CN105833751A - Vehicle-mounted intelligent urea solution manufacturing device and operating method thereof - Google Patents
Vehicle-mounted intelligent urea solution manufacturing device and operating method thereof Download PDFInfo
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- CN105833751A CN105833751A CN201610333884.1A CN201610333884A CN105833751A CN 105833751 A CN105833751 A CN 105833751A CN 201610333884 A CN201610333884 A CN 201610333884A CN 105833751 A CN105833751 A CN 105833751A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F21/00—Dissolving
- B01F21/02—Methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F21/00—Dissolving
- B01F21/10—Dissolving using driven stirrers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F21/00—Dissolving
- B01F21/30—Workflow diagrams or layout of plants, e.g. flow charts; Details of workflow diagrams or layout of plants, e.g. controlling means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/70—Pre-treatment of the materials to be mixed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/88—Forming a predetermined ratio of the substances to be mixed by feeding the materials batchwise
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F35/93—Heating or cooling systems arranged inside the receptacle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F2035/99—Heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/48—Mixing water in water-taps with other ingredients, e.g. air, detergents or disinfectants
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a vehicle-mounted intelligent urea solution manufacturing device. The manufacturing device comprises a vehicle-mounted water purifying device, a urea box and a urea solution generating box, wherein the vehicle-mounted water purifying device purifies water into purified water and conveys the purified water into the urea solution generating box through a water pump and a metering valve; the urea box is used for storing urea crystals and conveying the urea crystals to the urea solution generating box through a urea metering device; a stirrer and a heater are arranged in the urea solution generating box, and are used for generating urea solution; a urea solution outlet is formed in the bottom of the urea solution generating box, which provides urea solution for an SCR system. The device automatically generates urea solution, and realizes the preparation of urea solution during use and the detection of urea solution standard. The device reduces transportation cost and an AdBlue manufacturing link, solves network construction of supporting urea infrastructure construction facilities, and reduces the vehicle utilization cost; besides, the SCR system is washed through the purified water in the system, so that the normal operation of the SCR system is ensured, and the service life is prolonged.
Description
Technical field
The invention belongs to diesel locomotive tail gas disposal technique field, particularly relate to a kind of car dress intelligence aqueous solution of urea system
Manufacturing apparatus and method of work thereof.
Background technology
In order to carry out " The Law of the People's Republic of China on the Prevention and Control of Atmospheric Pollution ", strictly control automobile pollution.Present stage
State four implemented by motor-car, present stage technology path SCR(catalytic reaction also original system discharges in state five) it is main flow.
Urea for vehicle is that heavy-duty diesel vehicle reaches state four and the essential product of above discharge standard.Urea for vehicle refers to carbamide
The AdBlue(urea for vehicle aqueous solution that concentration is 32.5% and solvent is ultra-pure water), raw material is urea for vehicle special raw material and surpasses
Pure water.The diesel vehicle such as heavy truck, passenger vehicle state to be reached more than four discharge standard, will select applicable in vent gas treatment
SCR system, and this system must utilize urea liquid to process the nitrogen oxides in tail gas.
For SCR technology route, it is water-soluble that crucial problem is to need to solve AdBlue(urea for vehicle in China
Liquid) production and supply and gas station supporting carbamide filling infrastructure network set up.Government's management to SCR vehicle simultaneously,
The formulation of planning and corresponding regulation is also by determining the SCR route vitality in China, otherwise, if SCR automobile is not having
AdBlue(urea for vehicle aqueous solution) in the case of continue travel, its real exhaust emissions will more be harmful to environment.Therefore,
AdBlue(urea for vehicle solution) become heavy truck and passenger vehicle to reach state four and the essential product of above discharge standard.
Along with comprehensive implementation of state of China four standard, SCR(SCR) exhaust aftertreatment technology becomes applicable
The large diesel engine energy-conserving and emission-cutting technology route of China's national situation, urea for vehicle solution is the most increasingly subject to weight as SCR reducing agent
Depending on, urea for vehicle market presents very good prospect, and naturally a lot of people think therefrom to have a share, various harmful competitions
The most gradually reveal the symptom of a trend.In order to ensure the quality of urea for vehicle, Concentration Testing becomes an important finger of urea for vehicle quality testing
Mark.The how urea for vehicle solution supplier of looking for qualified and quickly detect these two difficult problems, has just become domestic automobile producer anxious
Need to solve in a short time.The concentration of urea liquid is one of key factor in SCR also original system, current including of detection method
Learning reagent titrimetry, Kjeldahl's method, refractometry etc., near-infrared method OSA4 CoolCheck detection speed is fast, economical
Material benefit, it is urea for vehicle content method most economical, economical, effective, can be widely used for laboratory and on-the-spot urea for vehicle solution
Detection.
Summary of the invention
Present invention aim at providing for the defect of prior art a kind of direct minimizing car owner's to use car cost, prevent
The car dress intelligence aqueous solution of urea of SCR system crystallization manufactures device and method of work thereof.
The present invention for achieving the above object, adopts the following technical scheme that
A kind of car dress intelligence aqueous solution of urea manufactures device, it is characterised in that: it includes vehicle-mounted water purifier, urea box, carbamide
Aqueous solution generates case;It is pure water that described vehicle-mounted water purifier is used for the Water warfare in vehicle-mounted water tank, and by water pump and meter
Amount valve is delivered to aqueous solution of urea and generates case;Described urea box is used for storing urea crystal, is delivered to by carbamide metering device
Aqueous solution of urea generates case;Described aqueous solution of urea is provided with blender and heater in generating case, for by pure water and urine
Cellulose crystal mixed dissolution generates aqueous solution of urea, and described aqueous solution of urea generates bottom portion and has aqueous solution of urea outlet, to SCR
System is supplied urea aqueous solution.
It is provided with pure water purity detecting instrument in being further characterized by described vehicle-mounted water purifier, be used for detecting pure
Clean resistivity of water;Described aqueous solution of urea is provided with urea liquid fast detector in generating case, is used for detecting urea liquid
Concentration;Described aqueous solution of urea is provided with liquid level sensor in generating case, is used for detecting aqueous solution of urea and generates liquid level in case.
Further: described carbamide metering device is screw metering system.
Described urea liquid fast detector is that near infrared spectrum detects equipment.
Described vehicle-mounted water purifier outlet is provided with drinking water outlet and SCR system washes out the mouth of a river;Described SCR system
System is washed out the mouth of a river and is controlled by electromagnetic valve.
A kind of above-mentioned car dress intelligence aqueous solution of urea manufactures the method for work of device, it is characterised in that include that carbamide is water-soluble
Liquid manufactures work process and SCR system cleaning process;
Described aqueous solution of urea manufactures work process and comprises the steps:
(1) water in vehicle-mounted water tank is purified by vehicle-mounted water purifier, reaches >=15M Ω through the detection of pure water purity detecting instrument
After cm2/25 DEG C, pump working, generate case by metering valve to aqueous solution of urea and inject pure water;Meanwhile, carbamide metering device
Urea crystal in urea box is put into aqueous solution of urea and generates case;
(2) heater in aqueous solution of urea generates case begins to warm up, and blender starts stirring and dissolving urea crystal simultaneously, described
Urea liquid fast detector detects concentration of aqueous solution of urea in real time, and supplement in real time according to concentration of aqueous solution of urea pure water or
Urea crystal, makes concentration of aqueous solution of urea reach 32.5% ± 1.5%;
Described SCR system cleaning process is: after electromotor GES stops the setting time, and SCR system cleans water outlet
Mouthful electromagnetic valve open, the pure water in vehicle-mounted water purifier is passed through SCR system pipeline by water pump, to SCR system pipeline and
Nozzle is carried out, and prevents SCR system pipeline and nozzle urea crystals.
Preferred: the described SCR system cleaning process startup time is after electromotor GES stops 2 minutes or people
Work is opened.
The present invention solves AdBlue(urea for vehicle solution) network imperfection Construction Problems, it has only in the present invention
Car dress intelligence carbamide generator add industrial high-purity carbamide particulate solid and tap water, after being processed by this device, reach
AdBlue(automobile urea liquid) standard.The present invention has an advantage that
1, decrease cost of transportation and AdBlue manufactures link, solve supporting carbamide capital construction facility networking.
AdBlue(automobile urea liquid) it is with (without the height of other any additives) technical pure carbamide and (tap water after treatment)
The solution that pure water is prepared together, in this solution, urea content is 32.5%(mass fraction).Jointly make at AdBlue and SCR technology
Under with, engine performance and fuel consumption can be optimized, reduce diesel consumption and may be up to 6%, significantly reduce cost.AdBlue's is flat
All consumptions are the 5% of general diesel-fuel consumptions, are about normal (highway is driven) and travel every 100 kilometers of consumption 2 liters (every kilometer
0.09 yuan).That directly reduces car owner uses car cost.Filling intelligence carbamide liquid generator by the car of the present invention, every kilometer of carbamide disappears
Consumption is without departing from 2 points of.
2, very sensitive to ambient temperature because of the dissolubility of urea liquid, current this directly produce from urea solution
Normal fluid directly affects the component content of filling urea solution in storage and transport process.
3, after existing SCR system applies this car dress intelligence aqueous solution of urea manufacture machine, increase the service life and guarantee work
Make reliability, because AdBlue is when temperature is less than 30 degree, crystallize out solids, can block system interior conduit and urea nozzle.As
The most enforceable work, can damage SCR system.After the SCR system adapted present invention, it is possible to use the pure water pair in native system
SCR system is rinsed, it is ensured that SCR system working properly, improves service life.
4, drink direct drinking water is provided to passengers inside the car.
Accompanying drawing explanation
Fig. 1 is present system structural representation.
Detailed description of the invention
A kind of car dress intelligence aqueous solution of urea manufactures device as shown in Figure 1, it include vehicle-mounted water purifier 1, urea box 2,
Aqueous solution of urea generates case 3;Described vehicle-mounted water purifier 1 is used for the Water warfare in vehicle-mounted water tank being pure water, and passes through water
Pump 4 and metering valve 5 are delivered to aqueous solution of urea and generate case 3;Described urea box 2 is used for storing urea crystal, is measured by screw rod
Device 6 is delivered to aqueous solution of urea and generates case 3;Described aqueous solution of urea is provided with blender 8 and heater 7 in generating case 3, uses
In pure water and urea crystal mixed dissolution are generated aqueous solution of urea, described aqueous solution of urea generates has carbamide bottom case 3
Aqueous solution outlet 15, supplies urea aqueous solution to SCR system.
It is provided with pure water purity detecting instrument 9 in described vehicle-mounted water purifier 1, is used for detecting pure resistivity of water;Institute
State in aqueous solution of urea generates case 3 and be provided with near infrared spectrum detection equipment 12, for detecting the concentration of urea liquid;Described urine
Element aqueous solution is provided with liquid level sensor 10 in generating case 3, is used for detecting aqueous solution of urea and generates liquid level in case 3.
Described vehicle-mounted water purifier 1 outlet is provided with drinking water outlet 13 and SCR system washes out the mouth of a river 14;Described
SCR system is washed out the mouth of a river 14 and is controlled by electromagnetic valve 11.
A kind of above-mentioned car dress intelligence aqueous solution of urea manufactures the method for work of device, including aqueous solution of urea manufacture work
Process and SCR system cleaning process.
(1) water in vehicle-mounted water tank is purified by vehicle-mounted water purifier 1.Reach through the detection of pure water purity detecting instrument 9
After >=15M Ω cm2/25 DEG C, water pump 4 works, and generates case 3 by metering valve 5 to aqueous solution of urea and injects pure water;Meanwhile, spiral shell
Urea crystal in urea box 2 is put into aqueous solution of urea and generates case 3 by bar metering device 6.When pure water purity is not up to standard
Value, then process again to pure water, until up to standard, if again process 3 times the most up to standard, then 9, pure water purity detecting instrument
Go out alarm signal.
(2) heater 7 in aqueous solution of urea generates case 3 begins to warm up, and blender 8 starts stirring and dissolving carbamide crystalline substance simultaneously
Body, described urea liquid fast detector 12 detects concentration of aqueous solution of urea in real time, and mends in real time according to concentration of aqueous solution of urea
Fill pure water or urea crystal, make concentration of aqueous solution of urea reach 32.5% ± 1.5%.By liquid level sensor 10, carbamide is water-soluble
In liquid generates case 3, liquid level is less than the 1/3 of total liquid level, and water pump 4 is started working.When liquid level sensor 10 detects that water level is close to full position
Time water pump 4 quit work.According to the concentration of aqueous solution of urea of near infrared spectrum detection equipment 12 detection, by water purification metering valve 5
With screw metering system 6 forked working, concentration of aqueous solution of urea is made to reach 32.5% ± 1.5% proportioning.
Described SCR system cleaning process is: after electromotor GES stops the setting time, and SCR system is cleaned
The electromagnetic valve 11 of outlet 14 is opened, and the pure water in vehicle-mounted water purifier 1 is passed through SCR system pipeline, to SCR by water pump 4
System pipeline and nozzle are carried out, and prevent SCR system pipeline and nozzle urea crystals.Washing time is at most up to 30 minutes.
Preferred: the described SCR system cleaning process startup time is after electromotor GES stops 2 minutes or people
Work is opened.
Claims (7)
1. a car dress intelligence aqueous solution of urea manufactures device, it is characterised in that: it includes vehicle-mounted water purifier, urea box, urine
Element aqueous solution generates case;Described vehicle-mounted water purifier for being pure water by the Water warfare in vehicle-mounted water tank, and by water pump and
Metering valve is delivered to aqueous solution of urea and generates case;Described urea box is used for storing urea crystal, is carried by carbamide metering device
Case is generated to aqueous solution of urea;Described aqueous solution of urea generates in case and is provided with blender and heater, for by pure water and
Urea crystal mixed dissolution generates aqueous solution of urea, and described aqueous solution of urea generates bottom portion and has aqueous solution of urea outlet, gives
SCR system is supplied urea aqueous solution.
Car the most according to claim 1 dress intelligence aqueous solution of urea manufactures device, it is characterised in that: described vehicle-mounted water purification cartridge
It is provided with pure water purity detecting instrument in putting, is used for detecting pure resistivity of water;Described aqueous solution of urea is arranged in generating case
There is urea liquid fast detector, for detecting the concentration of urea liquid;Described aqueous solution of urea is provided with liquid level in generating case
Sensor, is used for detecting aqueous solution of urea and generates liquid level in case.
Car the most according to claim 1 and 2 dress intelligence aqueous solution of urea manufactures device, it is characterised in that: described nreameter
Amount device is screw metering system.
Car the most according to claim 1 and 2 dress intelligence aqueous solution of urea manufactures device, it is characterised in that: described carbamide is molten
Liquid fast detector is near infrared spectrum detection or folding light sensing device.
Car the most according to claim 1 and 2 dress intelligence aqueous solution of urea manufacture device, it is characterised in that: described vehicle-mounted only
Water device outlet is provided with drinking water outlet and SCR system washes out the mouth of a river;Described SCR system washes out the mouth of a river by electricity
Magnet valve controls.
6. the car dress intelligence aqueous solution of urea described in any one of claim 1-5 manufactures a method of work for device, its feature
It is to include that aqueous solution of urea manufactures work process and SCR system cleaning process;
Described aqueous solution of urea manufactures work process and comprises the steps:
(1) water in vehicle-mounted water tank is purified by vehicle-mounted water purifier, reaches >=15M Ω through the detection of pure water purity detecting instrument
cm2After/25 DEG C, pump working, generate case by metering valve to aqueous solution of urea and inject pure water;Meanwhile, carbamide metering device
Urea crystal in urea box is put into aqueous solution of urea and generates case;
(2) heater in aqueous solution of urea generates case begins to warm up, and blender starts stirring and dissolving urea crystal simultaneously, described
Urea liquid fast detector detects concentration of aqueous solution of urea in real time, and supplement in real time according to concentration of aqueous solution of urea pure water or
Urea crystal, makes concentration of aqueous solution of urea reach 32.5% ± 1.5%;
Described SCR system cleaning process is: after electromotor GES stops the setting time, and SCR system cleans water outlet
Mouthful electromagnetic valve open, the pure water in vehicle-mounted water purifier is passed through SCR system pipeline by water pump, to SCR system pipeline and
Nozzle is carried out, and prevents SCR system pipeline and nozzle urea crystals.
Car the most according to claim 6 dress intelligence aqueous solution of urea manufactures the method for work of device, it is characterised in that: described
The SCR system cleaning process startup time is after electromotor GES stops 2 minutes or manually to open.
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Cited By (8)
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CN106582337A (en) * | 2016-12-21 | 2017-04-26 | 成都乾威科技有限公司 | Pure water heating and injecting method for diesel exhaust fluid production |
CN106621740A (en) * | 2017-03-15 | 2017-05-10 | 上海龙净环保科技工程有限公司 | Catalytic hydrolysis ammonia producing system and method by using urea with waste heat |
CN107670517A (en) * | 2017-10-14 | 2018-02-09 | 佛山海格利德机器人智能设备有限公司 | A kind of car fills intelligent aqueous solution of urea manufacture device |
CN108355531A (en) * | 2018-03-16 | 2018-08-03 | 溢通环保科技(莆田)有限公司 | A kind of urea for vehicle solution-preparation device |
CN108479490A (en) * | 2018-03-16 | 2018-09-04 | 溢通环保科技(莆田)有限公司 | A kind of urea for vehicle solution production control method |
CN109289688A (en) * | 2018-09-17 | 2019-02-01 | 淮北惠源环保科技有限公司 | A kind of urea for vehicle solution concentration adjustable apparatus |
CN110094247A (en) * | 2018-01-31 | 2019-08-06 | 万国引擎知识产权有限责任公司 | The NOx of engine discharge is reduced using the DEF of enhancing |
CN112371053A (en) * | 2020-09-07 | 2021-02-19 | 襄阳达安汽车检测中心有限公司 | Full-automatic urea proportioning adding and recycling device for engine test |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN106582337A (en) * | 2016-12-21 | 2017-04-26 | 成都乾威科技有限公司 | Pure water heating and injecting method for diesel exhaust fluid production |
CN106621740A (en) * | 2017-03-15 | 2017-05-10 | 上海龙净环保科技工程有限公司 | Catalytic hydrolysis ammonia producing system and method by using urea with waste heat |
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CN108479490B (en) * | 2018-03-16 | 2020-07-28 | 溢通环保科技(莆田)有限公司 | Production control method of urea solution for vehicles |
CN109289688A (en) * | 2018-09-17 | 2019-02-01 | 淮北惠源环保科技有限公司 | A kind of urea for vehicle solution concentration adjustable apparatus |
CN112371053A (en) * | 2020-09-07 | 2021-02-19 | 襄阳达安汽车检测中心有限公司 | Full-automatic urea proportioning adding and recycling device for engine test |
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