CN202732051U - Reducing agent injection control device in SCR system - Google Patents
Reducing agent injection control device in SCR system Download PDFInfo
- Publication number
- CN202732051U CN202732051U CN2012204042546U CN201220404254U CN202732051U CN 202732051 U CN202732051 U CN 202732051U CN 2012204042546 U CN2012204042546 U CN 2012204042546U CN 201220404254 U CN201220404254 U CN 201220404254U CN 202732051 U CN202732051 U CN 202732051U
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- Prior art keywords
- flow pipeline
- reducing agent
- liquid
- gas
- control device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 66
- 238000002347 injection Methods 0.000 title claims abstract description 26
- 239000007924 injection Substances 0.000 title claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 93
- 239000012530 fluid Substances 0.000 claims description 11
- 238000010926 purge Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 25
- 230000002000 scavenging effect Effects 0.000 description 17
- 239000007921 spray Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 241001062009 Indigofera Species 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
Landscapes
- Exhaust Gas After Treatment (AREA)
Abstract
本实用新型揭示了一种SCR系统中的还原剂喷射控制装置，其包括储液箱，气流管路，液流管路，控制气流管路和液流管路上压缩空气和还原剂输送的控制单元，喷嘴，以及排气管；所述气流管路与一气源相连通，所述液流管路与所述储液箱相连通；所述喷嘴为真空发生器喷嘴，其与所述气流管路和液流管路相连通，在气流管路内的压缩气体经过喷嘴时会在液流管路内形成负压；所述还原剂喷射控制装置利用还原剂和压缩空气通过真空发生器喷嘴时产生的压力差作为还原剂输送的动力，简化了还原剂喷射控制装置的结构，降低了控制装置的成本，且避免了还原剂结晶堵塞喷射管路的现象，提高了控制装置的可靠性。
The utility model discloses a reducing agent injection control device in an SCR system, which includes a liquid storage tank, an air flow pipeline, a liquid flow pipeline, and a control unit for controlling the delivery of compressed air and reducing agent on the air flow pipeline and the liquid flow pipeline , a nozzle, and an exhaust pipe; the air flow pipeline is connected with an air source, and the liquid flow pipeline is connected with the liquid storage tank; the nozzle is a vacuum generator nozzle, and it is connected with the air flow pipe The road and the liquid flow pipeline are connected, and when the compressed gas in the gas flow pipeline passes through the nozzle, a negative pressure will be formed in the liquid flow pipeline; the reducing agent injection control device uses the reducing agent and compressed air to pass through the vacuum generator nozzle. The generated pressure difference is used as the driving force for reducing agent delivery, which simplifies the structure of the reducing agent injection control device, reduces the cost of the control device, avoids the phenomenon that the reducing agent crystallizes to block the injection pipeline, and improves the reliability of the control device.
Description
Technical field
The utility model relates to the SCR ejecting system in a kind of motor-vehicle tail-gas reprocessing, and the reducing agent that relates in particular in the SCR system that a kind of exhaust gas from diesel vehicle processes sprays control gear.
Background technique
Along with more and more higher to environmental protection requirement of society; country is increasing to the dynamics of environmental protection; relevant policies have been put into effect with regard to vehicular emission aspect national correlation department; especially the implementation of " state's IV standard "; stricter to vehicular emission control; need to satisfy further reduce again 30%～50% pollutant on " state III standard " basis could be up to standard, at present, some city of China has begun to carry out the exhaust emissions policy of " state's IV standard ".
Existing known, selective catalytic reduction technology (SCR) is the main flow route of motor-vehicle tail-gas post-processing technology, be about to reducing agent (being called " adding indigo plant " in the industry) by nozzle quantitative injection intake and exhaust pipeline, and pass 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, basically all be the transmitting power that needs to provide by power source (such as diaphragm pump or electromagnetic pump) reducing agent, under the control of control unit and metering valve, reducing agent in the urea box is injected in the outlet pipe by atomizer nozzle control, process tail gas in the outlet pipe is carried out catalytic reduction, and the complex structure of this control system, cost is higher, and because component are more, the potential faults of generation is also larger.
The model utility content
The purpose of this utility model is to overcome the defective of prior art, provide the reducing agent in a kind of SCR system to spray control gear, it does not need power source that the transmitting power of reducing agent is provided, but the pressure difference that produces when utilizing reducing agent and pressurized air by nozzle is carried out the conveying of reducing agent, and control system is simple in structure, and cost is lower.
For achieving the above object, the utility model proposes following technological scheme: the reducing agent in a kind of SCR system sprays control gear, comprises liquid tank, airflow pipeline, liquid flow tube road, the control unit on control airflow pipeline and liquid flow tube road, nozzle, and outlet pipe; Described airflow pipeline is connected with a source of the gas, and described liquid flow tube road is connected with described liquid tank; Described nozzle is connected with described airflow pipeline and liquid flow tube road, and the pressurized gas in airflow pipeline can form negative pressure when passing through nozzle in the liquid flow tube road; The liquid flow tube road is delivered to reducing agent in the nozzle under suction function, and be injected in the outlet pipe after pressurized gas mixes.
Further, described nozzle is the vacuum generator nozzle, comprises pneumatic duct, fluid passage pipe and the gas-liquid mixed pipe that is connected with pneumatic duct and fluid passage pipe; Described pneumatic duct and described airflow pipeline are connected, and described fluid passage pipe and described liquid flow tube road are connected, and described gas-liquid mixed pipe is used for mixed injection of reducing agent is incident upon in the described outlet pipe.
The end place that the pneumatic duct of described vacuum generator nozzle and gas-liquid mixed pipe join is formed with throttle orifice, is formed with the annular space between the pneumatic duct of throttle orifice periphery and the gas-liquid mixed pipe, and described annular space is communicated with described fluid passage pipe and gas-liquid mixing tube.
Be respectively arranged with the first solenoid valve and the second solenoid valve on described airflow pipeline and the liquid flow tube road, described airflow pipeline is connected with described source of the gas by the first solenoid valve, and described liquid flow tube road is connected with described liquid tank by the second solenoid valve.
Reducing agent in the described SCR system sprays control gear and also comprises the scavenging pipeline that is communicated with described source of the gas and liquid flow tube road.
Described scavenging pipeline is provided with the 3rd solenoid valve.
Described the first solenoid valve is five position three-way valves, and described airflow pipeline is connected on the different valve position of this five position three-way valve with scavenging pipeline.
Described source of the gas is compressed air gas source.
The pressure transducer that comprises reducing agent pressure in the monitoring liquid flow tube road in the described liquid flow tube road.
Described the first solenoid valve be connected solenoid valve and divide level signal to connect described control unit.
The emitted dose of reducing agent can recently be controlled by the duty of adjusting described the second solenoid valve on the described liquid flow tube road.
Compared with prior art, reducing agent in the SCR system that the utility model discloses sprays control gear, the power that its pressure difference that produces when utilizing reducing agent and pressurized air by the vacuum generator nozzle is carried as reducing agent, simplified the structure that reducing agent sprays control gear, reduced the cost of control gear, and at AEI After End of Injection, residual reducing agent in the pipeline is purged, avoid the phenomenon of residual reducing agent Crystallization Plugging injection line, improved the reliability of control gear.
Description of drawings
Fig. 1 is that the reducing agent in the utility model SCR system sprays control gear embodiment one schematic diagram.
Fig. 2 is vacuum generator nozzle arrangements schematic representation in the utility model.
Fig. 3 is the utility model control gear embodiment two schematic diagram.
Embodiment
Below in conjunction with accompanying drawing of the present utility model, the utility model embodiment's technological scheme is carried out clear, complete description.
Fig. 1 is the utility model the first embodiment's schematic diagram, as shown in Figure 1, ejection control device in the SCR system that the utility model discloses comprises liquid tank 1, airflow pipeline 4 and liquid flow tube road 5, pressurized air is carried out on control gas flow tube 4 and liquid flow tube road 5 and reducing agent is carried and the control unit (PCU) 6 of injection, vacuum generator nozzle 2 and outlet pipe 3, reducing agent in the utility model SCR system sprays control gear by the reducing agent in the liquid tank 1 is carried, atomizing and spraying treatment, and spray in outlet pipe 3 by vacuum generator nozzle 2, reach the effect that motor vehicle tail-gas purifying is processed.
Described airflow pipeline 4 is mainly used in compressed-air actuated conveying, itself and a compressed air gas source 41 are connected, this source of the gas 41 provides bleed pressure for airflow pipeline 4, be provided with the first solenoid valve 42 on the described airflow pipeline 4, described the first solenoid valve 42 is electrically connected control unit 6, under the SC sigmal control of control unit 6, the first solenoid valve 42 is used for the pressure size of control airflow pipeline 4 air-flows and the break-make of air-flow.
Described liquid flow tube road 5 one ends are communicated with liquid tank 1, the other end is communicated with vacuum generator nozzle 2, be provided with filter cleaner 51 and the second solenoid valve 52 on the described liquid flow tube road, liquid tank 1 is used for the storage reducing agent, described liquid flow tube road 5 is mainly used in the conveying of reducing agent, and described filter cleaner 51 is used for being drawn into the reducing agent filter cleaning on liquid flow tube road.
Described the second solenoid valve 52 is electrically connected described control unit 6, is used under the control of control unit 6, and the break-make on control liquid flow tube road 5, and under different engine and load, control unit 6 also can be according to original NO in the tail gas
xDischarge amount is adjusted the dutycycle of the second solenoid valve 52, thereby changes the emitted dose of the reducing agent that sucks, and satisfies different emitted dose demands, and described the second solenoid valve 52 can recently be controlled by adjusting its duty the emitted dose of reducing agent on the described liquid flow tube road 5.
As shown in Figure 2, described vacuum generator nozzle 2 adopts the venturi design principle, when flowing through vacuum generator nozzle 2 with certain speed, can play in air-flow the effect of speedup step-down, can in the liquid flow tube road, form negative pressure when namely the pressurized gas in airflow pipeline 4 is through vacuum generator nozzle 2, liquid flow tube road 5 is delivered to reducing agent in the vacuum generator nozzle 2 under suction function, and be injected in the outlet pipe 3 after pressurized gas mixes.Simultaneously, described vacuum generator nozzle 2 also is used for the pressurized air that liquid flow tube road 5 carries the reducing agent of coming and airflow pipeline 4 to blow is mixed, atomizes and sprays.
Specifically, described vacuum generator nozzle 2 comprises fluid passage pipe 21, pneumatic duct 22 and gas-liquid mixing tube 23, described fluid passage pipe 21 is formed with throttle orifice 25 with the end that gas-liquid mixed pipe 23 joins, and described fluid passage pipe 21 is communicated with liquid flow tube road 5, and described pneumatic duct 22 is communicated with airflow pipeline 4.Described pneumatic duct 22 extends in the described gas-liquid mixed pipe 23, form annular space 24 between the periphery of the throttle orifice 25 of described pneumatic duct 22 ends and the described gas-liquid mixed pipe 23, described annular space 24 is communicated with described fluid passage pipe 21, is used for the reducing agent in the fluid passage pipe 21 is delivered to gas-liquid mixed pipe 23.
During work, when pressurized air flows through the throttle orifice 25 of pneumatic duct 22 ends with certain speed, air pressure in the gas-liquid mixed pipe 23 in described pneumatic duct 22 downstreams descends rapidly, play the effect of speedup step-down, under the effect of pressure reduction, reducing agent is pumped into fluid passage pipe 21 in liquid tank 1, the annular space 24 of flowing through, enter in the gas-liquid mixed pipe 23, described reducing agent and pressurized air are after the 23 interior abundant mixing of gas-liquid mixed pipe, atomizing are processed, and be discharged in the outlet pipe 3, the tail gas in the outlet pipe 3 is carried out purified treatment.
Preferably, be provided with pressure transducer 53 in the described liquid flow tube road 5, described pressure transducer 53 signal connection control units 6, described pressure transducer 53 is used for the pressure of monitoring liquid flow tube road 5 interior reducing agents, plays the effect of fault diagnosis.
More preferably, reducing agent in the utility model SCR system sprays control gear and also comprises scavenging pipeline 7, described scavenging pipeline 7 is communicated with compressed air gas source 41 and described liquid flow tube road 5, specifically, described scavenging pipeline 7 one ends are communicated with the downstream of the second solenoid valve 52 on the described liquid flow tube road 5, the other end is communicated with the upstream of the first solenoid valve 42 on described airflow pipeline, described scavenging pipeline 7 can purge the reducing agent that remains in the ejecting system pipeline clean, and be provided with the 3rd solenoid valve 71 on the described scavenging pipeline 7, described scavenging pipeline is mainly used in liquid flow tube road 5 interior residual reducing agents are purged, and prevents remaining crystallization.
During injection, when control unit 6 receives the engine ignition signal, control unit 6 control the first solenoid valves 42 and the second solenoid valve 52 are communicated with respectively airflow pipeline 4 and liquid flow tube road 5, and disconnect the 3rd solenoid valve 71, when high velocity air is flowed through vacuum generator nozzle 2, pressure decreased in the gas-liquid mixed pipe 23, in the process that high velocity air constantly blows, when control unit 6 monitors pressure transducer 53 for negative pressure, reducing agent begins to be sucked and enters vacuum generator nozzle 2, and and vacuum generator nozzle 2 in pressurized air mix, atomizing is spurted in the outlet pipe 3 by vacuum generator nozzle 2 at last.
Work as AEI After End of Injection, scavenging pipeline 7 begins the reducing agent in the pipeline is purged action, control unit 6 receives and stops to spray order, this moment, the first solenoid valve 42 and the second solenoid valve 52 still were held open state, open simultaneously the 3rd solenoid valve 71, continue to provide in the compressed-air actuated situation at source of the gas, air-flow purges the reducing agent that remains in the liquid flow tube road 5 through continuing behind the scavenging pipeline 7, reducing agent in the upstream of liquid flow tube road is blown in the liquid tank 1, remaining reducing agent in another part liquid flow tube road 5 is through liquid passing channle pipe 21, annular space 24 and gas-liquid mixing tube 23 are blown in the outlet pipe 3, prevent residual reducing agent Crystallization Plugging injection line; After purging end, in order to prevent that the reducing agent in the liquid tank is backflowed by negative pressure, can close first the second solenoid valve 52 on the liquid flow tube road, then successively the first solenoid valve 42 on the closed gas flow pipeline and the 3rd solenoid valve 71 on the scavenging pipeline thoroughly purge pipeline.
Fig. 3 is the utility model the second embodiment, present embodiment and the first embodiment difference are, on scavenging pipeline 7, need not use the 3rd solenoid valve, the second solenoid valve on the airflow pipeline 4 is set to five position three-way valves 8, described scavenging pipeline 7 one ends are communicated with described liquid flow tube road 5, the other end is communicated with described five position three-way valves 8, and described five position three-way valves, 8 signals connect described control unit 6, and described five position three-way valves 8 select to be communicated with described scavenging pipeline 7 and described airflow pipeline 4 by commutation, when normal injection, disconnect scavenging pipeline 7, be communicated with airflow pipeline 4, at AEI After End of Injection, be communicated with again scavenging pipeline 7, simple in structure, control is convenient, substantially realizes spraying and purging function.
Technology contents of the present utility model and technical characteristics have disclosed as above; yet those of ordinary skill in the art still may be based on teaching of the present 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 do not deviate from replacement of the present utility model and modifications, and contained by the present patent application claim.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204042546U CN202732051U (en) | 2012-08-15 | 2012-08-15 | Reducing agent injection control device in SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204042546U CN202732051U (en) | 2012-08-15 | 2012-08-15 | Reducing agent injection control device in SCR system |
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| Publication Number | Publication Date |
|---|---|
| CN202732051U true CN202732051U (en) | 2013-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012204042546U Withdrawn - After Issue CN202732051U (en) | 2012-08-15 | 2012-08-15 | Reducing agent injection control device in SCR system |
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| CN (1) | CN202732051U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103174497A (en) * | 2012-08-15 | 2013-06-26 | 苏州派格丽减排系统有限公司 | Reductant spraying control device in selective catalytic reduction (SCR) system |
| CN105114397A (en) * | 2015-09-06 | 2015-12-02 | 哈尔滨工业大学 | Fluid artificial muscle driving and controlling system |
| 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 |
-
2012
- 2012-08-15 CN CN2012204042546U patent/CN202732051U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103174497A (en) * | 2012-08-15 | 2013-06-26 | 苏州派格丽减排系统有限公司 | Reductant spraying control device in selective catalytic reduction (SCR) system |
| CN103174497B (en) * | 2012-08-15 | 2015-09-16 | 苏州派格丽减排系统有限公司 | Reducing agent ejection control device in SCR system |
| CN105114397A (en) * | 2015-09-06 | 2015-12-02 | 哈尔滨工业大学 | Fluid artificial muscle driving and controlling system |
| 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 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130213 Effective date of abandoning: 20150916 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130213 Effective date of abandoning: 20150916 |
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| RGAV | Abandon patent right to avoid regrant |