CN202578854U - Selective catalytic reduction (SCR) self-priming type metering and spraying system - Google Patents
Selective catalytic reduction (SCR) self-priming type metering and spraying system Download PDFInfo
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- CN202578854U CN202578854U CN2012202376881U CN201220237688U CN202578854U CN 202578854 U CN202578854 U CN 202578854U CN 2012202376881 U CN2012202376881 U CN 2012202376881U CN 201220237688 U CN201220237688 U CN 201220237688U CN 202578854 U CN202578854 U CN 202578854U
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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 a selective catalytic reduction (SCR) self-priming type metering and spraying system, which comprises a control unit and an air flow pipeline and a liquid flow pipeline which are controlled by the control unit, wherein an air source, an electric control proportional valve and a Venturi tube are arranged on the air flow pipeline; the liquid flow pipeline comprises a urea box and an electromagnetic nozzle; the Venturi tube is connected to the liquid pipeline at the downstream of the electromagnetic nozzle; a pressure sensor is arranged at each of the upstream and the downstream of the electromagnetic nozzle; when the pressure difference between the upstream and the downstream of the electromagnetic nozzle reaches a certain value, the control unit controls the electromagnetic nozzle to meter and spray a reduction agent; and when calculating that the pressure difference between the upstream and the downstream of the electromagnetic nozzle does not reach the set value, the control unit controls the electric control proportional valve to adjust the flow speed of the air flow, so that a pressure value in the Venturi tube can be adjusted till reaching a preset spraying pressure difference. The SCR self-priming type metering and spraying system has the advantages of precise metered and sprayed amount, simple system structure and low cost.
Description
Technical field
The utility model relates to the SCR ejecting system in a kind of exhaust gas from diesel vehicle reprocessing, relates in particular to the self-priming metering injection system of a kind of SCR.
Background technique
Along with society's increasingly high to environmental protection requirement; Country is increasing to the dynamics of environmental protection, has put into effect relevant policies with regard to vehicular emission aspect national correlation department, especially the implementation of " state IV standards "; Control more becomes strict to vehicular emission; Need satisfy further reduce by 30%～50% pollutant on " state III standard " basis again could be up to standard, at present, some city of China has begun to carry out the exhaust emissions policy of " state IV standards ".
At present known, SCR technology (SCR) is the main flow route of motor-vehicle tail-gas post-processing technology, is about to reducing agent (being called " adding indigo plant " in the industry) through atomizing quantitative injection intake and exhaust pipeline, and passes through the SCR catalyzer with the main harmful gas NO in the waste gas
XChange into the nitrogen G&W and discharge, reach the purpose of tail gas clean-up.
Yet the control system of existing SCR motor-vehicle tail-gas post-processing technology is comparatively complicated, and all being basically needs to lean on power source (like diaphragm pump or electromagnetic pump) that transmitting power is provided; Under the control of control unit and metering valve; Reducing agent in the urea box is injected in the outlet pipe through atomizer nozzle, handles tail gas in the outlet pipe is carried out catalytic reduction, and after the long-term use in the pump power source under this control system; Fault is more, also increase the user cost of this system.
The model utility content
The purpose of the utility model is to overcome the defective of existing technology, and the SCR that a kind of control system is simple, measuring accuracy is high is provided self-priming metering injection system.
For realizing above-mentioned purpose; The utility model proposes following technological scheme: the self-priming metering injection system of a kind of SCR comprises control unit, by the airflow pipeline and the flow pipeline of control unit control; Said airflow pipeline is provided with source of the gas; Electronically controlled proportional valve, Venturi tube, said flow pipeline comprises urea box and electromagnetism nozzle; Said Venturi tube is connected on the flow pipeline in electromagnetism nozzle downstream, and said control unit carries out the metered injection of reducing agent according to the pressure reduction control electromagnetism nozzle of said electromagnetism nozzle upstream and downstream.
Further, said electronically controlled proportional valve is electrically connected said control unit, with pressure and the break-make of controlling air-flow in the said airflow pipeline.
The upstream and downstream of electromagnetism nozzle is respectively arranged with first pressure transducer and second pressure transducer, and said first pressure transducer and second pressure transducer are electrically connected said control unit respectively.
When the pressure difference in electromagnetism nozzle upstream and downstream reached certain value, said control unit control electromagnetism nozzle carried out reductant metering and sprays.
When the pressure reduction that calculates the pressure in electromagnetism nozzle upstream and downstream when control unit does not reach setting value, control unit will be controlled said electronically controlled proportional valve and regulate air-flow velocity, and then regulate the force value in the Venturi tube, up to reaching the preset pressure reduction that sprays.
Said Venturi tube is provided with the downstream of electronically controlled proportional valve in the airflow pipeline, is used for air-flow is carried out the speedup step-down.
The downstream of said Venturi tube also are provided with the solenoid valve of putting connection with said control unit mutually.
Said solenoid valve is the 2/2-way solenoid valve, and said 2/2-way solenoid valve can select to be communicated with said airflow pipeline and flow pipeline.
Also comprise the reducing agent filter cleaner in the said flow pipeline.
Also comprise the temperature transducer that is electrically connected with control unit in the said flow pipeline.
Compared with prior art, the self-priming metering injection system of the utility model SCR is employed in Venturi tube is set in the airflow pipeline, and Venturi tube is connected in the downstream of the electromagnetism nozzle of flow pipeline; Utilize air-flow in Venturi tube, to quicken the function of decompression, reducing agent is aspirated by Venturi tube under action of pressure, and blows to the nozzle place; In addition; Owing to adopt metering of highi degree of accuracy electromagnetism nozzle and pressure reduction control, make that this metering injection system metered injection amount is accurate, simultaneity factor is simple in structure; Required component reduce, and cost is low.
Description of drawings
Fig. 1 is the self-priming metering injection system control principle of the utility model SCR figure.
Embodiment
The accompanying drawing that will combine the utility model below carries out clear, complete description to the utility model embodiment's technological scheme.
As shown in Figure 1; The self-priming metering injection system of a kind of SCR that the utility model discloses; Through the reducing agent in the liquid tank 31 is carried, metered injection and atomizing handle, and sprays in outlet pipe 5 through urea nozzle 4, reaches the effect that motor vehicle tail-gas purifying is handled.The self-priming metering injection system of said SCR comprises airflow pipeline 2 and flow pipeline 3; And the control unit (PCU) 1 of control airflow pipeline and flow pipeline; Said airflow pipeline 2 comprises a source of the gas 21; Said source of the gas 21 is a compressed air gas source, and for pipeline provides bleed pressure, the airflow pipeline 2 that joins with source of the gas is provided with air filter 22 and electronically controlled proportional valve 23; Said electronically controlled proportional valve 23 is electrically connected control unit 1, and electronically controlled proportional valve 23 is used for controlling the pressure size of airflow pipeline 2 air-flows and the break-make of air-flow.
Also be provided with Venturi tube 24 on the airflow pipeline 2, Venturi tube 24 is arranged on electronically controlled proportional valve 23 downstream, when the air-flow in the airflow pipeline 2 is crossed Venturi tube with a velocity flow, can play the effect of speedup step-down.
Said flow pipeline 3 comprises liquid tank 31, filter cleaner 32 and electromagnetism nozzle 33, and flow pipeline 3 further is communicated with Venturi tube 24, and liquid tank 31 is used to store reducing agent; Filter cleaner 32 is used for the reducing agent filter cleaning; Electromagnetism nozzle 33 is used for the emitted dose of reducing agent is measured, and in other embodiments, electromagnetism nozzle 33 can also comprise the mixing arrangement (not shown) that reducing agent is mixed; So that being stirred, aqueous solution of urea forms uniform suspension; Reduce the crystallization risk, and help reducing agent and form uniform spraying, improve the catalytic reduction reaction effect at urea nozzle 4 places.
More preferably, on the flow pipeline 3 at electromagnetism nozzle 33 two ends, be respectively arranged with the first pressure transducer P1 and the second pressure transducer P2, the said first pressure transducer P1 and the second pressure transducer P2 are used for measuring respectively the pressure of electromagnetism nozzle 33 upstream and downstreams.Simultaneously; The first pressure transducer P1 and the second pressure transducer P2 are electrically connected control unit 1; The force value of electromagnetism nozzle 33 upstream and downstreams that control unit 1 is surveyed according to the first pressure transducer P1 and the second pressure transducer P2; Calculate the pressure difference between electromagnetism nozzle 33 upstream and downstreams, and then, reach the metered injection of accurate control reducing agent according to the unlatching pulsewidth of pressure difference control electromagnetism nozzle 33.
Preferably, also be provided with 2/2-way solenoid valve 25 in the downstream of Venturi tube, 2/2-way solenoid valve 25 is electrically connected control unit 1; During proper functioning, 2/2-way solenoid valve 25 is communicated with flow pipeline 3, after accomplishing metered injection; Can purge pipeline, the residual reducing agent in the pipeline purged totally, furtherly; After normal injection was accomplished, control unit 1 control electromagnetism nozzle 33 stopped to spray, at this moment; Electronically controlled proportional valve 23 is opened, and air-flow purges the pipeline in Venturi tube 24 and downstream thereof; When control unit 1 control 2/2-way solenoid valve 25 broke off, high velocity air oppositely purged to flow pipeline 3 through Venturi tube 24, can remove reducing agent residual in the pipeline, prevents crystallization.
Further; The self-priming metering injection system of the utility model SCR also comprises the temperature transducer T that is arranged in the flow pipeline; This temperature transducer T also is electrically connected with control unit 1, with the temperature of measuring reducing agent in the flow pipeline and transfer to control unit 1, in the lower area of temperature; Can start heating unit and carry out pipeline heating, prevent that reducing agent in the pipeline is freezing and can't work.
During injection, when control unit 1 received the engine ignition signal, control unit 1 control emptying pipeline (not shown) began the emptying action; After emptying was accomplished, control unit 1 control electronically controlled proportional valve 23 was opened, when high velocity air is flowed through Venturi tube 24; Pressure (i.e. the force value of the second pressure transducer P2) in the Venturi tube 24 reduces; The pressure of electromagnetism nozzle 33 upstream and downstreams can form a pressure reduction, and when the pressure in the Venturi tube 24 hangs down to certain value (when pressure reduction reaches setting value), control unit 1 control electromagnetism nozzle 33 is started working; When the pressure reduction that calculates when control unit 1 does not reach setting value; Control unit 1 can be regulated air-flow velocity by control electronically controlled proportional valve 23, and then regulates the force value in the Venturi tube 24, up to reaching preset pressure reduction requirement.
Under pressure reduction and the 33 metered injection effects of electromagnetism nozzle, reducing agent is sucked in the Venturi tube 24 for 31 li from liquid tank, and under the effect of high velocity air, reducing agent is spurted in the outlet pipe 5 by nozzle 4, reaches the purpose of tail gas clean-up.
The pressure that the self-priming metering injection system of SCR described in the present embodiment is controlled electronically controlled proportional valve 23 through force value and the pressure reduction of the first pressure transducer P1 and the second pressure transducer P2 is regulated and the unlatching pulsewidth of electromagnetism nozzle 33, reaches the effect of accurate measurement reducing agent spraying amount.
Technology contents of the utility model and technical characteristics have disclosed as above; Yet those of ordinary skill in the art still maybe be based on the teaching of the utility model and announcements and are done all replacement and modifications that does not deviate from the utility model spirit; Therefore; The utility model protection domain should be not limited to the content that embodiment discloses, and should comprise various replacement and the modifications that do not deviate from the utility model, and is contained by the present patent application claim.
Claims (10)
1. the self-priming metering injection system of SCR comprises control unit, by the airflow pipeline and the flow pipeline of control unit control; It is characterized in that: said airflow pipeline is provided with source of the gas; Electronically controlled proportional valve, Venturi tube, said flow pipeline comprises urea box and electromagnetism nozzle; Said Venturi tube is connected on the flow pipeline in electromagnetism nozzle downstream, and said control unit carries out the metered injection of reducing agent according to the pressure reduction control electromagnetism nozzle of said electromagnetism nozzle upstream and downstream.
2. the self-priming metering injection system of SCR according to claim 1, it is characterized in that: said electronically controlled proportional valve is electrically connected said control unit, with pressure and the break-make of controlling air-flow in the said airflow pipeline.
3. the self-priming metering injection system of SCR according to claim 1; It is characterized in that: the upstream and downstream of electromagnetism nozzle is respectively arranged with first pressure transducer and second pressure transducer, and said first pressure transducer and second pressure transducer are electrically connected said control unit respectively.
4. according to any self-priming metering injection system of described SCR of claim 1 to 3, it is characterized in that: when the pressure difference in electromagnetism nozzle upstream and downstream reached certain value, said control unit control electromagnetism nozzle carried out reductant metering and sprays.
5. according to any self-priming metering injection system of described SCR of claim 1 to 3; It is characterized in that: when the pressure reduction that calculates the pressure in electromagnetism nozzle upstream and downstream when control unit does not reach setting value; Control unit will be controlled said electronically controlled proportional valve and regulate air-flow velocity; And then the force value in the adjusting Venturi tube, up to reaching the preset pressure reduction that sprays.
6. the self-priming metering injection system of SCR according to claim 1, it is characterized in that: said Venturi tube is provided with the downstream of electronically controlled proportional valve in the airflow pipeline, is used for air-flow is carried out the speedup step-down.
7. the self-priming metering injection system of SCR according to claim 1, it is characterized in that: the downstream of said Venturi tube also are provided with the solenoid valve that is electrically connected with said control unit.
8. the self-priming metering injection system of SCR according to claim 7 is characterized in that: said solenoid valve is the 2/2-way solenoid valve, and said 2/2-way solenoid valve can select to be communicated with said airflow pipeline and flow pipeline.
9. the self-priming metering injection system of SCR according to claim 1 is characterized in that: also comprise the reducing agent filter cleaner in the said flow pipeline.
10. the self-priming metering injection system of SCR according to claim 1 is characterized in that: also comprise the temperature transducer that is electrically connected with control unit in the said flow pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202376881U CN202578854U (en) | 2012-05-24 | 2012-05-24 | Selective catalytic reduction (SCR) self-priming type metering and spraying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202376881U CN202578854U (en) | 2012-05-24 | 2012-05-24 | Selective catalytic reduction (SCR) self-priming type metering and spraying system |
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| Publication Number | Publication Date |
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| CN202578854U true CN202578854U (en) | 2012-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012202376881U Expired - Fee Related CN202578854U (en) | 2012-05-24 | 2012-05-24 | Selective catalytic reduction (SCR) self-priming type metering and spraying system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103161547A (en) * | 2012-05-24 | 2013-06-19 | 苏州派格丽减排系统有限公司 | Selective catalytic reduction (SCR) self-suction metering injection system |
| CN106437959A (en) * | 2015-08-04 | 2017-02-22 | 浙江福爱电子有限公司 | Gas-liquid mixing type SCR spraying device |
| US9670818B2 (en) | 2015-08-07 | 2017-06-06 | Caterpillar Inc. | Air-assist dosing system having priming detection |
-
2012
- 2012-05-24 CN CN2012202376881U patent/CN202578854U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103161547A (en) * | 2012-05-24 | 2013-06-19 | 苏州派格丽减排系统有限公司 | Selective catalytic reduction (SCR) self-suction metering injection system |
| CN103161547B (en) * | 2012-05-24 | 2014-12-10 | 苏州派格丽减排系统有限公司 | Selective catalytic reduction (SCR) self-suction metering injection system |
| CN106437959A (en) * | 2015-08-04 | 2017-02-22 | 浙江福爱电子有限公司 | Gas-liquid mixing type SCR spraying device |
| CN106437959B (en) * | 2015-08-04 | 2019-01-01 | 浙江福爱电子有限公司 | A kind of gas-liquid mixed SCR injection apparatus |
| US9670818B2 (en) | 2015-08-07 | 2017-06-06 | Caterpillar Inc. | Air-assist dosing system having priming detection |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 215211, No. 666 Fen Lu, Fen Hu Town, Wujiang City, Jiangsu, Suzhou Patentee after: Suzhou PowerGreen Emission Solution System Co., Ltd. Address before: 215211 Jiangsu city of Suzhou province Wujiang FENHU Economic Development Zone, the community Fen Road No. 666 Patentee before: Suzhou PowerGreen Emission Solution System Co., Ltd. |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20140524 |