CN103266938A - Gas-assisted urea injection system with mixing tube heating method adopted - Google Patents
Gas-assisted urea injection system with mixing tube heating method adopted Download PDFInfo
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- CN103266938A CN103266938A CN2013101897166A CN201310189716A CN103266938A CN 103266938 A CN103266938 A CN 103266938A CN 2013101897166 A CN2013101897166 A CN 2013101897166A CN 201310189716 A CN201310189716 A CN 201310189716A CN 103266938 A CN103266938 A CN 103266938A
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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
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Abstract
The invention discloses a gas-assisted urea injection system with a mixing tube heating method adopted, and belongs to the technical field of design of an automobile urea injection system. The gas-assisted urea injection system comprises a urea box (1), a urea box temperature and liquid level sensor (2), a heating control valve (6) and a heating water pipe (10), wherein the heating control valve (6) and the heating water pipe (10) are used for exchanging heat of the urea box (1). The gas-assisted urea injection system is characterized in that a urea metering valve (5) which is separated from a nozzle (4) is installed at the bottom of the urea box, a mixing cavity (3) is connected with the lower end of the urea metering valve (5), one end of the mixing cavity (3) is in pipeline connection with an air pipe (8) through a gas control valve (7), and the other end of the mixing cavity (3) is in pipeline connection with the nozzle (4) through a heating mixing tube (9). The gas-assisted urea injection system removes rigorous requirements for an air exhaust pipeline in the hydrolytic process of a urea solution, is simple in structure, facilitates overall arrangement, reduces crystallization risks of the urea solution, improves system reliability, breaks the situation that international suppliers monopolize, and fully plays technology and market competitiveness of independent products.
Description
Technical field:
The invention belongs to the technical field of automobile-used urea-spray system design, be particularly related to a kind of hydrolytic process of the liquid urea aqueous solution in outlet pipe of cancelling, adopt urea liquid is entered the auxiliary urea-spray system of air that outlet pipe heats, finishes before its hydrolytic process.
Background technique:
The limit value of exhaust contaminant is compared with state III Abgasgesetz in the Abgasgesetz of state's IV, state's V, and the limit value of diesel exhaust gas pollutant (mainly being particle and oxynitrides) reduces a lot.In the motor machine, be difficult to realize simultaneously reducing above-mentioned two kinds of exhaust contaminants, make engine emission reach the requirement of state's IV, state's V Abgasgesetz, therefore the SCR system becomes one of strategy of the Abgasgesetz that satisfies state's IV, state's V, the content that it can effectively reduce oxynitrides in the exhaust contaminant makes the exhaust contaminant of motor satisfy the emission regulation demands of state's IV, state's V.
Ripe at present urea liquid ejecting system all is that offshore company produces, the employing direct injection technology that has, the employing air-assisted injection technology that has, all need aqueous solution of urea in outlet pipe, to finish its hydrolysis, discharge the process of ammonia, therefore, system has strict demand for delivery temperature, nozzle riding position to the distance of catalyst converter entrance, is difficult for complete vehicle structure and arranges; Simultaneously, urea liquid is hydrolyzed in outlet pipe and easily produces urea crystals, influences exhaust back pressure and engine performance.
Summary of the invention:
The objective of the invention is to reduce the strict demand of urea nozzle fixed position on gas exhaust piping, the process of the hydrolysis in outlet pipe of cancellation aqueous solution of urea, release ammonia; Employing is heated it before urea liquid is entered outlet pipe, finishes its hydrolytic process.
A kind of auxiliary urea-spray system of gas that adopts the mixing tube heating means, by comprising urea box 1, urea box temperature and liquid level sensor 2 and the heat control valve 6 and the heating pipe 10 that are used for the urea box heat exchange, bottom at urea box directly connects ureometer metered valve 5, ureometer metered valve 5 lower ends are connected with mixing chamber 3, mixing chamber 3 one ends are connected with tracheae 8 pipelines by gas control valve 7, and the other end is connected with nozzle 4 pipelines by heating mixture pipe 9.
Described heating mixture pipe 9 heating sources can be electricity or engine exhaust.
Good effect of the present invention is: the present invention adopts heating means to the urea liquid mixture pipe, make aqueous solution of urea before entering outlet pipe, just finish its hydrolytic process, therefore cancel the requirement to delivery temperature, gas exhaust piping degree of finish, gas exhaust piping straightness accuracy, reduced risk and the gas exhaust piping manufacturing process cost of urea liquid crystallization in outlet pipe.Simple in structure, be convenient to car load and arrange, improve system reliability; Break international suppliers monopolization situation, give full play to technology and the market competitiveness from major product.
Description of drawings:
Fig. 1 is system schematic of the present invention.
Formed by urea box 1, urea box temperature and liquid level sensor 2, mixing chamber 3, urea nozzle 4, ureometer metered valve 5, heat control valve 6, gas control valve 7, tracheae 8, heating mixing tube 9 and heating pipe 10 among the figure.
Embodiment:
The present invention will be further described below in conjunction with accompanying drawing:
A kind of gas of mixing tube heating means that adopts is assisted the urea-spray system as shown in Figure 1, by comprising urea box 1, urea box temperature and liquid level sensor 2 and the heat control valve 6 and the heating pipe 10 that are used for the urea box heat exchange, the ureometer metered valve 5 that separates with nozzle 4 is housed in the bottom of urea box, ureometer metered valve 5 lower ends are connected with mixing chamber 3, mixing chamber 3 one ends are connected with tracheae 8 pipelines by gas control valve 7, and the other end is connected with nozzle 4 pipelines by heating mixing tube 9.
Described heating mixture pipe 9 heating sources can be electricity or engine exhaust.
Heating pipe can be flexible pipe or metal tube, as long as it can anti-aqueous solution of urea and anti-high temperature below 300 ℃.If heating source be electric, then resistance wire is placed in the middle of the pipeline, and the resistance wire two ends pass to the voltage resistive heater, and mixed airflow is finished hydrolytic process after being heated by the road the time; If heating source is engine exhaust, then heating mixing tube 9 needs to adopt the sleeve pipe forms, and the internal duct engine exhaust of flowing through, the gas liquid mixture of flowing through between exterior line and internal duct, gas liquid mixture are finished hydrolytic process after being heated by internal duct by the road the time.
The purpose of urea-spray system is the nitrogen oxide that reduces in the exhaust, chemical principle be aqueous solution of urea by heating hydrolysis, discharge ammonia, nitrogen oxide reflection in ammonia and the exhaust generates the nitrogen G﹠W, finally makes engine exhaust satisfy the requirement of Abgasgesetz; Therefore conventional urea-spray system need mix with exhaust, heat exchange after urea enters gas exhaust piping, and the ammonia in the aqueous solution of urea discharges the most at last, and this process is called the hydrolysis of urea process; Finish, reduce the urea crystals risk smoothly in order to guarantee the hydrolysis of urea process, need all do certain requirement to the temperature of exhaust, the degree of finish of gas exhaust piping, the straightness accuracy of gas exhaust piping, such strict demand has proposed very big challenge to the layout of car load, is unfavorable for the application of urea-spray system; The present invention adopts heating means to the urea liquid mixture pipe, make aqueous solution of urea before entering outlet pipe, just finish its hydrolytic process, therefore cancel the requirement to delivery temperature, gas exhaust piping degree of finish, gas exhaust piping straightness accuracy, reduced risk and the gas exhaust piping manufacturing process cost of urea liquid crystallization in outlet pipe.
Technological scheme of the present invention is achieved in that
Present automobile-used aqueous solution of urea has-11.5 ℃ of crystallizations and becomes solid-state physical property, because the minimum Environmental Conditions temperature of car is-40 ℃, therefore, the urea-spray system wants proper functioning between-40 ℃ and-11.5 ℃ of ambient temperatures, the urea-spray system must possess heating function, solid-state aqueous solution of urea heating and melting can be become liquid.
1, ECU is according to urea liquid temperature information in the ambient temperature of input and the urea box, and control the opening and closing of heat control valve 6 realizes thawing and add heat control urea liquid in the urea box.
2, ECU is according to the transformation efficiency demand of present engine operating mode and nitrogen oxide, determine urea target emitted dose, ECU control ureometer metered valve 5 is opened then, urea liquid flows through ureometer metered valve 5, when the urea liquid of the ureometer metered valve 5 of flowing through reaches the target emitted dose of ECU, ECU control ureometer metered valve 5 cuts out, and ECU reaches the purpose of accurate control urea-spray amount by the duration that opens of control ureometer metered valve 5.
3, behind the urea liquid arrival mixing chamber 3 by metering valve, mix with pressurized air, form even gas-liquid mixture.
4, the urea gas-liquid mixture is finished the hydrolytic process of aqueous solution of urea by the heating of heating mixing tube 9, and mixture is transported to urea nozzle 4 then, is ejected in the outlet pipe, finishes metering, hydrolysis, the course of injection of whole urea-spray system.
Because metering valve separates with nozzle, metering valve is away from nozzle, urea-spray control is with respect to the time lag that exists mixing tube 9 corresponding urea to transmit between engine exhaust, the circulation of motor dynamic operation condition down, after tested, the transformation efficiency of exhaust nitrogen oxide can satisfy state's IV, V emission regulation demands about 75%.
Claims (2)
1. one kind is adopted the gas of mixing tube heating means to assist the urea-spray system, comprise urea box (1), urea box temperature and liquid level sensor (2) and the heat control valve (6) and the heating pipe (10) that are used for the urea box heat exchange, it is characterized in that: in the bottom of urea box ureometer metered valve (5) is housed directly, ureometer metered valve (5) lower end is connected with mixing chamber (3), mixing chamber (3) one ends are connected with tracheae (8) pipeline by gas control valve (7), and the other end is connected with nozzle (4) pipeline by heating mixing tube (9).
2. a kind of gas of mixing tube heating means that adopts according to claim 1 is assisted the urea-spray system, and it is characterized in that: described heating mixing tube (9) heating source can be electricity or engine exhaust.
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| CN2013101897166A CN103266938A (en) | 2013-05-21 | 2013-05-21 | Gas-assisted urea injection system with mixing tube heating method adopted |
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| CN2013101897166A CN103266938A (en) | 2013-05-21 | 2013-05-21 | Gas-assisted urea injection system with mixing tube heating method adopted |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153497A (en) * | 2021-04-20 | 2021-07-23 | 无锡威孚力达催化净化器有限责任公司 | Self-adaptation adds fever type urea decomposition device |
| CN113217152A (en) * | 2021-06-21 | 2021-08-06 | 河北亚大汽车塑料制品有限公司 | Urea pipe unfreezing injection experiment detection equipment |
| CN113669137A (en) * | 2021-09-30 | 2021-11-19 | 潍柴动力股份有限公司 | Urea injection device, urea injection system and urea injection control method |
| CN114922720A (en) * | 2022-05-23 | 2022-08-19 | 江铃汽车股份有限公司 | Low-temperature thawing control strategy correction method for injection system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0988561A (en) * | 1995-09-29 | 1997-03-31 | Toyota Motor Corp | Electric heating type catalyst device |
| CN101300412A (en) * | 2005-09-16 | 2008-11-05 | 戴科流体技术公开有限公司 | Apparatus including heating pipe for purifying vehicle vent gas through selectivity catalytic reduction |
| US20110004392A1 (en) * | 2009-06-12 | 2011-01-06 | Denso Corporation | Apparatus for controlling the amount of waste heat of an engine |
| CN103032135A (en) * | 2011-10-02 | 2013-04-10 | 苏州派格丽减排系统有限公司 | Urea pump internally arranged type selective catalytic reduction (SCR) reducing agent storage and jetting system |
| CN203257519U (en) * | 2013-05-21 | 2013-10-30 | 中国第一汽车股份有限公司 | Gas-assisted urea injection system adopting heating method by mixing tube |
-
2013
- 2013-05-21 CN CN2013101897166A patent/CN103266938A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0988561A (en) * | 1995-09-29 | 1997-03-31 | Toyota Motor Corp | Electric heating type catalyst device |
| CN101300412A (en) * | 2005-09-16 | 2008-11-05 | 戴科流体技术公开有限公司 | Apparatus including heating pipe for purifying vehicle vent gas through selectivity catalytic reduction |
| US20110004392A1 (en) * | 2009-06-12 | 2011-01-06 | Denso Corporation | Apparatus for controlling the amount of waste heat of an engine |
| CN103032135A (en) * | 2011-10-02 | 2013-04-10 | 苏州派格丽减排系统有限公司 | Urea pump internally arranged type selective catalytic reduction (SCR) reducing agent storage and jetting system |
| CN203257519U (en) * | 2013-05-21 | 2013-10-30 | 中国第一汽车股份有限公司 | Gas-assisted urea injection system adopting heating method by mixing tube |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153497A (en) * | 2021-04-20 | 2021-07-23 | 无锡威孚力达催化净化器有限责任公司 | Self-adaptation adds fever type urea decomposition device |
| CN113217152A (en) * | 2021-06-21 | 2021-08-06 | 河北亚大汽车塑料制品有限公司 | Urea pipe unfreezing injection experiment detection equipment |
| CN113669137A (en) * | 2021-09-30 | 2021-11-19 | 潍柴动力股份有限公司 | Urea injection device, urea injection system and urea injection control method |
| CN114922720A (en) * | 2022-05-23 | 2022-08-19 | 江铃汽车股份有限公司 | Low-temperature thawing control strategy correction method for injection system |
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Application publication date: 20130828 |