Gas temperature and humidity control system and method for testing hydrogen fuel cell stack

Abstract

A gas temperature and humidity control system and method for testing a hydrogen fuel cell stack are characterized in that deionized water is heated through a heater in a heating water tank, then temperature control over the deionized water is achieved through a plate heat exchanger, and the heated deionized water enters a humidifier after being pressurized; after the pressure of gas (air or hydrogen) is controlled through the pneumatic angle seat valve and the flow of the gas is controlled through the mass flow controller, the temperature of the gas is detected before the gas enters the humidifier, and the PLC adjusts the temperature of the deionized water in real time according to the detected temperature of the gas, so that the temperature of the deionized water is adjusted in real time. And after the temperature of the humidified gas meets the temperature requirement of operation of the hydrogen fuel cell stack, the humidified gas enters the humidifier, and the humidified gas meeting the pressure and temperature requirements is introduced into the hydrogen fuel cell stack.

Description

Technical Field

[0001] The present invention relates to a hydrogen fuel cell stack test system and method. Specifically, the present invention relates to a test system and method for testing a hydrogen fuel cell stack. More specifically, the present invention relates to a gas temperature and humidity control system and method for testing a hydrogen fuel cell stack. Background Art

[0002] A hydrogen fuel cell stack is a place where an electrochemical reaction occurs and is the core component of a hydrogen fuel cell system, maintaining the energy output process of the entire fuel cell system. The fuel cell stack is composed of multiple single cells. During operation, hydrogen and oxygen respectively pass through the main gas channels of the stack and are distributed to the bipolar plates of each single cell. Through the bipolar plate diversion, they are evenly distributed to the electrodes and undergo an electrochemical reaction by contacting the catalyst through the electrode support.

[0003] During the conversion process of a fuel cell engine, the process does not involve combustion, has no mechanical loss, has a high energy conversion rate, and the products are only electricity, heat, and water. It operates smoothly and has low noise, so it is called the ultimate environmentally friendly engine. In addition, the power generation efficiency of a fuel cell can reach more than 50%, and the energy conversion rate can reach 60% - 80%. This is determined by the conversion nature of the fuel cell. Using a hydrogen fuel cell to generate electricity directly converts the chemical energy of the fuel into electrical energy without going through intermediate conversions of heat energy and mechanical energy (generator). There is no need for combustion, and it has less pollution, less noise, and the device can be large or small, being very flexible. Therefore, it has received great attention and development in the industry.

[0004] However, hydrogen has active chemical properties. In addition, hydrogen and air are consumed during the testing and normal operation of a hydrogen fuel cell stack. At the same time, the temperature and humidity of hydrogen and air play a very important role in the operating efficiency and safety of a hydrogen fuel cell stack. Therefore, during the testing of a hydrogen fuel cell stack, it is necessary to precisely control the temperature and humidity of hydrogen and air. Thus, the gas temperature and humidity control system and method will play a very crucial role during the hydrogen fuel cell testing process.

[0005] However, so far, for various test bench manufacturers at home and abroad, the commonly used gas temperature and humidity for the hydrogen fuel cell stack test benches they provide are mainly controlled by methods such as spray humidification or bubbling humidification. However, both the spray humidification method and the bubbling humidification method have disadvantages such as low humidification efficiency and uneven humidity of the humidified gas. Summary of the Invention

[0006] To solve the above problems, the purpose of the present invention is:

[0007] Provided is a gas temperature and humidity control system and method for hydrogen fuel cell stack testing. According to this system and method, the pressure and temperature can be controlled in real time by a PLC (automation control system) to ensure that the gas pressure and temperature entering the stack meet the requirements of stack testing.

[0008] According to a gas temperature and humidity control system and method for hydrogen fuel cell stack testing of the present invention, it can be adjusted according to the gas temperature and humidity control requirements that can meet different test pieces (i.e., stacks from different manufacturers), and has a wide application range.

[0009] The principle of the present invention is as follows: On the hydrogen fuel cell stack test bench, deionized water after heating and pressurization and gas after pressure regulation and temperature regulation pass through a humidifier together. In the humidifier, the deionized water quickly and evenly melts into the gas to heat and humidify the gas. Finally, after the gas temperature and humidity are controlled and meet the requirements, it enters the hydrogen fuel cell stack.

[0010] To achieve the above object, the technical solution of the present invention is as follows:

[0011] A gas temperature and humidity control system for hydrogen fuel cell stack testing, characterized in that

[0012] A ventilation main pipeline provided with a pneumatic angle seat valve and a sensor passes gas into a humidifier.

[0013] The mass flow controller is used to control the gas flow rate before entering the humidifier.

[0014] The pneumatic angle seat valve and the sensor are used to control and adjust the gas pressure and temperature before entering the humidifier.

[0015] The gas that meets the pressure and temperature requirements after control and adjustment enters the humidifier through the ventilation main pipeline. The ventilation main pipeline is also connected to a high-level water tank.

[0016] A water passing pipeline provided with a solenoid valve and a check valve passes humidifying water, that is, deionized water, into the water tank, and the water in the water tank flows out to a heating water tank.

[0017] In the heating water tank, the deionized water is heated by a heater, and then the temperature control, adjustment and pressurization of the deionized water are realized through a plate heat exchanger. The heated and pressurized deionized water is pumped into the humidifier by a water pump.

[0018] The gas that meets the pressure, temperature and humidity control requirements after humidification in the humidifier is passed into the hydrogen fuel cell stack, and the deionized water returns to the water tank.

[0019] A gas temperature and humidity control system for testing a hydrogen fuel cell stack according to the present invention is characterized in that a pneumatic angle seat valve is provided in the main ventilation pipeline before the gas enters the humidifier. Before the gas enters the humidifier, there is a bypass in the main ventilation pipeline communicating with a high-level water tank to balance the pressure of the gas and the deionized water pipeline and prevent damage to the humidifier due to unbalanced pressure (i.e., the pressure of the deionized water after pressurization before entering the humidifier is 10 Kpa less than the pressure of the gas before entering the humidifier).

[0020] A gas temperature and humidity control system for testing a hydrogen fuel cell stack according to the present invention is characterized in that the gas flow rate before entering the humidifier is controlled by a mass flow controller, and the gas flow rate is controlled in the range of 100 SLPM to 7000 SLPM, and the accuracy meets ±1%value±0.5%F.S.

[0021] 1%value±0.5%F.S. means that the repeatability accuracy of one percent of the flow rate value is 0.5%, which is equivalent to the repeatability output control accuracy of 0.5% after the flow rate control accuracy is calibrated.

[0022] A gas temperature and humidity control system for testing a hydrogen fuel cell stack according to the present invention is characterized in that the pressure range of the gas before entering the humidifier after being controlled by a pneumatic angle seat valve and a sensor is: 260 Kpa±1 Kpa;

[0023] The adjustment range of the gas temperature before entering the humidifier is: 10℃ to 60℃, and the accuracy meets ±1.5℃.

[0024] A gas temperature and humidity control system for testing a hydrogen fuel cell stack according to the present invention is characterized in that the water temperature of the deionized water before entering the humidifier after being heated by a heater in the heating water tank is controlled at 80℃±1 degree.

[0025] A gas temperature and humidity control system for testing a hydrogen fuel cell stack according to the present invention is characterized in that

[0026] The deionized water is pressurized before entering the humidifier so that the pressure of the deionized water after being pressurized and entering the humidifier is 10 Kpa lower than the pressure of the gas before entering the humidifier,

[0027] That is: the pressure of the deionized water after pressurization is 250 Kpa±1 Kpa.

[0028] A gas temperature and humidity control system for testing a hydrogen fuel cell stack according to the present invention is characterized in that when the humidified gas passes through the pneumatic angle seat valve, the pressure is controlled in the range of 260±1 Kpa, and then it enters the hydrogen fuel cell stack.

[0029] A method for controlling the temperature, humidity and gas of a hydrogen fuel cell stack for testing, characterized in that,

[0030] Through the main ventilation pipeline equipped with pneumatic angle seat valves and sensors, gas is introduced into the humidifier.

[0031] The mass flow controller is used to control the gas flow rate before entering the humidifier.

[0032] Through the pneumatic angle seat valve and sensor, the gas pressure and temperature before entering the humidifier are controlled and adjusted.

[0033] The gas that meets the pressure and temperature requirements after control and adjustment enters the humidifier through the main ventilation pipeline. The main ventilation pipeline is also connected to a high-level water tank.

[0034] Through the water pipeline equipped with solenoid valves and check valves, humidifying water - that is, deionized water - is introduced into the water tank, and the water in the water tank flows out to the heating water tank.

[0035] After the deionized water is heated by the heater in the heating water tank, the temperature control, adjustment and pressurization of the deionized water are realized through the plate heat exchanger. The heated and pressurized deionized water is pumped into the humidifier by the water pump.

[0036] The gas that meets the pressure, temperature and humidity control requirements after humidification in the humidifier is introduced into the hydrogen fuel cell stack, and the deionized water returns to the water tank.

[0037] According to the method for controlling the temperature, humidity and gas of a hydrogen fuel cell stack for testing described in the present invention, characterized in that a pneumatic angle seat valve is provided in the main ventilation pipeline before the gas enters the humidifier. Before the gas enters the humidifier, there is a bypass in the main ventilation pipeline connected to the high-level water tank to balance the pressure of the gas and deionized water pipelines and prevent damage to the humidifier due to unbalanced pressure (that is, the pressure of the deionized water after pressurization before entering the humidifier is 10 Kpa less than the pressure of the gas before entering the humidifier).

[0038] According to the method for controlling the temperature, humidity and gas of a hydrogen fuel cell stack for testing described in the present invention, characterized in that the mass flow controller is used to control the gas flow rate before entering the humidifier, and the gas flow rate is controlled in the range of 100 SLPM to 7000 SLPM, and the accuracy meets ±1%value±0.5%F.S.

[0039] 1%value±0.5%F.S. means that the repeatability accuracy of one percent of the flow value is 0.5%, which is equivalent to the repeatability output control accuracy of 0.5% after the flow control accuracy is calibrated.

[0040] According to the method for controlling the temperature, humidity and gas of a hydrogen fuel cell stack for testing described in the present invention, characterized in that,

[0041] The pressure range after controlling the gas pressure before entering the humidifier through a pneumatic angle seat valve and a sensor is: 260 Kpa ± 1 Kpa;

[0042] Control the gas temperature before entering the humidifier, and the control range is: 10°C to 60°C, and the accuracy meets ±1.5°C.

[0043] According to the method for controlling the gas temperature and humidity for testing a hydrogen fuel cell stack of the present invention, it is characterized in that the water temperature of the deionized water entering the humidifier after being heated by the heater in the heating water tank is controlled to 80°C ± 1 degree.

[0044] According to the method for controlling the gas temperature and humidity for testing a hydrogen fuel cell stack of the present invention, it is characterized in that the deionized water is pressurized before entering the humidifier, so that the pressure of the deionized water after pressurization is 10 Kpa lower than the gas pressure before entering the humidifier.

[0045] That is: the pressure of the deionized water after pressurization is 250 Kpa ± 1 Kpa.

[0046] According to the method for controlling the gas temperature and humidity for testing a hydrogen fuel cell stack of the present invention, it is characterized in that the gas and the deionized water enter the humidifier at the same time. While the gas is humidified by the deionized water in the humidifier, the temperature of the gas is heated to 60 ± 1.5°C to ensure that the temperature of the humidified gas meets the test change requirements of different tested parts.

[0047] According to the method for controlling the gas temperature and humidity for testing a hydrogen fuel cell stack of the present invention, it is characterized in that the humidified gas is pressure-controlled by a pneumatic angle seat valve, and the pressure is controlled to the range of 260 ± 1 Kpa, and then enters the hydrogen fuel cell stack.

[0048] According to the method for controlling the gas temperature and humidity for testing a hydrogen fuel cell stack of the present invention, it is characterized in that when starting up and running, first pass the gas, open the pneumatic angle seat valve of the main gas pipeline and the pneumatic angle seat valve of the bypass of the main gas pipeline. The gas pressure is transmitted to the water side of the membrane humidifier through the deionized water to achieve pressure balance on both sides of the membrane humidifier, and then start the water pump to provide humidifying water for the gas;

[0049] When shutting down and running, first close the water pump and then close the gas valve to achieve real-time pressure balance.

[0050] According to the method for controlling the gas temperature and humidity for testing a hydrogen fuel cell stack of the present invention, it is characterized in that the main gas pipeline is connected to the high-level water tank of the deionized water and pressure monitoring is carried out: always ensure that the pressure of the deionized water before entering the humidifier and after pressurization is 10 Kpa smaller than the gas pressure before entering the humidifier, that is, the pressure of the deionized water is: 250 Kpa ± 1 Kpa, and the gas pressure is: 260 Kpa ± 1 Kpa.

[0051] Thus, the pressure balance between the ventilation main pipeline and the deionized water pipeline can be achieved, ultimately meeting the gas humidification requirement, and at the same time preventing the damage of the humidifier caused by the pressure imbalance between the gas path and the water path.

[0052] A method for controlling the temperature and humidity of gas for testing a hydrogen fuel cell stack according to the present invention is characterized in that

[0053] A humidification circulating water path is set:

[0054] A humidification circulating water path of ventilation pipeline bypass - elevated water tank - water tank - heating tank - plate heat exchanger - water pump - humidifier - ventilation pipeline bypass is formed, and the deionized water returns to the humidification circulating water path.

[0055] According to the present invention, the pneumatic angle seat valve is mainly used to regulate the gas pressure. The humidified gas passes through the pneumatic angle seat valve to finely adjust the pressure to achieve precise pressure control. During the whole testing process, due to the pipeline length and in order to prevent pressure fluctuations caused by the pressure regulation of the pneumatic angle seat valve, precise pressure control is achieved through multiple fine adjustments.

[0056] According to the present invention, it is characterized in that when starting up and running, first pass the gas, open the pneumatic angle seat valve of the ventilation main pipeline and the pneumatic angle seat valve of the gas main pipeline bypass. The gas pressure is transmitted to the water side of the membrane humidifier through the deionized water to achieve the pressure balance on both sides of the membrane humidifier, and then start the water pump to provide humidifying water for the gas;

[0057] When shutting down and running, first close the water pump and then close the gas valve to achieve real-time pressure balance.

[0058] A gas temperature and humidity control system and method for testing a hydrogen fuel cell stack according to the present invention is characterized in that the ventilation main pipeline is connected to the elevated water tank of the deionized water and pressure monitoring is carried out: always ensure that the pressure ratio of the deionized water before entering the humidifier and after pressurization is 10 Kpa less than the gas pressure before entering the humidifier, that is, the deionized water pressure is 250 Kpa ± 1 Kpa and the gas pressure is 260 Kpa ± 1 Kpa.

[0059] Thus, the pressure balance between the ventilation main pipeline and the deionized water pipeline can be achieved, ultimately meeting the gas humidification requirement, and at the same time preventing the damage of the humidifier caused by the pressure imbalance between the gas path and the water path.

[0060] A gas temperature and humidity control system and method for testing a hydrogen fuel cell stack according to the present invention is characterized in that the pressure and temperature are detected again before the humidified gas enters the fuel cell stack (generally the pressure is 260 ± 1 Kpa and the temperature is 60 ± 1.5 °C) to ensure that the gas pressure and temperature entering the fuel cell stack meet the fuel cell stack test requirements.

[0061] According to the present invention, the gas temperature and humidity control system and method for hydrogen fuel cell stack testing are installed on the hydrogen fuel cell stack test bench.

[0062] Advantages of the present invention:

[0063] 1. The gas humidification efficiency is significantly improved compared with the traditional gas humidification method (the humidification efficiency can be increased by more than 50%);

[0064] 2. The gas humidification is more uniform (the humidity in this project can reach 60% ± 0.5% F.S., while the traditional one is generally 60% ± 3% F.S.);

[0065] 3. The structure is simple, the manufacturing cost is low, and the control method is simple. Description of the Drawings

[0066] Figure 1 It is the schematic diagram of the gas temperature and humidity control system.

[0067] In the figure, T represents the temperature sensor and P represents the pressure sensor. Detailed Embodiments

[0068] Embodiment 1

[0069] A hydrogen gas temperature and humidity control system and method for hydrogen fuel cell stack testing can be adjusted to meet the hydrogen gas temperature and humidity control requirements of different test pieces (i.e., fuel cell stacks from different manufacturers), and has a wide application range.

[0070] The principle of the present invention is: on the hydrogen fuel cell stack test bench, the deionized water after heating and pressurization and the hydrogen gas after pressure regulation and temperature regulation pass through the humidifier together. In the humidifier, the deionized water quickly and evenly melts into the hydrogen gas to heat and humidify the hydrogen gas, and finally the temperature and humidity control and requirements of the hydrogen gas are achieved and then enter the hydrogen fuel cell stack.

[0071] In this embodiment, a humidification circulation water path of ventilation pipeline bypass - elevated water tank - water tank - heating tank - plate heat exchanger - water pump - humidifier - ventilation pipeline bypass is formed, and the deionized water returns to the humidification circulation water path.

[0072] The principle of the present invention is that the deionized water after heating and pressurization and the hydrogen gas after pressure regulation pass through the humidifier together. In the humidifier, the deionized water quickly and evenly melts into the hydrogen gas to heat and humidify the hydrogen gas, and finally the temperature and humidity control of the hydrogen gas is achieved.

[0073] In Figure 1 the deionized water is heated by the heater in the heating water tank, and then the temperature of the deionized water is accurately controlled through the plate heat exchanger. After passing through the plate heat exchanger, the deionized water is pressurized by the centrifugal pump for the heated deionized water, and finally the heated and pressurized deionized water enters the humidifier.

[0074] In Figure 1 the hydrogen pressure is controlled multiple times by a pneumatic angle valve seat, and after the flow rate of hydrogen is controlled by a mass flow controller, it enters the humidifier.

[0075] Before hydrogen enters the humidifier, the temperature of hydrogen is detected, and the PLC adjusts the temperature of deionized water in real time according to the detected hydrogen temperature, which can ensure that the temperature of the humidified hydrogen meets the temperature requirements for the operation of the hydrogen fuel cell stack.

[0076] Before hydrogen enters the humidifier, a pipeline is added to connect with the high-level water tank of deionized water beam, and pressure monitoring is carried out, which can achieve the pressure balance between the hydrogen pipeline and the deionized water pipeline, finally meet the hydrogen humidification requirements, and at the same time prevent the damage of the humidifier caused by the imbalance of the gas path and water path pressures.

[0077] The humidified hydrogen enters the hydrogen fuel cell stack after pressure control by a pneumatic angle valve seat, and the pressure and temperature are detected again before entering the stack, so as to realize the real-time control of pressure and temperature by the PLC, and ensure that the pressure and temperature of the hydrogen entering the stack meet the test requirements of the stack.

[0078] As Figure 1 shown, hydrogen is introduced into the humidifier through the main ventilation pipeline provided with a pneumatic angle seat valve and sensors, and the flow rate of hydrogen before entering the humidifier is controlled by a mass flow controller. The hydrogen flow rate is controlled in the range of 100 SLPM to 7000 SLPM, and the accuracy meets ±1% value ±0.5% F.S.

[0079] The pressure of hydrogen before entering the humidifier is controlled by a pneumatic angle seat valve and sensors, and the controlled pressure range is: 260 Kpa ±1 Kpa.

[0080] The control adjustment range of the temperature of hydrogen before entering the humidifier is: 30℃ to 50℃, and the accuracy meets ±1.5℃.

[0081] The pressure and temperature of hydrogen before entering the humidifier are controlled and adjusted by a pneumatic angle seat valve and sensors. The hydrogen that meets the pressure and temperature requirements after control and adjustment enters the humidifier through the main ventilation pipeline. Through the water pipeline provided with a solenoid valve and a check valve, humidifying water - that is, deionized water is introduced into the water tank. The water in the water tank flows out to the heating water tank, and the temperature of the deionized water after being heated by the heater in the heating water tank before entering the humidifier is controlled at 80℃ ±1 degree.

[0082] The deionized water is pressurized before entering the humidifier, so that the pressure of the deionized water after being pressurized and entering the humidifier is 10 Kpa lower than the pressure of the hydrogen before entering the humidifier, that is: the pressure of the deionized water after pressurization is 250 Kpa ±1 Kpa.

[0083] After the deionized water is heated by a heater in the heating water tank, the temperature control, adjustment and pressurization of the deionized water are realized through a plate heat exchanger. The heated and pressurized deionized water is pumped into the humidifier by a water pump.

[0084] The hydrogen gas that meets the pressure and temperature and humidity control requirements after being humidified in the humidifier is introduced into the hydrogen fuel cell stack, and the deionized water returns to the water tank.

[0085] A pneumatic angle seat valve is set in the ventilation main pipeline before the hydrogen gas enters the humidifier. Before the hydrogen gas enters the humidifier, there is a bypass in the ventilation main pipeline that is connected to the high-level water tank to balance the pressure of the hydrogen gas and deionized water pipelines and prevent damage to the humidifier due to unbalanced pressure (that is, the pressure of the deionized water after pressurization before entering the humidifier is 10 Kpa less than the pressure of the hydrogen gas before entering the humidifier).

[0086] When the humidified hydrogen gas passes through the pneumatic angle seat valve, the pressure is controlled in the range of 260±1 Kpa. Then, it enters the hydrogen fuel cell stack. The humidified hydrogen gas enters the hydrogen fuel cell stack after pressure control through the pneumatic angle valve seat, and the pressure and temperature are detected again before entering the stack to realize the real-time control of pressure and temperature by PLC, ensuring that the pressure and temperature of the hydrogen gas entering the stack meet the test requirements of the stack.

[0087] Embodiment 2

[0088] Except that the gas is changed from hydrogen to air, the others are basically the same as those in Embodiment 1, and a hydrogen gas temperature and humidity control system and method for testing a hydrogen fuel cell stack are implemented.

[0089] According to the present invention, the gas humidification efficiency is significantly improved compared with the traditional gas humidification method; the gas humidification is more uniform; the structure is simple, the manufacturing cost is low, and the control method is simple.

Claims

1. A gas temperature and humidity control system for hydrogen fuel cell stack testing, characterized in that, a ventilation main pipeline equipped with a pneumatic angle seat valve and sensors passes gas into a humidifier, and the gas is air or hydrogen, the mass flow controller is used to control the gas flow rate before entering the humidifier, the pneumatic angle seat valve and sensors are used to control and adjust the gas pressure and temperature before entering the humidifier, the gas that meets the pressure and temperature requirements after control and adjustment enters the humidifier through the ventilation main pipeline, and the ventilation main pipeline is also connected to a high-level water tank, a water pipeline equipped with a solenoid valve and a check valve passes humidifying water - that is, deionized water - into the water tank, and the water in the water tank flows out to a heating water tank, after the deionized water is heated by a heater in the heating water tank, the temperature control, adjustment and pressurization of the deionized water are realized through a plate heat exchanger, and the heated and pressurized deionized water is pumped into the humidifier by a water pump; the gas that meets the pressure, temperature and humidity control requirements after humidification in the humidifier is passed into the hydrogen fuel cell stack, and the deionized water returns to the water tank.

2. The gas temperature and humidity control system for hydrogen fuel cell stack testing according to claim 1, characterized in that, a pneumatic angle seat valve is provided in the ventilation main pipeline before the gas enters the humidifier. Before the gas enters the humidifier, a bypass of the ventilation main pipeline is connected to the high-level water tank to balance the pressure of the gas and deionized water pipelines and prevent damage to the humidifier due to unbalanced pressure.

3. The gas temperature and humidity control system for hydrogen fuel cell stack testing according to claim 1, characterized in that, the mass flow controller is used to control the gas flow rate before entering the humidifier, and the gas flow rate is controlled in the range of 100 SLPM to 7000 SLPM, and the accuracy meets ±1%value±0.5%F.S.

4. The gas temperature and humidity control system for hydrogen fuel cell stack testing according to claim 1, characterized in that, the pressure range after controlling the gas pressure before entering the humidifier through the pneumatic angle seat valve and sensors is: 260Kpa±1Kpa; the control and adjustment range of the gas temperature before entering the humidifier is: 10℃~60℃, and the accuracy meets ±1.5℃.

5. The gas temperature and humidity control system for hydrogen fuel cell stack testing according to claim 1, characterized in that, the water temperature of the deionized water before entering the humidifier after being heated by the heater in the heating water tank is controlled at 80℃±1 degree.

6. The gas temperature and humidity control system for hydrogen fuel cell stack testing according to claim 1, characterized in that, the deionized water is pressurized before entering the humidifier, so that the pressure of the deionized water after pressurization and entering the humidifier is 10Kpa lower than the gas pressure before entering the humidifier, that is: the pressure of the deionized water after pressurization is 250Kpa±1Kpa.

7. A gas temperature and humidity control method for hydrogen fuel cell stack testing, characterized in that, a ventilation main pipeline equipped with a pneumatic angle seat valve and sensors passes gas into a humidifier, the mass flow controller is used to control the gas flow rate before entering the humidifier, the pneumatic angle seat valve and sensors are used to control and adjust the gas pressure and temperature before entering the humidifier, The gas that meets the pressure and temperature requirements after control adjustment enters the humidifier through the main ventilation pipeline. The main ventilation pipeline is also connected to a high-level water tank. Through the water pipeline equipped with a solenoid valve and a check valve, the humidifying water - that is, deionized water - is introduced into the water tank. The water in the water tank flows out to the heating water tank. After the deionized water is heated by a heater in the heating water tank, the temperature control, adjustment, and pressurization of the deionized water are realized through a plate heat exchanger. The heated and pressurized deionized water is pumped into the humidifier by a water pump. The gas that meets the pressure, temperature, and humidity control requirements after humidification in the humidifier is introduced into the hydrogen fuel cell stack, and the deionized water returns to the water tank.

8. The method for controlling the temperature and humidity of the gas used in the test of a hydrogen fuel cell stack as described in claim 7. It is characterized in that A pneumatic angle seat valve is provided in the main ventilation pipeline before the gas enters the humidifier. Before the gas enters the humidifier, there is a bypass in the main ventilation pipeline that is connected to the high-level water tank to balance the pressure of the gas and the deionized water pipeline and prevent damage to the humidifier due to unbalanced pressure.

9. The method for controlling the temperature and humidity of the gas used in the test of a hydrogen fuel cell stack as described in claim 7. It is characterized in that The gas flow before entering the humidifier is controlled by a mass flow controller. The gas flow is controlled within the range of 100 SLPM to 7000 SLPM, and the accuracy meets ±1%value±0.5%F.S.

10. The method for controlling the temperature and humidity of the gas used in the test of a hydrogen fuel cell stack as described in claim 7. It is characterized in that The pressure range after controlling the gas pressure before entering the humidifier through a pneumatic angle seat valve and a sensor is: 260Kpa±1Kpa; The gas temperature before entering the humidifier is controlled, and the control range is: 10℃ to 60℃, and the accuracy meets ±1.5℃.

11. The method for controlling the temperature and humidity of the gas used in the test of a hydrogen fuel cell stack as described in claim 7. It is characterized in that The water temperature of the deionized water before entering the humidifier after being heated by the heater in the heating water tank is controlled to 80℃±1 degree.

12. The method for controlling the temperature and humidity of the gas used in the test of a hydrogen fuel cell stack as described in claim 7. It is characterized in that The deionized water is pressurized before entering the humidifier, so that the pressure of the deionized water after pressurization is 10Kpa lower than the pressure of the gas before entering the humidifier. That is: the pressure of the deionized water after pressurization is 250Kpa±1Kpa.

13. The method for controlling the temperature and humidity of the gas used in the test of a hydrogen fuel cell stack as described in claim 7. It is characterized in that The gas and the deionized water enter the humidifier simultaneously. While the gas is humidified by the deionized water in the humidifier, the temperature of the gas is heated to 60±1.5℃ to ensure that the temperature of the humidified gas meets the test change requirements of different test pieces.

14. The method for controlling the temperature and humidity of the gas used in the test of a hydrogen fuel cell stack as described in claim 7. It is characterized in that The pressure of the humidified gas is controlled by a pneumatic angle seat valve, and the pressure is controlled within the range of 260±1Kpa, and then it enters the hydrogen fuel cell stack.

15. The method for controlling the temperature and humidity of the gas used in the test of a hydrogen fuel cell stack as described in claim 7. It is characterized in that When starting up and running, first pass the gas, open the pneumatic angle seat valve of the main gas pipeline and the pneumatic angle seat valve of the bypass of the main gas pipeline. The gas pressure is transmitted to the water side of the membrane humidifier through deionized water to achieve pressure balance on both sides of the membrane humidifier, and then start the water pump to provide humidifying water for the gas. When shutting down and running, first close the water pump and then close the gas valve to achieve real-time pressure balance.

16. A method for controlling the temperature and humidity of gas for testing a hydrogen fuel cell stack as described in claim 7, characterized in that, The main gas pipeline is connected to the high-level water tank of deionized water and pressure monitoring is carried out: always ensure that the pressure of deionized water after pressurization before entering the humidifier is 10 Kpa less than the gas pressure before entering the humidifier, that is, the pressure of deionized water is: 250 Kpa ± 1 Kpa, and the gas pressure is: 260 Kpa ± 1 Kpa. Thus, pressure balance between the main gas pipeline and the deionized water pipeline can be achieved, ultimately meeting the gas humidification requirements, and at the same time preventing damage to the humidifier caused by uneven pressure in the gas path and the water path.

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