CN102242661A - Static mixer of vehicle selective catalytic reduction (SCR) device - Google Patents
Static mixer of vehicle selective catalytic reduction (SCR) device Download PDFInfo
- Publication number
- CN102242661A CN102242661A CN201010181712XA CN201010181712A CN102242661A CN 102242661 A CN102242661 A CN 102242661A CN 201010181712X A CN201010181712X A CN 201010181712XA CN 201010181712 A CN201010181712 A CN 201010181712A CN 102242661 A CN102242661 A CN 102242661A
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- static mixer
- catalytic reduction
- selective catalytic
- nozzle
- reduction device
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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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- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a static mixer for an automobile exhaust duct. The static mixer comprises a pipe body, fins and a nozzle. The static mixer is characterized in that: the nozzle is arranged on the pipe body, the fins are in an integrated structure, the middle parts of the fins are provided with circular passages, and a bent arc backflow plate and a fluid passage are arranged on four sides of the fins. According to the static mixer for the automobile exhaust duct, the direction of the fluid passage is consistent with the spraying direction of the nozzle, and turbulent flow is formed on the spraying axis, so that the spayed mist is fully mixed with the automobile exhaust. In addition, intensive turbulent flow can be formed on the corresponding wall of the spayed mist, so that the spayed mist on the wall is quickly mixed and evaporated. Therefore, through the static mixer, the aqueous solution of urea jet by the nozzle and the tail gas can be fully mixed before entering a selective catalytic reduction (SCR) catalyst, crystallization of the urea on the wall is reduced, and high pressure drop is not produced.
Description
Technical field
Patent of the present invention relates to automobile exhaust after-treatment system field, relates to a kind of automobile-used selective catalytic reduction device SCR system static mixer in particular.
Background technique
At present, the application of pipeline static mixer on the automobile exhaust after-treatment device more and more widely now become the mixing situation, the reduction NOx that improve aqueous solution of urea and vehicle exhaust and discharged, reduced a kind of development trend of urea at the outlet pipe intercrystalline.In general, present automobile-used selective catalytic reduction device SCR system all requires under the prerequisite that satisfies exhaust back pressure and not loss effective engine power, reduces the NOx discharging as much as possible and reduces the crystallization of urea in outlet pipe.Therefore, present automobile after-treatment device all requires aqueous solution of urea and tail gas can access sufficient mixing before entering the SCR catalyst converter, because only have the mixed gas of higher inhomogeneity aqueous solution of urea and vehicle exhaust, just can obtain NH more uniformly
3Distribute, thereby in the SCR catalyst converter and NO
xFully reaction, and then the discharge amount of reduction NOx; Also have only aqueous solution of urea fully evenly to mix, could reduce its crystallization in gas exhaust piping with vehicle exhaust.But at present adopt of automobile selective catalytic reduction device SCR system is axially perpendicular to outlet pipe and sprays more, and the aqueous solution of urea ratio is easier to bump against the outlet pipe tube wall and forms accumulation like this, is unfavorable for mixing of aqueous solution of urea and tail gas, easily forms the crystallization of urea.In addition, arrange in the diesel exhaust system 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 mixer, aqueous solution of urea and tail gas are fully mixed before entering the SCR catalyst converter, reach the purpose that significantly reduces NOx, and form urea crystals at the outlet pipe tube wall easily.
Summary of the invention
The present invention be directed to the aqueous solution of urea that automobile-used selective catalytic reduction device SCR system sprays and easily hit wall formation crystallization at exhaust wall, the mixed effect of aqueous solution of urea and vehicle exhaust is relatively poor, and CONCENTRATION DISTRIBUTION is inhomogeneous, causes NO
xConversion ratio and NH
3The unfavorable shortcoming of leakage part.And patent of the present invention is a kind of automobile exhaust pipeline static mixer, its objective is: a kind of static mixer that is used in the automobile exhaust pipeline is provided, not only can be so that the aqueous solution of urea of nozzle ejection and tail gas are mixed fully, improve the transformation efficiency of selective catalytic reduction device SCR, the crystallization of minimizing exhaust duct, can not produce very big pressure drop again.
The technological scheme that patent of the present invention adopts is:
A kind of automobile exhaust pipeline static mixer, comprise body, fin and nozzle, it is characterized in that described nozzle is arranged on the body, described fin is a monolithic construction, its middle part has a circular channel, all around for curved arc shape refluence plate and be furnished with the fluid passage.
Automobile exhaust pipeline static mixer of the present invention, direction of fluid is consistent with the spray direction of nozzle, forms flow-disturbing on spray axis, and spraying is fully mixed with vehicle exhaust.In addition, can form strong flow-disturbing, make that the spraying of wall place mixes rapidly, evaporation at the corresponding wall of spraying.Therefore, the present invention not only can be so that the aqueous solution of urea of nozzle ejection and tail gas be mixed before entering the SCR catalyst converter fully, reduce the crystallization of urea, can not produce very big pressure drop again, and be verified through the computational analysis of the FIRE of AVL special designs software at wall.
According to the present invention, described body one end links to each other with exhaust duct by 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 by dismountable mode.
According to the present invention, nozzle is arranged on the mixer rear end, has avoided deposition, crystallization on mixer, stops up the problem of exhaust duct.Nozzle location is located at the flow-disturbing active region, can allow aqueous solution of urea and tail gas mix fully.
According to the present invention, described fluid passage is 3-8, preferred 4-6, and evenly be provided with.
A kind of automobile exhaust pipeline static mixer adopts 304 above stainless steel materials to make.
Description of drawings
Fig. 1 is the automotive exhaust system structure schematic representation.
Fig. 2 is the mixer front view;
Fig. 3 is the mixer plan view;
Be labeled as in the picture in picture:; 4-1: spray discharge pattern.
Fig. 4 is spray orifice spray discharge pattern figure;
Be labeled as among the figure: 4-1: spray discharge pattern;
Fig. 5 is the plan view of the mixer of another mode of execution;
Fig. 6 is the aspect graph of Fig. 5 mode of execution spray orifice spraying.
Among the figure: 1, adpting flange; 2, body; 3, fin; 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, fluid passage; 31, circular channel; 41, spray discharge pattern.
Embodiment
Contrast accompanying drawing below, by description to embodiment, to the specific embodiment of the present invention, for example: the effect of mutual alignment relation between the shape of each structure, structure and the each several part and annexation, each several part and working principle etc. are done further detailed explanation:
The static mixer of a kind of automobile-used selective catalytic reduction device SCR of the present invention system, obtaining abundant disturbance after utilizing vehicle exhaust and aqueous solution of urea by mixer mixes, before entering the SCR catalyst converter, obtain higher uniformity, and then react fully, to reduce the content of NOx in the exhaust, can reduce the formation of urea crystals simultaneously.
With reference to Fig. 2,3,4, the static mixer of automobile-used selective catalytic reduction device SCR of the present invention system, comprise body 2, fin 3 and nozzle 4, it is characterized in that described nozzle 4 is arranged on the body 2, described fin 3 is a monolithic construction, and its middle part has a circular channel 32, all around for curved arc shape refluence plate and be furnished with fluid passage 31.Described body 2 two ends link to each other with rear end pipeline 5 with exhaust duct by adpting flange 1,9 respectively.Described nozzle 4 is arranged on the downstream of body 3.
Described fin 3 is welded on the body 2.Described fluid passage 31 is 4, and evenly distributes, and is axially consistent with spraying.
Described body 2 adopts 304 above stainless steel materials to make.
With reference to Fig. 5,6, another embodiment of the invention is that with Fig. 3 mode of execution difference described fluid passage 31 is 6, and all the other structures are identical with Fig. 3 mode of execution, also can reach identical technique effect.
Above-mentionedly in conjunction with the accompanying drawings the present invention has been carried out exemplary description, but specific implementation of the present invention is not subjected to the restriction of aforesaid way.As long as adopted the improvement of the various unsubstantialities that design of the present invention and technological scheme carry out, or design of the present invention and technological scheme are directly applied to other occasion, all within protection scope 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 (8)
1. the static mixer of an automobile-used selective catalytic reduction device SCR system, comprise body (2), fin (3) and nozzle (4), it is characterized in that described nozzle (4) is arranged on the body (2), described fin (3) is a monolithic construction, its middle part has a circular channel (32), all around for curved arc shape refluence plate and be furnished with fluid passage (31).
2. as the static mixer of the described automobile-used selective catalytic reduction device SCR of right 1 system, 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 by adpting flange (1,9) respectively.
3. as the static mixer of the described automobile-used selective catalytic reduction device SCR of right 1 system, it is characterized in that described nozzle (4) is arranged on the downstream of body (3).
4. as the static mixer of the described automobile-used selective catalytic reduction device SCR of right 1 system, it is characterized in that described fin (3) is welded on the body (2).
5. as the static mixer of the described automobile-used selective catalytic reduction device SCR of right 1 system, it is characterized in that described fluid passage (31) is 3-8, and axially consistent with spraying.
6. as the static mixer of the described automobile-used selective catalytic reduction device SCR of right 5 system, it is characterized in that described fluid passage (31) is 4-6.
7. as the static mixer of the described automobile-used selective catalytic reduction device SCR of right 5 system, it is characterized in that described fluid passage (3-1) evenly distributes.
8. as the static mixer of any one described automobile-used selective catalytic reduction device SCR system of right 1-7, it is characterized in that described body (2) adopts 304 above stainless steel materials making.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010181712XA CN102242661A (en) | 2010-05-10 | 2010-05-10 | Static mixer of vehicle selective catalytic reduction (SCR) device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010181712XA CN102242661A (en) | 2010-05-10 | 2010-05-10 | Static mixer of vehicle selective catalytic reduction (SCR) device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102242661A true CN102242661A (en) | 2011-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010181712XA Pending CN102242661A (en) | 2010-05-10 | 2010-05-10 | Static mixer of vehicle selective catalytic reduction (SCR) device |
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| CN (1) | CN102242661A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106368773A (en) * | 2016-08-30 | 2017-02-01 | 潍柴动力股份有限公司 | Engine and double-whirl mixing device thereof |
| CN110894804A (en) * | 2019-11-29 | 2020-03-20 | 安徽中鼎流体系统有限公司 | SCR mechanical pipeline assembly of automobile exhaust system |
| CN111617635A (en) * | 2020-06-16 | 2020-09-04 | 浙江天地环保科技股份有限公司 | Novel denitration reductant directly spout and mix device |
| CN112539101A (en) * | 2020-11-27 | 2021-03-23 | 潍柴动力股份有限公司 | Turbocharger |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6401455B1 (en) * | 1997-07-24 | 2002-06-11 | Siemens Aktiengesellschaft | Exhaust emission control system for the exhaust gas of a diesel engine |
| US20090230691A1 (en) * | 2007-03-23 | 2009-09-17 | Presz Jr Walter M | Wind turbine with mixers and ejectors |
| CN101649765A (en) * | 2008-07-21 | 2010-02-17 | 波森公司 | Exhaust gas system |
| CN101680422A (en) * | 2007-03-23 | 2010-03-24 | 弗洛设计风力涡轮机公司 | Wind turbine with mixers and ejectors |
| CN201687558U (en) * | 2010-05-10 | 2010-12-29 | 杭州银轮科技有限公司 | Static mixer of vehicle selective catalytic reduction device SCR |
-
2010
- 2010-05-10 CN CN201010181712XA patent/CN102242661A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6401455B1 (en) * | 1997-07-24 | 2002-06-11 | Siemens Aktiengesellschaft | Exhaust emission control system for the exhaust gas of a diesel engine |
| US20090230691A1 (en) * | 2007-03-23 | 2009-09-17 | Presz Jr Walter M | Wind turbine with mixers and ejectors |
| CN101680422A (en) * | 2007-03-23 | 2010-03-24 | 弗洛设计风力涡轮机公司 | Wind turbine with mixers and ejectors |
| CN101649765A (en) * | 2008-07-21 | 2010-02-17 | 波森公司 | Exhaust gas system |
| CN201687558U (en) * | 2010-05-10 | 2010-12-29 | 杭州银轮科技有限公司 | Static mixer of vehicle selective catalytic reduction device SCR |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106368773A (en) * | 2016-08-30 | 2017-02-01 | 潍柴动力股份有限公司 | Engine and double-whirl mixing device thereof |
| CN106368773B (en) * | 2016-08-30 | 2019-03-29 | 潍柴动力股份有限公司 | A kind of engine and its double-cyclone mixing arrangement |
| US11365666B2 (en) | 2016-08-30 | 2022-06-21 | Weichai Power Co., Ltd. | Generator and double-swirl mixing device thereof |
| CN110894804A (en) * | 2019-11-29 | 2020-03-20 | 安徽中鼎流体系统有限公司 | SCR mechanical pipeline assembly of automobile exhaust system |
| CN111617635A (en) * | 2020-06-16 | 2020-09-04 | 浙江天地环保科技股份有限公司 | Novel denitration reductant directly spout and mix device |
| CN112539101A (en) * | 2020-11-27 | 2021-03-23 | 潍柴动力股份有限公司 | Turbocharger |
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Application publication date: 20111116 |