CN206016916U - A kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment - Google Patents
A kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment Download PDFInfo
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- CN206016916U CN206016916U CN201620932741.8U CN201620932741U CN206016916U CN 206016916 U CN206016916 U CN 206016916U CN 201620932741 U CN201620932741 U CN 201620932741U CN 206016916 U CN206016916 U CN 206016916U
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- ammonia
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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
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Abstract
The utility model discloses a kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment, including ammonia tank, liquid level and temperature sensor, electrically heated rod, ammonia pressure reducer, vacuum tank, pressure-temperature sensor, automatically controlled ammonia metering valve, mechanical ammonia nozzle, controller；Ammonia tank is fixed on car load vehicle frame, liquid level and temperature sensor and electrically heated rod are integrated in ammonia tank, ammonia tank connects ammonia pressure reducer by pipeline, ammonia pressure reducer connects vacuum tank by pipeline, pressure-temperature sensor is integrated on vacuum tank, vacuum tank pipeline connects automatically controlled ammonia metering valve, automatically controlled ammonia metering valve is provided separately with mechanical ammonia nozzle, mechanical ammonia nozzle is directly installed on blast pipe, automatically controlled ammonia metering valve pipeline connecting machine tool ammonia nozzle, controller respectively with liquid level and temperature sensor, electrically heated rod, pressure-temperature sensor and the electrical connection of automatically controlled ammonia metering valve.
Description
Technical field
The utility model belongs to diesel engine for automobile exhaust after treatment system, and liquefied ammonia is used as diesel engine nitrogen oxides (NOx)
Reducing agent, more particularly to a kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment.
Background technology
With the enforcement of IV Abgasgesetz of commercial car state, car load must install nitrogen oxides (NOx) exhaust aftertreatment devices additional.
Chinese medium and heavy-duty engines generally adopt SCR (SCR) technology path, will standard urea for vehicle
The aqueous solution is ejected in exhaust, decomposes the ammonia (NH for producing using which3) SCR is carried out to NOx, generate harmless
Nitrogen (N2) and water (H2O).
Urea solution has obvious shortcoming as reducing agent：Freezed in winter, needs the heating defrosting ability of more than half an hour
Enough normal works；Poor performance at low temperatures, needs higher delivery temperature just be fully converted into NH3, in the relatively low city of delivery temperature
When running under city's operating mode, need in the additional insulation material of blast pipe, install burner additional to improve temperature before catalyst converter, it is ensured that urea
Fully convert, otherwise easily generate mass crystallization, cause gas exhaust piping to block, affect vehicle operation；Urea production process high energy
Consumption high pollution, the proportioning urea for vehicle aqueous solution need pure water, pure water production process to need to expend 3 times of light waters.
Content of the invention
In order to overcome the disadvantages mentioned above of prior art, the utility model provides a kind of for diesel engine for automobile vent gas treatment
Automatically controlled nozzle-type ammonia spraying system, winter do not freeze, through simple heating even heating can work, in hgher efficiency；
Direct reaction after ejection, it is not necessary to hydrolyze, insensitive to delivery temperature；Ammonia is the raw material for producing urea, and injection need not
Water, can save significantly on the energy and resource.
The purpose of this utility model is realized by below scheme：
The utility model provides a kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment, including
Ammonia tank, liquid level and temperature sensor, electrically heated rod, ammonia pressure reducer, vacuum tank, pressure-temperature sensor, the metering of automatically controlled ammonia
Valve, mechanical ammonia nozzle, controller；The ammonia tank is fixed on car load vehicle frame, and storage liquefied ammonia in ammonia tank, liquid level temperature are passed
Sensor and electrically heated rod are integrated in ammonia tank, and ammonia tank connects ammonia pressure reducer by pipeline, and ammonia pressure reducer passes through pipeline
Connection vacuum tank, vacuum tank are fixed on car load vehicle frame, and pressure-temperature sensor is integrated on vacuum tank, and vacuum tank pipeline connects
Automatically controlled ammonia metering valve, automatically controlled ammonia metering valve are provided separately with mechanical ammonia nozzle, and mechanical ammonia nozzle is directly installed on row
On tracheae, automatically controlled ammonia metering valve pipeline connecting machine tool ammonia nozzle, controller respectively with liquid level and temperature sensor, electrical heating
The electrical connection of rod, pressure-temperature sensor and automatically controlled ammonia metering valve.Injection pressure is provided by liquefied ammonia saturated vapor pressure, ammonia is through subtracting
Ammonia metering valve is reached after depressor, vacuum tank, ammonia pipeline, and pressure-temperature sensor is integrated on vacuum tank, and ECU combines pressure
The signals such as power, temperature control ammonia metering valve carries out injection metering, and mechanical ammonia nozzle is directly installed on blast pipe.Metering valve
Without being arranged on blast pipe, the heat resistance of metering valve is required to substantially reduce, system cost is relatively low.
Further, the ammonia tank is externally provided with thermal insulation layer.
Further, the ammonia tank is provided with 5%～15% residual volume V1；The ammonia pressure reducer Pressure reducing ratio k models
Enclose for 1:5～1:3, after the decompression of ammonia pressure reducer, ammonia pressure is 1～4bar；Voltage stabilizing tank volume V2, ammonia tank are remaining to be held
Following relation is met between product V1, ammonia pressure reducer Pressure reducing ratio k, liquefied ammonia injection volume V3 per second：
(V2/k+V1)/V3≤1%
The utility model provides a kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment simultaneously
Control method, including procedure below：Controller works as liquefied ammonia by liquid level and temperature sensor monitor in real time ammonia tank internal temperature
Tank internal temperature less than default maintenance temperature when, electrically heated rod heating ammonia tank in liquefied ammonia be allowed to temperature raise reach maintenance temperature
Degree, ammonia tank internal temperature is raised causes pressure to increase, and the gaseous state ammonia after pressurization is transported to after the decompression of ammonia pressure reducer
In vacuum tank, controller according to the pressure-temperature sensor feedback information on vacuum tank and combines engine running condition to electricity
Control ammonia metering valve sends injection pulse width and injection frequency signal, and ammonia is transported in mechanical ammonia nozzle 8 and the row of being ejected into
Reacted in tracheae.
Further, the automatically controlled ammonia nozzle injection is taken and determines frequency, controls the control of single injection event duty ratio of time
Mode；Write injection pressure and injection temperation penalty coefficient in controller, according to the temperature of ammonia, pressure value in ammonia tank,
In conjunction with the ammonia emitted dose needed for present engine condition calculating, control automatically controlled ammonia metering valve and open certain duration to meet
Emissions requirements.
Further, the injection frequency control of the automatically controlled ammonia metering valve is adjusted according to liquid level in ammonia tank and pressure flexible
Section.
Further, the injection frequency control of the automatically controlled ammonia metering valve is according to engine operating condition soft readjustment.
Further, the mechanical ammonia nozzle is preset with Opening pressure value, mechanical ammonia when less than Opening pressure value
Nozzle is not turned on.
Description of the drawings
Fig. 1 is schematic diagram of the present utility model.
Fig. 2 is control method flow chart of the present utility model.
In figure：
1- ammonia tank 2- liquid level and temperature sensor 3- electrically heated rod 4- ammonia pressure reducer 5- vacuum tank 6- pressure and temps
The automatically controlled ammonia metering valve 8- machineries ammonia nozzle 9- controllers of sensor 7-
Specific embodiment
Of the present utility model specific embodiment is described in detail below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment, including liquefied ammonia
Tank 1, liquid level and temperature sensor 2, electrically heated rod 3, ammonia pressure reducer 4, vacuum tank 5, pressure-temperature sensor 6, automatically controlled ammonia meter
Amount valve 7, mechanical ammonia nozzle 8, controller (ECU) 9.Wherein, ammonia tank 1 is fixed on car load vehicle frame, storing liquid in ammonia tank 1
Ammonia, liquid level and temperature sensor 2 and electrically heated rod 3 are integrated in ammonia tank 1, and ammonia tank 1 connects ammonia pressure reducer 4 by pipeline,
Ammonia pressure reducer 4 connects vacuum tank 5 by pipeline, and vacuum tank 5 is fixed on car load vehicle frame, and pressure-temperature sensor 6 is integrated in
On vacuum tank 5,5 pipeline of vacuum tank connects automatically controlled ammonia metering valve 7,7 pipeline connecting machine tool ammonia nozzle of automatically controlled ammonia metering valve
8, mechanical ammonia nozzle 8 is directly installed on blast pipe, controller 9 respectively with liquid level and temperature sensor 2, electrically heated rod 3, pressure
Temperature sensor 6 and automatically controlled ammonia metering valve 7 are electrically connected.The utility model is by automatically controlled ammonia metering valve 7 and mechanical ammonia nozzle 8
It is provided separately so that the automatically controlled ammonia metering valve 7 of non-refractory improves reliability and the life-span of system away from gas exhaust piping.
When ammonia spraying system works, electrically heated rod 3 is heated to the liquefied ammonia in ammonia tank 1, and liquefied ammonia heat is vaporized,
The saturated vapor pressure of 1 liquefied ammonia of ammonia tank produces pressure, and therefore ammonia tank 1 has storage ammonia and provides the work(of ammonia injection pressure
Energy.Design thermal insulation layer outside ammonia tank, it is to avoid winter tank interior temperature spend low cannot set up injection pressure, also avoid temperature in summer tank
Too high cause pressure inside the tank too high formed dangerous.
The residual volume V1 of the design of ammonia tank 1 5%～15%, to ensure to provide enough vapor state ammonias, liquid level temperature
Degree sensor 2 is used for the volume and temperature for monitoring and feeding back liquefied ammonia gas in ammonia tank 1.
The ammonia of the supply of ammonia tank 1 is transported to ammonia pressure reducer 4 through connecting line and is reduced pressure, and Pressure reducing ratio k is designed as
1:5～1:3, after pressure reducer 4 reduces pressure, ammonia pressure is 1～4bar, it is to avoid pipeline inner pressure is too high to cause danger, and relatively low
Injection pressure can be obviously improved nozzle simultaneously；
Vacuum tank 5 is a container with a constant volume, integrated temperature and pressure sensor 6 on vacuum tank 5；Vaporization
Ammonia enters vacuum tank 5 by pipeline after 4 pressure regulation of ammonia pressure reducer, and the pressure-temperature sensor 6 on vacuum tank 5 is measured
Ammonia temperature and pressure condition.
The ammonia injection pressure fluctuation of automatically controlled ammonia nozzle 7 should be less than 3%, be to realize this target, 5 volume of vacuum tank
There is following relation between V2,5 residual volume V1 of ammonia tank, Pressure reducing ratio k, liquefied ammonia injection volume V3 per second：
(V2/k+V1)/V3≤1%.
As shown in Fig. 2 the utility model provides a kind of automatically controlled nozzle-type ammonia spray for diesel engine for automobile vent gas treatment
Penetrate the control method of system：Controller passes through 2 monitor in real time ammonia tank of liquid level and temperature sensor, 1 internal temperature, when in ammonia tank 1
Portion's temperature less than default maintenance temperature when, electrically heated rod 3 heating ammonia tank 1 in liquefied ammonia be allowed to temperature raise reach maintenance temperature
Degree, 1 internal temperature of ammonia tank is raised causes pressure to increase, and the gaseous state ammonia after pressurization is conveyed after the decompression of ammonia pressure reducer 4
To in vacuum tank 5, controller 9 according to 6 feedback information of pressure-temperature sensor on vacuum tank 5 and combines engine operation shape
Condition sends the signal of injection pulse width and frequency to automatically controlled ammonia metering valve 7, ammonia is transported in mechanical ammonia nozzle 8 and is sprayed
Reacted in blast pipe.
In ammonia tank 1, temperature controls electrically heated rod 3-dimensional by controller 9 and holds between 10 DEG C～30 DEG C, suitable full to provide
And vapour pressure, different displacements engine ammonia emitted dose difference, the saturated vapor pressure of needs is that temperature is also different, and ECU is controlled not
Same maintenance temperature, with energy saving, improves response.During engine cold-start, if temperature is in 0～10 DEG C in ammonia tank 1, still
Controllable injection, now injection pressure is relatively low, writes injection pressure penalty coefficient in ECU, to ensure that emitted dose is substantially accurate；If
In ammonia tank 1, ammonia tank is heated to more than 10 DEG C less than 0 DEG C by temperature first, it is ensured that enough after injection pressure, just sprayed
Penetrate.
ECU9 is opened according to the automatically controlled ammonia metering valve 7 of operating conditions.Mechanical ammonia nozzle 8 is directly installed on blast pipe,
When automatically controlled ammonia metering valve 7 is opened, ammonia is entered in blast pipe by mechanical ammonia nozzle 8 through connecting line.Mechanical ammonia
The injection of nozzle 8 is taken and determines frequency, controls the control mode of single injection event duty ratio of time；Write injection pressure and injection in ECU
Temperature compensation coefficient, according to the temperature of ammonia, pressure value in vacuum tank 5, in conjunction with the ammonia needed for present engine condition calculating
Gas jet amount, controls automatically controlled ammonia metering valve 7 and opens certain duration to meet emissions requirements.
The control of 7 open frequency of metering valve can be adjusted according to liquid level in ammonia tank 1 and pressure flexible, when liquid level, pressure are suitable,
Using 1Hz frequencies, improve 7 life-span of metering valve while NOx conversion efficiency is ensured；When liquid level, pressure are low, 2Hz is taken
～10Hz frequencies are sprayed, and increase injection interval, liquefied ammonia is fully vaporized, to ensure enough injection pressures.
The control of 7 open frequency of metering valve can be according to engine operating condition soft readjustment, when engine is in the warm high load capacity of high row
Under operating mode, reduction reaction is easier to realize, using 1Hz frequencies, to improve 7 life-span of nozzle while NOx conversion efficiency is ensured；
When engine is under low row's temperature running on the lower load, using upper frequency 2Hz～10Hz, equal with the mixing of exhaust to ensure ammonia
Evenness, improves reaction efficiency, reduces ammonia and escapes.
Mechanical ammonia nozzle 8 designs certain Opening pressure value, and when less than Opening pressure value, mechanical ammonia nozzle 8 is not opened
Open, after vehicle stall, in pipeline, remaining ammonia will not be escaped in air, it is possible to reduce secondary environmental pollution.
Claims (3)
1. a kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment, it is characterised in that including liquefied ammonia
Tank, liquid level and temperature sensor, electrically heated rod, ammonia pressure reducer, vacuum tank, pressure-temperature sensor, automatically controlled ammonia metering valve, machine
Tool ammonia nozzle, controller；The ammonia tank is fixed on car load vehicle frame, storage liquefied ammonia, liquid level and temperature sensor in ammonia tank
It is integrated in ammonia tank with electrically heated rod, ammonia tank connects ammonia pressure reducer by pipeline, ammonia pressure reducer is connected by pipeline
Vacuum tank, vacuum tank are fixed on car load vehicle frame, and pressure-temperature sensor is integrated on vacuum tank, and the connection of vacuum tank pipeline is automatically controlled
Ammonia metering valve, automatically controlled ammonia metering valve are provided separately with mechanical ammonia nozzle, and mechanical ammonia nozzle is directly installed on blast pipe
On, automatically controlled ammonia metering valve pipeline connecting machine tool ammonia nozzle, controller respectively with liquid level and temperature sensor, electrically heated rod, pressure
Power temperature sensor and the electrical connection of automatically controlled ammonia metering valve.
2. a kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment as claimed in claim 1, its
It is characterised by, the ammonia tank is externally provided with thermal insulation layer.
3. a kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment as claimed in claim 1, its
It is characterised by, the ammonia tank is provided with 5%～15% residual volume V1；The ammonia pressure reducer Pressure reducing ratio k scopes are 1:5～
1:3, after the decompression of ammonia pressure reducer, ammonia pressure is 1～4bar；Voltage stabilizing tank volume V2, ammonia tank residual volume V1, ammonia
Following relation is met between pressure reducer Pressure reducing ratio k, liquefied ammonia injection volume V3 per second：
(V2/k+V1)/V3≤1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620932741.8U CN206016916U (en) | 2016-08-24 | 2016-08-24 | A kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620932741.8U CN206016916U (en) | 2016-08-24 | 2016-08-24 | A kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment |
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| Publication Number | Publication Date |
|---|---|
| CN206016916U true CN206016916U (en) | 2017-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620932741.8U Active CN206016916U (en) | 2016-08-24 | 2016-08-24 | A kind of pressure jet apparatus formula ammonia spraying system for diesel engine for automobile vent gas treatment |
Country Status (1)
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| CN (1) | CN206016916U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401714A (en) * | 2016-08-24 | 2017-02-15 | 中国第汽车股份有限公司 | Mechanical spray nozzle type ammonia gas injection system used for tail gas treatment of automobile diesel engine |
| CN110318913A (en) * | 2019-07-19 | 2019-10-11 | 潍柴动力股份有限公司 | Fuel gas injection control method and device |
-
2016
- 2016-08-24 CN CN201620932741.8U patent/CN206016916U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401714A (en) * | 2016-08-24 | 2017-02-15 | 中国第汽车股份有限公司 | Mechanical spray nozzle type ammonia gas injection system used for tail gas treatment of automobile diesel engine |
| CN106401714B (en) * | 2016-08-24 | 2019-02-26 | 中国第一汽车股份有限公司 | A kind of control method of pressure jet apparatus formula ammonia spraying system |
| CN110318913A (en) * | 2019-07-19 | 2019-10-11 | 潍柴动力股份有限公司 | Fuel gas injection control method and device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |