CN112177723A - Mixer assembly and exhaust aftertreatment package - Google Patents

Mixer assembly and exhaust aftertreatment package Download PDF

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Publication number
CN112177723A
CN112177723A CN202011285878.6A CN202011285878A CN112177723A CN 112177723 A CN112177723 A CN 112177723A CN 202011285878 A CN202011285878 A CN 202011285878A CN 112177723 A CN112177723 A CN 112177723A
Authority
CN
China
Prior art keywords
mixer assembly
airflow inlet
airflow
parts
tube
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
CN202011285878.6A
Other languages
Chinese (zh)
Inventor
孙强
吴涛涛
金华
凌睿
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 CN202011285878.6A priority Critical patent/CN112177723A/en
Publication of CN112177723A publication Critical patent/CN112177723A/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
    • 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
    • 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]
    • 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
    • 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

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (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 is used for being matched with a urea nozzle and comprises a cyclone tube extending along the axial direction, the cyclone tube is formed by combining components which have the same structures and can be shared by at least two parts, the cyclone tube comprises an inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; the joint of two adjacent parts forms an airflow inlet communicated with the inner cavity, and the airflow inlet is used for introducing airflow into the inner cavity in a clockwise or anticlockwise direction and mixing the airflow with the urea liquid drops. The invention also relates to an exhaust aftertreatment package comprising the mixer assembly. Compared with the prior art, the cyclone tube is formed by combining at least two parts which have the same structure and can realize the sharing of parts, thereby reducing the complexity of the structure and further reducing the cost.

Description

Mixer assembly and exhaust aftertreatment package
Technical Field
The invention relates to a mixer assembly and an exhaust aftertreatment package, and belongs to the technical field of engine exhaust aftertreatment.
Background
Existing exhaust aftertreatment packages typically include a mixer assembly including a mixing tube to mix the exhaust with urea droplets to facilitate evaporation of the urea droplets, reduce urea crystallization risk, and improve the performance of the exhaust aftertreatment package. However, the mixing tube in the prior art has a complex structure and high cost.
Disclosure of Invention
The invention aims to provide a mixer assembly and an exhaust gas aftertreatment package with low cost.
In order to achieve the purpose, the invention adopts the following technical scheme: a mixer assembly is used for being matched with a urea nozzle and comprises a cyclone tube extending along the axial direction, the cyclone tube is formed by combining components which have the same structures and can be shared by at least two parts, the cyclone tube comprises an inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; the joint of two adjacent parts forms an airflow inlet communicated with the inner cavity, and the airflow inlet is used for introducing airflow into the inner cavity in a clockwise or anticlockwise direction and mixing the airflow with the urea liquid drops.
As a further improved technical solution of the present invention, the member includes a first member and a second member adjacent to the first member, the first member has a first side near the airflow inlet, the second member has a second side near the airflow inlet, the first side is provided with a first recess portion recessed toward the inner cavity, and the first recess portion and the second side together form the airflow inlet.
As a further improved technical solution of the present invention, the member includes a first member and a second member adjacent to the first member, the first member has a first side near the airflow inlet, the second member has a second side near the airflow inlet, the first side is provided with a first protrusion protruding in a direction away from the inner cavity, and the first protrusion and the second side together form the airflow inlet.
As a further improved technical solution of the present invention, the member includes a first member and a second member adjacent to the first member, the first member has a first side edge close to the airflow inlet, the second member has a second side edge close to the airflow inlet, the first side edge is provided with a first concave portion formed by being concave toward the inner cavity, the second side edge is provided with a second convex portion protruding away from the inner cavity, and the first concave portion and the second convex portion together form the airflow inlet.
As a further improved technical scheme of the invention, the outer surface of the cyclone tube corresponding to the area of the airflow inlet is conical or cylindrical.
As a further improved technical scheme of the invention, the mixer assembly comprises a porous crushing pipe which is connected with the cyclone pipe and is positioned at the downstream of the cyclone pipe.
As a further improved technical scheme of the invention, the mixer assembly comprises a mixing pipe sleeved on the cyclone pipe and the porous crushing pipe.
As a further improved technical scheme of the invention, one end of the porous crushing pipe, which is far away from the cyclone pipe, is provided with a plurality of mounting claws, and the mounting claws are fixed on the inner wall of the mixing pipe.
As a further improved technical scheme of the invention, the mixer assembly further comprises a housing and an extension pipe connected with the mixing pipe and located at the upstream of the mixing pipe, the housing is provided with an airflow cavity communicated with the airflow inlet, and the extension pipe protrudes into the airflow cavity along the axial direction of the cyclone pipe.
The invention also discloses an exhaust aftertreatment package, which comprises a diesel oxidation catalyst, a diesel particulate trap connected with the diesel oxidation catalyst and positioned at the downstream of the diesel oxidation catalyst, a mixer assembly connected with the diesel particulate trap, and a selective catalytic reduction agent connected with the mixer assembly and positioned at the downstream of the mixer assembly, wherein the mixer assembly is the mixer assembly.
Compared with the prior art, the cyclone tube is formed by combining at least two parts which have the same structure and can realize the sharing of parts, thereby reducing the complexity of the structure and further reducing the cost.
Drawings
FIG. 1 is a schematic view of an exhaust aftertreatment package of the present invention.
FIG. 2 is a schematic cross-sectional view of a mixer assembly of the present invention in one embodiment.
Fig. 3 is an exploded perspective view of the mixer assembly of the present invention.
Fig. 4 is a partially exploded perspective view of the mixer assembly of the present invention.
FIG. 5 is a schematic perspective view of the swirl tube and perforated breaker tube when connected together.
FIG. 6 is a top view of the perforated crash tube of FIG. 5 removed.
Fig. 7 is an exploded view of fig. 6.
FIG. 8 is an exploded perspective view of the swirl tube.
Fig. 9 is a schematic perspective view of a mixer assembly of the present invention in another embodiment.
Fig. 10 is a front view of fig. 9.
Fig. 11 is a schematic sectional view taken along line a-a in fig. 9.
FIG. 12 is a schematic perspective view of another embodiment of a swirl tube.
Fig. 13 is an exploded perspective view of fig. 12.
Detailed Description
Referring to fig. 1, the present invention discloses an exhaust gas aftertreatment package, which includes a Diesel Oxidation Catalyst (DOC)1, a Diesel Particulate Filter (DPF)2 connected to the diesel oxidation catalyst 1 and located downstream of the diesel oxidation catalyst 1, a mixer assembly 3 connected to the diesel particulate filter 2, and a Selective Catalytic Reduction (SCR)4 connected to the mixer assembly 3 and located downstream of the mixer assembly 3.
Referring to fig. 2 to 13, the mixer assembly 3 includes a housing 5, a mixing tube 6 connected to the housing 5, and a cyclone tube 7 located in the mixing tube 6. The housing 5 is provided with an airflow cavity 51 for letting the exhaust gas flow in. The exhaust gas flows into the gas flow chamber 51 and then flows through the mixer assembly 3. The mixer component 3 is used for being matched with the urea nozzle 8, the urea nozzle 8 is used for spraying atomized urea liquid drops into the cyclone tube 7, and tail gas is mixed with the urea liquid drops under the guidance of the mixer component 3 so as to realize the evaporation of the urea liquid drops.
In the illustrated embodiment of the present invention, the swirl tube 7 extends in the axial direction, and the swirl tube 7 is assembled by at least two parts 71 which have the same structure and can be shared by parts. The swirl tube 7 comprises an inner cavity 70 and the urea nozzle 8 is arranged to spray atomized urea droplets into the inner cavity 70. The joint of two adjacent parts 71 forms an airflow inlet 72 communicated with the inner cavity 70. The airflow inlet 72 communicates with the airflow chamber 51. The gas stream inlet 72 is configured to introduce a gas stream into the inner cavity 70 in a clockwise or counterclockwise direction and mix with the urea droplets.
In one embodiment of the present invention, the mixer assembly 3 further comprises a perforated breaker tube 91 connected to the swirl tube 7 and located downstream of the swirl tube 7, and an extension tube 92 connected to the mixing tube 6 and located upstream of the mixing tube 6. The mixing pipe 6 is sleeved on the cyclone pipe 7 and the porous crushing pipe 91. One end of the porous crushing pipe 91, which is far away from the cyclone pipe 7, is provided with a plurality of mounting claws 911, and the mounting claws 911 are fixed on the inner wall of the mixing pipe 6.
In one embodiment of the invention illustrated in the drawings, the swirl tube 7 is partially inserted and mounted in the perforated breaker tube 91 and is fixed by welding. The extension pipe 92 is partially inserted and installed in the mixing pipe 6 and fixed by welding. The extension tube 92 protrudes into the airflow cavity 51 in the axial direction of the swirl tube 7, and the extension tube 92 is at least partially wrapped around the periphery of the airflow inlet 72. So set up, extension pipe 92 can avoid getting into the tail gas in the airflow cavity 51 directly washes into in the cyclone tube 7. In fact, the exhaust gas entering the gas flow chamber 51 needs to bypass the extension tube 92 and then flow into the inner chamber 70 in a swirling manner from the gas flow inlet 72. This design is beneficial for improving the uniformity of the airflow distribution.
The outer surface of the cyclone tube 7 in the area corresponding to the gas flow inlet 72 is conical (as shown in fig. 5) or cylindrical (as shown in fig. 9).
The number of the parts 71 is two or more. As shown in fig. 5 to 11, the number of the parts 71 is three; referring to fig. 12 and 13, the number of the parts 71 is four.
Specifically, referring to fig. 8, in an embodiment of the present invention, the member 71 includes a first member 711 and a second member 712 adjacent to the first member 711, the first member 711 is provided with a first side 7111 close to the airflow inlet 72, the second member 712 is provided with a second side 7121 close to the airflow inlet 72, the first side 7111 is provided with a first concave portion 7112 formed by being concave toward the inner cavity 70, and the first concave portion 7112 and the second side 7121 together form the airflow inlet 72.
Specifically, referring to fig. 12 and 13, in another embodiment of the present invention, the member 71 includes a first member 711 and a second member 712 adjacent to the first member 711, the first member 711 is provided with a first side 7111 close to the airflow inlet 72, the second member 712 is provided with a second side 7121 close to the airflow inlet 72, the first side 7111 is provided with a first protrusion 7113 protruding away from the inner cavity 70, and the first protrusion 7113 and the second side 7121 together form the airflow inlet 72.
It is understood that in other embodiments, the member 71 includes a first member 711 and a second member 712 adjacent to the first member 711, the first member 711 is provided with a first side 7111 close to the airflow inlet 72, the second member 712 is provided with a second side 7121 close to the airflow inlet 72, wherein the first side 7111 is provided with a first concave portion 7112 concavely formed in the direction of the inner cavity 70, the second side 7121 is provided with a second convex portion (similar to the first convex portion 7113 in fig. 12 and 13) protruding in the direction away from the inner cavity 70, and the first concave portion 7112 and the second convex portion together form the airflow inlet 72.
Compared with the prior art, the cyclone tube 7 is formed by combining at least two parts 71 which have the same structure and can realize the sharing of parts, thereby reducing the complexity of the structure and the process and further reducing the cost.
The above embodiments are only for illustrating the invention and not for limiting the technical solutions described in the invention, and the understanding of the present specification should be based on the technical personnel in the field, and although the present specification has described the invention in detail with reference to the above embodiments, the technical personnel in the field should understand that the technical personnel in the field can still make modifications or equivalent substitutions to the present invention, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present invention should be covered in the claims of the present invention.

Claims (10)

1. A mixer assembly is used for being matched with a urea nozzle and is characterized by comprising a cyclone tube extending along the axial direction, wherein the cyclone tube is formed by combining at least two parts which have the same structure and can be shared by parts, the cyclone tube comprises an inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; the joint of two adjacent parts forms an airflow inlet communicated with the inner cavity, and the airflow inlet is used for introducing airflow into the inner cavity in a clockwise or anticlockwise direction and mixing the airflow with the urea liquid drops.
2. The mixer assembly according to claim 1, wherein: the part include first part and with the second part that first part is adjacent, first part is equipped with and is close to airflow inlet's first side, the second part is equipped with and is close to airflow inlet's second side, wherein first side be equipped with to the sunken first depressed part that forms of direction of interior cavity, first depressed part with the second side has formed jointly airflow inlet.
3. The mixer assembly according to claim 1, wherein: the part include first part and with the second part that the first part is adjacent, first part is equipped with and is close to airflow inlet's first side, the second part is equipped with and is close to airflow inlet's second side, wherein first side is equipped with to keeping away from the convex first bellying of direction of interior cavity, first bellying with the second side has formed jointly airflow inlet.
4. The mixer assembly according to claim 1, wherein: the part include first part and with the second part that first part is adjacent, first part is equipped with and is close to airflow inlet's first side, the second part is equipped with and is close to airflow inlet's second side, wherein first side be equipped with to the sunken first depressed part that forms of direction of interior cavity, the second side is equipped with to keeping away from the convex second bellying of direction of interior cavity, first depressed part with the second bellying has formed jointly airflow inlet.
5. The mixer assembly according to claim 1, wherein: the outer surface of the cyclone tube corresponding to the area where the airflow inlet is located is conical or cylindrical.
6. The mixer assembly according to claim 1, wherein: the mixer subassembly include with the cyclone tube is connected and is located the broken pipe of porous of cyclone tube's low reaches, the mixer subassembly is including cup jointing the cyclone tube with mixing tube on the broken pipe of porous.
7. The mixer assembly according to claim 1, wherein: the cyclone tube is formed by combining three parts or four parts which have the same structure and can realize the sharing of parts.
8. The mixer assembly according to claim 6, wherein: one end of the porous crushing pipe, which is far away from the cyclone pipe, is provided with a plurality of mounting claws, and the mounting claws are fixed on the inner wall of the mixing pipe.
9. The mixer assembly according to claim 6, wherein: the blender subassembly still includes the casing and with the hybrid tube is connected and is located the extension pipe in the upper reaches of hybrid tube, the casing be equipped with the air current cavity that the air current entry is linked together, the extension pipe is followed the protruding income of axial of whirl pipe in the air current cavity.
10. An exhaust aftertreatment package comprising a diesel oxidation catalyst, a diesel particulate trap connected to and downstream of the diesel oxidation catalyst, a mixer assembly connected to the diesel particulate trap, and a selective catalytic reduction agent connected to and downstream of the mixer assembly, wherein the mixer assembly is according to any one of claims 1 to 9.
CN202011285878.6A 2020-11-17 2020-11-17 Mixer assembly and exhaust aftertreatment package Pending CN112177723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011285878.6A CN112177723A (en) 2020-11-17 2020-11-17 Mixer assembly and exhaust aftertreatment package

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011285878.6A CN112177723A (en) 2020-11-17 2020-11-17 Mixer assembly and exhaust aftertreatment package

Publications (1)

Publication Number Publication Date
CN112177723A true CN112177723A (en) 2021-01-05

Family

ID=73918586

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011285878.6A Pending CN112177723A (en) 2020-11-17 2020-11-17 Mixer assembly and exhaust aftertreatment package

Country Status (1)

Country Link
CN (1) CN112177723A (en)

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