Dual-modal multi-propellant combined cycle system and dual-modal multi-propellant combined cycle method

Abstract

This invention relates to a dual-modal multi-fluid combined cycle system and method, belonging to the technical field of hydrogen energy utilization equipment. It includes a compressor, turbine, combustion chamber, battery, generator, water pump, water pump motor, fuel cell, hydrogen storage tank, oxygen storage tank, and regenerator. Power is transmitted between the generator and turbine, between the turbine and compressor, and between the water pump motor and water pump via rotating shafts. The turbine's gas outlet is connected to the hot-end inlet of the regenerator. The hot-end outlet of the regenerator is connected to a first exhaust pipe, and the fuel cell is connected to a second exhaust pipe. The waste heat from the gas turbine subsystem is used to heat the fuel before the high-temperature fuel is fed into the high-temperature fuel cell, improving the reaction conditions within the fuel cell and increasing its power generation efficiency. The dual-modal multi-fluid combined cycle system of this invention features high integration, rapid system start-up, safe and stable operation under different working fluid conditions, and flexible and simple operation.

Description

Technical Field

[0001] This invention relates to a dual-mode multi-working-medium combined cycle system and a dual-mode multi-working-medium combined cycle method, belonging to the technical field of hydrogen energy utilization equipment. Background Technology

[0002] In the 21st century, with the development of industry and transportation, the demand for energy has increased significantly. Traditional non-renewable fossil fuels bring a series of environmental problems. Hydrogen energy, as a clean, efficient, safe, and sustainable energy source, has advantages such as high energy density, high calorific value, wide availability, high conversion efficiency, and zero carbon emissions. The vast majority of the product of hydrogen combustion is water vapor, making it an ideal green fuel.

[0003] Fuel cells are a technology that directly converts the chemical energy of fuel into electrical energy. Therefore, their energy conversion efficiency is not limited by the Carnot cycle efficiency, and their net power generation efficiency is significantly higher than that of thermal cycle power generation. However, fuel cells suffer from long start-up and shutdown times and slow response to load changes.

[0004] Fuel cell-gas turbine combined cycle technology can overcome the aforementioned shortcomings of fuel cells. However, existing fuel cell-gas turbine combined cycle technologies suffer from complex structures and low overall net power generation efficiency of hydrogen power generation systems. Furthermore, existing fuel cell-gas turbine combined cycle systems cannot achieve stable operation under different modes and working fluid conditions. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems and provides a dual-modal multi-working-medium combined circulation system and a dual-modal multi-working-medium combined circulation method.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A dual-modal multi-working-fluid combined cycle system includes a compressor, turbine, combustion chamber, battery, generator, water pump, water pump motor, fuel cell, hydrogen storage tank, oxygen storage tank, and regenerator. Power is transmitted between the generator and turbine, between the turbine and compressor, and between the water pump motor and water pump via rotating shafts. The turbine's gas outlet is connected to the hot-end inlet of the regenerator. The hot-end outlet of the regenerator is connected to a first exhaust pipe, and the fuel cell is connected to a second exhaust pipe.

[0008] The cold end of the regenerator includes first to third cold end pipelines. One outlet of the hydrogen storage tank is connected to the inlet of the first cold end pipeline via a pipeline. The inlet of the first cold end pipeline is connected to the anode of the fuel cell via a pipeline. One outlet of the oxygen storage tank is connected to the inlet of the second cold end pipeline via a pipeline. The outlet of the second cold end pipeline is connected to the cathode of the fuel cell via a pipeline. The outlet of the compressor is connected to the inlet of the third cold end pipeline via a pipeline. The outlet of the third cold end pipeline, another outlet of the hydrogen storage tank, and another outlet of the oxygen storage tank are each connected to the combustion chamber via pipelines. The outlet of the combustion chamber is connected to the gas inlet of the turbine via a pipeline.

[0009] The water pump has an inlet pipe connected to its inlet, and its outlet is connected to an air compressor via a pipe. The air compressor is also connected to an air inlet pipe.

[0010] A first shut-off valve is installed on the connecting pipeline between the water pump and the compressor; a second shut-off valve is installed on the connecting pipeline between the oxygen storage tank and the combustion chamber; and a third shut-off valve is installed on the intake pipeline.

[0011] The fuel cell is electrically connected to the storage battery, the storage battery to the generator, and the storage battery to the water pump motor.

[0012] Furthermore, the water pump is connected to the water storage tank via an inlet pipe.

[0013] Furthermore, the generator and the battery are connected by a bidirectional electrical connection.

[0014] Furthermore, fourth to sixth shut-off valves are sequentially installed on the connecting pipelines between the compressor and the third cold end pipeline, between the hydrogen storage tank and the first cold end pipeline, and between the oxygen storage tank and the second cold end pipeline.

[0015] Furthermore, the connecting pipes between the first cold end pipe and the anode of the fuel cell, the second cold end pipe and the cathode of the fuel cell, and the third cold end pipe and the combustion chamber are sequentially equipped with seventh to ninth shut-off valves.

[0016] Furthermore, a tenth shut-off valve is installed on the connecting pipeline between the hydrogen storage tank and the combustion chamber.

[0017] A dual-modal multi-working-propellant combined circulation method employing the above system,

[0018] When the dual-mode multi-working-fluid combined cycle system is in mode one, the first and second shut-off valves are closed, and the third shut-off valve is open.

[0019] When the generator is powered on, it functions as a starter, driving the compressor and turbine to rotate. The compressor rotates, draws in air, and pressurizes it. The pressurized air enters the combustion chamber through the cold end of the regenerator, where it burns with hydrogen from the hydrogen storage tank to generate high-temperature, high-pressure fuel gas. This fuel gas enters the turbine, expands, and performs work, reducing its pressure and temperature. It then enters the hot end of the regenerator through a pipeline and is finally discharged into the external environment through the first exhaust pipe. When the turbine's output power exceeds the compressor's power consumption, the starter switches to generator mode, outputting electrical power to the battery.

[0020] Hydrogen from the hydrogen storage tank and oxygen from the oxygen storage tank enter the cold end of the regenerator, where waste heat from the gas is used to heat the hydrogen and oxygen. Then, they are fed into the anode and cathode of the fuel cell, respectively. Inside the fuel cell, electrical energy is generated through an electrochemical reaction and output to the battery. At the same time, the generated gas is discharged into the external environment through the second exhaust pipe.

[0021] When the dual-mode multi-working-medium combined cycle system is in mode two, the third shut-off valve is closed, and the first and second shut-off valves are open.

[0022] The generator is powered on and acts as a starter, driving the compressor and turbine to rotate. Simultaneously, the water pump is powered on, and liquid water, after being pressurized by the pump, enters the cold end of the regenerator through the compressor channel. Hydrogen from the hydrogen storage tank and oxygen from the oxygen storage tank enter the combustion chamber and burn, generating high-temperature, high-pressure fuel gas. This fuel gas enters the turbine, expands, and performs work, reducing its pressure and temperature. It then enters the hot end of the regenerator, heating the pressurized liquid water that also enters the regenerator. Finally, it is discharged into the external environment through the first exhaust pipe. The liquid water, after being heated by the regenerator, enters the combustion chamber and burns together with hydrogen and oxygen. At this point, the amount of fuel gas entering the turbine to expand and perform work also increases, and the turbine's output power exceeds the compressor's power consumption. The starter then transforms into a generator, outputting electrical power to the battery.

[0023] Hydrogen from the hydrogen storage tank and oxygen from the oxygen storage tank enter the cold end of the regenerator, where waste heat from the gas is used to heat the hydrogen and oxygen. The oxygen is then fed into the anode and cathode of the fuel cell, respectively. Inside the fuel cell, electrical energy is generated through a chemical reaction and output to the battery. At the same time, the generated gas is discharged into the external environment through the second exhaust pipe.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The dual-mode multi-working-fluid combined cycle system in this application combines a high-temperature fuel cell with a gas turbine system. By generating electricity through the joint operation of the high-temperature fuel cell subsystem and the gas turbine subsystem, the overall net power generation efficiency of the hydrogen power generation system is improved. Utilizing the waste heat from the gas turbine subsystem to heat the fuel before feeding the high-temperature fuel into the high-temperature fuel cell improves the reaction conditions within the fuel cell and enhances its power generation efficiency.

[0026] The dual-modal multi-working-medium combined cycle system of this application is highly integrated, starts up quickly, and can operate safely and stably under different modes and working-medium conditions. Its operation is flexible and simple. Attached Figure Description

[0027] Figure 1 This is a front view schematic diagram of the dual-modal multi-working-medium combined cycle system in this application;

[0028] Figure 2 This is a schematic diagram of the operation process of the dual-modal multi-working-medium combined cycle system in this application in one of the modes;

[0029] Figure 3 This is a schematic diagram of the operation process of the dual-modal multi-working-medium combined cycle system in this application under mode two. Detailed Implementation

[0030] Specific implementation method one: Combining Figures 1-3 This embodiment describes a dual-modal multi-working-fluid combined cycle system, comprising a compressor 1, a turbine 2, a combustion chamber 3, a battery 4, a generator 5, a water pump 6, a water pump motor 7, a fuel cell 8, a hydrogen storage tank 9, an oxygen storage tank 10, and a regenerator 11. Power is transmitted between the generator 5 and the turbine 2, between the turbine 2 and the compressor 1, and between the water pump motor 7 and the water pump 6 via rotating shafts. The gas outlet of the turbine 2 is connected to the hot end inlet of the regenerator 11. The hot end outlet of the regenerator 11 is connected to a first exhaust pipe 12, and the fuel cell 8 is connected to a second exhaust pipe 13.

[0031] The cold end of the regenerator 11 includes first to third cold end pipelines. One outlet of the hydrogen storage tank 9 is connected to the inlet of the first cold end pipeline 11-1 via a pipeline. The inlet of the first cold end pipeline 11-1 is connected to the anode of the fuel cell 8 via a pipeline. One outlet of the oxygen storage tank 10 is connected to the inlet of the second cold end pipeline 11-2 via a pipeline. The outlet of the second cold end pipeline 11-2 is connected to the cathode of the fuel cell 8 via a pipeline. The outlet of the compressor 1 is connected to the inlet of the third cold end pipeline 11-3 via a pipeline. The outlet of the third cold end pipeline 11-3, another outlet of the hydrogen storage tank 9, and another outlet of the oxygen storage tank 10 are respectively connected to the combustion chamber 3 via pipelines. The outlet of the combustion chamber 3 is connected to the gas inlet of the turbine 2 via a pipeline.

[0032] The inlet of water pump 6 is connected to a water inlet pipe, and the outlet of water pump 6 is connected to compressor 1 through a pipe. Compressor 1 is also connected to an air inlet pipe 14.

[0033] A first shut-off valve 15 is installed on the connecting pipeline between the water pump 6 and the compressor 1; a second shut-off valve 16 is installed on the connecting pipeline between the oxygen storage tank 10 and the combustion chamber 3; and a third shut-off valve 17 is installed on the air intake pipeline 14.

[0034] The fuel cell 8 is electrically connected to the battery 4, the battery 4 is electrically connected to the generator 5, and the battery 4 is electrically connected to the water pump motor 7.

[0035] The output end of generator 5 is connected to the input end of turbine 2, the output end of turbine 2 is connected to the input end of compressor 1, and the output end of water pump motor 7 is connected to the input end of water pump 6 via rotating shafts.

[0036] When the dual-mode multi-working-fluid combined cycle system is started, the gas turbine subsystem consists of compressor 1, turbine 2, combustion chamber 3, hydrogen storage tank 9, oxygen storage tank 10, regenerator 11, generator 5 and battery 4; the fuel cell subsystem consists of hydrogen storage tank 9, oxygen storage tank 10, regenerator 11, fuel cell 8 and battery 4.

[0037] During the operation of the dual-mode multi-working-fluid combined cycle system, the generator 5 can function as either a generator or a starter depending on the operating conditions. When the system starts working, the generator 5 is energized and functions as a starter. When the output power of the turbine 2 is greater than the power consumed by the compressor 1, the starter switches to generator 5 and outputs electrical power to the battery 4.

[0038] The dual-mode multi-working-fluid combined cycle system of this application can be used in different special environments, such as hydrogen-air conditions (mode one) or hydrogen-oxygen-water conditions (mode two).

[0039] The dual-mode multi-working-fluid combined cycle system in this application combines a high-temperature fuel cell 8 with a gas turbine system. By generating electricity through the joint operation of the high-temperature fuel cell 8 and the gas turbine subsystem, the overall net power generation efficiency of the hydrogen power generation system is improved. Utilizing the waste heat from the gas turbine subsystem to heat the fuel before feeding the high-temperature fuel into the high-temperature fuel cell 8 improves the reaction conditions within the high-temperature fuel cell 8, thereby increasing its power generation efficiency.

[0040] The dual-modal multi-working-medium combined cycle system of this application is highly integrated, starts up quickly, can operate safely and stably under different working-medium conditions, and is flexible and simple to operate.

[0041] The water pump is connected to the water storage tank 18 through the water inlet pipe.

[0042] The generator 5 and the battery 4 are connected bidirectionally. With this design, when the generator is used as a starter, it is powered by the battery. When the output power of the turbine 2 is greater than the power consumed by the compressor 1, the starter switches to generator 5 and outputs electrical power to the battery 4.

[0043] Fourth to sixth shut-off valves are sequentially installed on the connecting pipelines between compressor 1 and the third cold end pipeline 11-3, between hydrogen storage tank 9 and the first cold end pipeline 11-1, and between oxygen storage tank 10 and the second cold end pipeline 11-2. This design allows for easy control of pipeline opening and closing by installing shut-off valves.

[0044] The seventh to ninth shut-off valves are sequentially installed on the connecting pipes between the first cold-end pipe 11-1 and the anode of the fuel cell 8, between the second cold-end pipe 11-2 and the cathode of the fuel cell 8, and between the third cold-end pipe 11-3 and the combustion chamber 3. This design allows for easy control of the pipe flow by installing shut-off valves.

[0045] A tenth shut-off valve is installed on the connecting pipeline between the hydrogen storage tank 9 and the combustion chamber 3. This design allows for easy control of the pipeline's opening and closing by using the shut-off valve.

[0046] Specific Implementation Method Two: Combining Figures 1-3 This embodiment describes a dual-mode multi-working-fluid combined cycle method using the above-described system. When the dual-mode multi-working-fluid combined cycle system is in mode one, the first shut-off valve 15 and the second shut-off valve 16 are closed, and the third shut-off valve 17 is open.

[0047] In the gas turbine subsystem, generator 5 is energized and functions as a starter, driving compressor 1 and turbine 2 to rotate via a rotating shaft. Compressor 1 rotates, draws in air, and pressurizes it. The pressurized air enters combustion chamber 3 through the third cold-end pipe 11-3 of regenerator 11, where it burns with hydrogen from hydrogen storage tank 9 to generate high-temperature, high-pressure gas. This gas enters turbine 2, expands, and performs work, reducing its pressure and temperature. It then enters the hot end of regenerator 11 through a pipe and is finally discharged into the external environment through the first exhaust pipe 12. As the rotational speed of the shaft increases, the flow rates of air and hydrogen also increase, as does the amount of gas entering turbine 2 to expand and perform work. When the output power of turbine 2 exceeds the power consumption of compressor 1, the starter switches to generator 5, outputting electrical power to battery 4.

[0048] For the fuel cell subsystem, hydrogen from hydrogen storage tank 9 enters the first cold end pipe 11-1 of regenerator 11, where the waste heat from the gas turbine subsystem is used to heat the hydrogen before it is sent to the anode of fuel cell 8; oxygen from oxygen storage tank 10 enters the second cold end pipe 11-2 of regenerator 11, where the waste heat from the gas turbine subsystem is used to heat the oxygen before it is sent to the cathode of fuel cell 8; the fuel cell 8 generates electrical energy through an electrochemical reaction and outputs it to battery 4, while the generated gas is discharged into the external environment through the second exhaust pipe 13.

[0049] When the dual-mode multi-working-medium combined cycle system is in mode two, the third shut-off valve 17 is closed, and the first shut-off valve 15 and the second shut-off valve 16 are open.

[0050] For the gas turbine subsystem, generator 5 is energized and acts as a starter, driving compressor 1 and turbine 2 to rotate via a rotating shaft. Simultaneously, water pump 6 is energized, and liquid water, after being pressurized by water pump 6, enters the third cold end pipe 11-3 of regenerator 11 through the compressor 1 channel. Hydrogen in hydrogen storage tank 9 and oxygen in oxygen storage tank 10 enter combustion chamber 3 for combustion, generating high-temperature and high-pressure gas. The gas enters turbine 2, expands and does work, reducing the pressure and temperature of the gas. Then, the gas enters the hot end of regenerator 11 to heat the pressurized liquid water that entered regenerator 11 along with it. Finally, it is discharged into the external environment through the first exhaust pipe 12. After being heated by regenerator 11, the liquid water enters combustion chamber 3 and burns together with hydrogen and oxygen. At this time, the amount of gas entering turbine 2 to expand and do work also increases. The output power of turbine 2 is greater than the power consumption of compressor 1, and the starter is converted into generator 5, outputting electrical power to battery 4.

[0051] For the fuel cell subsystem, hydrogen from hydrogen storage tank 9 enters the first cold end pipe 11-1 of regenerator 11, where the waste heat from the gas turbine subsystem is used to heat the hydrogen before it is sent to the anode of fuel cell 8; oxygen from oxygen storage tank 10 enters the second cold end pipe 11-2 of regenerator 11, where the waste heat from the gas turbine subsystem is used to heat the oxygen before it is sent to the cathode of fuel cell 8; the fuel cell 8 generates electrical energy through an electrochemical reaction and outputs it to battery 4, while the generated gas is discharged into the external environment through the second exhaust pipe 13.

[0052] Other components and connections are the same as in Specific Implementation Method 1.

[0053] Specific implementation method three: Combining Figures 1-3 This embodiment describes the dual-mode multi-working-medium combined cycle system in mode one.

[0054] The parameters of the gas turbine subsystem are as follows: compressor inlet pressure is 1 bar, temperature is 15℃, and air mass flow rate is 1.869 kg / s; hydrogen mass flow rate is 0.00986 kg / s; combustion chamber inlet air pressure is 4.95 bar, temperature is 500℃, and mass flow rate is 1.878 kg / s; combustion chamber outlet steam pressure is 4.75 bar, and temperature is 1000℃; turbine outlet pressure is 1.212 bar, and temperature is 695.1℃; regenerator hot-end steam outlet pressure is 1.2 bar, and temperature is 423.8℃; compressor isentropic efficiency is 85%, and mechanical efficiency is 98%; turbine is entropic efficiency is 85%, and mechanical efficiency is 98%; generator efficiency is 96.8%; regenerator regeneration rate is 59.7%.

[0055] The parameters of the fuel cell subsystem are as follows: oxygen pressure is 1.2 bar, temperature is 200℃, and mass flow rate is 0.03333 kg / s; hydrogen pressure is 1.2 bar, temperature is 200℃, and mass flow rate is 0.00417 kg / s; the fuel cell electrochemical conversion rate is 60%.

[0056] Both the gas turbine subsystem and the fuel cell subsystem have a power output of 300kW, and the overall system power generation efficiency is 35.6%.

[0057] When the dual-mode multi-working-propellant combined cycle system is in mode two

[0058] The parameters of the gas turbine subsystem are as follows: water pump inlet pressure is 1 bar, temperature is 15℃, and liquid water mass flow rate is 0.388 kg; hydrogen mass flow rate is 0.0156 kg / s; oxygen mass flow rate is 0.1248 kg / s; combustion chamber inlet steam pressure is 4.95 bar, temperature is 150℃; combustion chamber outlet steam pressure is 4.75 bar, temperature is 1000℃; turbine outlet pressure is 1.212 bar, temperature is 748.8℃; regenerator hot-end steam outlet pressure is 1.2 bar, temperature is 530.9℃; turbine entropy efficiency is 85%, mechanical efficiency is 98%; generator efficiency is 96.8%; regenerator regeneration rate is 18.4%.

[0059] The parameters of the fuel cell subsystem are as follows: oxygen pressure is 1.2 bar, temperature is 200℃, and mass flow rate is 0.03333 kg / s; hydrogen pressure is 1.2 bar, temperature is 200℃, and mass flow rate is 0.00417 kg / s; the fuel cell electrochemical conversion rate is 60%.

[0060] Both the gas turbine subsystem and the fuel cell subsystem have a power output of 300kW, and the overall system power generation efficiency is 25.3%.

[0061] Other components and connections are the same as in specific implementation method one or two.

Claims

1. A dual-modal multi-working-fluid combined cycle system, characterized in that: The system includes a compressor (1), a turbine (2), a combustion chamber (3), a battery (4), a generator (5), a water pump (6), a water pump motor (7), a fuel cell (8), a hydrogen storage tank (9), an oxygen storage tank (10), and a regenerator (11). The generator (5) and the turbine (2), the turbine (2) and the compressor (1), and the water pump motor (7) and the water pump (6) transmit power through rotating shafts. The gas outlet of the turbine (2) is connected to the hot end inlet of the regenerator (11). The hot end outlet of the regenerator (11) is connected to a first exhaust pipe (12), and the fuel cell (8) is connected to a second exhaust pipe (13). The cold end of the regenerator (11) includes first to third cold end pipelines. One outlet of the hydrogen storage tank (9) is connected to the inlet of the first cold end pipeline (11-1) via a pipeline. The inlet of the first cold end pipeline (11-1) is connected to the anode of the fuel cell (8) via a pipeline. One outlet of the oxygen storage tank (10) is connected to the inlet of the second cold end pipeline (11-2) via a pipeline. The outlet of the second cold end pipeline (11-2) is connected to the cathode of the fuel cell (8) via a pipeline. The outlet of the compressor (1) is connected to the inlet of the third cold end pipeline (11-3) via a pipeline. The outlet of the third cold end pipeline (11-3), another outlet of the hydrogen storage tank (9), and another outlet of the oxygen storage tank (10) are respectively connected to the combustion chamber (3) via pipelines. The outlet of the combustion chamber (3) is connected to the gas inlet of the turbine (2) via a pipeline. The inlet of the water pump (6) is connected to a water inlet pipe, and the outlet of the water pump (6) is connected to the compressor (1) through a pipe. The compressor (1) is also connected to an air inlet pipe (14). A first shut-off valve (15) is installed on the connecting pipeline between the water pump (6) and the compressor (1), a second shut-off valve (16) is installed on the connecting pipeline between the oxygen storage tank (10) and the combustion chamber (3), and a third shut-off valve (17) is installed on the air intake pipeline (14). The fuel cell (8) is electrically connected to the storage battery (4), the storage battery (4) is electrically connected to the generator (5), and the storage battery (4) is electrically connected to the water pump motor (7); The dual-mode includes mode one: hydrogen-air condition and mode two: hydrogen-oxygen-water condition; When the dual-mode multi-working-medium combined circulation system is in mode one, the first shut-off valve (15) and the second shut-off valve (16) are closed, and the third shut-off valve (17) is open; When the dual-mode multi-working-medium combined cycle system is in mode two, the third shut-off valve (17) is closed, and the first shut-off valve (15) and the second shut-off valve (16) are open. The generator (5) and the battery (4) are connected by a bidirectional electrical connection; A seventh shut-off valve is installed between the first cold end pipeline (11-1) and the anode of the fuel cell (8).

2. The dual-modal multi-working-fluid combined circulation system according to claim 1, characterized in that: The water pump is connected to the water storage tank (18) through the water inlet pipe.

3. The dual-modal multi-working-fluid combined circulation system according to claim 1, characterized in that: A fourth shut-off valve, a fifth shut-off valve, and a sixth shut-off valve are sequentially installed on the connecting pipelines between the compressor (1) and the third cold end pipeline (11-3), between the hydrogen storage tank (9) and the first cold end pipeline (11-1), and between the oxygen storage tank (10) and the second cold end pipeline (11-2).

4. The dual-modal multi-working-fluid combined circulation system according to claim 1, characterized in that: An eighth shut-off valve and a ninth shut-off valve are sequentially installed on the connecting pipes between the second cold end pipe (11-2) and the cathode of the fuel cell (8) and between the third cold end pipe (11-3) and the combustion chamber (3).

5. The dual-modal multi-working-fluid combined circulation system according to claim 1, characterized in that: A tenth shut-off valve is installed on the connecting pipeline between the hydrogen storage tank (9) and the combustion chamber (3).

6. A dual-modal multi-working-propellant combined circulation method using the system described in any one of claims 1 to 5, characterized in that: When the dual-mode multi-working-fluid combined cycle system is in an atmospheric environment, the first shut-off valve (15) and the second shut-off valve (16) are closed, and the third shut-off valve (17) is open: The generator (5) is powered on and works as a starter, driving the compressor (1) and turbine (2) to rotate. The compressor (1) rotates, draws in air, and pressurizes the air. The pressurized air enters the combustion chamber (3) through the cold end of the regenerator (11) and burns with the hydrogen from the hydrogen storage tank (9) to generate high-temperature and high-pressure gas. The gas enters the turbine (2), expands and does work, the pressure and temperature of the gas decrease, and then enters the hot end of the regenerator (11) through the pipeline, and finally is discharged into the external environment through the first exhaust pipe (12). When the output power of the turbine (2) is greater than the power consumed by the compressor (1), the starter is converted into the generator (5) and outputs electrical power to the battery (4). Hydrogen from hydrogen storage tank (9) and oxygen from oxygen storage tank (10) enter the cold end of regenerator (11) respectively, and use the waste heat of the gas to heat the hydrogen and oxygen, and then send them into the anode and cathode of fuel cell (8) respectively; the fuel cell (8) generates electrical energy through electrochemical reaction and outputs it to the storage battery (4), while the generated gas is discharged into the external environment through the second exhaust pipe (13); When the dual-mode multi-working-medium combined cycle system is in an underwater environment, the third shut-off valve (17) is closed, and the first shut-off valve (15) and the second shut-off valve (16) are open: The generator (5) is energized and acts as a starter, driving the compressor (1) and turbine (2) to rotate; at the same time, the water pump (6) is energized, and the liquid water, after being pressurized by the water pump (6), enters the cold end of the regenerator (11) through the compressor (1) channel; the hydrogen in the hydrogen storage tank (9) and the oxygen in the oxygen storage tank (10) enter the combustion chamber (3) for combustion, generating high-temperature and high-pressure gas; the gas enters the turbine (2), and after expansion and work, the pressure and temperature of the gas decrease, and then the gas enters the turbine. The pressurized liquid water entering the regenerator (11) is heated at the hot end and then discharged into the external environment through the first exhaust pipe (12). The liquid water is heated by the regenerator (11) to form high-temperature and high-pressure water vapor, which enters the combustion chamber (3) and burns together. At this time, the gas gas entering the turbine (2) to expand and do work also increases. The output power of the turbine (2) is greater than the power consumption of the compressor (1), and the starter is converted into a generator (5) to output electrical power to the battery (4). Hydrogen from the hydrogen storage tank (9) and oxygen from the oxygen storage tank (10) enter the cold end of the regenerator (11) respectively. The hydrogen and oxygen are heated by the waste heat of the gas, and then sent to the anode and cathode of the fuel cell (8) respectively. The fuel cell (8) generates electrical energy through chemical reaction and outputs it to the battery (4). At the same time, the generated gas is discharged into the external environment through the second exhaust pipe (13).

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