Composite fuel cell power generation system

Abstract

The utility model provides a combined type fuel cell power generation system which comprises a fuel cell stack, a semiconductor temperature difference stack, an air compressor and a heat exchanger, cooling liquid is input into a cooling liquid inlet of the fuel cell stack, and a cooling liquid outlet of the fuel cell stack is connected to a cooling liquid inlet of the heat exchanger. A cooling liquid outlet of the heat exchanger is connected to a cooling liquid inlet of the high-temperature end of the semiconductor thermoelectric pile, an air outlet of the air compressor is connected to an air inlet of the heat exchanger, and an air outlet of the heat exchanger is connected to an air inlet of the fuel cell pile; wherein in the heat exchanger, the compressed air output by the air compressor exchanges heat with the cooling liquid output by the fuel cell stack, so that the temperature of the cooling liquid entering the high-temperature end is increased. According to the scheme, the existing relatively mature semiconductor thermoelectric power generation technology is combined, the heat energy of the fuel cell stack absorbed by the cooling liquid during working and the heat energy of the air compressed by the air compressor are effectively utilized for secondary power generation, and the power generation efficiency of the fuel cell power generation system is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cells, and in particular to a composite fuel cell power generation system. Background Art

[0002] Fuel cell power generation system refers to the use of hydrogen provided by a designated storage system and oxygen in the external air to perform electrochemical reactions to generate the electricity required by users. The main emission of hydrogen combustion is water, which can achieve zero emission and no pollution. Hydrogen energy can solve the problems caused by fossil fuels. However, due to the constraints of various conditions, the conversion efficiency of fuel cell power generation system can only reach about 50% at present, and the rest of the energy is dissipated in the form of heat.

[0003] In most of the fuel cell power generation systems currently in use, the traditional solutions to the problem of low efficiency of fuel cell power generation systems generally adopt the following methods:

[0004] One is to adopt a combined heat and power system. Without changing the power generation efficiency of the fuel cell, the heat energy generated during the operation of the fuel cell power generation system is no longer dissipated in the form of heat dissipation. Instead, the heat energy in the fuel cell power generation system is collected through a heat exchanger. By collecting and storing heat energy, users can use it when they need it, thereby improving the overall system efficiency of the fuel cell power generation system, including heat energy, to some extent.

[0005] The second is to reduce the power output of the fuel cell power generation system, increase the cell voltage of the fuel cell single cell, reduce the ohmic loss of the fuel cell single cell, and thus indirectly improve the power generation efficiency of the fuel cell system.

[0006] The third is to improve the power generation efficiency of the fuel cell system by updating some technologies, hardware and materials, reducing various losses during the system operation and the power consumption of auxiliary systems.

[0007] In a fuel cell power generation system, the above method can improve the power generation efficiency and the overall efficiency of the fuel cell power generation system to a certain extent in different application scenarios, but its application has the following disadvantages and limitations:

[0008] 1. Although the fuel cell cogeneration system is an effective means to improve the overall efficiency of the fuel cell system when users need to use additional energy to produce heat energy, the user's demand for heat energy varies greatly in different seasons and different usage scenarios. Therefore, the fuel cell cogeneration system still has limitations in use. At the same time, the cogeneration system improves the overall efficiency of the system, but cannot improve the power generation efficiency of the fuel cell system.

[0009] Second, reducing the power output of the fuel cell power generation system and increasing the single cell voltage of the fuel cell can improve the power generation efficiency of the fuel cell power generation system to a certain extent. However, under the premise of the same power generation, a larger fuel cell power generation system must be used to meet the requirements, thereby increasing the overall cost of the fuel cell power generation system. In addition, increasing the single cell voltage of the fuel cell may affect the life of the fuel cell system.

[0010] 3. Improving the power generation efficiency of fuel cell power generation systems by improving software, hardware and material technology has always been the goal of technical developers, but this type of technology improvement is generally technically difficult, requires high investment, has a long cycle, and has high risks, and may not necessarily produce the desired results.

[0011] Therefore, the problem of low power generation efficiency of existing fuel cell power generation systems has not been well solved, and it is necessary to study new solutions. Utility Model Content

[0012] The utility model provides a composite fuel cell power generation system to solve the problem of low power generation efficiency of the fuel cell power generation system in the prior art.

[0013] In order to solve the above problems, the utility model provides a composite fuel cell power generation system, including a fuel cell stack, a semiconductor thermocouple, an air compressor and a heat exchanger, wherein the coolant inlet of the fuel cell stack inputs coolant, the coolant outlet of the fuel cell stack is connected to the coolant inlet of the heat exchanger, the coolant outlet of the heat exchanger is connected to the coolant inlet of the high-temperature end of the semiconductor thermocouple, the air outlet of the air compressor is connected to the air inlet of the heat exchanger, and the air outlet of the heat exchanger is connected to the air inlet of the fuel cell stack; wherein, in the heat exchanger, the compressed air output by the air compressor exchanges heat with the coolant output by the fuel cell stack to increase the temperature of the coolant entering the high-temperature end.

[0014] Furthermore, the low temperature end of the semiconductor thermocouple has an air inlet and an air outlet. The air inlet of the low temperature end is used to input external air. After the external air enters the low temperature end for heat exchange, it is output through the air outlet of the low temperature end.

[0015] Furthermore, the air outlet of the low temperature end is connected to the air inlet of the air compressor.

[0016] Furthermore, the composite fuel cell power generation system includes a first air delivery pipe, a second air delivery pipe, a third air delivery pipe and a fourth air delivery pipe. The first air delivery pipe is connected to the air inlet of the low-temperature end, the two ends of the second air delivery pipe are respectively connected to the air outlet of the low-temperature end and the air inlet of the air compressor, the two ends of the third air delivery pipe are respectively connected to the air outlet of the air compressor and the air inlet of the heat exchanger, and the two ends of the fourth air delivery pipe are respectively connected to the air outlet of the heat exchanger and the air inlet of the fuel cell stack.

[0017] Furthermore, the composite fuel cell power generation system includes a first water delivery pipe, a second water delivery pipe, a third water delivery pipe and a fourth water delivery pipe. The first water delivery pipe is connected to the coolant inlet of the fuel cell stack, the two ends of the second water delivery pipe are respectively connected to the coolant outlet of the fuel cell and the coolant inlet of the heat exchanger, the two ends of the third water delivery pipe are respectively connected to the coolant outlet of the heat exchanger and the coolant inlet of the high-temperature end, and the fourth water delivery pipe is connected to the coolant outlet of the high-temperature end.

[0018] Furthermore, the heat exchanger is a shell and tube heat exchanger, the coolant outlet and the coolant inlet of the heat exchanger are both connected to the tube side of the heat exchanger, and the air inlet and the air outlet of the heat exchanger are both connected to the shell side of the heat exchanger.

[0019] Furthermore, the composite fuel cell power generation system also includes a first DC-DC converter and a second DC-DC converter, the first DC-DC converter is electrically connected to the power output end of the fuel cell stack, and the second DC-DC converter is electrically connected to the power output end of the semiconductor thermocouple.

[0020] Furthermore, the composite fuel cell power generation system also includes a first power output line and a second power output line. The power output end of the fuel cell stack is connected to the first DC-DC converter via the first power output line, and the power output end of the semiconductor thermocouple is connected to the second DC-DC converter via the second power output line.

[0021] Furthermore, the composite fuel cell power generation system further includes a third power output line, and the first DC-DC converter and the second DC-DC converter are both connected to the third power output line.

[0022] Furthermore, the composite fuel cell power generation system also includes an air output pipe, a hydrogen input pipe and a hydrogen output pipe, the air output pipe is connected to the air outlet of the fuel cell stack, the hydrogen input pipe is connected to the hydrogen inlet of the fuel cell stack, and the hydrogen output pipe is connected to the hydrogen outlet of the fuel cell stack.

[0023] The technical solution of the utility model is applied to provide a composite fuel cell power generation system, including a fuel cell stack, a semiconductor thermocouple, an air compressor and a heat exchanger, wherein the coolant inlet of the fuel cell stack inputs coolant, the coolant outlet of the fuel cell stack is connected to the coolant inlet of the heat exchanger, the coolant outlet of the heat exchanger is connected to the coolant inlet of the high temperature end of the semiconductor thermocouple, the air outlet of the air compressor is connected to the air inlet of the heat exchanger, and the air outlet of the heat exchanger is connected to the air inlet of the fuel cell stack; wherein, in the heat exchanger, the compressed air output by the air compressor heats the coolant output by the fuel cell stack. In this solution, on the basis of the traditional fuel cell power generation system, combined with the existing more mature semiconductor thermocouple power generation technology, the heat energy of the fuel cell stack absorbed by the coolant during operation and the heat energy of the air compressed by the air compressor are effectively used for secondary power generation. This solution does not require major technical changes to the existing fuel cell power generation system, and the recovered heat energy is converted into electrical energy for use, thereby effectively improving the power generation efficiency of the fuel cell power generation system under the technical conditions of the existing fuel cell power generation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0025] Figure 1 A schematic diagram of a composite fuel cell power generation system provided by an embodiment of the utility model is shown.

[0026] The above drawings include the following reference numerals:

[0027] 10. Fuel cell stack;

[0028] 20. Semiconductor thermocouple reactor;

[0029] 30. Air compressor;

[0030] 40. Heat exchanger;

[0031] 51. first air delivery pipe; 52. second air delivery pipe; 53. third air delivery pipe; 54. fourth air delivery pipe; 55. air output pipe;

[0032] 61, first water delivery pipe; 62, second water delivery pipe; 63, third water delivery pipe; 64, fourth water delivery pipe;

[0033] 71. A first DC-DC converter; 72. A second DC-DC converter;

[0034] 81, first power output line; 82, second power output line; 83, third power output line;

[0035] 91. Hydrogen inlet pipe; 92. Hydrogen outlet pipe. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0037] like Figure 1 As shown, an embodiment of the utility model provides a composite fuel cell power generation system, including a fuel cell stack 10, a semiconductor thermocouple 20, an air compressor 30 and a heat exchanger 40, wherein the coolant inlet of the fuel cell stack 10 inputs coolant, the coolant outlet of the fuel cell stack 10 is connected to the coolant inlet of the heat exchanger 40, the coolant outlet of the heat exchanger 40 is connected to the coolant inlet of the high-temperature end of the semiconductor thermocouple 20, the air outlet of the air compressor 30 is connected to the air inlet of the heat exchanger 40, and the air outlet of the heat exchanger 40 is connected to the air inlet of the fuel cell stack 10; wherein, in the heat exchanger 40, the compressed air output by the air compressor 30 exchanges heat with the coolant output by the fuel cell stack 10 to increase the temperature of the coolant entering the high-temperature end.

[0038] In this solution, on the basis of the traditional fuel cell power generation system, combined with the existing relatively mature semiconductor temperature difference power generation technology, the heat energy of the fuel cell stack 10 absorbed by the coolant during operation and the heat energy of the air compressed by the air compressor 30 are effectively used for secondary power generation. This solution does not require major technical changes to the existing fuel cell power generation system, and the recovered heat energy is converted into electrical energy for use, thereby effectively improving the power generation efficiency of the fuel cell power generation system under the technical conditions of the existing fuel cell power generation system.

[0039] In this solution, the low temperature end of the semiconductor thermocouple 20 has an air inlet and an air outlet. The air inlet of the low temperature end is used to input external air. After the external air enters the low temperature end for heat exchange, it is output through the air outlet of the low temperature end. In this way, the low temperature end achieves low temperature by inputting external air, thereby achieving a temperature difference with the high temperature end, and generating electricity through the temperature difference. The low temperature end achieves low temperature by inputting external air, and the structure is simple and the cost is low.

[0040] Furthermore, the air outlet at the low temperature end is connected to the air inlet of the air compressor 30. In this way, the air entering the low temperature end can continue to enter the air compressor 30 to supply air for the air compressor. In this way, there is no need to set an air delivery pump for the air inlet of the low temperature end, which simplifies the structure of the device. It can be understood that after being compressed by the air compressor 30, high-temperature and high-pressure air will be output. The air compressor 30 is set at the air outlet of the low temperature end, which can not only realize the air delivery of the low temperature end, but also reduce the impact of the compressed high-temperature air on the low temperature end. In addition, the air temperature at the inlet end of the heat exchanger 40 can be further increased, which is conducive to heat exchange and heating of the coolant in the heat exchanger 40 to increase the temperature of the high temperature end, thereby increasing the temperature difference between the high temperature end and the low temperature end, and further improving the power generation efficiency of the semiconductor thermocouple 20.

[0041] like Figure 1 As shown, the composite fuel cell power generation system includes a first air delivery pipe 51, a second air delivery pipe 52, a third air delivery pipe 53 and a fourth air delivery pipe 54. The first air delivery pipe 51 is connected to the air inlet of the low-temperature end, the two ends of the second air delivery pipe 52 are respectively connected to the air outlet of the low-temperature end and the air inlet of the air compressor 30, the two ends of the third air delivery pipe 53 are respectively connected to the air outlet of the air compressor 30 and the air inlet of the heat exchanger 40, and the two ends of the fourth air delivery pipe 54 are respectively connected to the air outlet of the heat exchanger 40 and the air inlet of the fuel cell stack 10.

[0042] In this way, the air flows through the air compressor 30 , the heat exchanger 40 , and the fuel cell stack 10 through a plurality of air delivery pipes, thereby heating the coolant in the heat exchanger 40 and supplying the fuel cell stack 10 with oxygen required for the reaction.

[0043] like Figure 1 As shown, the composite fuel cell power generation system includes a first water delivery pipe 61, a second water delivery pipe 62, a third water delivery pipe 63 and a fourth water delivery pipe 64. The first water delivery pipe 61 is connected to the coolant inlet of the fuel cell stack 10, the two ends of the second water delivery pipe 62 are respectively connected to the coolant outlet of the fuel cell and the coolant inlet of the heat exchanger 40, the two ends of the third water delivery pipe 63 are respectively connected to the coolant outlet of the heat exchanger 40 and the coolant inlet of the high-temperature end, and the fourth water delivery pipe 64 is connected to the coolant outlet of the high-temperature end.

[0044] In this way, the coolant is transported through multiple water pipes to cool the fuel cell stack 10 through the coolant and transfer the absorbed heat. After the coolant enters the heat exchanger 40, it continues to be heated by the high-temperature air in the heat exchanger 40, thereby absorbing the heat in the high-temperature air and heating up again. Then the coolant enters the high-temperature end of the semiconductor thermocouple 20 at a higher temperature, so that there is a large temperature difference between the high-temperature end and the low-temperature end of the semiconductor thermocouple 20, thereby realizing secondary power generation, thereby recovering heat energy and improving the power generation efficiency of the system.

[0045] The heat exchanger 40 is a shell and tube heat exchanger 40, the coolant outlet and the coolant inlet of the heat exchanger 40 are connected to the tube side of the heat exchanger 40, and the air inlet and the air outlet of the heat exchanger 40 are connected to the shell side of the heat exchanger 40. This configuration has a simple structure and high heat exchange efficiency. Of course, the heat exchanger 40 can also be configured as other types of heat exchangers.

[0046] In this embodiment, the composite fuel cell power generation system also includes a first DC-DC converter 71 and a second DC-DC converter 72. The first DC-DC converter 71 is electrically connected to the power output end of the fuel cell stack 10, and the second DC-DC converter 72 is electrically connected to the power output end of the semiconductor thermocouple 20.

[0047] The first DC-DC converter 71 converts the voltage output by the fuel cell stack 10 into a required voltage level for use, and the second DC-DC converter 72 converts the voltage output by the semiconductor thermocouple 20 into a required voltage level for use.

[0048] In this solution, the composite fuel cell power generation system further includes a first power output line 81 and a second power output line 82. The power output end of the fuel cell stack 10 is connected to the first DC-DC converter 71 through the first power output line 81, and the power output end of the semiconductor thermocouple 20 is connected to the second DC-DC converter 72 through the second power output line 82. The composite fuel cell power generation system also includes a third power output line 83, and the first DC-DC converter 71 and the second DC-DC converter 72 are both connected to the third power output line 83. In this way, the current output by the fuel cell stack 10 and the semiconductor thermocouple 20 is combined into the third power output line 83, and power is supplied to the outside through the third power output line 83.

[0049] Furthermore, the composite fuel cell power generation system further includes an air output pipe 55, a hydrogen input pipe 91 and a hydrogen output pipe 92, wherein the air output pipe 55 is connected to the air outlet of the fuel cell stack 10, the hydrogen input pipe 91 is connected to the hydrogen inlet of the fuel cell stack 10, and the hydrogen output pipe 92 is connected to the hydrogen outlet of the fuel cell stack 10. The above arrangement supplies oxygen and hydrogen required for the reaction to the fuel cell stack 10, and discharges the reacted gas.

[0050] The composite fuel cell power generation system provided by this solution comprehensively considers the different temperature requirements of the fuel cell stack 10 and the semiconductor thermocouple 20 during operation, and organically integrates them. The heat energy generated during the operation of the fuel cell stack 10 is taken out through the coolant, and heat is exchanged with the high-temperature gas output by the air compressor 30 through the heat exchanger 40. After further increasing the temperature of the coolant, the heated coolant is input into the semiconductor thermocouple 20, which can further increase the temperature difference between the cold and hot ends of the semiconductor thermocouple 20 and improve the power generation efficiency. The compressed air after cooling is input into the fuel cell stack 10 through the pipeline to meet the demand for compressed air required for the normal operation of the fuel cell stack 10.

[0051] Compared with traditional solutions, this solution, relative to existing fuel cell power generation systems, utilizes the relatively mature semiconductor temperature difference power generation technology to form a fuel cell gas-liquid composite stack power generation technology, and conducts secondary comprehensive utilization of the heat energy generated during the operation of the fuel cell stack. The semiconductor temperature difference power generation technology is used to generate secondary power from the generated heat energy, which can improve the overall power generation power and efficiency of the fuel cell power generation system, reduce the use of hydrogen and reduce the power consumption of the auxiliary system of the fuel cell power generation system. At the same time, compared with improving software, hardware and material technology to improve the power generation efficiency of the fuel cell power generation system, it has outstanding advantages such as low investment, stable effect and long life.

[0052] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0053] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0054] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of this solution. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being only exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0055] In the description of this scheme, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing this scheme and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the scope of protection of this scheme; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0056] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0057] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this scheme.

Claims

1. A composite fuel cell power generation system, characterized in that: The invention comprises a fuel cell stack (10), a semiconductor thermocouple (20), an air compressor (30) and a heat exchanger (40); the coolant inlet of the fuel cell stack (10) inputs coolant; the coolant outlet of the fuel cell stack (10) is connected to the coolant inlet of the heat exchanger (40); the coolant outlet of the heat exchanger (40) is connected to the coolant inlet of the high-temperature end of the semiconductor thermocouple (20); the air outlet of the air compressor (30) is connected to the air inlet of the heat exchanger (40); and the air outlet of the heat exchanger (40) is connected to the air inlet of the fuel cell stack (10); wherein, in the heat exchanger (40), the compressed air output by the air compressor (30) exchanges heat with the coolant output by the fuel cell stack (10) to increase the temperature of the coolant entering the high-temperature end.

2. The hybrid fuel cell power generation system according to claim 1, characterized in that: The low temperature end of the semiconductor thermocouple (20) has an air inlet and an air outlet. The air inlet of the low temperature end is used to input external air. After the external air enters the low temperature end for heat exchange, it is output through the air outlet of the low temperature end.

3. The hybrid fuel cell power generation system according to claim 2, characterized in that: The air outlet of the low temperature end is connected to the air inlet of the air compressor (30).

4. The hybrid fuel cell power generation system according to claim 3, characterized in that: The composite fuel cell power generation system comprises a first air delivery pipe (51), a second air delivery pipe (52), a third air delivery pipe (53) and a fourth air delivery pipe (54), wherein the first air delivery pipe (51) is connected to the air inlet of the low-temperature end, the two ends of the second air delivery pipe (52) are respectively connected to the air outlet of the low-temperature end and the air inlet of the air compressor (30), the two ends of the third air delivery pipe (53) are respectively connected to the air outlet of the air compressor (30) and the air inlet of the heat exchanger (40), and the two ends of the fourth air delivery pipe (54) are respectively connected to the air outlet of the heat exchanger (40) and the air inlet of the fuel cell stack (10).

5. The composite fuel cell power generation system according to any one of claims 1 to 4, characterized in that: The composite fuel cell power generation system comprises a first water delivery pipe (61), a second water delivery pipe (62), a third water delivery pipe (63) and a fourth water delivery pipe (64), wherein the first water delivery pipe (61) is connected to the coolant inlet of the fuel cell stack (10), the two ends of the second water delivery pipe (62) are respectively connected to the coolant outlet of the fuel cell and the coolant inlet of the heat exchanger (40), the two ends of the third water delivery pipe (63) are respectively connected to the coolant outlet of the heat exchanger (40) and the coolant inlet of the high-temperature end, and the fourth water delivery pipe (64) is connected to the coolant outlet of the high-temperature end.

6. The composite fuel cell power generation system according to any one of claims 1 to 4, characterized in that: The heat exchanger (40) is a shell and tube type heat exchanger (40), the coolant outlet and the coolant inlet of the heat exchanger (40) are both connected to the tube side of the heat exchanger (40), and the air inlet and the air outlet of the heat exchanger (40) are both connected to the shell side of the heat exchanger (40).

7. The composite fuel cell power generation system according to any one of claims 1 to 4, characterized in that: The composite fuel cell power generation system further comprises an air output pipe (55), a hydrogen input pipe (91) and a hydrogen output pipe (92); the air output pipe (55) is connected to the air outlet of the fuel cell stack (10); the hydrogen input pipe (91) is connected to the hydrogen inlet of the fuel cell stack (10); and the hydrogen output pipe (92) is connected to the hydrogen outlet of the fuel cell stack (10).

8. The composite fuel cell power generation system according to any one of claims 1 to 4, characterized in that: The composite fuel cell power generation system further comprises a first DC-DC converter (71) and a second DC-DC converter (72), wherein the first DC-DC converter (71) is electrically connected to the power output end of the fuel cell stack (10), and the second DC-DC converter (72) is electrically connected to the power output end of the semiconductor thermocouple (20).

9. The hybrid fuel cell power generation system according to claim 8, characterized in that: The composite fuel cell power generation system further comprises a first power output line (81) and a second power output line (82); the power output end of the fuel cell stack (10) is connected to the first DC-DC converter (71) via the first power output line (81); and the power output end of the semiconductor thermocouple (20) is connected to the second DC-DC converter (72) via the second power output line (82).

10. The hybrid fuel cell power generation system according to claim 8, characterized in that: The composite fuel cell power generation system further comprises a third power output line (83), and the first DC-DC converter (71) and the second DC-DC converter (72) are both connected to the third power output line (83).

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