CN112196646A - Mixer assembly and exhaust aftertreatment package - Google Patents
Mixer assembly and exhaust aftertreatment package Download PDFInfo
- Publication number
- CN112196646A CN112196646A CN202011279810.7A CN202011279810A CN112196646A CN 112196646 A CN112196646 A CN 112196646A CN 202011279810 A CN202011279810 A CN 202011279810A CN 112196646 A CN112196646 A CN 112196646A
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- CN
- China
- Prior art keywords
- pipe
- mixer assembly
- tube
- cyclone
- mixing
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- 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.)
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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
Abstract
A mixer assembly is used for being matched with a urea nozzle, the mixer assembly comprises a mixing pipe extending along the axial direction, a cyclone pipe positioned in the mixing pipe and a porous crushing pipe positioned in the mixing pipe, the cyclone pipe comprises an inner cavity, a plurality of cyclone sheets and a plurality of airflow inlets communicated with the inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; the cyclone tube and the porous crushing tube are arranged at intervals along the axial direction of the mixing tube. The invention also relates to an exhaust aftertreatment package with the mixer assembly. Compared with the prior art, the urea liquid drop spraying device has the advantages that the cyclone pipe and the porous crushing pipe are arranged at intervals along the axial direction of the mixing pipe, urea liquid drops can be sprayed onto the mixing pipe, on one hand, the time for the urea liquid drops to contact the pipe wall is delayed, on the other hand, the coverage area of the urea liquid drops is increased, and therefore the risk of urea crystallization is reduced.
Description
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
The existing exhaust aftertreatment package typically includes a mixer assembly including a swirl tube for mixing exhaust gas with urea droplets to promote evaporation of the urea droplets, reduce urea crystallization risk, and improve the performance of the exhaust aftertreatment package. However, how to reduce the risk of urea crystallization is a technical problem to be solved by the person skilled in the art.
Disclosure of Invention
The invention aims to provide a mixer assembly with strong urea crystallization resistance and an exhaust aftertreatment package.
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, the mixer assembly comprises a mixing pipe extending along the axial direction, a cyclone pipe positioned in the mixing pipe and a porous crushing pipe positioned in the mixing pipe, the cyclone pipe comprises an inner cavity, a plurality of cyclone sheets and a plurality of airflow inlets communicated with the inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; the cyclone tube and the porous crushing tube are arranged at intervals along the axial direction of the mixing tube.
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, at least one end of the porous crushing 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 solution of the present invention, the mixer assembly further includes a housing and an extension pipe connected to the mixing pipe and located 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 an axial direction of the mixing pipe.
As a further improvement of the invention, the extension pipe is at least partially wrapped on the periphery of the airflow inlet.
As a further improved technical scheme of the invention, the mixer assembly comprises a baffle plate which is arranged in the mixing pipe and sleeved on the cyclone pipe, and the baffle plate is positioned between the porous crushing pipe and the cyclone sheet along the axial direction of the mixing pipe.
As a further improved technical scheme of the invention, the extension pipe part is inserted and installed in the mixing pipe and is fixed by welding.
As a further improved technical scheme of the invention, the diameter of the porous crushing pipe is larger than that of the cyclone pipe.
As a further improved technical scheme of the invention, one end of the cyclone tube, which is close to the porous crushing tube, is provided with a bell mouth facing the porous crushing tube.
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 urea liquid drop spraying device has the advantages that the cyclone pipe and the porous crushing pipe are arranged at intervals along the axial direction of the mixing pipe, urea liquid drops can be sprayed onto the mixing pipe, on one hand, the time for the urea liquid drops to contact the pipe wall is delayed, on the other hand, the coverage area of the urea liquid drops is increased, and therefore the risk of urea crystallization is reduced.
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 a first embodiment.
Fig. 3 is an exploded perspective view of the mixer assembly of the present invention.
Fig. 4 is a top view of a mixer assembly of the present invention in a second embodiment.
Fig. 5 is a schematic sectional view taken along line a-a in fig. 4.
Fig. 6 is a schematic sectional view taken along line B-B in fig. 4.
Fig. 7 is a partially enlarged view of a picture frame portion C of fig. 6.
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. 1 to 7, the mixer assembly 3 includes a housing 5, a mixing tube 6 connected to the housing 5 and extending in an axial direction, 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 invention, the swirl tube 7 comprises an inner chamber 70, a plurality of swirl vanes 71 and a plurality of gas flow inlets 72 communicating with the inner chamber 70. The urea nozzle 8 is configured to spray atomized urea droplets into the inner cavity 70. The airflow inlet 72 communicates with the airflow chamber 51. The gas inlet 72 is used for introducing gas flow into the inner cavity 70 in a clockwise or counterclockwise direction and mixing with the urea droplets under the action of the cyclone plate 71.
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. At least one end of the porous crushing pipe 91 is provided with a plurality of mounting claws 910, and the mounting claws 910 are fixed on the inner wall of the mixing pipe 6. The cyclone tube 7 and the porous crushing tube 91 are arranged at intervals along the axial direction of the mixing tube 6.
In the illustrated embodiment of the present invention, 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 region corresponding to the gas flow inlet 72 is conical (as shown in fig. 2) or cylindrical (as shown in fig. 7).
Referring to fig. 4 to 7, in another embodiment of the present invention, the mixer assembly 3 includes a baffle 93 installed in the mixing tube 6 and sleeved on the cyclone tube 7, and the baffle 93 is located between the perforated crushing tube 91 and the cyclone sheet 71 along the axial direction of the mixing tube 6 to force most of the tail gas to rotate into the inner cavity 70 of the cyclone tube 7. Preferably, the diameter of the perforated breaker tube 91 is larger than the diameter of the cyclone tube 7, thereby facilitating a further delay in the time for the urea droplets to contact the tube wall and also facilitating an increase in the coverage area of the urea droplets. One end of the cyclone tube 7 close to the porous crushing tube 91 is provided with a bell mouth 73 facing the porous crushing tube 91, so that the airflow flows smoothly and is distributed uniformly.
Compared with the prior art, the cyclone tube 7 and the porous crushing tube 91 are arranged at intervals along the axial direction of the mixing tube 6, urea liquid drops are sprayed onto the mixing tube 6, so that the time for the urea liquid drops to contact the tube wall is delayed, the coverage area of the urea liquid drops is increased, and the risk of urea crystallization is reduced.
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 mixing pipe extending along the axial direction, a cyclone pipe positioned in the mixing pipe and a porous crushing pipe positioned in the mixing pipe, wherein the cyclone pipe comprises an inner cavity, a plurality of cyclone sheets and a plurality of airflow inlets communicated with the inner cavity, and the urea nozzle is used for spraying atomized urea liquid drops into the inner cavity; the cyclone tube and the porous crushing tube are arranged at intervals along the axial direction of the mixing tube.
2. 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.
3. The mixer assembly according to claim 1, wherein: at least one end of the porous crushing pipe is provided with a plurality of mounting claws, and the mounting claws are fixed on the inner wall of the mixing pipe.
4. The mixer assembly according to claim 1, wherein: the mixer assembly further comprises a shell and an extension pipe which is connected with the mixing pipe and is positioned at the upstream of the mixing pipe, the shell 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 mixing pipe.
5. The mixer assembly according to claim 4, wherein: the extension pipe is at least partially wrapped around the periphery of the airflow inlet.
6. The mixer assembly according to claim 1, wherein: the blender subassembly is including installing in the mixing tube and cup joint baffle on the whirl pipe, the baffle is followed the axial of mixing tube is located porous broken pipe with between the spinning disk.
7. The mixer assembly according to claim 1, wherein: the extension pipe portion is inserted and installed in the mixing pipe and fixed by welding.
8. The mixer assembly according to claim 1, wherein: the diameter of the porous crushing pipe is larger than that of the cyclone pipe.
9. The mixer assembly according to claim 8, wherein: one end of the cyclone tube, which is close to the porous crushing tube, is provided with a horn mouth facing the porous crushing tube.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011279810.7A CN112196646A (en) | 2020-11-16 | 2020-11-16 | Mixer assembly and exhaust aftertreatment package |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011279810.7A CN112196646A (en) | 2020-11-16 | 2020-11-16 | Mixer assembly and exhaust aftertreatment package |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112196646A true CN112196646A (en) | 2021-01-08 |
Family
ID=74033974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011279810.7A Pending CN112196646A (en) | 2020-11-16 | 2020-11-16 | Mixer assembly and exhaust aftertreatment package |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112196646A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047925A (en) * | 2021-04-07 | 2021-06-29 | 潍柴动力股份有限公司 | Mixer device and engine |
| CN115111030A (en) * | 2021-12-16 | 2022-09-27 | 长城汽车股份有限公司 | SCR tail gas aftertreatment hybrid mechanism, SCR tail gas aftertreatment system and vehicle |
-
2020
- 2020-11-16 CN CN202011279810.7A patent/CN112196646A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113047925A (en) * | 2021-04-07 | 2021-06-29 | 潍柴动力股份有限公司 | Mixer device and engine |
| CN115111030A (en) * | 2021-12-16 | 2022-09-27 | 长城汽车股份有限公司 | SCR tail gas aftertreatment hybrid mechanism, SCR tail gas aftertreatment system and vehicle |
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