CN105114194A - General airplane dual-fuel engine combustion system and method - Google Patents
General airplane dual-fuel engine combustion system and method Download PDFInfo
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- CN105114194A CN105114194A CN201510503168.9A CN201510503168A CN105114194A CN 105114194 A CN105114194 A CN 105114194A CN 201510503168 A CN201510503168 A CN 201510503168A CN 105114194 A CN105114194 A CN 105114194A
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Abstract
A general airplane dual-fuel engine combustion system is characterized by comprising an LNG vaporization and premixed natural gas supply device, an electronic-controlled common-rail diesel oil supply device, an electronic control system, an electronic throttle valve and a fuel spray nozzle. A control method of the general airplane dual-fuel engine combustion system comprises the following steps: the electronic control system controls a diesel oil pump with a pressure adjusting device to adjust an engine diesel oil supply pressure; and the electronic control system controls a natural gas injection module and the electronic throttle valve to adjust an engine premixed natural gas supply excess air coefficient and a mixed gas amount. The general airplane dual-fuel engine combustion system and method have the advantages that the pressure in an LNG storage tank is ensured under the action of a self-pressurization unit, so that LNG can flow out from the LNG storage tank through a pipeline under the action of the pressure in the storage tank, and enters an LNG vaporizer to be converted into a gas fuel to be used by an engine, the ignition of high-burning-point LNG fuel is realized without the need of an ignition system and a sparking plug, besides, the combustion speed of the LNG fuel can be increased, the engine is enabled to adopt different dual-fuel matching manners under different working conditions, and the overall performance of the dual-fuel engine is optimized.
Description
Technical field
The present invention relates to a kind of combustion system of engine, particularly relate to utility aircraft dual-fuel engine combustion system and method.
Background technique
In recent years, along with the maturation gradually of utility aircraft technology, its safety and reliability improves greatly.The execution of " suggestion about the low altitude airspace administrative reform of the in-depth China " file issued by the State Council and the Military Commission of the CPC Central Committee along with 2011, by the year two thousand twenty, China will have at least field, the low latitude opening of 80%, and the development for utility aircraft is provided development space and opportunity by this.Can predict, in the near future, navigation industry will occupy a tiny space in Chinese market, also will become one of mainstay of Chinese economic development.
Current utility aircraft is for power substantially with petrol engine and diesel engine.According to the Experience in Development of China's automobile industry and boats and ships industry, adopt petroleum-based gasoline and diesel oil to be the utility aircraft power system of power, the development along with its industry will inevitably produce dependence to petroleum based fuels and serious environmental pollution problem.The application that clean energy resource substitutes traditional fuel has become the main trend of power industry development, while utility aircraft technical development, just the development that will promote utility aircraft technology is taken into account in the use of low stain clean energy resource.
LNG Liquefied natural gas (LNG) is by after natural gas via super-dry depickling process, and be liquefied as liquid a kind of liquid fuel at low temperatures, main component is methane (more than 96%).Liquidus density is 0.42 ~ 0.46t/m
3, liquid calorific value 50MJ/kg.Colourless, tasteless, the nontoxic and non-corrosiveness of LNG, its volume weight is only about 45% of consubstantiality ponding.Compare with diesel oil with gasoline, LNG has the advantages that density is low, cost is low, calorific value is high, and the pollutant produced after LNG burning is simultaneously more much lower than diesel oil.Test on automobile shows, when application LNG is fuel, in tail gas, CO reduces by 97%, HC+NOx and reduces by 72%, CO
2reduce 90, noise decrease 40%, C
6h
6lead powder dirt etc. reduce 100%.Using LNG as the fuel of utility aircraft power system or a brand-new field, yet there are no relevant report.If using the fuel of LNG as utility aircraft power system, also significantly fuel cost can will be reduced while the environmental pollution reducing utility aircraft generation, promote the Economy of utility aircraft.
LNG burning-point is 650 DEG C, exceed a lot than gasoline burning-point 427 DEG C and diesel oil burning-point 220 DEG C, therefore LNG motor is as petrol engine, also need to adopt electronic-igniting ignition mode, release spark by high-pressure electronic spark coil, spark plug, light the mixed gas of rock gas and clean air.The adiabatic flame temperature of LNG, close to 2000 DEG C, can cause spark plug to burn if fuel mixes the uneven focus that occurs burning with air.
The main component of LNG is methane, have in combustion process that velocity of propagation of flame is slow, main combustion period increases, internal pressure of combustion chamber and temperature rise feature slowly, cause that the pressure of explosion of LNG motor is poor, the dynamic property of motor is strong when not using diesel oil, simultaneously large because period of combustion is long, the volume of gaseous fuel own accounts for charge volume ratio, the air mass flow little Shi extreme operating condition lower combustion chamber incomplete combustion, the pollutant emission that cause entering firing chamber are high, even flame-out.
Summary of the invention
For to solve when utility aircraft power system uses petroleum based fuels caused environment and social concern and use the technical problem existed during LNG fuel, the invention provides a kind of utility aircraft dual-fuel engine combustion system and method, this system and method adopts LNG and diesel oil two kinds of fuel.According to the Operation Conditions of motor, by controlling natural gas injection module and electronic throttle, provide appropriate certain density rock gas and air Mixture.Simultaneously, in the engine compression strokes later stage, spray into a small amount of diesel oil as Ignition sources, after diesel pilot spray bundle catches fire, in firing chamber, diverse location forms multiple fiery core, premixed natural gas in some gas cylinder and air Mixture, make rock gas and air Mixture can complete combustion heat release process within the as far as possible short time, realize the object of the quick low-discharging high-efficient burning of motor, without mounting points firearm, spark plug can be it also avoid while decreasing engine complexity and burnt caused problem in motor simultaneously.
To achieve these goals, the present invention adopts following technological scheme:
Can be applicable to the use LNG of utility aircraft and a dual-fuel engine combustion system for diesel oil, comprise LNG vaporization and premixed natural gas supplier, electric-controlled co-rail diesel oil supplier, automatical control system, electronic throttle and oil nozzle; Described electric-controlled co-rail diesel oil supplier, premixed natural gas supplier, electronic throttle are connected with electric control system ECU respectively with oil nozzle; Described electronic throttle and oil nozzle are installed on the engine, and described electronic throttle is connected with premixed natural gas supplier, and described oil nozzle is connected with electric-controlled co-rail diesel oil supplier; Electric control system ECU controls rock gas and the air Mixture that premixed natural gas supplier provides setting concentration, and regulates the pressure of supply diesel oil, controls the time for spraying of diesel oil.
Described premixed natural gas supplier comprises: LNG storage tank, storage tank are from compress cell, LNG vaporizer, rock gas knock out drum, voltage stabilizer, natural gas flowmeter, natural gas injection module and mixer; Described LNG storage tank for storing low temperature LNG, and meets requirement to pressure in LNG storage tank with storage tank from compress cell.LNG storage tank is connected with LNG vaporizer, and under the effect of LNG storage tank internal pressure, in LNG vaporizer, phase-state change occurring after LNG stream goes out LNG storage tank, is gaseous state by liquid conversion.LNG vaporizer is connected with knock out drum, and knock out drum is connected with voltage stabilizer, and voltage stabilizer is connected with natural gas injection module, and natural gas injection module is connected with air mixer with rock gas, and storage tank is arranged on below LNG storage tank from compress cell;
Described mixer is rock gas and air mixer;
Also natural gas flowmeter is installed between described voltage stabilizer and natural gas injection module;
Described natural gas injection module is connected with automatical control system, for controlling the fuel flow rate of natural gas injection module;
Described electronic throttle is connected with automatical control system, for controlling the flow of the mixed gas entering motor.
Described electric-controlled co-rail diesel oil supplier comprises: the diesel pump of fuel tank, diesel-oil filter, band pressure regulator, diesel oil rail and oil nozzle; Described fuel tank is connected with diesel-oil filter, diesel-oil filter is connected with the input end of the diesel pump of band pressure regulator, the low-pressure oil return pipe road of diesel pump is connected with fuel tank, fuel oil injection piping is connected with diesel oil rail, diesel oil rail is connected with oil nozzle by high-pressure oil pipe, diesel oil rail is connected with diesel pump by low pressure line, and the low-pressure oil return pipe road of oil nozzle is connected with diesel pump;
Between described diesel-oil filter and diesel pump, diesel oil fuel consumption meter is also installed;
One end of described diesel oil rail is provided with diesel oil rail pressure sensor, and described diesel oil rail pressure sensor is connected with automatical control system, for gathering the pressure in diesel oil rail;
Described automatical control system is connected with the diesel pump of band pressure regulator, for controlling the rotating speed of diesel pump and then controlling diesel oil flow.
Described oil nozzle and electronic throttle are installed on the cylinder cap of airplane engine, and the pipeline of the inlet end of airplane engine is provided with intercooler, are provided with turbosupercharger between the intake duct of airplane engine and air outlet flue.The chemical energy of fuel is the propeller cavitation that mechanical energy passes to utility aircraft by fuel after airplane engine combustion, promotes aircraft and advances;
The side of described airplane engine is also provided with speed probe, speed probe by signal transmission to automatical control system, for airplane engine performance monitoring;
The admission line of described airplane engine is provided with suction pressure temperature sensing, and exhaust duct is provided with exhaust gas oxygen sensor, the signal transmission of sensor to automatical control system, for formulating engine control strategy.
Can be applicable to a controlling method for the use LNG of utility aircraft and the dual-fuel engine combustion system of diesel oil, comprising:
According to the operating mode of motor, automatical control system regulates the pressure of supply engine diesel oil by the diesel pump of control cincture pressure regulator, and automatical control system regulates the excess air coefficient of supply engine premixed natural gas, the amount of mixed gas by control natural gas injection module, electronic throttle;
Under motor accidental conditions, required diesel oil amount is for the mixed gas of ignite rock gas and air, and required fuel flow rate is little, can realize igniting function;
Under extreme operating condition, the combustibility of the mixed gas of rock gas and air is bad, and the pressure by increasing diesel pump increases the flow of diesel fuel nozzle supply diesel oil.
advantage of the present invention
The invention provides and be a kind ofly applicable to LNG and diesel oil be fuel dual-fuel engine combustion system and method, low temperature LNG is stored in LNG storage tank, the pressure in LNG storage tank is ensured under the effect from compress cell, make LNG under the effect of tank inner pressure, LNG storage tank can be flowed out by pipeline, and entering LNG vaporizer, to realize LNG by liquid conversion be the use of gaseous fuel for motor.
The present invention is according to the physical property of LNG and diesel oil and burning feature, have employed and use diesel oil to light the mode of the mixed gas of rock gas and air, achieve the LNG fuel not needing ignition system and spark plug just can light high burning-point, the velocity of combustion of LNG fuel can be improved simultaneously.
The present invention, according to the Operation Conditions of motor, by flow and concentration, the diesel injection pressures of electric control system controls mixed gas, realizes motor and can adopt different double fuel matching ways under different operating mode, optimize the overall performance of duel fuel engine.
accompanying drawing illustrates:
Fig. 1 is utility aircraft dual-fuel engine combustion system structural representation of the present invention;
In figure: 1LNG storage tank, 2 storage tanks are from diesel pump, 18 diesel oil fuel consumption meter 19 diesel-oil filters, 20 fuel tanks of compress cell, 3LNG vaporizer, 4 knock out drums, 5 voltage stabilizers, 6 natural gas flowmeters, 7 natural gas injection modules, 8 mixers, 9 turbosupercharger, 10 intercoolers, 11 electronic throttles, 12 oil nozzles, 13 propeller cavitations, 14 motors, 15 automatical control systems, 16 diesel oil rails, 17 band pressure regulators.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As shown in Figure 1, dual-fuel engine combustion system, comprise: the premixed natural gas supplier controlled respectively by electric control system ECU 14 and electric-controlled co-rail diesel oil supplier, automatical control system 14 regulates the diesel pilot of supply engine 13 certain pressure by the diesel pump 16 of control cincture pressure regulator according to the operating mode of motor 13, automatical control system 14 regulates the premixed natural gas of the certain excess air coefficient of supply engine 13 by control natural gas injection module 7 and electronic throttle 11 according to the operating mode of motor 13.
Premixed natural gas supplier, comprises LNG storage tank 1, storage tank from compress cell 2, LNG vaporizer 3, rock gas knock out drum 4, voltage stabilizer 5, natural gas flowmeter 6, natural gas injection module 7, mixer 8; Low temperature LNG is stored in LNG storage tank 1, and wherein LNG storage tank 1 is double insulation structure, and meets requirement to pressure in LNG storage tank with storage tank from compress cell 2.LNG storage tank 1 is connected with LNG vaporizer 3, and under the effect of LNG storage tank 1 internal pressure, in LNG vaporizer, phase-state change occurring after LNG stream goes out LNG storage tank, is gaseous state by liquid conversion.LNG vaporizer 3 is connected with knock out drum 4, and knock out drum 4 is connected with voltage stabilizer 5, and voltage stabilizer 5 is connected with natural gas injection module 7, and natural gas injection module 7 is connected with air mixer 8 with rock gas; Between voltage stabilizer 5 and natural gas injection module 7, natural gas flowmeter 6 is also installed, storage tank is arranged on below LNG storage tank 1 from compress cell 2.
Electric-controlled co-rail diesel oil supplier, comprising: fuel tank 20, diesel-oil filter 19, the diesel pump 17 of band pressure regulator, diesel oil rail 16 and oil nozzle 12; Fuel tank 20 is connected with diesel-oil filter 19, diesel-oil filter 19 is connected with the input end of the diesel pump 17 of band pressure regulator, the low-pressure oil return pipe road of diesel pump 17 is connected with fuel tank 20, fuel oil injection piping is connected with diesel oil rail 16, diesel oil rail 16 is connected with oil nozzle 12 by high-pressure oil pipe, diesel oil rail 13 is connected with diesel pump 17 by low pressure line, and the low-pressure oil return pipe road of oil nozzle 12 is connected with diesel pump 17.Between diesel-oil filter 19 and diesel pump 17, diesel oil fuel consumption meter 18 is also installed.
Oil nozzle 12 is installed on the cylinder cap of motor 14, the pipeline of the inlet end of motor 14 is provided with intercooler 10, is provided with turbosupercharger 9 between the intake duct of motor 14 and air outlet flue; The admission line of motor 14 is also provided with suction pressure temperature sensing, and exhaust duct is provided with exhaust gas oxygen sensor.The chemical energy of fuel is the propeller cavitation 13 that mechanical energy passes to utility aircraft by fuel after motor combustion, promotes aircraft and advances.The side of motor 9 is also provided with speed probe, and one end of diesel oil rail 16 is provided with diesel oil rail pressure sensor.
Automatical control system 15 is connected respectively with being with the diesel pump 17 of pressure regulator, natural gas injection module 7, electronic throttle 11, oil nozzle 12 and the sensor for signal various in acquisition system, and these sensors comprise diesel oil rail pressure sensor, air inlet temperature/pressure sensor, speed probe and exhaust gas oxygen sensor.
According to the embodiment of the present invention, the fuel supply system of motor comprises premixed natural gas supplier and electric-controlled co-rail diesel oil supplier.In premixed natural gas supplier, low temperature LNG is after storage tank flows out under the effect of compress cell 2 from LNG storage tank 1, through LNG vaporizer 3, after knock out drum 4 and voltage stabilizer 5 voltage stabilizing, the natural gas flowmeter 6 be arranged in gas pipeline measures gas discharge, then natural gas injection module 7 is entered, automatical control system 15 is according to air mass flow, engine speed etc. carry out calculating correction to gas discharge, and after regulating rock gas delivery volume by natural gas injection module 7, rock gas is fed mixer 8, mix with the fresh air entered from air inlet pipeline, the rock gas formed and air Mixture are through turbosupercharger 9 supercharging and after cold in intercooler 10, the firing chamber of motor 14 is entered through electronic throttle 11.
Electric-controlled co-rail diesel oil supplier, when motor operates under different operating mode, diesel oil is through fuel tank 20, after filtering in diesel-oil filter 19, diesel oil rail 16 is entered after diesel pump 17 pressurizes, the rail pressure signal that automatical control system 15 feeds back in conjunction with diesel oil rail pressure sensor according to the parameter that speed probe, suction pressure temperature transducer and exhaust gas oxygen sensor etc. feed back regulates the supply pressure of diesel oil rail 16 and the solenoid valve signal of oil nozzle 12 final controlling element by the diesel pump 17 of band pressure regulator, controls the time for spraying of oil nozzle 12.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technological scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (7)
1. a utility aircraft dual-fuel engine combustion system, is characterized in that: comprise LNG vaporization and premixed natural gas supplier, electric-controlled co-rail diesel oil supplier, automatical control system, electronic throttle and oil nozzle; Described electric-controlled co-rail diesel oil supplier, premixed natural gas supplier, electronic throttle are connected with electric control system ECU respectively with oil nozzle; Described electronic throttle and oil nozzle are installed on the engine, and described electronic throttle is connected with premixed natural gas supplier, and described oil nozzle is connected with electric-controlled co-rail diesel oil supplier; Electric control system ECU controls rock gas and the air Mixture that premixed natural gas supplier provides setting concentration, and regulates the pressure of supply diesel oil, controls the time for spraying of diesel oil.
2. utility aircraft dual-fuel engine combustion system according to claim 1, is characterized in that: described premixed natural gas supplier comprises: LNG storage tank, storage tank are from compress cell, LNG vaporizer, rock gas knock out drum, voltage stabilizer, natural gas flowmeter, natural gas injection module and mixer; Described LNG storage tank is for storing low temperature LNG, and meet requirement to pressure in LNG storage tank with storage tank from compress cell, LNG storage tank is connected with LNG vaporizer, under the effect of LNG storage tank internal pressure, in LNG vaporizer, phase-state change is there is after LNG stream goes out LNG storage tank, be gaseous state by liquid conversion, LNG vaporizer is connected with knock out drum, knock out drum is connected with voltage stabilizer, voltage stabilizer is connected with natural gas injection module, natural gas injection module is connected with air mixer with rock gas, and storage tank is arranged on below LNG storage tank from compress cell.
3. utility aircraft dual-fuel engine combustion system according to claim 2, is characterized in that: described mixer is rock gas and air mixer; Also natural gas flowmeter is installed between described voltage stabilizer and natural gas injection module; Described natural gas injection module is connected with automatical control system, for controlling the fuel flow rate of natural gas injection module; Described electronic throttle is connected with automatical control system, for controlling the flow of the mixed gas entering motor.
4. utility aircraft dual-fuel engine combustion system according to claim 1, is characterized in that: described electric-controlled co-rail diesel oil supplier comprises: the diesel pump of fuel tank, diesel-oil filter, band pressure regulator, diesel oil rail and oil nozzle; Described fuel tank is connected with diesel-oil filter, diesel-oil filter is connected with the input end of the diesel pump of band pressure regulator, the low-pressure oil return pipe road of diesel pump is connected with fuel tank, fuel oil injection piping is connected with diesel oil rail, diesel oil rail is connected with oil nozzle by high-pressure oil pipe, diesel oil rail is connected with diesel pump by low pressure line, and the low-pressure oil return pipe road of oil nozzle is connected with diesel pump.
5. utility aircraft dual-fuel engine combustion system according to claim 4, is characterized in that: be also provided with diesel oil fuel consumption meter between described diesel-oil filter and diesel pump;
One end of described diesel oil rail is provided with diesel oil rail pressure sensor, and described diesel oil rail pressure sensor is connected with automatical control system, for gathering the pressure in diesel oil rail;
Described automatical control system is connected with the diesel pump of band pressure regulator, for controlling the rotating speed of diesel pump and then controlling diesel oil flow.
6. utility aircraft dual-fuel engine combustion system according to claim 1, it is characterized in that: described oil nozzle and electronic throttle are installed on the cylinder cap of airplane engine, the pipeline of the inlet end of airplane engine is provided with intercooler, turbosupercharger is provided with between the intake duct of motor and air outlet flue, the chemical energy of fuel is the propeller cavitation that mechanical energy passes to utility aircraft by fuel after airplane engine combustion, promotes aircraft and advances;
The side of described airplane engine is also provided with speed probe, and signal transmission to automatical control system, is monitored for engine performance by speed probe;
The admission line of described airplane engine is provided with suction pressure temperature transducer, and exhaust duct is provided with exhaust gas oxygen sensor, the signal transmission of sensor to automatical control system, for formulating engine control strategy.
7. can be applicable to a controlling method for the use LNG of utility aircraft and the dual-fuel engine combustion system of diesel oil, it is characterized in that: comprising:
According to the operating mode of motor, automatical control system regulates the pressure of supply engine diesel oil by the diesel pump of control cincture pressure regulator, and automatical control system regulates the excess air coefficient of supply engine premixed natural gas, the amount of mixed gas by control natural gas injection module, electronic throttle;
Under motor accidental conditions, required diesel oil amount is for the mixed gas of ignite rock gas and air, and required fuel flow rate is little, can realize igniting function;
Under extreme operating condition, the combustibility of the mixed gas of rock gas and air is bad, and the pressure by increasing diesel pump increases the flow of diesel fuel nozzle supply diesel oil.
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| CN201510503168.9A CN105114194A (en) | 2015-08-17 | 2015-08-17 | General airplane dual-fuel engine combustion system and method |
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Cited By (6)
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| CN108691693A (en) * | 2018-06-13 | 2018-10-23 | 哈尔滨工程大学 | A kind of natural gas engine fuel supply system and control method with return duct |
| CN109026374A (en) * | 2018-07-25 | 2018-12-18 | 福州大学 | Natural gas Diesel Dual-Fuel Engine and control method based on excess air coefficient |
| CN109915266A (en) * | 2019-04-26 | 2019-06-21 | 上海海事大学 | A kind of dual-fuel engine combustion system peculiar to vessel and method |
| CN110056774A (en) * | 2019-05-29 | 2019-07-26 | 潍柴西港新能源动力有限公司 | Dual fuel engine dynamic natural gas recycling device and method |
| CN110206661A (en) * | 2019-04-30 | 2019-09-06 | 天津大学 | A kind of dual fuel engine single cylinder engine test platform pressurized fuel gas feed system |
| CN112901339A (en) * | 2021-01-15 | 2021-06-04 | 河北工业大学 | Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108691693A (en) * | 2018-06-13 | 2018-10-23 | 哈尔滨工程大学 | A kind of natural gas engine fuel supply system and control method with return duct |
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| CN109915266A (en) * | 2019-04-26 | 2019-06-21 | 上海海事大学 | A kind of dual-fuel engine combustion system peculiar to vessel and method |
| CN110206661A (en) * | 2019-04-30 | 2019-09-06 | 天津大学 | A kind of dual fuel engine single cylinder engine test platform pressurized fuel gas feed system |
| CN110206661B (en) * | 2019-04-30 | 2023-07-14 | 天津大学 | High-pressure gas fuel supply system of dual-fuel engine single-cylinder engine test platform |
| CN110056774A (en) * | 2019-05-29 | 2019-07-26 | 潍柴西港新能源动力有限公司 | Dual fuel engine dynamic natural gas recycling device and method |
| CN112901339A (en) * | 2021-01-15 | 2021-06-04 | 河北工业大学 | Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof |
| CN112901339B (en) * | 2021-01-15 | 2022-04-26 | 河北工业大学 | Direct injection natural gas engine system based on ammonia pyrolysis device and control method thereof |
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Application publication date: 20151202 |