CN202100308U - Selective catalytic reduction (SCR) system for urea solution metering injection - Google Patents
Selective catalytic reduction (SCR) system for urea solution metering injection Download PDFInfo
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- CN202100308U CN202100308U CN2011202103790U CN201120210379U CN202100308U CN 202100308 U CN202100308 U CN 202100308U CN 2011202103790 U CN2011202103790 U CN 2011202103790U CN 201120210379 U CN201120210379 U CN 201120210379U CN 202100308 U CN202100308 U CN 202100308U
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- urea
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- urea solution
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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) system for urea solution metering injection. A control unit (2) receives signals fed back by an engine working condition collecting sensor (1), a NOX sensor (9) and an exhaust temperature sensor (8). A urea supplying pump (12) is controlled to pump quantitative urea solution from a urea storage tank (11) to a pressure stabilizer (10), a urea metering injection valve (3) is controlled to inject required urea solution into a mixing device, a compressed air electromagnetic valve and a reducing valve are controlled by the control unit (2) to send the compressed air into the mixing device (5), and the injected urea solution is atomized and then injected into a catalytic device (7) through a nozzle (6). The SCR system has the advantages that under different working conditions, injecting quantity and injecting time of the urea solution can be changed, and the urea solution can be better atomized. Pyrogenic decomposition NH3 is fully reacted with NOX in exhaust gas of the engine in the catalytic device, thereby reducing the value of the NOX in the exhaust gas of the engine and reducing pollution.
Description
Technical field
The utility model relates to diesel engine exhaust after-treatment system field, relates in particular to a kind of SCR system that urea solution metering sprays that is used for of diesel engine exhaust reprocessing.
Background technique
Nitrogen oxide (NOx) discharging of adopting SCR (SCR) technology to reduce motor is a method most economical, suitable, good reliability.Use a kind of metered injection device that reducing agent (urea liquid, known brand name are AdBlue) is injected in the engine efflux for this reason, become the ammonia and the H of gaseous state through pyrolysis
2O, the reducing agent effect through ammonia makes NO
XBe reduced and generate N
2And H
2O.
Because ammonia is harmful gas, reduction reaction does not take place with NOx in the reducing agent of too much spurting into, and will enter in the atmosphere with the exhaust of motor, causes secondary environmental pollution.Therefore based on the operating mode and the warm demand of engine row of engine, realize the accurate measurement injection and fully atomize, seem of crucial importance urea liquid.
Therefore the objective of the invention is to design a kind of SCR system, satisfy the accurate measurement and good atomizing of urea liquid, prevent engine stop working simultaneously after, each passage is stopped up in the urea liquid crystallization of delay.
The model utility content
The utility model technical problem to be solved is to provide a kind of stable-pressure device that urea solution metering sprays that is used for, and according to the demand of Under Different Work Condition of Engine to aqueous solution of urea, realizes the accurate measurement injection.
The technological scheme of the utility model is following: a kind of SCR system that is used for the urea solution metering injection, its key is: comprise engine operating condition pick-up transducers, control unit, urea metering injection valve, reduction valve, mixing arrangement, nozzle, catalyst converter, NO
XSensor, stable-pressure device, urea storage box, urea supply pump, compressed air electromagnetic valve, wherein urea storage box, urea supply pump, stable-pressure device, urea metering injection valve are cascaded through pipeline successively; Said compressed air electromagnetic valve is communicated with by pipeline with reduction valve, and said urea metering injection valve and reduction valve all are communicated with mixing arrangement, and this mixing arrangement connects nozzle, and this nozzle extend in the catalyst converter, and this catalyst converter outlet end is provided with NO
XSensor and exhaust gas temperature sensor; Control unit is accepted engine operating condition pick-up transducers (1), NO
XThe signal of sensor and exhaust gas temperature sensor feedback; Control urea supply pump pumps into quantitative urea liquid to stable-pressure device from the urea storage box; Control urea metering injection valve again and spray into mixing arrangement to the urea liquid that needs; The compressed air electromagnetic valve of control unit control simultaneously, reduction valve are sent into pressurized air and are gone into mixing arrangement, and the urea liquid atomizing with spraying into sprays in the catalyst converter through nozzle again.Through before the urea liquid of SCR steady pressure of system and pressurized air mix, adding a urea solution metering injection valve; This metered injection valve is controlled through pulsewidth; Guaranteed to spray the accurate measurement of urea liquid, in addition, through pressurized air urea liquid has fully been atomized again.
Above-mentioned stable-pressure device is connected with and blows solenoid valve clearly, reduction valve through arm with blow solenoid valve clearly and be communicated with, blow solenoid valve clearly and control by control unit.Air through the steady pressure of reduction valve links to each other with stable-pressure device through blowing solenoid valve clearly, and the unlatching that solenoid valve is blown in control unit control clearly can be removed the residual urine cellulose solution in stable-pressure device and the pipeline.
Above-mentioned stable-pressure device is provided with temperature controller.Control unit avoids temperature low excessively through the temperature of temperature controller monitoring stable-pressure device and near device, and each passage is stopped up in the urea liquid crystallization.
Beneficial effect:
1, the reducing agent demand that is used for SCR (SCR) system only receives the urea-spray solenoid valve to open time length to control, and exhaust pressure does not have influence to its.
2, the urea liquid of urea liquid stable-pressure device storage preset pressure can effectively guarantee the accuracy that urea solution metering sprays.
3, adopt pressurized air that the urea liquid of metered injection is atomized, guarantee urea liquid in catalyst converter with engine exhaust in NO
xCarry out the reduction reaction of nitrogen oxide.
Through the temperature controller heating function, guarantee when lower temperature that 4, urea liquid can not stop up stable-pressure device and near device yet.
5, during engine stop working, adopt pressurized air that residual urine cellulose solution in mixing arrangement, nozzle, pressure stabilizing cavity and each pipeline of being attached thereto is cleared up, prevent that residual urine cellulose solution low temperature crystallization from stopping up each part.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further.
Embodiment
As shown in Figure 1, a kind of SCR system that is used for the urea solution metering injection is by engine operating condition pick-up transducers 1, control unit 2, urea metering injection valve 3, reduction valve 4, mixing arrangement 5, nozzle 6, catalyst converter 7, NO
XCompositions such as sensor 9, stable-pressure device 10, urea storage box 11, urea supply pump 12, compressed air electromagnetic valve 15, wherein urea storage box 11, urea supply pump 12, stable-pressure device 10, urea metering injection valve 3 are cascaded through pipeline successively; Said compressed air electromagnetic valve 15 and reduction valve 4 are communicated with by pipeline, and said urea metering injection valve 3 all is communicated with mixing arrangement 5 with reduction valve 4, these mixing arrangement 5 connection nozzles 6, and this nozzle 6 extend in the catalyst converter 7, and these catalyst converter 7 outlet end are provided with NO
XSensor 9 and exhaust gas temperature sensor 8; Control unit 2 input ends and motivation working condition acquiring sensor 1, NO
XSensor 9 links to each other with exhaust gas temperature sensor 8, control unit 2 output terminals with control urea supply pump 12, urea metering injection valve 3, compressed air electromagnetic valve 15, reduction valve 4, blow solenoid valve 14 clearly and link to each other.Control unit 2 is accepted engine operating condition pick-up transducers 1, NO
XThe signal of sensor 9 and exhaust gas temperature sensor 8 feedbacks; Control urea supply pump 12 pumps into quantitative urea liquid to stable-pressure device 10 from urea storage box 11; Control 3 urea liquids that need of urea metering injection valve again and spray into mixing arrangement; Control unit 2 control compressed air electromagnetic valves 15, reduction valve 4 send pressurized air to go into mixing arrangement 5 simultaneously, and the urea liquid atomizing with spraying into sprays in the catalyst converter 7 through nozzle 6 again.Said stable-pressure device 10 is connected with and blows solenoid valve 14 clearly, reduction valve 4 through arm with blow solenoid valve 14 clearly and be communicated with, blow solenoid valve 14 clearly by control unit 2 controls.Stable-pressure device 10 is provided with temperature controller 13.
Claims (3)
1. one kind is used for the SCR system that urea solution metering sprays, and it is characterized in that: comprise engine operating condition pick-up transducers (1), control unit (2), urea metering injection valve (3), reduction valve (4), mixing arrangement (5), nozzle (6), catalyst converter (7), NO
XSensor (9), stable-pressure device (10), urea storage box (11), urea supply pump (12), compressed air electromagnetic valve (15), wherein urea storage box (11), urea supply pump (12), stable-pressure device (10), urea metering injection valve (3) are cascaded through pipeline successively; Said compressed air electromagnetic valve (15) is communicated with by pipeline with reduction valve (4); Said urea metering injection valve (3) and reduction valve (4) all are communicated with mixing arrangement (5); This mixing arrangement (5) connects nozzle (6); This nozzle (6) extend in the catalyst converter (7), and this catalyst converter (7) outlet end is provided with NO
XSensor (9) and exhaust gas temperature sensor (8); Control unit (2) is accepted engine operating condition pick-up transducers (1), NO
XThe signal of sensor (9) and exhaust gas temperature sensor (8) feedback; Control urea supply pump (12) pumps into quantitative urea liquid to stable-pressure device (10) from urea storage box (11); Control urea metering injection valve (3) again and spray into mixing arrangement to the urea liquid of needs; The compressed air electromagnetic valve (15) of control unit (2) control simultaneously, reduction valve (4) send pressurized air to go into mixing arrangement (5); Urea liquid atomizing with spraying into sprays in the catalyst converter (7) through nozzle (6) again.
2. according to the said a kind of SCR system that urea solution metering sprays that is used for of claim 1; It is characterized in that: said stable-pressure device (10) is connected with and blows solenoid valve (14) clearly; Reduction valve (4) through arm with blow solenoid valve (14) clearly and be communicated with, blow solenoid valve (14) clearly and control by control unit (2).
3. according to the said a kind of SCR system that urea solution metering sprays that is used for of claim 1, it is characterized in that: said stable-pressure device (10) is provided with temperature controller (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202103790U CN202100308U (en) | 2011-06-21 | 2011-06-21 | Selective catalytic reduction (SCR) system for urea solution metering injection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202103790U CN202100308U (en) | 2011-06-21 | 2011-06-21 | Selective catalytic reduction (SCR) system for urea solution metering injection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202100308U true CN202100308U (en) | 2012-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202103790U Expired - Lifetime CN202100308U (en) | 2011-06-21 | 2011-06-21 | Selective catalytic reduction (SCR) system for urea solution metering injection |
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| Country | Link |
|---|---|
| CN (1) | CN202100308U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102691557A (en) * | 2012-06-13 | 2012-09-26 | 安徽艾可蓝节能环保科技有限公司 | Urea supplying unit for air-assisting type SCR (Selective Catalyst Reaction) system |
| CN102691553A (en) * | 2012-06-13 | 2012-09-26 | 安徽艾可蓝节能环保科技有限公司 | Air-assisting type SCR (Selective Catalyst Reaction) system |
| CN102748481A (en) * | 2012-07-12 | 2012-10-24 | 宁波舜田良源油嘴油泵有限公司 | Urea injection valve for SCR (Selective Catalytic Reduction) system and laser welding method thereof |
| CN104168984A (en) * | 2012-03-12 | 2014-11-26 | 捷豹路虎有限公司 | SCR treatement of engine exhaust gases using temperature control |
| CN104612791A (en) * | 2015-01-28 | 2015-05-13 | 东风商用车有限公司 | Method and system for closed-loop control of urea solution injection quantity by SCR system |
| CN104727913A (en) * | 2013-12-23 | 2015-06-24 | 现代自动车株式会社 | Method and system of determining suitability of correction for control logic of selective catalytic reduction catalyst |
| WO2016066029A1 (en) * | 2014-10-27 | 2016-05-06 | 金有纯 | Device and method for adjusting and controlling actual amount of supply of urea entering an exhaust system |
| CN106894866A (en) * | 2015-12-17 | 2017-06-27 | 沪东重机有限公司 | A kind of marine diesel NOXThe urea injection system and method for emission reduction device SCR |
| CN107559079A (en) * | 2017-10-10 | 2018-01-09 | 广西玉柴机器股份有限公司 | Diesel engine post-processing system |
| CN109252923A (en) * | 2018-09-18 | 2019-01-22 | 潍柴动力股份有限公司 | Gas helps formula urea injection system and its lower electric blowing method |
-
2011
- 2011-06-21 CN CN2011202103790U patent/CN202100308U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104168984B (en) * | 2012-03-12 | 2016-08-24 | 捷豹路虎有限公司 | Use the SCR process of temperature controlled engine exhaust |
| CN104168984A (en) * | 2012-03-12 | 2014-11-26 | 捷豹路虎有限公司 | SCR treatement of engine exhaust gases using temperature control |
| CN102691553A (en) * | 2012-06-13 | 2012-09-26 | 安徽艾可蓝节能环保科技有限公司 | Air-assisting type SCR (Selective Catalyst Reaction) system |
| CN102691557A (en) * | 2012-06-13 | 2012-09-26 | 安徽艾可蓝节能环保科技有限公司 | Urea supplying unit for air-assisting type SCR (Selective Catalyst Reaction) system |
| CN102748481A (en) * | 2012-07-12 | 2012-10-24 | 宁波舜田良源油嘴油泵有限公司 | Urea injection valve for SCR (Selective Catalytic Reduction) system and laser welding method thereof |
| CN104727913B (en) * | 2013-12-23 | 2019-05-21 | 现代自动车株式会社 | Determine the method and system of the adaptability of the correction to the control logic of catalyst converter |
| CN104727913A (en) * | 2013-12-23 | 2015-06-24 | 现代自动车株式会社 | Method and system of determining suitability of correction for control logic of selective catalytic reduction catalyst |
| WO2016066029A1 (en) * | 2014-10-27 | 2016-05-06 | 金有纯 | Device and method for adjusting and controlling actual amount of supply of urea entering an exhaust system |
| CN104612791A (en) * | 2015-01-28 | 2015-05-13 | 东风商用车有限公司 | Method and system for closed-loop control of urea solution injection quantity by SCR system |
| CN106894866A (en) * | 2015-12-17 | 2017-06-27 | 沪东重机有限公司 | A kind of marine diesel NOXThe urea injection system and method for emission reduction device SCR |
| CN107559079A (en) * | 2017-10-10 | 2018-01-09 | 广西玉柴机器股份有限公司 | Diesel engine post-processing system |
| CN109252923A (en) * | 2018-09-18 | 2019-01-22 | 潍柴动力股份有限公司 | Gas helps formula urea injection system and its lower electric blowing method |
| CN109252923B (en) * | 2018-09-18 | 2020-06-26 | 潍柴动力股份有限公司 | Air-assisted urea injection system and lower electric blowing method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120104 |