate filter) +SCR (selective catalytic reduction) technology to carry out aftertreatment on exhaust emission, wherein an SCR part is mainly formed by converting urea solution sprayed by a urea spraying system into ammonia (NH 3) at a certain temperature, mixing the ammonia with NO x (nitrogen oxide) in the tail gas of the diesel engine, and reducing the ammonia into nitrogen (N 2) and water (H 2 O) which have NO pollution to the atmosphere under the action of a catalyst.
The existing post-treatment urea mixer generally has the problems of poor uniformity of gas flow velocity distribution and lower space utilization rate; poor uniformity of gas flow velocity distribution can lead to uneven catalyst aging on the one hand; on the other hand, the temperature of the inner wall surface in the area with smaller gas flow velocity is lower in the tail gas aftertreatment and mixing device due to uneven gas flow velocity distribution, and when urea liquid drops contact the inner wall surface of the part, a part of heat is taken away, so that the temperature of the inner wall surface of the part is further reduced, urea liquid drops falling on the inner wall surface with excessively low temperature are easy to form urea crystals due to insufficient heat absorption and volatilization, and the conversion efficiency of aftertreatment is reduced; and the accumulation of urea crystals can also block the pipeline, influence the normal flow of engine tail gas of the engine, increase the back pressure of an exhaust system, and even further block the carrier surface of the SCR mixer, so that the aftertreatment is invalid and the normal operation of the engine is influenced. The low space utilization of the mixer can lead to a larger back pressure value of the mixer and larger loss of engine power.
Disclosure of Invention
The application provides a mixing component of a urea mixing device with reasonable structure, which aims at the defects of poor flow velocity distribution uniformity, low space utilization rate, large back pressure value and the like of the existing post-treatment urea mixer.
The technical scheme adopted by the invention is as follows:
The mixing component of the urea mixing device is characterized in that a cylinder body is of an 8-shaped cylindrical structure formed by intersecting double circular pipes, and two communicated major arc cylindrical cavities are formed in the cylinder body; a guide plate, a plurality of first pore plates and second pore plates are sequentially arranged in the cylinder body along the radial direction from top to bottom.
Compared with a straight cylindrical mixing cylinder, the cylinder body of the invention occupies larger space between the front shell and the rear shell, and the air flow area of the cross section of the cylinder body is larger, namely, the mixing cavity volume and the air flow area which are as large as possible are obtained through the 8-shaped structure in the effective cavity volume between the front shell and the rear shell, so that the space utilization rate is improved, and the back pressure value is reduced; the urea liquid drops can obtain larger pyrolysis and mixing areas in the mixing cavity, so that the urea liquid drops can be fully pyrolyzed and mixed, urea crystals are prevented from being formed and accumulated, the conversion efficiency of NO x is ensured, the normal flow of tail gas is ensured, and the normal operation of an engine is ensured.
As a further improvement of the above technical scheme:
The upper end of the cylinder body is provided with a first horn mouth, and the first horn mouth is large at the outside and small at the inside.
The first horn mouth of the cylinder body has a diversion effect on the tail gas flow entering the mixing cavity, so that the flow direction of the tail gas flow is changed smoothly, the uniformity of the flow speed of the flow is improved, the vortex effect is avoided, the generation of airflow noise is reduced, meanwhile, the flow area of the flow is reduced from large to small, the flow speed is increased rapidly after the flow enters from the first horn mouth, the mixing of the tail gas flow and urea liquid drops is facilitated, the urea liquid drops fully absorb heat and volatilize, and the formation of urea crystallization is avoided.
The guide plate is an arc plate.
The middle part of the upper edge of the guide plate is provided with a notch.
The notch is V-shaped.
The guide plate further guides the entering tail gas flow, so that the tail gas flow is turned to move to the front side for a certain distance, the uniformity of the flow speed of the tail gas flow is further improved, the moving path of the tail gas flow is further prolonged, the tail gas flow fully preheats all wall surfaces, urea drops fully absorb heat and volatilize, and urea crystallization is avoided, so that urea crystallization is avoided. The gap at the upper edge of the guide plate is positioned under the urea nozzle, and the gap is arranged in the middle of the guide plate because the airflow velocity and the temperature at the central part of the guide plate are slightly lower than those at other parts, so that the distance between the urea nozzle and the edge of the guide plate can be increased, and the risk of urea crystallization in a low-flow velocity and low-temperature region is reduced.
The first pore plate comprises plate faces on two sides and a plurality of bridge parts connected with the two plate faces, a plurality of first openings are formed between the two plate faces and each bridge part, and a plurality of first through holes are formed in the plate faces.
The two plate surfaces of the first pore plate are respectively positioned in the two major arc cylindrical cavities of the cylinder body, and a plurality of first openings are positioned in the middle part of the cylinder body.
The opening area of the first opening is larger than the opening area of the first through hole.
The second pore plate is provided with a plurality of second openings and second through holes; the opening area of the second opening is larger than the opening area of the second through hole.
The second opening is located directly under the first orifice plate face.
The first pore plate and the second pore plate are respectively provided with the openings with larger opening areas and the through holes with smaller opening areas, so that urea liquid drops sprayed by the urea nozzle are fully crushed, and meanwhile, the through holes have the overflow area as large as possible, thereby being beneficial to reducing air flow back pressure, ensuring normal flow of tail gas and ensuring normal operation of an engine.
The beneficial effects of the invention are as follows:
compared with a straight cylindrical mixing cylinder, the cylinder body of the invention occupies larger space between the front shell and the rear shell, and the air flow area of the cross section of the cylinder body is larger, namely, the mixing cavity volume and the air flow area which are as large as possible are obtained through the 8-shaped structure in the effective cavity volume between the front shell and the rear shell, so that the space utilization rate is improved, and the back pressure value is reduced; the urea liquid drops can obtain larger pyrolysis and mixing areas in the mixing cavity, so that the urea liquid drops can be fully pyrolyzed and mixed, urea crystals are prevented from being formed and accumulated, the conversion efficiency of NO x is ensured, the normal flow of tail gas is ensured, and the normal operation of an engine is ensured.
The first horn mouth of the cylinder body has a diversion effect on the tail gas flow entering the mixing cavity, so that the flow direction of the tail gas flow is changed smoothly, the uniformity of the flow speed of the flow is improved, the vortex effect is avoided, the generation of airflow noise is reduced, meanwhile, the flow area of the flow is reduced from large to small, the flow speed is increased rapidly after the flow enters from the first horn mouth, the mixing of the tail gas flow and urea liquid drops is facilitated, the urea liquid drops fully absorb heat and volatilize, and the formation of urea crystallization is avoided.
The guide plate further guides the entering tail gas flow, so that the tail gas flow is turned to move to the front side for a certain distance, the uniformity of the flow speed of the tail gas flow is further improved, the moving path of the tail gas flow is further prolonged, the tail gas flow fully preheats all wall surfaces, urea drops fully absorb heat and volatilize, and urea crystallization is avoided, so that urea crystallization is avoided. The gap at the upper edge of the guide plate is positioned under the urea nozzle, and the gap is arranged in the middle of the guide plate because the airflow velocity and the temperature at the central part of the guide plate are slightly lower than those at other parts, so that the distance between the urea nozzle and the edge of the guide plate can be increased, and the risk of urea crystallization in a low-flow velocity and low-temperature region is reduced.
The first pore plate and the second pore plate are respectively provided with the openings with larger opening areas and the through holes with smaller opening areas, so that urea liquid drops sprayed by the urea nozzle are fully crushed, and meanwhile, the through holes have the overflow area as large as possible, thereby being beneficial to reducing air flow back pressure, ensuring normal flow of tail gas and ensuring normal operation of an engine.
Drawings
Fig. 1 is a perspective view of a urea mixing apparatus employing the present invention.
Fig. 2 is an exploded view of fig. 1.
Fig. 3 is a longitudinal cross-sectional view of fig. 1 in the front-rear direction.
Fig. 4 is a perspective cutaway view of the present invention.
Fig. 5 is a perspective view of a baffle.
Fig. 6 is a perspective view of the first orifice plate.
Fig. 7 is a perspective view of the second orifice plate.
In the figure: 1. a front housing; 11. an air inlet; 12. an air outlet; 2. a rear housing; 21. a bevel plane; 3. a nozzle holder;
4. a mixing assembly; 41. a cylinder; 411. a first flare; 42. a deflector; 421. a notch; 43. a first orifice plate; 431. a panel surface portion; 432. a bridge portion; 433. a first through hole; 434. a first opening; 44. a second orifice plate; 441. a second opening; 442. a second through hole;
5. a baffle; 6. a partition plate; 7. a guide cylinder; 71. a second flare;
10. An air inlet cavity; 20. an air outlet cavity; 30. a mixing chamber.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
As shown in fig. 1,2 and 3, the cross section of the whole urea mixing device along the longitudinal axis is in the shape of a peanut shell, a front shell 1 of the urea mixing device is fixed on a rear shell 2, and an inner cavity is formed between the front shell 1 and the rear shell 2; the upper part of the front shell 1 is provided with a cylindrical air inlet 11, and the lower part is provided with a cylindrical air outlet 12; the semicircular baffle plate 5 is arranged on the upper portion of the air inlet 11, and after the tail gas air flow horizontally enters the inner cavity from the air inlet 11, the baffle plate 5 can turn to upwards move for a distance, so that the movement path of the tail gas air flow is prolonged when the air flow speed of the air inlet 11 is ensured to be uniform, the tail gas air flow fully preheats all wall surfaces, urea liquid drops dropped onto all wall surfaces fully absorb heat and volatilize, urea crystallization is avoided, and urea crystallization accumulation is avoided. As shown in fig. 3 and 4, a partition plate 6 is horizontally and horizontally arranged in the middle of the front shell 1 and the rear shell 2, the partition plate 6 is fixed on the wall surfaces of the front shell 1 and the rear shell 2 through welding, the partition plate 6 divides an internal cavity between the front shell 1 and the rear shell 2 into an upper air inlet cavity 10 and a lower air outlet cavity 20, the air inlet cavity 10 is communicated with an air inlet 11, and the air outlet cavity 20 is communicated with an air outlet 12; the center of the baffle plate 6 vertically passes through the mixing component 4 along the longitudinal direction, the inside of the mixing component 4 is a communicated mixing cavity 30, and the mixing cavity 30 is communicated with the air inlet cavity 10 and the air outlet cavity 20. The top end of the rear housing 2 is provided with a bevel plane 21, a nozzle seat 3 is arranged on the bevel plane 21 and opposite to the mixing assembly 4, a urea nozzle (not shown in the figure) is arranged in the nozzle seat 3, and urea droplets can be sprayed into the mixing assembly 4 by the urea nozzle.
As shown in fig. 3 and 4, the mixing assembly 4 includes a vertically arranged cylinder 41, the cylinder 41 is of an 8-shaped cylindrical structure formed by intersecting double circular pipes, a mixing cavity 30 is arranged in the cylinder 41, and two conducting major arc cylindrical cavities are formed, compared with a straight cylindrical mixing cylinder, the space occupied by the cylinder 41 between the front shell 1 and the rear shell 2 is larger, the air flow area of the cross section of the mixing assembly is larger, namely, the volume of the mixing cavity 30 and the air flow area which are as large as possible are obtained through the 8-shaped structure in the effective cavity volume between the front shell 1 and the rear shell 2, so that the space utilization rate is improved, and the back pressure value is reduced; the urea liquid drops can obtain larger pyrolysis and mixing areas in the mixing cavity 30, so that the urea liquid drops can be fully pyrolyzed and mixed, urea crystals are prevented from being formed and accumulated, the conversion efficiency of NO x is ensured, the normal flow of tail gas is ensured, and the normal operation of an engine is ensured. The upper end nozzle of barrel 41 is first horn mouth 411, and first horn mouth 411 is big outside and small inside, has a water conservancy diversion effect to the tail gas air current that gets into mixing chamber 30 for the tail gas air current changes flow direction steadily, is favorable to improving the homogeneity of air current velocity, avoids producing the vortex effect, reduces the production of air current noise, and the air current flow area's is from big to little reducing simultaneously, and the air current gets into the back from first horn mouth 411, and the velocity of flow rapidly increases, more does benefit to the mixture of tail gas air current and urea liquid drop, makes the abundant endothermic volatilization of urea liquid drop, avoids forming urea crystallization.
As shown in fig. 3 and 4, a baffle 42, a plurality of first orifice plates 43, and a plurality of second orifice plates 44 are radially arranged in the cylinder 41 in this order from top to bottom. As shown in fig. 4 and 5, the deflector 42 is an arc plate, and further guides the entering exhaust gas flow, so that the exhaust gas flow is turned to move to the front side for a certain distance, the uniformity of the flow speed of the exhaust gas flow is further improved, and meanwhile, the movement path of the exhaust gas flow is further prolonged, so that the exhaust gas flow fully preheats each wall surface, urea drops fully absorb heat and volatilize, and urea crystallization is avoided, and urea crystallization accumulation is further avoided; the middle part of the upper edge of the deflector 42 is provided with a V-shaped notch 421, the notch 421 is positioned under the nozzle seat 3, and as the airflow velocity and the temperature of the central part of the deflector 42 are slightly lower than those of other parts, the distance between the urea nozzle and the edge of the deflector 42 can be increased by providing the notch 421 in the middle part, and the risk of urea crystallization in the low-flow velocity and low-temperature region is reduced. The first orifice plate 43 includes plate surface portions 431 on two sides and a plurality of bridge portions 432 connecting the two plate surface portions 431, a plurality of first openings 434 are formed between the two plate surface portions 431 and each bridge portion 432, a plurality of first through holes 433 are formed in the plate surface portions 431, and the first openings 434 have larger opening areas relative to the first through holes 433; as shown in fig. 4, the two plate faces 431 of the first orifice plate 43 are respectively located in two major arc cylinder cavities with higher airflow velocity and temperature in the cylinder 41, and the plurality of first openings 434 are located in the middle part of the cylinder 41 with relatively lower airflow velocity and temperature. Second openings 441 with larger opening areas are respectively arranged on the second orifice plate 44 and under the plate surface 431 of the first orifice plate 43, and a plurality of second through holes 442 with smaller opening areas are also arranged on the second orifice plate 44 and outside the second openings 441. The first orifice plate 43 and the second orifice plate 44 are respectively provided with an opening (a first opening 434 and a second opening 441) with larger opening area and a plurality of through holes (a first through hole 433 and a second through hole 442) with smaller opening area, so that the urea liquid drops sprayed by the urea nozzle are fully crushed, and meanwhile, the flow passing area is as large as possible, the back pressure of air flow is reduced, the normal flow of tail gas is ensured, and the normal operation of an engine is ensured.
As shown in fig. 2 and 3, a guide cylinder 7 is fixedly arranged on the inner wall surface of the inclined plane 21 of the rear shell 2, the lower end part of the guide cylinder 7 stretches into the first horn mouth 411 of the cylinder 41, the guide cylinder 7 surrounds the periphery of the urea nozzle, and urea liquid drops sprayed by the urea nozzle can be guided to be totally sprayed into the mixing cavity 30 of the mixing assembly 4, so that urea crystals are prevented from being formed by the urea liquid drops splashing on the inner wall surfaces of the front shell 1 and the rear shell 2; the nozzle at the lower end part of the guide cylinder 7 is the second horn mouth 71 with large outside and small inside, can guide urea liquid drops to be sprayed towards the area with higher airflow velocity and temperature in the cylinder 41, is beneficial to reducing the risk of urea crystallization in a low-flow velocity and low-temperature area, ensures that the urea liquid drops can fully absorb heat and volatilize, ensures the conversion efficiency of NO x, ensures the normal flow of tail gas and ensures the normal operation of an engine.
In actual use, the urea nozzle in the nozzle seat 3 sprays urea liquid drops into the mixing assembly 4, the tail gas air flows into the air inlet cavity 10 from the air inlet 11, is accelerated into the mixing cavity 30 through the first horn mouth 411 of the cylinder 41 of the mixing assembly 4 to be mixed with the urea liquid drops, and the mixed tail gas air flows into the air outlet cavity 20 after being fully crushed and mixed through the plurality of first orifice plates 43 and the plurality of second orifice plates 44 in sequence and is discharged from the air outlet 12.
The cylinder 41 of the mixing assembly 4 adopts an 8 shape, so that the space utilization rate is improved, the back pressure value is reduced, urea liquid drops can be fully pyrolyzed and mixed in the mixing cavity 30, urea crystals are prevented from being formed and accumulated, the conversion efficiency of NO x is ensured, the normal flow of tail gas is ensured, and the normal operation of an engine is ensured.
The above description is illustrative of the invention and is not intended to be limiting, and the invention may be modified in any form without departing from the spirit of the invention.
Claims (2)
1. A mixing assembly for a urea mixing device, characterized by: the cylinder body (41) is of an 8-shaped cylindrical structure formed by intersecting double circular pipes, and two communicated major arc cylindrical cavities are formed in the cylinder body; a guide plate (42), a plurality of first pore plates (43) and second pore plates (44) are sequentially arranged in the cylinder body (41) along the radial direction from top to bottom; the guide plate (42) is an arc plate; a notch (421) is formed in the middle of the upper edge of the guide plate (42), and the notch (421) is V-shaped; the first pore plate (43) comprises plate surface parts (431) on two sides and a plurality of bridge parts (432) connected with the two plate surface parts (431), a plurality of first openings (434) are formed between the two plate surface parts (431) and each bridge part (432), and a plurality of first through holes (433) are formed in the plate surface parts (431); two plate faces (431) of the first orifice plate (43) are respectively positioned in two major arc cylindrical cavities of the cylinder body (41), and a plurality of first openings (434) are positioned in the middle part of the cylinder body (41); the opening area of the first opening (434) is larger than the opening area of the first through hole (433); a plurality of second openings (441) and second through holes (442) are formed in the second pore plate (44); the opening area of the second opening (441) is larger than the opening area of the second through hole (442); the second opening (441) is located directly below the plate surface (431) of the first orifice plate (43).
2. A mixing assembly of a urea mixing device according to claim 1, characterized in that: the upper end nozzle of the cylinder body (41) is a first horn mouth (411), and the first horn mouth (411) is large at the outside and small at the inside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011426317.3A CN112459874B (en) | 2020-12-09 | 2020-12-09 | Mixing assembly of urea mixing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011426317.3A CN112459874B (en) | 2020-12-09 | 2020-12-09 | Mixing assembly of urea mixing device |
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| Publication Number | Publication Date |
|---|---|
| CN112459874A CN112459874A (en) | 2021-03-09 |
| CN112459874B true CN112459874B (en) | 2024-06-18 |
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| CN202011426317.3A Active CN112459874B (en) | 2020-12-09 | 2020-12-09 | Mixing assembly of urea mixing device |
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| CN114151174B (en) * | 2021-11-22 | 2022-10-28 | 保定市屹马汽车配件制造有限公司 | SCR mixer of automobile exhaust system |
Citations (1)
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| JP2015212530A (en) * | 2014-05-07 | 2015-11-26 | 株式会社日本自動車部品総合研究所 | Injection device |
| CN107035480B (en) * | 2016-02-03 | 2019-08-09 | 天纳克（苏州）排放***有限公司 | Mixing chamber component |
| DE102017105093A1 (en) * | 2016-03-10 | 2017-09-14 | Friedrich Boysen Gmbh & Co. Kg | Mixer means |
| CN108104912A (en) * | 2016-11-25 | 2018-06-01 | 天纳克（苏州）排放***有限公司 | Tail-gas after treatment apparatus |
| CN107939488B (en) * | 2017-12-23 | 2020-03-17 | 无锡威孚力达催化净化器有限责任公司 | Urea mixing device for treating vehicle tail gas |
| CN208669387U (en) * | 2018-07-25 | 2019-03-29 | 佛吉亚排气控制技术开发(上海）有限公司 | Mixer and exhausted gas post-processing system |
| CN211008825U (en) * | 2019-12-19 | 2020-07-14 | 无锡亿利环保科技有限公司 | Urea aqueous solution decomposition mixing device |
| CN110925062A (en) * | 2019-12-19 | 2020-03-27 | 无锡亿利环保科技有限公司 | Urea mixer and post-treatment device |
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