CN107420164A - Urea injection system with external urea nozzle air cooling branch and application method - Google Patents
Urea injection system with external urea nozzle air cooling branch and application method Download PDFInfo
- Publication number
- CN107420164A CN107420164A CN201710297109.XA CN201710297109A CN107420164A CN 107420164 A CN107420164 A CN 107420164A CN 201710297109 A CN201710297109 A CN 201710297109A CN 107420164 A CN107420164 A CN 107420164A
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- China
- Prior art keywords
- urea
- nozzle
- measuring pump
- injection system
- air
- Prior art date
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- Granted
Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 307
- 239000004202 carbamide Substances 0.000 title claims abstract description 307
- 238000001816 cooling Methods 0.000 title claims abstract description 81
- 238000002347 injection Methods 0.000 title claims abstract description 60
- 239000007924 injection Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims description 17
- 239000000243 solution Substances 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 62
- 238000007599 discharging Methods 0.000 claims description 25
- 241000237970 Conus <genus> Species 0.000 claims description 13
- 238000002360 preparation method Methods 0.000 claims description 9
- 210000002700 urine Anatomy 0.000 claims description 7
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 31
- 239000007921 spray Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000036413 temperature sense 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]
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The urea injection system comprises a urea metering pump, a urea tank, a compressed air source, a urea nozzle, a nozzle cooling pipe and a cooling air electromagnetic valve, wherein the urea nozzle sequentially comprises an inner pipeline, a nozzle inner cavity and an outer pipe cover from inside to outside, the top end of the inner pipeline is sequentially communicated with the urea tank through the injection pipe and the urea metering pump, the bottom end of the inner pipeline is communicated with an automobile exhaust emission pipeline connected with an SCR post-processor, and the nozzle inner cavity is communicated with the compressed air source through the nozzle cooling pipe. When the device is used, cooling air cools the outer wall of the inner pipeline through the nozzle cooling pipe and the nozzle inner cavity in sequence, and compressed air cools the inner wall of the inner pipeline through the urea metering pump and the injection pipe in sequence. The design can not only ensure that the urea solution in the urea nozzle can not be crystallized, avoid blocking the urea injection system, but also has higher control accuracy and stronger cooling effect.
Description
Technical field
The present invention relates to a kind of urea injection system, belongs to internal-combustion engines exhaust gas purifying system, more particularly to a kind of urine in addition
The urea injection system and application method of plain nozzle air cooling branch road, it is particularly applicable to prevent urea nozzle from crystallizing, avoid blocking up
Urea injection system is filled in, being particularly suitable for use in reduces SCR (the Selective Catalyst of Diesel NOx discharge
Reduction) selective catalytic reduction system operating.
Background technology
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, and is required for being powered from battery to the electrodynamic pump in automobile and other car and boat, increases the loss of battery electric energy.
In addition, urea nozzle is set directly in the blast pipe of high temperature, the high temperature of blast pipe is easily caused the urea liquid in urea nozzle
Crystallization so that urea measuring pump is unable to normal injection urea, or even can damage urea measuring pump in itself, not only increases vehicle and uses
Maintenance cost, and cause actual discharge of the vehicle after urea injection blocks not up to standard, pollute environment.
Application publication number is CN102691553A, and data of publication of application is that in September, 2012 application for a patent for invention of 26 days discloses
A kind of gas helps formula SCR system, including urea box, urea supply unit, nozzle, vehicle-mounted compressed air source, catalyst converter, control are single
First ACU, urea box and vehicle-mounted compressed air source connect urea supply unit by pipeline, and urea box other end connection cooling water enters
Water lines and CWR road, urea supply unit opposite side connection nozzle, nozzle face vehicle vent gas discharging pipe road, are urged
Change device to be arranged on vehicle vent gas discharging pipe road, the upstream of catalyst converter is mounted with that delivery temperature senses on vehicle vent gas discharging pipe road
Device and NOX sensor, exhaust gas temperature sensor, NOX sensor, environment temperature sensor, engine CAN bus, urea box, urine
The valve on inlet pipeline, urea supply unit before plain case electrically connect with control unit ACU, and urea supply unit is by urea feed liquor
Three sections of pipeline, urea injection line, air inlet pipeline pipeline compositions.Although the design can reduce to a certain extent system use into
This, but it still has following defect：
Urea nozzle in the design is directly held in vehicle vent gas discharging pipe road, in use, vehicle vent gas discharging pipe road
High temperature can still cause the urea liquid in urea nozzle to crystallize, and so as to block urea measuring pump, it is urinated from normal injection
Element.
The information for disclosing the background section is merely intended to understanding of the increase to the general background of the present invention, without should
It is considered as recognizing or implies that the information structure has been the prior art well known to persons skilled in the art in any form.
The content of the invention
The purpose of the present invention be the defects of overcoming the urea liquid present in prior art in urea nozzle easily to crystallize with
Problem, there is provided the urea injection for the tyre urea nozzle air cooling branch road that the urea liquid in a kind of urea nozzle will not crystallize
System and application method.
To realize object above, technical solution of the invention is：A kind of tyre urea nozzle air cooling branch road
Urea injection system, including urea measuring pump, urea tank, compressed air source and urea nozzle, the urea tank, compressed air source
Communicated with the input of urea measuring pump, the output end of urea measuring pump communicates after playpipe with one end of urea nozzle, urine
The other end of plain nozzle communicates with vehicle vent gas discharging pipe road；
The urea injection system also includes nozzle cooling tube and the cooling air magnetic valve set thereon, the urea nozzle bag
Interior conduit and outer shroud are included, the top in said inner tube road communicates with playpipe, bottom and the vehicle vent gas discharging pipe road of interior conduit
Upstream communicate, the downstream in vehicle vent gas discharging pipe road communicates with SCR postprocessor, and the outer cup of interior conduit is provided with outer shroud,
Folder is into there is nozzle chamber between interior conduit, outer shroud, and the nozzle chamber communicates with one end of nozzle cooling tube, nozzle cooling tube
The other end communicates with compressed air source.
The compressed air source is air storage tank or air compressor.
The outlet pressure of the air compressor is 0.8-1.2Mpa.
The outer shroud, the bottom of interior conduit are respectively positioned on the inside in vehicle vent gas discharging pipe road.
The outer shroud includes cylindrical portion and conus portion, and the larger diameter end of the conus portion communicates with the bottom of cylindrical portion,
The smaller diameter end of conus portion communicates with the inside in vehicle vent gas discharging pipe road, and nozzle cooling tube pass after the outer wall of cylindrical portion with
Nozzle chamber communicates.
The urea injection system also includes control unit, urea temperature sensor, urea liquid level sensor and SCR temperature
Sensor, the urea liquid level sensor are located in urea tank on the liquid level line of urea liquid, the urea temperature sensor
The inside of urea liquid in urea tank, the SCR temperature sensor are arranged in SCR postprocessor；The urea tank is led to
Cross pipette, liquid back pipe communicates with urea measuring pump, pipette, urea measuring pump junction higher than liquid back pipe, urea measure
The junction of pump, pipette, the junction of urea tank are located at urea higher than liquid back pipe, the junction of urea tank in pipette
Position in tank is extended in urea liquid；
The urea temperature sensor, urea liquid level sensor, SCR temperature sensor are connected with the signal input part of control unit
Connect, the signal output part of control unit is connected with urea measuring pump, cooling air solenoid signal.
The top in said inner tube road communicates after metering valve with the bottom of playpipe.
A kind of application method of the urea injection system of above-mentioned tyre urea nozzle air cooling branch road, the application method
Comprise the following steps successively：
Gas injection step：Pre- note operation is first carried out to urea measuring pump, in pre- note operation latter stage, opens the pressure in urea measuring pump
Contracting air duct, and cooling air magnetic valve is opened, to cool down urea nozzle in the lump；
Urea injecting step：When reaching urea injection conditions, control urea measuring pump is pumped into urea liquid to urea nozzle, this
When, cooling air magnetic valve maintains opening state with the compressed air channel in urea measuring pump；
Terminate injecting step：When engine is shut down, first urea measuring pump is controlled to stop being pumped into urea liquid to urea nozzle, then
Close cooling air magnetic valve and the compressed air channel in urea measuring pump.
Air electric valve is provided with the urea measuring pump；Compressed air channel in the urea measuring pump it is open-minded
Whether, by being controlled realization to air electric valve.
System preparation step is additionally provided with before the gas injection step, the system preparation step refers to：Start car
During power supply, control system carries out self-test to urea injection system.
Compared with prior art, beneficial effects of the present invention are：
1st, in the urea injection system and application method of tyre urea nozzle air cooling branch road of the present invention, urea nozzle is designed
Into the sandwich for being successively from the inside to the outside interior conduit, nozzle chamber, outer shroud, meanwhile, be additionally arranged nozzle cooling tube with spray
Mouth inner chamber communicates, and urea nozzle is cooled down by nozzle cooling tube during use, it is ensured that the urea flowed through in urea nozzle is molten
Liquid will not crystallize because of the high temperature of blast pipe.Therefore, the urea liquid in the present invention in urea nozzle will not crystallize, and can avoid
Block urea injection system.
2nd, in the urea injection system and application method of tyre urea nozzle air cooling branch road of the present invention, two kinds of sides are taken
Formula cools down to urea nozzle in the lump, wherein, one is that cooling air sprays through nozzle cooling tube, nozzle chamber to urea successively
Mouth produces cooling, and another is that compressed air produces cooling through urea measuring pump, playpipe, interior conduit to urea nozzle successively,
Two kinds of types of cooling are combined, and cooling effect is very strong, can effectively avoid urea crystals.Therefore, cooling of the invention effect
Fruit is stronger, and the urea liquid in urea nozzle can be made not crystallize.
3rd, in the urea injection system and application method of tyre urea nozzle air cooling branch road of the present invention, it is additionally provided with control
Unit processed to be received signal, accurately be controlled by way of transmitting, wherein, it is molten that the signal of reception includes urea in urea tank
Liquid level, the temperature of liquid, the temperature of SCR postprocessor, the signal of transmitting includes urea measuring pump, cooling air magnetic valve, with right
The temperature of urea liquid is more accurately controlled in urea nozzle, is obtained and is preferably taken precautions against effect, avoids urea crystals.Cause
This, control accuracy of the invention is higher, can effectively avoid urea crystals.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is structural representation when metering valve is provided with the present invention.
In figure：Urea measuring pump 1, urea tank 2, urea liquid 21, urea temperature sensor 22, urea liquid level sensor
23rd, compressed air source 3, urea nozzle 4, interior conduit 41, outer shroud 42, cylindrical portion 421, conus portion 422, nozzle chamber 43, meter
Measure valve 44, playpipe 5, SCR postprocessor 6, vehicle vent gas discharging pipe road 61, SCR temperature sensor 62, nozzle cooling tube 7, cold
But air solenoid valve 71, control unit 8.
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 urea injection system of tyre urea nozzle air cooling branch road, including urea metering
Pump 1, urea tank 2, compressed air source 3 and urea nozzle 4, the input of the urea tank 2, compressed air source 3 and urea measuring pump 1
End communicates, and the one end of the output end of urea measuring pump 1 with urea nozzle 4 after playpipe 5 communicates, the other end of urea nozzle 4
Communicated with vehicle vent gas discharging pipe road 61；
The urea injection system also includes nozzle cooling tube 7 and the cooling air magnetic valve 71 set thereon, the urea spray
Mouth 4 includes interior conduit 41 and outer shroud 42, and the top in said inner tube road 41 communicates with playpipe 5, the bottom of interior conduit 41 and vapour
The upstream of tail gas discharge tube 61 communicates, and the downstream in vehicle vent gas discharging pipe road 61 communicates with SCR postprocessor 6, interior conduit
41 outer cup is provided with outer shroud 42, and folder is into there is nozzle chamber 43 between interior conduit 41, outer shroud 42, and the nozzle chamber 43 is with spraying
One end of mouth cooling tube 7 communicates, and the other end of nozzle cooling tube 7 communicates with compressed air source 3.
The compressed air source 3 is air storage tank or air compressor.
The outlet pressure of the air compressor is 0.8-1.2Mpa.
The outer shroud 42, the bottom of interior conduit 41 are respectively positioned on the inside in vehicle vent gas discharging pipe road 61.
The outer shroud 42 includes cylindrical portion 421 and conus portion 422, the larger diameter end and cylindrical portion of the conus portion 422
421 bottom communicates, and the smaller diameter end of conus portion 422 communicates with the inside in vehicle vent gas discharging pipe road 61, and nozzle cooling tube 7
Communicated after passing the outer wall of cylindrical portion 421 with nozzle chamber 43.
The urea injection system also include control unit 8, urea temperature sensor 22, urea liquid level sensor 23 with
SCR temperature sensor 62, the urea liquid level sensor 23 is located in urea tank 2 on the liquid level line of urea liquid 21, described
Urea temperature sensor 22 is located at the inside of urea liquid 21 in urea tank 2, after the SCR temperature sensor 62 is arranged at SCR
On processor 6, the urea tank 2 is communicated by pipette 24, liquid back pipe 25 with urea measuring pump 1, pipette 24, urea metering
Higher than liquid back pipe 25, the junction of urea measuring pump 1, pipette 24, the junction of urea tank 2 are higher than back liquid for the junction of pump 1
The junction of pipe 25, urea tank 2, and the position in pipette 24 in urea tank 2 is extended in urea liquid 21；The urine
Plain temperature sensor 22, urea liquid level sensor 23, SCR temperature sensor 62 are connected with the signal input part of control unit 8,
The signal output part of control unit 8 is connected with urea measuring pump 1, the signal of cooling air magnetic valve 71.
Bottom of the top in said inner tube road 41 with playpipe 5 after metering valve 44 communicates.
A kind of application method of the urea injection system of above-mentioned tyre urea nozzle air cooling branch road, the application method
Comprise the following steps successively：
Gas injection step：Pre- note operation is first carried out to urea measuring pump 1, in pre- note operation latter stage, is opened in urea measuring pump 1
Compressed air channel, and cooling air magnetic valve 71 is opened, to cool down urea nozzle 4 in the lump；
Urea injecting step：When reaching urea injection conditions, control urea measuring pump 1 is pumped into urea liquid to urea nozzle 4
21, now, cooling air magnetic valve 71 maintains opening state with the compressed air channel in urea measuring pump 1；
Terminate injecting step：When engine is shut down, first urea measuring pump 1 is controlled to stop being pumped into urea liquid to urea nozzle 4
21, turn off cooling air magnetic valve 71 and the compressed air channel in urea measuring pump 1.
Air electric valve is provided with the urea measuring pump 1；Compressed air channel in the urea measuring pump 1 is opened
Whether lead to, by being controlled realization to air electric valve.
System preparation step is additionally provided with before the gas injection step, the system preparation step refers to：Start car
During power supply, control system carries out self-test to urea injection system.
The principle of the present invention is described as follows：
When the system preparation, in order to ensure that urea injection temperation is in reasonable temperature, urea crystals, control unit are avoided
Control cooling air magnetic valve 71 is opened, the outer layer channel that cooling air passes through urea nozzle 4（Enter nozzle through outer shroud 42
Inner chamber 43）With the compressed air of the inner-layer channel of urea nozzle 4（I.e. compressed air is laggard through urea measuring pump 1, playpipe 5 successively
Enter interior conduit 41）Interior conduit 41, the outside wall surface of the air cooling interior conduit 41 of outer layer channel, the compressed air of internal layer are cooled down together
The internal face of interior conduit 41 is cooled down, it is final to ensure that interior conduit 41 is unlikely to be influenceed by delivery temperature and be in high temperature, cause inner tube
Urea liquid or remaining urea in road 41 decompose and polymerisation and produce undissolvable crystal, block urea spray
Mouth.The urea liquid that cooling air in nozzle cooling tube 7 finally projects at the jet of urea nozzle 4 and in interior conduit 41
After mixing, vehicle vent gas discharging pipe road 61 is sprayed into the lump, cooling air is with urea liquid in the external mix of urea nozzle 4, urine
Plain solution is at a certain temperature by pyrolysis and hydrolysis generation ammonia, and ammonia is under catalyst action by the NOx in exhaust
Discharge is reduced to nitrogen, reaches the effect for reducing NOx in exhaust.
Embodiment 1：
Referring to Fig. 1 to Fig. 2, a kind of urea injection system of tyre urea nozzle air cooling branch road, including urea measuring pump 1,
Urea tank 2, compressed air source 3 and urea nozzle 4, the urea tank 2, the input phase of compressed air source 3 and urea measuring pump 1
Logical, the one end of the output end of urea measuring pump 1 with urea nozzle 4 after playpipe 5 communicates, the other end and vapour of urea nozzle 4
Tail gas discharge tube 61 communicates；
The urea injection system also includes nozzle cooling tube 7 and the cooling air magnetic valve 71 set thereon, the urea spray
Mouth 4 includes interior conduit 41 and outer shroud 42, and the top in said inner tube road 41 communicates with playpipe 5（Also may be used on the top of interior conduit 41
Communicated with the bottom again with playpipe 5 after metering valve 44）, the bottom of interior conduit 41 is upper with vehicle vent gas discharging pipe road 61
Trip communicates, and the downstream in vehicle vent gas discharging pipe road 61 communicates with SCR postprocessor 6, and the outer cup of interior conduit 41 is provided with outer shroud
42, into there is nozzle chamber 43, the nozzle chamber 43 communicates folder with one end of nozzle cooling tube 7 between interior conduit 41, outer shroud 42,
The other end of nozzle cooling tube 7 communicates with compressed air source 3.The compressed air source 3 is preferably air storage tank or air pressure
Contracting machine, the outlet pressure of air compressor is more preferably 0.8-1.2Mpa.
A kind of application method of the urea injection system of above-mentioned tyre urea nozzle air cooling branch road, the application method
Comprise the following steps successively：
Gas injection step：Pre- note operation is first carried out to urea measuring pump 1, in pre- note operation latter stage, is opened in urea measuring pump 1
Compressed air channel, and cooling air magnetic valve 71 is opened, to cool down urea nozzle 4 in the lump；
Urea injecting step：When reaching urea injection conditions, control urea measuring pump 1 is pumped into urea liquid to urea nozzle 4
21, now, cooling air magnetic valve 71 maintains opening state with the compressed air channel in urea measuring pump 1；
Terminate injecting step：When engine is shut down, first urea measuring pump 1 is controlled to stop being pumped into urea liquid to urea nozzle 4
21, turn off cooling air magnetic valve 71 and the compressed air channel in urea measuring pump 1.
Embodiment 2：
With embodiment 1, difference is substance：
The outer shroud 42, the bottom of interior conduit 41 are respectively positioned on the inside in vehicle vent gas discharging pipe road 61.The outer shroud 42 wraps
Cylindrical portion 421 and conus portion 422 are included, the larger diameter end of the conus portion 422 communicates with the bottom of cylindrical portion 421, conus portion 422
Smaller diameter end communicated with the inside in vehicle vent gas discharging pipe road 61, and nozzle cooling tube 7 pass after the outer wall of cylindrical portion 421 with
Nozzle chamber 43 communicates.
Embodiment 3：
With embodiment 1, difference is substance：
The urea injection system also includes control unit 8, urea temperature sensor 22, urea liquid level sensor 23 and SCR temperature
Sensor 62 is spent, the urea liquid level sensor 23 is located in urea tank 2 on the liquid level line of urea liquid 21, the urea temperature
Degree sensor 22 is located at the inside of urea liquid 21 in urea tank 2, and the SCR temperature sensor 62 is arranged at SCR postprocessor 6
On, the urea tank 2 is communicated by pipette 24, liquid back pipe 25 with urea measuring pump 1, the friendship of pipette 24, urea measuring pump 1
Place is met higher than liquid back pipe 25, the junction of urea measuring pump 1, pipette 24, the junction of urea tank 2 are higher than liquid back pipe 25, urine
The junction of plain tank 2, and the position in pipette 24 in urea tank 2 is extended in urea liquid 21；The urea temperature
Sensor 22, urea liquid level sensor 23, SCR temperature sensor 62 are connected with the signal input part of control unit 8, and control is single
The signal output part of member 8 is connected with urea measuring pump 1, the signal of cooling air magnetic valve 71.
Embodiment 4：
With embodiment 1, difference is substance：
Air electric valve is provided with the urea measuring pump 1；Compressed air channel in the urea measuring pump 1 open with
It is no, by being controlled realization to air electric valve.
Embodiment 5：
With embodiment 1, difference is substance：
System preparation step is additionally provided with before the gas injection step, the system preparation step refers to：Start vehicle electrical
During source, control system carries out self-test to urea injection system.
Claims (10)
1. a kind of urea injection system of tyre urea nozzle air cooling branch road, including urea measuring pump（1）, urea tank（2）、
Compressed air source（3）With urea nozzle（4）, the urea tank（2）, compressed air source（3）With urea measuring pump（1）Input
Communicate, urea measuring pump（1）Output end through playpipe（5）Afterwards with urea nozzle（4）One end communicate, urea nozzle（4）'s
The other end and vehicle vent gas discharging pipe road（61）Communicate, it is characterised in that：
The urea injection system also includes nozzle cooling tube（7）And the cooling air magnetic valve set thereon（71）, the urine
Plain nozzle（4）Including interior conduit（41）With outer shroud（42）, said inner tube road（41）Top and playpipe（5）Communicate, inner tube
Road（41）Bottom and vehicle vent gas discharging pipe road（61）Upstream communicate, vehicle vent gas discharging pipe road（61）Downstream and SCR
Preprocessor（6）Communicate, interior conduit（41）Outer cup be provided with outer shroud（42）, interior conduit（41）, outer shroud（42）Between press from both sides
Into there is nozzle chamber（43）, the nozzle chamber（43）With nozzle cooling tube（7）One end communicate, nozzle cooling tube（7）It is another
End and compressed air source（3）Communicate.
2. a kind of urea injection system of tyre urea nozzle air cooling branch road according to claim 1, its feature exist
In：The compressed air source（3）For air storage tank or air compressor.
3. a kind of urea injection system of tyre urea nozzle air cooling branch road according to claim 2, its feature exist
In：The outlet pressure of the air compressor is 0.8-1.2Mpa.
4. a kind of urea injection system of tyre urea nozzle air cooling branch road according to claim 1,2 or 3, it is special
Sign is：The outer shroud（42）, interior conduit（41）Bottom be respectively positioned on vehicle vent gas discharging pipe road（61）Inside.
5. a kind of urea injection system of tyre urea nozzle air cooling branch road according to claim 1,2 or 3, it is special
Sign is：The outer shroud（42）Including cylindrical portion（421）With conus portion（422）, the conus portion（422）Larger diameter end with
Cylindrical portion（421）Bottom communicate, conus portion（422）Smaller diameter end and vehicle vent gas discharging pipe road（61）Inside communicate,
And nozzle cooling tube（7）Pass cylindrical portion（421）Outer wall after with nozzle chamber（43）Communicate.
6. a kind of urea injection system of tyre urea nozzle air cooling branch road according to claim 1,2 or 3, it is special
Sign is：
The urea injection system also includes control unit（8）, urea temperature sensor（22）, urea liquid level sensor（23）With
SCR temperature sensor（62）, the urea liquid level sensor（23）Positioned at urea tank（2）Middle urea liquid（21）Liquid level line it
On, the urea temperature sensor（22）Positioned at urea tank（2）Middle urea liquid（21）Inside, the SCR temperature sensor
（62）It is arranged at SCR postprocessor（6）On；The urea tank（2）Pass through pipette（24）, liquid back pipe（25）With urea measuring pump
（1）Communicate, pipette（24）, urea measuring pump（1）Junction be higher than liquid back pipe（25）, urea measuring pump（1）Junction,
Pipette（24）, urea tank（2）Junction be higher than liquid back pipe（25）, urea tank（2）Junction, and pipette（24）Middle position
In urea tank（2）Interior position extends to urea liquid（21）It is interior；
The urea temperature sensor（22）, urea liquid level sensor（23）, SCR temperature sensor（62）With control unit（8）
Signal input part be connected, control unit（8）Signal output part and urea measuring pump（1）, cooling air magnetic valve（71）
Signal connects.
7. a kind of urea injection system of tyre urea nozzle air cooling branch road according to claim 1,2 or 3, it is special
Sign is：Said inner tube road（41）Top pass through metering valve（44）Afterwards with playpipe（5）Bottom communicate.
8. a kind of application method of the urea injection system of the tyre urea nozzle air cooling branch road described in claim 1, its
It is characterised by that the application method comprises the following steps successively：
Gas injection step：First to urea measuring pump（1）Pre- note operation is carried out, in pre- note operation latter stage, opens urea measuring pump（1）
Interior compressed air channel, and open cooling air magnetic valve（71）, to cool down urea nozzle in the lump（4）；
Urea injecting step：When reaching urea injection conditions, urea measuring pump is controlled（1）To urea nozzle（4）It is pumped into urea
Solution（21）, now, cooling air magnetic valve（71）With urea measuring pump（1）Interior compressed air channel maintains to open shape
State；
Terminate injecting step：When engine is shut down, urea measuring pump is first controlled（1）Stop to urea nozzle（4）It is pumped into urea
Solution（21）, turn off cooling air magnetic valve（71）With urea measuring pump（1）Interior compressed air channel.
A kind of 9. user of the urea injection system of tyre urea nozzle air cooling branch road according to claim 8
Method, it is characterised in that：The urea measuring pump（1）Inside it is provided with air electric valve；The urea measuring pump（1）Interior compression is empty
Whether gas passage is opened, by being controlled realization to air electric valve.
A kind of 10. user of the urea injection system of tyre urea nozzle air cooling branch road according to claim 8
Method, it is characterised in that：System preparation step is additionally provided with before the gas injection step, the system preparation step refers to：
When starting vehicle power supply, control system carries out self-test to urea injection system.
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| CN201710297109.XA CN107420164B (en) | 2017-04-28 | 2017-04-28 | Urea injection system with external urea nozzle air cooling branch and use method |
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| CN201710297109.XA CN107420164B (en) | 2017-04-28 | 2017-04-28 | Urea injection system with external urea nozzle air cooling branch and use method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109184861A (en) * | 2018-09-03 | 2019-01-11 | 江苏海事职业技术学院 | Naval vessels kinetic spray system |
| CN112282917A (en) * | 2020-09-25 | 2021-01-29 | 潍柴动力股份有限公司 | Engine thermal management system and vehicle |
| CN113565605A (en) * | 2021-09-24 | 2021-10-29 | 寿光市博达机械制造有限公司 | Urea nozzle capable of preventing crystallization and frost cracking |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100319322A1 (en) * | 2008-03-12 | 2010-12-23 | Huethwohl Georg | Metering system for injecting a urea solution into the exhaust gas flow of an internal combustion engine |
| CN101984228A (en) * | 2010-10-21 | 2011-03-09 | 中国第一汽车集团公司 | Mechanical pump type SCR urea spraying system |
| CN102691553A (en) * | 2012-06-13 | 2012-09-26 | 安徽艾可蓝节能环保科技有限公司 | Air-assisting type SCR (Selective Catalyst Reaction) system |
| CN102840014A (en) * | 2011-06-20 | 2012-12-26 | 杭州银轮科技有限公司 | Air-assisted injection system for diesel engine urea after-treatment SCR (Selective Catalytic Reduction) system |
| CN103670612A (en) * | 2013-12-20 | 2014-03-26 | 无锡市凯龙汽车设备制造有限公司 | Urea solution supplying device of integration automobile SCR post-processing system |
| CN105986861A (en) * | 2015-02-10 | 2016-10-05 | 安徽艾可蓝节能环保科技有限公司 | SCR tail gas treatment system for engine |
| CN106150612A (en) * | 2016-07-04 | 2016-11-23 | 武汉理工大学 | Gas jet type adds blue combined jet device and application thereof |
| CN206801659U (en) * | 2017-04-28 | 2017-12-26 | 东风商用车有限公司 | Urea injection system with external urea nozzle air cooling branch |
-
2017
- 2017-04-28 CN CN201710297109.XA patent/CN107420164B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100319322A1 (en) * | 2008-03-12 | 2010-12-23 | Huethwohl Georg | Metering system for injecting a urea solution into the exhaust gas flow of an internal combustion engine |
| CN101984228A (en) * | 2010-10-21 | 2011-03-09 | 中国第一汽车集团公司 | Mechanical pump type SCR urea spraying system |
| CN102840014A (en) * | 2011-06-20 | 2012-12-26 | 杭州银轮科技有限公司 | Air-assisted injection system for diesel engine urea after-treatment SCR (Selective Catalytic Reduction) system |
| CN102691553A (en) * | 2012-06-13 | 2012-09-26 | 安徽艾可蓝节能环保科技有限公司 | Air-assisting type SCR (Selective Catalyst Reaction) system |
| CN103670612A (en) * | 2013-12-20 | 2014-03-26 | 无锡市凯龙汽车设备制造有限公司 | Urea solution supplying device of integration automobile SCR post-processing system |
| CN105986861A (en) * | 2015-02-10 | 2016-10-05 | 安徽艾可蓝节能环保科技有限公司 | SCR tail gas treatment system for engine |
| CN106150612A (en) * | 2016-07-04 | 2016-11-23 | 武汉理工大学 | Gas jet type adds blue combined jet device and application thereof |
| CN206801659U (en) * | 2017-04-28 | 2017-12-26 | 东风商用车有限公司 | Urea injection system with external urea nozzle air cooling branch |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109184861A (en) * | 2018-09-03 | 2019-01-11 | 江苏海事职业技术学院 | Naval vessels kinetic spray system |
| CN112282917A (en) * | 2020-09-25 | 2021-01-29 | 潍柴动力股份有限公司 | Engine thermal management system and vehicle |
| CN113565605A (en) * | 2021-09-24 | 2021-10-29 | 寿光市博达机械制造有限公司 | Urea nozzle capable of preventing crystallization and frost cracking |
| CN113565605B (en) * | 2021-09-24 | 2021-12-17 | 寿光市博达机械制造有限公司 | Urea nozzle capable of preventing crystallization and frost cracking |
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|---|---|
| CN107420164B (en) | 2023-10-10 |
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