CN115172813A - Fuel cell ejector testing system and testing method thereof - Google Patents
Fuel cell ejector testing system and testing method thereof Download PDFInfo
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- CN115172813A CN115172813A CN202211009001.3A CN202211009001A CN115172813A CN 115172813 A CN115172813 A CN 115172813A CN 202211009001 A CN202211009001 A CN 202211009001A CN 115172813 A CN115172813 A CN 115172813A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04097—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with recycling of the reactants
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04104—Regulation of differential pressures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a fuel cell ejector testing system and a testing method thereof, which relate to the technical field of fuel cell testing equipment and comprise an ejector body, a hydrogen conveying pipeline, a first flowmeter, a galvanic pile consumption pipeline, a hydrogen return pipeline and a second flowmeter, wherein the ejector body is connected with the hydrogen conveying pipeline through the first flowmeter; the service behavior through the pile has preset the pile and has consumed the pipeline, and hydrogen supply flow and the hydrogen backward flow volume to the ejector body detect, through simulating out the gaseous state of fuel cell hydrogen gas circuit, make the gaseous true state that is closer to fuel cell hydrogen gas circuit of ejector body circulation more, make ejector performance test more accurate, the gas circuit state of the simulation fuel cell who has alleviated existence among the prior art can't be close to true service behavior, make the great technical problem of injection ratio deviation of testing out the ejector.
Description
Technical Field
The invention relates to the technical field of fuel cell testing equipment, in particular to a fuel cell ejector testing system and a testing method thereof.
Background
At present, with the rise of new energy, fuel cells are more and more emphasized, wherein proton exchange membrane fuel cells are widely applied in the fields of automobiles, aviation and the like. The fuel of the proton exchange membrane fuel cell is hydrogen, and in order to improve the utilization rate of the hydrogen, the hydrogen at the rear of the electric pile needs to be introduced into the front end of the electric pile. The ejector converts high-pressure hydrogen at the front end of the galvanic pile into high-speed hydrogen, and then ejects low-speed low-pressure hydrogen at the rear end of the galvanic pile to the inlet of the galvanic pile to finally form hydrogen circulation.
In the prior art, the ejector test mainly realizes the test of the refractive index (the ratio of the mass flow of the ejection fluid to the mass flow of the working fluid) under various working conditions by accurately controlling the outlet pressure of the ejector and the pressure of the ejection fluid; the existing ejector testing device basically simulates the state in a hydrogen fuel cell by adjusting the inlet and outlet pressure of an ejector through two proportional valves, and the ejector refractive index of the ejector is measured at each power point of the hydrogen fuel cell.
However, the prior art can not realize the simulation of the reaction gas components of the fuel cell for the simulation of the operation condition of the fuel cell; the gas circuit state of the simulated fuel cell can not be close to the real use condition, so that the gas circuit gas state can not be accurately simulated in the prior art, and the injection ratio deviation of the tested injector is large.
Disclosure of Invention
The invention aims to provide a fuel cell ejector testing system and a testing method thereof, which are used for solving the technical problem that the air path state of a simulated fuel cell in the prior art cannot be close to the real use condition, so that the ejector ratio deviation of a tested ejector is large.
The invention provides a fuel cell ejector testing system, which comprises: the system comprises an ejector body, a hydrogen conveying pipeline, a first flowmeter, a galvanic pile consumption pipeline, a hydrogen return pipeline and a second flowmeter;
the hydrogen conveying pipeline is communicated with the inlet end of the ejector body, the first flowmeter is positioned between the hydrogen conveying pipeline and the ejector body, and the first flowmeter is used for detecting the supply flow of the hydrogen entering the ejector body;
the reactor consumption pipeline and the hydrogen return pipeline are respectively communicated with the outlet end of the ejector body, a reactor consumption gas structure can be preset in the reactor consumption pipeline, the hydrogen return pipeline is communicated with the return end of the ejector body, the second flowmeter is located between the hydrogen return pipeline and the return end of the ejector body, and the second flowmeter is used for detecting the hydrogen return quantity which is consumed by the reactor consumption pipeline and enters the ejector body;
the ejector ratio of the ejector body under the hydrogen working condition is obtained through the first flowmeter and the second flowmeter, wherein the calculation formula of the ejector ratio of the ejector body under the hydrogen working condition is as follows: injection ratio = hydrogen reflux/hydrogen supply flow, unit is L/min.
In a preferred embodiment of the invention, the device further comprises a third flow meter, a nitrogen conveying pipeline and a first three-way valve;
the outlet end of the first three-way valve is communicated with the return end of the ejector body, the nitrogen conveying pipeline and the hydrogen return pipeline are respectively communicated with the two inlet ends of the first three-way valve, the third flowmeter is positioned between the nitrogen conveying pipeline and the first three-way valve, the third flowmeter is used for detecting the nitrogen supply flow entering the ejector body, and when the nitrogen conveying pipeline is opened, the second flowmeter is used for detecting the total gas return flow of the hydrogen and the nitrogen entering the ejector body;
the injection ratio of the ejector body under the hydrogen and nitrogen mixing working condition is obtained through the first flowmeter, the second flowmeter and the third flowmeter, wherein the injection ratio calculation formula of the ejector body under the hydrogen and nitrogen mixing working condition is as follows: injection ratio = total gas reflux/(hydrogen supply flow + nitrogen supply), unit is L/min.
In a preferred embodiment of the invention, the device further comprises a first pressure sensor and a second pressure sensor;
the first pressure sensor is positioned at the outlet end of the ejector body, the second pressure sensor is positioned between the first three-way valve and the ejector body, and a pressure drop formula of the ejector body is obtained through the first pressure sensor and the second pressure sensor: p Pressure drop ＝P First pressure sensor -P Second pressure sensor The unit is KPa.
In a preferred embodiment of the invention, the humidifier further comprises a humidifier and a second three-way valve;
the entry end of second three-way valve with first pressure sensor intercommunication, two exit ends of second three-way valve form first tributary pipeline and second tributary pipeline respectively, first tributary pipeline and second tributary pipeline are parallelly connected pipeline, the humidifier is located on the first tributary pipeline, first tributary pipeline and second tributary pipeline respectively with pile consumes the pipeline intercommunication, the second three-way valve is used for adjusting respectively opening and close of first tributary pipeline and second tributary pipeline, in order to adjust the humidifier with pile consumes the intercommunication or the closing of pipeline.
In a preferred embodiment of the invention, the pile consumption pipeline comprises a humidity sensor, a temperature sensor, a hand valve, a third pressure sensor, a third three-way valve and a gas recovery device;
the humidity sensor, the temperature sensor and the hand valve are sequentially communicated, the humidity sensor is communicated with a junction of the first branch pipeline and the second branch pipeline, the hand valve is communicated with an inlet end of the third three-way valve, the third pressure sensor is communicated with the hand valve, the third pressure sensor is used for detecting gas pressure information output by the hand valve, and a galvanic pile pressure drop is preset in the hand valve;
two outlet ends of the third three-way valve are respectively communicated with the gas recovery device and the hydrogen return pipeline, and the third three-way valve is preset with a galvanic pile consumption flow proportion so as to convey galvanic pile consumption gas to the gas recovery device.
In a preferred embodiment of the present invention, the stack consumption pipeline further includes a fourth flow meter, a fifth flow meter, a fourth pressure sensor, and a back pressure valve;
the fourth flowmeter is positioned at the inlet end of the hand valve and is used for detecting gas flow information before piling;
the fifth flowmeter is positioned at the inlet end of the gas recovery device and is used for detecting the gas flow information consumed by the galvanic pile;
the fourth pressure sensor and the back pressure valve are located between the third three-way valve and the gas recovery device, the back pressure valve can adjust the gas conveying pressure output by the third three-way valve, and the fourth pressure sensor is used for detecting the back pressure information of the back pressure valve.
In the preferred embodiment of the invention, the device also comprises a gas-liquid separator;
the gas-liquid separator is positioned on the hydrogen return pipeline.
In a preferred embodiment of the present invention, the hydrogen gas supply line includes: the high-pressure hydrogen gas cylinder, the first stop valve, the first reducing valve and the first proportional valve;
the high-pressure hydrogen cylinder is communicated with the inlet end of the ejector body sequentially through a first stop valve, a first reducing valve, a first proportional valve and the first flowmeter, and the first proportional valve is used for adjusting the hydrogen flow transmitted from the high-pressure hydrogen cylinder to the ejector body.
In a preferred embodiment of the present invention, the nitrogen gas delivery line includes: the nitrogen cylinder, a second stop valve, a second reducing valve and a second proportional valve;
the nitrogen cylinder sequentially passes through a second stop valve, a second pressure reducing valve, a second proportional valve, the second flowmeter and the first three-way valve to be communicated with the backflow end of the ejector body, and the second proportional valve is used for adjusting the nitrogen flow rate of the nitrogen cylinder to the ejector body.
The invention provides a testing method based on a fuel cell ejector testing system, which comprises the following working conditions:
under the working condition 1, a first stop valve, a first pressure reducing valve and a first proportional valve are sequentially opened, so that hydrogen in a high-pressure hydrogen cylinder is conveyed into an ejector body; opening the second branch pipeline, and closing the first branch pipeline and the nitrogen conveying pipeline; according to the test purpose, observing the numerical values of a first flowmeter, a second flowmeter, a fourth flowmeter, a fifth flowmeter, a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a humidity sensor and a temperature sensor; controlling the hydrogen conveying flow by a first proportional valve; the pressure drop of the whole pipeline is controlled by a hand valve and a back pressure valve; recording parameters of each node; calculating a parameter value of the ejector body according to the parameters;
under the working condition 2, the first stop valve, the first pressure reducing valve and the first proportional valve are sequentially opened, so that hydrogen in the high-pressure hydrogen cylinder is conveyed into the ejector body; opening the first branch pipeline, and closing the second branch pipeline and the nitrogen conveying pipeline; according to the test purpose, observing the numerical values of a first flowmeter, a second flowmeter, a fourth flowmeter, a fifth flowmeter, a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a humidity sensor and a temperature sensor; controlling the hydrogen conveying flow by a first proportional valve; controlling the gas temperature through a second three-way valve, and controlling the pressure drop of the whole pipeline through a hand valve and a back pressure valve; recording parameters of each node; calculating a parameter value of the ejector body according to the parameters;
under the working condition 3, the first stop valve, the first pressure reducing valve and the first proportional valve are sequentially opened, so that hydrogen in the high-pressure hydrogen cylinder is conveyed into the ejector body; opening the first branch pipeline and closing the second branch pipeline; according to the test purpose, observing the numerical values of a first flowmeter, a second flowmeter, a fourth flowmeter, a fifth flowmeter, a first pressure sensor, a second pressure sensor, a third pressure sensor, a fourth pressure sensor, a humidity sensor and a temperature sensor; controlling the hydrogen conveying flow by a first proportional valve; sequentially opening a second stop valve, a second reducing valve and a second proportional valve to convey nitrogen in the nitrogen bottle into the ejector body; observing the value of the third flowmeter; the opening degree of a second proportional valve is adjusted according to the feedback of the first flow meter, the second flow meter and the third flow meter so as to control the nitrogen conveying flow; the gas temperature is controlled through a second three-way valve, and the pressure drop of the whole pipeline is controlled through a hand valve and a back pressure valve; recording parameters of each node; and calculating the parameter value of the ejector body according to the parameters.
The invention provides a fuel cell ejector testing system, which comprises: the system comprises an ejector body, a hydrogen conveying pipeline, a first flowmeter, a galvanic pile consumption pipeline, a hydrogen return pipeline and a second flowmeter; the hydrogen conveying pipeline is communicated with the inlet end of the ejector body, the first flowmeter is positioned between the hydrogen conveying pipeline and the ejector body, and the first flowmeter is used for detecting the supply flow of hydrogen entering the ejector body; the fuel cell consumption pipeline and the hydrogen return pipeline are respectively communicated with the outlet end of the ejector body, a fuel cell consumption gas structure can be preset in the fuel cell consumption pipeline, the hydrogen return pipeline is communicated with the return end of the ejector body, the second flowmeter is positioned between the hydrogen return pipeline and the return end of the ejector body, and the second flowmeter is used for detecting the hydrogen return quantity which is consumed by the fuel cell consumption pipeline and enters the ejector body; the injection ratio of the injector body under the hydrogen working condition is obtained through the first flowmeter and the second flowmeter, wherein the injection ratio calculation formula of the injector body under the hydrogen working condition is as follows: injection ratio = hydrogen reflux/hydrogen supply flow, unit is L/min; the utility model discloses a fuel cell's injection ratio deviation is great, the fuel cell consumption pipeline has been preset to the in service behavior through the pile, and detect the hydrogen supply flow and the hydrogen backward flow volume of ejector body, through simulating out the gaseous state of fuel cell hydrogen gas circuit, make the gaseous true state that is closer to fuel cell hydrogen gas circuit of ejector body circulation, make ejector performance test more accurate, the simulation fuel cell's that has alleviated among the prior art gas circuit state can't be close to true in service behavior, make the great technical problem of injection ratio deviation that tests out the ejector.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of an overall structure of a fuel cell ejector testing system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an injector body of a fuel cell injector testing system according to an embodiment of the present invention;
fig. 3 is a flowchart of a fuel cell injector testing method according to an embodiment of the present invention.
Icon: 10-ejector body; 11-inlet end of ejector body; 12-the outlet end of the ejector body; 13-the return end of the ejector body; 20-a hydrogen gas delivery line; 21-high pressure hydrogen cylinder; 22-a first shut-off valve; 23-a first pressure relief valve; 24-a first proportional valve; 30-a first flow meter; 40-a galvanic pile consumption pipeline; 41-a humidity sensor; 42-a temperature sensor; 43-hand valve; 44-a third pressure sensor; 45-a third three-way valve; 46-a gas recovery unit; 47-a fourth flow meter; 48-a fifth flow meter; 49-a fourth pressure sensor; 410-back pressure valve; 50-a second flow meter; 60-a third flow meter; 70-nitrogen gas delivery line; 71-nitrogen gas cylinder; 72-a second stop valve; 73-a second pressure relief valve; 74-a second proportional valve; 80-a first three-way valve; 90-a first pressure sensor; 100-a second pressure sensor; 110-a humidifier; 120-a second three-way valve; 130-gas-liquid separator.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to fig. 3, the fuel cell injector testing system provided in this embodiment includes: the system comprises an ejector body 10, a hydrogen conveying pipeline 20, a first flow meter 30, a galvanic pile consumption pipeline 40, a hydrogen return pipeline and a second flow meter 50; the hydrogen conveying pipeline 20 is communicated with the inlet end 11 of the ejector body, the first flowmeter 30 is positioned between the hydrogen conveying pipeline 20 and the ejector body 10, and the first flowmeter 30 is used for detecting the supply flow of hydrogen entering the ejector body 10; the galvanic pile consumption pipeline 40 and the hydrogen return pipeline are respectively communicated with the outlet end 12 of the ejector body, a galvanic pile consumption gas structure can be preset in the galvanic pile consumption pipeline 40, the hydrogen return pipeline is communicated with the return end 13 of the ejector body, the second flowmeter 50 is located between the hydrogen return pipeline and the return end 13 of the ejector body, and the second flowmeter 50 is used for detecting the hydrogen return quantity which is consumed by the galvanic pile consumption pipeline 40 and enters the ejector body 10; the injection ratio of the injector body 10 under the hydrogen working condition is obtained through the first flowmeter 30 and the second flowmeter 50, wherein the injection ratio of the injector body 10 under the hydrogen working condition is calculated according to the formula: injection ratio = hydrogen reflux/hydrogen supply flow, unit is L/min.
It should be noted that, this embodiment is under the single operating mode to hydrogen transport, carry out flow monitoring to ejector body 10, specific parameter according to leaving factory to the galvanic pile sets for, utilize galvanic pile consumption pipeline 40 accurate simulation galvanic pile to the pressure drop and the consumption of hydrogen, the hydrogen that drops and consumes in the galvanic pile consumption pipeline 40 is gone back through hydrogen return line, carry the backward flow end 13 to the ejector body with the hydrogen after the backward flow, after lasting a section of operating time, obtain hydrogen supply flow after the stability according to first flowmeter 30, and obtain hydrogen backward flow volume after the stability according to second flowmeter 50, under this operating mode, obtain the injection ratio under the single hydrogen transport operating mode of ejector body 10, make this injection ratio more press close to the operating mode injection ratio that only has hydrogen transport in-process.
The fuel cell ejector testing system provided by the embodiment comprises: the system comprises an ejector body 10, a hydrogen conveying pipeline 20, a first flow meter 30, a galvanic pile consumption pipeline 40, a hydrogen return pipeline and a second flow meter 50; the hydrogen conveying pipeline 20 is communicated with the inlet end 11 of the ejector body, the first flow meter 30 is located between the hydrogen conveying pipeline 20 and the ejector body 10, and the first flow meter 30 is used for detecting the supply flow of hydrogen entering the ejector body 10; the galvanic pile consumption pipeline 40 and the hydrogen return pipeline are respectively communicated with the outlet end 12 of the ejector body, a galvanic pile consumption gas structure can be preset in the galvanic pile consumption pipeline 40, the hydrogen return pipeline is communicated with the return end 13 of the ejector body, the second flowmeter 50 is located between the hydrogen return pipeline and the return end 13 of the ejector body, and the second flowmeter 50 is used for detecting the hydrogen return flow which is consumed by the galvanic pile consumption pipeline 40 and enters the ejector body 10; the injection ratio of the injector body 10 under the hydrogen working condition is obtained through the first flowmeter 30 and the second flowmeter 50, wherein the injection ratio of the injector body 10 under the hydrogen working condition is calculated according to the formula: injection ratio = hydrogen reflux amount/hydrogen supply flow rate, unit is L/min; the service behavior through the pile has preset pile consumption pipeline 40, and detect the hydrogen supply flow and the hydrogen backward flow volume of ejector body 10, gaseous state through simulating out fuel cell hydrogen gas circuit, make the gaseous true state that is closer to fuel cell hydrogen gas circuit of ejector body 10 circulation more, make ejector body 10 capability test more accurate, the gas circuit state of the simulation fuel cell who has alleviated existence among the prior art can't press close to true service behavior, make the great technical problem of injection ratio deviation of testing out the ejector.
On the basis of the above embodiment, further, in a preferred embodiment of the present invention, the system further comprises a third flow meter 60, a nitrogen gas delivery pipeline 70 and a first three-way valve 80; the outlet end of the first three-way valve 80 is communicated with the return end 13 of the ejector body, the nitrogen conveying pipeline 70 and the hydrogen return pipeline are respectively communicated with two inlet ends of the first three-way valve 80, the third flow meter 60 is positioned between the nitrogen conveying pipeline 70 and the first three-way valve 80, the third flow meter 60 is used for detecting the nitrogen supply flow entering the ejector body 10, and when the nitrogen conveying pipeline 70 is opened, the second flow meter 50 is used for detecting the total gas return flow of the hydrogen and the nitrogen entering the ejector body 10; the injection ratio of the injector body 10 under the hydrogen and nitrogen mixing condition is obtained through the first flowmeter 30, the second flowmeter 50 and the third flowmeter 60, wherein the injection ratio of the injector body 10 under the hydrogen and nitrogen mixing condition is calculated according to the formula: injection ratio = total gas reflux/(hydrogen supply flow + nitrogen supply), unit is L/min.
In this embodiment, through introducing nitrogen, the injection ratio of the ejector is tested by using the mixture of hydrogen and nitrogen, specifically, the nitrogen conveying pipeline 70 may be communicated with the backflow end 13 of the ejector body through the first three-way valve 80, and the hydrogen backflow pipeline is also communicated with the backflow end 13 of the ejector body through the first three-way valve 80, at first, the stack consumption pipeline 40 is conveyed through the hydrogen conveying pipeline 20, at this time, after the hydrogen backflow pipeline forms a passage, the nitrogen conveying pipeline 70 is opened to convey nitrogen to the ejector body 10, so that a mixed gas of nitrogen, hydrogen conveying and hydrogen backflow is formed inside the ejector body 10, after pressure drop and consumption of the mixed gas in the stack consumption pipeline 40 are performed, after the first flowmeter 30, the second flowmeter 50 and the third flowmeter 60 reach stability, under this working condition, the injection ratio under the mixed gas conveying working condition of hydrogen and nitrogen of the ejector body 10 is obtained, so that the injection ratio is closer to the injection ratio in the mixed gas conveying process of hydrogen and nitrogen only.
Optionally, the first three-way valve 80, the second three-way valve 120 and the third three-way valve 45 described below may both adopt electromagnetic three-way valves, and the opening degree of the electromagnetic three-way valves may be preset according to preset working conditions, so that it can be ensured that nitrogen and hydrogen backflow can completely enter the ejector body 10.
In the preferred embodiment of the present invention, a first pressure sensor 90 and a second pressure sensor 100 are also included; a first pressure sensor 90 is located at the outlet end 12 of the eductor body and a second pressure sensor 100 is located at the first three-way valve 80 and the pilotBetween the ejector bodies 10, a pressure drop formula of the ejector body 10 is obtained through the first pressure sensor 90 and the second pressure sensor 100: p Pressure drop ＝P First pressure sensor 90 -P Second pressure sensor 100 The unit is KPa.
In this embodiment, first pressure sensor 90 and second pressure sensor 100 have been arranged respectively through exit end 12 and the backward flow end at the ejector body, wherein, first pressure sensor 90 can detect the gas pressure numerical value through 12 outputs of exit end of ejector body, second pressure sensor 100 can detect the gas pressure numerical value after 40 pressure drops of consumption pipeline of galvanic pile and the pipeline pressure drop, no matter be under the single transport operating mode of hydrogen or nitrogen and hydrogen gas mixture transport operating mode, after first pressure sensor 90 and second pressure sensor 100 reach stable back, can obtain the whole pressure drop information down of ejector body 10 through calculating.
Alternatively, the first pressure sensor 90, the second pressure sensor 100, and the third pressure sensor 44 and the fourth pressure sensor 49 described below may each have a numerical display, so that the pressure information at each position can be recorded and calculated for different operating conditions.
In a preferred embodiment of the present invention, the humidifier further comprises a humidifier 110 and a second three-way valve 120; the inlet end of the second three-way valve 120 is communicated with the first pressure sensor 90, two outlet ends of the second three-way valve 120 respectively form a first branch pipeline and a second branch pipeline, the first branch pipeline and the second branch pipeline are parallel pipelines, the humidifier 110 is located on the first branch pipeline, the first branch pipeline and the second branch pipeline are respectively communicated with the galvanic pile consumption pipeline 40, and the second three-way valve 120 is used for respectively adjusting the opening and closing of the first branch pipeline and the second branch pipeline so as to adjust the communication or closing of the humidifier 110 and the galvanic pile consumption pipeline 40.
In this embodiment, the humidifier 110 can ensure the gas entering the stack consumption pipeline 40 to humidify, specifically, the outlet end of the injector body 10 is conveyed by the second three-way valve 120, the second three-way valve 120 has two outlet ends, and the two outlet ends form a first branch pipeline and a second branch pipeline respectively, wherein the second branch pipeline directly forms a passage between the injector body 10 and the stack consumption pipeline 40, the humidifier 110 is located on the first branch pipeline, that is, the opening and closing of different outlet ends are controlled by the second three-way valve 120, so as to adjust whether the gas entering the stack consumption pipeline 40 needs to be humidified, according to different test purposes, when the injector body 10 needs to be tested by pure hydrogen, the first branch pipeline is in a closed state, the second branch pipeline is in an open state, that is, that the pure hydrogen conveyed by the hydrogen conveying pipeline 20 can be directly conveyed into the stack consumption pipeline 40 by the second branch pipeline, and then the hydrogen return pipeline also receives the return flow of the pure hydrogen; when the ejector body 10 is tested by humidifying hydrogen, the first branch pipeline is in an open state, the second branch pipeline is in a closed state, namely pure hydrogen conveyed by the hydrogen conveying pipeline 20 can be humidified by the humidifier 110 and then conveyed to the galvanic pile consumption pipeline 40, and then the hydrogen return pipeline also receives the humidified return flow; when the ejector body 10 needs to be humidified for the mixed gas of hydrogen and nitrogen, the first branch pipeline is in an open state, the second branch pipeline is in a closed state, namely, the mixed gas of pure hydrogen and pure nitrogen conveyed by the pure hydrogen and the pure nitrogen conveyed by the hydrogen conveying pipeline 20 can be humidified by the humidifier 110 and then conveyed to the galvanic pile consumption pipeline 40, and then the hydrogen return pipeline also receives the humidified return flow.
In a preferred embodiment of the present invention, the stack consumption line 40 includes a humidity sensor 41, a temperature sensor 42, a hand valve 43, a third pressure sensor 44, a third three-way valve 45, and a gas recovery device 46; the humidity sensor 41, the temperature sensor 42 and the hand valve 43 are sequentially communicated, the humidity sensor 41 is communicated with a junction of the first branch pipeline and the second branch pipeline, the hand valve 43 is communicated with an inlet end of a third three-way valve 45, a third pressure sensor 44 is communicated with the hand valve 43, the third pressure sensor 44 is used for detecting gas pressure information output by the hand valve 43, and the hand valve 43 is preset with a galvanic pile pressure drop; two outlet ends of the third three-way valve 45 are respectively communicated with the gas recovery device 46 and the hydrogen return pipeline, and the third three-way valve 45 is preset with a galvanic pile consumption flow ratio so as to convey galvanic pile consumption gas to the gas recovery device 46.
In this embodiment, the hand valve 43 can be manually controlled according to the specific specification of the stack, that is, the hand valve 43 can perform quantitative pressure drop on the delivered gas, so as to simulate the pressure drop of the gas entering the stack, wherein the third pressure sensor 44 can detect the gas pressure after the pressure drop is performed by the hand valve 43, that is, the value of the first pressure sensor 90 subtracts the value of the third pressure sensor 44, so as to obtain the specific pressure drop value of the hand valve 43, and thus obtain the gas value simulating the stack consumption pressure drop by the hand valve 43, in addition, the value of the third pressure sensor 44 can assist the operator to adjust the pressure drop value of the hand valve 43, so as to perform tests under different working conditions on the pressure drops of the stacks with different test purposes; further, the third three-way valve 45 can simulate the consumption of the galvanic pile to gas, namely, two outlet ends with different opening degrees are arranged in the third three-way valve 45, the third three-way valve 45 is connected with the gas recovery device 46 in a passage, the flow consumed by the galvanic pile gas can be conveyed, the third three-way valve 45 is connected with a hydrogen return pipeline in the passage, the residual gas can be returned through the hydrogen return pipeline, the pressure drop and the flow consumption of the galvanic pile to the gas can be completely simulated through the hand valve 43 and the third three-way valve 45, and then the simulation test of the ejector body 10 is closer to the specific use condition, so that the gas conveying is closer to the real gas state of the hydrogen pipeline of the fuel cell, the performance test of the ejector body 10 is more accurate, and the time and the fund for the system test of the ejector body 10 are saved.
Further, the humidity sensor 41 and the temperature sensor 42 can detect the humidity and the temperature of the gas before stacking, and at the moment, the values detected by the humidity sensor 41 and the temperature sensor 42 are recorded, so that the test result of the ejector body 10 in the specific humidity and temperature value range can be obtained.
In the preferred embodiment of the present invention, the stack drain line 40 further includes a fourth flow meter 47, a fifth flow meter 48, a fourth pressure sensor 49, and a backpressure valve 410; a fourth flow meter 47 is positioned at the inlet end of the hand valve 43, and the fourth flow meter 47 is used for detecting gas flow information before piling; a fifth flow meter 48 is positioned at the inlet end of the gas recovery device 46, and the fifth flow meter 48 is used for detecting the gas flow information consumed by the galvanic pile; a fourth pressure sensor 49 and a backpressure valve 410 are located between the third three-way valve 45 and the gas recovery device 46, the backpressure valve 410 being capable of regulating the gas delivery pressure output through the third three-way valve 45, the fourth pressure sensor 49 being used to detect backpressure information of the backpressure valve 410.
In this embodiment, the fourth flow meter 47 can measure all gas flows before entering the reactor, and the fifth flow meter 48 is located at the inlet end of the gas recovery device 46, that is, the detected flow information of the fifth flow meter 48 should be a preset gas flow value consumed by the reactor, so that it is determined by the fifth flow meter 48 whether the opening of the third three-way valve 45 meets the requirement of gas consumption by the reactor, and the opening of the third three-way valve 45 can be timely adjusted according to the value of the fifth flow meter 48; further, the backpressure valve 410 can control the pressure range of the third three-way valve 45 to the gas recovery device 46, and the backpressure of the backpressure valve 410 is observed through the fourth pressure sensor 49, so that the pressure of the backpressure valve 410 can be adjusted in time according to different test working conditions.
In the preferred embodiment of the present invention, a gas-liquid separator 130 is further included; the gas-liquid separator 130 is located on the hydrogen return line.
In this embodiment, the fuel cell performs gas-liquid separation on the return gas through the gas-liquid separator 130 on the hydrogen return line, so as to ensure that the gas entering the injector body 10 is dry, that is, the actual operation process of the fuel cell can be completely simulated by using the gas-liquid separator 130 on the hydrogen return line; alternatively, a water tank may be connected to the gas-liquid separator 130 to discharge the water flow in the gas-liquid separator 130.
In the preferred embodiment of the present invention, the hydrogen gas supply line 20 includes: a high-pressure hydrogen cylinder 21, a first cut valve 22, a first pressure reducing valve 23, and a first proportional valve 24; the high-pressure hydrogen cylinder 21 is communicated with the inlet end 11 of the ejector body sequentially through a first stop valve 22, a first reducing valve 23, a first proportional valve 24 and a first flow meter 30, and the first proportional valve 24 is used for adjusting the hydrogen flow transmitted from the high-pressure hydrogen cylinder 21 to the ejector body 10.
In this embodiment, the first stop valve 22 can adjust opening and closing of the high-pressure hydrogen cylinder 21, the first pressure reducing valve 23 can reduce pressure of hydrogen output from the high-pressure hydrogen cylinder 21, and the first proportional valve 24 can adjust flow rate of hydrogen output from the high-pressure hydrogen cylinder 21, wherein the first proportional valve 24 can specifically adjust according to different test conditions, and further record specific performance of the injector body 10 under different hydrogen flow rates.
In the preferred embodiment of the present invention, the nitrogen gas supply line 70 includes: a nitrogen gas cylinder 71, a second shutoff valve 72, a second pressure reducing valve 73, and a second proportional valve 74; the nitrogen cylinder 71 is communicated with the backflow end 13 of the ejector body sequentially through a second stop valve 72, a second reducing valve 73, a second proportional valve 74, a second flow meter 50 and a first three-way valve 80, and the second proportional valve 74 is used for adjusting the flow rate of nitrogen gas transmitted from the nitrogen cylinder 71 to the ejector body 10.
In this embodiment, the opening and closing of nitrogen cylinder 71 can be adjusted to second stop valve 72, and second relief pressure valve 73 can decompress the nitrogen gas of output in the nitrogen cylinder 71, and the flow of nitrogen gas cylinder 71 output nitrogen gas can be adjusted to second proportional valve 74, and wherein second proportional valve 74 can carry out concrete regulation under the test condition according to the difference, and then the concrete performance of ejector body 10 under the mixture of different hydrogen and nitrogen gas proportion of record.
The testing method based on the fuel cell ejector testing system provided by the embodiment comprises the following working conditions:
under the working condition 1, the first stop valve 22, the first reducing valve 23 and the first proportional valve 24 are sequentially opened, so that hydrogen in the high-pressure hydrogen cylinder 21 is conveyed into the ejector body 10; opening the second branch line, closing the first branch line and the nitrogen gas delivery line 70; observing the values of the first flow meter 30, the second flow meter 50, the fourth flow meter 47, the fifth flow meter 48, the first pressure sensor 90, the second pressure sensor 100, the third pressure sensor 44, the fourth pressure sensor 49, the humidity sensor 41 and the temperature sensor 42 according to the test purpose; the hydrogen delivery flow rate is controlled by the first proportional valve 24; the pressure drop of the whole pipeline is controlled by the hand valve 43 and the backpressure valve 410; recording parameters of each node; calculating the parameter value of the injector body 10 according to the parameters;
under the working condition 2, the first stop valve 22, the first reducing valve 23 and the first proportional valve 24 are sequentially opened, so that hydrogen in the high-pressure hydrogen cylinder 21 is conveyed into the ejector body 10; opening the first branch line, closing the second branch line and the nitrogen gas delivery line 70; observing values of the first flow meter 30, the second flow meter 50, the fourth flow meter 47, the fifth flow meter 48, the first pressure sensor 90, the second pressure sensor 100, the third pressure sensor 44, the fourth pressure sensor 49, the humidity sensor 41, and the temperature sensor 42 according to the test purpose; the hydrogen delivery flow rate is controlled by the first proportional valve 24; the gas temperature is controlled by the second three-way valve 120, and the pressure drop of the whole pipeline is controlled by the hand valve 43 and the backpressure valve 410; recording parameters of each node; calculating the parameter value of the injector body 10 according to the parameters;
under the working condition 3, the first stop valve 22, the first reducing valve 23 and the first proportional valve 24 are sequentially opened, so that hydrogen in the high-pressure hydrogen cylinder 21 is conveyed into the ejector body 10; opening the first branch pipeline and closing the second branch pipeline; observing the values of the first flow meter 30, the second flow meter 50, the fourth flow meter 47, the fifth flow meter 48, the first pressure sensor 90, the second pressure sensor 100, the third pressure sensor 44, the fourth pressure sensor 49, the humidity sensor 41 and the temperature sensor 42 according to the test purpose; the hydrogen delivery flow rate is controlled by the first proportional valve 24; the second stop valve 72, the second reducing valve 73 and the second proportional valve 74 are sequentially opened, so that the nitrogen in the nitrogen cylinder 71 is conveyed into the ejector body 10; observing the value of the third flow meter 60; the opening degree of the second proportional valve 74 is adjusted in accordance with the feedback of the first, second, and third flow meters 30, 50, and 60 to control the nitrogen delivery flow rate; the gas temperature is controlled by the second three-way valve 120, and the pressure drop of the whole pipeline is controlled by the hand valve 43 and the backpressure valve 410; recording parameters of each node; and calculating the parameter value of the injector body 10 according to the parameters.
As shown in fig. 1 to fig. 3, the testing method of the fuel cell injector provided in this embodiment provides three testing methods for the injector body 10 under different working conditions, and the performance of the injector body 10 under different gas flows is respectively measured under three different working conditions, specifically, the working condition 1 is to test using pure hydrogen, the working condition 2 is to test humidified hydrogen, the working condition 3 is to test the humidification of a mixed gas of nitrogen and hydrogen, and the different gas flows and different pressure drops can be tested by adjusting a control valve under each working condition, so that the testing method of the injector body 10 is realized comprehensively, and by simulating the gas states of the fuel cell hydrogen under different working conditions, the gas flowing through the injector body 10 is closer to the real gas path state of the fuel cell, so that the performance test of the injector body 10 is more accurate, and the technical problem that the gas path state of the fuel cell cannot be really used when the fuel cell is simulated in the prior art is simulated is alleviated, so that the injection ratio deviation of the injector is large is tested.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A fuel cell injector test system, comprising: the system comprises an ejector body (10), a hydrogen conveying pipeline (20), a first flow meter (30), a galvanic pile consumption pipeline (40), a hydrogen return pipeline and a second flow meter (50);
the hydrogen conveying pipeline (20) is communicated with the inlet end (11) of the ejector body, the first flow meter (30) is located between the hydrogen conveying pipeline (20) and the ejector body (10), and the first flow meter (30) is used for detecting the supply flow of hydrogen entering the ejector body (10);
the galvanic pile consumption pipeline (40) and the hydrogen return pipeline are respectively communicated with the outlet end (12) of the ejector body, a galvanic pile consumption gas structure can be preset in the galvanic pile consumption pipeline (40), the hydrogen return pipeline is communicated with the return end (13) of the ejector body, the second flowmeter (50) is positioned between the hydrogen return pipeline and the return end (13) of the ejector body, and the second flowmeter (50) is used for detecting the hydrogen return quantity which is consumed by the galvanic pile consumption pipeline (40) and enters the ejector body (10);
the injection ratio of the ejector body (10) under the hydrogen working condition is obtained through a first flow meter (30) and a second flow meter (50), wherein the injection ratio of the ejector body (10) under the hydrogen working condition is calculated according to the formula: injection ratio = hydrogen reflux/hydrogen supply flow, unit is L/min.
2. The fuel cell injector testing system of claim 1, further comprising a third flow meter (60), a nitrogen delivery line (70), and a first three-way valve (80);
the outlet end of the first three-way valve (80) is communicated with the backflow end (13) of the ejector body, the nitrogen conveying pipeline (70) and the hydrogen backflow pipeline are respectively communicated with two inlet ends of the first three-way valve (80), the third flow meter (60) is located between the nitrogen conveying pipeline (70) and the first three-way valve (80), the third flow meter (60) is used for detecting the supply flow of nitrogen entering the ejector body (10), and when the nitrogen conveying pipeline (70) is opened, the second flow meter (50) is used for detecting the total gas backflow amount of the hydrogen and the nitrogen entering the ejector body (10);
the injection ratio of the ejector body (10) under the hydrogen and nitrogen mixing condition is obtained through a first flow meter (30), a second flow meter (50) and a third flow meter (60), wherein the injection ratio of the ejector body (10) under the hydrogen and nitrogen mixing condition is calculated according to the formula: injection ratio = total gas reflux/(hydrogen supply flow + nitrogen supply), unit is L/min.
3. The fuel cell injector testing system of claim 2, further comprising a first pressure sensor (90) and a second pressure sensor (100);
the first pressure sensor (90) is located at the outlet end (12) of the ejector body, the second pressure sensor (100) is located between the first three-way valve (80) and the ejector body (10), and a pressure drop formula of the ejector body (10) is obtained through the first pressure sensor (90) and the second pressure sensor (100): p Pressure drop ＝P First pressure sensor (90) -P Second pressure sensor (100) The unit is KPa.
4. The fuel cell ejector testing system of claim 3, further comprising a humidifier (110) and a second three-way valve (120);
the entry end of second three-way valve (120) with first pressure sensor (90) intercommunication, two exit ends of second three-way valve (120) form first branch pipeline and second branch pipeline respectively, first branch pipeline and second branch pipeline are parallel line, humidifier (110) are located on the first branch pipeline, first branch pipeline and second branch pipeline respectively with pile consumes pipeline (40) intercommunication, second three-way valve (120) are used for adjusting respectively opening and close of first branch pipeline and second branch pipeline, in order to adjust humidifier (110) with pile consumes the intercommunication or closing of pipeline (40).
5. The fuel cell injector test system according to claim 4, wherein the stack drain line (40) includes a humidity sensor (41), a temperature sensor (42), a hand valve (43), a third pressure sensor (44), a third three-way valve (45), and a gas recovery device (46);
the humidity sensor (41), the temperature sensor (42) and the hand valve (43) are sequentially communicated, the humidity sensor (41) is communicated with a junction of the first branch pipeline and the second branch pipeline, the hand valve (43) is communicated with an inlet end of a third three-way valve (45), the third pressure sensor (44) is communicated with the hand valve (43), the third pressure sensor (44) is used for detecting gas pressure information output by the hand valve (43), and a stack pressure drop is preset in the hand valve (43);
two outlet ends of the third three-way valve (45) are respectively communicated with the gas recovery device (46) and the hydrogen return pipeline, and the third three-way valve (45) is preset with a galvanic pile consumption flow proportion so as to convey galvanic pile consumption gas to the gas recovery device (46).
6. The fuel cell injector test system of claim 5, wherein the stack drain line (40) further comprises a fourth flow meter (47), a fifth flow meter (48), a fourth pressure sensor (49), and a backpressure valve (410);
the fourth flow meter (47) is positioned at the inlet end of the hand valve (43), and the fourth flow meter (47) is used for detecting gas flow information before stacking;
the fifth flowmeter (48) is positioned at the inlet end of the gas recovery device (46), and the fifth flowmeter (48) is used for detecting the gas flow information consumed by the galvanic pile;
the fourth pressure sensor (49) and the back pressure valve (410) are located between the third three-way valve (45) and the gas recovery device (46), the back pressure valve (410) is capable of adjusting a gas delivery pressure output through the third three-way valve (45), and the fourth pressure sensor (49) is used for detecting back pressure information of the back pressure valve (410).
7. The fuel cell injector testing system according to any one of claims 1-6, further comprising a gas-liquid separator (130);
the gas-liquid separator (130) is located on the hydrogen return line.
8. The fuel cell injector testing system according to any one of claims 1-6, wherein the hydrogen gas delivery line (20) comprises: a high-pressure hydrogen cylinder (21), a first stop valve (22), a first pressure reducing valve (23), and a first proportional valve (24);
the high-pressure hydrogen cylinder (21) is communicated with the inlet end (11) of the ejector body sequentially through a first stop valve (22), a first reducing valve (23), a first proportional valve (24) and the first flow meter (30), and the first proportional valve (24) is used for adjusting the hydrogen flow transmitted from the high-pressure hydrogen cylinder (21) to the ejector body (10).
9. The fuel cell injector testing system according to any one of claims 2-6, wherein the nitrogen gas delivery line (70) comprises: a nitrogen gas cylinder (71), a second stop valve (72), a second reducing valve (73) and a second proportional valve (74);
the nitrogen gas bottle (71) sequentially passes through a second stop valve (72), a second reducing valve (73), a second proportional valve (74), the second flow meter (50) and the first three-way valve (80) to be communicated with the backflow end (13) of the ejector body, and the second proportional valve (74) is used for adjusting the nitrogen flow transmitted from the nitrogen gas bottle (71) to the ejector body (10).
10. A method of testing a fuel cell injector testing system according to any one of claims 1 to 9, comprising the following operating conditions:
under the working condition 1, a first stop valve (22), a first reducing valve (23) and a first proportional valve (24) are sequentially opened, so that hydrogen in a high-pressure hydrogen cylinder (21) is conveyed into an ejector body (10); opening the second branch pipeline, and closing the first branch pipeline and the nitrogen gas conveying pipeline (70); observing values of a first flowmeter (30), a second flowmeter (50), a fourth flowmeter (47), a fifth flowmeter (48), a first pressure sensor (90), a second pressure sensor (100), a third pressure sensor (44), a fourth pressure sensor (49), a humidity sensor (41) and a temperature sensor (42) according to a test purpose; controlling the hydrogen delivery flow rate by means of a first proportional valve (24); the pressure drop of the whole pipeline is controlled by a hand valve (43) and a back pressure valve (410); recording parameters of each node; calculating the parameter value of the ejector body (10) according to the parameters;
under the working condition 2, the first stop valve (22), the first reducing valve (23) and the first proportional valve (24) are sequentially opened, so that hydrogen in the high-pressure hydrogen cylinder (21) is conveyed into the ejector body (10); opening the first branch pipeline, closing the second branch pipeline and the nitrogen gas conveying pipeline (70); observing values of a first flowmeter (30), a second flowmeter (50), a fourth flowmeter (47), a fifth flowmeter (48), a first pressure sensor (90), a second pressure sensor (100), a third pressure sensor (44), a fourth pressure sensor (49), a humidity sensor (41) and a temperature sensor (42) according to a test purpose; controlling the hydrogen delivery flow rate by means of a first proportional valve (24); the gas temperature is controlled by a second three-way valve (120), and the pressure drop of the whole pipeline is controlled by a hand valve (43) and a back pressure valve (410); recording parameters of each node; calculating the parameter value of the injector body (10) according to the parameters;
under the working condition 3, the first stop valve (22), the first reducing valve (23) and the first proportional valve (24) are sequentially opened, so that hydrogen in the high-pressure hydrogen cylinder (21) is conveyed into the ejector body (10); opening the first branch pipeline and closing the second branch pipeline; observing values of a first flowmeter (30), a second flowmeter (50), a fourth flowmeter (47), a fifth flowmeter (48), a first pressure sensor (90), a second pressure sensor (100), a third pressure sensor (44), a fourth pressure sensor (49), a humidity sensor (41) and a temperature sensor (42) according to a test purpose; controlling the hydrogen delivery flow rate by means of a first proportional valve (24); a second stop valve (72), a second reducing valve (73) and a second proportional valve (74) are opened in sequence, so that nitrogen in the nitrogen cylinder (71) is conveyed into the ejector body (10); observing the value of the third flow meter (60); adjusting the opening degree of a second proportional valve (74) according to the feedback of the first flow meter (30), the second flow meter (50) and the third flow meter (60) to control the nitrogen gas delivery flow rate; the gas temperature is controlled by a second three-way valve (120), and the pressure drop of the whole pipeline is controlled by a hand valve (43) and a back pressure valve (410); recording parameters of each node; and calculating the parameter value of the ejector body (10) according to the parameters.
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| CN202211009001.3A CN115172813A (en) | 2022-08-22 | 2022-08-22 | Fuel cell ejector testing system and testing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116666705A (en) * | 2023-05-23 | 2023-08-29 | 武汉理工大学 | Method and system for adjusting hydrogen reflux quantity of fuel cell hydrogen ejector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116666705A (en) * | 2023-05-23 | 2023-08-29 | 武汉理工大学 | Method and system for adjusting hydrogen reflux quantity of fuel cell hydrogen ejector |
| CN116666705B (en) * | 2023-05-23 | 2024-02-02 | 武汉理工大学 | Method and system for adjusting hydrogen reflux quantity of fuel cell hydrogen ejector |
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