Closed hydrogen-oxygen fuel cell power generation system

Abstract

The utility model discloses a closed oxyhydrogen fuel cell power generation system which comprises a fuel cell stack and a circulating pump, the fuel cell stack is respectively connected with the circulating pump, an oxygen tank and a hydrogen tank, oxygen is conveyed to the fuel cell stack through the oxygen tank, hydrogen is conveyed to the fuel cell stack through the hydrogen tank, and the circulating pump is connected with the circulating pump. And cyclic utilization of oxygen is realized through the circulating pump. According to the utility model, the unreacted oxygen is recycled through the circulating pump, the pressure of the oxygen and hydrogen before entering the fuel cell stack is monitored while the oxygen and hydrogen are conveyed, and the opening degrees of the oxygen inlet electromagnetic valve and the hydrogen inlet electromagnetic valve are regulated according to the pressure; the problem of backflow caused by too large oxygen pressure of a circulation path before oxygen enters a reactor is solved by arranging a first check valve, gas pumped by a four-way connector cannot reversely flow into a circulation pump by arranging a second check valve, and a hydrogen pulse discharge electromagnetic valve and an oxygen pulse discharge electromagnetic valve are designed to be intermittently opened; hydrogen and oxygen can fully react, and the gas utilization rate is increased.

Description

Technical Field

[0001] This utility model belongs to the field of fuel cell technology, specifically relating to a closed-loop hydrogen-oxygen fuel cell power generation system. Background Technology

[0002] Hydrogen-oxygen fuel cells, as clean energy conversion devices, have demonstrated significant advantages in distributed power generation and mobile power in recent years. Among them, air-cooled hydrogen-oxygen fuel cell systems have attracted much attention due to their compact structure and convenient maintenance. However, most current air-cooled hydrogen-oxygen fuel cell systems use open-type air-cooled stacks, relying on natural convection of ambient air for oxygen supply and thermal management. Unreacted oxygen is directly discharged into the atmosphere, resulting in low oxygen cycle efficiency, low oxygen utilization, and high energy consumption. Utility Model Content

[0003] To address the technical problems existing in the prior art, the purpose of this utility model is to provide a closed-loop hydrogen-oxygen fuel cell power generation system.

[0004] To achieve the above objectives and technical effects, the technical solution adopted by this utility model is as follows:

[0005] A closed-loop hydrogen-oxygen fuel cell power generation system includes a fuel cell stack and a circulation pump. The fuel cell stack is connected to the circulation pump, an oxygen tank, and a hydrogen tank. Oxygen is supplied to the fuel cell stack through the oxygen tank, hydrogen is supplied to the fuel cell stack through the hydrogen tank, and the oxygen is recycled through the circulation pump.

[0006] Furthermore, the fuel cell stack has an oxygen inlet, a hydrogen inlet, an oxygen outlet, and a hydrogen outlet. The oxygen tank is connected to the oxygen inlet via an oxygen silicone tubing, and the hydrogen tank is connected to the hydrogen inlet via a hydrogen silicone tubing. The hydrogen outlet is equipped with a hydrogen pulse exhaust solenoid valve, and the oxygen outlet is equipped with an oxygen pulse exhaust solenoid valve and a shut-off solenoid valve. The hydrogen pulse exhaust solenoid valve and the oxygen pulse exhaust solenoid valve are intermittently opened.

[0007] Furthermore, the oxygen silicone tubing is sequentially equipped with an oxygen cylinder pressure sensor, an oxygen inlet pressure reducing valve, an oxygen inlet solenoid valve, a first inlet pressure sensor, a first check valve, and a four-way connector along the oxygen inflow direction, and the circulation pump is connected to the four-way connector.

[0008] Furthermore, a hydrogen cylinder pressure sensor, a hydrogen inlet pressure reducing valve, a hydrogen inlet solenoid valve, and a second inlet pressure sensor are sequentially arranged along the hydrogen inflow direction on the hydrogen silicone tubing.

[0009] Furthermore, the oxygen outlet is connected to a three-way connector via a silicone tube, which splits into two paths: one path connects to an oxygen pulse solenoid valve, and the other path connects to a shut-off solenoid valve.

[0010] Furthermore, the shut-off solenoid valve is connected to the buffer tank, the buffer tank is connected to the electric drain valve and the inlet of the circulation pump, the outlet of the circulation pump is connected to the second check valve, and the second check valve is connected to the four-way connector through a silicone tube.

[0011] Furthermore, the fuel cell stack is also connected to a centrifugal blower, and a third check valve is installed on the pipeline connecting the two.

[0012] Furthermore, a PTC heater is provided inside the fuel cell stack.

[0013] Furthermore, a cooling fan is provided on the outside of the fuel cell stack.

[0014] Furthermore, it also includes a hydrogen concentration sensor to monitor for hydrogen leaks.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This utility model discloses a closed-loop hydrogen-oxygen fuel cell power generation system. It utilizes a circulation pump to recover and reuse unreacted oxygen, avoiding direct release into the atmosphere. This improves oxygen circulation efficiency and utilization, while reducing energy consumption. Simultaneously, first and second inlet pressure sensors monitor the pressure of oxygen and hydrogen before they enter the fuel cell stack, adjusting the opening of the oxygen and hydrogen inlet solenoid valves accordingly. A first check valve prevents backflow caused by excessive oxygen pressure in the circulation path before oxygen enters the stack. A second check valve prevents gas from flowing back into the circulation pump from the four-way connector. By designing the hydrogen and oxygen pulse exhaust solenoid valves to open intermittently, hydrogen and oxygen can fully react, further improving gas utilization. The overall structure is simple, compatible with various application scenarios, and contributes to the implementation of carbon emission policies. Attached Figure Description

[0017] Figure 1 This is a front view of the present invention;

[0018] Figure 2 This is a rear view of the present invention;

[0019] Figure 3 This is a connection diagram of the present invention. Detailed Implementation

[0020] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the present invention.

[0021] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0022] like Figure 1-3 As shown, a closed-loop hydrogen-oxygen fuel cell power generation system includes an oxygen inlet solenoid valve 1, a first inlet pressure sensor 2, a first check valve 3, a four-way connector 4, a fuel cell stack 5, a PTC heater 6, an oxygen pulse exhaust solenoid valve 7, a shut-off solenoid valve 8, a buffer tank 9, an electric drain valve 10, a circulation pump 11, a second check valve 12, a hydrogen inlet solenoid valve 13, a second inlet pressure sensor 14, a hydrogen pulse exhaust solenoid valve 15, a centrifugal blower 16, a third check valve 17, a cooling fan 18, a hydrogen concentration sensor 19, an oxygen cylinder pressure sensor 20, an oxygen inlet pressure reducing valve 21, a hydrogen cylinder pressure sensor 22, and a hydrogen inlet pressure reducing valve 23. The fuel cell stack 5 has a hydrogen inlet, a hydrogen outlet, an oxygen inlet, and an oxygen outlet. An external oxygen tank is connected to the oxygen inlet via an oxygen silica gel tubing, and an external hydrogen tank is connected to the oxygen inlet via a hydrogen silica gel tubing. The oxygen silica gel pipeline is connected to the hydrogen inlet. Along the oxygen inlet direction, an oxygen cylinder pressure sensor 20, an oxygen inlet pressure reducing valve 21, an oxygen inlet solenoid valve 1, a first inlet pressure sensor 2, a first check valve 3, and a four-way connector 4 are sequentially installed. This allows the pressure of oxygen before it enters the fuel cell stack 5 to be monitored simultaneously with oxygen delivery. Similarly, along the hydrogen inlet silica gel pipeline, a hydrogen cylinder pressure sensor 22, a hydrogen inlet pressure reducing valve 23, a hydrogen inlet solenoid valve 13, and a second inlet pressure sensor 14 are sequentially installed. This allows the pressure of hydrogen before it enters the fuel cell stack 5 to be monitored simultaneously with hydrogen delivery. The first check valve 3 prevents excessive oxygen pressure in the circulation path from causing backflow before oxygen enters the stack, utilizing the one-way shut-off characteristic of the check valve to solve the backflow problem.

[0023] The hydrogen outlet of the fuel cell stack 5 is equipped with a hydrogen pulse solenoid valve 15. The oxygen outlet of the fuel cell stack 5 is connected to a three-way connector via a silicone tube, which splits into two paths. One path is connected to an oxygen pulse solenoid valve 7, and the other path is connected to a shut-off solenoid valve 8. The hydrogen pulse solenoid valve 15 and the oxygen pulse solenoid valve 7 are opened intermittently to allow hydrogen and oxygen to react fully and improve utilization.

[0024] The shut-off solenoid valve 8 is connected to the buffer tank 9 via a silicone tube. The buffer tank 9 is used to reduce the unevenness of the flow in the pipeline. The water produced by the reaction in the fuel cell stack 5 is discharged through the electric drain valve 10 connected to the lower part of the buffer tank 9.

[0025] The air outlet at the top of the buffer tank 9 is connected to the inlet of the circulation pump 11 via a silicone tube. The outlet of the circulation pump 11 is connected to the second check valve 12. The second check valve 12 is connected to the four-way connector 4 via a silicone tube, allowing oxygen from the circulation pump 11 to flow into the fuel cell stack 5. By setting up the circulation pump 11, oxygen circulation is achieved, so that unreacted oxygen can be collected and reused. The design of the second check valve 12 prevents the gas rushing from the four-way connector 4 from flowing back into the circulation pump 11.

[0026] Centrifugal blower 16 is connected to fuel cell stack 5 and is used to extract gas from fuel cell stack 5. A third check valve 17 is installed on the pipeline connecting centrifugal blower 16 and fuel cell stack 5.

[0027] The fuel cell stack 5 is equipped with a PTC heater 6, which is used to keep the temperature inside the stack within a suitable range in low-temperature environments and prevent damage to the stack.

[0028] The fuel cell stack 5 is equipped with a cooling fan 18 on the outside for ventilation and heat dissipation to prevent the stack from being damaged by excessively high temperature.

[0029] The hydrogen concentration sensor 19 is located at the top of the system to monitor for hydrogen leaks.

[0030] To achieve intelligent control, the first intake pressure sensor 2, the second intake pressure sensor 14, the hydrogen concentration sensor 19, the oxygen cylinder pressure sensor 20, and the hydrogen cylinder pressure sensor 22 are connected to the input terminals of a controller (such as a microcontroller, PLC, or CPU). The oxygen inlet solenoid valve 1, the first check valve 3, the PTC heater 6, the oxygen pulse exhaust solenoid valve 7, the shut-off solenoid valve 8, the electric drain valve 10, the circulation pump 11, the second check valve 12, the hydrogen inlet solenoid valve 13, the hydrogen pulse exhaust solenoid valve 15, the centrifugal blower 16, the third check valve 17, the cooling fan 18, the oxygen inlet pressure reducing valve 21, and the hydrogen inlet pressure reducing valve 23 are connected to the output terminals of the controller. The first intake pressure sensor 2 monitors the pressure data of oxygen before it enters the fuel cell stack 5 and transmits it to the controller for analysis and processing. The second intake pressure sensor... 14. Monitors the pressure data of hydrogen before it enters the fuel cell stack 5 and transmits it to the controller for analysis and processing. 19. Monitors the hydrogen content in the environment and transmits it to the controller for analysis and processing. 20. Monitors the oxygen pressure data coming out of the oxygen tank and transmits it to the controller for analysis and processing. 22. Monitors the hydrogen pressure data coming out of the hydrogen tank and transmits it to the controller for analysis and processing. The controller controls the opening and closing of the following valves: oxygen inlet solenoid valve 1, first check valve 3, PTC heater 6, oxygen pulse exhaust solenoid valve 7, shut-off solenoid valve 8, electric drain valve 10, circulation pump 11, second check valve 12, hydrogen inlet solenoid valve 13, hydrogen pulse exhaust solenoid valve 15, centrifugal blower 16, third check valve 17, cooling fan 18, oxygen inlet pressure reducing valve 21, and hydrogen inlet pressure reducing valve 23.

[0031] The parts or structures not specifically described in this utility model can be made using existing technology or existing products, and will not be elaborated here.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A closed-loop hydrogen-oxygen fuel cell power generation system, comprising a fuel cell stack, characterized in that, It also includes a circulation pump. The fuel cell stack is connected to the circulation pump, an oxygen tank, and a hydrogen tank, respectively. Oxygen is supplied to the fuel cell stack through the oxygen tank, hydrogen is supplied to the fuel cell stack through the hydrogen tank, and the circulation pump realizes the recycling of oxygen.

2. The closed-loop hydrogen-oxygen fuel cell power generation system according to claim 1, characterized in that, The fuel cell stack has an oxygen inlet, a hydrogen inlet, an oxygen outlet, and a hydrogen outlet. The oxygen tank is connected to the oxygen inlet via an oxygen silicone tubing, and the hydrogen tank is connected to the hydrogen inlet via a hydrogen silicone tubing. The hydrogen outlet is equipped with a hydrogen pulse solenoid valve, and the oxygen outlet is equipped with an oxygen pulse solenoid valve and a shut-off solenoid valve. The hydrogen pulse solenoid valve and the oxygen pulse solenoid valve are intermittently opened.

3. A closed-loop hydrogen-oxygen fuel cell power generation system according to claim 2, characterized in that, The oxygen silicone tubing is sequentially equipped with an oxygen cylinder pressure sensor, an oxygen inlet pressure reducing valve, an oxygen inlet solenoid valve, a first inlet pressure sensor, a first check valve, and a four-way connector along the oxygen inflow direction. The circulation pump is connected to the four-way connector.

4. A closed-loop hydrogen-oxygen fuel cell power generation system according to claim 2, characterized in that, The hydrogen silicone tubing is sequentially equipped with a hydrogen cylinder pressure sensor, a hydrogen inlet pressure reducing valve, a hydrogen inlet solenoid valve, and a second inlet pressure sensor along the hydrogen inflow direction.

5. A closed-loop hydrogen-oxygen fuel cell power generation system according to claim 2, characterized in that, The oxygen outlet is connected to a three-way connector via a silicone tube, which splits into two paths: one path connects to the oxygen pulse solenoid valve, and the other path connects to the shut-off solenoid valve.

6. A closed-loop hydrogen-oxygen fuel cell power generation system according to claim 5, characterized in that, The shut-off solenoid valve is connected to the buffer tank, which is connected to the electric drain valve and the inlet of the circulation pump. The outlet of the circulation pump is connected to the second check valve, which is connected to the four-way connector via a silicone tube.

7. A closed-loop hydrogen-oxygen fuel cell power generation system according to claim 1, characterized in that, The fuel cell stack is also connected to a centrifugal blower, and a third check valve is installed on the pipeline connecting the two.

8. A closed-loop hydrogen-oxygen fuel cell power generation system according to claim 1, characterized in that, The fuel cell stack is equipped with a PTC heater.

9. A closed-loop hydrogen-oxygen fuel cell power generation system according to claim 1, characterized in that, The fuel cell stack is equipped with a cooling fan on its exterior.

10. A closed-loop hydrogen-oxygen fuel cell power generation system according to any one of claims 1-9, characterized in that, It also includes a hydrogen concentration sensor to monitor for hydrogen leaks.

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