CN115370450B - Urea mixing device suitable for large spray cone angle and U-shaped post-processor - Google Patents
Urea mixing device suitable for large spray cone angle and U-shaped post-processor Download PDFInfo
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- CN115370450B CN115370450B CN202211041965.6A CN202211041965A CN115370450B CN 115370450 B CN115370450 B CN 115370450B CN 202211041965 A CN202211041965 A CN 202211041965A CN 115370450 B CN115370450 B CN 115370450B
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- end cover
- urea
- rear end
- air inlet
- arc
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- 239000004202 carbamide Substances 0.000 title claims abstract description 134
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 238000002156 mixing Methods 0.000 title claims abstract description 96
- 239000007921 spray Substances 0.000 title claims abstract description 26
- 238000005192 partition Methods 0.000 claims description 86
- 230000007306 turnover Effects 0.000 claims description 22
- 238000000926 separation method Methods 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 15
- 239000007924 injection Substances 0.000 abstract description 15
- 239000000243 solution Substances 0.000 abstract description 13
- 238000002425 crystallisation Methods 0.000 abstract description 10
- 230000008025 crystallization Effects 0.000 abstract description 10
- 238000009825 accumulation Methods 0.000 abstract description 5
- 230000002028 premature Effects 0.000 abstract description 2
- 238000010926 purge Methods 0.000 description 6
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 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
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
-
- 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]
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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
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application provides a urea mixing device suitable for a large spray cone angle, which comprises a rear end cover, a front end cover, a urea mixing assembly and a urea rotational flow assembly, wherein the rear end cover is provided with a front end cover; the rear end cover is provided with an opening at one side, the inner part of the rear end cover is provided with a mixing space and a turbulent flow space which are connected, and a platform is arranged on the rear end cover and is used for being connected with a urea injection system so that urea solution is divergently injected into the mixing space at a taper angle of 35-45 degrees; the front end cover is connected to one side of the rear end cover; the front end cover is provided with a first opening and a second opening; the urea mixing assembly is arranged at the first opening and is used for guiding the air flow into the mixing space in a split manner; the urea cyclone component is arranged at the second opening and is used for guiding airflow cyclone out of the turbulent flow space. The application can avoid the premature collision and accumulation of urea on the front side and the rear side of the mixing device without increasing the size, and avoid the problems of urea crystallization, exceeding discharge standard and the like.
Description
Technical Field
The application relates to an aftertreatment system, in particular to a urea mixing device suitable for a large spray cone angle and a U-shaped aftertreatment device.
Background
At present, in the application technology of the SCR system, how to uniformly mix injected urea and engine exhaust gas and complete secondary crushing of urea, and reducing the crystallization risk of urea in a mixing device are key in the whole development process. The U-shaped post-processor is used as a key component of a post-treatment system of a commercial vehicle in a six-emission stage, and a urea mixing device of the U-shaped post-processor is still immature.
The matching of the urea mixing device and the urea injection system directly determines the degree of decomposition, mixing and crystallization risks of urea. The spray atomization cone angle of the common urea spray system in the market at present is 18-30 degrees, the maximum spray flow is 3.6-7.2 kg/h, and the spray pressure is mainly concentrated at 5bar, 6bar or 7bar.
Along with the gradual main stream of high-efficiency SCR post-treatment routes in the heavy commercial vehicle market, the requirement of the diesel engine of the heavy commercial vehicle on the maximum injection quantity of the urea injection system is gradually increased to 9 kg/h-13 kg/h, the urea injection system is gradually updated, the injection pressure is increased to 8bar or 9bar level, and the injection atomization cone angle of part of the urea injection system is increased to 35-45 degrees.
The urea mixing device of the existing postprocessor in the market cannot be suitable for a urea injection system with a large injection taper angle of a heavy commercial vehicle, and in the mixing device with the same size, urea solution sprayed by the urea injection system with the large injection taper angle can prematurely collide with walls and accumulate at the front side and the rear side of the mixing device, so that the problems of more urea crystallization, excessive emission and the like are caused.
Disclosure of Invention
Aiming at the defects existing in the prior art, the application provides the urea mixing device and the U-shaped post-processor suitable for the large spray cone angle, which can avoid the premature wall collision and accumulation of urea on the front side and the rear side of the mixing device and avoid the problems of urea crystallization, excessive discharge and the like under the condition of not increasing the size. The technical scheme adopted by the application is as follows:
in one aspect, the application provides a urea mixing device suitable for a large spray cone angle, which comprises a rear end cover, a front end cover, a urea mixing assembly and a urea cyclone assembly;
the rear end cover is provided with an opening at one side, the inner part of the rear end cover is provided with a mixing space and a turbulent flow space which are connected, and a platform is arranged on the rear end cover and is used for being connected with a urea injection system so that urea solution is divergently injected into the mixing space at a taper angle of 35-45 degrees;
the front end cover is connected to one side of the rear end cover; the front end cover is provided with a first opening and a second opening;
the urea mixing assembly is arranged at the first opening and is used for guiding the air flow into the mixing space in a split manner;
the urea cyclone component is arranged at the second opening and is used for guiding airflow cyclone out of the turbulent flow space.
Further, the urea mixing assembly comprises a main air inlet partition plate, an auxiliary air inlet partition plate and a baffle pipe;
the main air inlet partition plate is arranged at the first opening, and a main air inlet part is arranged on the main air inlet partition plate, so that a part of air flow enters one side in the mixing space from the main air inlet part;
the two ends of the auxiliary air inlet partition board are respectively connected with the rear end cover, one side of the auxiliary air inlet partition board is connected with the main air inlet partition board, and the other side of the auxiliary air inlet partition board extends towards the rear end cover so that a part of air flows to the other side in the mixing space by bypassing the auxiliary air inlet partition board;
one end of the baffle pipe is vertically connected with the auxiliary air inlet partition board, and the other end of the baffle pipe is connected with the rear end cover and corresponds to the platform.
Further, the auxiliary air inlet partition plate comprises a first partition surface and a second partition surface, one side of the first partition surface is connected with the main air inlet partition plate, the other end of the first partition surface extends towards the rear end cover, and the second partition surface is connected with the other side of the first partition surface;
wherein the included angle between the second separation surface and the other side of the rear end cover is omega;
the distance between the other end of the first separation surface and the other side of the rear end cover is L1, the distance between the other end of the second separation surface and the other side of the rear end cover is L2, and L2 is less than or equal to L1.
Further, the urea mixing assembly further comprises an arc-shaped crushing plate, one side of the arc-shaped crushing plate is connected with the main air inlet partition plate, the other side of the arc-shaped crushing plate extends to the rear end cover, and two ends of the arc-shaped crushing plate are respectively connected with the rear end cover;
the arc center of the arc-shaped crushing plate faces the mixing space and separates the mixing space from the turbulence space;
the arc-shaped crushing plate is provided with crushing blades so that air flows are concentrated in the middle of the turbulent flow space, and the included angle between the crushing blades and the arc surface of the arc-shaped crushing plate is theta.
Further, the main air inlet partition plate is also provided with
The first turnover fins are arranged at the downstream of the main air inlet part, and the first turnover fins are turned over from the main air inlet partition plate to the other side of the rear end cover in a way of alpha, wherein alpha is more than or equal to 15 degrees and less than or equal to 35 degrees;
the second turnover fin is arranged at the downstream of the first turnover fin, and the second turnover fin is turned over from the independent air inlet partition plate to the other side of the rear end cover in a way of < gamma >, wherein gamma is more than or equal to 10 degrees and less than or equal to 20 degrees.
Further, an arc groove is formed in the main air inlet partition plate, and the arc groove is located between the second turnover fin and the arc crushing plate; and/or the number of the groups of groups,
the other side of the arc-shaped crushing plate is provided with a long notch.
Further, the urea cyclone assembly comprises a supporting tube, the supporting tube is located in the second opening and is coaxially arranged, a plurality of spiral blades are uniformly distributed on the peripheral surface of the supporting tube, and the other ends of the spiral blades are connected to the front end cover.
The device comprises a rear end cover, a flow guide plate and a urea cyclone component, wherein the flow guide plate is arranged in a turbulent flow space and comprises a supporting part and a flow guide part;
the supporting part separates two diversion notches between the diversion part and the other side of the rear end cover.
Further, a nozzle base is arranged on the platform, a first flange is arranged at the front end of the first opening, and a second flange is arranged at the front end of the second opening.
On the other hand, the application also provides a U-shaped post-processor, which comprises a urea mixing device suitable for large spray cone angles, and further comprises a urea nozzle, a DPF purifier, a DOC component, an air inlet end cover, an SCR component, an air outlet end cover and an SCR purifier;
the urea nozzle is arranged at the platform of the rear end cover;
one end of the DPF purifier is arranged at the first opening;
the DOC component is arranged at the other end of the DPF purifier;
the air inlet end cover is arranged at the other end of the DOC component;
one end of the SCR component is arranged at the second opening;
the air outlet end cover is arranged at the other end of the SCR component;
the SCR purifier is arranged at the other end of the air outlet end cover.
The application has the advantages that:
the external shape and the space of the existing mixing device are utilized, the air flow is split under the condition that the size is not increased, the front and rear air inlet is realized, the multi-part air flow is fully purged, the phenomenon that urea solution collides with the wall and accumulates in the rear end cover too early under the large spray cone angle is avoided, the urea spraying device is suitable for a urea spraying system with a large spray cone angle, and the urea spraying device has high urea decomposition conversion efficiency, urea mixing uniformity and urea crystallization resistance.
Drawings
FIG. 1 is a schematic structural diagram of a urea mixing device according to the application.
Fig. 2 is a schematic structural view of a rear end cap in the urea mixing device of the present application.
Fig. 3 is a schematic structural view of a front end cover in the urea mixing device of the present application.
FIG. 4 is a schematic structural diagram of a urea mixing assembly in a urea mixing device according to the application.
Fig. 5 is a side view of the urea mixing device of the application.
FIG. 6 is a schematic view of the structure of an arc-shaped breaker plate in the urea mixing apparatus of the present application.
FIG. 7 is a radial cross-sectional view of an arcuate breaker plate in a urea mixing apparatus in accordance with the present application.
FIG. 8 is a side view of the main intake partition of the urea mixing apparatus of the present application.
FIG. 9 is a schematic diagram of the urea cyclone assembly in the urea mixing device of the present application.
FIG. 10 is a schematic view of the structure of a baffle in the urea mixing device of the present application.
FIG. 11 is a schematic diagram of a U-type post-processor according to the present application.
In the figure: the device comprises a 1-rear end cover, a 2-front end cover, a 3-urea mixing component, a 4-urea rotational flow component, a 5-deflector, a 6-nozzle base, a 7-first flange, an 8-second flange, a 101-mixing space, a 102-second flange, a 103-platform, a 201-first opening, a 202-second opening, a 301-main air inlet baffle, a 3011-main air inlet part, a 3012-first turnover fin, a 3013-second turnover fin, a 3014-arc-shaped groove, a 302-auxiliary air inlet baffle, a 3021-first separation surface, a 3022-second separation surface, a 303-baffle pipe, a 304-arc-shaped crushing plate, a 3041-crushing blade, a 3042-long notch, a 401-support pipe, a 402-spiral blade, a 501-support part, a 502-baffle part, a 503-baffle notch, a 10-urea mixing device, a 20-urea nozzle, a 30-DPF purifier, a 40-DOC component, a 50-air inlet end cover, a 60-SCR component, a 70-air outlet end cover, an 80-SCR purifier, and 90-clamp.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The application provides a urea mixing device 10 suitable for large spray cone angles, which comprises a rear end cover 1, a front end cover 2, a urea mixing component 3 and a urea cyclone component 4; the rear end cover 1 is provided with an opening at one side, the inner part of the rear end cover is provided with a mixing space 101 and a turbulent flow space 102 which are connected, a platform 103 is arranged on the rear end cover, and the platform 103 is used for connecting a urea injection system so that urea solution is divergently injected into the mixing space 101 at a taper angle of 35-45 degrees; the front end cover 2 is connected to one side of the rear end cover 1; the front end cover 2 is provided with a first opening 201 and a second opening 202; the urea mixing assembly 3 is arranged at the first opening 201 for diverting the gas flow into the mixing space 101; the urea cyclone assembly 4 is arranged at the second opening 202 for guiding the airflow cyclone out of the turbulent space 102.
Specifically, referring to fig. 1-3, the rear end cover 1 and the front end cover 2 are both in the existing shape and size, the mixing space 101 and the turbulence space 102 are arranged up and down, the platform 103 is arranged at the top of the rear end cover 1, and an opening for spraying urea solution is arranged in the middle of the platform 103, so that the urea solution is sprayed into the mixing space 101 in a divergent manner with a cone angle of 35 ° -45 °; the front end cover 2 is fixed on the front side of the rear end cover 1, and the first opening 201 and the second opening 202 are all round; under the condition of not increasing the size, the urea mixing assembly 3 divides the airflow, realizes front and back simultaneous air intake, and avoids the phenomenon that urea solution collides with the wall and accumulates at the front and back sides of the rear end cover too early under the large spray cone angle.
In the present application, the urea mixing assembly 3 includes a main intake partition 301, a sub intake partition 302, and a baffle 303; the main air inlet partition 301 is arranged at the first opening 201, and a main air inlet 3011 is arranged on the main air inlet partition 301, so that a part of air flow enters one side in the mixing space 101 from the main air inlet 3011; two ends of the auxiliary air inlet partition plate 302 are respectively connected with the rear end cover 1, one side of the auxiliary air inlet partition plate 302 is connected with the main air inlet partition plate 301, and the other side of the auxiliary air inlet partition plate 302 extends towards the rear end cover 1, so that a part of air flows to the other side in the mixing space 101 by bypassing the auxiliary air inlet partition plate 302; one end of the baffle 303 is vertically connected to the auxiliary air inlet partition 302, and the other end thereof is connected to the rear end cover 1 and corresponds to the platform 103.
Specifically, referring to fig. 4, the main intake partition 301 and the baffle 303 are vertically disposed, the auxiliary intake partition 302 is horizontally disposed, and a part of the auxiliary intake airflow is subdivided into two parts from the top of the main intake partition 301 through the baffle 303 and then merges, and flows around the auxiliary intake partition 302 to the rear side of the mixing space 101; a part of the main intake air flow flows from the main intake portion 3011 on the main intake partition 301 toward the front side of the mixing space 101; by purging the front side and the rear side of the mixing space 101 respectively, the urea solution is prevented from adhering to the inner wall of the rear end cover 1 and the rear side surface of the main air inlet partition 301 too early, accumulating and forming crystals due to overlarge spray cone angles;
the baffle 303 is located in the middle of the auxiliary air inlet partition 302, so that the air flow rates at the left side and the right side of the air inlet partition 302 are the same, and the air flow uniformity is improved.
As an embodiment of the present application, the number of the main intake portions 3011 is two, and the shape thereof is substantially triangular, and the main intake air flow and the sub-intake air flow are symmetrically arranged on the main intake partition 301 in the left-right direction so as to form a pair.
In the present application, the auxiliary air intake partition 302 includes a first partition surface 3021 and a second partition surface 3022, wherein one side of the first partition surface 3021 is connected to the main air intake partition 301, the other end of the first partition surface 3021 extends toward the rear end cover 1, and the second partition surface 3022 is connected to the other side of the first partition surface 3021; wherein, the included angle between the second partition surface 3022 and the other side of the rear end cap 1 is ω; the distance between the other end of the first partition surface 3011 and the other side of the rear end cover 1 is L1, the distance between the other end of the second partition surface 3022 and the other side of the rear end cover 1 is L2, and L2 is less than or equal to L1.
Specifically, referring to fig. 4 and 5, the second partition surface 3022 is turned over from the horizontal direction to the vertical direction and ω is equal to or smaller than 90 °, and by changing the angle ω, the distance L1, and the distance L2, the magnitude and intensity of the airflow from the rear side of the mixing space 101 are adjusted, the purge direction is controlled, and urea accumulation on the rear side wall in the rear end cap 1 is reduced.
In the application, the urea mixing assembly 3 further comprises an arc-shaped crushing plate 304, one side of the arc-shaped crushing plate 304 is connected with the main air inlet partition 301, the other side of the arc-shaped crushing plate extends to the rear end cover 1, and two ends of the arc-shaped crushing plate 304 are respectively connected with the rear end cover 1; the arc center of the arc-shaped crushing plate 304 faces the mixing space 101 and separates the mixing space 101 from the turbulence space 102; the arc-shaped crushing plate 304 is provided with a crushing blade 3041, so that the air flow is concentrated in the middle of the turbulence space 102, and the included angle between the crushing blade 3041 and the arc surface of the arc-shaped crushing plate 304 is θ.
Specifically, referring to fig. 5-7, the arc center of the arc-shaped crushing plate 304 is upward, and the left end, the right end and the rear end of the arc-shaped crushing plate are welded and fixed with the rear end cover 1; the number of the crushing blades 3041 is two, and the crushing blades are symmetrically arranged on the arc-shaped crushing plate 304; each group of crushing blades 3041 is divided into four rows and ten lines, each crushing blade 3041 is turned over downwards from the cambered surface of the arc-shaped crushing plate 304 to form a angle theta, and the secondary crushing of urea particles is effectively promoted through a specific number of crushing blades 3041 and a specific angle theta, so that urea decomposition is accelerated, the arc centers of the arc-shaped crushing plates 304 are upward, the air flows at the left side and the right side can be promoted to be converged towards the middle part of the arc-shaped crushing plates 304, and after the air flow strength of the middle part is improved, urea can be further prevented from being accumulated on the arc-shaped crushing plates 304.
As an example of the present application, 10 DEG < θ < 30 DEG; specifically, 18 degrees, 20 degrees, 24 degrees and 28 degrees can be selected; too small angle theta can lead to the fact that the air flows at the left side and the right side are contacted with the arc-shaped crushing plate 304 or are stored in the middle of the outer cambered surface of the arc-shaped crushing plate 304 before being converged, urea crystallization is caused, too large angle theta can lead to the fact that the air flows at the left side and the right side are converged too late, and the air flows are discharged out of the turbulent flow space 102 without being uniformly mixed, so that the urea mixing efficiency is reduced.
In the present application, the main air intake partition 301 is further provided with a first turnover fin 3012 and a second turnover fin 3013; the first turnover fins 3012 are arranged at the downstream of the main air inlet part 3011, and the first turnover fins 3012 are turned over from the main air inlet partition 301 to the other side of the rear end cover 1 under the angle alpha, wherein the angle alpha is more than or equal to 15 degrees and less than or equal to 35 degrees; the second turndown fin 3013 is arranged at the downstream of the first turndown fin 3012, and the second turndown fin 3013 is turned over from the main air inlet partition 301 to the other side of the rear end cover 1 by < gamma >, wherein, gamma is more than or equal to 10 degrees and less than or equal to 20 degrees.
Specifically, referring to fig. 8, the first turning fins 3012 are located at the lower side of the main air inlet portion 3011 and are equidistantly arranged in three rows from top to bottom, the first turning fins 3012 are in a strip structure extending from left to right, the second turning fins 3013 are located at the lower side of the first turning fins 3012 and are equidistantly arranged in two rows from top to bottom, the second turning fins 3013 are in a strip structure extending from left to right in groups, and the second turning fins 3013 are shorter than the first turning fins 3012; the first turnover fins 3012 mainly guide air flow to blow to the arc-shaped crushing plate 304 to play a role in guiding the air flow, and the second turnover fins 3013 mainly purge urea on the lower end of the main air inlet partition 301 to collide with the wall, so that urea decomposition is accelerated, urea crystallization is comprehensively prevented, and the urea collision prevention performance of the urea mixing device 10 is comprehensively improved.
As an embodiment of the application, gamma is less than or equal to alpha; the range of alpha is more than or equal to 20 degrees and less than or equal to 30 degrees, and gamma is more than or equal to 12 degrees and less than or equal to 18 degrees; alpha is more than or equal to 22 degrees and less than or equal to 28 degrees, gamma is more than or equal to 14 degrees and less than or equal to 16 degrees or 24 degrees and less than or equal to 26 degrees, and gamma=15 degrees; depending on the position of the second turndown fin 3013, the lower end of the air inlet baffle 301 is purged more than the first turndown fin 3014, but when gamma is more than alpha, the situation that the air flow entering from the first turndown fin 3012 collides with the air flow entering from the second turndown fin 3013 can occur, and the urea mixing effect and the purging effect are affected;
in addition, the gas flow velocity requirements of different aftertreatment systems can be met by controlling the angle of gamma and alpha and controlling the direction and intensity of gas flow purging.
In the application, an arc-shaped groove 3014 is arranged on the main air inlet partition 301, and the arc-shaped groove 3014 is positioned between the second turnover fin 3013 and the arc-shaped crushing plate 304;
specifically, referring to fig. 4, the arc center of the arc-shaped slot 3014 is upward and located below the second turndown fin 3013, and the lower end of the arc-shaped slot is aligned with the inner arc surface of the arc-shaped crushing plate 304; a small portion of the air flow is blown through the arc chute 3014 towards the inner surface of the arc breaker plate 304, effectively preventing urea from accumulating and crystallizing at the junction of the main air intake partition 301 and the arc breaker blades 304.
The other side of the arc-shaped crushing plate 304 is provided with a long slot 3042; specifically, referring to fig. 4 or 6, the long slot 3042 is located at the rear side of the arc-shaped crushing plate 304 and is attached to the rear side wall of the rear end cover 1; the long slot 3042 can purge the secondary air flow led in by the secondary air inlet partition 302 to the turbulent space 102 along the avoiding surface of the rear side wall of the rear end cover 1, so as to effectively reduce the accumulation of urea on the wall surface of the rear end cover 1.
In the application, the urea cyclone assembly 4 comprises a support pipe 401, wherein the support pipe 401 is positioned in the second opening 202 and is coaxially arranged, a plurality of spiral blades 402 are uniformly distributed on the peripheral surface of the support pipe 401, and the other ends of the spiral blades 402 are connected with the front end cover 2.
Specifically, referring to fig. 9, the support tube 401 is a short tube, a part of air flow can pass through, the spiral blades 402 are 8, so that the whole urea cyclone assembly 4 is divided into 9 diversion parts, and the 9 diversion parts flow out from gaps among the 8 spiral blades 402 and the support tube 401 respectively, thereby ensuring the efficiency of decomposing urea into ammonia gas and the uniformity of ammonia distribution in the front end of the SCR catalyst.
The application further comprises a deflector 5, which is arranged in the turbulent flow space 102 and comprises a supporting part 501 and a deflector part 502, wherein the supporting part 501 is arranged on the other side of the rear end cover 1 in a bonding way, two ends of the deflector part 502 are respectively connected with the rear end cover 1, and the deflector part 502 is folded from one side of the supporting part 501 to the second opening 202 and is used for guiding air flow to the urea cyclone component 4; the supporting portion 501 separates two diversion notches 503 between the diversion portion 502 and the other side of the rear end cover 1.
Specifically, referring to fig. 5 and 10, the supporting portion 501 is welded and fixed on the rear sidewall of the rear end cover 1, and the guiding portion 502 is located at the lower side of the supporting tube 401 and turned forward, so that the guiding portion 502 guides the air flow out of the turbulent flow space 102 as soon as possible, and prevents urea from crystallizing at the guiding portion 502; the diversion notches 503 disperse a small part of the airflow, and form airflow interference at the joint of the supporting part 501 and the diversion part 502, so as to avoid crystallization of urea at the joint of the supporting part 501 and the diversion part 502.
In the present application, referring to fig. 1, the platform 103 is provided with a nozzle base 6, a first flange 7 is disposed at a front end of the first opening 201, and a second flange 8 is disposed at a front end of the second opening 202.
On the other hand, referring to fig. 11, the present application further proposes a U-shaped post-processor, which includes a urea mixing device 10 adapted for large spray cone angle, and further includes a urea nozzle 20, a DPF purifier 30, a DOC assembly 40, an air inlet end cover 50, an SCR assembly 60, an air outlet end cover 70, and an SCR purifier 80; the urea nozzle 20 is arranged at the platform 103 of the rear end cover 1; one end of the DPF purifier 30 is disposed at the first opening 201; the DOC assembly 40 is arranged at the other end of the DPF purifier 30; the air inlet end cover 50 is arranged at the other end of the DOC component 40; one end of the SCR assembly 60 is disposed at the second opening 202; the air outlet end cover 70 is arranged at the other end of the SCR assembly 60; the SCR purifier 80 is arranged at the other end of the air outlet end cover 70;
specifically, the DPF purifier 30 is connected to the first flange 7, the DPF purifier 30 is fixed to the DOC assembly 40 and the first flange 7 through the clips 90, the SCR assembly 60 is connected to the second flange 8, and the first flange 7 is fixed to the second flange 8 through the clips 90.
The following briefly describes the mixing process of the urea mixing device 10 according to fig. 5:
the air flow enters the mixing space 101 from the first opening 201 in five parts, the first part of air flow enters the mixing space 101 from the main air inlet part 3011 to be mixed with urea sprayed at a large cone angle, the second part of air flow bypasses the auxiliary air inlet baffle 302 and the baffle 303 to flow along the rear side wall of the rear end cover 1 and then to be mixed with urea, the mixed air flow flows to the arc-shaped crushing plate 304, the third part of air flow enters the mixing space from the first turning fin 3012 to be guided to blow the air flow to the arc-shaped crushing plate 304, the fourth part of air flow enters the mixing space 101 from the second turning fin 3013 to blow urea on the lower side wall of the rear side wall of the main air inlet baffle 301, and the fifth part of air flow is blown to the joint of the main air inlet baffle 301 and the arc-shaped crushing plate 304 from the arc-shaped groove 3014; the air flow passes through the arc-shaped crushing plate 304 after being mixed with urea, is guided into the turbulent flow space 102 by the shapes of the crushing blades 3041 and the arc-shaped crushing plate 304 and is converged in the middle part of the turbulent flow space 102, is guided by the flow guiding part 502, is blown to the urea cyclone assembly 4, and is spirally and uniformly flowed to the SCR assembly 60 under the action of the supporting tube 401 and the spiral blades 402.
In summary, the airflow enters the rear end cover 1 from different positions and angles and is fully mixed with urea, so that the application is not only suitable for large-cone-angle urea injection, but also can avoid urea accumulation and crystallization, and improves the mixing uniformity.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present application, and not for limiting the same, and although the present application has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present application.
Claims (7)
1. Urea mixing device (10) suitable for large spray cone angles, characterized in that: comprises a rear end cover (1), a front end cover (2), a urea mixing component (3) and a urea cyclone component (4);
the urea spraying device is characterized in that one side of the rear end cover (1) is provided with an opening, the inner part of the rear end cover is provided with a mixing space (101) and a turbulence space (102) which are connected, the rear end cover is provided with a platform (103), and the platform (103) is used for being connected with a urea spraying system so that urea solution is sprayed into the mixing space (101) in a divergent manner at a cone angle of 35-45 degrees;
the front end cover (2) is connected to one side of the rear end cover (1); the front end cover (2) is provided with a first opening (201) and a second opening (202); the urea mixing assembly (3) is arranged at the first opening (201) for diverting the gas flow into the mixing space (101); the urea cyclone assembly (4) is arranged at the second opening (202) and is used for guiding airflow cyclone out of the turbulent flow space (102);
the urea mixing assembly (3) comprises a main air inlet partition plate (301), a secondary air inlet partition plate (302) and a baffle pipe (303);
the main air inlet partition board (301) is arranged at the first opening (201), and a main air inlet part (3011) is arranged on the main air inlet partition board (301) so that a part of air flow enters one side in the mixing space (101) from the main air inlet part (3011);
two ends of the auxiliary air inlet partition board (302) are respectively connected with the rear end cover (1), one side of the auxiliary air inlet partition board (302) is connected with the main air inlet partition board (301), and the other side of the auxiliary air inlet partition board (302) extends towards the rear end cover (1) so that a part of air flow bypasses the auxiliary air inlet partition board (302) to flow to the other side in the mixing space (101);
one end of the baffle pipe (303) is vertically connected with the auxiliary air inlet partition plate (302), and the other end of the baffle pipe is connected with the rear end cover (1) and corresponds to the platform (103);
the auxiliary air inlet partition plate (302) comprises a first partition surface (3021) and a second partition surface (3022), one side of the first partition surface (3021) is connected to the main air inlet partition plate (301), the other side of the first partition surface extends towards the rear end cover (1), and the second partition surface (3022) is connected to the other side of the first partition surface (3021);
wherein the included angle between the second separation surface (3022) and the other side of the rear end cover (1) is omega;
the distance between the other side of the first separation surface (3021) and the other side of the rear end cover (1) is L1, the distance between the other end of the second separation surface (3022) and the other side of the rear end cover (1) is L2, and L2 is less than or equal to L1;
the main air inlet partition board (301) is also provided with
The first turnover fins (3012) are arranged at the lower side of the main air inlet part (3011), and the first turnover fins (3012) are turned over from the main air inlet partition plate (301) to the other side of the rear end cover (1) at an angle alpha, wherein alpha is more than or equal to 15 degrees and less than or equal to 35 degrees;
the second turnover fin (3013), the second turnover fin (3013) is arranged at the lower side of the first turnover fin (3012), and the second turnover fin (3013) is turned over from the independent air inlet partition plate (301) to the other side of the rear end cover (1) and is less than or equal to 10 degrees and less than or equal to 20 degrees.
2. The urea mixing device adapted for large spray cone angles as claimed in claim 1, wherein: the urea mixing assembly (3) further comprises an arc-shaped crushing plate (304), one side of the arc-shaped crushing plate (304) is connected to the main air inlet partition plate (301), the other side of the arc-shaped crushing plate extends to the rear end cover (1), and two ends of the arc-shaped crushing plate (304) are respectively connected with the rear end cover (1);
the arc center of the arc-shaped crushing plate (304) faces the mixing space (101) and separates the mixing space (101) from the turbulence space (102);
the arc-shaped crushing plate (304) is provided with crushing blades (3041) so that air flows are concentrated in the middle of the turbulence space (102), and the included angle between each crushing blade (3041) and the arc surface of the arc-shaped crushing plate (304) is theta.
3. Urea mixing device suitable for large spray cone angles according to claim 2, characterized in that: an arc groove (3014) is formed in the main air inlet partition plate (301), and the arc groove (3014) is located between the second turnover fin (3013) and the arc crushing plate (304); and/or the number of the groups of groups,
the other side of the arc-shaped crushing plate (304) is provided with a long notch (3042).
4. The urea mixing device adapted for large spray cone angles as claimed in claim 1, wherein: the urea cyclone assembly (4) comprises a supporting tube (401), the supporting tube (401) is located in the second opening (202) and is coaxially arranged, a plurality of spiral blades (402) are uniformly distributed on the peripheral surface of the supporting tube (401), and the other ends of the spiral blades (402) are connected to the front end cover (2).
5. The urea mixing device suitable for large spray cone angles as claimed in claim 4, wherein: the device comprises a rear end cover (1), a flow guide plate (5), a supporting part (501) and a flow guide part (502), wherein the flow guide plate (5) is arranged in a turbulent flow space (102), the supporting part (501) is arranged on the other side of the rear end cover (1) in a fitting mode, two ends of the flow guide part (502) are respectively connected with the rear end cover (1), and the flow guide part (502) is folded from one side of the supporting part (501) to a second opening (202) and used for guiding air flow to a urea cyclone component (4);
the supporting part (501) separates two diversion notches (503) between the diversion part (502) and the other side of the rear end cover (1).
6. The urea mixing device adapted for large spray cone angles as claimed in claim 1, wherein: the novel spray nozzle is characterized in that a spray nozzle base (6) is arranged on the platform (103), a first flange (7) is arranged at the front end of the first opening (201), and a second flange (8) is arranged at the front end of the second opening (202).
7. A U-shaped post-processor, characterized in that: comprising a urea mixing device (10) according to any of claims 1-6 adapted for large spray cone angles, further comprising a urea nozzle (20), a DPF purifier (30), a DOC assembly (40), an inlet end cap (50), an SCR assembly (60), an outlet end cap (70), an SCR purifier (80);
the urea nozzle (20) is arranged at a platform (103) of the rear end cover (1);
one end of the DPF purifier (30) is arranged at the first opening (201);
the DOC component (40) is arranged at the other end of the DPF purifier (30);
the air inlet end cover (50) is arranged at the other end of the DOC component (40);
one end of the SCR assembly (60) is arranged at the second opening (202);
the air outlet end cover (70) is arranged at the other end of the SCR component (60);
the SCR purifier (80) is arranged at the other end of the air outlet end cover (70).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211041965.6A CN115370450B (en) | 2022-08-29 | 2022-08-29 | Urea mixing device suitable for large spray cone angle and U-shaped post-processor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211041965.6A CN115370450B (en) | 2022-08-29 | 2022-08-29 | Urea mixing device suitable for large spray cone angle and U-shaped post-processor |
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| CN115370450B true CN115370450B (en) | 2023-12-01 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008046222A1 (en) * | 2008-09-08 | 2010-04-08 | J. Eberspächer GmbH & Co. KG | exhaust treatment device |
| DE102017222785A1 (en) * | 2017-10-18 | 2019-04-18 | Hyundai Motor Company | Harnstofflösungseinfüllstutzeneinrichtung |
| CN209990526U (en) * | 2019-06-04 | 2020-01-24 | 无锡威孚力达催化净化器有限责任公司 | Compact U-shaped cylinder type post-processing platform |
| CN212054866U (en) * | 2020-04-20 | 2020-12-01 | 罗伯特·博世有限公司 | Tail gas aftertreatment system |
| CN112012814A (en) * | 2020-08-18 | 2020-12-01 | 无锡威孚力达催化净化器有限责任公司 | Mixing device for spraying upper end of U-shaped end cover |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019117459A1 (en) * | 2019-06-28 | 2020-12-31 | Eberspächer Exhaust Technology GmbH & Co. KG | mixer |
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- 2022-08-29 CN CN202211041965.6A patent/CN115370450B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008046222A1 (en) * | 2008-09-08 | 2010-04-08 | J. Eberspächer GmbH & Co. KG | exhaust treatment device |
| DE102017222785A1 (en) * | 2017-10-18 | 2019-04-18 | Hyundai Motor Company | Harnstofflösungseinfüllstutzeneinrichtung |
| CN209990526U (en) * | 2019-06-04 | 2020-01-24 | 无锡威孚力达催化净化器有限责任公司 | Compact U-shaped cylinder type post-processing platform |
| CN212054866U (en) * | 2020-04-20 | 2020-12-01 | 罗伯特·博世有限公司 | Tail gas aftertreatment system |
| CN112012814A (en) * | 2020-08-18 | 2020-12-01 | 无锡威孚力达催化净化器有限责任公司 | Mixing device for spraying upper end of U-shaped end cover |
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