CN114483333A - Dual-fuel engine test system and method - Google Patents

Dual-fuel engine test system and method Download PDF

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Publication number
CN114483333A
CN114483333A CN202210092734.1A CN202210092734A CN114483333A CN 114483333 A CN114483333 A CN 114483333A CN 202210092734 A CN202210092734 A CN 202210092734A CN 114483333 A CN114483333 A CN 114483333A
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ammonia
gas
engine
natural gas
fuel
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CN114483333B (en
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李格升
魏文文
张尊华
陈伟泽
阮智邦
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0644—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being hydrogen, ammonia or carbon monoxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
    • F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
    • F02B43/12—Methods of operating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/08—Safety, indicating, or supervising devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0642—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
    • F02D19/0647—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions the gaseous fuel being liquefied petroleum gas [LPG], liquefied natural gas [LNG], compressed natural gas [CNG] or dimethyl ether [DME]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • 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
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention discloses a dual-fuel engine test system and method, which are applied to the technical field of internal combustion engine tests, can realize switching of running modes of various engines, can simulate cracked mixed gas with different proportions and ammonia and natural gas with different mixing ratios, and realize performance tests of the engines under different fuel conditions. The system comprises a cracked gas simulation device, a cracking gas simulation device and a cracking gas simulation device, wherein the cracked gas simulation device is used for simulating mixed gas with different proportions generated by ammonia gas cracking; the ammonia generating device is used for generating ammonia; a natural gas generating device for generating natural gas; the fuel mixer is provided with a first fuel input end and a first fuel output end; the electronic throttle valve is provided with an electronic throttle valve air inlet end and an electronic throttle valve air outlet end; a fuel-air mixer provided with a second fuel input, a third fuel input and a second fuel output; the engine is provided with an engine air inlet end and an engine exhaust end.

Description

Dual-fuel engine test system and method
Technical Field
The invention relates to the technical field of internal combustion engine experiments, in particular to a dual-fuel engine test system and method.
Background
The engine is used as the main power source of the transportation industry, and the emission problem of greenhouse gases is serious. Natural gas, as a fuel with a relatively low carbon content, has been used in vehicles and ships. In addition, ammonia is widely recognized as an alternative to future energy sources as a carbon-free fuel. The emission of greenhouse gases is further reduced on the basis of a natural gas engine by mixing ammonia gas in the natural gas engine. But the pure ammonia engine power is lower due to the slower combustion speed of the ammonia gas. In the related art, some engines crack ammonia by using the temperature of exhaust gas, but the proportion of mixed gas after cracking is fixed, and switching between different fuels is difficult to realize. Moreover, the related engine test equipment is difficult to realize the performance test of mixed combustion of cracked gas and ammonia with different mixed gas ratios and the performance test of dual-fuel mixed combustion with different ratios.
Disclosure of Invention
In order to solve at least one of the technical problems, the invention provides a dual-fuel engine test system and a method, which can realize the switching of multiple engine operation modes, can simulate cracked mixed gas with different proportions and ammonia and natural gas with different mixing ratios, and realize the performance test of an engine under the condition of different fuels.
In one aspect, an embodiment of the present invention provides a dual-fuel engine testing system, including:
the pyrolysis gas simulation device is used for simulating mixed gas with different proportions generated by ammonia pyrolysis;
an ammonia gas generation device for generating ammonia gas;
a natural gas generating device for generating natural gas;
the fuel mixer is provided with a first fuel input end and a first fuel output end, and the ammonia gas generating device and the natural gas generating device are both connected with the first fuel input end;
the electronic throttle valve is provided with an electronic throttle valve air inlet end and an electronic throttle valve air outlet end, the electronic throttle valve air inlet end is connected with the pyrolysis gas simulation device, and an air inlet is formed in a connecting pipeline of the electronic throttle valve air inlet end and the pyrolysis gas simulation device;
the fuel-air mixer is provided with a second fuel input end, a third fuel input end and a second fuel output end, the second fuel input end is connected with the air outlet end of the electronic throttle valve, and the third fuel input end is connected with the first fuel output end;
the engine is provided with an engine air inlet end and an engine exhaust end, the engine air inlet end is connected with the second fuel output end, and the engine exhaust end is used for discharging waste gas.
The dual-fuel engine test system provided by the embodiment of the invention at least has the following beneficial effects: the cracked gas simulation device simulates cracked gases with different proportions under different working conditions, and the cracked gases are mixed with ammonia gas output by the ammonia gas generation device in the fuel-air mixer and then input into the engine for combustion, so that different cracked products under different engine working conditions are simulated, an engine mode with the cracked gases with different proportions is realized, and the performance test of the cracked gases with different proportions on the engine is realized. Meanwhile, the amount of ammonia output by the ammonia gas generating device and the amount of natural gas output by the natural gas generating device are controlled through the combined output of the ammonia gas generating device and the natural gas generating device, the output ammonia gas and the output natural gas are mixed in a fuel mixer, then input into a fuel air mixer to be mixed with air, and then input into the fuel of the engine, so that the dynamic change test of the mixed fuel of the engine under ammonia and natural gas with different mixing ratios is realized. In addition, the pure ammonia or pure natural gas working mode can be realized through the independent work of the ammonia gas generating device or the natural gas generating device, so that the multi-mode switching and the performance test of the engine under different working modes are realized.
According to some embodiments of the invention, the ammonia gas generation device comprises:
a liquid ammonia tank for storing liquid ammonia;
the ammonia mass flow meter is provided with a first ammonia inlet end and a first ammonia outlet end, and the first ammonia inlet end is connected with the liquid ammonia tank;
the ammonia flow controller is provided with a second ammonia inlet end and a second ammonia outlet end, the second ammonia inlet end is connected with the first ammonia outlet end, and the second ammonia outlet end is connected with the first fuel input end of the fuel mixer.
According to some embodiments of the invention, the natural gas generation plant comprises:
an LNG tank for storing LNG;
the natural gas mass flow meter is provided with a first natural gas inlet end and a first natural gas outlet end, and the first natural gas inlet end is connected with the liquefied natural gas tank;
the natural gas flow controller is provided with a second natural gas inlet end and a second natural gas outlet end, the second natural gas inlet end is connected with the first natural gas outlet end, the second natural gas outlet end is connected with the first fuel input end of the fuel mixer.
According to some embodiments of the invention, the cracked gas simulation apparatus comprises:
the pyrolysis gas mixer is provided with a pyrolysis gas mixing inlet end and a pyrolysis gas mixing output end;
a hydrogen tank for storing hydrogen;
the hydrogen mass flow controller is provided with a first hydrogen inlet end and a first hydrogen outlet end, the first hydrogen inlet end is connected with the hydrogen tank, and the first hydrogen outlet end is connected with the pyrolysis gas mixed inlet end;
the nitrogen tank is used for storing nitrogen;
the device comprises a nitrogen mass flow controller, a cracking gas mixing inlet end, a cracking gas mixing outlet end and a cracking gas mixing inlet end, wherein the nitrogen mass flow controller is provided with a first nitrogen inlet end and a first nitrogen outlet end;
the ammonia gas mass flow controller is provided with a third ammonia gas inlet end and a third ammonia gas outlet end, the third ammonia gas inlet end is connected to a pipeline connecting the first ammonia gas inlet end and the liquid ammonia tank to form a second ammonia gas branch, and the third ammonia gas outlet end is connected with the pyrolysis gas mixed inlet end;
and the stop valve is arranged on the second ammonia branch and is used for controlling the on-off state of the second ammonia branch.
According to some embodiments of the invention, the system further comprises:
the device comprises a turbocharger, a pyrolysis gas simulation device and a fresh air inlet, wherein the turbocharger is provided with a first turbine air inlet end and a first turbine air outlet end, the pyrolysis gas simulation device is connected with the first turbine air inlet end, and a fresh air inlet is formed in a pipeline connecting the pyrolysis gas simulation device and the first turbine air inlet end;
the intercooler is provided with an intercooler water tank, the intercooler is provided with an intercooler air inlet end and an intercooler air outlet end, the intercooler air inlet end is connected with the first turbine air outlet end, the intercooler air outlet end is connected with the electronic throttle air inlet end, and the intercooler is used for cooling mixed gas output by the turbocharger; and the pipeline connecting the first ammonia inlet end and the liquid ammonia tank is arranged on the intercooling water tank.
According to some embodiments of the invention, the turbocharger is further provided with a second turbine inlet end connected to the engine exhaust end and a second turbine outlet end for discharging exhaust gases.
In another aspect, an embodiment of the present invention provides a method for testing a dual-fuel engine, where the method includes the following steps:
acquiring an engine working mode; the engine working modes comprise a pure natural gas mode, a natural gas and ammonia mixed combustion mode and a pure ammonia pyrolysis gas or hydrogen mode;
adjusting the working states of the natural gas generating device, the cracked gas simulating device and the ammonia gas generating device according to the working mode of the engine; wherein, adjust natural gas generating device, pyrolysis gas analogue means and ammonia generating device operating condition, include:
when the working mode of the engine is a pure natural gas mode, acquiring the load of the engine; determining an opening value of the electronic throttle valve according to the load, the engine speed and the excess air coefficient, and correspondingly adjusting the opening value of the electronic throttle valve; acquiring the air pressure of an air outlet end of the electronic throttle valve, and calculating the fresh air quantity according to the air pressure; calculating an air-fuel ratio of the engine based on the fresh air amount; adjusting the working state of the natural gas generating device according to the air-fuel ratio;
or when the working mode of the engine is a natural gas and ammonia mixed combustion mode, acquiring a preset mixing ratio of natural gas and ammonia; adjusting the working states of the natural gas generating device and the ammonia generating device according to the preset mixing ratio of the natural gas and the ammonia;
or when the working mode of the engine is a pure ammonia pyrolysis gas or hydrogen gas mode, acquiring the preset working condition of the engine; controlling the engine to run under an idle working condition; according to the preset working condition, setting a pyrolysis gas mass flow value according to a preset pyrolysis gas and fuel ratio; adjusting the natural gas generating device, the cracked gas simulating device and the ammonia gas generating device according to the preset cracked gas and fuel ratio and the cracked gas mass flow value; and determining that the idling working condition is stable in operation, and adjusting the ammonia gas generating device according to the preset working condition of the engine.
According to some embodiments of the invention, before the step of obtaining the engine operating mode, the method further comprises the steps of:
controlling the natural gas generating device to be started, and closing the ammonia gas generating device and the pyrolysis gas simulating device;
the method comprises the steps of controlling the engine to run under an idle working condition, enabling the engine to run under the idle working condition for a first preset time, enabling the temperature of cooling liquid of the engine to be larger than or equal to a first preset temperature, and enabling the temperature of engine oil of the engine to be larger than or equal to a second preset temperature.
According to some embodiments of the invention, after the step of adjusting the operating states of the natural gas generating device, the cracked gas simulating device and the ammonia gas generating device according to the engine operating mode is performed, the method further comprises the following steps:
controlling the engine to enter the idle working condition for operation;
controlling the ammonia gas generating device to reduce the output of ammonia gas fuel, and controlling the natural gas generating device to increase the output of natural gas;
and determining that the engine runs for a second preset time under the idling working condition, and controlling the engine to stop.
According to some embodiments of the invention, the adjusting the working states of the natural gas generation device and the ammonia generation device according to the preset blending ratio of the natural gas and the ammonia gas comprises:
controlling the pressure of the ammonia gas output by the ammonia gas generating device and the pressure of the natural gas output by the natural gas generating device to be stabilized at a preset pressure value;
according to the preset mixing ratio of the natural gas and the ammonia gas, carrying out first adjustment on the opening degree value of the ammonia flow controller and the opening degree value of the natural gas flow controller;
acquiring natural gas mass flow data detected by a natural gas mass flow meter in real time and ammonia gas mass flow data detected by an ammonia mass flow meter in real time;
and secondly adjusting the opening degree value of the ammonia flow controller and the opening degree value of the natural gas flow controller according to the natural gas mass flow data and the ammonia gas mass flow data.
Drawings
FIG. 1 is a schematic diagram of a dual fuel engine test system provided by an embodiment of the present invention;
FIG. 2 is a flow chart of a method for testing a dual fuel engine provided by an embodiment of the present invention.
Detailed Description
The embodiments described in the embodiments of the present application should not be construed as limiting the present application, and all other embodiments that can be obtained by a person skilled in the art without making any inventive step shall fall within the scope of protection of the present application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is understood that "some embodiments" may be the same subset or different subsets of all possible embodiments, and may be combined with each other without conflict.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the application.
In the large environment with intensified global warming, reducing greenhouse gas emission is a big challenge facing today. The engine is the main power source in the transportation industry, and the emission of greenhouse gases is serious. Ammonia is widely considered as an alternative to future energy sources as a carbon-free fuel. And the mixing of ammonia gas in the natural gas engine can further reduce the emission of greenhouse gases on the basis of the natural gas engine. But the pure ammonia engine power is lower due to the slow combustion speed of the ammonia gas. In the related art, ammonia is cracked by using the temperature of tail gas, but the mixed gas generated after cracking is a gas component with a fixed proportion, and the switching between different fuels is difficult to realize. In addition, the related engine test equipment is difficult to simulate the mixed combustion of the cracked gas and the ammonia and the performance test of the mixed combustion of the cracked gas and the ammonia in different proportions, and is also difficult to detect the performance of the mixed combustion of the dual fuels in different proportions.
Based on the above, the embodiment of the invention provides a dual-fuel engine test system, which can realize switching of operation modes of various engines, can simulate cracked mixed gas with different proportions and ammonia and natural gas with different mixing ratios, and can realize performance test of the engines under different fuel conditions.
Referring to fig. 1, the dual-fuel engine test system provided by the embodiment of the invention comprises: a cracked gas simulation device, an ammonia gas generation device, a natural gas generation device, a fuel mixer 104, an electronic throttle valve 106, a fuel-air mixer 107 and an engine 108. Specifically, the cracked gas simulation device is used for simulating mixed gas with different proportions generated by ammonia cracking, namely providing cracked gas with a required proportion for the test system. The ammonia gas generating device is used for providing ammonia fuel for the test system. The natural gas generating device is used for providing required natural gas for the test system. Meanwhile, the fuel mixer 104 is provided with a first fuel input end and a first fuel output end. Wherein, the ammonia gas generating device and the natural gas generating device are both connected with the first fuel input end of the fuel mixer 104. When the engine operating mode is in the natural gas and ammonia gas mixed combustion mode, the ammonia gas output by the ammonia gas generator and the natural gas output by the natural gas generator are both input into the fuel mixer 104 to be fully mixed. In addition, the electronic throttle valve 106 is provided with an electronic throttle valve inlet end and an electronic throttle valve outlet end. Wherein, the air inlet end of the electronic throttle valve is connected with the cracked gas simulation device. Meanwhile, an air inlet, namely a fresh air inlet 114, is arranged on a connecting pipeline between the air inlet end of the electronic throttle valve and the cracked gas simulation device. The fuel-air mixer 107 is provided with a second fuel input, a third fuel input and a second fuel output. The second fuel input end is connected with the output end of the electronic throttle valve, and the third fuel input end is connected with the first fuel output end. Accordingly, the engine 108 is provided with an engine intake and an engine exhaust, the engine intake being connected to the second fuel output. The exhaust end of the engine is used for discharging exhaust gas generated by combustion. When the engine works in a pure ammonia plus cracked gas or hydrogen mode, the cracked gas or hydrogen with a corresponding proportion is output by controlling the cracked gas simulation device, the ammonia generating device is controlled to output the required ammonia amount, and the cracked gas or hydrogen, the ammonia and the air entering from the fresh air inlet 114 are mixed in the fuel air mixer 107 and then input into the engine 108 for combustion, so that the mixed combustion performance test of the cracked gas and the ammonia under different mixed gas proportions is realized. In addition, when the engine works in a pure natural gas mode, the ammonia gas generating device and the cracked gas simulating device are closed, and the natural gas generating device is opened. At this time, the fuel used in the system is only natural gas. The natural gas output from the natural gas generator is input to the fuel-air mixer 107 after passing through the fuel mixer 104. Further, the amount of air input from the fresh air inlet 114 is controlled by the electronic throttle 106 to provide sufficient oxygen for natural gas combustion. The natural gas and air are mixed in a fuel-air mixer 107 and then fed to an engine 108 for combustion.
In the working process of the above specific embodiment, the mixed combustion of ammonia and natural gas in different proportions and the mixed combustion of cracked gas and ammonia in different proportions are realized by controlling the output quantities of the cracked gas simulation device, the ammonia gas generation device and the natural gas generation device, and the switching of different fuel modes of the engine 108 is realized by changing the output quantities of the cracked gas simulation device, the ammonia gas generation device and the natural gas generation device, so that the corresponding engine performance test is performed in different fuel modes. Because the combustion speed of the pure ammonia is slow, the combustion efficiency is low, and combustion promoters such as pyrolysis gas or hydrogen are required to be added when the pure ammonia is combusted, so that the problems of slow combustion speed and low combustion efficiency of the pure ammonia are solved. When the working mode of the engine is a pure ammonia pyrolysis gas or hydrogen gas mode, the engine is adjusted to the idle working condition to run. At this time, the engine is unloaded or loaded less. Further, the cracked gas simulation device is opened, and the amount of the cracked gas and the total fuel are set according to a certain proportion according to the actual working condition of the engine 108 to be tested. Then, the output of the ammonia gas generator was controlled to be gradually increased. And when the idling working condition is stable in operation, gradually increasing the ammonia gas supply amount according to the working condition set by the console, so that the target test working condition is achieved, and the performance detection of the target test working condition is completed. When the working mode of the engine is a natural gas and ammonia mixed combustion mode, the natural gas output quantity of the natural gas generating device and the ammonia output quantity of the ammonia generating device are respectively controlled according to the testing working condition set by the console, and the engine stably runs after the mixing ratio of the set testing working condition is reached, so that the performance detection of the target testing working condition is realized. When the engine operating mode is a pure natural gas mode, the load is set by the console and the amount of fresh air input is controlled by the electronic throttle 106. Furthermore, the output quantity of the natural gas generating device is adjusted according to the fuel-air ratio required by the engine, and the supply of the natural gas is ensured, so that the performance detection of the target test working condition is realized.
Referring to fig. 1, in some embodiments of the invention, an ammonia gas generating apparatus comprises: liquid ammonia tank 102, ammonia mass flow meter 222, ammonia flow controller 232. Specifically, the liquid ammonia tank 102 is used to store liquid ammonia. The ammonia mass flow meter 222 is provided with a first ammonia inlet end and a first ammonia outlet end. Wherein, the first ammonia inlet end is connected with the liquid ammonia tank 102. Also, the ammonia flow controller 232 is provided with a second ammonia inlet port and a second ammonia outlet port. The second ammonia inlet end is connected to the first ammonia outlet end, and the second ammonia outlet end is connected to the first fuel inlet end of the fuel mixer 104. The ammonia amount output by the liquid ammonia tank 102 is detected by the ammonia mass flow meter, and the opening degree of the ammonia flow controller is adjusted according to the detected ammonia amount, so that the output ammonia amount is accurately controlled.
It is noted that, referring to fig. 1, in some embodiments of the present invention, the ammonia gas generator further includes an ammonia gas pressure reducing valve 201 and an ammonia pressure stabilizer 212. Specifically, the ammonia pressure reducing valve 201 is disposed on a connecting pipeline between the ammonia mass flow meter 222 and the liquid ammonia tank 102, and the ammonia stabilizer 212 is disposed between the ammonia pressure reducing valve 201 and the ammonia mass flow meter 222. When the liquid ammonia tank 102 is opened, the output ammonia gas flow is unstable due to the large air pressure difference between the inside and the outside of the liquid ammonia tank 102, and the detection of the ammonia mass flow meter on the ammonia mass flow is influenced. The ammonia gas output by the liquid ammonia tank 102 is decompressed through the ammonia gas decompression valve 201, and then the pressure of the ammonia gas flow is further stabilized at a certain pressure value through the ammonia pressure stabilizer 212, so that the stability and the reliability of the system are improved.
Referring to fig. 1, in some embodiments of the invention, a natural gas generating apparatus comprises: liquefied natural gas tank 101, natural gas mass flow meter 221, natural gas flow controller 231. Specifically, the liquefied natural gas tank 101 is used to store liquefied natural gas. The natural gas mass flow meter 221 is provided with a first natural gas inlet end and a first natural gas outlet end, wherein the first natural gas inlet end is connected with the liquefied natural gas tank 101. The natural gas flow controller 231 is provided with a second natural gas inlet end and a second natural gas outlet end, the second natural gas inlet end is connected with the first natural gas outlet end, and the second natural gas outlet end is connected with the first fuel input end of the fuel mixer 104. When the liquefied natural gas tank 101 is opened, the natural gas mass flow rate output by the liquefied natural gas tank 101 is detected through the natural gas mass flow meter 221, and the opening degree of the natural gas flow controller 231 is adjusted according to the detected natural gas mass flow rate value, so that the output quantity of the natural gas is accurately controlled.
It is noted that, with reference to fig. 1, in some embodiments of the present invention, the natural gas generation apparatus further comprises: a natural gas pressure reducing valve 202, a natural gas vaporizer 103, and a natural gas pressure stabilizer 211. Specifically, the natural gas pressure reducing valve 202 is provided on a connection pipe between the natural gas mass flow meter 221 and the liquefied natural gas tank 101, the natural gas pressure stabilizer 211 is provided between the natural gas pressure reducing valve 202 and the natural gas mass flow meter 221, and the natural gas vaporizer 103 is provided between the natural gas pressure reducing valve 202 and the natural gas pressure stabilizer 211. Due to the large pressure difference between the inside and the outside of the liquefied natural gas tank 101, when the liquefied natural gas tank 101 is opened, the output natural gas flow is unstable, and the detection of the natural gas mass flow rate by the natural gas mass flow meter 221 is influenced. The natural gas output from the lng tank 101 is depressurized by the natural gas depressurization valve 202, and then the lng output from the lng tank 101 is more completely vaporized by the natural gas vaporizer 103, thereby reducing the residual amount of the lng. Further, the natural gas pressure stabilizer stabilizes the natural gas airflow pressure at a certain pressure value, thereby improving the stability and reliability of the system.
Referring to fig. 1, in some embodiments of the invention, a cracked gas simulation apparatus comprises: cracked gas mixer 113, hydrogen tank 112, hydrogen mass flow controller 253, nitrogen tank 111, nitrogen mass flow controller 252, ammonia mass flow controller 251, and shut-off valve 110. Specifically, the cracked gas mixer 113 is provided with a cracked gas mixture inlet end and a cracked gas mixture outlet end. The hydrogen tank 112 is used to store hydrogen gas. The hydrogen mass flow controller 253 is provided with a first hydrogen inlet end and a first hydrogen outlet end. Wherein the first hydrogen inlet end is connected with the hydrogen tank 112, and the first hydrogen outlet end is connected with the pyrolysis gas mixing inlet end. The amount of hydrogen output from the hydrogen tank 112 is controlled by a hydrogen mass flow controller 253. In addition, the nitrogen gas tank 111 is used to store nitrogen gas. The nitrogen mass flow controller 252 is provided with a first nitrogen inlet end and a first nitrogen outlet end, wherein the first nitrogen inlet end is connected with the nitrogen tank 111, and the first nitrogen outlet end is connected with a pyrolysis gas mixing inlet end. The amount of nitrogen output from the nitrogen tank 111 is controlled more precisely by the nitrogen mass flow controller 252. Meanwhile, the ammonia mass flow controller 251 is provided with a third ammonia gas inlet end and a third ammonia gas outlet end. The third ammonia gas inlet end is connected to the pipeline connecting the first ammonia gas inlet end and the liquid ammonia tank 102 to form a second ammonia gas branch, and the third ammonia gas outlet end is connected with the pyrolysis gas mixing inlet end. The ammonia gas output quantity of the second ammonia gas branch is accurately controlled by the ammonia gas mass flow controller 251 of the second ammonia gas branch. Further, after inputting hydrogen, ammonia and nitrogen into the pyrolysis gas mixer 113 according to a required ratio and mixing them uniformly, pyrolysis gas of mixed gas with different ratios is simulated. In addition, a stop valve 110 is further arranged on the second ammonia branch, and the on-off state of the second ammonia branch is controlled by setting the on-off state of the stop valve 110. When the engine works in the ammonia and natural gas mixed combustion mode, the cracked gas simulation device is closed, the stop valve 110 on the second ammonia branch is closed, and the ammonia gas can only pass through the ammonia mass flow meter 222 and the ammonia flow controller 232 and finally enters the fuel mixer 104 to be mixed with the natural gas.
It should be noted that, referring to fig. 1, in some embodiments of the present invention, the cracked gas simulation apparatus further includes: a nitrogen pressure reducing valve 203 and a hydrogen pressure reducing valve 204. Specifically, the nitrogen pressure reducing valve 203 is provided between the nitrogen tank 111 and the nitrogen mass flow controller 252, and the difference in the pressure of the inside and the outside of the nitrogen tank 111 is relieved by the nitrogen pressure reducing valve 203, so that the flow of nitrogen gas output from the nitrogen tank 111 is maintained stable. The hydrogen pressure reducing valve 204 is disposed between the hydrogen tank 112 and the hydrogen mass flow controller 253, and the problem of excessive pressure of the hydrogen gas flow output from the hydrogen tank 112 is alleviated by the hydrogen pressure reducing valve 204.
Referring to fig. 1, in some embodiments of the present invention, the dual fuel engine test system provided by the present invention further comprises: a turbocharger 116, and an intercooler 105. Specifically, the turbocharger 116 is provided with a first turbine inlet end and a first turbine outlet end. The pyrolysis gas simulation device is connected with the first turbine air inlet end, and a fresh air inlet is formed in a pipeline connecting the pyrolysis gas simulation device and the first turbine air inlet end. Meanwhile, the intercooler 105 is provided with an intercooler water tank 109. Correspondingly, the intercooler is provided with an intercooling inlet end and an intercooling outlet end. The intercooling air inlet end is connected with the first turbine air outlet end, and the intercooling air outlet end is connected with the electronic throttle air inlet end. The high-temperature gas supercharged by the turbocharger is cooled by the intercooler 105, and the working efficiency of the engine is improved. Meanwhile, a pipeline connecting the first ammonia inlet end and the liquid ammonia tank 102 is arranged on the intercooling water tank 109, and liquid ammonia is vaporized through high-temperature cooling water in the intercooling water tank 109, so that small liquid drops do not exist in the ammonia gas. Meanwhile, in the heat exchange process, the ammonia gas cools the cooling water in the inter-cooling water tank 109, and the cooling water cools the engine 108 through the engine water path, so that the engine 108 operates normally. The ammonia gas is fully vaporized by preheating, the problem that ammonia droplets are mixed in the ammonia gas is solved, and the temperature of cooling water is reduced through the heat exchange process of the ammonia gas and the cooling water, so that the cooling water cools the engine 108, and the running temperature of the engine 108 is stable.
It should be noted that, in some embodiments of the present invention, in addition to using the waste heat of the intercooler water tank 109 to vaporize the liquid ammonia, the liquid ammonia may also be heated by electric heating or engine exhaust gas waste heat, so as to vaporize the liquid ammonia.
Referring to fig. 1, in some embodiments of the present invention, the turbocharger is further provided with a second turbine inlet end and a second turbine outlet end. Specifically, the inlet end of the second turbine is connected with the exhaust end of the engine, and the outlet end of the second turbine is used for discharging exhaust gas. The exhaust gas after combustion of the engine 108 is output to the inlet end of the second turbine through the exhaust end of the engine and is discharged from the outlet end of the second turbine.
It should be noted that, referring to fig. 1, in some embodiments of the present invention, the dual-fuel engine testing system further includes: a one-way valve. Specifically, the check valve includes: a first check valve 241, a second check valve 242, a third check valve 261, a fourth check valve 262, and a fifth check valve 263. The first check valve 241 is disposed between the natural gas flow controller 231 and the fuel mixer 104, the second check valve 242 is disposed between the ammonia flow controller 232 and the fuel mixer 104, the third check valve 261 is disposed between the ammonia gas mass flow controller 251 and the cracked gas mixer 113, the fourth check valve 262 is disposed between the nitrogen gas mass flow controller 252 and the cracked gas mixer 113, and the fifth check valve 263 is disposed between the hydrogen gas mass flow controller 253 and the cracked gas mixer 113. Through the setting of check valve for gas can only one-way through, has alleviated the problem of gas reflux.
It should be noted that, referring to fig. 1, in some embodiments of the present invention, the dual-fuel engine testing system further includes: an exhaust gas detection system 115, and an oxygen sensor 117. Specifically, the exhaust gas detection system 115 is disposed between the exhaust end of the engine and the intake end of the second turbine, and the exhaust gas detection system 115 detects and analyzes the exhaust gas of the engine 108. In addition, an oxygen sensor 117 is disposed at the outlet end of the second turbine, and detects the oxygen content at the outlet end of the second turbine.
It is noted that in some embodiments of the present invention, ammonia flow controller 232 or natural gas flow controller 231 comprises a butterfly valve, or other type of flow control device, such as a flow meter, etc.
Referring to fig. 2, the embodiment of the invention provides a dual-fuel engine test method, which can realize switching of operation modes of various engines, can simulate cracked mixed gas with different proportions and ammonia and natural gas with different mixing ratios, and can realize performance tests of the engines under different fuel conditions. The method of the embodiment of the present invention includes, but is not limited to, S310 and step S320.
Specifically, the process of the present embodiment applied to the dual-fuel engine test system as shown in fig. 1 includes the following steps:
s310: and acquiring the working mode of the engine. The engine working modes comprise a pure natural gas mode, a natural gas and ammonia mixed combustion mode and a pure ammonia pyrolysis gas or hydrogen mode.
S320: and adjusting the working states of the natural gas generating device, the cracked gas simulating device and the ammonia gas generating device according to the working mode of the engine.
Wherein, adjust natural gas generating device, pyrolysis gas analogue means and ammonia generating device operating condition, include but not limited to following step:
when the working mode of the engine is a pure natural gas mode, acquiring the load of the engine; determining the opening value of the electronic throttle valve according to the load, the rotating speed of the engine and the excess air coefficient, and correspondingly adjusting the opening value of the electronic throttle valve; acquiring the air pressure of the air outlet end of the electronic throttle valve, and calculating the fresh air quantity according to the air pressure; calculating an air-fuel ratio of the engine based on the fresh air amount; and adjusting the working state of the natural gas generating device according to the air-fuel ratio.
Or when the working mode of the engine is a natural gas and ammonia mixed combustion mode, acquiring a preset mixing ratio of natural gas and ammonia; and adjusting the working states of the natural gas generating device and the ammonia generating device according to the preset mixing ratio of the natural gas and the ammonia.
Or when the working mode of the engine is a pure ammonia pyrolysis gas or hydrogen gas mode, acquiring the preset working condition of the engine; controlling the engine to run under an idling working condition; setting a pyrolysis gas mass flow value according to a preset pyrolysis gas and fuel ratio according to a preset working condition; adjusting a natural gas generating device, a pyrolysis gas simulating device and an ammonia generating device according to a preset pyrolysis gas and fuel ratio and a pyrolysis gas mass flow value; and determining the idling working condition to run stably, and adjusting the ammonia gas generating device according to the preset working condition of the engine.
In the working process of the specific embodiment, firstly, the working mode of the engine is obtained through the console, and then the working states of the natural gas generating device, the cracked gas simulation device and the ammonia gas generating device are controlled according to the set working mode of the engine, so that the switching of the working modes of various engines is realized, ammonia gas cracked products at different temperatures are simulated, the running modes of the engine configured with cracked gases in different proportions are realized, the influence of the cracked gases in different proportions on the performance of the engine 108 is tested, meanwhile, the experimental research of different mixing ratios of ammonia gas and natural gas is realized, and the dynamic change condition of the mixed fuel is tested. Specifically, the operating modes of the engine include a pure natural gas mode, a natural gas and ammonia mixed combustion mode, and a pure ammonia plus cracked gas or hydrogen mode. Accordingly, when the engine operating mode is the pure natural gas mode, the load magnitude of the engine 108 is obtained by the console. Further, the engine controller determines the magnitude of the opening value of the electronic throttle valve 106 based on the magnitude of the engine load, the rotational speed, and the value of the excess air factor. Meanwhile, the air pressure of the air outlet end of the electronic throttle valve is obtained, the engine controller calculates the fresh air quantity according to the air pressure of the air outlet end of the electronic throttle valve, and further, the air-fuel ratio of the engine is calculated according to the fresh air quantity. And adjusting the working state of the natural gas generating device according to the air-fuel ratio of the engine, thereby realizing the operation of the engine in a pure natural gas mode. When the working mode of the engine is a natural gas and ammonia mixed combustion mode, a preset mixing ratio of natural gas and ammonia is obtained through the console. And adjusting the working states of the natural gas generating device and the ammonia generating device according to the preset mixing ratio of the natural gas and the ammonia. The natural gas and the ammonia gas are mixed in the fuel mixer 104 and then mixed with air in the fuel-air mixer, and then input into the engine 108 for combustion, so that the engine can run in a natural gas and ammonia gas mixed combustion mode. When the working mode of the engine is a pure ammonia pyrolysis gas or hydrogen mode, firstly, the preset working condition of the engine is obtained through a control console. And then controlling the engine 108 to run under an idling working condition, and setting a mass flow value of the cracked gas according to a preset ratio of the cracked gas to the fuel according to a preset working condition. And further, controlling the output quantities of the natural gas generating device, the cracked gas simulating device and the ammonia gas generating device according to the preset proportion of the cracked gas to the fuel and the mass flow value of the cracked gas. And after the stable operation of the current idling working condition is determined, adjusting the ammonia gas output quantity of the ammonia gas generating device according to the preset working condition of the engine set by the console, thereby achieving the target test working condition. Through the adjustment and the cooperation of the working states of the natural gas generating device, the cracked gas simulating device and the ammonia gas generating device, the switching of the running modes of various engines is realized, and cracked mixed gas with different proportions and ammonia and natural gas with different mixing ratios can be simulated, so that the performance test of the engines under different fuel conditions is realized.
It should be noted that, in some embodiments of the present invention, simulating the ammonia cracking products at different temperatures refers to the mixed products generated by the ammonia cracking reaction at different engine exhaust temperatures. When the engine operates under different working conditions, the temperature of the tail gas of the engine can be different, and the temperature of the tail gas of the engine can be changed within the range of about 250-450 ℃. At different temperatures, the concentration of the components of the mixture generated after the ammonia gas is subjected to cracking reaction is different. The reformate at different temperatures is configured to simulate ammonia cracking products at different temperatures. Namely: the method comprises the steps of obtaining the temperature of the exhaust gas of the engine through an experiment in the early stage, determining the concentration of each component in the ammonia cracking product at the temperature through an experiment, configuring different cracking gas components according to the concentration proportion, and finally introducing the components into the engine for combustion to simulate the ammonia cracking product at different temperatures, thereby testing the influence of the cracking gas with different proportions on the performance of the engine.
In some embodiments of the present invention, before the step of obtaining the engine operating mode is performed, the dual-fuel engine test method provided by the embodiments of the present invention further includes, but is not limited to, the steps of:
and controlling the natural gas generating device to be started, and closing the ammonia gas generating device and the cracked gas simulating device.
The method comprises the steps of controlling the engine to run under an idle working condition, enabling the engine to run under the idle working condition for a first preset time, enabling the temperature of cooling liquid of the engine to be larger than or equal to a first preset temperature, and enabling the temperature of engine oil of the engine to be larger than or equal to a second preset temperature.
During the operation of the above embodiment, it is difficult to start the engine at a cold time because the ammonia fuel has a slow combustion rate and a high ignition temperature. Thus, the test system was in pure natural gas mode at cold start. Specifically, the natural gas generation device is controlled to be started, and the ammonia gas generation device and the cracked gas simulation device are controlled to be closed. And further, controlling the engine to enter an idle working condition to operate, and when the engine operates in the idle working condition for a first preset time, the temperature of the cooling liquid of the engine is greater than or equal to a first preset temperature, and the temperature of the engine oil of the engine is greater than or equal to a second preset temperature, finishing the cold start of the engine. Illustratively, the liquid ammonia tank 102, the nitrogen tank 111, the hydrogen tank 112 are first closed, the liquefied natural gas tank 101 is opened, and the natural gas flow controller 231 is opened by 10%. And then, stabilizing the pressure of natural gas at 4bar through a natural gas pressure stabilizer 211, setting the rotating speed of the engine 108 at 850r/min, enabling the engine 108 to run at an idle speed, and completing cold start of the engine when the temperature of engine coolant is not lower than 60 ℃ and the temperature of engine oil is not lower than 45 ℃ after running for 5-10 min.
In some embodiments of the present invention, after the step of adjusting the operating states of the natural gas generator, the cracked gas simulator and the ammonia gas generator according to the operating mode of the engine is performed, the dual-fuel engine testing method provided by the embodiments of the present invention further includes, but is not limited to, the following steps:
and controlling the engine to run under an idle working condition.
Controlling the ammonia gas generating device to reduce the output of ammonia gas fuel, and controlling the natural gas generating device to increase the output of natural gas.
And determining that the engine runs for a second preset time period under the idle working condition, and controlling the engine to stop.
In the working process of the embodiment, the ammonia gas has certain corrosiveness to metal, and various sensitive detection devices are arranged in the engine. Therefore, the fuel needs to be gradually converted to pure natural gas between shutdowns to mitigate corrosion of the detection equipment within the engine 108 by ammonia residue. Specifically, the engine 108 is adjusted to an idle working condition to operate, then the ammonia gas generation device is controlled to reduce the output of ammonia gas fuel, the natural gas generation device is controlled to gradually increase the output of natural gas, and finally only one fuel of natural gas in the engine 108 is combusted. And controlling the engine 108 to stop after determining that the engine 108 operates under the idle working condition for a second preset time period. For example, after the engine 108 is operated at the idle condition for 3 to 5 minutes, the engine 108 is controlled to stop.
In some embodiments of the present invention, the adjusting the operating states of the natural gas generation device and the ammonia gas generation device according to the preset blending ratio of the natural gas and the ammonia gas includes, but is not limited to, the following steps:
and controlling the pressure of the ammonia gas output by the ammonia gas generating device and the pressure of the natural gas output by the natural gas generating device to be stabilized at a preset pressure value.
And according to the preset mixing ratio of the natural gas and the ammonia gas, carrying out first adjustment on the opening degree value of the ammonia flow controller and the opening degree value of the natural gas flow controller.
And acquiring natural gas mass flow data detected by the natural gas mass flow meter in real time and ammonia gas mass flow data detected by the ammonia mass flow meter in real time.
And secondly adjusting the opening degree value of the ammonia flow controller and the opening degree value of the natural gas flow controller according to the natural gas mass flow data and the ammonia gas mass flow data.
In the working process of the above embodiment, firstly, the pressure of the ammonia gas output by the ammonia gas generating device and the pressure of the natural gas output by the natural gas generating device are controlled to be stabilized at the preset pressure value. Then, according to a preset blending ratio of natural gas and ammonia gas, the opening degree value of the ammonia flow controller 232 and the opening degree value of the natural gas flow controller 231 are adjusted first. Further, the natural gas mass flow data detected by the natural gas mass flow meter 221 is acquired in real time, and meanwhile, the ammonia gas mass flow data detected by the ammonia mass flow meter 222 in real time is acquired in real time. And secondly adjusting the opening degree value of the ammonia flow controller 232 and the opening degree value of the natural gas flow controller 231 according to the natural gas mass flow data and the ammonia gas mass flow data, so that the mixing ratio of the natural gas and the ammonia gas reaches a preset mixing ratio and the natural gas and the ammonia gas stably run. Illustratively, the pressure of both fuels is first stabilized at 4bar by an ammonia potentiostat 212 and a natural gas potentiostat 211. At this time, the ammonia flow rate controller 232 is gradually opened, and the opening degree of the natural gas flow rate controller 231 is decreased. Further, to ensure that the engine power does not fluctuate too much, the opening rate of the ammonia flow controller 232 is 2.5 times the reduction rate of the natural gas flow controller 231. The readings of the natural gas mass flow meter 221 and the ammonia mass flow meter 222 are collected by the engine controller for calculation, the opening degrees of the ammonia flow controller 232 and the natural gas flow controller 231 are fed back and controlled by the engine controller according to the calculation result, and the engine controller takes the readings once every 0.1 second until the preset mixing proportion is reached and then stably operates.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the foregoing and various other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention.

Claims (10)

1. A dual fuel engine testing system, comprising:
the pyrolysis gas simulation device is used for simulating mixed gas with different proportions generated by ammonia pyrolysis;
an ammonia gas generation device for generating ammonia gas;
a natural gas generating device for generating natural gas;
the fuel mixer is provided with a first fuel input end and a first fuel output end, and the ammonia gas generating device and the natural gas generating device are both connected with the first fuel input end;
the electronic throttle valve is provided with an electronic throttle valve air inlet end and an electronic throttle valve air outlet end, the electronic throttle valve air inlet end is connected with the pyrolysis gas simulation device, and an air inlet is formed in a connecting pipeline of the electronic throttle valve air inlet end and the pyrolysis gas simulation device;
the fuel-air mixer is provided with a second fuel input end, a third fuel input end and a second fuel output end, the second fuel input end is connected with the air outlet end of the electronic throttle valve, and the third fuel input end is connected with the first fuel output end;
the engine is provided with an engine air inlet end and an engine exhaust end, the engine air inlet end is connected with the second fuel output end, and the engine exhaust end is used for discharging waste gas.
2. The dual fuel engine testing system of claim 1, wherein the ammonia gas generating device comprises:
a liquid ammonia tank for storing liquid ammonia;
the ammonia mass flow meter is provided with a first ammonia inlet end and a first ammonia outlet end, and the first ammonia inlet end is connected with the liquid ammonia tank;
the ammonia flow controller is provided with a second ammonia inlet end and a second ammonia outlet end, the second ammonia inlet end is connected with the first ammonia outlet end, and the second ammonia outlet end is connected with the first fuel input end of the fuel mixer.
3. The dual fuel engine testing system of claim 1, wherein the natural gas generating device comprises:
an LNG tank for storing LNG;
the natural gas mass flow meter is provided with a first natural gas inlet end and a first natural gas outlet end, and the first natural gas inlet end is connected with the liquefied natural gas tank;
the natural gas flow controller is provided with a second natural gas inlet end and a second natural gas outlet end, the second natural gas inlet end is connected with the first natural gas outlet end, the second natural gas outlet end is connected with the first fuel input end of the fuel mixer.
4. The dual fuel engine testing system of claim 2, wherein the cracked gas simulator comprises:
the pyrolysis gas mixer is provided with a pyrolysis gas mixed inlet end and a pyrolysis gas mixed outlet end;
a hydrogen tank for storing hydrogen;
the hydrogen mass flow controller is provided with a first hydrogen inlet end and a first hydrogen outlet end, the first hydrogen inlet end is connected with the hydrogen tank, and the first hydrogen outlet end is connected with the pyrolysis gas mixed inlet end;
the nitrogen tank is used for storing nitrogen;
the device comprises a nitrogen mass flow controller, a cracking gas mixing inlet end, a cracking gas mixing outlet end and a cracking gas mixing inlet end, wherein the nitrogen mass flow controller is provided with a first nitrogen inlet end and a first nitrogen outlet end;
the ammonia gas mass flow controller is provided with a third ammonia gas inlet end and a third ammonia gas outlet end, the third ammonia gas inlet end is connected to a pipeline connecting the first ammonia gas inlet end and the liquid ammonia tank to form a second ammonia gas branch, and the third ammonia gas outlet end is connected with the pyrolysis gas mixed inlet end;
and the stop valve is arranged on the second ammonia branch and is used for controlling the on-off state of the second ammonia branch.
5. The dual fuel engine testing system of claim 4, further comprising:
the device comprises a turbocharger, a pyrolysis gas simulation device and a fresh air inlet, wherein the turbocharger is provided with a first turbine air inlet end and a first turbine air outlet end, the pyrolysis gas simulation device is connected with the first turbine air inlet end, and a fresh air inlet is formed in a pipeline connecting the pyrolysis gas simulation device and the first turbine air inlet end;
the intercooler is provided with an intercooler water tank, the intercooler is provided with an intercooler air inlet end and an intercooler air outlet end, the intercooler air inlet end is connected with the first turbine air outlet end, the intercooler air outlet end is connected with the electronic throttle air inlet end, and the intercooler is used for cooling mixed gas output by the turbocharger; and the pipeline connecting the first ammonia inlet end and the liquid ammonia tank is arranged on the intercooling water tank.
6. The dual fuel engine testing system of claim 5, wherein the turbocharger is further provided with a second turbine inlet end and a second turbine outlet end, the second turbine inlet end being connected with the engine exhaust end, the second turbine outlet end being for discharging exhaust gases.
7. A dual fuel engine testing method, characterized in that the method comprises the steps of:
acquiring an engine working mode; the engine working modes comprise a pure natural gas mode, a natural gas and ammonia mixed combustion mode and a pure ammonia pyrolysis gas or hydrogen mode;
adjusting the working states of the natural gas generating device, the cracked gas simulating device and the ammonia gas generating device according to the working mode of the engine;
wherein, adjust natural gas generating device, pyrolysis gas analogue means and ammonia generating device operating condition, include:
when the working mode of the engine is a pure natural gas mode, acquiring the load of the engine; determining an opening value of the electronic throttle valve according to the load, the engine speed and the excess air coefficient, and correspondingly adjusting the opening value of the electronic throttle valve; acquiring the air pressure of an air outlet end of the electronic throttle valve, and calculating the fresh air quantity according to the air pressure; calculating an air-fuel ratio of the engine based on the fresh air amount; adjusting the working state of the natural gas generating device according to the air-fuel ratio;
or when the working mode of the engine is a natural gas and ammonia mixed combustion mode, acquiring a preset mixing ratio of natural gas and ammonia; adjusting the working states of the natural gas generating device and the ammonia generating device according to the preset mixing ratio of the natural gas and the ammonia;
or when the working mode of the engine is a pure ammonia pyrolysis gas or hydrogen gas mode, acquiring the preset working condition of the engine; controlling the engine to run under an idle working condition; according to the preset working condition, setting a pyrolysis gas mass flow value according to a preset pyrolysis gas and fuel ratio; adjusting the natural gas generating device, the cracked gas simulating device and the ammonia gas generating device according to the preset cracked gas and fuel ratio and the cracked gas mass flow value; and determining that the idling working condition is stable in operation, and adjusting the ammonia gas generating device according to the preset working condition of the engine.
8. The dual fuel engine testing method as claimed in claim 7, wherein before the step of obtaining the engine operating mode is performed, the method further comprises the steps of:
controlling the natural gas generating device to be started, and closing the ammonia gas generating device and the pyrolysis gas simulating device;
the method comprises the steps of controlling the engine to run under an idle working condition, enabling the engine to run under the idle working condition for a first preset time, enabling the temperature of cooling liquid of the engine to be larger than or equal to a first preset temperature, and enabling the temperature of engine oil of the engine to be larger than or equal to a second preset temperature.
9. The dual fuel engine test method as claimed in claim 7, wherein after performing the step of adjusting the operating states of the natural gas generating device, the cracked gas simulating device and the ammonia gas generating device according to the engine operating mode, the method further comprises the steps of:
controlling the engine to enter the idle working condition for operation;
controlling the ammonia gas generating device to reduce the output of ammonia gas fuel, and controlling the natural gas generating device to increase the output of natural gas;
and determining that the engine runs for a second preset time under the idling working condition, and controlling the engine to stop.
10. The dual-fuel engine test method of claim 7, wherein the adjusting the operating states of the natural gas generating device and the ammonia gas generating device according to the preset blending ratio of the natural gas and the ammonia gas comprises:
controlling the pressure of the ammonia gas output by the ammonia gas generating device and the pressure of the natural gas output by the natural gas generating device to be stabilized at a preset pressure value;
according to the preset mixing ratio of the natural gas and the ammonia gas, carrying out first adjustment on the opening degree value of the ammonia flow controller and the opening degree value of the natural gas flow controller;
acquiring natural gas mass flow data detected by a natural gas mass flow meter in real time and ammonia gas mass flow data detected by an ammonia mass flow meter in real time;
and secondly adjusting the opening degree value of the ammonia flow controller and the opening degree value of the natural gas flow controller according to the natural gas mass flow data and the ammonia gas mass flow data.
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