Durability test system and durability test method for hydrogen circulating pump

Abstract

The invention discloses a durability test system and a durability test method for a hydrogen circulating pump, and belongs to the technical field of fuel cells, the durability test system comprises an electric pile simulation unit, a gas supply unit, a humidity control unit, a water quantity control unit, an impurity collection unit and a temperature control unit, a galvanic pile inlet, a galvanic pile outlet and a galvanic pile exhaust port are formed in the accommodating cavity; the gas supply unit comprises a mixed gas source and a pressure control device. The durability test method comprises the following steps: S1, connecting a hydrogen circulating pump; s2, starting equipment such as an electric pile exhaust port, and adjusting the pressure, the water content and the temperature of the mixed gas; s3, after the pressure is stable, closing the mixed gas source, the pressure control equipment and an electric pile exhaust port; and S4, after a preset time, detecting the impurity content. The problems that parameters of a closed circulation loop are difficult to control and the use amount of hydrogen in an open-loop test mode is large can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a durability testing system and a durability testing method for a hydrogen circulation pump. Background Art

[0002] As the core component of the fuel cell engine, the hydrogen circulation pump is used to circulate the hydrogen from the fuel cell stack outlet to the stack inlet, humidify the dry hydrogen at the stack inlet, and realize the hydrogen recycling and water balance management inside the fuel cell. In the actual application scenario, the medium of the hydrogen circulation pump is a mixture of hydrogen and water vapor, and also contains a certain amount of liquid water. Usually, the liquid water is acidic, which can easily corrode the hydrogen circulation pump and reduce its service life.

[0003] Fuel cell commercial vehicles generally require a life span of more than 15,000 hours for hydrogen circulation pumps. Therefore, before using hydrogen circulation pumps in fuel cell commercial vehicles, the durability of hydrogen circulation pumps needs to be tested. The test environment needs to fit the actual usage scenario, which requires the ability to accurately control the test medium, test temperature, test pressure, and liquid water content. This is difficult for closed-loop cycle testing, so open-loop testing methods are currently commonly used. Open-loop testing methods use a large amount of hydrogen, which is not only costly but also wastes test resources. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned technical problems and provide a hydrogen circulation pump durability test system and a durability test method, which can form a closed-loop circulation test method that can control the test medium, test temperature, test pressure, test humidity and test liquid water content, thereby solving the problem of large hydrogen consumption, high cost and waste of test resources caused by the open-loop test method due to the difficulty in controlling parameters in the closed circulation loop, and greatly reducing the consumption of high-value test gas hydrogen.

[0005] The open-loop testing method consumes a large amount of hydrogen, is costly and wastes testing resources.

[0006] To achieve the above object, the present invention provides the following solution: The present invention discloses a hydrogen circulation pump durability test system, comprising:

[0007] The stack simulation unit comprises a chamber, wherein the chamber is provided with a stack inlet, a stack outlet and a stack exhaust port, the stack outlet is provided with a first pipeline for connecting to an air inlet of a hydrogen circulation pump, and the stack inlet is provided with a second pipeline for connecting to an air outlet of the hydrogen circulation pump;

[0008] a gas supply unit, comprising a mixed gas source and a pressure control device, wherein the mixed gas source is used to provide a mixed gas of hydrogen and nitrogen, the mixed gas source is connected to a gas inlet end of the pressure control device, and a gas outlet end of the pressure control device is connected to the first pipeline;

[0009] A humidity control unit, used for controlling the humidity of the mixed gas in the first pipeline;

[0010] A water control unit, used for controlling the water content of the mixed gas in the first pipeline;

[0011] An impurity collecting unit, used for collecting impurities in the mixed gas in the second pipeline;

[0012] and a temperature control unit, which is used to control the temperature of the mixed gas in the second pipeline.

[0013] Preferably, the mixed gas source includes a hydrogen source and a nitrogen source, the hydrogen source is connected to the air inlet end of the pressure control device through a hydrogen flow control device, and the nitrogen source is connected to the air inlet end of the pressure control device through a nitrogen flow control device.

[0014] Preferably, the stack exhaust port is provided with an exhaust valve and a flame arrester in sequence.

[0015] Preferably, a stack pressure relief port is provided on the chamber, and a safety valve is provided on the stack pressure relief port, and the safety valve is connected to the flame arrester.

[0016] Preferably, a back-pressure valve is provided on the second pipeline, and the back-pressure valve is located between the impurity collection unit and the fuel cell stack inlet.

[0017] Preferably, the temperature control unit comprises a heat exchanger and a temperature control device, and the temperature control device exchanges heat with the second pipeline through the heat exchanger.

[0018] Preferably, the first pipeline and the second pipeline are both provided with a temperature detection device and a pressure detection device.

[0019] Preferably, it also includes a power supply unit, which is used to supply power to the gas supply unit, the stack simulation unit, the humidity control unit, the water volume control unit and the temperature control unit.

[0020] Also disclosed is a hydrogen circulation pump durability test method, which uses the above-mentioned hydrogen circulation pump durability test system and includes the following steps:

[0021] S1. Connecting a hydrogen circulation pump: connecting an air inlet end and an air outlet end of the hydrogen circulation pump to a first pipeline and a second pipeline respectively;

[0022] S2. Control system parameters: turn on the mixed gas source, pressure control equipment, hydrogen circulation pump, water volume control unit, humidity control unit, temperature control unit and stack exhaust port to adjust the pressure, water content, temperature and temperature of the mixed gas;

[0023] S3, forming a closed cycle: after the pressure stabilizes, close the mixed gas source, pressure control equipment and stack exhaust port;

[0024] S4. Obtaining a durability attenuation law: After a preset time, the hydrogen circulation pump is turned off, and the impurity content collected by the impurity collection unit is detected to obtain a durability performance attenuation law of the hydrogen circulation pump.

[0025] Preferably, the deterioration test conditions of the hydrogen circulation pump are selected according to the test requirements, and the deterioration test conditions include increasing the water content, increasing the humidity, increasing the acidity of the water and / or the temperature of the mixed gas to shorten the test time.

[0026] Compared with the prior art, the present invention has achieved the following technical effects:

[0027] In the present invention, a gas supply unit can provide a preset ratio of hydrogen and nitrogen mixed gas. Through the pressure control unit, the humidity control unit, the water control unit, and the temperature control unit, in coordination with the opening and closing of the stack exhaust port of the stack simulation unit, an open-loop circulation stage can be formed first to adjust the pressure, humidity, temperature and water content, and then a closed-loop circulation stage can be formed to maintain the pressure, humidity, temperature and water content, thereby providing a hydrogen circulation pump with actual working scenes and harsh working scenes, and even increasing the test parameters according to the test requirements to provide a test working scene, speed up the test, collect impurities in the circulation within a preset time through the impurity collection unit, and then obtain the change law of the durability performance of the hydrogen circulation pump, so as to further study the influence of gas-liquid two-phase flow and acidic medium on the durability performance of the hydrogen circulation pump. Compared with the traditional pure open-loop test method, a large amount of hydrogen is saved, and the test cost and resource waste are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 Schematic diagram of the structure of the hydrogen circulation pump durability test system in the embodiment;

[0030] Figure 2 A schematic diagram of gas flow during the pressure regulation process of the hydrogen circulation pump durability test system in the embodiment;

[0031] Figure 3 Schematic diagram of gas flow during the circulation process of the hydrogen circulation pump durability test system in the embodiment.

[0032] Description of reference numerals:

[0033] 1. Stack simulation unit; 2. Gas supply unit; 3. Humidity control unit; 4. Water volume control unit; 5. Impurity collection unit; 6. Temperature control unit; 7. Power supply unit; 8. Hydrogen circulation pump;

[0034] 11. Chamber; 12. Safety valve; 13. Exhaust valve; 14. Fire arrester; 15. Back pressure valve;

[0035] 21. Hydrogen gas source; 22. Hydrogen gas flow control equipment; 23. Nitrogen gas source; 24. Nitrogen gas flow control equipment; 25. Pressure control equipment;

[0036] 61. Heat exchanger; 62. Temperature control equipment. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] This embodiment provides a hydrogen circulation pump durability test system. Figures 1 to 3 As shown, it includes a stack simulation unit 1, a gas supply unit 2, a humidity control unit 3, a water volume control unit 4, an impurity collection unit 5 and a temperature control unit 6.

[0040] The stack simulation unit 1 includes a cavity 11, which is a hollow cavity. The cavity 11 is provided with a stack inlet, a stack outlet and a stack exhaust port. A first pipeline is provided on the stack outlet, and the first pipeline is used to connect to the air inlet of the hydrogen circulation pump 8. A second pipeline is provided on the stack inlet, and the second pipeline is used to connect to the air outlet of the hydrogen circulation pump 8.

[0041] The gas supply unit 2 includes a mixed gas source and a pressure control device 25. The mixed gas source is used to provide a mixed gas, which is a mixture of hydrogen and nitrogen. The mixed gas source is connected to the gas inlet end of the pressure control device 25, and the gas outlet end of the pressure control device 25 is connected to the first pipeline.

[0042] The humidity control unit 3 is used to control the humidity of the mixed gas in the first pipeline, and is used to simulate the humidity of the medium discharged from the fuel cell stack outlet after the fuel cell reaction. The humidity can simulate the humidity of the actual working conditions, and can also be tightened to a certain extent according to the test requirements to speed up the test.

[0043] The water volume control unit 4 is used to control the water content of the mixed gas in the first pipeline, and is used to simulate the water content of the medium discharged from the fuel cell stack outlet after the fuel cell reaction. The water content can simulate the water content of the actual working conditions, and can also be tightened to a certain extent according to the test requirements to speed up the test. In addition, the water introduced into the water volume control unit 4 can be replaced with acidic water to speed up the test.

[0044] The impurity collecting unit 5 is used to collect impurities in the mixed gas in the second pipeline.

[0045] The temperature control unit 6 is used to control the temperature of the mixed gas in the second pipeline, and is used to simulate the temperature of the medium discharged from the fuel cell stack outlet after the fuel cell reaction. This temperature can simulate the temperature of the actual working conditions, and can also be tightened to a certain extent according to the test requirements to speed up the test, and can avoid the problem of temperature rise in the system pipeline caused by continuous operation of the hydrogen circulation pump 8.

[0046] Among them, the stack simulation unit 1, the humidity control unit 3, the water control unit 4 and the temperature control unit 6 jointly simulate the fuel cell, provide a working scenario for the hydrogen circulation pump 8, and then the durability performance attenuation law of the hydrogen circulation pump 8 can be determined by the amount of impurities collected by the impurity collection unit 5 within a predetermined time.

[0047] Working principle:

[0048] First, connect the hydrogen circulation pump 8, connect the air inlet of the hydrogen circulation pump 8 to the first pipeline, and connect the air outlet of the hydrogen circulation pump 8 to the second pipeline;

[0049] Then, the mixed gas source, the pressure control device 25, the hydrogen circulation pump 8, the humidity control unit 3, the water volume control unit 4, the temperature control unit 6 and the stack exhaust port are turned on. The mixed gas source provides mixed gas for the entire system. The pressure control device 25 adjusts the pressure of the mixed gas in the system. The humidity control unit 3, the water volume control unit 4 and the temperature control unit 6 respectively adjust the humidity, water content and temperature of the mixed gas in the system.

[0050] Then, after the pressure is stabilized, the mixed gas source, the pressure control device 25 and the stack exhaust port are closed to form a closed mixed gas self-circulation in the system;

[0051] Finally, after the preset time, the hydrogen circulation pump 8 is stopped and the impurity content (such as weight) collected by the impurity collection unit 5 is detected. During the opening stage of the stack exhaust port, in addition to playing the role of open-loop pressure regulation, the mixed gas also plays a cleaning role. Therefore, in the closed cycle stage, the impurities at this time are basically impurities generated by corrosion during the operation of the hydrogen circulation pump 8. Therefore, the durability performance attenuation law of the hydrogen circulation pump 8 can be obtained according to the impurity content within the preset time, that is, the attenuation rate can be obtained by dividing the impurity content by the preset time, and then the service life of the connected hydrogen circulation pump 8 can be inferred according to the attenuation rate.

[0052] Compared with the open-loop cycle test method, this hydrogen circulation pump durability test system has the following advantages:

[0053] ① It solves the problem of difficult control of closed circulation system loop pressure, temperature and other parameters. By adopting a closed circulation method, the consumption of high-value test gas hydrogen is greatly reduced.

[0054] ② Multiple harsh working conditions can be combined and set according to actual needs, such as adjusting the ratio of hydrogen and nitrogen media, adjusting the relative humidity of the mixed gas, injecting liquid water and adding acidic media according to the working conditions, and heating the test medium through the temperature control device to further deteriorate the test environment, speed up the test, and shorten the endurance test time of the hydrogen circulation pump 8.

[0055] In one embodiment, if Figures 1 to 3 As shown, the mixed gas source includes a hydrogen source 21 and a nitrogen source 23. The hydrogen source 21 is connected to the gas inlet end of the pressure control device 25 through a hydrogen flow control device 22, and the nitrogen source 23 is connected to the gas inlet end of the pressure control device 25 through a nitrogen flow control device 24. The hydrogen ratio can be controlled by the hydrogen flow control device 22, and the nitrogen ratio can be controlled by the nitrogen source 23.

[0056] Further, in one embodiment, if Figures 1 to 3 As shown, both the hydrogen flow control device 22 and the nitrogen flow control device 24 can adopt the setting mode of proportional valve + flow meter, that is, the proportional valve and the flow meter are connected in series between the hydrogen gas source 21 and the pressure control device 25. The proportional valve and the flow meter are connected in series between the nitrogen gas source 23 and the pressure control device 25. Of course, the hydrogen flow control device 22 and the nitrogen flow control device 24 can also use other devices for flow control.

[0057] In one embodiment, if Figures 1 to 3 As shown, the pressure control device 25 adopts a mass flow controller, which is a common component used in industrial equipment and is used to control the pressure of the mixed gas.

[0058] In one embodiment, if Figures 1 to 3As shown, the humidity control unit 3 includes a humidification device. The humidification device can adopt a combination of bubbling humidification and spraying humidification, which is a common industrial component. Of course, the humidification device can also adopt other humidification devices.

[0059] In one embodiment, if Figures 1 to 3 As shown, the exhaust port of the stack is provided with an exhaust valve 13 and a flame arrester 14 in sequence, and the exhaust port of the stack is opened and closed by the exhaust valve 13. The exhaust valve 13 can be a solenoid valve.

[0060] In one embodiment, if Figures 1 to 3 As shown, the chamber 11 is provided with a stack pressure relief port, and the stack pressure relief port is provided with a safety valve 12, and the safety valve 12 is connected to the flame arrester 14, so that the safety valve 12 is arranged in parallel with the exhaust valve 13. When the pressure in the system exceeds the target limit, the safety valve 12 opens to avoid safety risks.

[0061] In one embodiment, if Figures 1 to 3 As shown, a back pressure valve 15 is provided on the second pipeline, and the back pressure valve 15 is located between the impurity collection unit 5 and the inlet of the fuel cell stack. The outlet pressure of the hydrogen circulation pump 8 is controlled by the back pressure valve 15.

[0062] In one embodiment, if Figures 1 to 3 As shown, the temperature control unit 6 includes a heat exchanger 61 and a temperature control device 62. The temperature control device 62 exchanges heat with the second pipeline through the heat exchanger 61. The hydrogen circulation pump 8 generates heat during transportation, which increases the gas temperature in the system. The heat exchange between the heat exchanger 61 and the temperature control device 62 can control the outlet gas temperature of the hydrogen circulation pump 8, so that the gas temperature in the system is maintained at a preset temperature.

[0063] Further, in one embodiment, if Figures 1 to 3 As shown, the temperature control device 62 can be a water chiller, which can be used for cooling or heating and is a common industrial device. Of course, the above is only a preferred method, and the temperature control device 62 can also use other devices for temperature control.

[0064] In one embodiment, if Figures 1 to 3 As shown, the water volume control unit 4 includes a water injection device, through which liquid water is injected into the first pipeline.

[0065] Further, if Figures 1 to 3 As shown, the water injection device can be a combination of a water storage tank and a water supply device. That is, the water in the water storage tank is injected into the first pipeline through the water supply device. The water storage tank can be pre-filled with pure water or acidic water, or pure water can be pre-filled first, and acidic substances can be added later to adjust it into acidic water.

[0066] In one embodiment, if Figures 1 to 3As shown, the first pipeline and the second pipeline are both provided with a temperature detection device and a pressure detection device. The temperature detection device can be a temperature sensor or a thermometer, etc., and the pressure detection device can be a pressure sensor or a pressure transmitter, etc.

[0067] In one embodiment, if Figures 1 to 3 As shown, the impurity collecting unit 5 includes a filter, through which impurities in the gas are intercepted, and the impurities are substances corroded from the hydrogen circulation pump 8.

[0068] In one embodiment, if Figures 1 to 3 As shown, it also includes a power supply unit 7, which is used to supply power to the gas supply unit 2, the stack simulation unit 1, the humidity control unit 3, the water volume control unit 4 and the temperature control unit 6. The power supply unit 7 can be powered by the mains or by a power generation device.

[0069] In one embodiment, if Figures 1 to 3 As shown, it also includes a control management unit, which is used to control the stack simulation unit 1, the gas supply unit 2, the humidity control unit 3, the water volume control unit 4, the temperature control unit 6 and the power supply unit 7. The control management unit includes a controller, which can be a PLC controller, a single chip microcomputer or a hollow platform, etc. The power supply unit 7 can also supply power to the control management unit.

[0070] Example 2

[0071] This embodiment provides a method for testing the durability of a hydrogen circulation pump. Figures 1 to 3 As shown, the hydrogen circulation pump durability test system in Example 1 is used, including the following steps:

[0072] S1. Connecting the hydrogen circulation pump: connecting the air inlet and air outlet of the hydrogen circulation pump 8 to the first pipeline and the second pipeline respectively;

[0073] S2. Control system parameters: turn on the mixed gas source, pressure control device 25, hydrogen circulation pump 8, humidity control unit 3, water volume control unit 4, temperature control unit 6 and stack exhaust port to adjust the pressure, water content, temperature and temperature of the mixed gas;

[0074] S3, forming a closed cycle: after the pressure is stabilized, the mixed gas source, the pressure control device 25 and the stack exhaust port are closed to form a closed mixed gas self-circulation in the system;

[0075] S4, obtaining the durability attenuation law: after a preset time, the hydrogen circulation pump 8 is turned off, the impurity content collected by the impurity collection unit 5 is detected, and the durability performance attenuation law of the hydrogen circulation pump 8 is obtained according to the impurity content within the preset time. That is, the attenuation rate can be obtained by dividing the impurity content by the preset time, and then the service life of the hydrogen circulation pump 8 can be inferred according to the attenuation rate.

[0076] Replace the new hydrogen circulation pump 8 and test the new hydrogen circulation pump 8. In the stage of opening the exhaust port of the stack, in addition to playing the role of open-loop pressure regulation, the mixed gas also plays a cleaning role, which can clean the impurities in the system before access, such as impurities brought in by the air, and impurities that may remain in the system before the previous test. Therefore, in the closed cycle stage, the impurities at this time are basically impurities generated by corrosion during the operation of the hydrogen circulation pump 8. Therefore, the durability performance attenuation law of the hydrogen circulation pump 8 can be obtained according to the impurity content within the preset time.

[0077] In one embodiment, if Figures 1 to 3 As shown, the medium ratio (hydrogen and nitrogen ratio) of the mixed gas is determined according to the working point state of the fuel cell engine applied by the tested hydrogen circulation pump 8. The hydrogen and nitrogen ratio is usually a volume ratio, and the flow ratio of hydrogen and nitrogen is the volume ratio.

[0078] In one embodiment, if Figures 1 to 3 As shown, according to the inlet and outlet pressure difference range, flow range, speed range, power range and other information of the hydrogen circulation pump 8, the speed test operating point of the hydrogen circulation pump is determined, and the selection of the operating point should cover the minimum speed and the maximum speed.

[0079] In one embodiment, if Figures 1 to 3 As shown, according to the application scenario or test requirements of the hydrogen circulation pump 8, the test pressure, humidity, temperature and water content are determined. The water content, humidity and temperature of the gas in the system can be adjusted by the pressure control device 25, the humidity control unit 3, the water control unit 4 and the temperature control unit 6. According to the application scenario, the pressure, water content, humidity and temperature can simulate the actual working condition values. According to the test requirements, the pressure, water content, humidity and temperature can be increased to any value or multiple values ​​to speed up the test.

[0080] In one embodiment, if Figures 1 to 3 As shown, the water provided by the water quantity control unit 4 can be replaced with acidic water, or acidic substances can be directly added to the water.

[0081] In one embodiment, if Figures 1 to 3 As shown, the temperature of the test mixed gas is controlled by the heat exchanger 61 and the temperature control device 62 in the temperature control unit 6, and the outlet gas of the hydrogen circulation pump 8 is cooled at the same time.

[0082] In one embodiment, if Figures 1 to 3 As shown, the deterioration test conditions of the hydrogen circulation pump are selected according to the test requirements. The deterioration test conditions include increasing the water content, increasing the humidity, increasing the acidity of the water and / or the temperature of the mixed gas to shorten the test time.

[0083] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hydrogen circulation pump durability test system, characterized in that: include: The stack simulation unit comprises a chamber, wherein the chamber is provided with a stack inlet, a stack outlet and a stack exhaust port, the stack outlet is provided with a first pipeline for connecting to an air inlet of a hydrogen circulation pump, and the stack inlet is provided with a second pipeline for connecting to an air outlet of the hydrogen circulation pump; a gas supply unit, comprising a mixed gas source and a pressure control device, wherein the mixed gas source is used to provide a mixed gas of hydrogen and nitrogen, the mixed gas source is connected to a gas inlet end of the pressure control device, and a gas outlet end of the pressure control device is connected to the first pipeline; A humidity control unit, used for controlling the humidity of the mixed gas in the first pipeline; A water control unit, used for controlling the water content of the mixed gas in the first pipeline; An impurity collecting unit, used for collecting impurities in the mixed gas in the second pipeline; and a temperature control unit, which is used to control the temperature of the mixed gas in the second pipeline.

2. The hydrogen circulation pump durability test system according to claim 1, characterized in that: The mixed gas source includes a hydrogen source and a nitrogen source. The hydrogen source is connected to the air inlet end of the pressure control device through a hydrogen flow control device, and the nitrogen source is connected to the air inlet end of the pressure control device through a nitrogen flow control device.

3. The hydrogen circulation pump durability test system according to claim 1, characterized in that: The stack exhaust port is provided with an exhaust valve and a flame arrester in sequence.

4. The hydrogen circulation pump durability test system according to claim 3, characterized in that: The chamber is provided with a stack pressure relief port, the stack pressure relief port is provided with a safety valve, and the safety valve is connected to the flame arrester.

5. The hydrogen circulation pump durability test system according to claim 1, characterized in that: A back-pressure valve is provided on the second pipeline, and the back-pressure valve is located between the impurity collection unit and the stack inlet.

6. The hydrogen circulation pump durability test system according to claim 1, characterized in that: The temperature control unit includes a heat exchanger and a temperature control device, and the temperature control device exchanges heat with the second pipeline through the heat exchanger.

7. The hydrogen circulation pump durability test system according to claim 1, characterized in that: The first pipeline and the second pipeline are both provided with a temperature detection device and a pressure detection device.

8. The hydrogen circulation pump durability test system according to claim 7, characterized in that: It also includes a power supply unit, which is used to supply power to the gas supply unit, the stack simulation unit, the humidity control unit, the water volume control unit and the temperature control unit.

9. A hydrogen circulation pump durability test method, characterized in that: A hydrogen circulation pump durability test system as described in any one of claims 1 to 8 is used, comprising the following steps: S1. Connecting a hydrogen circulation pump: connecting an air inlet end and an air outlet end of the hydrogen circulation pump to a first pipeline and a second pipeline respectively; S2. Control system parameters: turn on the mixed gas source, pressure control equipment, hydrogen circulation pump, water volume control unit, humidity control unit, temperature control unit and stack exhaust port to adjust the pressure, water content, temperature and temperature of the mixed gas; S3, forming a closed cycle: after the pressure stabilizes, close the mixed gas source, pressure control equipment and stack exhaust port; S4. Obtaining a durability attenuation law: After a preset time, the hydrogen circulation pump is turned off, and the impurity content collected by the impurity collection unit is detected to obtain a durability performance attenuation law of the hydrogen circulation pump.

10. The hydrogen circulation pump durability test method according to claim 9, characterized in that: Deterioration test conditions of the hydrogen circulation pump are selected according to the test requirements. The deterioration test conditions include increasing the water content, increasing the humidity, increasing the acidity of the water and / or the temperature of the mixed gas to shorten the test time.

Images