CN206016915U - A kind of automatically controlled nozzle-type ammonia spraying system for diesel engine vent gas process - Google Patents
A kind of automatically controlled nozzle-type ammonia spraying system for diesel engine vent gas process Download PDFInfo
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- CN206016915U CN206016915U CN201620932773.8U CN201620932773U CN206016915U CN 206016915 U CN206016915 U CN 206016915U CN 201620932773 U CN201620932773 U CN 201620932773U CN 206016915 U CN206016915 U CN 206016915U
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- ammonia
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- nozzle
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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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- 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
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Abstract
The utility model discloses a kind of automatically controlled nozzle-type ammonia spraying system for diesel engine vent gas process, including ammonia tank, liquid level and temperature sensor, electrically heated rod, ammonia pressure reducer, vacuum tank, pressure-temperature sensor, automatically controlled ammonia nozzle and controller；Ammonia tank is fixed on car load vehicle frame, storage liquefied ammonia in ammonia tank, 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, vacuum tank is fixed on car load vehicle frame, pressure-temperature sensor is integrated on vacuum tank, vacuum tank connects automatically controlled ammonia nozzle by pipeline, on vehicle motor blast pipe, controller is electrically connected ammonia nozzle respectively with liquid level and temperature sensor, electrically heated rod, pressure-temperature sensor and automatically controlled ammonia nozzle.
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 automatically controlled nozzle-type ammonia spraying system for diesel engine vent gas process.
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
The purpose of this utility model is to provide a kind of automatically controlled nozzle-type ammonia injection for diesel engine for automobile vent gas treatment
System, which overcomes the disadvantage mentioned above of prior art presence, and winter does not freeze, can work through simple heating not even heating
Make, in hgher efficiency；Direct reaction after ejection, it is not necessary to hydrolyze, insensitive to delivery temperature；Ammonia is the former material for producing urea
Material, injection do not need water, can save significantly on the energy and resource.
The purpose of this utility model is achieved through the following technical solutions：
The utility model provides a kind of automatically controlled nozzle-type ammonia spraying system for diesel engine vent gas process, including liquefied ammonia
Tank, liquid level and temperature sensor, electrically heated rod, ammonia pressure reducer, vacuum tank, pressure-temperature sensor, automatically controlled ammonia nozzle and control
Device processed；The ammonia tank is fixed on car load vehicle frame, storage liquefied ammonia in ammonia tank, and liquid level and temperature sensor and electrically heated rod are integrated
In ammonia tank, ammonia tank connects ammonia pressure reducer by pipeline, and ammonia pressure reducer connects vacuum tank by pipeline, and vacuum tank is solid
It is scheduled on car load vehicle frame, pressure-temperature sensor is integrated on vacuum tank, vacuum tank connects automatically controlled ammonia nozzle, ammonia by pipeline
On vehicle motor blast pipe, controller is passed gas jets respectively with liquid level and temperature sensor, electrically heated rod, pressure and temp
Sensor and the electrical connection of automatically controlled ammonia nozzle.Injection pressure is provided by the saturated vapor pressure of liquefied ammonia, and ammonia is through ammonia pressure reducer, voltage stabilizing
Automatically controlled ammonia nozzle is reached after tank, ammonia pipeline, and pressure-temperature sensor is integrated on vacuum tank, and controller combines injection pressure
With control nozzle injections such as engine operating conditions.
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
There is following relation between product V1, ammonia pressure reducer Pressure reducing ratio k, liquefied ammonia injection volume V3 per second：
(V2/k+V1)/V3≤1%
Further, the automatically controlled ammonia nozzle is air-cooled using engine cool water cooling or radiating fin.
The utility model provides a kind of control of the automatically controlled nozzle-type ammonia spraying system for diesel engine vent gas process simultaneously
Method processed, including procedure below：Controller passes through liquid level and temperature sensor monitor in real time ammonia tank internal temperature, when in ammonia tank
When portion's temperature is less than default maintenance temperature, liquefied ammonia in controller control electrically heated rod heating ammonia tank is allowed to temperature liter and is up to
To temperature is maintained, ammonia tank internal temperature is raised causes pressure to increase, and the gaseous state ammonia after pressurization is reduced pressure by ammonia pressure reducer
After be transported in vacuum tank, controller according to the pressure-temperature sensor feedback information on vacuum tank and with reference to engine run
Situation sends injection pulse width and injection frequency signal to automatically controlled ammonia nozzle, ammonia is ejected in blast pipe and is reacted.
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 nozzle and open certain duration to meet row
Put demand.
Further, the injection frequency control of the automatically controlled ammonia nozzle is adjusted according to liquid level in ammonia tank and pressure flexible
Section；The injection frequency of the automatically controlled ammonia nozzle is adjustable according to engine operating condition flexibility.
Description of the drawings
Fig. 1 is schematic diagram of the present utility model.
Fig. 2 is control strategy 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- stable can 6- pressure and temps
The automatically controlled ammonia nozzle 8- 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 automatically controlled nozzle-type ammonia spraying system for diesel engine vent gas process, including 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 nozzle 7,
Controller (ECU) 8.Wherein, ammonia tank 1 is fixed on car load vehicle frame, stores integrated liquid in liquefied ammonia and ammonia tank 1 in ammonia tank 1
Position temperature sensor 2 and electrically heated rod 3, ammonia tank 1 connect ammonia pressure reducer 4 by pipeline, and ammonia pressure reducer 4 is connected by pipeline
Vacuum tank 5 is connect, vacuum tank 5 is fixed on car load vehicle frame, integrated pressure temperature sensor 6 on vacuum tank 5, vacuum tank 5 is by pipe
Road connects automatically controlled ammonia nozzle 7, and on vehicle motor blast pipe, controller 8 is passed ammonia nozzle 7 respectively with liquid level temperature
Sensor 2, electrically heated rod 3, pressure-temperature sensor 6 and automatically controlled ammonia nozzle 7 are electrically connected.Saturated vapor of the injection pressure by liquefied ammonia
Pressure is provided, and ammonia reaches automatically controlled ammonia nozzle after ammonia pressure reducer, vacuum tank, ammonia pipeline, and pressure-temperature sensor is integrated
On vacuum tank, ECU combines the control nozzle injection such as injection pressure and engine operating condition.
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,
In ammonia tank 1, the saturated vapor pressure of liquefied ammonia produces pressure, and therefore ammonia tank 1 has storage ammonia and provides ammonia injection pressure
Function.The outer design thermal insulation layer of ammonia tank 1, it is to avoid winter tank interior temperature spend low cannot set up injection pressure, also avoid in summer tank
Temperature is too high to cause the too high formation of pressure inside the tank 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 to 1:3, after ammonia pressure reducer 4 reduces pressure, ammonia pressure is 1～4bar, it is to avoid pipeline inner pressure is too high to cause danger, and compared with
Low injection pressure can be obviously improved nozzle simultaneously.
Vacuum tank 5 is a container with a constant volume, integrated pressure temperature sensor 6 on vacuum tank 5；The ammonia of vaporization
Gas enters vacuum tank 5 by pipeline after 4 pressure regulation of ammonia pressure reducer, the measurement ammonia of pressure-temperature sensor 6 on vacuum tank 5
Temperature degree 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 V2,1 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 a kind of control method of the automatically controlled nozzle-type ammonia spraying system for diesel engine vent gas process, bag
Include procedure below：Controller by liquid level and temperature sensor monitor in real time ammonia tank internal temperature, when ammonia tank internal temperature low
When default maintenance temperature, liquefied ammonia in controller control electrically heated rod heating ammonia tank is allowed to temperature rising and reaches 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 nozzle sends injection pulse width and injection frequency signal, ammonia is ejected in blast pipe and is reacted.
In ammonia tank 1, temperature controls electrically heated rod 3-dimensional by controller 8 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 controller 8 is controlled
The different maintenance temperature of system, with energy saving, improves response.During engine cold-start, if temperature is in 0～10 in ammonia tank 1
DEG C, injection is can control still, now injection pressure is relatively low, writes injection pressure penalty coefficient in controller 8, to ensure emitted dose base
This is accurately；If liquefied ammonia is heated to more than 10 DEG C less than 0 DEG C by temperature first in ammonia tank 1, it is ensured that enough after injection pressure,
Sprayed.
Automatically controlled ammonia nozzle 7 is directly installed on the exhaust pipe of engine, by engine cool water cooling or radiating fin wind
Cold；Injection is taken and determines frequency, controls the control mode of single injection event duty ratio of time；Write injection pressure and spray in controller 8
Temperature compensation coefficient is penetrated, according to the temperature of ammonia, pressure value in ammonia tank 1, needed in conjunction with present engine condition calculating
Ammonia emitted dose, controls automatically controlled ammonia nozzle 7 and opens certain duration to meet emissions requirements.
The injection frequency control of automatically controlled ammonia nozzle 7 is adjusted according to liquid level in ammonia tank 1 and pressure flexible, liquid level, pressure
When suitable, using 1Hz frequencies, while NOx conversion efficiency is ensured, automatically controlled 7 life-span of ammonia nozzle is improved；When liquid level, pressure inclined
When low, take 2Hz～10Hz frequencies to spray, increase injection interval, liquefied ammonia is fully vaporized, to ensure enough injection pressures.
According to engine operating condition soft readjustment, when engine is under the warm high load capacity operating mode of high row, reduction reaction is easier to injection frequency
Realize, using 1Hz frequencies, to improve 7 life-span of nozzle while NOx conversion efficiency is ensured；When engine in low row's temperature low
Under load condition, using upper frequency 2Hz～10Hz, to ensure the mixture homogeneity of ammonia and exhaust, reaction efficiency is improved, is subtracted
Few ammonia is escaped.
Claims (4)
1. a kind of for diesel engine vent gas process automatically controlled nozzle-type ammonia spraying system, it is characterised in that including ammonia tank, liquid
Position temperature sensor, electrically heated rod, ammonia pressure reducer, vacuum tank, pressure-temperature sensor, automatically controlled ammonia nozzle and controller；
The ammonia tank is fixed on car load vehicle frame, storage liquefied ammonia in ammonia tank, and liquid level and temperature sensor and electrically heated rod are integrated in liquid
In ammonia tank, ammonia tank connects ammonia pressure reducer by pipeline, and ammonia pressure reducer connects vacuum tank by pipeline, and vacuum tank is fixed on
On car load vehicle frame, pressure-temperature sensor is integrated on vacuum tank, and vacuum tank connects automatically controlled ammonia nozzle, automatically controlled ammonia by pipeline
On vehicle motor blast pipe, controller is passed gas jets respectively with liquid level and temperature sensor, electrically heated rod, pressure and temp
Sensor and the electrical connection of automatically controlled ammonia nozzle.
2. as claimed in claim 1 a kind of for diesel engine vent gas process automatically controlled nozzle-type ammonia spraying system, its feature
It is, the ammonia tank is externally provided with thermal insulation layer.
3. as claimed in claim 1 a kind of for diesel engine vent gas process automatically controlled nozzle-type ammonia spraying system, its feature
It is, 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 decompression
Following relation is met between device Pressure reducing ratio k, liquefied ammonia injection volume V3 per second：
(V2/k+V1)/V3≤1%.
4. as claimed in claim 1 a kind of for diesel engine vent gas process automatically controlled nozzle-type ammonia spraying system, its feature
It is, the automatically controlled ammonia nozzle is air-cooled using engine cool water cooling or radiating fin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620932773.8U CN206016915U (en) | 2016-08-24 | 2016-08-24 | A kind of automatically controlled nozzle-type ammonia spraying system for diesel engine vent gas process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620932773.8U CN206016915U (en) | 2016-08-24 | 2016-08-24 | A kind of automatically controlled nozzle-type ammonia spraying system for diesel engine vent gas process |
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| Publication Number | Publication Date |
|---|---|
| CN206016915U true CN206016915U (en) | 2017-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620932773.8U Active CN206016915U (en) | 2016-08-24 | 2016-08-24 | A kind of automatically controlled nozzle-type ammonia spraying system for diesel engine vent gas process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401712A (en) * | 2016-08-24 | 2017-02-15 | 中国第汽车股份有限公司 | Electric-control spray nozzle type ammonia gas injection system used for tail gas treatment of diesel engine |
-
2016
- 2016-08-24 CN CN201620932773.8U patent/CN206016915U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106401712A (en) * | 2016-08-24 | 2017-02-15 | 中国第汽车股份有限公司 | Electric-control spray nozzle type ammonia gas injection system used for tail gas treatment of diesel engine |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |