CN202162098U - Nozzle used for post-processing urea SCR (Selective Catalyst Reduction) system of diesel engine - Google Patents
Nozzle used for post-processing urea SCR (Selective Catalyst Reduction) system of diesel engine Download PDFInfo
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- CN202162098U CN202162098U CN2011202079289U CN201120207928U CN202162098U CN 202162098 U CN202162098 U CN 202162098U CN 2011202079289 U CN2011202079289 U CN 2011202079289U CN 201120207928 U CN201120207928 U CN 201120207928U CN 202162098 U CN202162098 U CN 202162098U
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- aqueous solution
- compressed air
- urea
- nozzle
- pipeline
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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 utility model discloses a nozzle used for a post-processing urea SCR (Selective Catalyst Reduction) system of a diesel engine. The nozzle comprises a urea aqueous solution circulating pipeline, a compressed air circulating pipeline, a solenoid valve, a compressed air outlet and a urea aqueous solution spray orifice; the urea aqueous solution circulating pipeline is positioned inside the compressed air circulating pipeline, and when flowing in the compressed air circulating pipeline, compressed air can cool down the solenoid valve and the urea aqueous solution pipeline; the spraying of urea aqueous solution is controlled by the solenoid valve; and when the solenoid valve is opened, the urea aqueous solution enters the urea aqueous solution circulating pipeline, then arrives at the area of the compressed air outlet and is sprayed in an exhaust pipe under the action of spray assisting of the compressed air. The nozzle has the advantages that: 1, an ejector pump with lower cost can be adopted; 2, the atomizing effect of the spraying is better so as to be favorable for catalytic conversion of SCR; 3, the compressed air can help to remove liquid drops remaining on the nozzle after spraying, thereby effectively preventing the nozzle from being crystallized and blocked; and 4, adverse consequences caused by over temperature of the solenoid valve and the urea aqueous solution can be avoided.
Description
Technical field
The utility model patent 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 utility model 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 utility model 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 utility model, 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.
The utility model has the advantages that: because the utility model nozzle 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 utility model has been 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 utility model 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 the further improvement of the utility model, 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 utility model 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 utility model 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 utility model.
Fig. 2 is used for the front view of diesel engine post processing urea SCR system nozzle for the utility model.
Fig. 3 is used for the right side view of diesel engine post processing urea SCR system nozzle for the utility model.
Among the figure; The end 10 of the The initial segment pipeline 4 of compressed air inlet 1, aqueous solution of urea inlet 2, aqueous solution of urea circulation pipeline 3, compressed air circulation pipeline, the main paragraph pipeline 5 of compressed air circulation pipeline, 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; To the specific embodiment of the utility model, 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.
Described compressed air circulation pipeline comprises the The initial segment pipeline 4 and 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; 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 by end simultaneously, and is provided with umbrella shape shower nozzle 9; Described umbrella shape shower nozzle 9 is provided with several urea 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 urea spray orifice 8 compressed-air actuated assisting down then.Compressed air gets in compressed air circulation pipeline through its inlet 1, flows to compressed air outlet 7 zones along the direction of aqueous solution of urea circulation pipeline 3, 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.The urea spray orifice of the utility model adopts beveled structure; A little central spray orifice 81 is arranged in center in umbrella shape, and 4 peripheral spray orifices 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 the explanation of the utility model, rather than to the restriction of the utility model, any utility model that does not exceed in the utility model connotation scope is created, and all falls within the protection domain of the utility model.
Claims (4)
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, it is characterized in that the described compressed air pipeline 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; Offer compressed air outlet (7) on the terminal sidewall; Should link to each other with the end of compressed air circulation pipeline by end simultaneously, and be provided with umbrella shape shower nozzle (9); Described umbrella shape shower nozzle (9) is provided with several urea 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 central spray orifice (81) and be positioned at said central spray orifice (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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202079289U CN202162098U (en) | 2011-06-20 | 2011-06-20 | Nozzle used for post-processing urea SCR (Selective Catalyst Reduction) system of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202079289U CN202162098U (en) | 2011-06-20 | 2011-06-20 | Nozzle used for post-processing urea SCR (Selective Catalyst Reduction) system of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202162098U true CN202162098U (en) | 2012-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202079289U Expired - Fee Related CN202162098U (en) | 2011-06-20 | 2011-06-20 | Nozzle used for post-processing urea SCR (Selective Catalyst Reduction) system of diesel engine |
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| CN (1) | CN202162098U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102671803A (en) * | 2012-04-28 | 2012-09-19 | 苏州市金翔钛设备有限公司 | Hydraulic ejector with blower |
| CN102755802A (en) * | 2012-07-16 | 2012-10-31 | 信义环保特种玻璃（江门）有限公司 | Broken glass wet-type dust collector |
| CN102836792A (en) * | 2011-06-20 | 2012-12-26 | 杭州银轮科技有限公司 | Spray nozzle for post-treatment urea SCR (Silicon Controlled Rectifier) system of diesel engine |
| CN104481647B (en) * | 2014-11-13 | 2017-04-05 | 重庆超力高科技股份有限公司 | A kind of accurate injection quick response has a gas formula SCR injection apparatus |
| CN107965373A (en) * | 2013-06-06 | 2018-04-27 | 康明斯排放处理公司 | The nozzle cooling system and technology of diesel exhaust gas fluid injection system |
-
2011
- 2011-06-20 CN CN2011202079289U patent/CN202162098U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102836792A (en) * | 2011-06-20 | 2012-12-26 | 杭州银轮科技有限公司 | Spray nozzle for post-treatment urea SCR (Silicon Controlled Rectifier) system of diesel engine |
| CN102671803A (en) * | 2012-04-28 | 2012-09-19 | 苏州市金翔钛设备有限公司 | Hydraulic ejector with blower |
| CN102755802A (en) * | 2012-07-16 | 2012-10-31 | 信义环保特种玻璃（江门）有限公司 | Broken glass wet-type dust collector |
| CN102755802B (en) * | 2012-07-16 | 2015-06-03 | 信义环保特种玻璃（江门）有限公司 | Broken glass wet-type dust collector |
| CN107965373A (en) * | 2013-06-06 | 2018-04-27 | 康明斯排放处理公司 | The nozzle cooling system and technology of diesel exhaust gas fluid injection system |
| CN107965373B (en) * | 2013-06-06 | 2020-04-21 | 康明斯排放处理公司 | Nozzle cooling system and technique for diesel exhaust fluid injection system |
| CN104481647B (en) * | 2014-11-13 | 2017-04-05 | 重庆超力高科技股份有限公司 | A kind of accurate injection quick response has a gas formula SCR injection apparatus |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120314 Termination date: 20200620 |
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| CF01 | Termination of patent right due to non-payment of annual fee |