An integrated application system of water electrolysis oxygen production and fuel cell

Abstract

The application provides a comprehensive application system integrating water electrolysis oxygen production and fuel cells, and belongs to the technical field of fuel cells, and solves the problem of low system efficiency and air recycling failure caused by the failure of effectively utilizing water electrolysis oxygen production in the prior art. The system comprises a stack, an electrolytic tank, an air compressor, a humidifier, a first gas-liquid separation tank, a second gas-liquid separation tank, a heat exchanger, a first three-way valve, a second three-way valve and a third three-way valve. The oxygen outlet of the electrolytic tank is connected with the inlet of the first gas-liquid separation tank. The input end of the first three-way valve is connected with the gas outlet of the first gas-liquid separation tank, one output end of the first three-way valve is connected with the inlet of the second gas-liquid separation tank through the heat exchanger, and the other output end of the first three-way valve is connected with the input end one of the second three-way valve. The input end two of the second three-way valve is connected with the gas outlet of the second gas-liquid separation tank, and the output end of the second three-way valve is connected with the input end two of the third three-way valve. The input end one of the third three-way valve is connected with the air compressor, and the output end of the third three-way valve is connected with the stack through the humidifier. The system can reduce the power consumption of the fuel cell by utilizing water electrolysis oxygen production.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and in particular to a comprehensive application system that integrates water electrolysis for oxygen production and a fuel cell. Background Technology

[0002] In the field of new energy, hydrogen energy has attracted much attention as a clean and efficient energy form. Electrolyzers, as key equipment for hydrogen production through water electrolysis, are highly efficient and environmentally friendly, and are widely used in energy transition and energy storage.

[0003] To achieve higher hydrogen production and energy utilization efficiency, electrolyzers are often used in conjunction with fuel cells, as seen in Chinese patents CN109995081A and CN116219448A. However, there is no scheme linking water electrolysis for oxygen production with fuel cells. Most of the oxygen generated by the electrolyzer is directly discharged, and its utilization is unrelated to the fuel cell.

[0004] Fuel cells rely solely on oxygen from the air for oxygen supply. The high-pressure, high-flow-rate air requirement becomes the largest contributor to the power consumption of the fuel cell system, with the air compressor accounting for 80% of the auxiliary system's power consumption, severely impacting system efficiency. Furthermore, because the oxygen produced from water electrolysis for hydrogen production is not fully utilized, the oxygen concentration in the air path cannot be regulated, and the compressed air temperature is relatively high, requiring an additional intercooler to cool the feed air, further reducing system efficiency. Moreover, the air cannot be recycled. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a comprehensive application system integrating water electrolysis for oxygen production and fuel cells, in order to solve the problem that the existing technology fails to effectively utilize water electrolysis for oxygen production, resulting in low overall system efficiency and the inability to recycle air.

[0006] On one hand, embodiments of the present invention provide an integrated application system combining water electrolysis for oxygen production and a fuel cell, including a fuel cell stack, an electrolyzer, an air compressor, a humidifier, a first gas-liquid separator, a second gas-liquid separator, a heat exchanger, and adjustable-opening first three-way valves, second three-way valves, and third three-way valves; wherein,

[0007] The oxygen outlet of the electrolyzer is connected to the inlet of the first gas-liquid separator, and its deionized water inlet is connected to the outlet of the first gas-liquid separator and the second gas-liquid separator, respectively.

[0008] The input end of the first three-way valve is connected to the outlet of the first gas-liquid separator, and its output end one is connected to the inlet of the second gas-liquid separator via a heat exchanger. Its output end two is connected to the input end one of the second three-way valve.

[0009] The second three-way valve has its input end 2 connected to the outlet of the second gas-liquid separator, and its output end connected to the input end 2 of the third three-way valve.

[0010] The input end of the third three-way valve is connected to the air compressor, and its output end is connected to the fuel cell stack after passing through the humidifier.

[0011] The beneficial effects of the above technical solution are as follows: It links the oxygen consumption and supply of the electrolyzer and fuel cell, achieving efficient oxygen utilization. The oxygen generated from water electrolysis in the electrolyzer is moist and has a temperature between 60℃ and 80℃. After gas-liquid separation and heat exchange, the oxygen emission temperature can reach 25℃. Supplying the oxygen generated from water electrolysis to the fuel cell on demand increases air humidity, reduces air temperature, and increases oxygen concentration, effectively improving the efficiency of the fuel cell system. Furthermore, it reduces the power consumption of the air compressor and eliminates the need for an intercooler in the fuel cell system, allowing for adjustments to system efficiency based on demand.

[0012] Based on further improvements to the aforementioned system, this integrated application system also includes an oxygen concentration sensor and a gas temperature sensor located at the air inlet of the fuel cell stack; among which,

[0013] An oxygen concentration sensor is used to obtain the oxygen concentration of the feed air, which serves as an adjustment index for the opening of the third three-way valve, so that the oxygen concentration sensor data can reach the target oxygen concentration of the feed air by adjusting the opening of the third three-way valve.

[0014] A gas temperature sensor is used to obtain the temperature of the gas entering the reactor, which serves as an indicator for adjusting the opening of the second three-way valve, so that the gas temperature sensor data reaches the target temperature of the air entering the reactor through the adjustment of the opening of the second three-way valve.

[0015] Furthermore, the integrated application system also includes a controller; wherein the controller executes the following program:

[0016] After starting the electrolyzer and fuel cell, obtain the target oxygen concentration and target temperature of the fuel cell feed air.

[0017] Oxygen concentration sensor data is acquired periodically, and the opening of the third three-way valve is adjusted in real time based on the oxygen concentration sensor data until the oxygen concentration sensor data reaches the target oxygen concentration of the influent air, at which point the adjustment of the opening of the third three-way valve ends.

[0018] The gas temperature sensor data is acquired periodically, and the opening of the second three-way valve is adjusted in real time according to the gas temperature sensor data until the gas temperature sensor data reaches the target temperature of the inlet air, at which point the adjustment of the opening of the second three-way valve ends.

[0019] The electrolyzer and fuel cell will continue to operate until the integrated application system is shut down.

[0020] Furthermore, this integrated application system also includes an air circulation valve with adjustable opening; and,

[0021] The humidifier is a membrane tube humidifier; the dry side gas inlet of the humidifier is connected to the output end of the third three-way valve and the air circulation valve, respectively; its dry side gas outlet is connected to the air inlet of the fuel cell stack; its wet side gas inlet is connected to the air exhaust outlet of the fuel cell stack; and its wet side gas outlet is connected to the input end of the air circulation valve.

[0022] Furthermore, the first three-way valve, the second three-way valve, and the third three-way valve are all electrically controlled three-way valves, while the air circulation circuit valves are electrically controlled check valves; and...

[0023] The integrated application system also includes a first solenoid valve and a second solenoid valve; the outlet of the first gas-liquid separator is also connected to the atmosphere via the first solenoid valve as a bypass branch, and the outlet of the second gas-liquid separator is also connected to the atmosphere via the second solenoid valve as a bypass branch.

[0024] Furthermore, the controller also executes the following program:

[0025] When a request to reduce the oxygen concentration in the feed air is received while the electrolyzer and fuel cell are running continuously, the target oxygen concentration in the feed air is reset according to the request.

[0026] Open the air circulation valve and retrieve the oxygen concentration sensor data again;

[0027] The opening of the third three-way valve is adjusted in real time based on the oxygen concentration sensor data until the oxygen concentration sensor data reaches the reset target oxygen concentration of the influent air, at which point the adjustment of the opening of the third three-way valve ends.

[0028] The gas temperature sensor data is acquired again, and the opening of the second three-way valve is adjusted in real time based on the gas temperature sensor data until the gas temperature sensor data reaches the target temperature of the inlet air, at which point the adjustment of the opening of the second three-way valve ends.

[0029] Furthermore, the gas temperature at the output end of the first three-way valve is 60–80°C, and the gas temperature at the output end of the second three-way valve is 20–30°C.

[0030] Furthermore, this integrated application system also includes a third solenoid valve; among which,

[0031] The third solenoid valve is used to close when the fuel cell is started but the electrolyzer is not started, and to open when both the fuel cell and the electrolyzer are started.

[0032] The input terminal of the third solenoid valve is connected to the output terminal of the second three-way valve, its output terminal is connected to the input terminal of the third three-way valve, and its control terminal is connected to the output terminal of the controller.

[0033] Furthermore, the integrated application system also includes oxygen status monitoring equipment; among which,

[0034] The input terminal of the oxygen status monitoring device is connected to the output terminal of the second three-way valve to monitor and display the oxygen concentration, oxygen humidity, and oxygen pressure output by the second three-way valve.

[0035] Furthermore, this integrated application system also includes an air circulation pump and a filter, among which,

[0036] The input end of the air circulation pump is connected to the air circulation circuit valve, its output end is connected to the dry side gas inlet of the humidifier, and its control end is connected to the controller.

[0037] The filter is located at the gas inlet of the air compressor and is used to filter dust from the air.

[0038] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify essential or essential features of the invention, nor is it intended to limit the scope of the invention. Attached Figure Description

[0039] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same parts.

[0040] Figure 1 A schematic diagram of the integrated application system combining water electrolysis for oxygen production and a fuel cell is shown in Example 1.

[0041] Figure 2 A schematic diagram of the integrated application system structure of water electrolysis oxygen production and fuel cell in Example 2 is shown;

[0042] Figure 3 A schematic diagram of the closed-loop control strategy of the integrated application system in Embodiment 2 is shown. Detailed Implementation

[0043] Embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0044] The term "comprising" and its variations as used herein signify open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc., may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0045] Example 1

[0046] One embodiment of the present invention discloses a comprehensive application system integrating water electrolysis for oxygen production and a fuel cell, such as... Figure 1 As shown, it includes an electric stack, an electrolytic cell, an air compressor, a humidifier, a first gas-liquid separator, a second gas-liquid separator, a heat exchanger, and a first three-way valve, a second three-way valve, and a third three-way valve with adjustable opening.

[0047] The oxygen outlet of the electrolyzer is connected to the inlet of the first gas-liquid separator, and its deionized water inlet is connected to the outlets of the first and second gas-liquid separators, respectively, so that oxygen enters the fuel cell stack and excess water vapor flows back into the electrolyzer.

[0048] The input end of the first three-way valve is connected to the outlet of the first gas-liquid separator, and its output end one is connected to the inlet of the second gas-liquid separator via a heat exchanger. Its output end two is connected to the input end one of the second three-way valve.

[0049] The second three-way valve's input terminal 2 is connected to the outlet of the second gas-liquid separator, and its output terminal is connected to the input terminal 2 of the third three-way valve. Adjusting the opening degree of either the first or second three-way valve allows for control of the oxygen temperature.

[0050] The input end of the third three-way valve is connected to the air compressor, and its output end is connected to the fuel cell stack after passing through the humidifier.

[0051] During implementation, the opening of the first and second three-way valves is adjusted according to the target oxygen concentration of the feed air. The oxygen outlet (output end one, output end two) temperature of the first three-way valve is approximately 60–80°C, while the oxygen outlet (output end) temperature of the second three-way valve can be around 25°C. The oxygen generated in the electrolytic cell passes through gas-liquid separators (first gas-liquid separator, second gas-liquid separator) and a heat exchanger, generating two oxygen streams, which can be controlled according to system requirements.

[0052] Compared to existing technologies, the integrated water electrolysis oxygen production and fuel cell system provided in this embodiment links the electrolyzer and fuel cell in terms of oxygen consumption and supply, achieving efficient oxygen utilization. The oxygen generated from water electrolysis in the electrolyzer is moist and has a temperature between 60°C and 80°C. After gas-liquid separation and heat exchange, the oxygen discharge temperature can reach 25°C. Supplying the oxygen generated from water electrolysis to the fuel cell on demand increases air humidity, reduces air temperature, and increases oxygen concentration, effectively improving the efficiency of the fuel cell system. Furthermore, it reduces the power consumption of the air compressor and eliminates the need for an intercooler in the fuel cell system, allowing for adjustments to system efficiency based on demand.

[0053] Example 2

[0054] Based on Example 1, the integrated application system is further improved by including an oxygen concentration sensor and a gas temperature sensor located at the air inlet of the fuel cell stack.

[0055] An oxygen concentration sensor is used to obtain the oxygen concentration of the feed air, which serves as an adjustment indicator for the opening of the third three-way valve, so that the oxygen concentration sensor data reaches the target oxygen concentration of the feed air by adjusting the opening of the third three-way valve.

[0056] A gas temperature sensor is used to obtain the temperature of the gas entering the reactor, which serves as an indicator for adjusting the opening of the second three-way valve, so that the gas temperature sensor data reaches the target temperature of the air entering the reactor through the adjustment of the opening of the second three-way valve.

[0057] Preferably, the integrated application system also includes an air circulation valve with adjustable opening, such as... Figure 2 As shown. Furthermore, the humidifier is a membrane tube humidifier. The dry-side gas inlet of this humidifier is connected to the output terminals of the third three-way valve and the air circulation valve, respectively. Its dry-side gas outlet is connected to the air inlet of the fuel cell stack, its wet-side gas inlet is connected to the air exhaust outlet of the fuel cell stack, and its wet-side gas outlet is connected to the input terminal of the air circulation valve.

[0058] Preferably, the integrated application system further includes a controller. For example, Figure 3 As shown but not limited to Figure 3 Within the range shown, the controller executes the following procedure to perform the control function of the infeed air:

[0059] S1. After starting the electrolyzer and fuel cell, obtain the target oxygen concentration and target temperature of the fuel cell feed air;

[0060] S2. Periodically acquire oxygen concentration sensor data, and adjust the opening of the third three-way valve in real time according to the oxygen concentration sensor data until the oxygen concentration sensor data reaches the target oxygen concentration of the influent air, and then end the adjustment of the opening of the third three-way valve.

[0061] S3. Periodically acquire gas temperature sensor data, and adjust the opening of the second three-way valve in real time according to the gas temperature sensor data until the gas temperature sensor data reaches the target temperature of the inlet air, and then stop adjusting the opening of the second three-way valve.

[0062] S4. Continue operating the electrolyzer and fuel cell until the integrated application system is shut down.

[0063] Preferably, the first three-way valve, the second three-way valve, and the third three-way valve are all electrically controlled three-way valves, and the air circulation valve is an electrically controlled one-way valve.

[0064] Preferably, the integrated application system further includes a first solenoid valve and a second solenoid valve. The outlet of the first gas-liquid separator is also connected to the atmosphere via the first solenoid valve as a bypass branch, and the outlet of the second gas-liquid separator is also connected to the atmosphere via the second solenoid valve as a bypass branch.

[0065] Preferably, the controller also executes the following program to reduce the oxygen concentration of the incoming air during continuous operation:

[0066] S5. When a request to reduce the oxygen concentration of the feed air is received while the electrolyzer and fuel cell are running continuously, the target oxygen concentration of the feed air is reset according to the request;

[0067] S6. Open the air circulation valve and obtain oxygen concentration sensor data again;

[0068] S7. Adjust the opening of the third three-way valve in real time according to the oxygen concentration sensor data until the oxygen concentration sensor data reaches the reset target oxygen concentration of the influent air, and then end the adjustment of the opening of the third three-way valve.

[0069] S8. Acquire gas temperature sensor data again, and adjust the opening of the second three-way valve in real time according to the gas temperature sensor data until the gas temperature sensor data reaches the target temperature of the incoming air, and then end the adjustment of the opening of the second three-way valve.

[0070] Preferably, the gas temperature at the output end of the first three-way valve is 60-80°C, and the gas temperature at the output end of the second three-way valve is 20-30°C.

[0071] Preferably, the integrated application system further includes a third solenoid valve. This third solenoid valve is used to close when the fuel cell is started but the electrolyzer is not started, and to open when both the fuel cell and the electrolyzer are started.

[0072] The input terminal of the third solenoid valve is connected to the output terminal of the second three-way valve, its output terminal is connected to the input terminal of the third three-way valve, and its control terminal is connected to the output terminal of the controller.

[0073] Preferably, the integrated application system further includes an oxygen status monitoring device. The input end of the oxygen status monitoring device is connected to the output end of the second three-way valve, and it is used to monitor and display the oxygen concentration, oxygen humidity, and oxygen pressure output by the second three-way valve.

[0074] Preferably, the integrated application system also includes an air circulation pump and a filter.

[0075] The input end of the air circulation pump is connected to the air circulation circuit valve, its output end is connected to the dry side gas inlet of the humidifier, and its control end is connected to the controller.

[0076] The filter is located at the gas inlet of the air compressor and is used to filter dust from the air.

[0077] Compared with existing technologies, the integrated application system of water electrolysis oxygen production and fuel cell provided in this embodiment has the following beneficial effects:

[0078] 1. The oxygen generated in the electrolyzer can be supplied to the fuel cell at controlled temperatures and concentrations according to actual needs (target oxygen concentration and target temperature of the feed air). Oxygen supply to the fuel cell can be achieved by directly supplying oxygen, thus improving the system efficiency of the fuel cell.

[0079] 2. The oxygen concentration of the fuel cell is controlled by adjusting the opening of three three-way valves, directly supplying oxygen without the need for joint supply with hydrogen produced by the electrolyzer. The oxygen generated by the electrolyzer has humidity and a suitable temperature, which, for the fuel cell, increases air humidity, decreases air temperature, and also increases oxygen concentration.

[0080] 3. This system design incorporates oxygen circulation valves to optimize oxygen utilization. Closed-loop control of oxygen concentration balances the fuel cell's air temperature and oxygen concentration requirements with the oxygen produced by electrolysis in the electrolyzer. Oxygen is supplied to the fuel cell on demand; this increased oxygen concentration effectively improves the fuel cell system efficiency, altering the previously unchangeable air oxygen concentration, reducing the need for an intercooler in the fuel cell air path, and decreasing system power consumption.

[0081] 4. The air compressor only needs to provide a small flow rate of high-pressure air, which greatly reduces its power consumption. Therefore, by reducing the power consumption of the air compressor and eliminating the need for the intercooler in the fuel cell, system efficiency can be improved as needed.

[0082] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or improvements to the prior art of the embodiments, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A comprehensive application system integrating water electrolysis for oxygen production and a fuel cell, characterized in that, It includes an electric fuel cell stack, an electrolytic cell, an air compressor, a humidifier, a first gas-liquid separator, a second gas-liquid separator, a heat exchanger, and three adjustable three-way valves (first, second, and third); among which, The oxygen outlet of the electrolyzer is connected to the inlet of the first gas-liquid separator, and its deionized water inlet is connected to the outlet of the first gas-liquid separator and the second gas-liquid separator, respectively. The input end of the first three-way valve is connected to the outlet of the first gas-liquid separator, and its output end one is connected to the inlet of the second gas-liquid separator via a heat exchanger. Its output end two is connected to the input end one of the second three-way valve. The second three-way valve has its input end 2 connected to the outlet of the second gas-liquid separator, and its output end connected to the input end 2 of the third three-way valve. The input end of the third three-way valve is connected to the air compressor, and its output end is connected to the fuel cell stack after passing through the humidifier. The opening of the first three-way valve and the second three-way valve is adjusted based on the target oxygen concentration of the incoming air. The oxygen generated by the electrolyzer passes through the first gas-liquid separator, the second gas-liquid separator, and the heat exchanger to generate two streams of oxygen. The oxygen is regulated and supplied to the fuel cell on demand based on system requirements in order to increase air humidity, reduce air temperature, and increase oxygen concentration.

2. The integrated application system for water electrolysis oxygen production and fuel cell as described in claim 1, characterized in that, It also includes an oxygen concentration sensor and a gas temperature sensor located at the air inlet of the fuel cell stack; among which, An oxygen concentration sensor is used to obtain the oxygen concentration of the feed air, which serves as an adjustment index for the opening of the third three-way valve, so that the oxygen concentration sensor data can reach the target oxygen concentration of the feed air by adjusting the opening of the third three-way valve. A gas temperature sensor is used to obtain the temperature of the gas entering the reactor, which serves as an indicator for adjusting the opening of the second three-way valve, so that the gas temperature sensor data reaches the target temperature of the air entering the reactor through the adjustment of the opening of the second three-way valve.

3. The integrated application system of water electrolysis oxygen production and fuel cell according to claim 2, characterized in that, It also includes a controller; wherein the controller executes the following program: After starting the electrolyzer and fuel cell, obtain the target oxygen concentration and target temperature of the fuel cell feed air. Oxygen concentration sensor data is acquired periodically, and the opening of the third three-way valve is adjusted in real time based on the oxygen concentration sensor data until the oxygen concentration sensor data reaches the target oxygen concentration of the influent air, at which point the adjustment of the opening of the third three-way valve ends. The gas temperature sensor data is acquired periodically, and the opening of the second three-way valve is adjusted in real time according to the gas temperature sensor data until the gas temperature sensor data reaches the target temperature of the inlet air, at which point the adjustment of the opening of the second three-way valve ends. The electrolyzer and fuel cell will continue to operate until the integrated application system is shut down.

4. The integrated application system for water electrolysis oxygen production and fuel cell as described in claim 3, characterized in that, It also includes an air recirculation valve with adjustable opening; and, The humidifier is a membrane tube humidifier; the dry side gas inlet of the humidifier is connected to the output end of the third three-way valve and the air circulation valve, respectively; its dry side gas outlet is connected to the air inlet of the fuel cell stack; its wet side gas inlet is connected to the air exhaust outlet of the fuel cell stack; and its wet side gas outlet is connected to the input end of the air circulation valve.

5. The integrated application system of water electrolysis oxygen production and fuel cell according to claim 4, characterized in that, The first three-way valve, the second three-way valve, and the third three-way valve are all electrically controlled three-way valves, while the air circulation valves are electrically controlled one-way valves; furthermore... The integrated application system also includes a first solenoid valve and a second solenoid valve; the outlet of the first gas-liquid separator is also connected to the atmosphere via the first solenoid valve as a bypass branch, and the outlet of the second gas-liquid separator is also connected to the atmosphere via the second solenoid valve as a bypass branch.

6. The integrated application system of water electrolysis oxygen production and fuel cell according to claim 4 or 5, characterized in that, The controller also executes the following programs: When a request to reduce the oxygen concentration in the feed air is received while the electrolyzer and fuel cell are running continuously, the target oxygen concentration in the feed air is reset according to the request. Open the air circulation valve and retrieve the oxygen concentration sensor data again; The opening of the third three-way valve is adjusted in real time based on the oxygen concentration sensor data until the oxygen concentration sensor data reaches the reset target oxygen concentration of the influent air, at which point the adjustment of the opening of the third three-way valve ends. The gas temperature sensor data is acquired again, and the opening of the second three-way valve is adjusted in real time based on the gas temperature sensor data until the gas temperature sensor data reaches the target temperature of the inlet air, at which point the adjustment of the opening of the second three-way valve ends.

7. The integrated application system of water electrolysis oxygen production and fuel cell according to claim 6, characterized in that, The gas temperature at the output end of the first three-way valve is 60~80 ℃, and the gas temperature at the output end of the second three-way valve is 20~30 ℃.

8. The integrated application system for water electrolysis oxygen production and fuel cell as described in claim 7, characterized in that, It also includes a third solenoid valve; among which, The third solenoid valve is used to close when the fuel cell is started but the electrolyzer is not started, and to open when both the fuel cell and the electrolyzer are started. The input terminal of the third solenoid valve is connected to the output terminal of the second three-way valve, its output terminal is connected to the input terminal of the third three-way valve, and its control terminal is connected to the output terminal of the controller.

9. The integrated application system of water electrolysis oxygen production and fuel cell according to claim 7 or 8, characterized in that, It also includes oxygen status monitoring equipment; among which, The input terminal of the oxygen status monitoring device is connected to the output terminal of the second three-way valve to monitor and display the oxygen concentration, oxygen humidity, and oxygen pressure output by the second three-way valve.

10. The integrated application system for water electrolysis oxygen production and fuel cell according to claim 9, characterized in that, It also includes an air circulation pump and a filter, among which, The input end of the air circulation pump is connected to the air circulation circuit valve, its output end is connected to the dry side gas inlet of the humidifier, and its control end is connected to the controller. The filter is located at the gas inlet of the air compressor and is used to filter dust from the air.

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