Fuel cell power generation system

Abstract

The utility model relates to the technical field of fuel cells, and discloses a fuel cell power generation system which comprises at least two fuel cell modules which are arranged in parallel; the fuel cell module comprises an electric pile module, a first switch and a second switch, the electric pile module is provided with a cooling inlet and a cooling outlet, the first switch is communicated with the cooling inlet, and the second switch is communicated with the cooling outlet; the cooling module is provided with a water outlet and a water inlet; the water outlets are communicated with the first switches of the at least two fuel cell modules, and the first switches are configured to control the on-off of the cooling inlets of the corresponding electric pile modules and the water outlets; the water inlets are communicated with the second switches of the at least two fuel cell modules, and the second switches are configured to control connection and disconnection of the cooling outlets of the corresponding electric pile modules and the water inlets. According to the fuel cell power generation system disclosed by the utility model, the number of parts and the volume of the whole power generation system are reduced, the cost is saved, and the control flexibility of the fuel cell module is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technology field, concretely relates to a fuel cell power generation system. BACKGROUND

[0002] Fuel cell is a kind of power generation device that the chemical energy of hydrogen and oxidant is directly converted into electric energy by electrochemical reaction, with the advantages of high energy conversion efficiency, no greenhouse gas emission, etc., suitable for automobile, energy storage power station, aerospace and other fields.In the field of energy storage or standby power generation, in order to meet the power generation demand of high power, usually need multiple fuel cell modules to jointly form a set of power generation system.

[0003] In the power generation system of related art, each fuel cell module needs to be equipped with a set of thermal management module, and each fuel cell module cannot be independently controlled, thereby causing the whole power generation system to have many parts, large volume and poor control flexibility. SUMMARY

[0004] Therefore, the utility model provides a kind of fuel cell power generation system to solve the problem of multiple fuel cell module power generation system, many parts, large volume and poor control flexibility.

[0005] In the first aspect, the utility model provides a kind of fuel cell power generation system, comprising: at least two fuel cell modules, at least two fuel cell modules are connected in parallel;Fuel cell module includes electric pile module, first switch and second switch, electric pile module has cooling inlet and cooling outlet, first switch is communicated with cooling inlet, and second switch is communicated with cooling outlet;Cooling module has water outlet and water inlet;Water outlet is communicated with the first switch of at least two fuel cell modules, and first switch is configured to control the on-off of the cooling inlet of corresponding electric pile module and water outlet;Water inlet is communicated with the second switch of at least two fuel cell modules, and second switch is configured to control the on-off of the cooling outlet of corresponding electric pile module and water inlet.

[0006] Optionally, the cooling module includes a main pipeline, a radiator, a filter and a water pump arranged on the main pipeline;The filter is arranged between the radiator and the water pump, one end of the main pipeline close to the water pump forms the water outlet, and the other end of the main pipeline close to the radiator forms the water inlet.

[0007] Optionally, a third switch is further arranged on the main pipeline, and the third switch is arranged between the water inlet and the radiator;The cooling module further includes a branch pipeline and a heater arranged on the branch pipeline;One end of the branch pipeline is communicated with the third switch, and the other end of the branch pipeline is communicated between the filter and the water pump;The third switch is configured to selectively control the communication between the water inlet and the radiator or the communication between the water inlet and the heater.

[0008] Optionally, the fuel cell module further comprises a fourth switch and a fifth switch, the stack module has a hydrogen fuel inlet and a hydrogen fuel outlet, the fourth switch is in communication with the hydrogen fuel inlet, and the fifth switch is in communication with the hydrogen fuel outlet; the fuel cell power generation system further comprises a first fuel module, the first fuel module is configured to supply hydrogen-containing fuel, and the first fuel module has a first fuel inlet and a first fuel return; the first fuel inlet is in communication with the fourth switch of the at least two fuel cell modules, and the fourth switch is configured to control the hydrogen fuel inlet of the corresponding stack module and the first fuel inlet; the first fuel return is in communication with the fifth switch of the at least two fuel cell modules, and the fifth switch is configured to control the hydrogen fuel outlet of the corresponding stack module and the first fuel return.

[0009] Optionally, the first fuel module comprises an ejector and a water distributor, the ejector is configured to be in communication with a hydrogen-containing fuel source and is in communication with the first fuel inlet, and the water distributor is arranged between the ejector and the first fuel return.

[0010] Optionally, the fuel cell power generation system further comprises a second fuel module, the second fuel module is configured to supply oxygen-containing fuel; the second fuel module comprises an air compressor, and the air compressor has a power unit; the first fuel module further comprises a water drain valve, and the water drain valve is arranged between the water distributor and the power unit in a communicable manner.

[0011] Optionally, the fuel cell module further comprises a sixth switch and a seventh switch, the stack module has an oxygen fuel inlet and an oxygen fuel outlet, the sixth switch is in communication with the oxygen fuel inlet, and the seventh switch is in communication with the oxygen fuel outlet; the fuel cell power generation system further comprises a second fuel module, the second fuel module is configured to supply oxygen-containing fuel, and the second fuel module has a second fuel inlet and a second fuel return; the second fuel inlet is in communication with the sixth switch of the at least two fuel cell modules, and the sixth switch is configured to control the oxygen fuel inlet of the corresponding stack module and the second fuel inlet; the second fuel return is in communication with the seventh switch of the at least two fuel cell modules, and the seventh switch is configured to control the oxygen fuel outlet of the corresponding stack module and the second fuel return.

[0012] Optionally, the second fuel module comprises an air filter and an air compressor, the air compressor has a compression unit and a power unit, the air filter is in communication with the compression unit, and the compression unit is in communication with the second fuel inlet; the second fuel return is in communication with the power unit.

[0013] Optionally, the fuel cell module further comprises an intercooler and a humidifier, the humidifier has a first end and a second end capable of heat and moisture exchange, the intercooler is arranged between the sixth switch and the first end in a communicable manner, and the first end is in communication with the oxygen fuel inlet; the second end is arranged between the oxygen fuel outlet and the seventh switch in a communicable manner.

[0014] Optionally, the fuel cell power generation system further comprises a feedback power supply and at least two converters, input ends of the at least two converters are electrically connected with the stack modules of the at least two fuel cell modules respectively, and output ends of the at least two converters are electrically connected with the feedback power supply.

[0015] By the technical scheme of the utility model, at least two fuel cell modules of the fuel cell system can share a set of cooling module, the number of parts and the volume of the whole power generation system are reduced, and cost is saved; and the first switch and the second switch can control the on-off between the fuel cell modules and the cooling module respectively, independent control of each fuel cell module is realized, and flexibility of control of the fuel cell module is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the specific embodiment or prior art of the utility model, the drawings needed to be used in the specific embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Fig. 1 It is a structure schematic view of a fuel cell power generation system of the embodiment of the utility model;

[0018] Fig. 2 It is a connection relationship schematic view between a control module and each module of the embodiment of the utility model;

[0019] Fig. 3 It is a control flow chart of a fuel cell power generation system of the embodiment of the utility model.

[0020] BRIEF DESCRIPTION OF DRAWINGS

[0021] 1, fuel cell module;11, stack module;111, cooling inlet;112, cooling outlet;113, hydrogen fuel inlet;114, hydrogen fuel outlet;115, oxygen fuel inlet;116, oxygen fuel outlet;12, first switch;13, second switch;14, fourth switch;15, fifth switch;16, sixth switch;17, seventh switch;18, intercooler;19, humidifier;

[0022] 2, cooling module;2a, water outlet;2b, water inlet;21, main pipeline;22, branch pipeline;23, radiator;24, filter;25, water pump;26, third switch;27, heater;

[0023] 3, first fuel module;3a, first feeding port;3b, first return port;31, ejector;32, water distributor;33, drain valve;

[0024] 4. The second fuel module; 4a, the second feed port; 4b, the second return port; 41, the air filter; 42, the air compressor;

[0025] 5. The inverter; 51, the inverter A; 52, the inverter B;

[0026] 6. The feedback power supply;

[0027] 7. The control module. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0029] The embodiments of the utility model will be described below in combination with Figs. 1 to 3 .

[0030] According to the embodiments of the utility model, on the one hand, a fuel cell power generation system is provided, as shown in Fig. 1 , comprising at least two fuel cell modules 1 and a cooling module 2, wherein the cooling module 2 is used for heat management of the fuel cell modules 1. Specifically, the at least two fuel cell modules 1 are arranged in parallel, and the fuel cell module 1 comprises a stack module 11, a first switch 12 and a second switch 13. The stack module 11 has a cooling inlet 111 and a cooling outlet 112, the first switch 12 is in communication with the cooling inlet 111, and the second switch 13 is in communication with the cooling outlet 112. Correspondingly, the cooling module 2 has a water outlet 2a and a water inlet 2b. The water outlet 2a is in communication with the first switch 12 of the at least two fuel cell modules 1, and the first switch 12 is configured to control the on-off of the cooling inlet 111 of the corresponding stack module 11 and the water outlet 2a. The water inlet 2b is in communication with the second switch 13 of the at least two fuel cell modules 1, and the second switch 13 is configured to control the on-off of the cooling outlet 112 of the corresponding stack module 11 and the water inlet 2b.

[0031] Understandably, the cooling inlet 111 and the cooling outlet 112 of the stack module 11 are ports at both ends of the cooling flow channel inside the stack module 11, wherein the cooling inlet 111 can supply the cooling medium into the stack module 11, and the cooling medium flows out of the stack module 11 after flowing through the cooling flow channel.

[0032] The number of fuel cell modules 1 is not specifically limited, and only needs to meet the power generation power requirement of the fuel cell power generation system. For example, the fuel cell module 1 can be provided with two groups, three groups, four groups or other numbers.

[0033] In this embodiment, at least two fuel cell modules 1 of the fuel cell system can share a set of cooling modules 2, reducing the number of components and the volume of the entire power generation system, saving costs; and the first switch 12 and the second switch 13 can control the on-off between the fuel cell module 1 and the cooling module 2, respectively, to realize independent control of each fuel cell module 1, and improve the flexibility of the fuel cell module 1 control.

[0034] Understandably, the first switch 12 is connected and arranged between the cooling inlet 111 and the water outlet 2a, and the second switch 13 is connected and arranged between the cooling outlet 112 and the water inlet 2b. The first switch 12 and the second switch 13 can open and close the loop between the cooling module 2 and the stack module 11. For example, the first switch 12 and the second switch 13 can both be two-way valves.

[0035] In some embodiments, the cooling module 2 includes a main pipe 21 and a radiator 23, a filter 24 and a water pump 25 arranged on the main pipe 21. The filter 24 is connected and arranged between the radiator 23 and the water pump 25, one end of the main pipe 21 close to the water pump 25 forms a water outlet 2a, and the other end of the main pipe 21 close to the radiator 23 forms a water inlet 2b. In this way, in at least two fuel cell modules 1, the cooling medium flowing out of the cooling outlet 112 of each stack module 11 is converged to the water inlet 2b, and then sequentially passes through the radiator 23 for heat dissipation and the filter 24 for filtration before entering the water pump 25. The water pump 25 supplies cooling water to the cooling inlet 111 of each stack module 11 through the water outlet 2a to realize cooling circulation. That is, in this embodiment, the heat management of each stack module 11 in at least two fuel cell modules 1 can be realized by a set of radiator 23, filter 24 and water pump 25, reducing the number of components and the volume of the entire machine.

[0036] In some embodiments, the main pipe 21 is further provided with a third switch 26, and the third switch 26 is connected and arranged between the water inlet 2b and the radiator 23. The cooling module 2 further includes a branch pipe 22 and a heater 27 arranged on the branch pipe 22. One end of the branch pipe 22 is connected with the third switch 26, and the other end of the branch pipe 22 is connected between the filter 24 and the water pump 25. The third switch 26 is configured to selectively control the communication between the water inlet 2b and the radiator 23 or the heater 27.

[0037] More specifically, in the low temperature state, the third switch 26 is configured to control the water inlet 2b to communicate with the heater 27; in the normal working state, the third switch 26 is configured to control the water inlet 2b to communicate with the radiator 23. In this way, in the low temperature state, the cooling medium entering the water inlet 2b has a low temperature, and the cooling medium flows into the heater 27 through the third switch 26, is heated, and then flows back to the stack module 11 through the water pump 25 and the water outlet 2a, facilitating the rapid start of the fuel cell power generation system. In the normal working state, the cooling medium entering the water inlet 2b has a high temperature, and the cooling medium flows into the radiator 23 through the third switch 26, is cooled, and then flows into the filter 24 for filtration, and finally flows back to the stack module 11 through the water pump 25 and the water outlet 2a, achieving the cooling of the stack module 11.

[0038] It can be understood that the third switch 26 is communicatively arranged between the water inlet 2b, the radiator 23, and the heater 27, and the third switch 26 can selectively make the water inlet 2b communicate with the radiator 23 and be disconnected from the heater 27, or make the water inlet 2b communicate with the heater 27 and be disconnected from the radiator 23. That is, the third switch 26 can control the cooling medium flowing back to the cooling module 2 to enter the heater 27 for heating or enter the radiator 23 for cooling according to the working state of the fuel cell module 1. Exemplarily, the third switch 26 can be a three-way valve.

[0039] In some embodiments, the fuel cell module 1 further includes a fourth switch 14 and a fifth switch 15, and the stack module 11 has a hydrogen fuel inlet 113 and a hydrogen fuel outlet 114, the fourth switch 14 communicates with the hydrogen fuel inlet 113, and the fifth switch 15 communicates with the hydrogen fuel outlet 114. The fuel cell power generation system further includes a first fuel module 3 for supplying hydrogen-containing fuel. The first fuel module 3 has a first fuel inlet 3a and a first fuel outlet 3b, and the hydrogen-containing fuel can enter the stack module 11 through the first fuel inlet 3a and flow back to the first fuel module 3 through the first fuel outlet 3b after the electrochemical reaction is completed. Among them, the first fuel inlet 3a communicates with the fourth switch 14 of at least two fuel cell modules 1, and the fourth switch 14 is configured to control the hydrogen fuel inlet 113 of the corresponding stack module 11 to be connected or disconnected with the first fuel inlet 3a. The first fuel outlet 3b communicates with the fifth switch 15 of at least two fuel cell modules 1, and the fifth switch 15 is configured to control the hydrogen fuel outlet 114 of the corresponding stack module 11 to be connected or disconnected with the first fuel outlet 3b.

[0040] In the embodiment, the at least two fuel cell modules 1 of the fuel cell system can share one first fuel module 3, thereby reducing the number of components and the volume of the whole power generation system, and saving cost. In addition, the fourth switch 14 and the fifth switch 15 can control the on-off of the fuel cell modules 1 and the first fuel module 3, respectively, thereby realizing independent control of the fuel cell modules 1 and further improving the flexibility of the control of the fuel cell modules 1.

[0041] It can be understood that the fourth switch 14 is arranged in communication between the hydrogen fuel inlet 113 and the first fuel supply port 3a, and the fifth switch 15 is arranged in communication between the hydrogen fuel outlet 114 and the first fuel return port 3b. The fourth switch 14 and the fifth switch 15 can open and close the circuit between the first fuel module 3 and the stack module 11. For example, the fourth switch 14 and the fifth switch 15 can be two-way valves.

[0042] In some embodiments, the first fuel module 3 comprises a hydrogen-containing fuel source for providing hydrogen to the fuel cell modules 1. For example, the hydrogen-containing fuel source can be a hydrogen storage tank or a hydrogen generating device.

[0043] In some embodiments, the first fuel module 3 further comprises an ejector 31 and a water separator 32. The ejector 31 is arranged in communication with the hydrogen-containing fuel source and the first fuel supply port 3a. The water separator 32 is arranged in communication between the ejector 31 and the first fuel return port 3b. In the embodiment, the first fuel module 3 is provided with the ejector 31 and the water separator 32, thereby realizing full utilization of hydrogen. The hydrogen in the hydrogen-containing fuel source is supplied to the fuel cell modules 1 at a suitable pressure through the ejector 31. The ejector 31 can suck the hydrogen in the stack module 11 and return it, and the returned hydrogen is combined with the supplied hydrogen and then supplied to the stack module 11, thereby ensuring sufficient flow. The returned hydrogen is often mixed with water, and the water separator 32 can separate the water from the returned hydrogen.

[0044] In some embodiments, the fuel cell power generation system further comprises a second fuel module 4 for supplying oxygen-containing fuel. The second fuel module 4 comprises an air compressor 42, i.e. an air compressor. The air compressor 42 has a power part and a compression part. The power part drives the compression part to compress air. The structure of the power part depends on the specific type of the air compressor 42. For example, the air compressor 42 is a scroll compressor, and the power part is a turbine end of the air compressor 42. The type of the air compressor 42 is not limited in the present application, as long as it can realize the function of air compression. Correspondingly, the first fuel module 3 further comprises a drain valve 33 arranged in communication between the water separator 32 and the power part. The drain valve 33 can drain the water separated by the water separator 32 into the power part of the air compressor, thereby realizing recycling and saving energy.

[0045] In some embodiments, the fuel cell module 1 further comprises a sixth switch 16 and a seventh switch 17, the stack module 11 has an oxygen fuel inlet 115 and an oxygen fuel outlet 116, the sixth switch 16 is in communication with the oxygen fuel inlet 115, and the seventh switch 17 is in communication with the oxygen fuel outlet 116. The fuel cell power generation system further comprises a second fuel module 4, which is configured to supply oxygen-containing fuel. The second fuel module 4 has a second fuel inlet 4a and a second fuel outlet 4b, the oxygen-containing fuel can enter the stack module 11 through the second fuel inlet 4a, and after the electrochemical reaction is completed, the oxygen-containing fuel can flow back into the second fuel module 4 through the second fuel outlet 4b. Among them, the second fuel inlet 4a is in communication with the sixth switch 16 of at least two fuel cell modules 1, and the sixth switch 16 is configured to control the on-off of the oxygen fuel inlet 115 of the corresponding stack module 11 and the second fuel inlet 4a. The second fuel outlet 4b is in communication with the seventh switch 17 of at least two fuel cell modules 1, and the seventh switch 17 is configured to control the on-off of the oxygen fuel outlet 116 of the corresponding stack module 11 and the second fuel outlet 4b.

[0046] In this embodiment, at least two fuel cell modules 1 of the fuel cell system can share a set of second fuel modules 4, reducing the number of parts and the volume of the entire power generation system, saving costs; and the sixth switch 16 and the seventh switch 17 can control the on-off between the fuel cell module 1 to which they belong and the second fuel module 4, respectively, to realize independent control of each fuel cell module 1, further improving the flexibility of control of each fuel cell module 1.

[0047] It can be understood that the sixth switch 16 is in communication between the oxygen fuel inlet 115 and the second fuel inlet 4a, and the seventh switch 17 is in communication between the oxygen fuel outlet 116 and the second fuel outlet 4b, and the sixth switch 16 and the seventh switch 17 can open and close the loop between the second fuel module 4 and the stack module 11. Exemplarily, the sixth switch 16 and the seventh switch 17 can both be two-way valves.

[0048] In some embodiments, the second fuel module 4 is configured to provide air for the fuel cell module 1, and the oxygen in the air is used for electrochemical reaction with hydrogen, saving costs.

[0049] In some embodiments, the second fuel module 4 comprises an air filter 41 and an air compressor 42, the air compressor 42 has the above-mentioned compression part and power part, the air filter 41 is in communication with the compression part, the compression part is in communication with the second fuel inlet 4a, and the second fuel outlet 4b is in communication with the power part. In this embodiment, the air is filtered by the air filter 41 and then enters the compression part, is compressed and then enters the stack module 11 of the fuel cell module 1 through the second fuel inlet 4a, and after the reaction is completed, enters the power part through the second fuel inlet 4a to realize energy reuse, and then the excess gas is discharged.

[0050] In some embodiments, the fuel cell module 1 further comprises a intercooler 18 and a humidifier 19, the humidifier 19 has a first end and a second end for heat and moisture exchange, the intercooler 18 is arranged in communication between the sixth switch 16 and the first end, and the first end is in communication with the oxygen fuel inlet 115. The second end is arranged in communication between the oxygen fuel outlet 116 and the seventh switch 17. Among them, the intercooler 18 is used to reduce the temperature of the pressurized high-temperature air, and the humidifier 19 is used to humidify the input air. In this embodiment, the air supplied by the second fuel module 4 enters the intercooler 18 through the sixth switch 16, and after the air is cooled, it enters the first end of the humidifier 19. The gas discharged from the oxygen fuel outlet 116 enters the second end of the humidifier 19, and the gas in the first end and the second end exchanges heat and moisture in the humidifier 19, thereby humidifying the gas in the first end.

[0051] In some embodiments, the fuel cell power generation system further comprises a feedback power supply 6 and at least two converters 5, the input ends of the at least two converters 5 are respectively electrically connected with the stack modules 11 of the at least two fuel cell modules 1, and the output ends of the at least two converters 5 are electrically connected with the feedback power supply 6. Specifically, the fuel cell module 1 is connected in series with the converter 5, and the at least two fuel cell modules 1 and the at least two converters 5 are connected in parallel and electrically connected with the feedback power supply 6. In this embodiment, the electric energy generated by each fuel cell module 1 is rectified and converted by the converter 5, and then provided to the load or integrated into the power grid through the feedback power supply 6, which is simple and reliable in structure.

[0052] It can be understood that the number of converters 5 depends on the number of fuel cell modules 1, and the number of the two is the same. For example, the fuel cell module 1 is provided with two, which are fuel cell module A and fuel cell module B, and the converter 5 is provided with two, which are converter A 51 and converter B 52. The positive and negative electrodes of the fuel cell module A are electrically connected with the input end of the converter A 51, and the positive and negative electrodes of the fuel cell module B are electrically connected with the input end of the converter B 52. The output ends of the converter A 51 and the converter B 52 are electrically connected with the feedback power supply 6. For example, the converter 5 is a DC / DC converter.

[0053] In some embodiments, the fuel cell power generation system further comprises a control module 7, as shown in Fig. 2 The control module 7 is electrically connected with the first switch 12, the second switch 13, the third switch 26, the fourth switch 14, the fifth switch 15, the sixth switch 16, the seventh switch 17, the ejector 31, the drain valve 33, the air compressor 42, the water pump 25, the radiator 23, the heater 27, the converter 5 (such as including the converter A 51 and the converter B 52), and the feedback power supply 6, which is fast and efficient in management.

[0054] The fuel cell power generation system of the utility model can independently control the opening and closing of each fuel cell module 1 through the setting of the control module 7 and the first switch 12, the second switch 13, the fourth switch 14, the fifth switch 15, the sixth switch 16 and the seventh switch 17. In actual application, the opening number of the fuel cell module 1 in the power generation system can be flexibly regulated according to the external covering requirement, the power consumption of other parts when the load has low power requirement is reduced, and energy is saved. In addition, when a certain fuel cell module 1 in the fuel cell power generation system works abnormally, the control module 7 can cut off the connection of the corresponding fuel cell module 1 and the external parts (such as the cooling module 2, the first fuel module 3, the second fuel module 4 and the like) through the above-mentioned switches, so as to protect the external parts.

[0055] The control process of the fuel cell power generation system of the utility model is described by taking the fuel cell power generation system including two fuel cell modules 1 as an example, that is, including a fuel cell module A and a fuel cell module B, as shown in the figure, and the specific process is as follows: Fig. 3

[0056] First step: the fuel cell power generation system is started and self-checked, and the actual power supply requirement of the external load is evaluated in real time; if the load requirement is less than or equal to the set power P, the second step is executed; otherwise, the third step is entered.

[0057] Second step: the control module 7 controls the opening of the first switch 12, the second switch 13, the fourth switch 14, the fifth switch 15, the sixth switch 16 and the seventh switch 17 of the fuel cell module A; the first switch 12, the second switch 13, the fourth switch 14, the fifth switch 15, the sixth switch 16 and the seventh switch 17 of the fuel cell module B are closed, the fuel cell module A is operated, the fuel cell module B is not operated, and the fuel cell power generation system is operated at low power.

[0058] Third step: the fuel cell power generation system is self-checked and evaluated in real time, and the actual power supply requirement of the external load is evaluated; when the load requirement is greater than the set power P, the fourth step is executed; otherwise, the fifth step is entered.

[0059] Fourth step: the control module 7 controls and opens the first switch 12, the second switch 13, the fourth switch 14, the fifth switch 15, the sixth switch 16 and the seventh switch 17 of the fuel cell module A and the fuel cell module B, the fuel cell module A and the fuel cell module B are operated, and the fuel cell power generation system is operated at full power.

[0060] Fifth step: the fuel cell power generation system enters the normal working mode.

[0061] ​Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope of the appended claims.

Claims

1. A fuel cell power generation system characterized by comprising: The application relates to a fuel cell system, comprising: at least two fuel cell modules (1) arranged in parallel; the fuel cell module (1) comprises a stack module (11) having a cooling inlet (111) and a cooling outlet (112), a first switch (12) in communication with the cooling inlet (111), and a second switch (13) in communication with the cooling outlet (112); a cooling module (2) having a water outlet (2a) and a water inlet (2b); the water outlet (2a) is in communication with the first switch (12) of the at least two fuel cell modules (1), and the first switch (12) is configured to control the on-off connection between the cooling inlet (111) of the corresponding stack module (11) and the water outlet (2a); the water inlet (2b) is in communication with the second switch (13) of the at least two fuel cell modules (1), and the second switch (13) is configured to control the on-off connection between the cooling outlet (112) of the corresponding stack module (11) and the water inlet (2b).

2. The fuel cell power system of claim 1 wherein, The cooling module (2) comprises a main pipeline (21), a radiator (23), a filter (24) and a water pump (25) arranged on the main pipeline (21); the filter (24) is arranged in communication between the radiator (23) and the water pump (25), one end of the main pipeline (21) close to the water pump (25) forms the water outlet (2a), and the other end of the main pipeline (21) close to the radiator (23) forms the water inlet (2b).

3. The fuel cell power system of claim 2 wherein, A third switch (26) is further arranged on the main pipeline (21) and arranged in communication between the water inlet (2b) and the radiator (23); The cooling module (2) further comprises a branch pipeline (22) and a heater (27) arranged on the branch pipeline (22); one end of the branch pipeline (22) is in communication with the third switch (26), and the other end of the branch pipeline (22) is in communication between the filter (24) and the water pump (25); the third switch (26) is configured to selectively control the communication between the water inlet (2b) and the radiator (23) or the communication between the water inlet (2b) and the heater (27).

4. The fuel cell power system according to any one of claims 1 to 3, characterized by, The fuel cell module (1) further comprises a fourth switch (14) and a fifth switch (15); the stack module (11) has a hydrogen fuel inlet (113) and a hydrogen fuel outlet (114); the fourth switch (14) is in communication with the hydrogen fuel inlet (113), and the fifth switch (15) is in communication with the hydrogen fuel outlet (114). The fuel cell power generation system further comprises a first fuel module (3) for supplying hydrogen-containing fuel, the first fuel module (3) having a first fuel inlet (3a) and a first fuel return (3b); the first fuel inlet (3a) is in communication with the fourth switch (14) of the at least two fuel cell modules (1), and the fourth switch (14) is configured to control the hydrogen fuel inlet (113) of the corresponding stack module (11) and the first fuel inlet (3a); the first fuel return (3b) is in communication with the fifth switch (15) of the at least two fuel cell modules (1), and the fifth switch (15) is configured to control the hydrogen fuel outlet (114) of the corresponding stack module (11) and the first fuel return (3b).

5. The fuel cell power system of claim 4 wherein, The first fuel module (3) comprises an ejector (31) for communicating with a hydrogen-containing fuel source and a water distributor (32) in communication between the ejector (31) and the first fuel return (3b).

6. The fuel cell power system of claim 5 wherein, The fuel cell power generation system further comprises a second fuel module (4) for supplying oxygen-containing fuel; the second fuel module (4) comprises an air compressor (42) having a power part; The first fuel module (3) further comprises a drain valve (33) in communication between the water distributor (32) and the power part.

7. The fuel cell power system of claim 4 wherein, The fuel cell module (1) further comprises a sixth switch (16) and a seventh switch (17), and the stack module (11) has an oxygen fuel inlet (115) and an oxygen fuel outlet (116); the sixth switch (16) is in communication with the oxygen fuel inlet (115), and the seventh switch (17) is in communication with the oxygen fuel outlet (116); The fuel cell power generation system further comprises a second fuel module (4) for supplying oxygen-containing fuel, and the second fuel module (4) has a second fuel inlet (4a) and a second fuel return (4b); the second fuel inlet (4a) is in communication with the sixth switch (16) of the at least two fuel cell modules (1), and the sixth switch (16) is configured to control the oxygen fuel inlet (115) of the corresponding stack module (11) and the second fuel inlet (4a); the second fuel return (4b) is in communication with the seventh switch (17) of the at least two fuel cell modules (1), and the seventh switch (17) is configured to control the oxygen fuel outlet (116) of the corresponding stack module (11) and the second fuel return (4b).

8. The fuel cell power system of claim 7 wherein, The second fuel module (4) comprises an air filter (41) and an air compressor (42), the air compressor (42) has a compression part and a power part, the air filter (41) is communicated with the compression part, and the compression part is communicated with the second feeding port (4a); the second return port (4b) is communicated with the power part.

9. The fuel cell power system of claim 7 wherein, The fuel cell module (1) further comprises an intercooler (18) and a humidifier (19), the humidifier (19) has a first end and a second end which can exchange heat and humidity, the intercooler (18) is arranged between the sixth switch (16) and the first end in communication, and the first end is communicated with the oxygen fuel inlet (115); the second end is arranged between the oxygen fuel outlet (116) and the seventh switch (17) in communication.

10. The fuel cell power system of claim 7 wherein, The fuel cell power generation system further comprises a feedback power supply (6) and at least two converters (5), the input ends of the at least two converters (5) are respectively electrically connected with the stack module (11) of the at least two fuel cell modules (1), and the output ends of the at least two converters (5) are electrically connected with the feedback power supply (6).

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