CN102094699A - Static mixer for diesel engine urea selective catalytic reduction device - Google Patents
Static mixer for diesel engine urea selective catalytic reduction device Download PDFInfo
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- CN102094699A CN102094699A CN2010105878758A CN201010587875A CN102094699A CN 102094699 A CN102094699 A CN 102094699A CN 2010105878758 A CN2010105878758 A CN 2010105878758A CN 201010587875 A CN201010587875 A CN 201010587875A CN 102094699 A CN102094699 A CN 102094699A
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- mixer
- catalytic reduction
- selective catalytic
- reduction device
- static mixer
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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
Abstract
The invention discloses a static mixer for a diesel engine urea selective catalytic reduction device. The static mixer comprises a pipe body, a mixer tab and a nozzle. The static mixer for the diesel engine urea selective catalytic reduction device is characterized in that the nozzle is arranged at the central axis of the pipe body; the mixer tab props against the nozzle and is installed at the front end of the nozzle; and the mixer tab is of an integral bowl structure, is provided with a fan-shaped cellular fluid channel along an atomizing axis, and the middle part of the mixer tab is bulged along the reverse direction of the air stream. According to the invention, based on the properties of atomization, the mixer carries out rationalization on the air stream motion in an air exhaust pipe, thus a strong turbulent flow forms at the part, at which the atomization is the worst, on the outlet of the nozzle, but the atomization effect gets better gradually along the atomizing axis direction, and the air stream motion weakens as well. The static mixer for the diesel engine urea selective catalytic reduction device provided by the invention not only ensures that a urea water solution injected by the nozzle and the air exhaust to be mixed fully before entering an SCR (selective catalytic reduction) catalytic converter, the crystallization of the urea at a wall surface is reduced, and at the same time, the requirements of mixing and pressure dropping are satisfied through changing the main property designed parameters according to the characteristics of different engines.
Description
Technical field
Patent of the present invention relates to automobile exhaust after-treatment system field, relates to a kind of static mixer that is used for the diesel urea selective catalytic reduction device in particular.
Background technique
Selective catalytic reduction (SCR) post-processing technology is one of major technique means of present Diesel Engine Control NOx.The cardinal principle of SCR is to take in a certain amount of reducing agent in outlet pipe, and under the effect of catalyzer, redox reaction takes place the NOx in reducing agent and the exhaust, generates harmless N
2Discharge, reach the purpose that reduces the NOx discharging.Urea (Urea) is as reducibility ammonia (NH
3) carrier, advantage such as nontoxic because of having, tasteless, stable becomes the first-selected reducing agent of diesel engine for automobile SCR technology.The urea SCR post-processing technology is used the several years in Europe, is the mainstream technology route that Europe solves Europe IV/V emission request; In order to satisfy strict more EPA2010, most manufacturers of engines have been brought into use the SCR post-processing technology in the U.S.; Finished the urea SCR system that satisfies state IV Abgasgesetz in China main motor enterprise, and had increasing lift-launch SCR after-treatment system to satisfy the bus of state IV on Beijing, Shanghai and other places.Though the urea SCR system is just worldwide by promotion and application, but it is to be solved to still have a lot of problems to have, for example: how to improve the transformation efficiency of NOx during low temperature, how to reduce sediments and generate, mixes low and ammonia leakage of transformation efficiency that factor such as inhomogeneous causes or the like.
Studies show that in a large number mixer can make the urea spray droplet mix with exhaust more fully, improve mixing uniformity, accelerate the evaporation of urea droplets, promote the decomposition of urea, forming uniform ammonia distributes, thereby improve the transformation efficiency of NOx, reduce the growing amount of urea deposits thing under the low temperature, reduce ammonia and leak.But, mixer is installed in the nozzle rear end may be caused and be sprayed at the mixer place and produce crystallization, mixer is installed simultaneously also can be caused exhaust pressure to increase to influence engine power performance, so design of Mixer and application need are taken all factors into consideration crystallization, mixed effect and the pressure drop considerations of mixer.
Summary of the invention
What the present invention will solve is the problems referred to above that prior art exists, its objective is: according to the characteristic of spraying, by air motion in the mixer rationalization outlet pipe, under the pressure loss prerequisite that allows, promote the mixed effect of reducing agent ammonia, the transformation efficiency of raising NOx, and reduce sedimental growing amount and ammonia leakage.
For realizing above purpose, the technical solution used in the present invention is:
A kind of static mixer that is used for the diesel urea selective catalytic reduction device, comprise body, mixer fin and nozzle, it is characterized in that described nozzle is arranged on the body central axis, described mixer fin is near nozzle and be installed in spray nozzle front end, the mixer fin is whole bowl formula structure, it is furnished with fan-shaped cellular type fluid passage along the spray axis direction, and the middle part is protruding in the other direction along air-flow.
The static mixer that is used for the diesel urea selective catalytic reduction device of the present invention, characteristic according to spraying, by air motion in the mixer rationalization outlet pipe, form strong flow-disturbing in the poorest place of jet expansion spraying, and along the spraying axial direction, the spray atomization effect improves gradually, and air motion also weakens thereupon.Its fin middle part is along the reciprocal projection of air-flow, and bootable middle part air communication is crossed the fluid passage holes place and flowed out, thereby strengthens the atomizing effect that the nozzle exit current rate strengthens spraying.
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 at wall, can change the key property design parameter according to different engine features again simultaneously and satisfy the requirement that mixes with pressure drop, its effect is verified through the computational analysis of special designs software.
As a further improvement on the present invention, not having spray area in included spray angle opens the aperture of some and is used for adjusting the pressure drop that mixer produces according to the requirement of engine exhaust back pressure.
According to the present invention, the bowl-type degree of depth is 0-1.5 a times of pipe diameter.
According to the present invention, fan-shaped subtended angle is 20-85 °.
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, mixer is arranged on spray nozzle front 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 according to the nozzle nozzle hole number, preferred 4-6, and evenly be provided with.
The present invention is used for the static mixer of diesel urea selective catalytic reduction device, and body employing 304 and above stainless steel material are made.
Description of drawings
Fig. 1 is a diesel exhaust aftertreatment SCR system schematic.
Fig. 2 is a diesel exhaust gas pipeline system construction drawing.
Fig. 3 is the front view of mixer of the present invention.
Fig. 4 is the plan view of mixer of the present invention.
Fig. 5 is the structural representation of fin of the present invention.
Fig. 6 is spray orifice spray discharge pattern figure of the present invention.
Fig. 7 is the plan view of the mixer of another mode of execution.
Fig. 8 is the aspect graph of Fig. 7 mode of execution spray orifice spraying.
Among the figure: 1, adpting flange; 2, body; 3, mixer 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; 11, pressure drop adjustment hole; 12, intermediate projections part; 13, fluid passage; 14, 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:
A kind of static mixer that is used for the diesel urea selective catalytic reduction device of the present invention, utilize mixer to gas flow channeling conduct in the automobile exhaust pipe, on nozzle exit and spray axis direction, form strong flow-disturbing, impel aqueous solution of urea to mix with vehicle exhaust better, improve ammonia distributes in the outlet pipe uniformity and NO
XTransformation efficiency, thereby further reduce the content of NOx in the exhaust, can reduce the formation of urea crystals simultaneously.
With reference to Fig. 2, Fig. 3, the static mixer of diesel urea selective catalytic reduction device of the present invention, comprise body 2, mixer fin 3 and nozzle 4, described nozzle 4 is arranged on body 2 central axis, and 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 mixer fin 3 is welded on the body 2.Described body 2 employings 304 and above stainless steel material are made.
With reference to Fig. 4, Fig. 5 and Fig. 6, described fin 3 is whole bowl shaped structure, it is the cellular type fluid passage 13 of fan-shaped layout along the spray axis direction, its bottom 12, middle part is protruding in the other direction along air-flow, guiding middle part air-flow enters fluid passage 13, thereby strengthens the atomizing effect that the nozzle exit current rate strengthens spraying.In the present embodiment, the cross section of fin 3 is square, and evenly is separated into four fan-shaped flow channel area I, II, III, IV, and each fan-shaped flow channel area is provided with one group of through hole, described through hole ovalize, and the major axis of through hole increases progressively from the center to the edge gradually.Space between this group through hole and fin 3 and the tube wall forms a fan-shaped cellular type fluid passage 13.
Described one group of through hole also can be oval shape or arcuate structure.
Juncture area is arranged the hole 11 that is used to regulate pressure drop in adjacent fan-shaped fluid passage, can require the hole of opening suitable diameter according to the engine exhaust back pressure.
With reference to Fig. 7 and Fig. 8, another embodiment of the invention is that with Fig. 4 mode of execution difference described fluid passage is 6, and all the other structures are identical with Fig. 4 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. static mixer that is used for the diesel urea selective catalytic reduction device, comprise body (2), mixer fin (3) and nozzle (4), it is characterized in that described nozzle (4) is arranged on the body central axis, described mixer fin (3) is arranged on the upstream near nozzle (4), described mixer fin (3) is the integrated type bowl shaped structure, it is furnished with fan-shaped cellular type fluid passage (13) along the spray axis direction, and the middle part (12) of described mixer fin (3) is protruding in the other direction along air-flow.
2. the static mixer that is used for the diesel urea selective catalytic reduction device as claimed in claim 1 is characterized in that the bowl-type monolithic construction of described mixer fin (3), and its bowl-type degree of depth is a 0-1.5 times of pipe diameter.
3. the static mixer that is used for the diesel urea selective catalytic reduction device as claimed in claim 1 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.
4. the static mixer that is used for the diesel urea selective catalytic reduction device as claimed in claim 1 is characterized in that described fan-shaped cellular type fluid passage (13) 3-8, and axially consistent with spraying.
5. the static mixer that is used for the diesel urea selective catalytic reduction device as claimed in claim 4 is characterized in that described fan-shaped cellular type fluid passage (13) evenly distributes.
6. the static mixer that is used for the diesel urea selective catalytic reduction device as claimed in claim 1 is characterized in that described mixer fin (3) is provided with the hole (11) that is used to regulate the pressure drop that produces owing to mixer in no spray area.
7. the static mixer that is used for the diesel urea selective catalytic reduction device as claimed in claim 1 is characterized in that described mixer fin (3) is welded on the body.
8. as any one described static mixer that is used for the diesel urea selective catalytic reduction device of right 1-7, it is characterized in that described body (2) employing 304 and the making of above stainless steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105878758A CN102094699A (en) | 2010-12-15 | 2010-12-15 | Static mixer for diesel engine urea selective catalytic reduction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105878758A CN102094699A (en) | 2010-12-15 | 2010-12-15 | Static mixer for diesel engine urea selective catalytic reduction device |
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| CN102094699A true CN102094699A (en) | 2011-06-15 |
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| CN2010105878758A Pending CN102094699A (en) | 2010-12-15 | 2010-12-15 | Static mixer for diesel engine urea selective catalytic reduction device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041433A (en) * | 2015-09-01 | 2015-11-11 | 安徽江淮汽车股份有限公司 | Automotive SCR system |
| CN108150247A (en) * | 2016-12-05 | 2018-06-12 | 卡特彼勒公司 | Exhaust after treatment system, device and method |
| CN108757125A (en) * | 2018-06-19 | 2018-11-06 | 中国船舶重工集团柴油机有限公司 | A kind of improved selective catalytic reduction device suitable for boat diesel engine |
| CN108979803A (en) * | 2018-07-25 | 2018-12-11 | 武汉水草能源科技研发中心(有限合伙) | The method and device of liquid and gas mixing |
| CN109356696A (en) * | 2018-09-27 | 2019-02-19 | 中船动力研究院有限公司 | Threeway mixer |
| CN113606020A (en) * | 2021-07-16 | 2021-11-05 | 江苏伟博动力技术有限公司 | Gas-liquid mixer for waste gas purification |
| CN114542247A (en) * | 2022-01-18 | 2022-05-27 | 潍柴动力股份有限公司 | SCR system and engine |
Citations (5)
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| CN1985080A (en) * | 2004-07-16 | 2007-06-20 | 日产柴油机车工业株式会社 | Exhaust emission purifying apparatus for engine |
| CN201050420Y (en) * | 2007-07-06 | 2008-04-23 | 沈国军 | Adjustable automobile gas restrictor |
| EP1982756A1 (en) * | 2007-04-19 | 2008-10-22 | Magneti Marelli Sistemi di Scarico S.p.a. | An exhaust system of an internal combustion engine |
| CN101319351A (en) * | 2008-06-26 | 2008-12-10 | 常州中弘光伏有限公司 | Monocrystalline growing furnace |
| CN202028346U (en) * | 2010-12-15 | 2011-11-09 | 杭州银轮科技有限公司 | Static mixer for urea selective catalytic reduction device of diesel engine |
-
2010
- 2010-12-15 CN CN2010105878758A patent/CN102094699A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1985080A (en) * | 2004-07-16 | 2007-06-20 | 日产柴油机车工业株式会社 | Exhaust emission purifying apparatus for engine |
| EP1982756A1 (en) * | 2007-04-19 | 2008-10-22 | Magneti Marelli Sistemi di Scarico S.p.a. | An exhaust system of an internal combustion engine |
| CN201050420Y (en) * | 2007-07-06 | 2008-04-23 | 沈国军 | Adjustable automobile gas restrictor |
| CN101319351A (en) * | 2008-06-26 | 2008-12-10 | 常州中弘光伏有限公司 | Monocrystalline growing furnace |
| CN202028346U (en) * | 2010-12-15 | 2011-11-09 | 杭州银轮科技有限公司 | Static mixer for urea selective catalytic reduction device of diesel engine |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105041433A (en) * | 2015-09-01 | 2015-11-11 | 安徽江淮汽车股份有限公司 | Automotive SCR system |
| CN108150247A (en) * | 2016-12-05 | 2018-06-12 | 卡特彼勒公司 | Exhaust after treatment system, device and method |
| CN108757125A (en) * | 2018-06-19 | 2018-11-06 | 中国船舶重工集团柴油机有限公司 | A kind of improved selective catalytic reduction device suitable for boat diesel engine |
| CN108979803A (en) * | 2018-07-25 | 2018-12-11 | 武汉水草能源科技研发中心(有限合伙) | The method and device of liquid and gas mixing |
| CN108979803B (en) * | 2018-07-25 | 2023-07-25 | 武汉水草能源科技研发中心(有限合伙) | Method and device for mixing liquid and gas |
| CN109356696A (en) * | 2018-09-27 | 2019-02-19 | 中船动力研究院有限公司 | Threeway mixer |
| CN113606020A (en) * | 2021-07-16 | 2021-11-05 | 江苏伟博动力技术有限公司 | Gas-liquid mixer for waste gas purification |
| CN114542247A (en) * | 2022-01-18 | 2022-05-27 | 潍柴动力股份有限公司 | SCR system and engine |
| CN114542247B (en) * | 2022-01-18 | 2023-04-18 | 潍柴动力股份有限公司 | SCR system and engine |
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Application publication date: 20110615 |