CN102836792A - Spray nozzle for post-treatment urea SCR (Silicon Controlled Rectifier) system of diesel engine - Google Patents
Spray nozzle for post-treatment urea SCR (Silicon Controlled Rectifier) system of diesel engine Download PDFInfo
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- CN102836792A CN102836792A CN2011101657040A CN201110165704A CN102836792A CN 102836792 A CN102836792 A CN 102836792A CN 2011101657040 A CN2011101657040 A CN 2011101657040A CN 201110165704 A CN201110165704 A CN 201110165704A CN 102836792 A CN102836792 A CN 102836792A
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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
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- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention discloses a spray nozzle for a post-treatment urea SCR (Silicon Controlled Rectifier) system of a diesel engine. The spray nozzle comprises a urea aqueous solution circulating pipeline, a compressed air circulating pipeline, a solenoid valve, a compressed air outlet, a urea aqueous solution spray hole and the like, wherein the urea aqueous solution circulating pipeline is arranged inside the compressed air circulating pipeline, so that the compressed air cools the solenoid valve and the urea aqueous solution pipeline while flowing in the pipeline; the spraying of the urea aqueous solution is controlled by the solenoid valve; when the solenoid valve is opened, the urea aqueous solution enters the urea aqueous solution circulating pipeline, and reaches the compressed air outlet area, so as to spray to an air discharge tube under the action of the assisted spraying of the compressed air. The spray nozzle has the advantages that: 1, a low-cost injection pump can be used; 2, the atomizing effect of the sprayed mist is better to be beneficial to the SCR catalytic conversion effect; 3, the compressed air is conducive to clearing liquid drops left on the spay nozzle after spraying, thereby effectively preventing the spray nozzle against crystallization and blocking; 4, bad consequences caused by excessively high temperature of the solenoid valve and the urea aqueous solution can be avoided.
Description
Technical field
Patent of the present invention relates to diesel exhaust aftertreatment system field, relates to a kind of urea nozzle that is used to reduce urea selective reduction SCR (the Selective Catalyst Reduction) system of Diesel NOx discharging in particular.
Background technology
SCR (SCR) is that the minimizing Diesel NOx of generally acknowledging is at present discharged the most effectively one of post-processing technology, also is considered to meet most one of post-processing technology China's actual conditions, that can satisfy state IV emission request.Urea SCR is through spraying into the certain amount of urea aqueous solution in blast pipe, aqueous solution of urea obtains reducing agent NH through pervaporation, pyrolysis and hydrolytic process again
3, NH
3Under the effect of catalyst, optionally NOx is reduced into N
2Thereby realization reduces the content of NOx in the exhaust.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.; Accomplished the urea SCR system that satisfies state IV Abgasgesetz in China main engine enterprise, and in Beijing, ground such as Shanghai, Guangzhou have had increasing lift-launch SCR after-treatment system to satisfy the bus of state IV.
The urea SCR spraying system of extensive use at present mainly is divided into two types: air-assisted injection system and no air-assisted injection system.The auxiliary SCR system of air generally accomplishes aqueous solution of urea and compressed-air actuated mixing in the urea-spray pump; Both mixtures are sprayed onto in the blast pipe along pipeline and nozzle under compressed-air actuated pressure then; The SCR system nozzle arrangements of this form is simple, the spray atomization effect better, be difficult for stopping up, but it is higher to the having relatively high expectations of urea-spray pump, cost.The auxiliary SCR system of no air is general direct to set up pressure through urea pump, controls the injection of aqueous solution of urea then through the electromagnetic type nozzle that is installed in exhaust wall.The SCR system jet pump of this form simple in structure, cost is lower; But nozzle arrangements more complicated; Especially the magnetic valve on the nozzle need cool off; Usually adopt the engine cooling water circulation that nozzle is cooled off at present, in addition because the atomizing effect of no air booster action spraying is also relatively poor.
In addition, it is local-crystalized that the generation of chemical reaction formation polymer can take place when temperature is too high in pipeline and nozzle aqueous solution of urea, can influence the function even the plug nozzle of nozzle behind the long time integration.The temperature of the aqueous solution of urea of nozzle interior preferably remains on below 95 ℃ in practical application.Because the general delivery temperature of diesel engine when high load capacity possibly reach 500-600 ℃, therefore need take certain cooling provision, in order to avoid aqueous solution of urea is overheated.
Summary of the invention
What the present invention will solve is the above-mentioned defective that prior art exists; Its objective is: help spray and air cooling effect through on the auxiliary SCR system of no air nozzle basis, having introduced compressed air; Overcome the shortcoming of auxiliary SCR system nozzle spray effect of no air and cooling effect difference, a kind of nozzle of novel diesel engine post processing urea SCR system is provided.
For realizing above purpose, the technical scheme that the present invention adopts is:
A kind of nozzle that is used for diesel engine post processing urea SCR system, it comprises aqueous solution of urea circulation pipeline and compressed air circulation pipeline, it is characterized in that described compressed air circulation pipeline comprises The initial segment pipeline and the main paragraph pipeline with compressed air inlet; The top of described aqueous solution of urea circulation pipeline is provided with the aqueous solution of urea inlet; Main part is provided with magnetic valve and places the main paragraph pipeline of described compressed air circulation pipeline inner; Offer compressed air outlet on the terminal sidewall; Should link to each other with the end of compressed air circulation pipeline by end simultaneously, and be provided with the umbrella shape shower nozzle; Described umbrella shape shower nozzle is provided with several spray orifices.
The nozzle that is used for diesel engine post processing urea SCR system of the present invention, it is inner that aqueous solution of urea circulation pipeline is positioned at compressed air circulation pipeline, and compressed air cools off magnetic valve and aqueous solution of urea pipeline thereof when its pipeline flows; The injection of aqueous solution of urea is by solenoid control, and aqueous solution of urea got into aqueous solution of urea circulation pipeline when magnetic valve was opened, and arrived the spray orifice zone and sprayed in the blast pipe compressed-air actuated helping under the spray effect.
Advantage of the present invention is: because nozzle of the present invention has adopted the injection of solenoid control aqueous solution of urea, so the SCR system can adopt the jet pump of lower cost.Because the present invention has introduced compressed air and the aqueous solution of urea of nozzle has been carried out pressure helped spray and umbrella shape sprinkler design, therefore the atomizing effect of spraying is better, helps the catalyzed conversion effect of SCR.In addition, compressed air helps to clear up and sprays the residual droplets of accomplishing on the rear nozzle and can effectively avoid the nozzle crystallization to stop up.Since the present invention adopted compressed air to the magnetic valve of nozzle with aqueous solution of urea carries out heat insulation and cooling, so can avoid magnetic valve and aqueous solution of urea temperature too high and cause adverse consequences.
As further improvement of the present invention, described umbrella shape shower nozzle comprise 1 center of orifices be positioned at said center of orifices concentric circumference on one or more groups peripheral spray orifice.Center of orifices is sprayed along the blast pipe axial direction, and the oblique blast pipe direction of peripheral spray orifice is sprayed, and makes the atomizing effect of aqueous solution of urea of ejection better, has further reduced the phenomenon that aqueous solution of urea is run into exhaust wall simultaneously.Said every group of peripheral spray orifice is advisable with 4-6.
As the present invention's improvement further, the end of described aqueous solution of urea circulation pipeline is a horn mouth, can be connected with the umbrella shape shower nozzle better, also helps compressed-air actuated importing simultaneously.
A kind of aqueous solution of urea circulation shell and monolithic case that is used for the nozzle of diesel engine post processing urea SCR system of the present invention adopts 304 or 304 above stainless steels to make, with high temperature and the aqueous solution of urea characteristic that is adapted to diesel exhaust gas.
Description of drawings
Fig. 1 is used for diesel engine post processing urea SCR system structure of nozzle for the present invention.
Fig. 2 is used for the front view of diesel engine post processing urea SCR system nozzle for the present invention.
Fig. 3 is used for the right side view of diesel engine post processing urea SCR system nozzle for the present invention.
Among the figure; The end 10 of compressed air inlet 1, aqueous solution of urea inlet 2, aqueous solution of urea circulation pipeline 3, compressed air circulation pipeline 4 and 5, magnetic valve 6, compressed air outlet 7, urea spray orifice 8, shower nozzle 9, aqueous solution of urea circulation pipeline, central spray orifice 81, peripheral spray orifice 82.
The specific embodiment
Contrast accompanying drawing below; Through description to embodiment; Specific embodiments of the 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 operation principle etc. are done further detailed explanation.
A kind of nozzle that is used for diesel engine post processing urea SCR system, it comprises aqueous solution of urea circulation pipeline 3 and compressed air circulation pipeline 4,5.
Described compressed air circulation pipeline 4,5 comprises The initial segment pipeline 4 and the main paragraph pipeline 5 with compressed air inlet 1.
The top of described aqueous solution of urea circulation pipeline 3 is provided with aqueous solution of urea inlet 2; Main part is provided with magnetic valve 6, and this main part and magnetic valve 6 place in the main paragraph pipeline 5 of described compressed air circulation pipeline 5; End is a horn mouth, offers compressed air outlet 7 on its sidewall, should link to each other with the end of compressed air circulation pipeline 4,5 by end simultaneously, and is provided with umbrella shape shower nozzle 9; Described umbrella shape shower nozzle 9 is provided with several spray orifices 8.
Aqueous solution of urea is through its inlet 2 pipelines 3 that circulate; The amount of circulation pipeline below magnetic valve 6 control aqueous solution of urea entering; Aqueous solution of urea enters into stub area 10 through lower end circulation pipeline, is injected to the Diesel Engine Exhaust Pipe from spray orifice 8 compressed-air actuated assisting down then.Compressed air circulates in pipeline 4 and 5 through its inlet 1, flows to compressed air outlet 7 zones along the circulate direction of pipeline 3 of aqueous solution of urea, sprays in the Diesel Engine Exhaust Pipe at this pressing aid aqueous solution of urea.During work, compressed air cools off aqueous solution of urea in magnetic valve 6 and the circulation pipeline 3 in the process of flowing in its circulation pipeline.Spray orifice of the present invention adopts beveled structure; An aperture 81 is arranged in center in umbrella shape, and 4 apertures 82 of circumferential directions on the outer peripheral areas inclined-plane form 5 bundle sprayings like this; The centre is a branch of sprays along the blast pipe axial direction; The oblique blast pipe direction of other 4 bundles is sprayed, and can produce materialization effect preferably like this, has reduced the phenomenon that aqueous solution of urea is run into exhaust wall simultaneously.
The aqueous solution of urea circulation shell of nozzle and monolithic case adopt 304 or 304 above stainless steels to make, with high temperature and the aqueous solution of urea characteristic that is adapted to diesel exhaust gas.
What should be understood that is: the foregoing description is just to explanation of the present invention, rather than limitation of the present invention, and any innovation and creation that do not exceed in the connotation scope of the present invention all fall within protection scope of the present invention.
Claims (5)
1. nozzle that is used for diesel engine post processing urea SCR system; Comprise aqueous solution of urea circulation pipeline (3) and compressed air circulation pipeline (4,5), it is characterized in that the described compressed air pipeline (4,5) that circulates comprises have the compressed air inlet The initial segment pipeline (4) and the main paragraph pipeline (5) of (1); The top of described aqueous solution of urea circulation pipeline (3) is provided with aqueous solution of urea inlet (2); Main part is provided with magnetic valve (6) and places main paragraph pipeline (5) inside of described compressed air circulation pipeline (5); Offer compressed air outlet (7) on the terminal sidewall; Should link to each other with the end of compressed air circulation pipeline (4,5) by end simultaneously, and be provided with umbrella shape shower nozzle (9); Described umbrella shape shower nozzle (9) is provided with several spray orifices (8).
2. the nozzle that is used for diesel engine post processing urea SCR system as claimed in claim 1, it is characterized in that described umbrella shape shower nozzle (9) comprise 1 center of orifices (81) and be positioned at said center of orifices (81) concentric circumference on one or more groups peripheral spray orifice (82).
3. the nozzle that is used for diesel engine post processing urea SCR system as claimed in claim 2 is characterized in that said every group of peripheral spray orifice (82) is 4-6.
4. the nozzle that is used for diesel engine post processing urea SCR system as claimed in claim 1 is characterized in that the end of described aqueous solution of urea circulation pipeline (3) is a horn mouth.
5. like any one described nozzle that is used for diesel engine post processing urea SCR system of claim 1-4, it is characterized in that aqueous solution of urea circulation shell and monolithic case adopt 304 or 304 above stainless steels to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101657040A CN102836792A (en) | 2011-06-20 | 2011-06-20 | Spray nozzle for post-treatment urea SCR (Silicon Controlled Rectifier) system of diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101657040A CN102836792A (en) | 2011-06-20 | 2011-06-20 | Spray nozzle for post-treatment urea SCR (Silicon Controlled Rectifier) system of diesel engine |
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| CN102836792A true CN102836792A (en) | 2012-12-26 |
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| CN2011101657040A Pending CN102836792A (en) | 2011-06-20 | 2011-06-20 | Spray nozzle for post-treatment urea SCR (Silicon Controlled Rectifier) system of diesel engine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521373A (en) * | 2013-10-21 | 2014-01-22 | 芜湖鼎恒材料技术有限公司 | Cooling device for nozzle of supersonic processing device |
| CN103537390A (en) * | 2013-10-21 | 2014-01-29 | 芜湖鼎恒材料技术有限公司 | Supersonic processing nozzle good in radiating performance |
| CN103775177A (en) * | 2014-02-26 | 2014-05-07 | 周洪昌 | Heavy truck diesel-driven air-assisted atomized SCR (Selective Catalytic Reduction) urea solution injection system |
| CN106121783A (en) * | 2016-06-29 | 2016-11-16 | 中国北方发动机研究所(天津) | A kind of air mixing atomizing nozzle of SCR |
| CN106468201A (en) * | 2015-08-17 | 2017-03-01 | 浙江福爱电子有限公司 | A kind of hot environment liquid injection apparatus |
| CN106523100A (en) * | 2016-12-19 | 2017-03-22 | 凯龙高科技股份有限公司 | Axial injection urea injector |
| CN109772607A (en) * | 2019-03-13 | 2019-05-21 | 大连大学 | Nozzle structure applied to installation for fermenting |
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| US5044555A (en) * | 1990-07-23 | 1991-09-03 | Herrmidifier Company, Inc. | Self-cleaning solenoid controlled water spray nozzle and valve assembly |
| CN201129202Y (en) * | 2007-12-14 | 2008-10-08 | 中国第一汽车集团公司 | Carbamide reducing reagent nozzle with auxiliary cooling function |
| CN101491794A (en) * | 2009-01-08 | 2009-07-29 | 浙江大学 | High-speed jet gas-liquid mixing-phase ejector |
| CN202162098U (en) * | 2011-06-20 | 2012-03-14 | 杭州银轮科技有限公司 | Nozzle used for post-processing urea SCR (Selective Catalyst Reduction) system of diesel engine |
-
2011
- 2011-06-20 CN CN2011101657040A patent/CN102836792A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5044555A (en) * | 1990-07-23 | 1991-09-03 | Herrmidifier Company, Inc. | Self-cleaning solenoid controlled water spray nozzle and valve assembly |
| CN201129202Y (en) * | 2007-12-14 | 2008-10-08 | 中国第一汽车集团公司 | Carbamide reducing reagent nozzle with auxiliary cooling function |
| CN101491794A (en) * | 2009-01-08 | 2009-07-29 | 浙江大学 | High-speed jet gas-liquid mixing-phase ejector |
| CN202162098U (en) * | 2011-06-20 | 2012-03-14 | 杭州银轮科技有限公司 | Nozzle used for post-processing urea SCR (Selective Catalyst Reduction) system of diesel engine |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103521373A (en) * | 2013-10-21 | 2014-01-22 | 芜湖鼎恒材料技术有限公司 | Cooling device for nozzle of supersonic processing device |
| CN103537390A (en) * | 2013-10-21 | 2014-01-29 | 芜湖鼎恒材料技术有限公司 | Supersonic processing nozzle good in radiating performance |
| CN103521373B (en) * | 2013-10-21 | 2015-08-19 | 芜湖鼎恒材料技术有限公司 | A kind of heat abstractor of supersonic speed treatment facility nozzle |
| CN103537390B (en) * | 2013-10-21 | 2015-10-28 | 芜湖鼎瀚再制造技术有限公司 | A kind of supersonic speed process nozzle of perfect heat-dissipating |
| CN103775177A (en) * | 2014-02-26 | 2014-05-07 | 周洪昌 | Heavy truck diesel-driven air-assisted atomized SCR (Selective Catalytic Reduction) urea solution injection system |
| CN106468201A (en) * | 2015-08-17 | 2017-03-01 | 浙江福爱电子有限公司 | A kind of hot environment liquid injection apparatus |
| CN106468201B (en) * | 2015-08-17 | 2019-08-23 | 浙江福爱电子有限公司 | A kind of hot environment liquid injection apparatus |
| CN106121783A (en) * | 2016-06-29 | 2016-11-16 | 中国北方发动机研究所(天津) | A kind of air mixing atomizing nozzle of SCR |
| CN106523100A (en) * | 2016-12-19 | 2017-03-22 | 凯龙高科技股份有限公司 | Axial injection urea injector |
| CN109772607A (en) * | 2019-03-13 | 2019-05-21 | 大连大学 | Nozzle structure applied to installation for fermenting |
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Application publication date: 20121226 |