CN105545422A - Air-assisted atomized urea injection system and control method thereof - Google Patents
Air-assisted atomized urea injection system and control method thereof Download PDFInfo
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- CN105545422A CN105545422A CN201610083835.7A CN201610083835A CN105545422A CN 105545422 A CN105545422 A CN 105545422A CN 201610083835 A CN201610083835 A CN 201610083835A CN 105545422 A CN105545422 A CN 105545422A
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- air
- mixing chamber
- urea
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 239000004202 carbamide Substances 0.000 title claims abstract description 148
- 238000002347 injection Methods 0.000 title claims abstract description 32
- 239000007924 injection Substances 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 120
- 239000000243 solution Substances 0.000 claims abstract description 17
- 238000010926 purge Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 136
- 239000007921 spray Substances 0.000 claims description 35
- 239000012530 fluid Substances 0.000 claims description 24
- 238000013022 venting Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 abstract description 7
- 239000007789 gas Substances 0.000 description 123
- 238000003860 storage Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 206010046555 Urinary retention Diseases 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- -1 gasbag pressure tank Substances 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
An air-assisted atomized urea injection system comprises an air source, an air bag pressure tank and an injection pipeline system, wherein a urea solution area and an air bag are arranged in the air bag pressure tank; in the control process, the air source inflates and pressurizes the air bag to enable the urea to be mixed with the air in the mixing cavity and then to be injected, when the urea stops being injected, the air in the air source enters the mixing cavity and the nozzle through the pneumatic switch valve to purge the injection pipeline system, the air in the air bag is communicated to the atmosphere after passing through the two-position three-way valve to deflate and release the air bag. The design has low cost and high system reliability.
Description
Technical field
The present invention relates to a kind of urea for diesel exhaust aftertreatment metering jet atomization system, particularly relate to a kind of air-assisted atomized urea ejecting system and controlling method thereof, be mainly applicable to reduce system cost and improve system reliability.
Background technique
The urea metering jet atomization system of diesel exhaust aftertreatment belongs to internal-combustion engines exhaust gas purifying system, specifically, it is a kind of SCR (SelectiveCatalystReduction) selective catalytic reduction system operating discharged for reducing diesel engine Nox.
In order to realize urea-spray, existing SCR urea injection system generally adopts direct current drive diaphragm pump to pressurize to urea liquid, but adopt direct current drive diaphragm pump, on the one hand due in automobile and other car and boat electric diaphragm pump all need to be powered to it by storage battery, which increase the loss of storage battery electric energy, on the other hand due to the pressure surge of electric diaphragm pump, cause the Stability and veracity of urea solution jet amount poor.Also there is SCR urea injection system directly to compress urea liquid after filtering with pressurized air, although design can solve storage battery electric energy loss problem like this, also bring following problem: first, when filtration system breaks down, easily pollute urea liquid; Secondly, the high-pressure gasbag pressurized tank in system is in high pressure conditions when system cloud gray model always, and it is inconvenient that this makes to add urea, and easily causes producing potential safety hazard to the misoperation of high-pressure gasbag pressurized tank; Finally, be provided with multiple gas flow solenoid valve in system, and need regularly to change pneumatic filter, this can increase the holistic cost of system.
Chinese patent Authorization Notice No. is CN101818675B, authorized announcement date a kind of storage tank pressurizing urea solution metering injection system for diesel vehicle that has been the disclosure of the invention on August 15th, 2012, comprise liquid container, sparger, gas holder, first solenoid valve, second solenoid valve, Venturi tube, mixer and control gear, mixer comprise import and relative with import and with the outlet of inlet communication, sparger is installed in the sidewall of mixer, gas holder by the first solenoid valve respectively gas circuit connect the second solenoid valve and liquid container, liquid container and sparger fluid connection, second electromagnetic valve gas circuit connects Venturi tube, Venturi tube is communicated with the airway of mixer, control gear is electrically connected the first solenoid valve, second solenoid valve and sparger, also comprise one-level pressure relief valve, second depressurized valve, liquid level sensor, first temperature transducer, the safety con-trol part such as the first pressure transducer.Although the present invention's energy-saving safe, being convenient to be integrated in diesel engine vent gas reprocessing, still there is following defect in it:
First, this invention adopts the expensive items such as multiple solenoid valve, multiple reduction valve and Venturi tube, and such design adds the initial cost of after-treatment system, too increases the O&M cost of user simultaneously, is unfavorable for the production domesticization of after-treatment system;
Secondly, the gas in this invention gas holder is directly the urea liquid pressurising in liquid container, and this makes the pollutant existed in gas easily pollute urea liquid, reduces the reliability of system.
Summary of the invention
The object of the invention is to overcome the cost existed in prior art is high, system reliability is low defect and problem, a kind of cost is low, system reliability is high air-assisted atomized urea ejecting system and controlling method thereof are provided.
For realizing above object, technical solution of the present invention is: a kind of air-assisted atomized urea ejecting system, comprise source of the gas, gasbag pressure tank, injection line system, described source of the gas is connected with gasbag pressure tank gas circuit, gasbag pressure tank is connected with injection line system fluid path, and injection line system and control cell signal connects;
The inside of described gasbag pressure tank is provided with urea liquid district, air bag, district is provided with air bag to urea liquid, air bag is successively through the air outlet of two position three-way valve, the suction port of two position three-way valve, be connected with source of the gas gas circuit after pressure maintaining valve, air bag is successively through the air outlet of two position three-way valve, communicate with air after the relief opening of two position three-way valve, described injection line system comprises metering valve, nozzle, mixing chamber, nozzle is successively through mixing chamber, be connected with urea liquid district fluid path after metering valve, described mixing chamber is successively through pneumatic on-off valve, air outlet, suction port, be connected with source of the gas gas circuit after pressure maintaining valve, described two position three-way valve, metering valve is all connected with control unit signal.
Described gasbag pressure tank is provided with pressure transducer, liquid level sensor, temperature transducer, and pressure transducer, liquid level sensor, temperature transducer are all connected with control unit signal.
The top of described gasbag pressure tank is provided with and increases liquid mouth, and increase on liquid mouth and be provided with increasing liquid lid, the bottom of gasbag pressure tank is provided with the filter be connected with metering valve fluid path.
The inside of described mixing chamber is provided with the throttle orifice be connected with pneumatic on-off valve gas circuit, mixing chamber is provided with mixing chamber pressure sensor, and mixing chamber pressure sensor is connected with control unit signal.
Described air-assisted atomized urea ejecting system also comprises SCR postprocessor, and the suction port of SCR postprocessor is connected with outlet pipe gas circuit, and outlet pipe is connected with urea liquid district fluid path successively after nozzle, mixing chamber, metering valve.
Described SCR postprocessor is provided with SCR postprocessor temperature transducer, SCR postprocessor temperature transducer is connected with control unit signal.
Described source of the gas is high-pressure gas cylinder or air compressor.
Described pressure maintaining valve is electric-controlled type pressure maintaining valve or mechanical type pressure maintaining valve, and when pressure maintaining valve is electric-controlled type pressure maintaining valve, pressure maintaining valve is connected with control unit signal.
A controlling method for air-assisted atomized urea ejecting system, described controlling method comprises the following steps:
First connect pressure maintaining valve, two position three-way valve energising is controlled again by control unit, connect to make suction port and air outlet, then source of the gas is controlled successively through pressure maintaining valve, suction port, airbag aeration supercharging is given behind air outlet, connect pneumatic on-off valve again, then source of the gas is controlled successively through pressure maintaining valve, suction port, air outlet, pneumatic on-off valve, mixing chamber, spray after nozzle, when system needs to spray urea liquid, control metering valve by control unit again to connect, now, air bag pressurizes to urea liquid district, the urea liquid in urea liquid district after metering valve with the gas and vapor permeation in mixing chamber, the gas solution of mixing sprays after nozzle, until when system needs to stop urea-spray, then control metering valve by control unit to close, now, the urea liquid in urea liquid district all stops entering mixing chamber, gas in source of the gas enters mixing chamber and nozzle after pneumatic on-off valve, to purge injection line system, two position three-way valve power-off is controlled again by control unit, now, air outlet and relief opening are connected, gas in air bag is successively through air outlet, air is led to after relief opening, venting pressure release is carried out to air bag, now, described controlling method terminates.
The inside of described mixing chamber is provided with the throttle orifice be connected with pneumatic on-off valve gas circuit;
Described air-assisted atomized urea ejecting system also comprises SCR postprocessor, and the suction port of SCR postprocessor is connected with outlet pipe gas circuit, and outlet pipe is connected with urea liquid district fluid path successively after nozzle, mixing chamber, metering valve;
Described control source of the gas sprays successively and refers to after pressure maintaining valve, suction port, air outlet, pneumatic on-off valve, mixing chamber, nozzle: control source of the gas and spray into outlet pipe after pressure maintaining valve, suction port, air outlet, pneumatic on-off valve, throttle orifice, mixing chamber, nozzle successively;
The urea liquid in described urea liquid district after metering valve with the gas and vapor permeation in mixing chamber, the gas solution of mixing sprays and refers to after nozzle: the urea liquid in urea liquid district after metering valve with the gas and vapor permeation in mixing chamber, the gas solution of mixing sprays to outlet pipe after nozzle.
Compared with prior art, beneficial effect of the present invention is:
1, urea liquid district due to gasbag pressure tank in a kind of air-assisted atomized urea ejecting system of the present invention and controlling method thereof is provided with air bag, air bag is successively through two position three-way valve, be connected with source of the gas gas circuit after pressure maintaining valve, air bag communicates with air after two position three-way valve, injection line system comprises metering valve, nozzle, mixing chamber, nozzle is successively through mixing chamber, be connected with urea liquid district fluid path after metering valve, mixing chamber is successively through pneumatic on-off valve, two position three-way valve, be connected with source of the gas gas circuit after pressure maintaining valve, two position three-way valve, metering valve is all connected with control unit signal, such design eliminates expensive component on the one hand, the initial cost of effective reduction after-treatment system, reduce the O&M cost of user simultaneously, be conducive to the production domesticization of after-treatment system, another aspect employing arranges air bag and comes to urea liquid pressurising in gasbag pressure tank, effectively prevent the pollutant that exists in source of the gas to the pollution of urea liquid, improve system reliability, the use of the consumptive materials such as pneumatic filter can be saved simultaneously.Therefore, the present invention not only cost is low, and system reliability is high.
2, because source of the gas in a kind of air-assisted atomized urea ejecting system of the present invention and controlling method thereof is successively through pressure maintaining valve, airbag aeration supercharging is given after two position three-way valve, air bag pressurizes to urea liquid district, the urea liquid in urea liquid district is successively through metering valve, mixing chamber, spray after nozzle, until when system needs to stop urea-spray, the urea liquid in urea liquid district stops spraying, gas in air bag leads to air after two position three-way valve, venting pressure release is carried out to air bag, such design not only structure is simple, easy to operate, and pass through pressure maintaining valve, two position three-way valve carries out pressurising and pressure release to air bag, metering valve entrance point pressure can be maintained basicly stable, reduce the inaccuracy that urea liquid pressure pulse sprays the emitted dose of the metering valve caused.Therefore, the present invention not only structure is simple, easy to operate, and improves the Stability and veracity of urea injecting quantity.
3, because in a kind of air-assisted atomized urea ejecting system of the present invention and controlling method thereof, injection line system comprises metering valve, nozzle, mixing chamber, nozzle is successively through mixing chamber, be connected with urea liquid district fluid path after metering valve, described mixing chamber is successively through pneumatic on-off valve, air outlet, suction port, be connected with source of the gas gas circuit after pressure maintaining valve, in control procedure, outlet pipe is sprayed into through nozzle after the gas entering mixing chamber mixes with the urea liquid entering mixing chamber, such design can improve urea atomization quality, SCR conversion efficiency can be improved and the generation of urea crystals can be prevented.Therefore, the present invention not only increases urea atomization quality, SCR conversion efficiency, and can prevent the generation of urea crystals.
4, owing to gasbag pressure tank being provided with pressure transducer, liquid level sensor, temperature transducer in a kind of air-assisted atomized urea ejecting system of the present invention and controlling method thereof, pressure transducer, liquid level sensor, temperature transducer are all connected with control unit signal, control unit controls the switch of pressure maintaining valve, the switch of two position three-way valve, the switch of metering valve and emitted dose according to the signal collected, such design not only increases the reliability of system, and improves the Stability and veracity of urea injecting quantity.Therefore, the present invention not only increases the reliability of system, and improves the Stability and veracity of urea injecting quantity.
5, because the inside of mixing chamber in a kind of air-assisted atomized urea ejecting system of the present invention and controlling method thereof is provided with the throttle orifice be connected with pneumatic on-off valve gas circuit, mixing chamber is provided with mixing chamber pressure sensor, mixing chamber pressure sensor is connected with control unit signal, in control procedure, the gas flow of mixing chamber is entered by pressure maintaining valve and orifices controls, and ensure the pressure stability of mixing chamber, improve the operating accuracy of metering valve, thus improve the Stability and veracity of urea injecting quantity.Therefore, invention increases the Stability and veracity of urea injecting quantity.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention (pressure maintaining valve is electric-controlled type pressure maintaining valve).
Fig. 2 is structural representation of the present invention (pressure maintaining valve is mechanical type pressure maintaining valve).
In figure: source of the gas 1, gasbag pressure tank 2, urea liquid district 21, air bag 22, pressure transducer 23, liquid level sensor 24, temperature transducer 25, increase liquid mouth 26, increase liquid lid 27, filter 28, injection line system 3, metering valve 31, nozzle 32, mixing chamber 33, throttle orifice 331, mixing chamber pressure sensor 332, control unit 4, pressure maintaining valve 5, two position three-way valve 6, suction port 61, air outlet 62, relief opening 63, pneumatic on-off valve 7, SCR postprocessor 8, SCR postprocessor temperature transducer 81, outlet pipe 82.
Embodiment
Illustrate that the present invention is further detailed explanation with embodiment below in conjunction with accompanying drawing.
See Fig. 1 to Fig. 2, a kind of air-assisted atomized urea ejecting system, comprise source of the gas 1, gasbag pressure tank 2, injection line system 3, described source of the gas 1 is connected with gasbag pressure tank 2 gas circuit, gasbag pressure tank 2 is connected with injection line system 3 fluid path, and injection line system 3 is connected with control unit 4 signal;
The inside of described gasbag pressure tank 2 is provided with urea liquid district 21, air bag 22, urea liquid district 21 is provided with air bag 22, air bag 22 is successively through the air outlet 62 of two position three-way valve 6, the suction port 61 of two position three-way valve 6, be connected with source of the gas 1 gas circuit after pressure maintaining valve 5, air bag 22 is successively through the air outlet 62 of two position three-way valve 6, communicate with air after the relief opening 63 of two position three-way valve 6, described injection line system 3 comprises metering valve 31, nozzle 32, mixing chamber 33, nozzle 32 is successively through mixing chamber 33, be connected with urea liquid district 21 fluid path after metering valve 31, described mixing chamber 33 is successively through pneumatic on-off valve 7, air outlet 62, suction port 61, be connected with source of the gas 1 gas circuit after pressure maintaining valve 5, described two position three-way valve 6, metering valve 31 is all connected with control unit 4 signal.
Described gasbag pressure tank 2 is provided with pressure transducer 23, liquid level sensor 24, temperature transducer 25, pressure transducer 23, liquid level sensor 24, temperature transducer 25 are all connected with control unit 4 signal.
The top of described gasbag pressure tank 2 is provided with and increases liquid mouth 26, and increase on liquid mouth 26 and be provided with increasing liquid lid 27, the bottom of gasbag pressure tank 2 is provided with the filter 28 be connected with metering valve 31 fluid path.
The inside of described mixing chamber 33 is provided with the throttle orifice 331 be connected with pneumatic on-off valve 7 gas circuit, mixing chamber 33 is provided with mixing chamber pressure sensor 332, and mixing chamber pressure sensor 332 is connected with control unit 4 signal.
Described air-assisted atomized urea ejecting system also comprises SCR postprocessor 8, and the suction port of SCR postprocessor 8 is connected with outlet pipe 82 gas circuit, and outlet pipe 82 is connected with urea liquid district 21 fluid path successively after nozzle 32, mixing chamber 33, metering valve 31.
Described SCR postprocessor 8 is provided with SCR postprocessor temperature transducer 81, and SCR postprocessor temperature transducer 81 is connected with control unit 4 signal.
Described source of the gas 1 is high-pressure gas cylinder or air compressor.
Described pressure maintaining valve 5 is electric-controlled type pressure maintaining valve or mechanical type pressure maintaining valve, and when pressure maintaining valve 5 is electric-controlled type pressure maintaining valve, pressure maintaining valve 5 is connected with control unit 4 signal.
A controlling method for air-assisted atomized urea ejecting system, described controlling method comprises the following steps:
First connect pressure maintaining valve 5, control two position three-way valve 6 by control unit 4 to be again energized, connect to make suction port 61 and air outlet 62, then source of the gas 1 is controlled successively through pressure maintaining valve 5, suction port 61, air bag 22 plenum is given behind air outlet 62, connect pneumatic on-off valve 7 again, then source of the gas 1 is controlled successively through pressure maintaining valve 5, suction port 61, air outlet 62, pneumatic on-off valve 7, mixing chamber 33, ejection after nozzle 32, when system needs to spray urea liquid, control metering valve 31 by control unit 4 again to connect, now, air bag 22 pressurizes to urea liquid district 21, the urea liquid in urea liquid district 21 after metering valve 31 with the gas and vapor permeation in mixing chamber 33, the gas solution of mixing sprays after nozzle 32, until when system needs to stop urea-spray, then control metering valve 31 by control unit 4 to close, now, the urea liquid in urea liquid district 21 stops entering mixing chamber 33, gas in source of the gas 1 enters mixing chamber 33 and nozzle 32 after pneumatic on-off valve 7, to purge injection line system 3, two position three-way valve 6 power-off is controlled again by control unit 4, now, air outlet 62 and relief opening 63 are connected, gas in air bag 22 is successively through air outlet 62, air is led to after relief opening 63, venting pressure release is carried out to air bag 22, now, described controlling method terminates.
The inside of described mixing chamber 33 is provided with the throttle orifice 331 be connected with pneumatic on-off valve 7 gas circuit;
Described air-assisted atomized urea ejecting system also comprises SCR postprocessor 8, and the suction port of SCR postprocessor 8 is connected with outlet pipe 82 gas circuit, and outlet pipe 82 is connected with urea liquid district 21 fluid path successively after nozzle 32, mixing chamber 33, metering valve 31;
Described control source of the gas 1 sprays successively and refers to after pressure maintaining valve 5, suction port 61, air outlet 62, pneumatic on-off valve 7, mixing chamber 33, nozzle 32: control source of the gas 1 and spray into outlet pipe 82 after pressure maintaining valve 5, suction port 61, air outlet 62, pneumatic on-off valve 7, throttle orifice 331, mixing chamber 33, nozzle 32 successively;
The urea liquid in described urea liquid district 21 after metering valve 31 with the gas and vapor permeation in mixing chamber 33, the gas solution of mixing sprays and refers to after nozzle 32: the urea liquid in urea liquid district 21 after metering valve 31 with the gas and vapor permeation in mixing chamber 33, the gas solution of mixing sprays to outlet pipe 82 after nozzle 32.
Principle of the present invention is described as follows:
1, source of the gas 1: see Fig. 1 to Fig. 2, source of the gas 1 can be mini air compressor, also can be air storage tank, the wherein outlet pressure of mini air compressor normally 0.8Mpa – 1Mpa, these two kinds of sources of the gas are applicable to various car and boat, for the automobile adopting pneumatic brake, original air compressor and gas holder also can be utilized as source of the gas 1.
2, pressure maintaining valve 5: see Fig. 1 to Fig. 2, the gas of source of the gas 1 is after pressure maintaining valve 5, become the gas of stable gas pressure, no matter pressure maintaining valve 5 is electric-controlled type pressure maintaining valve or mechanical type pressure maintaining valve, its air outlet pressure range is 0.5Mpa – 0.9Mpa, can be set as one of them value of 0.5Mpa – 0.9Mpa as required.
3, two position three-way valve 6: see Fig. 1 to Fig. 2, three gas inlet and outlet joints, an electrical connector is had in two position three-way valve 6, wherein three gas inlet and outlet joints are respectively a suction port 62, one, 61, air outlet relief opening 63, and electrical connector is connected with control unit 4 signal.
When two position three-way valve 6 is energized, suction port 61 and air outlet 62 are connected, and source of the gas 1 gives air bag 22 plenum of gasbag pressure tank 2 successively behind pressure maintaining valve 5, suction port 61, air outlet 62; When two position three-way valve 6 no electric circuit, air outlet 62 and relief opening 63 are connected, and air bag 22 communicates with air successively after air outlet 62, relief opening 63, with pressure release of exitting to air bag 22.
4, gasbag pressure tank 2: see Fig. 1 to Fig. 2, the inside of gasbag pressure tank 2 is provided with urea liquid district 21, air bag 22, urea liquid district 21 is provided with air bag 22, gasbag pressure tank 2 is pressurized container, there is provided pressure to the air bag 22 in gasbag pressure tank 2 by source of the gas 1, the working pressure of gasbag pressure tank 2 is 0.5Mpa – 1.2Mpa.
Described gasbag pressure tank 2 is provided with pressure transducer 23, liquid level sensor 24, temperature transducer 25, pressure transducer 23, liquid level sensor 24, temperature transducer 25 are all connected with control unit 4 signal; Pressure transducer 23 is measured the pressure of urea liquid and is fed back to control unit 4, and liquid level sensor 24 is measured the liquid level of urea liquid and fed back to control unit 4, and temperature transducer 25 is measured the temperature of urea liquid and fed back to control unit 4.
The top of described gasbag pressure tank 2 is provided with and increases liquid mouth 26, increases on liquid mouth 26 and is provided with increasing liquid lid 27, increasing liquid mouth 26 for increasing urea liquid in gasbag pressure tank 2, increasing liquid lid 27 and entering in gasbag pressure tank 2 for preventing introduced contaminants; The bottom of gasbag pressure tank 2 is provided with the filter 28 be connected with metering valve 31 fluid path, and filter 28 enters into metering valve 31 for preventing the impurity in urea liquid.
5, metering valve 31: see Fig. 1 to Fig. 2, the keying of metering valve 31 is controlled by control unit 4, control unit 4 regulates according to the operating conditions of motor and running environment etc. and determines, control metering valve 31 by control signal to work, control unit 4 decides the emitted dose of urea liquid by the opening time controlling metering valve 31.
6, pneumatic on-off valve 7: see Fig. 1 to Fig. 2, described mixing chamber 33 is connected with air outlet 62 gas circuit after pneumatic on-off valve 7, and in control procedure, when pressure reaches certain value, gas pressure backs down pneumatic on-off valve 7; Urea liquid when urea liquid district 21 stops entering mixing chamber 33, gas in source of the gas 1 enters mixing chamber 33 and nozzle 32 after pneumatic on-off valve 7, residual urine cellulose solution in injection line system 3 is purged, prevents urea liquid from producing Crystallization Plugging to injection line system 3 and nozzle.
7, mixing chamber 33: see Fig. 1 to Fig. 2, described mixing chamber 33 is successively through pneumatic on-off valve 7, air outlet 62, suction port 61, be connected with source of the gas 1 gas circuit after pressure maintaining valve 5, mixing chamber 33 is successively through metering valve 31, be connected with urea liquid district 21 fluid path after filter 28, in control procedure, gas in source of the gas 1 is successively through pressure maintaining valve 5, suction port 61, air outlet 62, mixing chamber 33 is entered after pneumatic on-off valve 7, the urea liquid in urea liquid district 21 is successively through filter 28, metering valve 31 enters mixing chamber 33, spray in outlet pipe 82 after nozzle 32 after the gas entering mixing chamber 33 mixes with the urea liquid entering mixing chamber 33.
The inside of described mixing chamber 33 is provided with the throttle orifice 331 be connected with pneumatic on-off valve 7 gas circuit, and throttle orifice 331 is for controlling the gas flow entering mixing chamber 33; Mixing chamber 33 is provided with mixing chamber pressure sensor 332, mixing chamber pressure sensor 332 is connected with control unit 4 signal, and mixing chamber pressure sensor 332 is measured the pressure of mixing chamber 33 and fed back to control unit 4.
8, control unit 4: see Fig. 1 to Fig. 2, the various signal such as oil temperature, water temperature, load, rotating speed that the input signal of described control unit 4 is pressure transducer 23, the output signal of liquid level sensor 24, temperature transducer 25, mixing chamber pressure sensor 332, SCR postprocessor temperature transducer 81 and motor record, and export according to the program of setting the switch that corresponding control signal controls the switch of pressure maintaining valve 5, the switch of metering valve 31 and emitted dose, two position three-way valve 6 by control unit 4, judge that whether system is normal simultaneously.
9, see Fig. 1 to Fig. 2, urea liquid in gasbag pressure tank 2, under the effect of air bag 22 pressure, urea liquid is through filter 28, metering valve 31, mixing chamber 33, nozzle 32, under the control of control unit 4, quantitative urea liquid is sprayed in outlet pipe 82, urea liquid generates ammonia through pyrolysis and hydrolysis reaction at a certain temperature, and the NOx emission in exhaust is reduced to nitrogen by ammonia under catalyst action in SCR postprocessor 8, reaches the effect reducing NOx in exhaust.
Embodiment 1:
See Fig. 1 to Fig. 2, a kind of air-assisted atomized urea ejecting system, comprises source of the gas 1, gasbag pressure tank 2, injection line system 3, described source of the gas 1 is connected with gasbag pressure tank 2 gas circuit, and gasbag pressure tank 2 is connected with injection line system 3 fluid path, and injection line system 3 is connected with control unit 4 signal, and the inside of described gasbag pressure tank 2 is provided with urea liquid district 21, air bag 22, urea liquid district 21 is provided with air bag 22, and air bag 22 is successively through the air outlet 62 of two position three-way valve 6, the suction port 61 of two position three-way valve 6, be connected with source of the gas 1 gas circuit after pressure maintaining valve 5, air bag 22 is successively through the air outlet 62 of two position three-way valve 6, communicate with air after the relief opening 63 of two position three-way valve 6, described injection line system 3 comprises metering valve 31, nozzle 32, mixing chamber 33, nozzle 32 is successively through mixing chamber 33, be connected with urea liquid district 21 fluid path after metering valve 31, described mixing chamber 33 is successively through pneumatic on-off valve 7, air outlet 62, suction port 61, be connected with source of the gas 1 gas circuit after pressure maintaining valve 5, described two position three-way valve 6, metering valve 31 is all connected with control unit 4 signal.
By such scheme, a kind of controlling method of air-assisted atomized urea ejecting system, described controlling method comprises the following steps: first connect pressure maintaining valve 5, control two position three-way valve 6 by control unit 4 to be again energized, connect to make suction port 61 and air outlet 62, then source of the gas 1 is controlled successively through pressure maintaining valve 5, suction port 61, air bag 22 plenum is given behind air outlet 62, connect pneumatic on-off valve 7 again, then source of the gas 1 is controlled successively through pressure maintaining valve 5, suction port 61, air outlet 62, pneumatic on-off valve 7, mixing chamber 33, ejection after nozzle 32, when system needs to spray urea liquid, control metering valve 31 by control unit 4 again to connect, now, air bag 22 pressurizes to urea liquid district 21, the urea liquid in urea liquid district 21 after metering valve 31 with the gas and vapor permeation in mixing chamber 33, the gas solution of mixing sprays after nozzle 32, until when system needs to stop urea-spray, then control metering valve 31 by control unit 4 to close, now, the urea liquid in urea liquid district 21 stops entering mixing chamber 33, gas in source of the gas 1 enters mixing chamber 33 and nozzle 32 after pneumatic on-off valve 7, to purge injection line system 3, two position three-way valve 6 power-off is controlled again by control unit 4, now, air outlet 62 and relief opening 63 are connected, gas in air bag 22 is successively through air outlet 62, air is led to after relief opening 63, venting pressure release is carried out to air bag 22, now, described controlling method terminates.
Embodiment 2:
Substance is with embodiment 1, and difference is:
See Fig. 1 to Fig. 2, described gasbag pressure tank 2 is provided with pressure transducer 23, liquid level sensor 24, temperature transducer 25, pressure transducer 23, liquid level sensor 24, temperature transducer 25 are all connected with control unit 4 signal; The top of described gasbag pressure tank 2 is provided with and increases liquid mouth 26, and increase on liquid mouth 26 and be provided with increasing liquid lid 27, the bottom of gasbag pressure tank 2 is provided with the filter 28 be connected with metering valve 31 fluid path.
Embodiment 3:
Substance is with embodiment 1, and difference is:
See Fig. 1 to Fig. 2, the inside of described mixing chamber 33 is provided with the throttle orifice 331 be connected with pneumatic on-off valve 7 gas circuit, mixing chamber 33 is provided with mixing chamber pressure sensor 332, and mixing chamber pressure sensor 332 is connected with control unit 4 signal; Described air-assisted atomized urea ejecting system also comprises SCR postprocessor 8, the suction port of SCR postprocessor 8 is connected with outlet pipe 82 gas circuit, outlet pipe 82 is connected with urea liquid district 21 fluid path successively after nozzle 32, mixing chamber 33, metering valve 31, described SCR postprocessor 8 is provided with SCR postprocessor temperature transducer 81, and SCR postprocessor temperature transducer 81 is connected with control unit 4 signal.
Described control source of the gas 1 sprays successively and refers to after pressure maintaining valve 5, suction port 61, air outlet 62, pneumatic on-off valve 7, mixing chamber 33, nozzle 32: control source of the gas 1 and spray into outlet pipe 82 after pressure maintaining valve 5, suction port 61, air outlet 62, pneumatic on-off valve 7, throttle orifice 331, mixing chamber 33, nozzle 32 successively; The urea liquid in described urea liquid district 21 after metering valve 31 with the gas and vapor permeation in mixing chamber 33, the gas solution of mixing sprays and refers to after nozzle 32: the urea liquid in urea liquid district 21 after metering valve 31 with the gas and vapor permeation in mixing chamber 33, the gas solution of mixing sprays to outlet pipe 82 after nozzle 32.
Embodiment 4:
Substance is with embodiment 1, and difference is:
See Fig. 1 to Fig. 2, described source of the gas 1 is high-pressure gas cylinder or air compressor; Described pressure maintaining valve 5 is electric-controlled type pressure maintaining valve or mechanical type pressure maintaining valve, and when pressure maintaining valve 5 is electric-controlled type pressure maintaining valve, pressure maintaining valve 5 is connected with control unit 4 signal.
Claims (10)
1. an air-assisted atomized urea ejecting system, comprise source of the gas (1), gasbag pressure tank (2), injection line system (3), described source of the gas (1) is connected with gasbag pressure tank (2) gas circuit, gasbag pressure tank (2) is connected with injection line system (3) fluid path, injection line system (3) is connected with control unit (4) signal, it is characterized in that:
The inside of described gasbag pressure tank (2) is provided with urea liquid district (21), air bag (22), urea liquid district (21) is provided with air bag (22), air bag (22) is successively through the air outlet (62) of two position three-way valve (6), the suction port (61) of two position three-way valve (6), pressure maintaining valve (5) is connected with source of the gas (1) gas circuit afterwards, air bag (22) is successively through the air outlet (62) of two position three-way valve (6), the relief opening (63) of two position three-way valve (6) communicates with air afterwards, described injection line system (3) comprises metering valve (31), nozzle (32), mixing chamber (33), nozzle (32) is successively through mixing chamber (33), metering valve (31) is connected with urea liquid district (21) fluid path afterwards, described mixing chamber (33) is successively through pneumatic on-off valve (7), air outlet (62), suction port (61), pressure maintaining valve (5) is connected with source of the gas (1) gas circuit afterwards, described two position three-way valve (6), metering valve (31) is all connected with control unit (4) signal.
2. a kind of air-assisted atomized urea ejecting system according to claim 1, it is characterized in that: described gasbag pressure tank (2) is provided with pressure transducer (23), liquid level sensor (24), temperature transducer (25), pressure transducer (23), liquid level sensor (24), temperature transducer (25) are all connected with control unit (4) signal.
3. a kind of air-assisted atomized urea ejecting system according to claim 1, it is characterized in that: the top of described gasbag pressure tank (2) is provided with and increases liquid mouth (26), increase on liquid mouth (26) and be provided with increasing liquid lid (27), the bottom of gasbag pressure tank (2) is provided with the filter (28) be connected with metering valve (31) fluid path.
4. a kind of air-assisted atomized urea ejecting system according to claim 1, it is characterized in that: the inside of described mixing chamber (33) is provided with the throttle orifice (331) be connected with pneumatic on-off valve (7) gas circuit, mixing chamber (33) is provided with mixing chamber pressure sensor (332), mixing chamber pressure sensor (332) is connected with control unit (4) signal.
5. a kind of air-assisted atomized urea ejecting system according to claim 1, it is characterized in that: described air-assisted atomized urea ejecting system also comprises SCR postprocessor (8), the suction port of SCR postprocessor (8) is connected with outlet pipe (82) gas circuit, and outlet pipe (82) is connected with urea liquid district (21) fluid path successively after nozzle (32), mixing chamber (33), metering valve (31).
6. a kind of air-assisted atomized urea ejecting system according to claim 5, it is characterized in that: described SCR postprocessor (8) is provided with SCR postprocessor temperature transducer (81), SCR postprocessor temperature transducer (81) is connected with control unit (4) signal.
7. according to a kind of air-assisted atomized urea ejecting system in claim 1 – 6 described in any one, it is characterized in that: described source of the gas (1) is high-pressure gas cylinder or air compressor.
8. according to a kind of air-assisted atomized urea ejecting system in claim 1 – 6 described in any one, it is characterized in that: described pressure maintaining valve (5) is electric-controlled type pressure maintaining valve or mechanical type pressure maintaining valve, when pressure maintaining valve (5) is for electric-controlled type pressure maintaining valve, pressure maintaining valve (5) is connected with control unit (4) signal.
9. a controlling method for air-assisted atomized urea ejecting system according to claim 1, is characterized in that: described controlling method comprises the following steps:
First connect pressure maintaining valve (5), two position three-way valve (6) energising is controlled again by control unit (4), connect to make suction port (61) and air outlet (62), then source of the gas (1) is controlled successively through pressure maintaining valve (5), suction port (61), air bag (22) plenum is given afterwards in air outlet (62), connect pneumatic on-off valve (7) again, then source of the gas (1) is controlled successively through pressure maintaining valve (5), suction port (61), air outlet (62), pneumatic on-off valve (7), mixing chamber (33), nozzle (32) sprays afterwards, when system needs to spray urea liquid, control metering valve (31) by control unit (4) again to connect, now, air bag (22) pressurizes to urea liquid district (21), the urea liquid in urea liquid district (21) after metering valve (31) with the gas and vapor permeation in mixing chamber (33), the gas solution of mixing sprays after nozzle (32), until when system needs to stop urea-spray, then control metering valve (31) by control unit (4) to close, now, the urea liquid in urea liquid district (21) stops entering mixing chamber (33), gas in source of the gas (1) enters mixing chamber (33) and nozzle (32) after pneumatic on-off valve (7), to purge injection line system (3), two position three-way valve (6) power-off is controlled again by control unit (4), now, air outlet (62) and relief opening (63) are connected, gas in air bag (22) is successively through air outlet (62), relief opening leads to air after (63), venting pressure release is carried out to air bag (22), now, described controlling method terminates.
10. the controlling method of a kind of air-assisted atomized urea ejecting system according to claim 9, is characterized in that:
The inside of described mixing chamber (33) is provided with the throttle orifice (331) be connected with pneumatic on-off valve (7) gas circuit;
Described air-assisted atomized urea ejecting system also comprises SCR postprocessor (8), the suction port of SCR postprocessor (8) is connected with outlet pipe (82) gas circuit, and outlet pipe (82) is connected with urea liquid district (21) fluid path successively after nozzle (32), mixing chamber (33), metering valve (31);
Described control source of the gas (1) sprays successively and refers to after pressure maintaining valve (5), suction port (61), air outlet (62), pneumatic on-off valve (7), mixing chamber (33), nozzle (32): control source of the gas (1) and spray into through pressure maintaining valve (5), suction port (61), air outlet (62), pneumatic on-off valve (7), throttle orifice (331), mixing chamber (33), nozzle (32) backward outlet pipe (82) successively;
The urea liquid of described urea liquid district (21) after metering valve (31) with the gas and vapor permeation in mixing chamber (33), the gas solution of mixing sprays and refers to after nozzle (32): the urea liquid of urea liquid district (21) after metering valve (31) with the gas and vapor permeation in mixing chamber (33), the gas solution of mixing sprays through nozzle (32) backward outlet pipe (82).
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| CN201610083835.7A CN105545422B (en) | 2016-02-05 | 2016-02-05 | Air-assisted atomized urea injection system and control method thereof |
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| EP3741968A3 (en) * | 2019-04-26 | 2021-01-13 | Liebherr-Components Colmar SAS | Reductant dosing system for an scr catalyst |
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| CN105545422B (en) | 2018-01-30 |
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