CN202157846U - Air-assisted injection system for diesel engine post-treating urea silicon controlled rectifier (SCR) system - Google Patents
Air-assisted injection system for diesel engine post-treating urea silicon controlled rectifier (SCR) system Download PDFInfo
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- CN202157846U CN202157846U CN2011202097253U CN201120209725U CN202157846U CN 202157846 U CN202157846 U CN 202157846U CN 2011202097253 U CN2011202097253 U CN 2011202097253U CN 201120209725 U CN201120209725 U CN 201120209725U CN 202157846 U CN202157846 U CN 202157846U
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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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- 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
- Y02T10/40—Engine management systems
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Abstract
The utility model discloses an air-assisted injection system for a diesel engine post-treating urea silicon controlled rectifier (SCR) system, which comprises a urea box assembly, a urea pump assembly, a compressed air assembly, a nozzle, a sensor and a controller of the air-assisted injection system. Urea water solution is pumped to the front end of the nozzle from a urea box through the urea pump assembly after being filtered, injection quantity of the urea water solution is controlled by an electromagnetic valve arranged on the nozzle, and the electromagnetic valve is controlled by logic calculation of the controller according to sensor information and engine information in front of and at the back of an SCR catalyst. After being filtered, the compressed air is pressure-adjusted to 5-8bar by a pressure adjusting valve, and then the compressed air enters the nozzle by passing through pipelines. The electromagnetic valve and the urea water solution are cooled on the nozzle, and the urea water solution is injection-assisted at positions near the nozzle. An on-board diagnostics (OBD) function of the SCR system is achieved through the controller. The air-assisted injection system for the diesel engine post-treating urea SCR system has the advantages that cost is low, atomization effect of atomizing is good, catalytic conversion rate is high, the nozzle can not be blocked due to crystallization and the like. Moreover, over-high temperature of the electromagnetic valve and the urea water solution can be avoided.
Description
Technical field
The utility model patent relates to diesel exhaust aftertreatment system field, relates to a kind of urea-spray system that is used to reduce urea selective reduction SCR (the Selective Catalyst Reduction) system of Diesel NOx discharging in particular.
Background technique
China's large diesel engine has been implemented in full state III emission standard, and developed regions such as Beijing, Shanghai, Guangzhou have also come into effect state IV emission standard successively, and plan to implement in full in January, 2012 state IV emission standard.Compare with state III emission standard, the emission limit of the NOx of state IV emission standard descends about 30%, and the emission limit of PM descends about 60%.Be main various emission controls by improving combustion technology (like improving and optimizating of combustion manner, electric control fuel oil jet system, charge inter cooling etc.) only, be difficult to satisfy the requirement of discharging by improving diesel engine combustion.Therefore, on the basis of the advanced emission controls by improving combustion of diesel engine, increase the development trend that the exhaust aftertreatment technology becomes the control diesel emission.
According to the experience of developed country, current realization state IV emission standard mainly contains two kinds of technology path: first EGR+DPF/DOC, promptly reduces the growing amount of NOx earlier through exhaust gas recirculation, again through the grain catcher trap particulate matter.It two is SCR technology, promptly through optimized combustion, reduces the growing amount of particulate matter, allows to increase the discharge amount of NOx simultaneously, and then reduces the discharge amount of NOx through the SCR technology.Experimental result shows: state IV diesel engine using SCR technology is than adopting EGR to add particle trap technology oil consumption low about 5%.When selecting the SCR technology path to realize state IV, have reliability height, good stability, fuel consumption is low, specific power is high, the drain period is long, heat radiation requires advantages such as low, and when upgrading state V, SCR is easier than EGR.Especially the SCR technology is insensitive to the Sulpher content of fuel oil, so the SCR technology is considered to meet most one of post-processing technology China's actual conditions, that can satisfy state IV emission request.
The urea SCR ejecting 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 outlet 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 valve 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 solenoid valve on the nozzle need cool off; Usually adopt the engine cooling water cycle 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 possibly reach 500-600 ℃, therefore need take certain cooling method, 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 existing technology exists; Its objective is: help spray and air cooling effect through on the auxiliary SCR system of no air nozzle basis, having introduced pressurized air; Overcome the shortcoming of auxiliary SCR system nozzle spray effect of no air and cooling effect difference, provide a kind of air that is used for diesel engine reprocessing urea SCR system to help the spray ejecting system.
For realizing above purpose, the technological scheme that the utility model adopts is:
A kind of air that is used for diesel engine reprocessing urea SCR system helps the spray ejecting system; It comprises urea box assembly, urea pump assembly, pressurized air assembly, nozzle, sensor and controller (DCU) thereof, it is characterized in that described urea box assembly comprises urea box, urea level sensor, urea temperature transducer and strainer composition; Described urea pump assembly comprises electric-motor pump, one-way valve and filter; Described pressurized air assembly comprises filter, pressure regulator valve and first solenoid valve composition; Described nozzle is sprayed by the second electromagnetic valve aqueous solution of urea, by pressurized air aqueous solution of urea is carried out pressure and helps spray and nozzle second solenoid valve and aqueous solution of urea cooled off; Described sensor comprises temperature transducer and the NOx sensor before and after the SCR catalyst converter; Described controller (DCU) has realizes the accurately emitted dose and the OBD of the SCR system function of control aqueous solution of urea.
The air of the diesel engine reprocessing urea SCR system of the utility model helps the spray ejecting system; Aqueous solution of urea is drawn into spray nozzle front end by the urea pump assembly through filtering from urea box, carry out the emitted dose that logical calculated is controlled the electromagnetic valve aqueous solution of urea on the nozzle according to sensor information before and after the SCR catalyst converter and engine information by controller (DCU).Pressurized air to 5-8bar, gets into nozzle through pipeline by the pressure regulator valve pressure regulation through after filtering then, on nozzle, solenoid valve and aqueous solution of urea is cooled off, and near the nozzle spray orifice, aqueous solution of urea is played the spray effect that helps.Realize the SCR OBD of system function through controller (DCU).
The utility model has the advantages that: because the utility model nozzle has adopted the injection of electromagnetic valve aqueous solution of urea, so the SCR system can adopt the jet pump of lower cost.Because the utility model has been introduced pressurized air and the aqueous solution of urea of nozzle has been carried out pressure helped the spray design, therefore the atomizing effect of spraying is better, helps the catalyzed conversion effect of SCR.In addition, pressurized 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 pressurized air to the solenoid valve of nozzle with aqueous solution of urea carries out heat insulation and cooling, so can avoid solenoid valve and aqueous solution of urea temperature too high and cause adverse consequences.
As the further improvement of the utility model, described nozzle comprises aqueous solution of urea circulation pipeline and pressurized air circulation pipeline, it is characterized in that described pressurized 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 body is provided with solenoid valve and places the main paragraph pipeline of described pressurized air circulation pipeline inner; Offer compressed air outlet on the terminal sidewall; Should link to each other with the end of pressurized 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.It is inner that aqueous solution of urea circulation pipeline is positioned at pressurized air circulation pipeline, and pressurized air cools off solenoid valve and aqueous solution of urea pipeline thereof when its pipeline flows; The injection of aqueous solution of urea is by electromagnetic valve, and aqueous solution of urea got into aqueous solution of urea circulation pipeline when solenoid valve was opened, and arrived the spray orifice zone and sprayed in the outlet pipe compressed-air actuated helping under the spray effect.
Because the utility model nozzle has adopted the injection of electromagnetic valve aqueous solution of urea, so the SCR system can adopt the jet pump of lower cost.Because the utility model has been introduced pressurized 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, pressurized 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 pressurized air to the solenoid valve of nozzle with aqueous solution of urea carries out heat insulation and cooling, so can avoid solenoid valve and aqueous solution of urea temperature too high and cause adverse consequences.
As further improving again 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 outlet pipe axial direction, and the oblique outlet 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 reprocessing urea SCR system of the utility model adopts 304 or 304 above stainless steel materials to make, with high temperature and the aqueous solution of urea characteristic that is adapted to diesel exhaust gas.
Description of drawings
Fig. 1 helps the structured flowchart that sprays ejecting system for the air that the utility model is used for diesel engine reprocessing urea SCR system.
Fig. 2 helps the structure of nozzle schematic representation that sprays ejecting system for the air that the utility model is used for diesel engine reprocessing urea SCR system.
Fig. 3 is used for the front elevation of diesel engine reprocessing urea SCR system nozzle for the utility model.
Fig. 4 is used for the right side view of diesel engine reprocessing urea SCR system nozzle for the utility model.
Among the figure, the end 5010 of the aqueous solution of urea circulation pipeline of the shower nozzle 509 of the urea spray orifice 508 of the compressed air outlet 507 of the solenoid valve 506 of the pressurized air circulation pipeline 504 and 505 of the aqueous solution of urea inlet 502 of the compressed air inlet 501 of temperature transducer 7, NOx sensor 8, controller (DCU) 9, pipeline 10, strainer 11, nozzle, nozzle, nozzle aqueous solution of urea circulation pipeline 503, nozzle, nozzle, nozzle, nozzle, nozzle, nozzle, the central spray orifice 5011 of nozzle, the peripheral spray orifice 5012 of nozzle behind urea box assembly 1, urea level and temperature transducer 2, urea pump assembly 3, pressurized air assembly 4, nozzle 5, the preceding temperature transducer 6 of SCR catalyst converter, the SCR catalyst converter.
Embodiment
Contrast accompanying drawing below; Through description to embodiment; To the 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 working principle etc. are done further detailed explanation.
With reference to Fig. 1,2, a kind of air that is used for diesel engine reprocessing urea SCR system of the utility model helps the spray ejecting system, and it comprises urea box assembly 1, urea pump assembly 3, pressurized air assembly 4, nozzle 5, sensor 6,7,8 and controller (DCU) 9 thereof.
Described urea box assembly 1 is made up of urea box, urea level and temperature transducer 2, strainer 11.
Described urea pump assembly 3 is made up of the better simply electric-motor pump of structure, one-way valve, filter etc.
Described pressurized air assembly 4 is made up of filter, pressure regulator valve, solenoid valve.
Described nozzle 5 is sprayed by solenoid valve 506 control aqueous solution of urea, by pressurized air aqueous solution of urea is carried out pressure and helps spray and nozzle solenoid valve and aqueous solution of urea are cooled off.
Described sensor comprises temperature transducer 6,7 and the NOx sensor 8 before and after the SCR catalyst converter.
Described controller (DCU) 9 has realizes the accurately emitted dose and the OBD of the SCR system function of control aqueous solution of urea.
Aqueous solution of urea is drawn into spray nozzle front end by urea pump assembly 3 through filtering from urea box assembly 1, carry out the emitted dose that logical calculated is controlled the opening degree and then the control aqueous solution of urea of the solenoid valve 506 on the nozzle according to sensor 6,7 information before and after the SCR catalyst converter and engine information by controller (DCU) 9.After pressurized air is filtered by pressurized air assembly 4 processes; By the pressure regulator valve pressure regulation to 5-8bar; Get into nozzle 5 through pipeline 10 then, on nozzle 5, solenoid valve 506 and aqueous solution of urea are cooled off, and near nozzle spray orifice 5011, aqueous solution of urea is played the spray effect that helps.The atomizing effect of such spraying is better, helps the catalyzed conversion effect of SCR.In addition, pressurized 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.Realize the SCR OBD of system function through controller (DCU) 9 and urea level and temperature transducer 2, NOx sensor 8 etc. simultaneously.
With reference to Fig. 2, Fig. 3 and Fig. 4, the nozzle of the utility model, it comprises aqueous solution of urea circulation pipeline 503 and pressurized air circulation pipeline 504,505.
Described pressurized air circulation pipeline 504,505 comprises The initial segment pipeline 504 and the main paragraph pipeline 505 with compressed air inlet 501.
The top of described aqueous solution of urea circulation pipeline 3 is provided with aqueous solution of urea inlet 502; Main body is provided with solenoid valve 506, and this main body and solenoid valve 506 place in the main paragraph pipeline 505 of described pressurized air circulation pipeline 505; End is a horn mouth, offers compressed air outlet 507 on its sidewall, should link to each other with the end of pressurized air circulation pipeline 504,505 by end simultaneously, and is provided with umbrella shape shower nozzle 509; Described umbrella shape shower nozzle 509 is provided with several spray orifices 508.
Aqueous solution of urea is through its inlet 502 pipelines 503 that circulate; The amount of circulation pipeline below solenoid valve 506 control aqueous solution of urea entering; Aqueous solution of urea enters into stub area 5010 through lower end circulation pipeline, is injected to the Diesel Engine Exhaust Pipe from spray orifice 8 compressed-air actuated assisting down then.Pressurized air circulates in pipeline 504 and 505 through its inlet 501, flows to compressed air outlet 507 zones along the circulate direction of pipeline 503 of aqueous solution of urea, sprays in the Diesel Engine Exhaust Pipe at this pressing aid aqueous solution of urea.During work, pressurized air cools off aqueous solution of urea in solenoid valve 506 and the circulation pipeline 503 in the process of flowing in its circulation pipeline.The utility model spray orifice adopts beveled structure; An aperture 5011 is arranged in center in umbrella shape, and 504 apertures 5012 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 outlet pipe axial direction; The oblique outlet 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 steel materials 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 model utility that does not exceed in the utility model connotation scope is created, and all falls within the protection domain of the utility model.
Claims (5)
1. an air that is used for diesel engine reprocessing urea SCR system helps the spray ejecting system; It comprises urea box assembly (1), urea pump assembly (3), pressurized air assembly (4), nozzle (5), sensor and controller (9) thereof, and described urea box assembly (1) comprises urea box (12), urea level sensor (13), urea temperature transducer (2) and strainer (14) composition; Described urea pump assembly (3) comprises electric-motor pump (15), one-way valve (16) and first filter (17); Described pressurized air assembly (4) comprises filter (18), pressure regulator valve (19) and first solenoid valve (20) composition; Described nozzle (5) is sprayed by second solenoid valve (506) control aqueous solution of urea, by pressurized air aqueous solution of urea is carried out pressure and helps spray and nozzle second solenoid valve (506) and aqueous solution of urea are cooled off; Described sensor comprises temperature transducer (6,7) and the NOx sensor (8) before and after the SCR catalyst converter; Described controller (9) has realizes the accurately emitted dose and the OBD of the SCR system function of control aqueous solution of urea.
2. the air that is used for diesel engine reprocessing urea SCR system as claimed in claim 1 helps the spray ejecting system; It is characterized in that described nozzle comprises aqueous solution of urea circulation pipeline (503) and pressurized air circulation pipeline (504,505), it is characterized in that the described pressurized air pipeline (504,505) that circulates comprises have the compressed air inlet The initial segment pipeline (504) and the main paragraph pipeline (505) of (501); The top of described aqueous solution of urea circulation pipeline (503) is provided with aqueous solution of urea inlet (502); Main body is provided with second solenoid valve (506) and places main paragraph pipeline (505) inside of described pressurized air circulation pipeline (505); Offer compressed air outlet (507) on the terminal sidewall; Should link to each other with the end of pressurized air circulation pipeline (504,505) by end simultaneously, and be provided with umbrella shape shower nozzle (509); Described umbrella shape shower nozzle (509) is provided with several spray orifices (508).
3. the air that is used for diesel engine reprocessing urea SCR system as claimed in claim 2 helps the spray ejecting system, it is characterized in that described umbrella shape shower nozzle (509) comprise 1 center of orifices (5011) and be positioned at said center of orifices (5011) concentric circumference on one or more groups peripheral spray orifice (5012).
4. the air that is used for diesel engine reprocessing urea SCR system as claimed in claim 3 helps the spray ejecting system, it is characterized in that said every group of peripheral spray orifice (5012) is 4-6.
5. the air that is used for diesel engine reprocessing urea SCR system as claimed in claim 2 helps the spray ejecting system, it is characterized in that the end of described aqueous solution of urea circulation pipeline (503) is a horn mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202097253U CN202157846U (en) | 2011-06-20 | 2011-06-20 | Air-assisted injection system for diesel engine post-treating urea silicon controlled rectifier (SCR) system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202097253U CN202157846U (en) | 2011-06-20 | 2011-06-20 | Air-assisted injection system for diesel engine post-treating urea silicon controlled rectifier (SCR) system |
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| CN202157846U true CN202157846U (en) | 2012-03-07 |
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| CN2011202097253U Expired - Fee Related CN202157846U (en) | 2011-06-20 | 2011-06-20 | Air-assisted injection system for diesel engine post-treating urea silicon controlled rectifier (SCR) system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705047A (en) * | 2012-06-13 | 2012-10-03 | 安徽艾可蓝节能环保科技有限公司 | Air feeder for urea supplying unit |
| CN102840014A (en) * | 2011-06-20 | 2012-12-26 | 杭州银轮科技有限公司 | Air-assisted injection system for diesel engine urea after-treatment SCR (Selective Catalytic Reduction) system |
| CN104500183A (en) * | 2014-10-17 | 2015-04-08 | 武汉添蓝科技有限责任公司 | Siphon type Adblue urea adding method and device |
| CN108266252A (en) * | 2018-03-26 | 2018-07-10 | 浙江爱力浦科技股份有限公司 | A kind of air cooling air-assisted automatic control type urea liquid spraying system |
| CN115653733A (en) * | 2022-11-14 | 2023-01-31 | 烟台鲁吉汽车科技有限公司 | High-speed anti-blocking urea solution spraying and injecting device |
-
2011
- 2011-06-20 CN CN2011202097253U patent/CN202157846U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102840014A (en) * | 2011-06-20 | 2012-12-26 | 杭州银轮科技有限公司 | Air-assisted injection system for diesel engine urea after-treatment SCR (Selective Catalytic Reduction) system |
| CN102705047A (en) * | 2012-06-13 | 2012-10-03 | 安徽艾可蓝节能环保科技有限公司 | Air feeder for urea supplying unit |
| CN104500183A (en) * | 2014-10-17 | 2015-04-08 | 武汉添蓝科技有限责任公司 | Siphon type Adblue urea adding method and device |
| CN104500183B (en) * | 2014-10-17 | 2018-03-20 | 武汉添蓝发动机排放控制技术有限公司 | Hydrocone type adds blue charging method and device |
| CN108266252A (en) * | 2018-03-26 | 2018-07-10 | 浙江爱力浦科技股份有限公司 | A kind of air cooling air-assisted automatic control type urea liquid spraying system |
| CN115653733A (en) * | 2022-11-14 | 2023-01-31 | 烟台鲁吉汽车科技有限公司 | High-speed anti-blocking urea solution spraying and injecting device |
| CN115653733B (en) * | 2022-11-14 | 2023-04-04 | 烟台鲁吉汽车科技有限公司 | High-speed anti-blocking urea solution spraying and spraying device |
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Legal Events
| 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120307 Termination date: 20200620 |