CN109268114A - A kind of flow mixer for SCR system exhaust aftertreatment - Google Patents
A kind of flow mixer for SCR system exhaust aftertreatment Download PDFInfo
- Publication number
- CN109268114A CN109268114A CN201811389910.8A CN201811389910A CN109268114A CN 109268114 A CN109268114 A CN 109268114A CN 201811389910 A CN201811389910 A CN 201811389910A CN 109268114 A CN109268114 A CN 109268114A
- Authority
- CN
- China
- Prior art keywords
- flow
- mixing tube
- scr system
- exhaust aftertreatment
- air
- 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
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
- F01N3/18—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
- 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
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- 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
The present invention provides a kind of flow mixer for SCR system exhaust aftertreatment, including shell, mixing tube inside housings is arranged in the pressed sheet being arranged on housing exterior walls and the mounting base for installing urea liquid injector；Mixing tube top offers several exhaust mobile windows, eddy flow guide fins are connected on exhaust mobile window, several air-flow through-holes are offered in the middle part of mixing tube, mixing tube lower part is connected with multiple partitions, and mixing inside pipe wall is equipped with several in porous flow-disturbing fin ring cloth and below air-flow through-hole.Structure of the invention is compact, facilitates installation, is low in cost, urea liquid is crushed by spraying, reinforces evaporating multiple positions of mixer are purposive, improve the uniformity of the catalyst carrier entrance face of reducing agent, improve urea Crystallization, the spraying mixed with exhaust of urea liquid is improved, the transformation efficiency of nitrogen oxides is improved.
Description
Technical field
The present invention relates to technical field of environment protection equipment more particularly to a kind of fluid for SCR system exhaust aftertreatment are mixed
Clutch.
Background technique
According to future market needs, SCR technology is the important technology route for meeting diesel vehicle state six and the above emission regulation.
Used urea SCR system is by spraying into a certain amount of aqueous solution of urea into exhaust pipe, by atomization, evaporation, pyrolysis and hydrolytic process
Reducing agent ammonia is obtained, NOx is selectively reduced into N2 under the action of reducing agent by ammonia, to reduce NOx in exhaust
Content.The outstanding problem of SCR system in actual application is urea crystals problem, and a large amount of be rebuffed of urea droplets will cause
Local temperature is too low, easily forms crystallization in mixer wall surface or exhaust pipe wall surface.Another application problem, NH3 is distributed before carrier
Homogeneity question, NH3F, which is unevenly distributed, will lead to regional area NH3 leakage, and then cause NOx conversion in the thinning area NH3
Efficiency is too low, finally will affect the service life of catalyst and the performance of SCR system.
To solve the above-mentioned problems, disclosed in patent " exhaust aftertreatment mixing arrangement " Authorization Notice No. CN207178013U
Although tail gas mixing arrangement solves the above problem to a certain extent, exhaust gas stroke in mixer is shorter and mixes not
Sufficiently, however it remains the problem of crystallizing risk, not being fully solved urea atomization, uniformity.Due to post-processing catalyzed conversion
Device structure is compact, and the disturbance effect of conventional mixer is poor at present, and the mixed effect of exhaust and urea is poor, concentration distribution
Unevenly, crystallization is easy to produce in exhaust pipe, it is difficult to meet six discharge standard of state.
In view of this, it is necessary to flow mixer in the prior art be improved, to solve the above problems.
Summary of the invention
It is an object of the invention to disclose a kind of flow mixer for SCR system exhaust aftertreatment, compact-sized, side
Just installation, low in cost is crushed urea liquid by spraying, reinforces evaporating multiple positions of mixer are purposive, mentioned
The uniformity of the catalyst carrier entrance face of high reducing agent promotes urea Crystallization, promotes urea liquid by spraying and arranges
The mixed of gas improves the transformation efficiency of nitrogen oxides.
To achieve the above object, the present invention provides a kind of flow mixers for SCR system exhaust aftertreatment, including
Shell, the pressed sheet being arranged on housing exterior walls and the mounting base for installing urea liquid injector, setting is inside housings
Mixing tube；The mixing tube top offers several exhaust mobile windows, is connected with eddy flow on the exhaust mobile window
Guide fins, the mixing tube middle part offer several air-flow through-holes, and the mixing tube lower part is connected with multiple partitions, described
It mixes inside pipe wall and is equipped with several in porous flow-disturbing fin ring cloth and below air-flow through-hole.
In some embodiments, the eddy flow guide fins at left and right sides of mixing tube are pair with the axial line of mixing tube
Axis is claimed to be arranged symmetrically.
In some embodiments, several air-flow apertures are additionally provided on the mixing tube, the air-flow aperture is located at row
Above flow of air window.
In some embodiments, the mixing tube arranged beneath has arcuate guide insulation board, the arcuate guide heat preservation
Mobile window is offered on plate, and urea droplets are connected on the mobile window and are crushed fin.
In some embodiments, the partition is located at below air-flow through-hole, and the partition includes being connected on mixing tube
And separate first partition, second partition, third partition and the 4th partition of mixing tube exhaust entrance side and air exit side.
In some embodiments, the shell is cylindrical.
In some embodiments, the porous flow-disturbing fin is tilted down arrangement.
Compared with prior art, the beneficial effects of the present invention are: provided by the present invention for SCR system exhaust aftertreatment
Flow mixer, it is compact-sized, facilitate installation, is low in cost, urea liquid is sprayed multiple positions of mixer are purposive
Mist is crushed, reinforces evaporating, and the uniformity of the catalyst carrier entrance face of reducing agent is improved, and it is brilliant to improve urea resistive connection
Ability improves the spraying mixed with exhaust of urea liquid, improves the transformation efficiency of nitrogen oxides.
Detailed description of the invention
Fig. 1 is the schematic perspective view shown in the present invention for the flow mixer of SCR system exhaust aftertreatment；
Fig. 2 is the half sectional view shown in the present invention for the flow mixer of SCR system exhaust aftertreatment；
Fig. 3 is another visual angle figure of Fig. 1；
Fig. 4 is that the stereochemical structure for omitting shell for the flow mixer of SCR system exhaust aftertreatment shown in Fig. 1 is shown
It is intended to；
Fig. 5 is that the flow simulating in mixing tube eddy flow guide fins position section in Fig. 1 calculates slice map.
Specific embodiment
The present invention is described in detail for each embodiment shown in reference to the accompanying drawing, but it should be stated that, these
Embodiment is not limitation of the present invention, those of ordinary skill in the art according to these embodiments made by function, method,
Or equivalent transformation or substitution in structure, all belong to the scope of protection of the present invention within.
A kind of flow mixer for SCR system exhaust aftertreatment as shown in Figs. 1-5, including shell 1 are arranged in shell
Pressed sheet 2 on 1 outer wall of body and the mounting base 3 for installing urea liquid injector, are arranged in the mixing tube 4 inside shell 1.
Urea liquid injector is mounted in mounting base 3, injects urea into mixing tube 4 by urea liquid injector.The shell 1
Cylindrical, shell 1 is formed with exhaust entrance side and air exit side.
4 top of mixing tube offers several exhausts mobile window (not identifying), connects on the exhaust mobile window
Eddy flow guide fins 401 are connected to, the eddy flow guide fins 401 at left and right sides of mixing tube 4 are pair with the axial line of mixing tube 4
Claim axis to be arranged symmetrically, so that exhaust is formed swirling eddy in 4 two sides of mixing tube and enter in mixing tube 4, increase reducing agent mixed
It closes the residence time in pipe 4, the two strands of eddy flows in left and right collide on 1 air inlet side opposite of shell, further strengthen and spray to reducing agent
The diffusion of mist, evaporation, pyrolysis.
Offer several air-flow through-holes 402 in the middle part of the mixing tube 4, under the action of eddy flow, partial reduction agent spray liquid
Drop can collide with 4 inner wall of mixing tube, the setting of air-flow through-hole 402 for air guide, purging, on the one hand avoid due to eddy flow from
Spray droplet is rebuffed and 4 inner wall of mixing tube is caused to crystallize under mental power function, and it is spraying with exhaust on the other hand to strengthen reducing agent
Effect.
4 lower part of mixing tube is connected with multiple partitions, and the partition is located at 402 lower section of air-flow through-hole, the partition packet
Include the first partition 5 for being connected on mixing tube 4 and separating 4 exhaust entrance side of mixing tube and air exit side, second partition 6,
Three partitions 7 and the 4th partition 8.4 air exit side of mixing tube is also connected with the 5th partition 10 and the 6th partition 11, the described 5th every
Plate and the 6th partition are located at 4 top of mixing tube.
4 inner wall of mixing tube is equipped with several in porous flow-disturbing wing ring cloth and positioned at 402 lower section of air-flow through-hole
Piece 403, the porous flow-disturbing fin 403 are tilted down arrangement, and on the one hand the bulky grain drop in exhaust airstream is blocked
Effect is cut, bulky grain drop and the collision generation of porous flow-disturbing fin 403 are broken, on the other hand can increase the uniform of reducing agent
Property；In addition, porous flow-disturbing fin 403 can be to avoid generation crystallization and the row of can be effectively reduced on porous flow-disturbing fin 403
Atmidometer.
Several air-flow apertures 404 are additionally provided on the mixing tube 4, the air-flow aperture 404 is located at exhaust mobile window
Top keeps the reducing agent into mixing tube 4 spraying, when atomization is not sufficiently spread out also, spreads, passes through air-flow aperture 404
Purging, avoids that urea crystals occur near nozzle carrier.
4 arranged beneath of mixing tube has arcuate guide insulation board 9, may further spray droplet to air-flow center into
The mixing spraying to the reducing agent entered in mixing tube 4, evaporation pyrolysis are finally realized in row evaporation, pyrolysis, then will exhaust
Air-flow is oriented to two sides diffusion.It offers on the arcuate guide insulation board 9 mobile window (not indicating), connects on the mobile window
It is connected to urea droplets and is crushed fin 901, exhaust airstream is flowed out by mobile window.
The series of detailed descriptions listed above only for feasible embodiment of the invention specifically
Protection scope bright, that they are not intended to limit the invention, it is all without departing from equivalent implementations made by technical spirit of the present invention
Or change should all be included in the protection scope of the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms 4 personnel of art technology
The other embodiments being understood that.
Claims (7)
1. a kind of flow mixer for SCR system exhaust aftertreatment, which is characterized in that including shell (1), be arranged in shell
(1) pressed sheet on outer wall (2) and the mounting base (3) for installing urea liquid injector are arranged in the mixed of shell (1) inside
Close pipe (4)；
Mixing tube (4) top offers several exhaust mobile windows, is connected with eddy flow on the exhaust mobile window and draws
It leads fin (401), several air-flow through-holes (402), mixing tube (4) the lower part connection is offered in the middle part of the mixing tube (4)
There are multiple partitions, mixing tube (4) inner wall is equipped with several in ring cloth and porous below air-flow through-hole (402)
Flow-disturbing fin (403).
2. the flow mixer according to claim 1 for SCR system exhaust aftertreatment, which is characterized in that be located at mixed
The eddy flow guide fins (401) at left and right sides of pipe (4) are closed to be arranged symmetrically using the axial line of mixing tube (4) as symmetry axis.
3. the flow mixer according to claim 1 for SCR system exhaust aftertreatment, which is characterized in that described mixed
It closes and is additionally provided with several air-flow apertures (404) on pipe (4), the air-flow aperture (404) is located above exhaust mobile window.
4. the flow mixer according to claim 1 for SCR system exhaust aftertreatment, which is characterized in that described mixed
Closing pipe (4) arranged beneath has arcuate guide insulation board (9), offers mobile window on the arcuate guide insulation board (9), described
It is connected with urea droplets on mobile window and is crushed fin (901).
5. the flow mixer according to claim 1 for SCR system exhaust aftertreatment, which is characterized in that it is described every
Plate is located at below air-flow through-hole (402), and the partition includes being connected on mixing tube (4) and separating mixing tube (4) exhaust entrance
First partition (5), second partition (6), third partition (7) and the 4th partition (8) of side and air exit side.
6. the flow mixer according to claim 1 for SCR system exhaust aftertreatment, which is characterized in that the shell
Body (1) is cylindrical.
7. the flow mixer according to claim 1 for SCR system exhaust aftertreatment, which is characterized in that described more
Hole flow-disturbing fin (403) is tilted down arrangement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811389910.8A CN109268114A (en) | 2018-11-21 | 2018-11-21 | A kind of flow mixer for SCR system exhaust aftertreatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811389910.8A CN109268114A (en) | 2018-11-21 | 2018-11-21 | A kind of flow mixer for SCR system exhaust aftertreatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109268114A true CN109268114A (en) | 2019-01-25 |
Family
ID=65191253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811389910.8A Pending CN109268114A (en) | 2018-11-21 | 2018-11-21 | A kind of flow mixer for SCR system exhaust aftertreatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109268114A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973185A (en) * | 2019-03-20 | 2019-07-05 | 苏州国方汽车电子有限公司 | A kind of exhaust mixed structure for diesel engine vent gas post-processing |
| CN110848005A (en) * | 2019-11-26 | 2020-02-28 | 无锡亿利环保科技有限公司 | Engine tail gas aftertreatment mixing arrangement |
| CN114076017A (en) * | 2020-08-14 | 2022-02-22 | 三河市科达科技有限公司 | Nitrogen oxide mixed treatment device |
| CN114135370A (en) * | 2021-12-13 | 2022-03-04 | 一汽解放汽车有限公司 | Swirl mixer and tail gas purification device |
| CN114432946A (en) * | 2022-02-09 | 2022-05-06 | 无锡威孚力达催化净化器有限责任公司 | Double-outlet rotational flow gas-liquid mixing device |
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| DE102013012909A1 (en) * | 2013-08-05 | 2015-02-05 | Tenneco Gmbh | mixing chamber |
| CN206129367U (en) * | 2016-10-12 | 2017-04-26 | 天纳克（苏州）排放系统有限公司 | Exhaust aftertreatment device |
| CN207526559U (en) * | 2017-09-29 | 2018-06-22 | 天纳克一汽富晟(长春)汽车零部件有限公司 | Tail-gas after treatment apparatus |
| CN207989116U (en) * | 2018-01-26 | 2018-10-19 | 天纳克（苏州）排放系统有限公司 | Exhaust gas post-treatment device |
| CN108798852A (en) * | 2018-07-20 | 2018-11-13 | 山东康钧环保科技有限公司 | A kind of compact large-scale diesel engine exhaust gas processing device and method |
-
2018
- 2018-11-21 CN CN201811389910.8A patent/CN109268114A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013012909A1 (en) * | 2013-08-05 | 2015-02-05 | Tenneco Gmbh | mixing chamber |
| CN206129367U (en) * | 2016-10-12 | 2017-04-26 | 天纳克（苏州）排放系统有限公司 | Exhaust aftertreatment device |
| CN207526559U (en) * | 2017-09-29 | 2018-06-22 | 天纳克一汽富晟(长春)汽车零部件有限公司 | Tail-gas after treatment apparatus |
| CN207989116U (en) * | 2018-01-26 | 2018-10-19 | 天纳克（苏州）排放系统有限公司 | Exhaust gas post-treatment device |
| CN108798852A (en) * | 2018-07-20 | 2018-11-13 | 山东康钧环保科技有限公司 | A kind of compact large-scale diesel engine exhaust gas processing device and method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109973185A (en) * | 2019-03-20 | 2019-07-05 | 苏州国方汽车电子有限公司 | A kind of exhaust mixed structure for diesel engine vent gas post-processing |
| CN109973185B (en) * | 2019-03-20 | 2021-01-12 | 苏州国方汽车电子有限公司 | Exhaust mixing structure for diesel engine tail gas aftertreatment |
| CN110848005A (en) * | 2019-11-26 | 2020-02-28 | 无锡亿利环保科技有限公司 | Engine tail gas aftertreatment mixing arrangement |
| CN110848005B (en) * | 2019-11-26 | 2020-10-20 | 无锡亿利环保科技有限公司 | Engine tail gas aftertreatment mixing arrangement |
| CN114076017A (en) * | 2020-08-14 | 2022-02-22 | 三河市科达科技有限公司 | Nitrogen oxide mixed treatment device |
| CN114135370A (en) * | 2021-12-13 | 2022-03-04 | 一汽解放汽车有限公司 | Swirl mixer and tail gas purification device |
| CN114432946A (en) * | 2022-02-09 | 2022-05-06 | 无锡威孚力达催化净化器有限责任公司 | Double-outlet rotational flow gas-liquid mixing device |
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Application publication date: 20190125 |