CN1560439A - Apparatus for supplying reducing agent to hydroxide catalyzing transforming device of internal combustion engine - Google Patents

Apparatus for supplying reducing agent to hydroxide catalyzing transforming device of internal combustion engine Download PDF

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Publication number
CN1560439A
CN1560439A CNA2004100044720A CN200410004472A CN1560439A CN 1560439 A CN1560439 A CN 1560439A CN A2004100044720 A CNA2004100044720 A CN A2004100044720A CN 200410004472 A CN200410004472 A CN 200410004472A CN 1560439 A CN1560439 A CN 1560439A
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China
Prior art keywords
reducing agent
nozzle
reducer
compressed air
mixing tube
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Granted
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CNA2004100044720A
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Chinese (zh)
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CN1298969C (en
Inventor
帅石金
徐仲伦
王建昕
肖建华
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Tsinghua University
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Tsinghua University
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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
    • Y02T10/40—Engine management systems

Abstract

The invention is a reducer supplying device for inner combustion nitrogen oxide catalyst converter, which belongs car tail gas discharging control technology. The invention includes reducer ejector, reducer storing pot and transmitting pump, gas storage pot and gas control valve and electron controller; the reducer ejector is made up of ejector body, electromagnetic valve nozzle, compound pipe with multi-aperture nozzles, and it also includes cooling liquid inlet, outlet and compressed air inlet. The reducer is blended with the compressed air in the compound pipe, and it is ejected into the discharging pipe through the multi-aperture nozzle, and distributed onto the surface of the catalyst, thus it upgrades the effective utilization rate of the reducer; and the reducer nozzle is not assembled on the discharging pipe directly, avoids the discharging pipe high temperature, adds the temperature drop of the compressed air and the cooling liquid, it can increase the reliability and prolong life service of the supplying device. The electron controller can carry on instant control to the reducer flow, thus it can be adapted to the demands of the state in the inner combustion machine.

Description

A kind of reducer feeding device that is used for internal-combustion engine nitrogen oxide catalytic converter
Technical field
The present invention relates to a kind of reducer feeding device of internal-combustion engine nitrogen oxide catalytic converter, belong to motor vehicle exhaust emission control
Technical field.
Background technique
Contain carbon monoxide (CO), hydrocarbon (HC) and nitrogen oxide pollutants such as (NOx) in the exhaust of internal-combustion engine.People often adopt post-processing technologies such as catalytic converter, and they are converted into carbon dioxide (CO 2), water (H 2O) and nitrogen (N 2) wait harmless composition.CO, HC are converted into CO 2, H 2The process of O is an oxidation reaction, and NOx is converted into N 2Process be reduction reaction.Uniform-charge Otto-engine is worked near air fuel ratio can being controlled at stoichiometric proportion, CO, HC and NOx Oxidizing and Reducing Agents each other in the exhaust, the transformation efficiency of CO, HC and NOx is very high under the effect of three-way catalyst (TWC), can satisfy strict emission regulation demands.But diesel engine or lean combustion petrol engine etc. is to work under rare partially air fuel ratio, owing to have more oxygen in the exhaust, i.e. oxygen-enriched environment, CO and HC are easy to transform with the oxidation catalyst of technology maturation, and the reduction reaction of NOx is difficult to carry out.At present, the post-processing technology of NOx is in the research and development in the oxygen-enriched environment, does not also have the practicability product.Under study for action, it is found that and as hydrocarbon fuel, urea, ethanol etc., just can improve the transformation efficiency of NOx if in the exhaust of NOx catalytic converter upstream, add reducing substances.This method is called selective catalytic reduction (SCR).
Along with adding of automobile emission regulation is tight, the catalyzed conversion reprocessing of lean-burn NOx seems inevitable.The research of reducer feeding device practicability is also carried out stepping up.Patent EP 1,331 373 discloses a kind of " reducing agent supply system " (ReductantSupply System), it is subject to exhaust high temperature at the reducing agent nozzle in the direct insertion outlet pipe and situation about stopping up, and proposes a kind of some reducing agents of spray that add to keep the unimpeded method of spout before spout is about to stop up.This method is owing to directly insert nozzle in the high-temperature exhaust air, so coking easily, although spraying some reducing agents can avoid stopping up more, but high temperature can reduce the working life of nozzle, and spray reducing agent more and make cost increase, also strengthened the storage capacity of reducing agent, be unfavorable on haulage vehicle, using.
Test method and the device of in laboratory research, supplying with reducing agent have been introduced among the paper SAE 952489 that Britain Johnson Matthey company delivers " Development of Test Methods forLean-NOx Catalyst Evaluation " to the agent of lean-burn NOx catalyzed conversion.This device is used for reducing agent (diesel oil) is ejected in the outlet pipe, and promptly diesel oil flows into gear pump by an electromagnetic valve switch, and the diesel oil of the gear pump of flowing through is mixed into outlet pipe with pressurized air in nozzle.The reducing agent flow of this device is controlled by gear pump, nozzle has been a mixed function, and gear pump can only carry out Steady-State Control to the reducing agent flow, can not carry out transient control, thus in the incompatibility internal combustion engine operation variable working condition to the requirement of reducing agent injection amount.
Summary of the invention
The objective of the invention is to provide a kind of device of practicality to internal-combustion engine lean-burn NOx catalytic converter supply reducing agent at selective catalytic reduction system operating.This device both can prevent effectively that the spout place from blocking because of the reducing agent high-temperature coking, can in outlet pipe, fully atomize again and even distribution reducing agent, and can carry out at regular time and quantity transient control, thereby can improve the working life of injection apparatus, the transformation efficiency of catalytic converter and the effective rate of utilization of reducing agent to the reducing agent flow.
The objective of the invention is to be achieved through the following technical solutions: a kind of reducer feeding device that is used for internal-combustion engine nitrogen oxide catalytic converter, it is characterized in that: this device comprises the reducing agent injector that is fixed on the internal-combustion engine vent-pipe, reducing agent storage tank and transfer pump, compressed air storage tank and gas control valve and the electronic controller that is used for controlling reducer feeding device; Described reducing agent injector comprises ejector body, is installed in intrinsic solenoid valve nozzle, the mixing tube of guide ring that links to each other with this jet expansion and band porous nozzle, and this mixing tube extend in the outlet pipe; On described ejector body, be respectively equipped with cooling liquid inlet and cooling liquid outlet and compressed air inlet; Described reducing agent storage tank, transfer pump link to each other by the import of the solenoid valve nozzle in pipeline and the sparger, and compressed air storage tank, gas control valve link to each other with described compressed air inlet by pipeline; Described electronic controller is connected with described solenoid valve nozzle, gas control valve and internal-combustion engine respectively by control wiring.
The reducer feeding device that the present invention proposes compared with prior art, have following characteristics and high-lighting effect: 1. liquid reducing agent does not directly spray into outlet pipe, but be introduced into mixing tube, after mixing, atomize with pressurized air in mixing tube, the porous nozzle by mixing tube looses and is sprayed onto in the outlet pipe again; The atomizing of reducing agent like this, scattering can make reducing agent spread to the surface of catalyzer more widely, improve the effective rate of utilization of reducing agent.2. the reducing agent nozzle is not directly installed on the outlet pipe, can avoid the influence of outlet pipe high temperature, adds the cooling of compressed-air actuated cooling and cooling liquid, can effectively improve the working life and the reliability of operation of reducing agent feeding mechanism.3. reducing agent and Air mixing gas spray into outlet pipe by the porous nozzle of mixing tube head, and reducing agent is evenly distributed in exhaust; Pressurized air produces eddy flow by guide ring, impels reducing agent and pressurized air to quicken to mix, and pressurized air also can prevent spray nozzle clogging.4. the solenoid valve nozzle can be controlled the instantaneous emitted dose of reducing agent at regular time and quantity with impulsive current, and variable working condition is to the requirement of reducing agent injection amount in the adaptation internal combustion engine operation.5. thereby compressed air control valve is a valve that can change air passageways area size control air mass flow, both can open and close simultaneously with reducing agent nozzle valve, also can open separately when nozzle is closed, and when opening separately, pressurized air only is used for cooling jet.6. the present invention adopts the whole reducer feeding device of electronic controller controls, electronic controller can be in advance set reducing agent and compressed-air actuated supply constantly and supply according to the operating conditions of motor, thereby can adapt in the internal combustion engine operation variable working condition to the requirement of reducing agent injection amount.
Description of drawings
Fig. 1 is the general structure schematic representation of reducer feeding device provided by the invention.
Fig. 2 is the structural representation of reducing agent injector.
Fig. 3 is guide ring embodiment's a structural representation.
Fig. 4 is the structural representation that has the mixing tube embodiment of porous nozzle.
Embodiment
Further specify concrete structure of the present invention, working procedure and preferred forms below in conjunction with accompanying drawing.
This reducer feeding device mainly comprises reducing agent injector 3, reducing agent storage tank 6 and transfer pump 7, compressed air storage tank 8 and gas control valve 9 and the electronic controller 5 that is used for controlling reducer feeding device; Reducing agent injector 3 is installed on the outlet pipe 2, supplies with reducing agent to catalytic converter 4.Reducing agent storage tank 6, transfer pump 7 are connected with sparger 3 by pipeline; Compressed air storage tank 8, gas control valve 9 by pipeline be connected with sparger 3; Electronic controller 5 is connected (as shown in Figure 1) with reducing agent injector 3, gas control valve 9 and internal-combustion engine 1 respectively by control wiring.
Fig. 2 is the structural representation of former dose of sparger.Described reducing agent injector 3 comprises ejector body 22, is installed in intrinsic solenoid valve nozzle 15, the mixing tube 18 of guide ring 17 that links to each other with this jet expansion 19 and band porous nozzle 20, and this mixing tube extend in the outlet pipe 2; On described ejector body, be respectively equipped with cooling liquid inlet 10 and cooling liquid outlet 11 and compressed air inlet 16.In the outlet and the guide ring between the mixing tube 17 of described solenoid valve nozzle, be provided with two tangential or spiral vent slots 21 at least.
The working procedure of this supplier is as follows: transfer pump 7 is imported sparger 3 from storage tank 6 with certain pressure with the reducing agent of liquid condition, and the outlet 19 from solenoid valve nozzle 15 sprays again.Meanwhile, the pressurized air of certain pressure enters sparger 3 from gas tank 8 through gas control valve 9, mixes with the reducing agent that sprays from jet expansion 19 in mixing tube 18, forms mixed gas.Mixed gas sprays into the outlet pipe 2 through porous nozzle 20 from mixing tube 18 with spray pattern, and then is disseminated to the surface of NOx catalyzer in the catalytic converter 4 with engine exhaust.Proper functioning for the temperatures involved sparger 3 that prevents outlet pipe 2, the cooling liquid of internal-combustion engine cooling system or the other cooling system (Fig. 1 does not represent) that is provided with enters sparger inner chamber 13 from cooling liquid inlet 10, sparger is cooled off, flow back to cooling system from exporting 11 again.
Electronic controller 5 links to each other with automatically controlled interface 23 on the solenoid valve nozzle 15 by control wiring, and the solenoid valve nozzle can be controlled the instantaneous emitted dose of reducing agent at regular time and quantity with impulsive current, adapts in the internal combustion engine operation variable working condition to the requirement of reducing agent injection amount.Electronic controller sends instruction with impulsive current to the solenoid valve nozzle, the switching of control electromagnetic valve, and then the supply moment and the quantity of control reducing agent.Reducing agent enters solenoid valve nozzle 15 from reducing agent import 24, from jet expansion 19 ejections, enters mixing tube 18.Meanwhile, pressurized air through gas control valve 9 enters ejector body 22 from compressed air inlet 16, along air passageways 14 guide to jet expansion 19 around, make pressurized air form eddy flow through the vent slot 21 on the guide ring 17 again, mix with the reducing agent of said nozzle outlet 19 ejections, in mixing tube 18, form mixed gas, after porous nozzle 20 spray in the outlet pipe 2.Guide ring 17 is parts of a cylindrical toroidal, and the cylindrical of its external cylindrical surface and jet expansion 19 joins, and the inner chamber of inner cylindrical surface and mixing tube 18 joins.At least be provided with two tangential vent slots or spiral vent slot 21 on the guide ring.The import of this groove is connected with described compressed air inlet 16 by air passageways 14, and the outlet of this groove communicates with the inner chamber of described mixing tube 18.The pressurized air that guide ring is outer behind this vent slot of flowing through, promptly forms eddy flow in inner cylindrical surface, flow in the mixing tube 18.Fig. 3 is specific embodiment of guide ring, can the vent slot on the guide ring be made different shape according to the form and the characteristic of the reducing agent that sprays, and makes air-flow form the eddy flow of varying strength, impels reducing agent to atomize better.
Mixing tube 18 is strength members of sparger 3, and porous nozzle is provided with two spray orifices at least; The position of its ejiction opening the and influence effective rate of utilization of reducing agent towards meeting, generally the ejiction opening of mixing tube in outlet pipe towards should with the flow direction of exhaust in the outlet pipe in the same way or reverse or be an angle; Porous nozzle should be positioned at middle part or tube wall or arbitrary position therebetween of outlet pipe, and its concrete position reaches towards setting according to the shape and the spraying of place outlet pipe.The porous nozzle 20 of mixing tube 18 mouths of pipe tightens up with welding or machinery type and mixing tube, and the spray orifice on the shower nozzle can be made different shape, so that the reducing agent of mist is along the axial ejection of mixing tube outlet or scattering etc. around the mouth of pipe.Fig. 4 is the structural representation that has the mixing tube embodiment of porous nozzle.The above-mentioned pressurized air that enters sparger 3 is except atomizing and scatter the effect of reducing agent, also to 15 cooling actions of nozzle, makes not reason reducing agent high-temperature coking and blocking of nozzle.The moment and the quantity of pressurized air input oil sprayer are controlled by gas control valve 9.Gas control valve 9 is the valves that can change air passageways area size, the certain compressed-air actuated flow of pressure is changed, and its valve rod can be by drivings such as electromagnetic coil or stepper motors.By electronic controller 5 controls, it both can open and close with nozzle solenoid valve 15 this control valve simultaneously, also can open separately when nozzle is closed equally.When opening separately, pressurized air only is used for cooling jet.Compressed air inlet 16 and cooling liquid inlet 10, cooling liquid outlet 11 can adopt Placements such as internal-combustion engine or automobile sebific duct commonly used or steel pipe to be connected with sparger 3.
Solenoid valve nozzle 15 adopts fuel of internal combustion engine nozzle pressing plate or other Placements commonly used to be contained on the ejector body 22 together with guide ring 17; Reducing agent mixing tube 18 and porous nozzle 20 extend in the outlet pipe, use welding or machinery type and ejector body 22 fastening.Whole injector part is installed on the internal-combustion engine vent-pipe 2 with mechanical connection manners such as screw thread or flanges.
Reducer feeding device is controlled with electronic controller 5.Electronic controller is according to signals such as the rotating speed of importing from the various sensors of internal-combustion engine, load (accelerator open degree), coolant temperature, charge flow rate, delivery temperature, exhaust gas compositions, various data, computing by analysis in conjunction with storage, send action command with electrical signal to performers such as reducing agent nozzle, gas control valves, control reducing agent and compressed-air actuated input time and quantity.

Claims (4)

1. reducer feeding device that is used for internal-combustion engine nitrogen oxide catalytic converter, it is characterized in that: this device comprises the reducing agent injector (3) that is fixed on the internal-combustion engine vent-pipe, reducing agent storage tank (6) and transfer pump (7), compressed air storage tank (8) and gas control valve (9) and the electronic controller (5) that is used for controlling reducer feeding device; Described reducing agent injector comprises ejector body (22), be installed in intrinsic solenoid valve nozzle (15), the mixing tube (18) of guide ring (17) that links to each other with this jet expansion (19) and band porous nozzle (20), this mixing tube extend in the outlet pipe (2); On described ejector body, be respectively equipped with cooling liquid inlet (10) and cooling liquid outlet (11) and compressed air inlet (16); Reducing agent storage tank (6), transfer pump (7) link to each other by the import of the solenoid valve nozzle in pipeline and the sparger, and compressed air storage tank (8), solenoid electric valve (9) link to each other with described compressed air inlet by pipeline; Described electronic controller (5) is connected with described solenoid valve nozzle, solenoid electric valve and internal-combustion engine (1) by control wiring.
2. according to the described reducer feeding device of claim 1, it is characterized in that: be provided with two tangential vent slots or spiral vent slot (21) on the outlet of described solenoid valve nozzle and the guide ring between the mixing tube (17) at least, the import of this groove is connected with described compressed air inlet (16) by air passageways (14), and the outlet of this groove communicates with the inner chamber of described mixing tube (18).
3. according to claim 1 or 2 described reducer feeding devices, it is characterized in that: the ejiction opening of the mixing tube (18) of described band porous nozzle (20) in outlet pipe towards with outlet pipe in exhaust flow direction in the same way or reverse or be an angle; Porous nozzle (20) is positioned at middle part or tube wall or arbitrary position therebetween of outlet pipe.
4. according to the described reducer feeding device of claim 3, it is characterized in that: described porous nozzle is provided with two spray orifices at least.
CNB2004100044720A 2004-02-27 2004-02-27 Apparatus for supplying reducing agent to hydroxide catalyzing transforming device of internal combustion engine Expired - Fee Related CN1298969C (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102116186A (en) * 2010-07-21 2011-07-06 苏州派格力减排系统有限公司 Gas-liquid stirring and mixing device of urea solution metering injection system
CN101523022B (en) * 2006-10-04 2012-01-11 罗伯特·博世有限公司 Tank for storing a reducing agent
CN102410068A (en) * 2010-09-07 2012-04-11 罗伯特·博世有限公司 Compressed air atomizer
CN102425724A (en) * 2011-08-25 2012-04-25 厦门卓越生物质能源有限公司 Tail gas delivery device in bio-diesel production
CN101688455B (en) * 2007-07-03 2012-06-13 日立建机株式会社 Engine powered machine
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
CN101675219B (en) * 2007-03-02 2013-01-02 卡特彼勒公司 Fluid injector having purge heater
CN103032136A (en) * 2011-10-02 2013-04-10 苏州派格丽减排系统有限公司 Selective catalytic reduction (SCR) system with external mixing nozzle metering structure
CN104454093A (en) * 2014-11-13 2015-03-25 重庆超力高科技股份有限公司 Precise-jetting quick-responding air type SCR jetting device and method
CN104879197A (en) * 2015-04-09 2015-09-02 中国第一汽车股份有限公司无锡油泵油嘴研究所 Exhaust pipe mounting device of ejector
CN106151021A (en) * 2016-09-22 2016-11-23 凯龙高科技股份有限公司 A kind of urea pump of tilting air valve
CN115217584A (en) * 2022-03-01 2022-10-21 广州汽车集团股份有限公司 Exhaust gas treatment device and exhaust gas treatment method for hydrogen engine, and vehicle

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* Cited by examiner, † Cited by third party
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SE518040C2 (en) * 1997-03-17 2002-08-20 Volvo Lastvagnar Ab Four-stroke diesel engine with catalytic converter
US5976475A (en) * 1997-04-02 1999-11-02 Clean Diesel Technologies, Inc. Reducing NOx emissions from an engine by temperature-controlled urea injection for selective catalytic reduction
US6470673B1 (en) * 2000-02-22 2002-10-29 Ford Global Technologies, Inc. Control of a NOX reductant delivery system

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101523022B (en) * 2006-10-04 2012-01-11 罗伯特·博世有限公司 Tank for storing a reducing agent
CN101675219B (en) * 2007-03-02 2013-01-02 卡特彼勒公司 Fluid injector having purge heater
CN101688455B (en) * 2007-07-03 2012-06-13 日立建机株式会社 Engine powered machine
CN102116186A (en) * 2010-07-21 2011-07-06 苏州派格力减排系统有限公司 Gas-liquid stirring and mixing device of urea solution metering injection system
CN102410068A (en) * 2010-09-07 2012-04-11 罗伯特·博世有限公司 Compressed air atomizer
CN102425724A (en) * 2011-08-25 2012-04-25 厦门卓越生物质能源有限公司 Tail gas delivery device in bio-diesel production
CN103032136A (en) * 2011-10-02 2013-04-10 苏州派格丽减排系统有限公司 Selective catalytic reduction (SCR) system with external mixing nozzle metering structure
CN103032136B (en) * 2011-10-02 2015-01-21 苏州派格丽减排系统有限公司 Selective catalytic reduction (SCR) system with external mixing nozzle metering structure
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
CN104454093A (en) * 2014-11-13 2015-03-25 重庆超力高科技股份有限公司 Precise-jetting quick-responding air type SCR jetting device and method
CN104879197A (en) * 2015-04-09 2015-09-02 中国第一汽车股份有限公司无锡油泵油嘴研究所 Exhaust pipe mounting device of ejector
CN104879197B (en) * 2015-04-09 2018-05-04 中国第一汽车股份有限公司无锡油泵油嘴研究所 A kind of exhaust pipe erecting device of injector
CN106151021A (en) * 2016-09-22 2016-11-23 凯龙高科技股份有限公司 A kind of urea pump of tilting air valve
CN106151021B (en) * 2016-09-22 2019-04-12 凯龙高科技股份有限公司 A kind of urea pump of tilting air valve
CN115217584A (en) * 2022-03-01 2022-10-21 广州汽车集团股份有限公司 Exhaust gas treatment device and exhaust gas treatment method for hydrogen engine, and vehicle
CN115217584B (en) * 2022-03-01 2024-03-08 广州汽车集团股份有限公司 Exhaust gas treatment device and exhaust gas treatment method for hydrogen engine, and vehicle

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