CN102242658A - Urea injection system by adopting gas pressure source - Google Patents
Urea injection system by adopting gas pressure source Download PDFInfo
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- CN102242658A CN102242658A CN2010101771747A CN201010177174A CN102242658A CN 102242658 A CN102242658 A CN 102242658A CN 2010101771747 A CN2010101771747 A CN 2010101771747A CN 201010177174 A CN201010177174 A CN 201010177174A CN 102242658 A CN102242658 A CN 102242658A
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- urea
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- pressure source
- spray system
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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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- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to a urea injection system by adopting a gas pressure source. The system is characterized by comprising a urea jar, a filter, a urea nozzle, a pressure sensor, a temperature sensor and an electric control unit, wherein the system comprises a gas pressure source and a pressure regulating stabilizer which are connected with the main pipeline of the system; the urea solution for injection is pressurized by utilizing the stable gas pressure; and an electric urea pump is not arranged in the system. The system provided by the invention has the advantages of simple structure, stable pressure and high injection metering accuracy.
Description
Technical field
The present invention relates to a kind of urea-spray system that is used for diesel exhaust aftertreatment, it belongs to the internal-combustion engines exhaust gas purifying system; More particularly, relate to a kind of employing gas pressure source and spray urea liquid, be used to reduce SCR (the Selective Catalyst Reduction) selective catalytic reduction system operating of Diesel NOx discharging to diesel engine exhaust system.
Background technique
In order to realize urea-spray, existing SCR urea-spray system generally adopts DC electropump that urea liquid is pressurizeed.All need be in automobile and other car and boat by storage battery to this motor-drive pump power supply, the loss that has strengthened the storage battery electric energy.The prior art that has also adopts the electric heater heating urea solution as CN1965153A (WO2005/106220) patent of Japanese Bosch Corp., has more strengthened the loss of storage battery electric energy.Indivedual prior aries have been announced a kind of urea solution jet system that has source of the gas as the US6273120B1 patent specification of Siemens.Wherein urea liquid sprays under the booster action of air, but still adopts electronic urea pump to pressurize to urea liquid, and the energy consumption of battery is still quite big.And, because the pressure surge of urea pump, the accuracy of emitted dose and less stable.
International standard ISO22241-1 has stipulated to be used for the quality requirement of the NOx reducing agent AUS32 of diesel engine.This is that a kind of urea content is 32.5% aqueous solution of urea, and its FCTA temprature is-11.5 ℃.In order to prevent that temperature from crossing that urea liquid freezes when low, need to adopt heater that urea liquid is heated.Prior art all adopts electrically heated method, to heating installation power supply, has increased the energy consumption of storage battery by storage battery.
Prior art generally is directly installed on urea nozzle the mixer place on the engine exhaust pipe.Because delivery temperature is very high, can cause urea nozzle to cross cause thermal damage.The US6279603B1 patent of U.S.'s clean diesel technology (Clean Diesel Technologies) company has proposed to utilize the technological scheme of urea liquid cooling urea nozzle.Urea liquid after heating flows back to urea box, has brought into play the effect of heating urea solution.But too high when ambient temperature, or heat effect crosses when strong, is necessary to cool off urea liquid, in order to avoid cross thermolysis, emits ammonia.Prior art does not provide feasible cooling means as yet at present.
Summary of the invention
In order to solve the too high problem of prior art storage battery energy consumption, the invention provides a kind of SCR urea-spray system of new employing gas pressure source.
The technical solution adopted in the present invention is: design a kind of SCR urea-spray system that is used for diesel exhaust aftertreatment, it comprises urea tank, filter, urea nozzle, pressure transducer, temperature transducer, ECU (Electrical Control Unit), be primarily characterized in that: comprise a gas pressure source and a voltage regulating and stabilizing device that links to each other with the system main pipe in the system, utilize stable gas pressure to the urea liquid pressurization that is used to spray, electronic urea pump is not set in the system.The above-mentioned gas pressure source is divided into two kinds: a kind of is high-pressure gas cylinder, for example high-pressure nitrogen bottle.Its pressure is generally 15～50MPa, reaches as high as more than the 100MPa, and its advantage is that volume is less.Because be subjected to the restriction of relevant high-pressure bottle rules safe in utilization, the urea-spray system of this employing high-pressure gas cylinder only is applicable to the special vehicle of aviation and guided missile observing and controlling aspect.Second kind of gas pressure source comprises mini air compressor and compressed air reservoir, wherein the outlet pressure of air compressor 8kgf/cm normally
2(0.8MPa).This scheme is applicable to various car and boat, and the automobile for adopting pneumatic brake can utilize original air compressor and gas holder.
1. other technologies feature of the present invention is: described urea tank is a pressurized container, provides pressure by gas pressure source, and the working pressure of urea tank is 0.5～1.0MPa.Temperature transducer, liquid level sensor are housed on described urea tank and utilize the heat exchanger of engine exhaust heating urea solution; Above-mentioned heat exchanger is made up of suction tude, heat dissipating pipe and steam outlet pipe, is fixed on the urea tank bottom; Suction tude is connected with waste pipe, and the heater switch solenoid valve is installed on the pipeline, and part waste gas is introduced in the above-mentioned heat exchanger, and waste gas is discharged by steam outlet pipe after having heated urea liquid.In addition, comprise the urea nozzle cooling unit in described urea-spray system, it is made up of cooling body, chilling temperature control valve, coolant entrance, coolant outlet; Coolant entrance and coolant outlet are connected with the aircondition of automobile respectively, utilize car air conditioner coolant cools urea nozzle.Also having a feature is that gas pressure source pressure, spraying urea liquid injection pressure, the urea liquid temperature in the system, the parameters such as liquid level of urea tank all feed back to ECU (Electrical Control Unit), and by the temperature that ECU (Electrical Control Unit) is regulated urea liquid according to the program control heater switch solenoid valve of setting, the aperture of controlling the chilling temperature control valve is regulated the temperature of urea nozzle.
Advantage of the present invention and beneficial effect are: at first, owing to adopted gas pressure source and voltage regulating and stabilizing device to control the jet pressure of urea liquid in the urea-spray system, so can make the pressure stability of urea nozzle ingress, reduced the pipe internal pressure ripple that the urea liquid impulse jet causes significantly, eliminated the adverse effect of transient pressure ripple the urea nozzle emitted dose.Thereby the metering accuracy and the stability of urea solution jet amount have been improved significantly.Secondly, the present invention has adopted the heat exchanger that utilizes the engine exhaust heating urea solution and has utilized the cooling unit of car air conditioner coolant cools urea nozzle, can control the temperature of urea liquid again by ECU (Electrical Control Unit), thereby realize the target of system optimization control.
Description of drawings
The present invention is further illustrated below in conjunction with drawings and Examples.
Fig. 1 is the system schematic that the present invention adopts high-pressure nitrogen bottle.
Fig. 2 is the system schematic that the present invention adopts air compressor and gas holder.
Fig. 3 is the urea tank that heating equipment is housed.
Among the figure 8, high-pressure nitrogen bottle, 9, urea tank, 10, gas holder, 11, gas charging valve, 12, reduction valve, 13, ECU (Electrical Control Unit), 14, pressure transducer, 15, liquid level sensor, 16, temperature transducer, 17, the heater switch solenoid valve, 18, exhaust gas entrance pipe, 19, heat dissipating pipe, 20, the urea tank switch valve, 21, filter, 22, urea nozzle, 23, the cooling body, 24, coolant control valve, 25, coolant inlet tube, 26, coolant outlet pipe, 27, outlet pipe.
Embodiment
The present invention is a kind of urea-spray system that adopts gas pressure source, and wherein gas pressure source can be a kind of high-pressure gas cylinder, or air compressor and gas holder.First kind of embodiment as shown in Figure 1.High-pressure gas cylinder among this embodiment is a high-pressure nitrogen bottle 8, working pressure 35MPa.Second kind of embodiment as shown in Figure 2.In Fig. 2, inflate to gas holder 10 through gas charging valve 11 by mini air compressor, as gas pressure source.Working pressure is 0.8MPa.Two kinds of embodiments are except that gas pressure source difference, and the working principle of remaining part is identical.Urea liquid by international standard ISO22241-1 preparation is stored in the urea tank 9.Urea tank 9 is a pressurized container, and by the gas pressure source pressurization, the urea tank volume that present embodiment is selected for use is 40L.Under the effect of pressure, urea liquid enters urea nozzle 22 through urea tank switch valve 20 and filter 21, under the control of ECU (Electrical Control Unit) 13, quantitative urea liquid is sprayed in the exhaust, urea liquid is hydrolyzed to ammonia at a certain temperature, ammonia is reduced to nitrogen with the discharging of the NOx in the exhaust under catalyst action, reach the effect that reduces NOx in the exhaust.Urea cooling unit 30 is made of coolant inlet tube 25, coolant control valve 24, coolant outlet pipe 26 and cooling body 23, is used for cooling off directly linking to each other and temperature rising urea nozzle 22 with engine exhaust pipe 27.Coolant inlet tube 25 links to each other with the high-voltage tube of car air conditioner, and coolant outlet pipe 26 links to each other with the air-conditioning low-voltage tube.Heat-operated valve 24 is realized the urea nozzle temperature controlling by the amount of regulating freezing mixture by ECU (Electrical Control Unit) control aperture, prevents urea nozzle 22 cause thermal damage excessively.Pressure transducer 14 is installed on the urea tank 9, measures the pressure of urea liquid and feed back to ECU (Electrical Control Unit); Liquid level sensor 15 is installed on urea tank, measures the liquid level of urea liquid; Temperature transducer 16 also is housed on urea tank, measures the temperature of urea liquid and feed back to ECU (Electrical Control Unit); Adopt the temperature of waste heating urea liquid, heat exchanger is made up of heater switch valve 17, exhaust gas entrance pipe 18 and heat dissipating pipe 19, is fixed on the urea liquid lower box part; Suction tude is connected with waste pipe, and the heater switch solenoid valve is installed on the pipeline, and part waste gas is introduced in the above-mentioned heat exchanger, and waste gas is discharged by outlet pipe 27 after having heated urea liquid.
Fig. 3 is the urea tank that heating equipment is housed.The keying of urea nozzle 22 is controlled by ECU (Electrical Control Unit), sprays.Decide the emitted dose of urea liquid by the opening time of control urea nozzle.Various signals such as the oil temperature that records on signal that pressure transducer 14, temperature transducer 15 record among native system Fig. 3 and the motor, water temperature, load, rotating speed are transferred to engine electric-controlled unit 13 together.And then according to the injecting times of the control signal control urea nozzle 22 of ECU (Electrical Control Unit) output and emitted dose, the switch of heater switch solenoid valve 17, the aperture of coolant control valve 24.The control gear of urea-spray system and controlling method belong to prior art among the present invention, therefore no longer describe in detail in this manual.
Claims (7)
1. urea-spray system that adopts gas pressure source, comprise urea tank, filter, urea nozzle, pressure transducer, temperature transducer, ECU (Electrical Control Unit), it is characterized in that: comprise a gas pressure source and a voltage regulating and stabilizing device that links to each other with the system main pipe in the system, utilize stable gas pressure to the urea liquid pressurization that is used to spray, electronic urea pump is not set in the system.
2. the urea-spray system of employing gas pressure source according to claim 1 is characterized in that the gas pressure source that is adopted is a kind of high-pressure gas cylinder.
3. the urea-spray system of employing gas pressure source according to claim 1 is characterized in that the gas pressure source that is adopted comprises mini air compressor and compressed air reservoir.
4. the urea-spray system of employing gas pressure source according to claim 1 is characterized in that described urea tank is a pressurized container, provides pressure by gas pressure source, and the working pressure of urea tank is 0.5～1.0MPa.
5. the urea-spray system of employing gas pressure source according to claim 1, the heat exchanger that it is characterized in that temperature transducer, liquid level sensor are housed and utilize the engine exhaust heating urea solution on described urea tank; Above-mentioned heat exchanger is made up of suction tude, heat dissipating pipe and steam outlet pipe, is fixed on the urea tank bottom; Suction tude is connected with waste pipe, and the heater switch solenoid valve is installed on the pipeline, and part waste gas is introduced in the above-mentioned heat exchanger, and waste gas is discharged by steam outlet pipe after having heated urea liquid.
6. the urea-spray system of employing gas pressure source according to claim 1 is characterized in that comprising the urea nozzle device that in described urea-spray system it is made up of cooling body, chilling temperature control valve, coolant entrance, coolant outlet; Coolant entrance and coolant outlet are connected with the aircondition of automobile respectively, utilize car air conditioner coolant cools urea nozzle.
7. the urea-spray system of employing gas pressure source according to claim 1, it is characterized in that gas pressure source pressure, spraying urea liquid injection pressure, the urea liquid temperature in the system, the parameters such as liquid level of urea tank all feed back to ECU (Electrical Control Unit), and by ECU (Electrical Control Unit) according to the program control heater switch solenoid valve of setting and the aperture of chilling temperature control valve, thereby the temperature of regulating urea liquid.
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| CN2010101771747A CN102242658A (en) | 2010-05-10 | 2010-05-10 | Urea injection system by adopting gas pressure source |
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| CN2010101771747A CN102242658A (en) | 2010-05-10 | 2010-05-10 | Urea injection system by adopting gas pressure source |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266937A (en) * | 2013-05-21 | 2013-08-28 | 中国第一汽车股份有限公司 | Gas-assisted urea injection system utilizing gravity metering method |
| CN103790680A (en) * | 2014-02-21 | 2014-05-14 | 武汉添蓝发动机排放控制技术有限公司 | AdBlue filling system driven by compressed air |
| CN103931318A (en) * | 2014-03-21 | 2014-07-23 | 中国水稻研究所 | Fixed-point quantitative deep fertilizing device for rice |
| CN104005819A (en) * | 2014-05-19 | 2014-08-27 | 西南交通大学 | Air pressure type urea metering injection system with two urea pressure containers |
| CN105019988A (en) * | 2015-08-03 | 2015-11-04 | 包头北大工道发动机技术有限公司 | Vehicle-mounted urea solution metering, ultrasonic atomizing and supplying device |
| CN105019987A (en) * | 2015-08-03 | 2015-11-04 | 包头北大工道发动机技术有限公司 | Vehicle-mounted urea solution metering, atomizing and supplying device |
| CN105156182A (en) * | 2015-09-17 | 2015-12-16 | 苏州亿利亚科汽车系统有限公司 | Selective catalytic reduction (SCR) injection system and method |
| CN106640294A (en) * | 2017-01-23 | 2017-05-10 | 中国第汽车股份有限公司 | Dual-pressure-transducer type gas-driven urea injection system and control method |
| CN110215823A (en) * | 2019-06-03 | 2019-09-10 | 彩虹集团新能源股份有限公司 | A kind of equipment reducing nitrous oxides concentration in glass furnace fume discharge |
| CN111197516A (en) * | 2020-01-10 | 2020-05-26 | 一汽解放汽车有限公司 | Independent metering gas drive urea injection system |
| CN113931723A (en) * | 2021-10-12 | 2022-01-14 | 河北工业大学 | Device and method for reducing urea crystallization of SCR system |
| CN114856766A (en) * | 2022-04-21 | 2022-08-05 | 国能龙源环保南京有限公司 | Urea solution storage and transportation system and method used in combination with photovoltaic power generation |
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| 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 |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266937A (en) * | 2013-05-21 | 2013-08-28 | 中国第一汽车股份有限公司 | Gas-assisted urea injection system utilizing gravity metering method |
| CN103790680B (en) * | 2014-02-21 | 2016-08-24 | 武汉添蓝发动机排放控制技术有限公司 | A kind of compressed air-driven add blue loading system |
| CN103790680A (en) * | 2014-02-21 | 2014-05-14 | 武汉添蓝发动机排放控制技术有限公司 | AdBlue filling system driven by compressed air |
| CN103931318A (en) * | 2014-03-21 | 2014-07-23 | 中国水稻研究所 | Fixed-point quantitative deep fertilizing device for rice |
| CN103931318B (en) * | 2014-03-21 | 2016-08-31 | 中国水稻研究所 | Oryza sativa L. site-directed quantitative deep fertilizing device |
| CN104005819A (en) * | 2014-05-19 | 2014-08-27 | 西南交通大学 | Air pressure type urea metering injection system with two urea pressure containers |
| CN105019988A (en) * | 2015-08-03 | 2015-11-04 | 包头北大工道发动机技术有限公司 | Vehicle-mounted urea solution metering, ultrasonic atomizing and supplying device |
| CN105019987A (en) * | 2015-08-03 | 2015-11-04 | 包头北大工道发动机技术有限公司 | Vehicle-mounted urea solution metering, atomizing and supplying device |
| CN105019988B (en) * | 2015-08-03 | 2019-07-26 | 包头北大工道发动机技术有限公司 | Vehicle-mounted urea solution metering ultrasonic atomization feedway |
| CN105156182A (en) * | 2015-09-17 | 2015-12-16 | 苏州亿利亚科汽车系统有限公司 | Selective catalytic reduction (SCR) injection system and method |
| CN106640294A (en) * | 2017-01-23 | 2017-05-10 | 中国第汽车股份有限公司 | Dual-pressure-transducer type gas-driven urea injection system and control method |
| CN106640294B (en) * | 2017-01-23 | 2023-02-03 | 中国第一汽车股份有限公司 | Dual-pressure-sensor type gas-drive urea injection system and control method |
| CN110215823A (en) * | 2019-06-03 | 2019-09-10 | 彩虹集团新能源股份有限公司 | A kind of equipment reducing nitrous oxides concentration in glass furnace fume discharge |
| CN111197516A (en) * | 2020-01-10 | 2020-05-26 | 一汽解放汽车有限公司 | Independent metering gas drive urea injection system |
| CN113931723A (en) * | 2021-10-12 | 2022-01-14 | 河北工业大学 | Device and method for reducing urea crystallization of SCR system |
| CN114856766A (en) * | 2022-04-21 | 2022-08-05 | 国能龙源环保南京有限公司 | Urea solution storage and transportation system and method used in combination with photovoltaic power generation |
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Application publication date: 20111116 |