CN101922336A - Four-valve injection method of urea reducing agent - Google Patents
Four-valve injection method of urea reducing agent Download PDFInfo
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- CN101922336A CN101922336A CN2010102771087A CN201010277108A CN101922336A CN 101922336 A CN101922336 A CN 101922336A CN 2010102771087 A CN2010102771087 A CN 2010102771087A CN 201010277108 A CN201010277108 A CN 201010277108A CN 101922336 A CN101922336 A CN 101922336A
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- flow control
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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 invention relates to a four-valve injection method of a urea reducing agent, which is characterized in that liquid in a urea reducing agent box flows through a filter via a pipeline under the pressure drive, the pipeline is connected with the filter in series, four electromagnetic flow control valves are connected on the pipeline which flows through the filter in parallel, single one or two or three or four lines flowing through the electromagnetic flow control valves are converged to a pressure-stabilizing valve 18, and then the liquid is conveyed to a spray nozzle 10 of the urea reducing agent from the pressure-stabilizing valve 18 and injected into an exhaust pipe 22 under the air assistance. The four-valve injection method can solve the problem of the dosage of the original urea reducing agent by adopting the conventional industrial electromagnetic flow control valves according to different control logics, thereby having very high reliability and practical value.
Description
Technical field:
The present invention relates to a kind of four-valve injection method of carbamide reducing agent, be applied to the reprocessing field of vehicle exhaust.
Background technique:
In the coming years, the car manufactures, particularly US and European in the whole world will forcibly be implemented some severeer specifications about the emission compliance aspect of automobile nitrogen oxide NOx and particulate PM, for example, and Europe 5 and Europe 6 emission standards.
Under the pressure of Abgasgesetz, external automobile-used heavy-duty diesel engine just constantly carries out technology upgrading and improvement on the one hand, on the other hand, select appropriate post-processing technology strategy and equipment, for example, SCR (Selective Catalytic Reduction) catalyzed conversion reduction technique, DPF(Diesel Particulate Filter) particle trap, DOC(Diesel Oxidation Catalyst) oxidation catalyst etc.
The essence of SCR technology is to utilize urea at high temperature to decomposite NH
3, as the NH of reducing agent
3With the NO in the engine exhaust
xUnder the comprehensive function of catalyzer and temperature, react, generate nontoxic N under the desirable operating mode
2And H
2O, thus reach the purpose of purification.The SCR technology began abroad the denitration technology that the stationary source as power station etc. uses and has carried out exploitation and extensive use from the seventies.For tackling the requirement of new environmental regulation, abroad the SCR technology successfully has been transplanted on the diesel car since 90 years, and the corresponding exploitation checking of having carried out SCR catalyst process technology and carbamide reducing agent, realized industrial applications, for example, European and Japanese.At present, Ou Zhou most of MANUFACTURER have begun adamantine employing SCR technology and have realized Europe 4 and Europe 5 standards.For example, in the main commercial vehicle company of 7 families in Europe, there are 5 families (wearing gram, Reynolds, IVECO, Volvo and daf) to select the SCR technology to reach Europe 4 and Europe 5 standards.Other two families (Scania and graceful) then tend to the EGR technology, but also do not repel the SCR technology.With Dai Ke group is example, from January, 2005, just releases the Actros board heavy duty truck that satisfies Europe 4 and Europe 5 standards, and gives a fashionable name ' BlueTec '.The post processing mode of BlueTec all adopts the SCR technology.Result of study according to Dai Ke shows that the SCR technology is compared with the automobile of Europe 3 standard levels, can save fuel oil 3～6%, NO
xDischarging can be lower than Europe 4 limit values, as SCR is further optimized, reach Europe 6 limit values also without a doubt.
The external reason of so hankering after the SCR technology mainly is that SCR has lot of advantages, for example, can have 50～85% NO in the scope of 250～550 ℃ of the delivery temperatures of diesel-oil vehicle
xRemove efficient, and can effectively reduce the emission level of PM; SCR can easily satisfy Europe 4 and Europe 5 levels, also has the potentiality that reach Europe 6 levels; Reach the SCR technology that adopt in Europe 4 at present, the fuel oil consumption of motor can reduce by 3～6%; The SCR catalyzer does not contain precious metal, and is more relatively low than cost; SCR is to the quality of fuel oil for vehicles, and particularly Sulpher content is insensitive.Based on above analysis, the SCR post-processing technology is the vehicle condition and the fuel oil for vehicles situation of suitable China also.
If applied the vehicle-mounted SCR post-processing technology in China in 2008, must resolve the vital technological difficulties such as atomized spray, SCR catalyzer conversion efficiency, ammonia amount of leakage of dosage, the carbamide reducing agent of carbamide reducing agent supply, carbamide reducing agent.The premises all relates to the problem of carbamide reducing agent.In these problems, the jet atomization strategy of carbamide reducing agent is a key point.It relates to the problems such as blockage problem, catalyst activity problem, reducing agent efficient, ammonia escape and secondary pollution control of catalyst surface.
For the vehicle of estimating to realize state's 4 dischargings, its motor has been finished the optimization in the machine, NO
xEliminating rate can satisfy state's 4 emission standards, NO 35 ~ 40%
xEliminating rate can satisfy state's 5 emission standards 65 ~ 70%.The SCR after-treatment device just can be used as state's 4 0vehicle marketings only to need to connect upward in the imagination, and the problem of in fact facing is far above this; Adopt the SCR after-treatment device of a whole set of import, cost up to 12000 ~ 15000 yuan/cover, and urea-spray and control section just account for 2500 ~ 4000 yuan, and in case damage, can not guarantee to keep in good repair, must integral replacing, expense user is difficult to bear; But, can only adopt the crucial part of setting up of import urea-spray and control, be equipped with domestic SCR after-treatment device, at this moment, urea-spray and control section just can have been bought with regard to the cost that must spend 3500 ~ 5000 yuan.Urea-spray and control section definitely are the key and the cores of SCR reprocessing complexes.
To marking urea-spray and the control section in the external SCR after-treatment device, technical approach difference that each family adopts, existing independently urea-spray and control section, the transport urea reducing agent is to nozzle then; Also handlebar urea-spray and control section are integrated on the urea reducing agent nozzle, and its purpose all is that the tail gas that provides of timely and appropriate discovery is removed NO
xNeeded carbamide reducing agent.For example, carry out according to the curve A of theoretical discharge rate, or carry out according to the curve B that is lower than theoretical value.
The technology that the needed carbamide reducing agent of tail gas is provided of the timely and appropriate discovery of urea-spray and control section can adopt the accurate electromagnetic mass flowmeter that is connected on the urea pipe to realize, also can adopt accurate Electromagnetic Flow control valve to realize.
In fact, the Electromagnetic Flow control valve that precision is high can be realized the function of accurate electromagnetic mass flowmeter fully.
Accurate electromagnetic mass flowmeter to little range is tested, and relies on the NO in delivery temperature or the tail gas
xLevel is controlled open degree as analog amount, can meet the demands fully, but, the accurate electromagnetic mass flowmeter of present little range 100% is the import product almost, its price is usually about 20000 ~ 30000 yuan/, car load factory and car load user can't bear, the accurate electromagnetic mass flowmeter or the blank spot of homemade little range.In the future also having product emerges.
Electromagnetic Flow control valve to the precision of little range is tested, and relies on the NO in delivery temperature or the tail gas
xLevel is controlled open degree as analog amount, can meet the demands fully, but, the Electromagnetic Flow control valve of the precision of present little range 100% also is the import product almost, its price is usually about 8000 ~ 15000 yuan/, car load factory and car load user can't bear, the Electromagnetic Flow control valve or the blank spot of the precision of homemade little range.Along with the raising of domestic manufacturing industry integral level, the Electromagnetic Flow control valve of the precision of this homemade little range will emerge, and estimates that its price is below 1500 yuan/.
The Electromagnetic Flow control valve that the precision of homemade little range is not too high has a large amount of market supplies, and price is very cheap, about 120 yuan/of average costs.The not too high main cause of Electromagnetic Flow control valve precision of homemade little range is that the material of the critical movements parts of spool is selected and machining accuracy differs bigger abroad together, measured result shows, the trueness error of the flow of the Electromagnetic Flow control valve of homemade little range about ± 30%.
For example, in the urea reducing agent spraying and control of reality, according to control strategy, the flow of carbamide reducing agent changes between 5 ~ 85g/min.Realize control if select a not too high Electromagnetic Flow control valve of homemade precision, the flow of theory setting is 5 ~ 85g/min, the reducing agent supply that needs 60g/min when certain operating mode, according to its error, its real range of flow may reach 42 ~ 78g/min, for the flow of 42g/min, possible result is the supply deficiency of carbamide reducing agent, can't remove the NO of established amount
xAnd for the flow of 78g/min, possible result is that the supply of carbamide reducing agent exceeds standard, though can remove the NO of established amount
x, still, be bound to cause NH
3Excessive escape, form new pollution.
The patent No. is CN200510129691.6's ' being used to control the system to the urea supply of SCR catalyzer ' patent, the patent No. is CN200510136379.X's the patent of ' a kind of reducing agent of controlling sprays into the method in the NOx exhaust flow of containing from internal-combustion engine ', the patent No. is the device of a kind of engine exhaust gas system flow improver additive that is used for distributing of CN200810095099.2 ' ' patent, the patent No. is CN200920045181.4's the patent of ' a kind of injection of SCR reaction device spray ammonia mixed organization ', the patent No. is controlling method and the control gear that blue injected volume is added in the control used in a kind of SCR system of diesel engine of CN200810047114.6 ' ' patent, the patent No. is CN98805246.6's the patent of ' a kind of minimizing and the method for the NOx discharge amount of the fuel-lean combustion motor that waste gas system is associated ', the patent No. is CN200580030812.X's the patent of ' control system that is used for engine aftertreatment system ', the patent No. is CN200480017220.X's the patents such as patent of ' control reducing agent add method ', and the signal that only relates to carbamide reducing agent dosage obtains and strategy, the position that carbamide reducing agent sprays into, the shape of spout, pipeline, aspects such as hybrid mode, the working control way and the means of metering are not proposed.
Summary of the invention:
The object of the present invention is to provide a kind of four-valve injection method of carbamide reducing agent, can satisfy state's 4 above SCR standard-requireds, be unlikely to produce NH again
3The escape amount can be cancelled the DOC device that NH3 is carried out oxidation processes, simplifies vehicle configuration, reduces cost.
Technological scheme of the present invention is achieved in that the four-valve injection method of carbamide reducing agent, it is characterized in that: the liquid of carbamide reducing agent case under pressure-driven through the pipeline filter of flowing through, pipeline and filter are for being connected in series, four the Electromagnetic Flow control valves in parallel on the pipeline of filter of flowing through, four Electromagnetic Flow control valves or be pooled to pressure maintaining valve alone or two or three or both of flowing through, be transported to urea reducing agent nozzle from pressure maintaining valve then, under air is auxiliary, be ejected in the outlet pipe.
Described four Electromagnetic Flow control valves are from temperature transducer or NO
xThe signal imitation amount of sensor, feed back to control unit, control unit is according to independent respectively of starting in four Electromagnetic Flow control valves of the control logic of setting, or start in four Electromagnetic Flow control valves two simultaneously, or start in four Electromagnetic Flow control valves three simultaneously, or start four Electromagnetic Flow control valves simultaneously, and constitute the control platform of 14 stoichiometric levels, form an approximate parabolical curve C.
Good effect of the present invention is, adopts conventional industrial electro magnetic flow control valve, according to different control logics, has solved former problem with carbamide reducing agent dosage, has very high reliability and use value.
Description of drawings:
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a parabolical plotted curve of the present invention;
Embodiment:
The present invention will be further described below in conjunction with drawings and Examples:As shown in Figure 1, the four-valve injection method of carbamide reducing agent, it is characterized in that: the liquid of carbamide reducing agent case 2 under pressure-driven through pipeline 1 filter 12 of flowing through, pipeline 1 and filter 12 are connected, flow through filter 12 pipeline respectively with Electromagnetic Flow control valve 3, Electromagnetic Flow control valve 4, Electromagnetic Flow control valve 5 and 6 parallel connections of Electromagnetic Flow control valve, the Electromagnetic Flow control valve 3 of flowing through, Electromagnetic Flow control valve 4, the liquid of Electromagnetic Flow control valve 5 and Electromagnetic Flow control valve 6, or separately, or be pooled to pressure maintaining valve 8 simultaneously, be transported to urea reducing agent nozzle 10 from pressure maintaining valve 8 then, under air is auxiliary, be ejected in the outlet pipe 13.
Embodiment 1
As shown in Figure 2, be described with aerodynamic ejecting system so that air is auxiliary; From temperature transducer 7 or NO
xThe signal imitation amount of sensor 9 feeds back to control unit 11, and control unit 11 starts Electromagnetic Flow control valve 3 respectively separately according to the control logic of setting, or Electromagnetic Flow control valve 4, or Electromagnetic Flow control valve 5, or Electromagnetic Flow control valve 6; The dosage level of carbamide reducing agent is respectively C
0, C
1, C
2And C
3The supply dosage of the carbamide reducing agent of small flow in satisfying.
Embodiment 2
From temperature transducer 7 or NO
xThe signal imitation amount of sensor 9, feed back to control unit 11, control unit 11 starts Electromagnetic Flow control valve 3 and 4 respectively simultaneously according to the control logic of setting, or Electromagnetic Flow control valve 3 and 5, or Electromagnetic Flow control valve 3 and 6, or Electromagnetic Flow control valve 4 and 5, or Electromagnetic Flow control valve 4 and 6, or Electromagnetic Flow control valve 5 and 6; The dosage level of carbamide reducing agent is respectively C
4, C
5, C
5+1, C
5+2, C
5+3And C
5+4The supply dosage of the carbamide reducing agent of flow in satisfying.
Embodiment 3
From temperature transducer 7 or NO
xThe signal imitation amount of sensor 9 feeds back to control unit 11, and control unit 11 is according to the control logic of setting or start Electromagnetic Flow control valve 3,4 and 5 simultaneously; Or start Electromagnetic Flow control valve 3,4 and 6 simultaneously; Or start Electromagnetic Flow control valve 4,5 and 6 simultaneously; Or start Electromagnetic Flow control valve 3,5 and 6 simultaneously; The dosage level of carbamide reducing agent is respectively C
5+5, C
5+6, C
5+7And C
5+8Satisfy the supply dosage of the carbamide reducing agent of big flow.
Embodiment 4
From temperature transducer 7 or NO
xThe signal imitation amount of sensor 9 feeds back to control unit 11, and control unit 11 is according to the control logic of setting or start Electromagnetic Flow control valve 3,4,5 and 6 simultaneously; The dosage level of carbamide reducing agent is C
iSatisfy the supply dosage of the carbamide reducing agent of peak rate of flow.
Claims (2)
1. the four-valve injection method of carbamide reducing agent, it is characterized in that: the liquid of carbamide reducing agent case under pressure-driven through the pipeline filter of flowing through, pipeline and filter are for being connected in series, four the Electromagnetic Flow control valves in parallel on the pipeline of filter of flowing through, four Electromagnetic Flow control valves or be pooled to pressure maintaining valve 18 alone or two or three or both of flowing through, be transported to urea reducing agent nozzle 10 from pressure maintaining valve 18 then, under air is auxiliary, be ejected in the outlet pipe 22.
2.
According to claim 1The four-valve injection method of carbamide reducing agent, it is characterized in that the signal imitation amount of described four Electromagnetic Flow control valves from temperature transducer or NOX sensor, feed back to control unit, control unit is according to independent respectively of starting in four Electromagnetic Flow control valves of the control logic of setting, or start in four Electromagnetic Flow control valves two simultaneously, or start in four Electromagnetic Flow control valves three simultaneously, or start four Electromagnetic Flow control valves simultaneously, constitute the control platform of 14 stoichiometric levels, form an approximate parabolical curve C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102771087A CN101922336A (en) | 2010-09-09 | 2010-09-09 | Four-valve injection method of urea reducing agent |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102771087A CN101922336A (en) | 2010-09-09 | 2010-09-09 | Four-valve injection method of urea reducing agent |
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| Publication Number | Publication Date |
|---|---|
| CN101922336A true CN101922336A (en) | 2010-12-22 |
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ID=43337503
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102771087A Pending CN101922336A (en) | 2010-09-09 | 2010-09-09 | Four-valve injection method of urea reducing agent |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736523A (en) * | 2012-07-10 | 2012-10-17 | 天津亿利汽车环保科技有限公司 | Analog controller of engine |
| CN111287824A (en) * | 2020-02-21 | 2020-06-16 | 无锡威孚力达催化净化器有限责任公司 | Control method, device and system for urea pump in air-assisted SCR system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3728557A1 (en) * | 1987-08-27 | 1989-03-09 | Didier Eng | Process for the distribution of ammonia in a gas stream and apparatus for carrying out the process |
| US6125629A (en) * | 1998-11-13 | 2000-10-03 | Engelhard Corporation | Staged reductant injection for improved NOx reduction |
| US20030033799A1 (en) * | 2001-08-09 | 2003-02-20 | Gerd Scheying | Exhaust gas treatment unit and measuring instrument for ascertaining a concentration of a urea-water solution |
| CN101793183A (en) * | 2010-03-13 | 2010-08-04 | 中国第一汽车集团公司 | Jet control system utilizing air power to atomize urea reductant |
-
2010
- 2010-09-09 CN CN2010102771087A patent/CN101922336A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3728557A1 (en) * | 1987-08-27 | 1989-03-09 | Didier Eng | Process for the distribution of ammonia in a gas stream and apparatus for carrying out the process |
| US6125629A (en) * | 1998-11-13 | 2000-10-03 | Engelhard Corporation | Staged reductant injection for improved NOx reduction |
| US20030033799A1 (en) * | 2001-08-09 | 2003-02-20 | Gerd Scheying | Exhaust gas treatment unit and measuring instrument for ascertaining a concentration of a urea-water solution |
| CN101793183A (en) * | 2010-03-13 | 2010-08-04 | 中国第一汽车集团公司 | Jet control system utilizing air power to atomize urea reductant |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736523A (en) * | 2012-07-10 | 2012-10-17 | 天津亿利汽车环保科技有限公司 | Analog controller of engine |
| CN111287824A (en) * | 2020-02-21 | 2020-06-16 | 无锡威孚力达催化净化器有限责任公司 | Control method, device and system for urea pump in air-assisted SCR system |
| CN111287824B (en) * | 2020-02-21 | 2022-04-12 | 无锡威孚力达催化净化器有限责任公司 | Control method, device and system for urea pump in air-assisted SCR system |
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Application publication date: 20101222 |