Hydrogen fuel cell combined power generation system based on high-pressure hydrogen and oxygen and control method

Abstract

The invention discloses a hydrogen fuel cell combined power generation system based on high-pressure hydrogen and oxygen and a control method, and the system comprises an oxygen path conveying subsystem which is configured to convey high-pressure pure oxygen to a cathode of a fuel cell system through a first ejector, introduce external air and mix the high-pressure pure oxygen at an outlet of the first ejector, the proportion of the oxygen content in the mixed gas is regulated and controlled in real time according to the front-end pressure change; and the hydrogen path conveying subsystem is configured to convey high-pressure pure hydrogen to the anode of the fuel cell system through a second ejector and enable the hydrogen, not participating in reaction, of the anode of the fuel cell system to be circulated, and the metering ratio of the mixed hydrogen is regulated and controlled in real time according to the front-end pressure change. According to the system, high-pressure pure hydrogen and high-pressure oxygen are efficiently utilized in an injection mode, an original air compressor and an original hydrogen circulating pump are replaced, too high energy consumption loss is converted into higher power generation power, and the overall cost of the system is reduced to a certain degree.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a hydrogen fuel cell combined power generation system based on high-pressure hydrogen and oxygen and a control method. Background Art

[0002] Proton exchange membrane fuel cell is a power generation device that can convert the chemical energy rich in fuel gas into electrical energy. Due to its low operating temperature, high conversion efficiency and green and clean products, it is widely used in the automotive and power generation fields.

[0003] Usually, the hydrogen source of the anode fuel gas generally comes from high-pressure green hydrogen produced by electrolysis of water, and its byproduct, high-pressure pure oxygen, is generally discharged directly into the atmosphere, resulting in a huge waste of resources; in addition, the cathode and anode of the fuel cell generally use air compressors and hydrogen circulation pumps to transport hydrogen and oxygen. This method not only increases the overall energy consumption of the system and reduces the power generation efficiency, but also the performance of the system in high-altitude areas will be significantly fluctuated by the instability of the oxygen content in the air.

[0004] Considering the efficiency requirements of the power generation system, it is urgent to establish a comprehensive energy supply system with high gas source utilization, low energy consumption and high efficiency. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a hydrogen fuel cell combined power generation system and control method based on high-pressure hydrogen and oxygen. Through a single-stage or multi-stage ejector, the original high-energy consumption air compressor and hydrogen circulation pump are replaced, and the high-pressure pure oxygen and high-pressure pure hydrogen at the front end can be efficiently utilized.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A hydrogen fuel cell combined power generation system based on high-pressure hydrogen and oxygen, comprising:

[0008] The oxygen path delivery subsystem is configured to input high-pressure pure oxygen to the first ejector and introduce external air to mix at the outlet of the first ejector. The proportion of oxygen content in the mixed gas is adjusted in real time according to the change of the front-end pressure, and the mixed gas will be delivered to the cathode of the fuel cell system;

[0009] The hydrogen gas transport subsystem is configured to input high-pressure pure hydrogen into the second ejector and mix it with the unreacted hydrogen at the anode of the fuel cell system at the outlet of the second ejector. The metering ratio of the mixed hydrogen is adjusted in real time according to the front-end pressure change, and the mixed gas will be transported to the anode of the fuel cell system.

[0010] Further, the oxygen path delivery subsystem includes a first electromagnetic shut-off valve, a first pressure regulating valve, a first pressure sensor, a second electromagnetic shut-off valve, a first proportional valve, a second proportional valve, an air filter, a first temperature and pressure sensor, a first humidity sensor, a first ejector, a second humidity sensor, and a second temperature and pressure sensor, wherein:

[0011] The first electromagnetic shut-off valve, the first pressure regulating valve, the first pressure sensor, the second electromagnetic shut-off valve, the first proportional valve and the first ejector are connected in sequence, the air inlet end of the first electromagnetic shut-off valve inputs high-pressure pure oxygen, the second proportional valve is connected in parallel with the first proportional valve, the output end of the first ejector is connected to the cathode air inlet end of the fuel cell system, and the second humidity sensor and the second temperature and pressure sensor are arranged on the pipeline between the first ejector and the fuel cell system;

[0012] The air inlet end of the air filter inputs air, and the air outlet end is connected to the air input end of the first ejector. The first temperature and pressure sensor and the first humidity sensor are arranged on the air inlet end pipeline of the air filter.

[0013] Furthermore, for the oxygen path transport subsystem, when the operating power of the fuel cell system is less than the first preset power W1, the second electromagnetic shut-off valve and the first proportional valve are opened, and single-stage injection is adopted; when the operating power of the fuel cell system is greater than the first preset power W1, the second electromagnetic shut-off valve, the first proportional valve and the second proportional valve are opened at the same time, and multi-stage injection is adopted.

[0014] Furthermore, the method of transporting high-pressure pure oxygen through an ejector requires the introduction of external air, and the external air is mixed with the high-pressure pure oxygen at the outlet of the first ejector through an air filter. The proportion of oxygen content in the mixed gas is calculated based on the parameters obtained by the first pressure sensor, the first humidity sensor, the first temperature and pressure sensor, the second humidity sensor and the second temperature and pressure sensor, and the proportion of oxygen content in the mixed gas is controlled by adjusting the first pressure regulating valve.

[0015] Furthermore, the oxygen path transport subsystem also includes a buffer tank, which is arranged at the high-pressure pure oxygen outlet.

[0016] Further, the hydrogen gas transport subsystem includes a third temperature and pressure sensor, a third humidity sensor, a third proportional valve, a fourth humidity sensor, a fourth temperature and pressure sensor, a steam-water separator, a drain valve, a second ejector, a fourth proportional valve, a second pressure sensor, a third electromagnetic shut-off valve, a fourth electromagnetic shut-off valve and a second pressure regulating valve, wherein:

[0017] The fourth electromagnetic shut-off valve, the second pressure regulating valve, the second pressure sensor, the third electromagnetic shut-off valve, the third proportional valve and the second ejector are connected in sequence, the air inlet end of the fourth electromagnetic shut-off valve inputs high-pressure pure hydrogen, the fourth proportional valve is connected in parallel with the third proportional valve, the output end of the second ejector is connected to the anode air inlet end of the fuel cell system, and the third temperature and pressure sensor and the third humidity sensor are arranged on the pipeline between the second ejector and the fuel cell system;

[0018] The fourth humidity sensor and the fourth temperature and pressure sensor are arranged on the pipeline between the steam-water separator and the second ejector. The input end of the steam-water separator is connected to the anode exhaust end of the fuel cell system, and the exhaust end is connected to the hydrogen input end of the second ejector, and the drain end is connected to the drain valve.

[0019] Furthermore, for the hydrogen gas transport subsystem, when the operating power of the fuel cell system is less than the second preset power W2, the third electromagnetic shut-off valve and the third proportional valve are opened, and single-stage injection is adopted; when the operating power of the fuel cell system is greater than the second preset power W2, the third electromagnetic shut-off valve, the third proportional valve and the fourth proportional valve are opened, and multi-stage injection is adopted.

[0020] Furthermore, the high-pressure pure hydrogen is transported through the ejector, which will cause the hydrogen that does not participate in the reaction at the anode of the fuel cell system to circulate, and the stoichiometric ratio of the mixed hydrogen is calculated based on the parameters obtained by the third temperature and pressure sensor, the third humidity sensor, the fourth humidity sensor and the fourth temperature and pressure sensor, and the stoichiometric ratio of the anode of the fuel cell system is controlled by adjusting the second pressure regulating valve.

[0021] Furthermore, the hydrogen gas transport subsystem also includes a buffer tank, which is arranged at the high-pressure pure hydrogen outlet.

[0022] A method for controlling combined power generation of a hydrogen fuel cell based on high-pressure hydrogen and oxygen, comprising:

[0023] High-pressure pure oxygen is input through the first ejector, and external air is introduced at the outlet of the first ejector for mixing. The proportion of oxygen content in the mixed gas is adjusted in real time according to the change of the front-end pressure, and the mixed gas will be transported to the cathode of the fuel cell system;

[0024] High-pressure pure hydrogen is input through the second ejector, and the hydrogen that does not participate in the reaction at the anode of the fuel cell system is circulated. The metering ratio of the mixed hydrogen is adjusted in real time according to the change of the front-end pressure, and the mixed gas will be transported to the cathode of the fuel cell system.

[0025] The beneficial effects of the present invention are:

[0026] 1. The present invention replaces the original high-energy-consuming air compressor and hydrogen circulation pump by a single-stage or multi-stage ejector, and makes efficient use of the high-pressure pure oxygen and high-pressure pure hydrogen at the front end. When the high-pressure pure oxygen passes through the ejector, external air will be injected and mixed at the ejector outlet. The proportion of oxygen content in the mixed gas will be regulated in real time according to the change of the front-end pressure, which greatly improves the stability of the system's power generation. In addition, high-pressure pure hydrogen can also realize the recycling of hydrogen in the anode path by ejection, thereby improving the utilization rate of hydrogen. The power loss of tens of kilowatts or even higher generated by the replaced air compressor and hydrogen circulation pump during use will be converted into corresponding power generation, so that the power generation efficiency of the combined power generation system is greatly improved.

[0027] 2. The present invention not only uses the injection method to achieve efficient utilization of high-pressure pure hydrogen and high-pressure oxygen, but also replaces the original air compressor and hydrogen circulation pump, so that the excessive energy loss is converted into greater power generation, and to a certain extent, the overall cost of the system is reduced. In addition, the oxygen concentration of the air entering the fuel cell system is regulated in real time through pressure regulation, which greatly expands the application field of the combined power generation system, such as providing a green energy supply system for high-altitude areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of a hydrogen fuel cell combined power generation system based on high-pressure hydrogen and oxygen according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0030] like Figure 1As shown, this embodiment provides a hydrogen fuel cell combined power generation system based on high-pressure hydrogen and oxygen, including an oxygen line delivery subsystem and a hydrogen line delivery subsystem. Among them, the oxygen line delivery subsystem is configured to input high-pressure pure oxygen 1 to the first ejector 11, and introduce external air to mix at the outlet of the first ejector 11, the proportion of oxygen content in the mixed gas is adjusted in real time according to the front-end pressure change, and the mixed gas will be delivered to the cathode of the fuel cell system 25; the hydrogen line delivery subsystem is configured to input high-pressure pure hydrogen 26 to the second ejector 21, and mix with the hydrogen that does not participate in the reaction at the anode of the fuel cell system 25 at the outlet of the second ejector 21, the mixed hydrogen metering ratio is adjusted in real time according to the front-end pressure change, and the mixed gas will be delivered to the anode of the fuel cell system 25.

[0031] In this embodiment, high-pressure pure hydrogen 1 and high-pressure pure hydrogen 26 are transported in two routes, and the gas source can be obtained by using a PEM hydrogen production system, an alkaline water electrolysis hydrogen production system, etc.

[0032] Preferably, the oxygen path delivery subsystem includes a first electromagnetic shut-off valve 2, a first pressure regulating valve 3, a first pressure sensor 4, a second electromagnetic shut-off valve 5, a first proportional valve 6, a second proportional valve 7, an air filter 8, a first temperature and pressure sensor 9, a first humidity sensor 10, a first ejector 11, a second humidity sensor 12 and a second temperature and pressure sensor 13, wherein: the first electromagnetic shut-off valve 2, the first pressure regulating valve 3, the first pressure sensor 4, the second electromagnetic shut-off valve 5, the first proportional valve 6 and the first ejector 11 are connected in sequence, the air inlet end of the first electromagnetic shut-off valve 2 inputs high-pressure pure oxygen 1, the second proportional valve 7 is connected in parallel with the first proportional valve 6, the output end of the first ejector 11 is connected to the cathode air inlet end of the fuel cell system 25, the second humidity sensor 12 and the second temperature and pressure sensor 13 are arranged on the pipeline between the first ejector 11 and the fuel cell system 25; the air inlet end of the air filter 8 inputs air, and the exhaust end is connected to the air input end of the first ejector 11, and the first temperature and pressure sensor 9 and the first humidity sensor 10 are arranged on the air inlet end pipeline of the air filter 8.

[0033] Preferably, the hydrogen gas transport subsystem includes a third temperature and pressure sensor 14, a third humidity sensor 15, a third proportional valve 16, a fourth humidity sensor 17, a fourth temperature and pressure sensor 18, a steam-water separator 19, a drain valve 20, a second ejector 21, a fourth proportional valve 22, a second pressure sensor 23, a third electromagnetic shut-off valve 24, a fourth electromagnetic shut-off valve 27 and a second pressure regulating valve 28, wherein: the fourth electromagnetic shut-off valve 27, the second pressure regulating valve 28, the second pressure sensor 23, the third electromagnetic shut-off valve 24, the third proportional valve 16 and the second ejector 21 are connected in sequence, and the air inlet end of the fourth electromagnetic shut-off valve 27 is connected to the air inlet end of the second electromagnetic shut-off valve 27. High-pressure pure hydrogen 26 is input, the fourth proportional valve 22 is connected in parallel with the third proportional valve 16, the output end of the second ejector 21 is connected to the anode air inlet end of the fuel cell system 25, the third temperature and pressure sensor 14 and the third humidity sensor 15 are arranged on the pipeline between the second ejector 21 and the fuel cell system 25; the fourth humidity sensor 17 and the fourth temperature and pressure sensor 18 are arranged on the pipeline between the steam-water separator 19 and the second ejector 21, the input end of the steam-water separator 19 is connected to the anode exhaust end of the fuel cell system 25, and the exhaust end is connected to the hydrogen input end of the second ejector 21, and the drain end is connected to the drain valve 20.

[0034] Accordingly, the present embodiment also provides a hydrogen fuel cell combined power generation control method based on high-pressure hydrogen and oxygen, including: inputting high-pressure pure oxygen 1 through the first ejector 11, and introducing external air for mixing at the outlet of the first ejector 11, the proportion of oxygen content in the mixed gas is adjusted in real time according to the front-end pressure change, and the mixed gas will be transported to the cathode of the fuel cell system 25; inputting high-pressure pure hydrogen 26 through the second ejector 21, and circulating the hydrogen that does not participate in the reaction at the anode of the fuel cell system 25, the mixed hydrogen metering ratio is adjusted in real time according to the front-end pressure change, and the mixed gas will be transported to the cathode of the fuel cell system 25.

[0035] For the oxygen path transport subsystem, first open the first electromagnetic shut-off valve 2. If necessary, a buffer tank can be added at the outlet of the high-pressure pure oxygen 1 to improve the safety of the system; then adjust the first pressure regulating valve 3 to an appropriate pressure. When the operating power of the fuel cell system 25 is less than the first preset power W1, open the second electromagnetic shut-off valve 5 and the first proportional valve 6, and adopt single-stage injection; when the operating power of the fuel cell system 25 is greater than the first preset power W1, open the second electromagnetic shut-off valve 5, the first proportional valve 6 and the second proportional valve 7 at the same time, and adopt multi-stage injection.

[0036] When the high-pressure pure oxygen 1 reaches the inlet of the first ejector 11 from the outlet of the first proportional valve 6 or the second proportional valve 7, the inflow of the high-pressure pure oxygen 1 will be injected into the external air; if necessary, a small air compressor can be used for drainage at the beginning, and it can be turned off after the air flow is stable. The external air is mixed with the high-pressure pure oxygen 1 at the outlet of the first ejector 11 through the air filter 8, and the proportion of oxygen content in the mixed gas can be calculated based on the parameters obtained by the first pressure sensor 4, the first humidity sensor 10, the first temperature and pressure sensor 9, the second humidity sensor 12 and the second temperature and pressure sensor 13, and the proportion of oxygen content in the mixed gas is controlled by adjusting the first pressure regulating valve 3. Subsequently, the air with controllable oxygen concentration will directly reach the cathode inlet of the fuel cell system 25 through the outlet of the first ejector 11.

[0037] For the hydrogen gas transport subsystem, first open the fourth electromagnetic shut-off valve 27. If necessary, add a buffer tank at the outlet of the high-pressure pure hydrogen 26 to improve the safety of the system; then adjust the second pressure regulating valve 28 to a suitable pressure. When the operating power of the fuel cell system 25 is less than the second preset power W2, open the third electromagnetic shut-off valve 24 and the third proportional valve 16, and adopt single-stage injection; when the operating power of the fuel cell system 25 is greater than the second preset power W2, open the third electromagnetic shut-off valve 24, the third proportional valve 16 and the fourth proportional valve 22, and adopt multi-stage injection.

[0038] The high-pressure pure hydrogen 26 is transported through the ejector, which will cause the hydrogen that has not participated in the reaction at the anode of the fuel cell system 25 to circulate. The stoichiometric ratio of the mixed hydrogen can be calculated based on the parameters obtained by the third temperature and pressure sensor 14, the third humidity sensor 15, the fourth humidity sensor 17 and the fourth temperature and pressure sensor 18, and the stoichiometric ratio of the anode of the fuel cell system 25 can be controlled by adjusting the second pressure regulating valve 28.

[0039] Air with controllable oxygen concentration and pure hydrogen will enter from the cathode inlet and anode inlet of the fuel cell system 25 respectively and react to generate electrical energy, which will provide the required electricity to the external load through external circuit connection.

[0040] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

Claims

1. A hydrogen fuel cell combined power generation system based on high-pressure hydrogen and oxygen, characterized in that: include: The oxygen path delivery subsystem is configured to input high-pressure pure oxygen (1) to the first ejector (11), and introduce external air to mix at the outlet of the first ejector (11), the proportion of oxygen content in the mixed gas is adjusted in real time according to the change of the front-end pressure, and the mixed gas will be delivered to the cathode of the fuel cell system (25); The hydrogen gas transport subsystem is configured to input high-pressure pure hydrogen (26) into the second ejector (21) and mix it with the unreacted hydrogen at the anode of the fuel cell system (25) at the outlet of the second ejector (21). The metering ratio of the mixed hydrogen is controlled in real time according to the change of the front-end pressure, and the mixed gas will be transported to the anode of the fuel cell system (25).

2. A hydrogen fuel cell combined power generation system based on high pressure hydrogen and oxygen according to claim 1, characterized in that: The oxygen path delivery subsystem comprises a first electromagnetic shut-off valve (2), a first pressure regulating valve (3), a first pressure sensor (4), a second electromagnetic shut-off valve (5), a first proportional valve (6), a second proportional valve (7), an air filter (8), a first temperature and pressure sensor (9), a first humidity sensor (10), a first ejector (11), a second humidity sensor (12) and a second temperature and pressure sensor (13), wherein: The first electromagnetic shut-off valve (2), the first pressure regulating valve (3), the first pressure sensor (4), the second electromagnetic shut-off valve (5), the first proportional valve (6) and the first ejector (11) are connected in sequence; the air inlet end of the first electromagnetic shut-off valve (2) inputs high-pressure pure oxygen (1); the second proportional valve (7) is connected in parallel with the first proportional valve (6); the output end of the first ejector (11) is connected to the cathode air inlet end of the fuel cell system (25); and the second humidity sensor (12) and the second temperature and pressure sensor (13) are arranged on a pipeline between the first ejector (11) and the fuel cell system (25); The air inlet end of the air filter (8) inputs air, and the exhaust end is connected to the air input end of the first ejector (11), and the first temperature and pressure sensor (9) and the first humidity sensor (10) are arranged on the air inlet end pipeline of the air filter (8).

3. A hydrogen fuel cell combined power generation system based on high pressure hydrogen and oxygen according to claim 2, characterized in that: For the oxygen path transport subsystem, when the operating power of the fuel cell system (25) is less than the first preset power W1, the second electromagnetic shutoff valve (5) and the first proportional valve (6) are opened, and single-stage injection is adopted; when the operating power of the fuel cell system (25) is greater than the first preset power W1, the second electromagnetic shutoff valve (5), the first proportional valve (6) and the second proportional valve (7) are opened at the same time, and multi-stage injection is adopted.

4. A hydrogen fuel cell combined power generation system based on high pressure hydrogen and oxygen according to claim 2, characterized in that: The method of transporting high-pressure pure oxygen (1) through an ejector requires the introduction of external air. The external air is mixed with the high-pressure pure oxygen (1) at the outlet of the first ejector (11) through an air filter (8). The proportion of oxygen content in the mixed gas is calculated based on parameters obtained by the first pressure sensor (4), the first humidity sensor (10), the first temperature and pressure sensor (9), the second humidity sensor (12) and the second temperature and pressure sensor (13), and the proportion of oxygen content in the mixed gas is controlled by adjusting the first pressure regulating valve (3).

5. A hydrogen fuel cell combined power generation system based on high pressure hydrogen and oxygen according to claim 2, characterized in that: The oxygen path delivery subsystem further comprises a buffer tank, which is arranged at the high-pressure pure oxygen outlet.

6. A hydrogen fuel cell combined power generation system based on high pressure hydrogen and oxygen according to claim 1, characterized in that: The hydrogen gas transport subsystem comprises a third temperature and pressure sensor (14), a third humidity sensor (15), a third proportional valve (16), a fourth humidity sensor (17), a fourth temperature and pressure sensor (18), a steam-water separator (19), a drain valve (20), a second ejector (21), a fourth proportional valve (22), a second pressure sensor (23), a third electromagnetic shut-off valve (24), a fourth electromagnetic shut-off valve (27) and a second pressure regulating valve (28), wherein: The fourth electromagnetic shut-off valve (27), the second pressure regulating valve (28), the second pressure sensor (23), the third electromagnetic shut-off valve (24), the third proportional valve (16) and the second ejector (21) are connected in sequence; the air inlet end of the fourth electromagnetic shut-off valve (27) inputs high-pressure pure hydrogen (26); the fourth proportional valve (22) is connected in parallel with the third proportional valve (16); the output end of the second ejector (21) is connected to the anode air inlet end of the fuel cell system (25); and the third temperature and pressure sensor (14) and the third humidity sensor (15) are arranged on the pipeline between the second ejector (21) and the fuel cell system (25); The fourth humidity sensor (17) and the fourth temperature and pressure sensor (18) are arranged on the pipeline between the steam-water separator (19) and the second ejector (21); the input end of the steam-water separator (19) is connected to the anode exhaust end of the fuel cell system (25), the exhaust end is connected to the hydrogen input end of the second ejector (21), and the drain end is connected to the drain valve (20).

7. A hydrogen fuel cell combined power generation system based on high pressure hydrogen and oxygen according to claim 6, characterized in that: For the hydrogen gas path transport subsystem, when the operating power of the fuel cell system (25) is less than the second preset power W2, the third electromagnetic shutoff valve (24) and the third proportional valve (16) are opened, and single-stage injection is adopted; when the operating power of the fuel cell system (25) is greater than the second preset power W2, the third electromagnetic shutoff valve (24), the third proportional valve (16) and the fourth proportional valve (22) are opened, and multi-stage injection is adopted.

8. The hydrogen fuel cell combined power generation system based on high pressure hydrogen and oxygen according to claim 6 is characterized in that: The high-pressure pure hydrogen (26) is transported through an ejector, which will cause the hydrogen that has not participated in the reaction at the anode of the fuel cell system (25) to circulate. The stoichiometric ratio of the mixed hydrogen is calculated based on the parameters obtained by the third temperature and pressure sensor (14), the third humidity sensor (15), the fourth humidity sensor (17) and the fourth temperature and pressure sensor (18), and the stoichiometric ratio of the anode of the fuel cell system (25) is controlled by adjusting the second pressure regulating valve (28).

9. A hydrogen fuel cell combined power generation system based on high pressure hydrogen and oxygen according to claim 6, characterized in that: The hydrogen gas transport subsystem further includes a buffer tank, which is arranged at the high-pressure pure hydrogen outlet.

10. A method for controlling the combined power generation of a hydrogen fuel cell based on high pressure hydrogen and oxygen, characterized in that: include: High-pressure pure oxygen (1) is input through a first ejector (11), and external air is introduced at the outlet of the first ejector (11) for mixing, the proportion of oxygen content in the mixed gas is controlled in real time according to the change of the front-end pressure, and the mixed gas is transported to the cathode of the fuel cell system (25); High-pressure pure hydrogen (26) is input through the second ejector (21), and the hydrogen that does not participate in the reaction at the anode of the fuel cell system (25) is circulated. The metering ratio of the mixed hydrogen is controlled in real time according to the change of the front-end pressure, and the mixed gas is transported to the cathode of the fuel cell system (25).

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