CN105545422B - Air-assisted atomized urea injection system and control method thereof - Google Patents
Air-assisted atomized urea injection system and control method thereof Download PDFInfo
- Publication number
- CN105545422B CN105545422B CN201610083835.7A CN201610083835A CN105545422B CN 105545422 B CN105545422 B CN 105545422B CN 201610083835 A CN201610083835 A CN 201610083835A CN 105545422 B CN105545422 B CN 105545422B
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- hybrid chamber
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 152
- 239000004202 carbamide Substances 0.000 title claims abstract description 152
- 238000002347 injection Methods 0.000 title claims abstract description 39
- 239000007924 injection Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000002156 mixing Methods 0.000 claims abstract description 45
- 239000000243 solution Substances 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims description 133
- 238000005507 spraying Methods 0.000 claims description 30
- 239000012530 fluid Substances 0.000 claims description 27
- 239000007921 spray Substances 0.000 claims description 26
- 238000000889 atomisation Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 5
- 238000010926 purge Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 163
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000008676 import Effects 0.000 description 3
- 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
- 239000003054 catalyst Substances 0.000 description 2
- 230000008859 change Effects 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
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000006193 liquid solution Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 210000002700 urine Anatomy 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000002485 combustion reaction 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
- 230000006837 decompression Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- -1 gasbag pressure tank Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008450 motivation Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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 to measure jet atomization system, more particularly to a kind of
Air-assisted atomized urea spraying system and its control method, being primarily adapted for use in reduces system cost and raising system reliability.
Background technology
The urea metering jet atomization system of diesel exhaust aftertreatment belongs to internal-combustion engines exhaust gas purifying system, specifically
Say, it is that a kind of SCR (Selective Catalyst Reduction) for being used to reduce diesel engine Nox discharges is selectively urged
Original system is gone back in change.
In order to realize that urea sprays, existing SCR urea injection systems are generally molten to urea using direct current drive membrane pump
Liquid pressurizes, but uses direct current drive membrane pump, on the one hand due in automobile and other car and boat electric diaphragm pump be required for by
Battery is powered to it, and which increase the loss of battery electric energy, on the other hand due to the pressure oscillation of electric diaphragm pump, causes
The Stability and veracity of urea liquid emitted dose is poor.Also have SCR urea injection systems directly with compressed air after filtering
Urea liquid is compressed, although so design can solve battery electric energy loss problem, also brings following problem：First,
When filtration system breaks down, urea liquid is easily polluted；Secondly, the high-pressure gasbag pressurized tank in system is in system operation
High pressure conditions are constantly in, this to add urea inconvenience, and easily causes the maloperation to high-pressure gasbag pressurized tank to produce
Potential safety hazard；Finally, multiple gas flow magnetic valves are provided with system, and need periodically to change pneumatic filter,
This can increase the holistic cost of system.
Chinese patent Authorization Notice No. is CN101818675B, and authorized announcement date is in August, 2012 disclosure of the invention of 15 days
A kind of storage tank pressurizing urea solution metering injection system for diesel vehicle, including fluid reservoir, injector, air accumulator, first
Magnetic valve, second solenoid valve, Venturi tube, blender and control device, blender include import and relative with import and with entering
The outlet of mouth connection, injector are installed in the side wall of blender, and air accumulator passes through the first magnetic valve and distinguishes gas circuit connection second
Magnetic valve and fluid reservoir, fluid reservoir and injector fluid connection, second solenoid valve gas circuit connection Venturi tube, Venturi tube is with mixing
The airway connection of clutch, control device electrically connect the first magnetic valve, second solenoid valve and injector, in addition to one-level decompression
The safety con-trol parts such as valve, second depressurized valve, liquid level sensor, the first temperature sensor, first pressure sensor.Though the present invention
Right energy-saving safe, it is easy to be integrated into diesel engine vent gas post processing, but it still has following defect：
First, the invention is using the expensive items such as multiple magnetic valves, multiple pressure-reducing valves and Venturi tube, such design
The initial cost of after-treatment system is added, while also increases the O＆M cost of user, is unfavorable for after-treatment system
Production domesticization；
Secondly, the gas in the invention air accumulator is directly the urea liquid pressurising in fluid reservoir, and this to deposit in gas
Pollutant easily pollute urea liquid, reduce the reliability of system.
The content of the invention
The purpose of the present invention is to overcome the defects of cost present in prior art is high, system reliability is low and problem, is carried
For the air-assisted atomized urea spraying system and its control method that a kind of cost is low, system reliability is high.
To realize object above, technical solution of the invention is：A kind of air-assisted atomized urea spraying system, bag
Source of the gas, gasbag pressure tank, injection line system are included, the source of the gas is connected with gasbag pressure tank gas circuit, gasbag pressure tank and injection
Pipe-line system fluid path is connected, and injection line system is connected with control unit signal；
The gasbag pressure tank is internally provided with urea liquid area, air bag, and air bag, air bag are provided with urea liquid area
It is connected successively after the gas outlet through two position three-way valve, the air inlet of two position three-way valve, pressure maintaining valve with source of the gas gas circuit, air bag passes through successively
Communicated after the gas outlet of two position three-way valve, the exhaust outlet of two position three-way valve with air, the injection line system include metering valve,
Nozzle, hybrid chamber, nozzle are connected after blended chamber, metering valve with urea liquid area fluid path successively, and the hybrid chamber is successively through gas
It is connected after dynamic switch valve, gas outlet, air inlet, pressure maintaining valve with source of the gas gas circuit, the two position three-way valve, metering valve are single with control
First signal connection.
Pressure sensor, liquid level sensor, temperature sensor, pressure sensor, liquid are provided with the gasbag pressure tank
Level sensor, temperature sensor are all connected with control unit signal.
It is provided with the top of the gasbag pressure tank and increases liquid mouth, is increased and increasing liquid lid is provided with liquid mouth, gasbag pressure tank
Bottom is provided with the filter being connected with metering valve fluid path.
The hybrid chamber is internally provided with the throttle orifice being connected with pneumatic on-off valve gas circuit, and mixing is provided with hybrid chamber
Cavity pressure sensor, mixing chamber pressure sensor are connected with control unit signal.
The air-assisted atomized urea spraying system also includes SCR postprocessor, the air inlet of SCR postprocessor and row
Tracheae gas circuit is connected, and blast pipe is connected after nozzle, hybrid chamber, metering valve with urea liquid area fluid path successively.
Be provided with SCR postprocessor temperature sensor in the SCR postprocessor, SCR postprocessor temperature sensor with
Control unit signal connects.
The source of the gas is high-pressure gas cylinder or air compressor.
The pressure maintaining valve is electric-controlled type pressure maintaining valve or mechanical pressure maintaining valve, when pressure maintaining valve is electric-controlled type pressure maintaining valve, voltage stabilizing
Valve is connected with control unit signal.
A kind of control method of air-assisted atomized urea spraying system, the control method comprise the following steps：
Pressure maintaining valve is first connected, then controls two position three-way valve to be powered by control unit, so that air inlet is connected with gas outlet,
Then control source of the gas to be pressurized successively behind pressure maintaining valve, air inlet, gas outlet to airbag aeration, then connect pneumatic on-off valve, then
Control source of the gas sprays after pressure maintaining valve, air inlet, gas outlet, pneumatic on-off valve, hybrid chamber, nozzle successively, when system needs to spray
When penetrating urea liquid, then by control unit control metering valve connection, now, air bag gives urea liquid area to pressurize, urea liquid
The urea liquid in area sprays after metering valve with the gas mixing in hybrid chamber, the gas solution of mixing after nozzle, until being
When system needs to stop urea injection, then metering valve is controlled to close by control unit, now, the urea liquid in urea liquid area
Stop entering hybrid chamber, the gas in source of the gas enters hybrid chamber and nozzle after pneumatic on-off valve, with to injection line system
Purged, then control two position three-way valve to power off by control unit, now, gas outlet is connected with exhaust outlet, the gas in air bag
Body leads to air after gas outlet, exhaust outlet successively, and deflation pressure release is carried out to air bag, and now, the control method terminates.
The hybrid chamber is internally provided with the throttle orifice being connected with pneumatic on-off valve gas circuit；
The air-assisted atomized urea spraying system also includes SCR postprocessor, the air inlet of SCR postprocessor and row
Tracheae gas circuit is connected, and blast pipe is connected after nozzle, hybrid chamber, metering valve with urea liquid area fluid path successively；
The control source of the gas sprays after pressure maintaining valve, air inlet, gas outlet, pneumatic on-off valve, hybrid chamber, nozzle successively
Refer to：Source of the gas is controlled successively after pressure maintaining valve, air inlet, gas outlet, pneumatic on-off valve, throttle orifice, hybrid chamber, nozzle to blast pipe
Spray into；
The urea liquid in the urea liquid area after metering valve with the gas mixing in hybrid chamber, the gas solution of mixing
Spray and refer to after nozzle：The urea liquid in urea liquid area after metering valve with the gas mixing in hybrid chamber, the gas of mixing
Liquid solution is after nozzle to exhaust pipe inspection.
Compared with prior art, beneficial effects of the present invention are：
1st, due to the urine of gasbag pressure tank in a kind of air-assisted atomized urea spraying system of the present invention and its control method
Air bag is provided with plain solution area, air bag is connected after two position three-way valve, pressure maintaining valve with source of the gas gas circuit successively, and air bag is through two three
Communicated after port valve with air, injection line system includes metering valve, nozzle, hybrid chamber, and nozzle is successively after blended chamber, metering valve
It is connected with urea liquid area fluid path, hybrid chamber connects after pneumatic on-off valve, two position three-way valve, pressure maintaining valve with source of the gas gas circuit successively
Connecing, two position three-way valve, metering valve are connected with control unit signal, on the one hand such design eliminates the parts of costliness,
The initial cost of after-treatment system is effectively reduced, while reduces the O＆M cost of user, is advantageous to after-treatment system
Production domesticization, on the other hand set air bag to give urea liquid pressurising using in gasbag pressure tank, effectively prevent in source of the gas
Pollution of the existing pollutant to urea liquid, system reliability is improved, while making for the consumptive materials such as pneumatic filter can be saved
With.Therefore, not only cost is low by the present invention, and system reliability is high.
2nd, due in a kind of air-assisted atomized urea spraying system of the present invention and its control method source of the gas successively through voltage stabilizing
It is pressurized after valve, two position three-way valve to airbag aeration, air bag pressurizes to urea liquid area, and the urea liquid in urea liquid area passes through successively
Sprayed after metering valve, hybrid chamber, nozzle, until when system needs to stop urea injection, the urea liquid in urea liquid area stops
Spray, the gas in air bag leads to air after two position three-way valve, and deflation pressure release is carried out to air bag, such to design not only structure
It is simple and convenient to operate, and pressurising and pressure release is carried out to air bag by pressure maintaining valve, two position three-way valve, metering valve import can be maintained
End pressure is basicly stable, and the emitted dose of metering valve is inaccurate caused by reducing the injection of urea liquid pressure pulse.Therefore, originally
Invention is not only simple in structure, is easy to operate, and improves the Stability and veracity of urea injecting quantity.
3rd, due to injection line system bag in a kind of air-assisted atomized urea spraying system of the present invention and its control method
Include metering valve, nozzle, hybrid chamber, nozzle is connected after blended chamber, metering valve with urea liquid area fluid path successively, the hybrid chamber
It is connected successively after pneumatic on-off valve, gas outlet, air inlet, pressure maintaining valve with source of the gas gas circuit, in control process, into hybrid chamber
Gas sprays into blast pipe after the urea liquid of hybrid chamber mixes with entering through nozzle, and such design can improve urea atomization matter
Amount, can improve SCR conversion efficiency and can prevent the generation of urea crystals.Therefore, the present invention not only increases urea atomization matter
Amount, SCR conversion efficiency, and the generation of urea crystals can be prevented.
4th, due to being set in a kind of air-assisted atomized urea spraying system of the present invention and its control method on gasbag pressure tank
Be equipped with pressure sensor, liquid level sensor, temperature sensor, pressure sensor, liquid level sensor, temperature sensor all with control
Cell signal connects, and control unit controls the switch of pressure maintaining valve, the switch of two position three-way valve, metering valve according to the signal of collection
Switch and emitted dose, such design not only increases the reliability of system, and improves the accuracy of urea injecting quantity
And stability.Therefore, the present invention not only increases the reliability of system, and improves the accuracy and stably of urea injecting quantity
Property.
5th, because the inside of hybrid chamber in a kind of air-assisted atomized urea spraying system of the present invention and its control method is set
The throttle orifice being connected with pneumatic on-off valve gas circuit is equipped with, mixing chamber pressure sensor is provided with hybrid chamber, mixing chamber pressure passes
Sensor is connected with control unit signal, and in control process, the gas flow of hybrid chamber is entered by pressure maintaining valve and orifices controls, and
Ensure the pressure stability of hybrid chamber, improve the operating accuracy of metering valve, so as to improve the accuracy of urea injecting quantity and steady
It is qualitative.Therefore, the present invention improves the Stability and veracity of urea injecting quantity.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention（Pressure maintaining valve is electric-controlled type pressure maintaining valve）.
Fig. 2 is the structural representation of the present invention（Pressure maintaining valve is mechanical pressure maintaining valve）.
In figure：Source of the gas 1, gasbag pressure tank 2, urea liquid area 21, air bag 22, pressure sensor 23, liquid level sensor 24,
Temperature sensor 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, air inlet 61, go out
Gas port 62, exhaust outlet 63, pneumatic on-off valve 7, SCR postprocessor 8, SCR postprocessor temperature sensor 81, blast pipe 82.
Embodiment
Below in conjunction with brief description of the drawings, the present invention is further detailed explanation with embodiment.
Referring to Fig. 1 to Fig. 2, a kind of air-assisted atomized urea spraying system, including source of the gas 1, gasbag pressure tank 2, injection
Pipe-line system 3, the source of the gas 1 are connected with the gas circuit of gasbag pressure tank 2, and gasbag pressure tank 2 is connected with the fluid path of injection line system 3,
Injection line system 3 is connected with the signal of control unit 4；
The gasbag pressure tank 2 is internally provided with urea liquid area 21, air bag 22, and gas is provided with urea liquid area 21
Capsule 22, air bag 22 successively after the gas outlet 62 through two position three-way valve 6, the air inlet 61 of two position three-way valve 6, pressure maintaining valve 5 with source of the gas 1
Gas circuit connect, air bag 22 successively the gas outlet 62 through two position three-way valve 6, two position three-way valve 6 exhaust outlet 63 after communicated with air,
The injection line system 3 includes metering valve 31, nozzle 32, hybrid chamber 33, and nozzle 32 is successively after blended chamber 33, metering valve 31
It is connected with the fluid path of urea liquid area 21, the hybrid chamber 33 is successively through pneumatic on-off valve 7, gas outlet 62, air inlet 61, pressure maintaining valve
It is connected after 5 with the gas circuit of source of the gas 1, the two position three-way valve 6, metering valve 31 are connected with the signal of control unit 4.
Pressure sensor 23, liquid level sensor 24, temperature sensor 25 are provided with the gasbag pressure tank 2, pressure passes
Sensor 23, liquid level sensor 24, temperature sensor 25 are all connected with the signal of control unit 4.
The top of the gasbag pressure tank 2, which is provided with, increases liquid mouth 26, increases and increasing liquid lid 27, air bag pressure are provided with liquid mouth 26
The bottom of power tank 2 is provided with the filter 28 being connected with the fluid path of metering valve 31.
The hybrid chamber 33 is internally provided with the throttle orifice 331 being connected with the gas circuit of pneumatic on-off valve 7, is set on hybrid chamber 33
Mixing chamber pressure sensor 332 is equipped with, mixing chamber pressure sensor 332 is connected with the signal of control unit 4.
The air-assisted atomized urea spraying system also includes SCR postprocessor 8, the air inlet of SCR postprocessor 8 with
The gas circuit of blast pipe 82 connects, and blast pipe 82 connects after nozzle 32, hybrid chamber 33, metering valve 31 with the fluid path of urea liquid area 21 successively
Connect.
SCR postprocessor temperature sensor 81, SCR postprocessor temperature sensor are provided with the SCR postprocessor 8
81 are connected with the signal of control unit 4.
The source of the gas 1 is high-pressure gas cylinder or air compressor.
The pressure maintaining valve 5 is electric-controlled type pressure maintaining valve or mechanical pressure maintaining valve, when pressure maintaining valve 5 is electric-controlled type pressure maintaining valve, surely
Pressure valve 5 is connected with the signal of control unit 4.
A kind of control method of air-assisted atomized urea spraying system, the control method comprise the following steps：
Pressure maintaining valve 5 is first connected, then controls two position three-way valve 6 to be powered by control unit 4, so that air inlet 61 and gas outlet
62 connect, and then control source of the gas 1 to give the plenum of air bag 22 behind pressure maintaining valve 5, air inlet 61, gas outlet 62 successively, then connect
Pneumatic on-off valve 7, source of the gas 1 is then controlled successively through pressure maintaining valve 5, air inlet 61, gas outlet 62, pneumatic on-off valve 7, hybrid chamber
33rd, sprayed after nozzle 32, control metering valve 31 to connect when system needs to spray urea liquid, then by control unit 4, this
When, air bag 22 pressurizes to urea liquid area 21, the urea liquid in urea liquid area 21 after metering valve 31 with hybrid chamber 33
Gas mixing, the gas solution of mixing spray after nozzle 32, until when system needs to stop urea injection, then pass through control
Unit 4 controls metering valve 31 to close, and now, the urea liquid in urea liquid area 21 stops entering hybrid chamber 33, the gas in source of the gas 1
Body enters hybrid chamber 33 and nozzle 32 after pneumatic on-off valve 7, to be purged to injection line system 3, then it is single by controlling
Member 4 controls two position three-way valve 6 to power off, and now, gas outlet 62 is connected with exhaust outlet 63, and the gas in air bag 22 is successively through gas outlet
62nd, lead to air after exhaust outlet 63, deflation pressure release is carried out to air bag 22, now, the control method terminates.
The hybrid chamber 33 is internally provided with the throttle orifice 331 being connected with the gas circuit of pneumatic on-off valve 7；
The air-assisted atomized urea spraying system also includes SCR postprocessor 8, the air inlet of SCR postprocessor 8 with
The gas circuit of blast pipe 82 connects, and blast pipe 82 connects after nozzle 32, hybrid chamber 33, metering valve 31 with the fluid path of urea liquid area 21 successively
Connect；
The control source of the gas 1 is successively through pressure maintaining valve 5, air inlet 61, gas outlet 62, pneumatic on-off valve 7, hybrid chamber 33, spray
Spray and refer to after mouth 32：Source of the gas 1 is controlled successively through pressure maintaining valve 5, air inlet 61, gas outlet 62, pneumatic on-off valve 7, throttle orifice
331st, sprayed into after hybrid chamber 33, nozzle 32 to blast pipe 82；
The urea liquid in the urea liquid area 21 after metering valve 31 with the gas mixing in hybrid chamber 33, the gas of mixing
Liquid solution sprays after nozzle 32 to be referred to：The urea liquid in urea liquid area 21 after metering valve 31 with the gas in hybrid chamber 33
Mixing, the gas solution of mixing spray after nozzle 32 to blast pipe 82.
The principle of the present invention is described as follows：
1st, source of the gas 1：Referring to Fig. 1 to Fig. 2, source of the gas 1 can be mini air compressor, or air storage tank, its
The outlet pressure of middle-size and small-size air compressor is typically 0.8Mpa -1Mpa, and both sources of the gas are applied to various car and boat, for using
The automobile of pneumatic brake, source of the gas 1 can also be used as by the use of original air compressor machine and air accumulator.
2nd, pressure maintaining valve 5：Referring to Fig. 1 to Fig. 2, the gas of source of the gas 1 becomes the gas of stable gas pressure, surely after pressure maintaining valve 5
Whether electric-controlled type pressure maintaining valve or mechanical pressure maintaining valve, its gas outlet pressure limit are 0.5Mpa -0.9Mpa to pressure valve 5,
The one of values of 0.5Mpa -0.9Mpa can be set as needed.
3rd, two position three-way valve 6：Referring to Fig. 1 to Fig. 2, have in two position three-way valve 6 three gas inlet and outlet joints, one electrically
Joint, wherein three gas inlet and outlet joints are respectively the gas outlet 62, one of air inlet 61, one exhaust outlet 63, electrically
Joint is connected with the signal of control unit 4.
When two position three-way valve 6 is powered, air inlet 61 is connected with gas outlet 62, and source of the gas 1 is successively through pressure maintaining valve 5, air inlet
61st, the plenum of air bag 22 of gasbag pressure tank 2 is given behind gas outlet 62；When 6 no power of two position three-way valve, gas outlet 62 and row
Gas port 63 is connected, and air bag 22 communicates after gas outlet 62, exhaust outlet 63 with air successively, with to the deflation pressure release of air bag 22.
4th, gasbag pressure tank 2：Referring to Fig. 1 to Fig. 2, gasbag pressure tank 2 is internally provided with urea liquid area 21, air bag
22, air bag 22 is provided with urea liquid area 21, and gasbag pressure tank 2 is pressure vessel, by source of the gas 1 in gasbag pressure tank 2
Air bag 22 provides pressure, and the operating pressure of gasbag pressure tank 2 is 0.5Mpa -1.2 Mpa.
Pressure sensor 23, liquid level sensor 24, temperature sensor 25 are provided with the gasbag pressure tank 2, pressure passes
Sensor 23, liquid level sensor 24, temperature sensor 25 are all connected with the signal of control unit 4；It is molten that pressure sensor 23 measures urea
The pressure of liquid simultaneously feeds back to control unit 4, and liquid level sensor 24 measures the liquid level of urea liquid and feeds back to control unit
4, temperature sensor 25 measures the temperature of urea liquid and feeds back to control unit 4.
The top of the gasbag pressure tank 2, which is provided with, increases liquid mouth 26, increases and increasing liquid lid 27 is provided with liquid mouth 26, increase liquid mouth
26 are used into gasbag pressure tank 2 increase urea liquid, increase liquid lid 27 and are used to prevent introduced contaminants from entering gasbag pressure tank 2
In；The bottom of gasbag pressure tank 2 is provided with the filter 28 being connected with the fluid path of metering valve 31, and filter 28 is used to prevent that urea is molten
Impurity in liquid is entered in metering valve 31.
5th, metering valve 31：Referring to Fig. 1 to Fig. 2, the keying of metering valve 31 is controlled by control unit 4, and control unit 4 is according to hair
The regulation such as the operating condition of motivation and running environment determines, controls metering valve 31 to work by control signal, and control unit 4 is logical
The opening time for crossing control metering valve 31 determines the emitted dose of urea liquid.
6th, pneumatic on-off valve 7：Referring to Fig. 1 to Fig. 2, the hybrid chamber 33 after pneumatic on-off valve 7 with the gas circuit of gas outlet 62
Connect, in control process, when pressure reaches certain value, pneumatic on-off valve 7 is opened on gas pressure top；When the urine in urea liquid area 21
Plain solution stops entering hybrid chamber 33, and the gas in source of the gas 1 enters hybrid chamber 33 and nozzle 32 after pneumatic on-off valve 7, to spraying
The remaining urea liquid penetrated in pipe-line system 3 is purged, and prevents urea liquid from producing crystallization to injection line system 3 and nozzle
Block.
7th, hybrid chamber 33：Referring to Fig. 1 to Fig. 2, the hybrid chamber 33 is successively through pneumatic on-off valve 7, gas outlet 62, air inlet
61st, be connected after pressure maintaining valve 5 with the gas circuit of source of the gas 1, hybrid chamber 33 successively after metering valve 31, filter 28 with the liquid of urea liquid area 21
Road connects, and in control process, the gas in source of the gas 1 is successively after pressure maintaining valve 5, air inlet 61, gas outlet 62, pneumatic on-off valve 7
Into hybrid chamber 33, the urea liquid in urea liquid area 21 enters hybrid chamber 33 by filter 28, metering valve 31 successively, into mixed
The gas of conjunction chamber 33 is sprayed into blast pipe 82 after being mixed with the urea liquid of entrance hybrid chamber 33 after nozzle 32.
The hybrid chamber 33 is internally provided with the throttle orifice 331 being connected with the gas circuit of pneumatic on-off valve 7, and throttle orifice 331 is used
Gas flow in control into hybrid chamber 33；Mixing chamber pressure sensor 332, mixing chamber pressure sensing are provided with hybrid chamber 33
Device 332 is connected with the signal of control unit 4, and mixing chamber pressure sensor 332 measures the pressure of hybrid chamber 33 and feeds back to control list
Member 4.
8th, control unit 4：Referring to Fig. 1 to Fig. 2, the input signal of described control unit 4 is pressure sensor 23, liquid level biography
Sensor 24, temperature sensor 25, mixing chamber pressure sensor 332, SCR postprocessor temperature sensor 81 output signal and
The various signals such as the oil temperature that is measured on engine, water temperature, load, rotating speed, and phase is exported according to the program of setting by control unit 4
The control signal answered controls the switch of the switch of pressure maintaining valve 5, switch and the emitted dose of metering valve 31, two position three-way valve 6, simultaneously
Judge whether system is normal.
9th, referring to Fig. 1 to Fig. 2, the urea liquid in gasbag pressure tank 2, in the presence of the pressure of air bag 22, urea liquid
By filter 28, metering valve 31, hybrid chamber 33, nozzle 32, quantitative urea liquid is sprayed into row under the control of control unit 4
In tracheae 82, urea liquid at a certain temperature by pyrolysis and hydrolysis generation ammonia, ammonia under catalyst action
The NOx discharges in exhaust are reduced to nitrogen in SCR postprocessor 8, reach the effect for reducing NOx in exhaust.
Embodiment 1：
Referring to Fig. 1 to Fig. 2, a kind of air-assisted atomized urea spraying system, including source of the gas 1, gasbag pressure tank 2, injection
Pipe-line system 3, the source of the gas 1 are connected with the gas circuit of gasbag pressure tank 2, and gasbag pressure tank 2 is connected with the fluid path of injection line system 3,
Injection line system 3 is connected with the signal of control unit 4, and the gasbag pressure tank 2 is internally provided with urea liquid area 21, air bag
22, it is provided with air bag 22 in urea liquid area 21, air bag 22 gas outlet 62 through two position three-way valve 6, two position three-way valve 6 successively
It is connected after air inlet 61, pressure maintaining valve 5 with the gas circuit of source of the gas 1, air bag 22 gas outlet 62 through two position three-way valve 6, two-position three way successively
Communicated after the exhaust outlet 63 of valve 6 with air, the injection line system 3 includes metering valve 31, nozzle 32, hybrid chamber 33, nozzle
32 are connected after blended chamber 33, metering valve 31 with the fluid path of urea liquid area 21 successively, and the hybrid chamber 33 is successively through jettron
Be connected after valve 7, gas outlet 62, air inlet 61, pressure maintaining valve 5 with the gas circuit of source of the gas 1, the two position three-way valve 6, metering valve 31 with control
The signal of unit 4 connection processed.
By such scheme, a kind of control method of air-assisted atomized urea spraying system, the control method include with
Lower step：Pressure maintaining valve 5 is first connected, then controls two position three-way valve 6 to be powered by control unit 4, so that air inlet 61 and gas outlet
62 connect, and then control source of the gas 1 to give the plenum of air bag 22 behind pressure maintaining valve 5, air inlet 61, gas outlet 62 successively, then connect
Pneumatic on-off valve 7, source of the gas 1 is then controlled successively through pressure maintaining valve 5, air inlet 61, gas outlet 62, pneumatic on-off valve 7, hybrid chamber
33rd, sprayed after nozzle 32, control metering valve 31 to connect when system needs to spray urea liquid, then by control unit 4, this
When, air bag 22 pressurizes to urea liquid area 21, the urea liquid in urea liquid area 21 after metering valve 31 with hybrid chamber 33
Gas mixing, the gas solution of mixing spray after nozzle 32, until when system needs to stop urea injection, then pass through control
Unit 4 controls metering valve 31 to close, and now, the urea liquid in urea liquid area 21 stops entering hybrid chamber 33, the gas in source of the gas 1
Body enters hybrid chamber 33 and nozzle 32 after pneumatic on-off valve 7, to be purged to injection line system 3, then it is single by controlling
Member 4 controls two position three-way valve 6 to power off, and now, gas outlet 62 is connected with exhaust outlet 63, and the gas in air bag 22 is successively through gas outlet
62nd, lead to air after exhaust outlet 63, deflation pressure release is carried out to air bag 22, now, the control method terminates.
Embodiment 2：
With embodiment 1, difference is substance：
Referring to Fig. 1 to Fig. 2, pressure sensor 23, liquid level sensor 24, temperature are provided with the gasbag pressure tank 2 and is passed
Sensor 25, pressure sensor 23, liquid level sensor 24, temperature sensor 25 are all connected with the signal of control unit 4；The air bag pressure
The top of power tank 2, which is provided with, increases liquid mouth 26, increases and increasing liquid lid 27 is provided with liquid mouth 26, the bottom of gasbag pressure tank 2 is provided with
The filter 28 being connected with the fluid path of metering valve 31.
Embodiment 3：
With embodiment 1, difference is substance：
Referring to Fig. 1 to Fig. 2, the hybrid chamber 33 is internally provided with the throttle orifice being connected with the gas circuit of pneumatic on-off valve 7
331, mixing chamber pressure sensor 332 is provided with hybrid chamber 33, mixing chamber pressure sensor 332 connects with the signal of control unit 4
Connect；The air-assisted atomized urea spraying system also includes SCR postprocessor 8, the air inlet of SCR postprocessor 8 and exhaust
The gas circuit of pipe 82 is connected, and blast pipe 82 is connected after nozzle 32, hybrid chamber 33, metering valve 31 with the fluid path of urea liquid area 21 successively,
SCR postprocessor temperature sensor 81, SCR postprocessor temperature sensor 81 and control are provided with the SCR postprocessor 8
The signal of unit 4 connects.
The control source of the gas 1 is successively through pressure maintaining valve 5, air inlet 61, gas outlet 62, pneumatic on-off valve 7, hybrid chamber 33, spray
Spray and refer to after mouth 32：Source of the gas 1 is controlled successively through pressure maintaining valve 5, air inlet 61, gas outlet 62, pneumatic on-off valve 7, throttle orifice
331st, sprayed into after hybrid chamber 33, nozzle 32 to blast pipe 82；The urea liquid in the urea liquid area 21 after metering valve 31 with
Gas mixing in hybrid chamber 33, the gas solution of mixing sprays after nozzle 32 to be referred to：The urea liquid in urea liquid area 21
Sprayed after metering valve 31 with the gas mixing in hybrid chamber 33, the gas solution of mixing after nozzle 32 to blast pipe 82.
Embodiment 4：
With embodiment 1, difference is substance：
Referring to Fig. 1 to Fig. 2, the source of the gas 1 is high-pressure gas cylinder or air compressor；The pressure maintaining valve 5 is that electric-controlled type is steady
Pressure valve or mechanical pressure maintaining valve, when pressure maintaining valve 5 is electric-controlled type pressure maintaining valve, pressure maintaining valve 5 is connected with the signal of control unit 4.
Claims (9)
1. a kind of air-assisted atomized urea spraying system, including source of the gas（1）, gasbag pressure tank（2）, injection line system（3）,
The source of the gas（1）With gasbag pressure tank（2）Gas circuit connects, gasbag pressure tank（2）With injection line system（3）Fluid path connects, spray
Penetrate pipe-line system（3）With control unit（4）Signal connects, it is characterised in that：
The gasbag pressure tank（2）Be internally provided with urea liquid area（21）, air bag（22）, urea liquid area（21）Upper setting
There is air bag（22）, air bag（22）Successively through two position three-way valve（6）Gas outlet（62）, two position three-way valve（6）Air inlet（61）、
Pressure maintaining valve（5）Afterwards with source of the gas（1）Gas circuit connects, air bag（22）Successively through two position three-way valve（6）Gas outlet（62）, two-position three way
Valve（6）Exhaust outlet（63）Communicated afterwards with air, the injection line system（3）Including metering valve（31）, nozzle（32）, mixing
Chamber（33）, nozzle（32）Blended chamber successively（33）, metering valve（31）Afterwards with urea liquid area（21）Fluid path connects, the mixing
Chamber（33）Successively through pneumatic on-off valve（7）, gas outlet（62）, air inlet（61）, pressure maintaining valve（5）Afterwards with source of the gas（1）Gas circuit connects,
The two position three-way valve（6）, metering valve（31）And control unit（4）Signal connects；
The hybrid chamber（33）Be internally provided with and pneumatic on-off valve（7）The throttle orifice of gas circuit connection（331）, hybrid chamber（33）
On be provided with mixing chamber pressure sensor（332）, mixing chamber pressure sensor（332）With control unit（4）Signal connects.
A kind of 2. air-assisted atomized urea spraying system according to claim 1, it is characterised in that：The gasbag pressure
Tank（2）On be provided with pressure sensor（23）, liquid level sensor（24）, temperature sensor（25）, pressure sensor（23）, liquid level
Sensor（24）, temperature sensor（25）All with control unit（4）Signal connects.
A kind of 3. air-assisted atomized urea spraying system according to claim 1, it is characterised in that：The gasbag pressure
Tank（2）Top be provided with increase liquid mouth（26）, increase liquid mouth（26）On be provided with increase liquid lid（27）, gasbag pressure tank（2）Bottom
Portion is provided with and metering valve（31）The filter of fluid path connection（28）.
A kind of 4. air-assisted atomized urea spraying system according to claim 1, it is characterised in that：The air auxiliary
Atomization urea injection system also includes SCR postprocessor（8）, SCR postprocessor（8）Air inlet and blast pipe（82）Gas circuit connects
Connect, blast pipe（82）Successively through nozzle（32）, hybrid chamber（33）, metering valve（31）Afterwards with urea liquid area（21）Fluid path connects.
A kind of 5. air-assisted atomized urea spraying system according to claim 4, it is characterised in that：Locate after the SCR
Manage device（8）On be provided with SCR postprocessor temperature sensor（81）, SCR postprocessor temperature sensor（81）With control unit
（4）Signal connects.
A kind of 6. air-assisted atomized urea spraying system according to any one in claim 1-5, it is characterised in that：
The source of the gas（1）For high-pressure gas cylinder or air compressor.
A kind of 7. air-assisted atomized urea spraying system according to any one in claim 1-5, it is characterised in that：
The pressure maintaining valve（5）For electric-controlled type pressure maintaining valve or mechanical pressure maintaining valve, work as pressure maintaining valve（5）For electric-controlled type pressure maintaining valve when, pressure maintaining valve
（5）With control unit（4）Signal connects.
A kind of 8. control method of the air-assisted atomized urea spraying system described in claim 1, it is characterised in that：The control
Method processed comprises the following steps：
First connect pressure maintaining valve（5）, then pass through control unit（4）Control two position three-way valve（6）It is powered, so that air inlet（61）With going out
Gas port（62）Connect, then control source of the gas（1）Successively through pressure maintaining valve（5）, air inlet（61）, gas outlet（62）Air bag is given afterwards（22）
Plenum, then connect pneumatic on-off valve（7）, then control source of the gas（1）Successively through pressure maintaining valve（5）, air inlet（61）, gas outlet
（62）, pneumatic on-off valve（7）, hybrid chamber（33）, nozzle（32）After spray, when system needs to spray urea liquid, then pass through
Control unit（4）Control metering valve（31）Connect, now, air bag（22）Give urea liquid area（21）Pressurization, urea liquid area
（21）Urea liquid through metering valve（31）Afterwards with hybrid chamber（33）In gas mixing, the gas solution of mixing is through nozzle（32）
After spray, until system need stop urea injection when, then pass through control unit（4）Control metering valve（31）Close, now,
Urea liquid area（21）Urea liquid stop enter hybrid chamber（33）, source of the gas（1）In gas through pneumatic on-off valve（7）It is laggard
Enter hybrid chamber（33）And nozzle（32）, with to injection line system（3）Purged, then pass through control unit（4）Control two
Triple valve（6）Power-off, now, gas outlet（62）With exhaust outlet（63）Connect, air bag（22）In gas successively through gas outlet
（62）, exhaust outlet（63）After lead to air, to air bag（22）Deflation pressure release is carried out, now, the control method terminates.
A kind of 9. control method of air-assisted atomized urea spraying system according to claim 8, it is characterised in that：
The hybrid chamber（33）Be internally provided with and pneumatic on-off valve（7）The throttle orifice of gas circuit connection（331）；
The air-assisted atomized urea spraying system also includes SCR postprocessor（8）, SCR postprocessor（8）Air inlet with
Blast pipe（82）Gas circuit connects, blast pipe（82）Successively through nozzle（32）, hybrid chamber（33）, metering valve（31）Afterwards with urea liquid
Area（21）Fluid path connects；
The control source of the gas（1）Successively through pressure maintaining valve（5）, air inlet（61）, gas outlet（62）, pneumatic on-off valve（7）, hybrid chamber
（33）, nozzle（32）Spray and refer to afterwards：Control source of the gas（1）Successively through pressure maintaining valve（5）, air inlet（61）, gas outlet（62）, it is pneumatic
Switch valve（7）, throttle orifice（331）, hybrid chamber（33）, nozzle（32）Backward blast pipe（82）Spray into；
The urea liquid area（21）Urea liquid through metering valve（31）Afterwards with hybrid chamber（33）In gas mixing, mixing
Gas solution is through nozzle（32）Injection refers to afterwards：Urea liquid area（21）Urea liquid through metering valve（31）Afterwards with hybrid chamber
（33）In gas mixing, the gas solution of mixing is through nozzle（32）Backward blast pipe（82）Injection.
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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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107687358A (en) * | 2016-08-04 | 2018-02-13 | 广州市新力汽车技术有限公司 | The control method of air-assisted gas drive SCR system |
| CN106837490A (en) * | 2017-03-30 | 2017-06-13 | 凯德斯环保科技（烟台）有限公司 | A kind of auxiliary formula urea injection apparatus of the gas for emptying |
| CN109030679A (en) * | 2018-07-19 | 2018-12-18 | 浙江赛鹭鑫仪器有限公司 | A kind of second level pyrolysis analysis system |
| EP3741968B1 (en) * | 2019-04-26 | 2024-10-30 | Liebherr-Components Colmar SAS | Reductant dosing system for an scr catalyst |
| 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 |
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