CN102444453A - Static mixer for exhaust system - Google Patents
Static mixer for exhaust system Download PDFInfo
- Publication number
- CN102444453A CN102444453A CN2011104163269A CN201110416326A CN102444453A CN 102444453 A CN102444453 A CN 102444453A CN 2011104163269 A CN2011104163269 A CN 2011104163269A CN 201110416326 A CN201110416326 A CN 201110416326A CN 102444453 A CN102444453 A CN 102444453A
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- China
- Prior art keywords
- fin
- static mixer
- mixer
- main body
- vent systems
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- 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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- Exhaust Gas After Treatment (AREA)
Abstract
The invention provides a static mixer for an exhaust system. A group of wing piece pairs and wing pieces are uniformly distributed in an exhaust pipe; wing piece main bodies and the cross section of a pipe body form a certain included angle; and fins of the wing pieces and the wing piece main bodies also form a certain included angle. By calculation and analysis of special CFD (computational fluid dynamics) software, the mixer can effectively increase the gas disturbance, turbulent flow is obtained after waste gas of an engine and urea drops are treated by the mixer, the waste gas and the urea drops can be fully mixed, higher distribution uniformity is obtained before the mixture enters an SCR (selective catalytic reduction) catalytic converter, and further the mixture reacts fully, so that the content of NOx in the tail gas of a car is reduced. According to the mixer, the mixing effect is good and the exhaust back pressure is low. The mixer is compact in structure and convenience in installation, can be widely applied to an exhaust pipeline of a diesel engine with a urea SCR system.
Description
Technical field
Patent of the present invention relates to the automobile exhaust system field, relates to the static mixer of a kind of automobile-used urea SCR system in particular.
Background technique
At present, the application of static mixer on automobile more and more widely become the mix of improving urea and tail gas at present, reduces a kind of development trend of NOx discharging.In general, present vent systems all requires under the prerequisite that satisfies exhaust back pressure and not loss effective engine power, reduces the NOx discharging as much as possible.Therefore; Present automobile exhaust system all requires urea water and tail gas before getting into the SCR catalyst converter, can access sufficient mixing; Because only have the mixer of higher inhomogeneity urea and tail gas, could in the SCR catalyst converter, react fully, and then reduce the discharge amount of NOx.But, arrange that mixer contradicts with the reduction exhaust resistance usually, i.e. the setting of mixer is many more, and the exhaust back pressure of vent systems is just big more, and corresponding effective engine power consume is also just many more.And if do not adopt certain mixer, urea and tail gas are fully mixed before getting into the SCR catalyst converter, reach the purpose that significantly reduces NOx.
Summary of the invention
Patent of the present invention is to having the fluid retention district behind the conventional static mixer in the existing technology; The disturbance effect is relatively poor, and the mixed effect of tail gas and urea is relatively poor, and CONCENTRATION DISTRIBUTION is inhomogeneous; Cause all unfavorable shortcoming of conversion ratio and the escaping of ammonia rate; Aimed to provide a kind of vent systems static mixer, not only can not produce very big back pressure again so that the urea and the tail gas that spray are mixed fully.
The technological scheme that addresses the above problem employing is: a kind of vent systems static mixer; Comprise body and the one group of fin that is distributed in the said body; Fin in the middle of it is characterized in that at least is provided with in pairs, and said each fin comprises main body and at least one fin, the cross section of described main body and body degree in a certain angle; The fin of fin and fin main body degree also in a certain angle arranges, adjacent fins between leave the gap; Described body two ends link to each other with rear end pipeline or catalyst converter with exhaust duct respectively.
The present invention adopt many to fin to being evenly arranged in the outlet pipe; And the main body of fin and the cross section of body degree in a certain angle, the fin of fin and fin main body degree also in a certain angle is arranged, leaves the gap between the adjacent fins; Make in the mixer pipeline and form eddy current, increase disturbance.Analyze through CFD special designs computed in software, the mixer exhaust back pressure of this structure is little, reaches both to make that the urea and the tail gas that spray are mixed fully, can not produce the purpose of very big pressure drop.
According to the present invention, described body one end links to each other with exhaust duct through adpting flange, and the other end links to each other with rear end pipeline or catalyst converter.Thereby the present invention can link to each other with exhaust duct through dismountable mode.
According to the present invention, described nozzle is arranged on the downstream of body.Under low temperature condition, urea liquid deposits easily, is arranged on the mixer back to nozzle, has avoided on mixer, depositing, and stops up the problem of exhaust duct.Nozzle location is located at the flow-disturbing active region, can let urea and tail gas mix fully, reduces deposition.
According to the present invention, described wing main body two ends are fixed by welding on the inwall of body.
According to the present invention; Described one group of fin by in the middle of being arranged on many to fin to be arranged on before form with two last fins; Adjacent fins between leave the gap; And the fin that is adjacent of two last fins between also leave the gap, and the fin of fin is evenly arranged on the main body of fin.
According to the present invention, described fin sum is advisable with 4-12, and fin is to even setting.
According to the present invention, the angle of the main body of described fin and body cross section is 10 degree-80 degree.
According to the present invention, the fin of described fin and the angle of its main body are 10 degree-90 degree.
According to the present invention, said mixer body adopts 304 above stainless steel materials to make.
A kind of vent systems static mixer of the present invention, adopt many to fin to being evenly arranged in the outlet pipe with fin, and the cross section of the main body of fin and body degree in a certain angle; The fin of fin and fin main body degree also in a certain angle arranges, adjacent fins between leave the gap, make in the mixer pipeline and form eddy current; Increase flow-disturbing, fully mixed after making engine exhaust and urea droplets through mixer, obtain higher distributing homogeneity before getting into its device of SCR catalyzed conversion; And then react fully, to reduce the content of NOx in the vehicle exhaust, this mixer mixing is effective; Exhaust back pressure is little; This mixer structure is compact, and is easy for installation, can be widely used in the diesel exhaust gas pipeline with the urea SCR system.
Description of drawings
Fig. 1 is the automotive exhaust system structure schematic representation.
Be labeled as among the figure:
1, adpting flange;
2, body;
3, mixer vane cluster;
4, nozzle;
5, mixer rear end pipeline;
6, catalyst converter;
7, catalyst carrier;
8, pipeline behind the catalyst converter;
9, adpting flange;
10, adpting flange;
31, fin is right;
31-1,31-2,31-3,31-4,31-5,31-6, mixer fin;
311, mixer fin main body;
312, the fin of mixer fin.
Fig. 2 is the structural representation of mixer fin of the present invention.
Fig. 3 is the mixer plan view.
Fig. 4 is the axonometric drawing of mixer fin.
Fig. 5 is the plan view of mixer fin.
Fig. 6 is the formation schematic representation of the fin of mixer fin.
Embodiment
Contrast accompanying drawing below; Through description to embodiment; To the embodiment of patent of the present invention, for example: the shape of each structure, structure and the mutual alignment relation between each and annexation, each effect and working principle etc. are done further detailed explanation:
With reference to Fig. 1, adopt a kind of vent systems of the present invention, comprise pipeline 8 behind static mixer of the present invention, nozzle 4, mixer rear end pipeline 5, catalyst converter 6 and the catalyst converter.Pipeline 8 is connected through adpting flange successively behind exhaust duct, static mixer 3, mixer rear end pipeline 5, catalyst converter 6 and the catalyst converter.
Described body 2 two ends link to each other with rear end pipeline 5 with exhaust duct through adpting flange 1,9 respectively.Described nozzle 4 is arranged on the downstream of mixer fin 3.
Static mixer of the present invention obtains abundant disturbance after utilizing waste gas and urea through mixer and mixes, and before getting into the SCR catalyst converter, obtains higher uniformity, and then reacts fully, to reduce the content of NOx in the exhaust.
Said like accompanying drawing 2 with Fig. 3; A kind of vent systems static mixer of the present invention; Automobile-used urea SCR system static mixer comprises body 2 and the one group of fin 3 that is distributed in the body 2, described one group of fin by many in the middle of being arranged on to 31 pairs of fins, before being arranged on a fin 31-1 and be arranged on a last fin 31-6 and form; Adjacent fins leaves the gap between 31, before and the fin that is adjacent of two last fins between also leave the gap.
Described each fin is symmetrical set by two fins 31 and constitutes, and the main body card of two fins closes, and fin is opposing to be opened.
With reference to Fig. 4 and Fig. 5, said each fin comprises main body 311 and a plurality of fins 312, and the main body 311 of fin and the cross section degree in a certain angle of body 2, and the fin 312 of fin is arranged with fin main body 311 degree also in a certain angle.
With reference to Fig. 6; The main body 311 and the fin 312 of fin are overall structure; Described fin 312 forms by following method: the main body 311 of fin evenly is separated into several quadrilateral areas 313; Each quadrilateral area 313 is cut apart with a knife or scissors along diagonal 314, one of them triangle is turned up, this folded up portion divides formation a fin 312; All fins 312 on the same fin are turned up by identical direction.
Above-mentioned quadrilateral area 313 comprises the quadrilateral area and middle quadrilateral area of both sides.Wherein, middle quadrilateral area is the parallelogram zone.The diagonal of all quadrilateral areas is parallel to each other, and turns up the limit and also is parallel to each other, and can guarantee that like this each fin 312 also is parallel to each other, and be of similar shape.
Said body 2 adopts 304 above stainless steel materials to make.
The above-mentioned accompanying drawing that combines has carried out exemplary description to patent of the present invention, but the concrete realization of patent of the present invention does not receive the restriction of aforesaid way.As long as adopted the design of patent of the present invention and the improvement of the various unsubstantialities that technological scheme is carried out, or the design of patent of the present invention and technological scheme are directly applied to other occasion, all within the protection domain of patent of the present invention without improving.
Adopt technological scheme of the present invention, not only can improve the transformation efficiency of SCR, reduced the formation of urea crystals, can not produce very big pressure drop again so that the aqueous solution of urea of nozzle ejection and vehicle exhaust are mixed fully.
Claims (10)
1. vent systems static mixer; Comprise body (2) and be distributed on one group of fin in the said body (2); Fin in the middle of it is characterized in that at least is provided with in pairs, and each fin comprises main body (311) and at least one fin (312), the cross section degree in a certain angle of main body of described fin (311) and body (2); The fin of said fin (312) arranges that with fin main body (311) degree also in a certain angle adjacent fins is to leaving the gap between (31); Described body (2) two ends link to each other with rear end pipeline (5) or catalyst converter (6) with exhaust duct respectively.
2. like right 1 described a kind of vent systems static mixer, it is characterized in that described body (2) two ends link to each other with rear end pipeline (5) or catalyst converter (6) with exhaust duct through adpting flange (1,9) respectively.
3. like right 1 described a kind of vent systems static mixer, it is characterized in that the nozzle (4) of said system is arranged on the downstream of said body.
4. like right 1 described a kind of vent systems static mixer, it is characterized in that described fin main body (311) two ends are fixed by welding on the inwall of body (2).
5. like right 1 described a kind of vent systems static mixer, it is characterized in that (31-1 31-6) forms described one group of fin (3), and adjacent fins is to leaving the gap between (31) to (31) and fin by fin.
6. like right 1 described a kind of vent systems static mixer; The fin (312) that it is characterized in that described fin is gone up evenly layout in the main body (311) of fin; Described fin (312) forms by following method: the main body (311) of fin evenly is separated into several quadrilateral areas (313); Each quadrilateral area (313) is cut apart with a knife or scissors along diagonal (314), one of them triangle is turned up, this folded up portion is divided a formation fin (312); All fins (312) on the same fin are turned up by identical direction.
7. like right 1 described a kind of vent systems static mixer, it is characterized in that the fin of described one group of fin (3) adds up to 4-12, and fin is provided with evenly to (31).
8. like right 1 described a kind of vent systems static mixer, it is characterized in that the main body (311) of described fin and the angle of body (2) cross section are 10 degree-80 degree.
9. like right 1 described a kind of vent systems static mixer, it is characterized in that the fin (312) of described fin and the angle of its main body (311) are 10 degree-90 degree.
10. like any one described a kind of vent systems static mixer of right 1-9, it is characterized in that said body (2) adopts 304 above stainless steel materials to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104163269A CN102444453A (en) | 2011-12-14 | 2011-12-14 | Static mixer for exhaust system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104163269A CN102444453A (en) | 2011-12-14 | 2011-12-14 | Static mixer for exhaust system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102444453A true CN102444453A (en) | 2012-05-09 |
Family
ID=46007327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104163269A Pending CN102444453A (en) | 2011-12-14 | 2011-12-14 | Static mixer for exhaust system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102444453A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102840018A (en) * | 2012-09-29 | 2012-12-26 | 江苏绿源环保科技有限公司 | Gas mixing device of tail gas denitration SCR (Semiconductor Control Rectifier) system of high-power diesel engine for ship |
| CN103528418A (en) * | 2013-10-31 | 2014-01-22 | 北京航空航天大学 | Swallow-shaped vortex fin |
| CN104791050A (en) * | 2015-03-04 | 2015-07-22 | 刘君才 | Static mixer type automobile exhaust filtering/silencing device |
| CN105041433A (en) * | 2015-09-01 | 2015-11-11 | 安徽江淮汽车股份有限公司 | Automotive SCR system |
| CN105715341A (en) * | 2016-02-15 | 2016-06-29 | 东风朝阳朝柴动力环保科技有限公司 | Mixing flow spoiler for selective catalytic reduction system |
| CN107524547A (en) * | 2017-10-18 | 2017-12-29 | 国营第六六厂 | The premixed high-speed high-power efficient mixing arrangement of gas homogeneous used for natural gas engine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101450293A (en) * | 2008-12-22 | 2009-06-10 | 西安热工研究院有限公司 | Fin type blunt body static mixing device |
| CN102242662A (en) * | 2010-05-10 | 2011-11-16 | 杭州银轮科技有限公司 | Static mixer of selective catalytic reduction (SCR) denitration system |
| CN202391524U (en) * | 2011-12-14 | 2012-08-22 | 杭州银轮科技有限公司 | Static mixer for exhaust systems |
-
2011
- 2011-12-14 CN CN2011104163269A patent/CN102444453A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101450293A (en) * | 2008-12-22 | 2009-06-10 | 西安热工研究院有限公司 | Fin type blunt body static mixing device |
| CN102242662A (en) * | 2010-05-10 | 2011-11-16 | 杭州银轮科技有限公司 | Static mixer of selective catalytic reduction (SCR) denitration system |
| CN202391524U (en) * | 2011-12-14 | 2012-08-22 | 杭州银轮科技有限公司 | Static mixer for exhaust systems |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102840018A (en) * | 2012-09-29 | 2012-12-26 | 江苏绿源环保科技有限公司 | Gas mixing device of tail gas denitration SCR (Semiconductor Control Rectifier) system of high-power diesel engine for ship |
| CN103528418A (en) * | 2013-10-31 | 2014-01-22 | 北京航空航天大学 | Swallow-shaped vortex fin |
| CN103528418B (en) * | 2013-10-31 | 2015-06-24 | 北京航空航天大学 | Swallow-shaped vortex fin |
| CN104791050A (en) * | 2015-03-04 | 2015-07-22 | 刘君才 | Static mixer type automobile exhaust filtering/silencing device |
| CN105041433A (en) * | 2015-09-01 | 2015-11-11 | 安徽江淮汽车股份有限公司 | Automotive SCR system |
| CN105715341A (en) * | 2016-02-15 | 2016-06-29 | 东风朝阳朝柴动力环保科技有限公司 | Mixing flow spoiler for selective catalytic reduction system |
| CN107524547A (en) * | 2017-10-18 | 2017-12-29 | 国营第六六厂 | The premixed high-speed high-power efficient mixing arrangement of gas homogeneous used for natural gas engine |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120509 |