CN118705034A - Exhaust aftertreatment mixing device for engine - Google Patents
Exhaust aftertreatment mixing device for engine Download PDFInfo
- Publication number
- CN118705034A CN118705034A CN202410946562.9A CN202410946562A CN118705034A CN 118705034 A CN118705034 A CN 118705034A CN 202410946562 A CN202410946562 A CN 202410946562A CN 118705034 A CN118705034 A CN 118705034A
- Authority
- CN
- China
- Prior art keywords
- baffle
- cavity
- mixing device
- engine exhaust
- exhaust aftertreatment
- 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
Links
- 239000000835 fiber Substances 0.000 claims description 27
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 19
- 239000004202 carbamide Substances 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 210000002268 wool Anatomy 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000006260 foam Substances 0.000 claims 1
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
An engine exhaust aftertreatment mixing device includes a housing, a first baffle mounted in the housing, and a second baffle mounted in the housing and spaced from the first baffle, the housing forming a mixing chamber between the first baffle and the second baffle. The engine exhaust aftertreatment mixing device also includes a support plate positioned in the mixing chamber. The mixing cavity comprises a first cavity and a second cavity; the first baffle is provided with an exhaust inlet communicated with the first cavity, and the second baffle is provided with an exhaust outlet communicated with the second cavity. The first cavity is formed by arranging the first baffle, the second baffle and the supporting plate, so that the structure is skillfully simplified.
Description
The present application is a divisional application of patent application with application date 2019, 01 and 10, application number 201910023028.X and inventive name of "engine exhaust gas aftertreatment mixing device".
Technical Field
The invention relates to an engine exhaust aftertreatment mixing device, and belongs to the technical field of exhaust aftertreatment.
Background
The current industry uses mixer metal structures to achieve mixing of urea droplets with exhaust gas. Generally, porous plates, fins and other structures are arranged in the mixer, so that urea liquid drops collide with the mixer with a metal structure to break up the urea liquid drops into smaller liquid drops, and evaporation and pyrolysis on the metal surface are facilitated.
The prior art already has the arrangement of the trend of the air flow and the mixing of urea droplets with the exhaust gas by designing the Z-shaped partition to cooperate with the mixing tube; however, the Z-shaped separator is complex in structure and is easily deformed by high-temperature exhaust.
Therefore, there is a need to provide a new solution to the above technical difficulties.
Disclosure of Invention
The invention aims to provide an engine exhaust aftertreatment mixing device with a simple structure.
In order to achieve the above purpose, the invention adopts the following technical scheme: an engine exhaust aftertreatment mixing device comprising a housing, a first baffle mounted within the housing and a second baffle mounted within the housing and spaced apart from the first baffle, the housing forming a mixing chamber between the first baffle and the second baffle, the engine exhaust aftertreatment mixing device further comprising a support plate positioned within the mixing chamber, the support plate comprising a first side wall, a second side wall, and a connecting wall connecting the first side wall and the second side wall, the mixing chamber comprising a first cavity positioned at one end of the connecting wall and a second cavity positioned at the other end of the connecting wall; the first cavity is surrounded by the shell, the first baffle, the second baffle and the supporting plate, the first baffle is provided with an exhaust inlet communicated with the first cavity, and the second baffle is provided with an exhaust outlet communicated with the second cavity; the second baffle is provided with a baffle wall part which shields the first cavity from the rear end, the baffle wall part is arranged opposite to the exhaust inlet, and the baffle wall part is configured to force the air flow entering the first cavity from the exhaust inlet to pass through the connecting wall so as to enter the second cavity.
As a further improved technical scheme of the invention, the shell is used for installing a urea nozzle;
the engine exhaust aftertreatment mixing device further includes a fine fiber element mounted on the connecting wall;
The urea nozzle is used for spraying atomized urea liquid drops into the mixing cavity, and the fine fiber element is used for exhausting gas and enabling the urea liquid drops to pass through so as to further increase the breaking and evaporation of the urea liquid drops.
As a further development of the invention, the fine fiber elements are steel wool or foamed metal or ceramic porous material.
As a further improved technical scheme of the invention, the first cavity is positioned at the upper end of the fine fiber element, and the second cavity is positioned at the lower end of the fine fiber element.
As a further development of the invention, the first baffle plate is provided with two exhaust gas inlets and a perforation between the two exhaust gas inlets.
As a further development of the invention, the blocking wall closes off the first cavity from the rear end.
As a further improved technical scheme of the invention, the second baffle comprises an extension part which extends downwards from the baffle wall part, and the two exhaust outlets are respectively positioned at two sides of the extension part.
As a further improved technical solution of the present invention, the extension portion is deviated in a direction away from the first baffle, and a distal end of the extension portion is fixed on an inner wall of the housing.
As a further development of the invention, the support plate is fixed to the first baffle plate and the second baffle plate, and the first side wall and/or the second side wall has an inclined portion for guiding the air flow to the fine fiber element.
As a further development of the invention, the connecting wall is provided with mounting holes for mounting the fine fiber elements.
Compared with the prior art, the invention skillfully simplifies the structure and omits the mixing tube in the related art by arranging the first baffle, the second baffle and the supporting plate to form the first cavity.
Drawings
Fig. 1 is a schematic perspective view of an engine exhaust aftertreatment mixing device of the present disclosure.
Fig. 2 is an exploded perspective view of fig. 1.
Fig. 3 is a left side view of fig. 1.
Fig. 4 is a right side view of fig. 1.
Fig. 5 is a schematic cross-sectional view of line A-A of fig. 3.
Detailed Description
Referring to fig. 1-5, an engine exhaust aftertreatment mixing device 100 is disclosed for use in an engine exhaust aftertreatment package to treat engine exhaust gas. The engine exhaust aftertreatment package includes a first aftertreatment carrier assembly (not shown), a second aftertreatment carrier assembly (not shown) downstream of the first aftertreatment carrier assembly, and a third aftertreatment carrier assembly (not shown) downstream of the second aftertreatment carrier assembly. The engine exhaust aftertreatment mixing device 100 is located between the second and third aftertreatment carrier components. Preferably, the first aftertreatment carrier element is an oxidation catalyst (DOC), the second aftertreatment carrier element is a Diesel Particulate Filter (DPF), and the third aftertreatment carrier element is a Selective Catalytic Reducer (SCR).
The engine exhaust gas aftertreatment mixing device 100 includes a housing 1, a first baffle plate 2 mounted in the housing 1, and a second baffle plate 3 mounted in the housing 1 and disposed at a distance from the first baffle plate 2. The housing 1 is substantially cylindrical in the illustrated embodiment of the invention and comprises a mounting seat 11 for mounting a urea nozzle.
Referring to fig. 5, the housing 1 forms a mixing chamber 10 between the first baffle 2 and the second baffle 3. The engine exhaust aftertreatment mixing device 100 further comprises a support plate 4 located in the mixing chamber 10 and a fine fiber element 5 mounted on the support plate 4. The mixing chamber 10 comprises a first chamber 101 at one end of the fine fiber element 5 and a second chamber 102 at the other end of the fine fiber element 5. In the illustrated embodiment of the invention, the first cavity 101 is located at the upper end of the fine fiber element 5 and the second cavity 102 is located at the lower end of the fine fiber element 5.
Referring to fig. 1 and 3, the first baffle 2 has a disc shape. Preferably, the outer edge of the first baffle 2 is welded and fixed on the inner wall of the shell 1. The first baffle plate 2 is provided with an exhaust gas inlet 21 communicating with the first chamber 101. Preferably, the exhaust inlets 21 are two and symmetrically arranged. The first baffle plate 2 further comprises perforations 22 between the two exhaust inlets 21, said perforations 22 being able to regulate the back pressure. As regards the number and size of the perforations 22, they can be flexibly set according to the actual needs. The through hole 22 further comprises a plurality of through holes 23 which are arranged in an arc shape and are positioned at the lower edge of the through hole, and the through holes 23 are communicated with the second cavity 102 so as to play a role in adjusting the back pressure.
Referring to fig. 1, 4 and 5, the second baffle plate 3 is provided with a baffle wall 31 for sealing the first cavity 101 from the rear end, an extension portion 32 extending downward from the baffle wall 31, and exhaust outlets 33 respectively located at both sides of the extension portion 32. The outer edge of the second baffle 3 is welded and fixed to the inner wall of the housing 1, including the end of the extension 32. In the illustrated embodiment of the present invention, the extending portion 32 is offset in a direction away from the first baffle plate 2, and the extending portion 32 is provided with an inclined portion 321.
The support plate 4 is fixed with the first baffle 2 and the second baffle 3. Preferably, the first baffle plate 2 and the second baffle plate 3 are provided with welding grooves 211 and 311, and the support plate 4 is welded and fixed with the first baffle plate 2 and the second baffle plate 3 through the welding grooves 211 and 311. The support plate 4 is provided with a first side wall 41, a second side wall 42 converging towards the fine fiber element 5 and a connecting wall 43 connecting the first side wall 41 and the second side wall 42. The first side wall 41 and/or the second side wall 42 has an inclined portion 44 for guiding the air flow to the fine fiber element 5. The connecting wall 43 is provided with mounting holes 431 for mounting the fine fiber elements 5. The present invention skillfully simplifies the structure by arranging the support plate 4 and the fine fiber element 5 mounted on the support plate 4 between the first baffle plate 2 and the second baffle plate 3 without arranging a Z-shaped baffle plate.
The fine fiber elements 5 comprise steel wool or foamed metal or ceramic porous materials. The present invention utilizes a 3D porous or multi-void structure of fine fiber elements 5 (e.g., steel wool) through which the exhaust gas and the urea droplets pass to cause sufficient disruption and mixing of the urea droplets on the surface and inside of the steel wool. In addition, the wire diameter of the steel wool is smaller, the gap is complex, and the specific surface area is large. Because the specific surface area is large, a larger heat exchange area can be created in a limited space, and the heat exchange between urea liquid drops and exhaust gas is facilitated, so that the evaporation and pyrolysis of the urea liquid drops are facilitated, and the crystallization resistance is improved. The back pressure of the system can be adjusted accordingly by adjusting the density of the fine fiber element 5. Referring to fig. 2, in the illustrated embodiment of the invention, the fine fiber elements 5 comprise tubular bodies 51 that are welded together by a brazing process. The pipe body 51 is installed in the installation hole 431 and is fixed to an inner wall of the installation hole 431.
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 construed 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 invention and all technical solutions and modifications thereof should be covered by the scope of the claims of the present invention.
Claims (10)
1. An engine exhaust aftertreatment mixing device comprising a housing, a first baffle mounted within the housing and a second baffle mounted within the housing and spaced from the first baffle, the housing forming a mixing chamber between the first baffle and the second baffle, the engine exhaust aftertreatment mixing device further comprising a support plate positioned within the mixing chamber, the support plate comprising a first side wall, a second side wall, and a connecting wall connecting the first side wall and the second side wall, the mixing chamber comprising a first cavity positioned at one end of the connecting wall and a second cavity positioned at the other end of the connecting wall; the first cavity is surrounded by the shell, the first baffle, the second baffle and the supporting plate, the first baffle is provided with an exhaust inlet communicated with the first cavity, and the second baffle is provided with an exhaust outlet communicated with the second cavity; the second baffle is provided with a baffle wall part which shields the first cavity from the rear end, the baffle wall part is arranged opposite to the exhaust inlet, and the baffle wall part is configured to force the air flow entering the first cavity from the exhaust inlet to pass through the connecting wall so as to enter the second cavity.
2. The engine exhaust aftertreatment mixing device of claim 1, wherein: the shell is used for installing a urea nozzle;
the engine exhaust aftertreatment mixing device further includes a fine fiber element mounted on the connecting wall;
The urea nozzle is used for spraying atomized urea liquid drops into the mixing cavity, and the fine fiber element is used for exhausting gas and enabling the urea liquid drops to pass through so as to further increase the breaking and evaporation of the urea liquid drops.
3. The engine exhaust aftertreatment mixing device of claim 2, wherein: the fine fiber elements are steel wool or foam metal or ceramic porous materials.
4. The engine exhaust aftertreatment mixing device of claim 2, wherein: the first cavity is located at the upper end of the fine fiber element, and the second cavity is located at the lower end of the fine fiber element.
5. The engine exhaust aftertreatment mixing device of claim 1, wherein: the first baffle plate is provided with two exhaust inlets and a perforation between the two exhaust inlets.
6. The engine exhaust aftertreatment mixing device of claim 1, wherein: the blocking wall portion seals the first cavity from the rear end.
7. The engine exhaust aftertreatment mixing device of claim 6, wherein: the second baffle comprises an extension part which extends downwards from the baffle wall part, and the number of the exhaust outlets is two and the exhaust outlets are respectively positioned at two sides of the extension part.
8. The engine exhaust aftertreatment mixing device of claim 7, wherein: the extending part deviates in a direction away from the first baffle plate, and the tail end of the extending part is fixed on the inner wall of the shell.
9. The engine exhaust aftertreatment mixing device of claim 2, wherein: the support plate is fixed with the first baffle and the second baffle, and the first side wall and/or the second side wall has an inclined portion for guiding the air flow to the fine fiber element.
10. The engine exhaust aftertreatment mixing device of claim 9, wherein: the connecting wall is provided with mounting holes for mounting the fine fiber elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410946562.9A CN118705034A (en) | 2019-01-10 | 2019-01-10 | Exhaust aftertreatment mixing device for engine |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910023028.XA CN109538337B (en) | 2019-01-10 | 2019-01-10 | Exhaust aftertreatment mixing device for engine |
| CN202410946562.9A CN118705034A (en) | 2019-01-10 | 2019-01-10 | Exhaust aftertreatment mixing device for engine |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910023028.XA Division CN109538337B (en) | 2019-01-10 | 2019-01-10 | Exhaust aftertreatment mixing device for engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118705034A true CN118705034A (en) | 2024-09-27 |
Family
ID=65834823
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910023028.XA Active CN109538337B (en) | 2019-01-10 | 2019-01-10 | Exhaust aftertreatment mixing device for engine |
| CN202410946562.9A Pending CN118705034A (en) | 2019-01-10 | 2019-01-10 | Exhaust aftertreatment mixing device for engine |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910023028.XA Active CN109538337B (en) | 2019-01-10 | 2019-01-10 | Exhaust aftertreatment mixing device for engine |
Country Status (2)
| Country | Link |
|---|---|
| CN (2) | CN109538337B (en) |
| WO (1) | WO2020143391A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109538337B (en) * | 2019-01-10 | 2024-08-16 | 天纳克（苏州）排放系统有限公司 | Exhaust aftertreatment mixing device for engine |
| IT202000015346A1 (en) | 2020-06-25 | 2021-12-25 | Marelli Europe Spa | EXHAUST GAS TREATMENT DEVICE FOR AN EXHAUST SYSTEM OF AN INTERNAL COMBUSTION ENGINE |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6604356B1 (en) * | 2002-04-19 | 2003-08-12 | Envirolift, Llc | Emission control system for generator engine |
| JP2007032472A (en) * | 2005-07-28 | 2007-02-08 | Hitachi Ltd | Exhaust gas treatment device using urea water |
| JP5004308B2 (en) * | 2008-11-18 | 2012-08-22 | 三菱ふそうトラック・バス株式会社 | Engine exhaust purification system |
| CN204783187U (en) * | 2015-05-15 | 2015-11-18 | 杭州银轮科技有限公司 | Processing apparatus behind nozzle integrated form SCR |
| CN107514305B (en) * | 2016-06-15 | 2024-06-25 | 天纳克（苏州）排放系统有限公司 | Tail gas aftertreatment device |
| CN206016918U (en) * | 2016-08-30 | 2017-03-15 | 无锡威孚力达催化净化器有限责任公司 | A kind of carbamide injection mixed cell for cartridge type depurator |
| EP3392480B1 (en) * | 2017-04-21 | 2021-06-02 | Donaldson Company, Inc. | System for mixing a liquid spray into a gaseous flow and exhaust aftertreatment device comprising same |
| CN107165707A (en) * | 2017-07-27 | 2017-09-15 | 天纳克（苏州）排放系统有限公司 | Engine exhaust post-processes mixing arrangement and its after-treatment device and application |
| CN107165704A (en) * | 2017-07-27 | 2017-09-15 | 天纳克（苏州）排放系统有限公司 | Engine exhaust post-processes mixing arrangement and its after-treatment device and application |
| CN208040490U (en) * | 2017-12-29 | 2018-11-02 | 天纳克（苏州）排放系统有限公司 | Exhaust aftertreatment mixing arrangement and its encapsulation |
| CN108194179A (en) * | 2018-03-14 | 2018-06-22 | 潍柴动力股份有限公司 | A kind of post processing air inlet mixing arrangement |
| CN108757128A (en) * | 2018-06-28 | 2018-11-06 | 天纳克（苏州）排放系统有限公司 | Mixing chamber component |
| CN108625957B (en) * | 2018-07-03 | 2021-10-22 | 天纳克（苏州）排放系统有限公司 | Engine exhaust aftertreatment mixing device and method of making same |
| CN209413971U (en) * | 2019-01-10 | 2019-09-20 | 天纳克（苏州）排放系统有限公司 | Engine exhaust post-processes mixing arrangement |
| CN109538337B (en) * | 2019-01-10 | 2024-08-16 | 天纳克（苏州）排放系统有限公司 | Exhaust aftertreatment mixing device for engine |
-
2019
- 2019-01-10 CN CN201910023028.XA patent/CN109538337B/en active Active
- 2019-01-10 CN CN202410946562.9A patent/CN118705034A/en active Pending
- 2019-12-13 WO PCT/CN2019/124981 patent/WO2020143391A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020143391A1 (en) | 2020-07-16 |
| CN109538337B (en) | 2024-08-16 |
| CN109538337A (en) | 2019-03-29 |
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