CN116677482A - Mixer assembly and exhaust aftertreatment package - Google Patents

Mixer assembly and exhaust aftertreatment package Download PDF

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Publication number
CN116677482A
CN116677482A CN202310894271.5A CN202310894271A CN116677482A CN 116677482 A CN116677482 A CN 116677482A CN 202310894271 A CN202310894271 A CN 202310894271A CN 116677482 A CN116677482 A CN 116677482A
Authority
CN
China
Prior art keywords
plate
arc
mixer assembly
shaped protruding
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310894271.5A
Other languages
Chinese (zh)
Inventor
严才宝
裘莎莎
秦雨松
李硕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tenneco Suzhou Emission System Co Ltd
Original Assignee
Tenneco Suzhou Emission System Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tenneco Suzhou Emission System Co Ltd filed Critical Tenneco Suzhou Emission System Co Ltd
Priority to CN202310894271.5A priority Critical patent/CN116677482A/en
Publication of CN116677482A publication Critical patent/CN116677482A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F01N3/24—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
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • 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
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • 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

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

A mixer assembly includes a housing, a first plate, a second plate, and a third plate. The first plate includes a blocking portion and a partition portion. The mixer assembly includes an inlet cavity, an outlet cavity, and a mixing cavity. The shell comprises a urea nozzle seat for installing a urea nozzle and a porous pipe which is fixed on the inner wall of the shell and corresponds to the urea nozzle seat, wherein the porous pipe is provided with a plurality of perforations distributed along the circumferential direction of the porous pipe. The plurality of perforations are configured to allow an air flow to pass through to the urea nozzle holder, thereby increasing the urea crystallization resistance of the urea nozzle holder. The invention also discloses an exhaust aftertreatment package with the mixer assembly.

Description

Mixer assembly and exhaust aftertreatment package
Technical Field
The invention relates to a mixer assembly and exhaust gas aftertreatment packaging, and belongs to the technical field of engine exhaust gas aftertreatment.
Background
With the continuous upgrading of emission regulations, higher demands are being placed on the concentration of harmful substances in the engine exhaust. In order to reduce the concentration of harmful substances, the exhaust gas aftertreatment system correspondingly increases the injection quantity of urea. However, the risk of urea crystallization with increasing urea injection increases.
However, the technical solution in the related art still has room for improvement.
Disclosure of Invention
The invention aims to provide a mixer assembly with good urea crystallization resistance and an exhaust gas aftertreatment package.
In order to achieve the above purpose, the invention adopts the following technical scheme: a mixer assembly, comprising: the device comprises a shell, a first plate, a second plate and a third plate, wherein the first plate is positioned in the shell, the second plate is positioned at the downstream of the first plate in the airflow flowing direction, the third plate is positioned at the downstream of the second plate in the airflow flowing direction, the first plate comprises a blocking part and a separating part connected with the blocking part, the mixer assembly comprises an air inlet cavity, an air outlet cavity and a mixing cavity communicated with the air inlet cavity and the air outlet cavity, the air inlet cavity, the mixing cavity and the air outlet cavity are used for allowing exhaust gas to circulate, the mixing cavity and the air inlet cavity are positioned at two sides of the separating part, and the separating part comprises communication holes communicated with the air inlet cavity and the mixing cavity; the shell comprises a urea nozzle seat for installing a urea nozzle and a porous pipe which is fixed on the inner wall of the shell and corresponds to the urea nozzle seat, the porous pipe is positioned in the mixing cavity, and the porous pipe is provided with a plurality of perforations distributed along the circumferential direction of the porous pipe; the urea nozzle is used for injecting urea liquid drops into the mixing cavity, so that the tail gas entering the mixing cavity and the urea liquid drops mutually collide and are mixed in the mixing cavity; the plurality of perforations are configured to allow the flow of air to pass through to the urea nozzle holder; the second plate is provided with a first fixing part fixed on the inner wall of the shell and a first arc-shaped protruding part protruding forwards from the middle part of the first fixing part and extending into the mixing cavity, and the first arc-shaped protruding part is provided with a plurality of first airflow perforations; the second plate is provided with a first concave space positioned behind the first arc-shaped convex part; the third plate is provided with a second fixing part fixed on the inner wall of the shell and a second arc-shaped protruding part protruding from the middle part of the second fixing part to at least partially extend into the first concave space, and the second arc-shaped protruding part is provided with a plurality of second airflow perforations.
As a further improved technical solution of the present invention, the blocking portion extends in a vertical direction, and the partition portion extends in a horizontal direction.
As a further improved technical scheme of the invention, the first fixing part is provided with a first slot, and the first arc-shaped protruding part is provided with a second slot;
the partition is provided with a first tab inserted into the first slot and a second tab inserted into the second slot.
As a further improved technical scheme of the invention, the partition part is provided with a first arc-shaped groove which is fit with the shape of the first arc-shaped protruding part, and the second lug protrudes into the first arc-shaped groove.
As a further improved technical solution of the present invention, the mixer assembly includes an arc-shaped cavity between the first arc-shaped protrusion and the second arc-shaped protrusion; the first arc-shaped protruding portion stretches across the second plate in the vertical direction, and the first fixing portion is located on two sides of the first arc-shaped protruding portion.
As a further improved technical scheme of the invention, the second arc-shaped protruding portion does not cross the third plate along the vertical direction, and the second fixing portion is located around the second arc-shaped protruding portion.
As a further improved technical scheme of the invention, the first fixing part is provided with a plurality of first airflow through holes; the second fixing part is provided with a plurality of second airflow through holes.
As a further improved technical scheme of the invention, the second arc-shaped protruding part is punched from the middle part of the third plate, and the third plate is provided with a first tearing opening corresponding to the upper edge of the second arc-shaped protruding part and a second tearing opening corresponding to the lower edge of the second arc-shaped protruding part.
As a further improved technical scheme of the invention, the length of the first arc-shaped protruding part along the vertical direction is longer than the length of the second arc-shaped protruding part along the vertical direction.
As a further improved technical scheme of the invention, the urea nozzle seat is a solid nozzle seat.
As a further improved technical scheme of the invention, the mixer assembly further comprises a swirl plate positioned downstream of the third plate along the airflow flowing direction, wherein the swirl plate comprises a body part fixed on the inner wall of the shell, a plurality of swirl plates punched from the body part and grooves corresponding to each swirl plate; the body part and/or the cyclone sheet is/are provided with an airflow through hole penetrating through.
The invention also discloses an exhaust gas aftertreatment package, which comprises a diesel oxidation catalyst component, a diesel particle catcher component, a mixer component and a selective catalytic reducer component, wherein the diesel particle catcher component is positioned at the downstream of the diesel oxidation catalyst component and is connected with the diesel oxidation catalyst component, the mixer component is positioned at the downstream of the diesel particle catcher component and is connected with the diesel particle catcher component, and the selective catalytic reducer component is positioned at the downstream of the mixer component and is connected with the mixer component, and the mixer component is the mixer component.
Compared with the prior art, the shell comprises the urea nozzle seat used for installing the urea nozzle and the porous pipe fixed on the inner wall of the shell and corresponding to the urea nozzle seat, wherein the porous pipe is positioned in the mixing cavity and provided with a plurality of perforations distributed along the circumferential direction of the porous pipe, and the perforations are configured to allow air flow to pass through to reach the urea nozzle seat, so that the urea crystallization resistance of the urea nozzle seat is improved.
Drawings
FIG. 1 is a schematic perspective view of an exhaust aftertreatment package of the present disclosure in one embodiment.
Fig. 2 is a schematic perspective view of another angle of fig. 1.
Fig. 3 is a partially exploded perspective view of fig. 1.
Fig. 4 is a schematic perspective view of a mixer assembly of the present invention.
Fig. 5 is a schematic perspective view of another angle of fig. 4.
Fig. 6 is an exploded perspective view of fig. 4.
Fig. 7 is an exploded perspective view of the second and third plates of fig. 6.
Fig. 8 is a schematic perspective view of the swirl plate of fig. 6.
Fig. 9 is a right side view of fig. 4.
Fig. 10 is a schematic cross-sectional view taken along line A-A in fig. 9.
Detailed Description
Exemplary embodiments will be described in detail below with reference to the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of implementations consistent with aspects of the invention as set forth in the following claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature. Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be complemented or combined with each other without conflict.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Referring to fig. 1-3, an exhaust aftertreatment package 100 for treating engine exhaust to reduce emissions of harmful substances is disclosed. The exhaust aftertreatment package 100 includes an oxidation catalyst assembly (DOC) 1, a diesel particulate filter assembly 2 (DPF) downstream of the oxidation catalyst assembly 1 and connected to the oxidation catalyst assembly 1, a mixer assembly 3 downstream of the diesel particulate filter assembly 2 and connected to the diesel particulate filter assembly 2, and a selective catalytic reducer assembly (SCR) 4 downstream of the mixer assembly 3 and connected to the mixer assembly 3. In the illustrated embodiment of the invention, the oxidation catalyst assembly 1, the diesel particulate trap assembly 2 and the mixer assembly 3 are detachably connected by clamps for easy maintenance and replacement. In the illustrated embodiment of the invention, the oxidation catalyst assembly 1, the diesel particulate trap assembly 2, the mixer assembly 3 and the selective catalytic reducer assembly 4 are arranged in a straight line.
Referring to fig. 3 to 10, the mixer assembly 3 includes a housing 31, a first plate 41 disposed in the housing 31, a second plate 42 disposed downstream of the first plate 41 in the exhaust gas flow direction, and a third plate 43 disposed downstream of the second plate 42 in the exhaust gas flow direction. The mixer assembly 3 comprises an air inlet cavity 32, an air outlet cavity 33 and a mixing cavity 34 communicating the air inlet cavity 32 and the air outlet cavity 33. The air inlet cavity 32, the mixing cavity 34, and the air outlet cavity 33 are configured to circulate exhaust gas.
In the illustrated embodiment of the invention, the housing 31 is cylindrical and made of a metal material; of course, in other embodiments, the housing 31 may be other shapes, such as oval, etc.
The first plate 41 includes a blocking portion 411 and a partition portion 412 connected to the blocking portion 411. In the illustrated embodiment of the present invention, the blocking portion 411 and the partition portion 412 are perpendicular to each other, the blocking portion 411 extends in a vertical direction, and the partition portion 412 extends in a horizontal direction.
The mixing chamber 34 and the air inlet chamber 32 are located at two sides (for example, upper and lower sides) of the partition 412, and the partition 412 includes a communication hole 4121 that communicates the air inlet chamber 32 and the mixing chamber 34.
The housing 31 comprises a urea nozzle seat 35 for mounting a urea nozzle 5, the urea nozzle 5 being arranged to inject urea droplets into the mixing chamber 34, the exhaust gas entering the mixing chamber 34 and the urea droplets having at least a main component (e.g. an upward component) in opposite directions in respective flow directions, the exhaust gas having the main component and the urea droplets impinging on each other and being mixed in the mixing chamber 34.
In the illustrated embodiment of the invention, the mixing chamber 34 comprises a first space 341 between the first plate 41 and the second plate 42, a second space 342 between the second plate 42 and the third plate 43, and a third space 343 downstream of the third plate 43.
The partition 412 is further provided with a first bump 4125 protruding upward to enhance structural strength. The communication hole 4121 is provided at least partially on the first bulge portion 4125.
The housing 31 further comprises a perforated tube 36 fixed to the inner wall of the housing 31 and corresponding to the urea nozzle seat 35, the perforated tube 36 being located in the mixing chamber 34, the perforated tube 36 being provided with a plurality of perforations 361 distributed along its circumference. In the illustrated embodiment of the invention, the perforated tube 36 is provided around the outer periphery of the mounting hole 351 of the urea nozzle holder 35 for mounting the urea nozzle 5. The plurality of perforations 361 are configured to allow the flow of air to pass through to the urea nozzle holder 35, avoiding urea crystallization due to the formation of "dead spaces" near the bottom of the urea nozzle holder 35. Preferably, the flow of air through the plurality of perforations 361 is able to purge the urea nozzle holder 35, thereby reducing the risk of urea crystallization on the urea nozzle holder 35. In addition, in the illustrated embodiment of the present invention, the urea nozzle holder 35 is a solid nozzle holder to further reduce the risk of urea crystals forming on the urea nozzle holder 35.
The second plate 42 is provided with a first fixing portion 421 fixed to the inner wall of the housing 31 and a first arc-shaped projection 422 projecting forward from the middle of the first fixing portion 421 into the mixing chamber 34. The first arc-shaped protrusion 422 spans the second plate 42 in the vertical direction, i.e., the first arc-shaped protrusion 422 extends to the top and bottom ends of the second plate 42 in the vertical direction. The first fixing portion 421 is located at two sides of the first arc-shaped protrusion 422. The first arc-shaped protrusion 422 is provided with a plurality of first air flow holes 4221. The first fixing portion 421 has a plurality of first air flow holes 4211 for allowing air to pass through. The second plate 42 is further provided with a first concave space 423 located behind the first arc-shaped protrusion 422. Further, the first fixing portion 421 is provided with a first socket 4212. The first arcuate projection 422 is provided with a second slot 4222.
The third plate 43 is provided with a second fixing portion 431 fixed to the inner wall of the housing 31 and a second arc-shaped protruding portion 432 protruding from the middle portion of the second fixing portion 431 forward at least partially into the first concave space 423. The second arc-shaped protruding portion 432 is provided with a plurality of second airflow perforations 4321. The second fixing portion 431 is provided with a plurality of second airflow through holes 4311 for the airflow to pass through. The second arc-shaped protrusion 432 does not cross the third plate 43 in the vertical direction, i.e., the second arc-shaped protrusion 432 does not extend to the top and bottom ends of the third plate 43 in the vertical direction. The second fixing portion 431 is located around the second arc-shaped protruding portion 432. In the illustrated embodiment of the present invention, the second arc-shaped protrusion 432 is punched from a middle portion of the third sheet 43, and the third sheet 43 is provided with a first tear 433 corresponding to an upper edge of the second arc-shaped protrusion 432 and a second tear 434 corresponding to a lower edge of the second arc-shaped protrusion 432.
The mixer assembly 3 includes an arcuate cavity 40 between the first arcuate projection 422 and the second arcuate projection 432. The length of the first arc-shaped protrusion 422 in the vertical direction is greater than the length of the second arc-shaped protrusion 432 in the vertical direction.
The mixer assembly 3 further comprises a swirl plate 44 located downstream of the third plate 43 in the airflow direction, the swirl plate 44 comprising a body portion 441 fixed to the inner wall of the housing 31, a plurality of swirl plates 442 punched from the body portion 441, and a slot 443 corresponding to each swirl plate; the body 441 and/or the swirl plate 442 are provided with air flow through holes 444. By providing the plurality of swirl vanes 442, a swirl can be formed to the gas flow, thereby contributing to an improvement in uniformity of ammonia distribution.
When assembled, the first tab 4122 of the partition 412 is inserted into the first slot 4212 of the first fixing portion 421, and the second tab 4123 of the partition 412 is inserted into the second slot 4222 of the first arc-shaped protrusion 422. In order to increase the tightness of the bond, it may be necessary to weld at the plugging location. The first arcuate groove 4124 conforms to the first arcuate projection 422.
The mixer assembly 3 includes an arcuate cavity 40 between the first arcuate projection 422 and the second arcuate projection 432. The length of the first arc-shaped protrusion 422 in the vertical direction is greater than the length of the second arc-shaped protrusion 432 in the vertical direction.
In operation, air flows in from the left side of the air inlet cavity 32; the air flow flows in the space located in the partition 412 under the barrier of the barrier 411; the air flow below the partition 412 then flows upward into the first space 341 through the communication hole 4121; when the injection condition is reached, the urea nozzle 5 located above the first space 341 injects atomized urea droplets downwards; the exhaust gas flowing upwards at this time is mixed with urea droplets injected downwards in the first space 341; the broken urea granules directly strike the second plate 42 following the air flow and ammonia gas is generated; the plurality of perforations 361 are configured to allow the air flow to pass through to the urea nozzle holder 35, thereby reducing the risk of urea crystallization on the urea nozzle holder 35; then, the air flow is distributed to two sides under the guidance of the first arc-shaped protrusion 422, and a part of the air flow directly passes through the first air flow holes 4211 and the first air flow holes 4221; then, the air flow entering the arc-shaped cavity 40 is again distributed to two sides under the guidance of the second arc-shaped protrusion 432, and of course, a part of the air flow directly passes through the second air flow through hole 4311 and the second air flow through hole 4321; the air flow is then directed by the swirl plate 44 to form a swirl flow; finally, the gas flow can be distributed relatively evenly over the inlet end face of the selective catalytic reducer assembly (SCR) 4.
In comparison with the prior art, the housing 31 of the present invention comprises a urea nozzle seat 35 for mounting the urea nozzle 5 and a porous tube 36 fixed on the inner wall of the housing 31 and corresponding to the urea nozzle seat 35, the porous tube 36 being located in the mixing chamber 34, the porous tube 36 being provided with a plurality of perforations 361 distributed along its circumference, the plurality of perforations 361 being configured to let the air flow pass through to reach the urea nozzle seat 35, thereby improving the resistance of the urea nozzle seat 35 against urea crystallization.
In addition, the above embodiments are only for illustrating the present invention and not for limiting the technical solutions described in the present invention, and it should be understood that the present invention should be based on those skilled in the art, and although the present invention has been described in detail with reference to the above embodiments, it should be understood that those skilled in the art may make modifications or equivalents to the present invention without departing from the spirit and scope of the present invention and all modifications thereof are intended to be included in the scope of the claims of the present invention.

Claims (12)

1. A mixer assembly, comprising: the device comprises a shell, a first plate, a second plate and a third plate, wherein the first plate is positioned in the shell, the second plate is positioned at the downstream of the first plate in the airflow flowing direction, the third plate is positioned at the downstream of the second plate in the airflow flowing direction, the first plate comprises a blocking part and a separating part connected with the blocking part, the mixer assembly comprises an air inlet cavity, an air outlet cavity and a mixing cavity communicated with the air inlet cavity and the air outlet cavity, the air inlet cavity, the mixing cavity and the air outlet cavity are used for allowing exhaust gas to circulate, the mixing cavity and the air inlet cavity are positioned at two sides of the separating part, and the separating part comprises communication holes communicated with the air inlet cavity and the mixing cavity; the shell comprises a urea nozzle seat for installing a urea nozzle and a porous pipe which is fixed on the inner wall of the shell and corresponds to the urea nozzle seat, the porous pipe is positioned in the mixing cavity, and the porous pipe is provided with a plurality of perforations distributed along the circumferential direction of the porous pipe; the urea nozzle is used for injecting urea liquid drops into the mixing cavity, so that the tail gas entering the mixing cavity and the urea liquid drops mutually collide and are mixed in the mixing cavity; the plurality of perforations are configured to allow the flow of air to pass through to the urea nozzle holder; the second plate is provided with a first fixing part fixed on the inner wall of the shell and a first arc-shaped protruding part protruding forwards from the middle part of the first fixing part and extending into the mixing cavity, and the first arc-shaped protruding part is provided with a plurality of first airflow perforations; the second plate is provided with a first concave space positioned behind the first arc-shaped convex part; the third plate is provided with a second fixing part fixed on the inner wall of the shell and a second arc-shaped protruding part protruding from the middle part of the second fixing part to at least partially extend into the first concave space, and the second arc-shaped protruding part is provided with a plurality of second airflow perforations.
2. The mixer assembly of claim 1 wherein: the blocking portion extends in a vertical direction, and the dividing portion extends in a horizontal direction.
3. The mixer assembly of claim 1 wherein: the first fixing part is provided with a first slot, and the first arc-shaped protruding part is provided with a second slot;
the partition is provided with a first tab inserted into the first slot and a second tab inserted into the second slot.
4. A mixer assembly as set forth in claim 3 wherein: the partition part is provided with a first arc-shaped groove which is fit with the shape of the first arc-shaped protruding part, and the second lug protrudes into the first arc-shaped groove.
5. The mixer assembly of claim 1 wherein: the mixer assembly includes an arcuate cavity between the first arcuate projection and the second arcuate projection; the first arc-shaped protruding portion stretches across the second plate in the vertical direction, and the first fixing portion is located on two sides of the first arc-shaped protruding portion.
6. The mixer assembly of claim 5 wherein: the second arc-shaped protruding portion does not cross the third plate along the vertical direction, and the second fixing portion is located around the second arc-shaped protruding portion.
7. The mixer assembly of claim 6 wherein: the first fixing part is provided with a plurality of first airflow through holes; the second fixing part is provided with a plurality of second airflow through holes.
8. The mixer assembly of claim 6 wherein: the second arc-shaped protruding portion is formed by stamping the middle of the third plate, and the third plate is provided with a first tearing opening corresponding to the upper edge of the second arc-shaped protruding portion and a second tearing opening corresponding to the lower edge of the second arc-shaped protruding portion.
9. The mixer assembly of claim 6 wherein: the length of the first arc-shaped protruding portion along the vertical direction is greater than the length of the second arc-shaped protruding portion along the vertical direction.
10. The mixer assembly of claim 1 wherein: the urea nozzle seat is a solid nozzle seat.
11. The mixer assembly of claim 1 wherein: the mixer assembly further comprises a swirl plate positioned downstream of the third plate in the airflow flowing direction, wherein the swirl plate comprises a body part fixed on the inner wall of the shell, a plurality of swirl plates punched from the body part and a slot corresponding to each swirl plate; the body part and/or the cyclone sheet is/are provided with an airflow through hole penetrating through.
12. An exhaust aftertreatment package comprising a diesel oxidation catalyst assembly, a diesel particulate trap assembly downstream of and connected to the diesel oxidation catalyst assembly, a mixer assembly downstream of and connected to the diesel particulate trap assembly, and a selective catalytic reducer assembly downstream of and connected to the mixer assembly, the mixer assembly being a mixer assembly as claimed in any one of claims 1 to 11.
CN202310894271.5A 2023-07-20 2023-07-20 Mixer assembly and exhaust aftertreatment package Pending CN116677482A (en)

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CN202310894271.5A CN116677482A (en) 2023-07-20 2023-07-20 Mixer assembly and exhaust aftertreatment package

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CN202310894271.5A CN116677482A (en) 2023-07-20 2023-07-20 Mixer assembly and exhaust aftertreatment package

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CN116677482A true CN116677482A (en) 2023-09-01

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CN202310894271.5A Pending CN116677482A (en) 2023-07-20 2023-07-20 Mixer assembly and exhaust aftertreatment package

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