Gas supply system of fuel cell

Abstract

The embodiment of the invention discloses a gas supply system of a fuel cell. The gas supply system comprises an oxygen supply module, an air supply module and a gas mixing module, the oxygen supply module comprises an oxygen source which is used for providing oxygen; the air supply module is used for providing air; the gas mixing module communicates with the oxygen supply module and the air supply module, the gas mixing module is used for mixing oxygen and air to obtain mixed gas, and the oxygen concentration in the mixed gas is adjustable; and the gas mixing module is also communicated with the cathode of the fuel cell and is used for supplying mixed gas to the fuel cell. The gas supply system provided by the embodiment of the invention is used for supplying gas to the cathode of the fuel cell, so that the fuel cell can be conveniently applied to a high-altitude area, and the system efficiency and reliability of the fuel cell can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of fuel cells, and in particular to a gas supply system for a fuel cell. Background Art

[0002] In the related art, the fuel cell uses an air supply module to supply air to its cathode. The air supply module includes an air compressor. The air compressor compresses the air to a certain pressure and then supplies it to the fuel cell for use. However, when a fuel cell with this structure is used in high-altitude areas, it is necessary to increase the maximum speed of the air compressor and optimize the opening of the back pressure valve to increase the air flow. This results in a large load on the air compressor, thereby increasing the energy consumption of the fuel cell system and reducing the system efficiency. In addition, in high-altitude areas, the air compressor is prone to operate in a low-flow and high-pressure ratio area, resulting in an increased risk of air compressor surge and a relatively low reliability of the fuel cell. In other words, fuel cells with this structure are difficult to apply to high-altitude areas. Summary of the invention

[0003] In view of this, an embodiment of the present application hopes to provide a fuel cell gas supply system, which is intended to facilitate the application of fuel cells in high-altitude areas and also help improve the system efficiency and reliability of the fuel cell.

[0004] To solve the above problems, the technical solution of the embodiment of the present application is implemented as follows:

[0005] The present application provides a fuel cell gas supply system, including:

[0006] An oxygen supply module, comprising an oxygen source, wherein the oxygen source is used to provide oxygen;

[0007] An air supply module, for providing air;

[0008] A gas mixing module is connected to the oxygen supply module and the air supply module respectively, and is used to mix the oxygen and the air to obtain a mixed gas, and the oxygen concentration in the mixed gas is adjustable; the gas mixing module is also connected to the cathode of the fuel cell, and is used to supply the mixed gas to the fuel cell.

[0009] In some embodiments, the oxygen supply module further comprises a decompression unit, which is disposed downstream of the oxygen source and is used to control the supply pressure of the oxygen source; and / or,

[0010] The oxygen supply module further includes a first flow control unit, which is disposed downstream of the oxygen source and is used to control the supply flow of the oxygen source.

[0011] In some embodiments, the air supply module includes an air compressor and a second flow control unit, the inlet of the air compressor is connected to the atmosphere, and the outlet is connected to the gas mixing module through the second flow control unit, and the second flow control unit is used to control the supply flow of the air.

[0012] In some embodiments, the gas mixing module includes a gas mixing unit and a gas storage unit that are interconnected, the gas mixing unit is respectively connected to the oxygen supply module and the air supply module, and can mix the oxygen and the air to obtain the mixed gas; the gas storage unit is used to store the mixed gas and can supply the mixed gas to the fuel cell.

[0013] In some embodiments, the gas mixing module also includes a circulation pipeline and a driving member, wherein both ends of the circulation pipeline are respectively connected to two different positions of the gas storage unit, and the driving member is arranged on the circulation pipeline and can drive the mixed gas to flow from one end of the circulation pipeline to the other end.

[0014] In some embodiments, the gas circulation module further includes an oxygen concentration monitoring component, and the oxygen concentration monitoring component is used to monitor the oxygen concentration of the mixed gas in the gas storage unit.

[0015] In some embodiments, the gas circulation module further includes a pressure relief pipeline and a pressure relief valve, one end of the pressure relief pipeline is connected to the gas storage unit, and the other end is connected to the outside of the gas storage unit, and the pressure relief valve is arranged on the pressure relief pipeline.

[0016] In some embodiments, the gas circulation module further includes a pressure monitoring component, and the pressure monitoring component is used to monitor the pressure of the mixed gas in the gas storage unit.

[0017] In some embodiments, the air supply module includes an air compressor, an inlet of the air compressor is connected to the atmosphere, an outlet of the air compressor is connected to the gas mixing unit, and the other end of the pressure relief line is connected to the inlet of the air compressor.

[0018] In some embodiments, the oxygen provided by the oxygen source is high purity oxygen; and / or,

[0019] The fuel cell is a proton exchange membrane fuel cell.

[0020] The gas supply system of the fuel cell of the embodiment of the present application uses a mixed gas of oxygen and air to supply gas to the cathode of the fuel cell. When the fuel cell is used in high-altitude areas, even if the air in the high-altitude areas is relatively thin, the oxygen supply to the cathode of the fuel cell can be guaranteed by the oxygen source, that is, the gas supply system does not need to rely too much on the air supply module to provide oxygen, which is conducive to controlling the load of the air supply module within a relatively reasonable range, thereby facilitating the improvement of the system efficiency and reliability of the fuel cell, and thus facilitating the application of the fuel cell in high-altitude areas. In addition, by mixing oxygen and air through the gas mixing module, oxygen and air can be evenly mixed, so that the oxygen concentration in the mixed gas can be in a relatively stable state, which is conducive to the stability of the operation of the fuel cell; the oxygen concentration in the mixed gas is adjustable, so that the oxygen concentration in the mixed gas can be adjusted according to actual needs, thereby facilitating the optimization of the performance of the fuel cell.

[0021] In addition, the oxygen concentration in the mixed gas is higher than the oxygen concentration in the air. Under the condition that the gas supply volume remains unchanged, the gas supply system of the embodiment of the present application is used to supply the mixed gas to the fuel cell, which is beneficial to increase the oxygen supply to the cathode of the fuel cell, thereby helping to improve the performance of the fuel cell and enhance the power generation capacity of the fuel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a gas supply system for a fuel cell according to an embodiment of the present application.

[0023] Description of Reference Numerals

[0024] 10. Oxygen supply module; 11. Oxygen source; 12. Decompression unit; 13. First flow control unit; 20. Air supply module; 21. Air compressor; 22. Second flow control unit; 30. Gas mixing module; 31. Gas mixing unit; 32. Gas storage unit; 33. Circulation pipeline; 34. Driving element; 35. Oxygen concentration monitoring element; 36. Pressure relief pipeline; 37. Pressure relief valve; 38. Pressure monitoring element; 200. Fuel cell; 210. Hydrogen supply and circulation unit; 220. Exhaust emission unit. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and are therefore only used as examples, and the protection scope of the present application cannot be limited by this. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0026] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0028] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0029] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0031] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] In plateau environments, photovoltaic power generation is increasingly used as a source of electricity. As a renewable energy technology, photovoltaic power generation has many advantages, but it also has some disadvantages and challenges, especially its intermittent operation. Photovoltaic power generation systems can only generate electricity during the day when there is sunlight, but cannot work at night, which does not match people's electricity needs. With the development of hydrogen energy, hydrogen can be used as an intermediate energy storage medium to achieve continuous use of electricity. The conversion of hydrogen into electricity relies on hydrogen fuel cell devices. However, in plateau environments, hydrogen fuel cells face challenges such as thin air, low temperature and low air pressure. These factors will affect the water management, temperature control and performance of the fuel cell.

[0033] In order to adapt to the plateau environment, the fuel cell system will be specially designed and optimized. In terms of air supply, the air in the plateau is thin and the oxygen partial pressure is low, so the performance of the air compressor needs to be optimized to ensure sufficient oxygen supply.

[0034] In the related art, for example, the air flow rate can be increased by increasing the maximum speed of the air compressor and optimizing the opening of the back pressure valve, thereby increasing the output power of the fuel cell. However, as the altitude increases, the efficiency of the fuel cell system will be affected. In high altitude areas, in order to provide sufficient oxygen, it may be necessary to increase the load of the air compressor, which will increase the energy consumption of the system and thus reduce the efficiency of the system. In addition, in plateau environments, the air compressor may operate in a low flow and high pressure ratio area, and the risk of surge increases. Since the plateau environment may accelerate material aging and performance degradation, the fuel cell's air supply system needs to have high durability and reliability. In other words, the fuel cells in the related art are difficult to apply to high altitude areas.

[0035] In view of this, the present application embodiment provides a fuel cell gas supply system, please refer to Figure 1 The gas supply system includes an oxygen supply module 10 , an air supply module 20 and a gas mixing module 30 .

[0036] The specific type of the fuel cell 200 is not limited. For example, the fuel cell 200 may be a proton exchange membrane fuel cell.

[0037] The fuel cell 200 has a cathode and an anode. The cathode is supplied with oxidizing gas by the gas supply system of any embodiment of the present application, and the anode is supplied with reducing gas by the hydrogen supply and circulation unit 210.

[0038] The hydrogen supply and circulation unit 210 can be, for example, an electrolyzer. During periods of low electricity consumption or when electricity is surplus, the electrolyzer is used to decompose water into hydrogen and oxygen, and the hydrogen is stored. This process can convert electrical energy into chemical energy, thereby achieving energy storage. During periods of peak electricity consumption or when electricity is insufficient, the stored hydrogen is converted into electrical energy through the fuel cell 200 and then connected to the public power grid. This process converts chemical energy into electrical energy to meet electricity demand.

[0039] The oxygen supply module 10 includes an oxygen source 11 for providing oxygen.

[0040] It should be noted that the specific type of the oxygen source 11 is not limited. In some embodiments, the oxygen provided by the oxygen source 11 is high-purity oxygen, and the source of high-purity oxygen is relatively wide and easy to obtain. In other embodiments, the oxygen provided by the oxygen source 11 can also be ordinary oxygen, but its impurity content needs to be controlled to meet the intake quality requirements of the fuel cell 200.

[0041] The gas mixing module 30 is connected to the oxygen supply module 10 and the air supply module 20 respectively, and is used to mix oxygen and air to obtain a mixed gas; the gas mixing module 30 is also connected to the cathode of the fuel cell 200 to supply the mixed gas to the fuel cell 200.

[0042] It is understandable that, at the cathode of the fuel cell 200, oxygen is mainly used as an oxidizing gas to participate in the reaction, and the oxygen and air are mixed by the gas mixing module 30, and the oxygen and air can be evenly mixed, so that the oxygen concentration in the mixed gas can be in a relatively stable state. When the fuel cell 200 is reacting, the oxidizing gas can be continuously and stably supplied, thereby helping to improve the stability and efficiency of the fuel cell 200 reaction.

[0043] The oxygen concentration in the mixed gas is adjustable. In this way, the oxygen concentration in the mixed gas can be adjusted according to actual needs, which is more convenient when used.

[0044] The gas supply system of the fuel cell of the embodiment of the present application uses a mixed gas of oxygen and air to supply gas to the cathode of the fuel cell 200. When the fuel cell 200 is applied to high altitude areas, even if the air in the high altitude area is relatively thin, the oxygen supply to the cathode of the fuel cell 200 can be ensured by the oxygen source 11, that is, the gas supply system does not need to rely too much on the air supply module 20 to provide oxygen, which is conducive to controlling the load of the air supply module 20 within a relatively reasonable range, thereby facilitating the improvement of the system efficiency and reliability of the fuel cell 200, and thus facilitating the application of the fuel cell 200 in high altitude areas. In addition, by mixing oxygen and air through the gas mixing module 30, oxygen and air can be evenly mixed, so that the oxygen concentration in the mixed gas can be in a relatively stable state, which is conducive to the stability of the operation of the fuel cell 200; the oxygen concentration in the mixed gas is adjustable, so that the oxygen concentration in the mixed gas can be adjusted according to actual needs, thereby facilitating the optimization of the performance of the fuel cell 200.

[0045] In addition, the oxygen concentration in the mixed gas is higher than the oxygen concentration in the air. Under the condition that the gas supply volume remains unchanged, the gas supply system of the embodiment of the present application is used to supply the mixed gas to the fuel cell 200, which is beneficial to increase the oxygen supply to the cathode of the fuel cell 200, thereby helping to improve the performance of the fuel cell 200 and enhance the power generation capacity of the fuel cell 200.

[0046] It can be understood that the fuel cell 200 of the embodiment of the present application can be coupled with photovoltaic power generation. When the light is strong during the day, photovoltaic power generation is used, and at night, the fuel cell 200 is used to generate electricity. In this way, a continuous and stable supply of electricity can be achieved.

[0047] The air in the mixed gas helps to regulate the temperature of the fuel cell 200 . The air can be used to take away a portion of the heat, thereby helping to reduce the probability of overheating of the fuel cell 200 .

[0048] The gas supply system of the embodiment of the present application can achieve high oxygen concentration supply to the cathode of the fuel cell 200. The adjustment range of the oxygen concentration in the mixed gas is relatively large, and precise adjustment and control of the oxygen concentration can be achieved in high-altitude areas.

[0049] For some examples, see Figure 1 The oxygen supply module 10 further includes a decompression unit 12 , which is disposed downstream of the oxygen source 11 and is used to control the supply pressure of the oxygen source 11 .

[0050] There is no limitation on the way in which the decompression unit 12 regulates the supply pressure of the oxygen source 11. For example, the decompression unit 12 can be automatically adjusted according to the pressure requirement of the mixed gas.

[0051] In this embodiment, the supply pressure of the oxygen source 11 is controlled by the decompression unit 12, which is beneficial to regulating the pressure of the mixed gas within a suitable range and improving the safety and stability of the gas supply system.

[0052] For some examples, see Figure 1 The oxygen supply module 10 further includes a first flow control unit 13 , which is disposed downstream of the oxygen source 11 and is used to control the supply flow of the oxygen source 11 .

[0053] The specific type of the first flow control unit 13 is not limited. For example, the first flow control unit 13 can be a throttle valve, a speed regulating valve, etc.

[0054] Exemplarily, the first flow control unit 13 can be automatically adjusted according to the demand for oxygen by the gas supply system.

[0055] In this embodiment, the oxygen supply module 10 can provide oxygen of a suitable flow rate according to the amount of oxygen required by the rear end, so as to accurately control the mixing ratio of oxygen and air to meet the performance requirements under different operating conditions. In addition, it can ensure that a stable gas flow rate is provided under different load conditions to maintain the consistency of the performance of the fuel cell 200.

[0056] The oxygen supply module 10 can quickly respond to load changes and adjust the oxygen supply in time to reduce performance fluctuations of the fuel cell 200 .

[0057] For some examples, see Figure 1 The air supply module 20 includes an air compressor 21 and a second flow control unit 22. The inlet of the air compressor 21 is connected to the atmosphere, and the outlet is connected to the gas mixing module 30 through the second flow control unit 22. The second flow control unit 22 is used to control the supply flow of air.

[0058] The specific type of the air compressor 21 can be matched according to the actual flow demand.

[0059] The specific type of the second flow control unit 22 is not limited. For example, the second flow control unit 22 can be a throttle valve, a speed regulating valve, etc.

[0060] Exemplarily, the second flow control unit 22 can be automatically adjusted according to the air demand of the air supply system.

[0061] The second flow control unit 22 can control the supply flow of air, and in some embodiments, the second flow control unit 22 can also display the current air flow.

[0062] In this embodiment, the air supply module 20 can supply air based on the actual air demand at the rear end, which is beneficial to the precise control and regulation of the air supply.

[0063] For some examples, see Figure 1 The gas mixing module 30 includes a gas mixing unit 31 and a gas storage unit 32 which are interconnected. The gas mixing unit 31 is respectively connected to the oxygen supply module 10 and the air supply module 20, and can mix oxygen and air to obtain a mixed gas; the gas storage unit 32 is used to store the mixed gas and can supply the mixed gas to the fuel cell 200.

[0064] There is no limitation on the specific type of the gas mixing unit 31. For example, the gas mixing unit 31 may be a pipeline mixer, which performs preliminary mixing of oxygen and air. The form and size of the pipeline mixer may be set according to the actual flow rate of the mixed gas.

[0065] The pipeline mixer can be a static mixer or a dynamic mixer, and common forms include static baffle type, orifice plate type, three-way mixer, etc.

[0066] The specific type of the gas storage unit 32 is not limited. For example, the gas storage unit 32 may be a gas storage tank.

[0067] The gas storage unit 32 is located downstream of the gas mixing unit 31. The mixed gas can be statically mixed inside the gas storage unit 32, so that the mixture of oxygen and air is more uniform, thereby facilitating the precise control of the oxygen concentration in the mixed gas.

[0068] It is understandable that the mixed gas is then supplied to the fuel cell 200 via the gas storage unit 32 , so that the oxygen supply to the fuel cell 200 is more stable, which is beneficial to improving the performance of the fuel cell 200 .

[0069] For some examples, see Figure 1 The gas mixing module 30 also includes a circulation pipeline 33 and a driving member 34. The two ends of the circulation pipeline 33 are respectively connected to two different positions of the gas storage unit 32. The driving member 34 is arranged on the circulation pipeline 33 and can drive the mixed gas to flow from one end of the circulation pipeline 33 to the other end.

[0070] Specifically, one end of the circulation pipeline 33 is connected to the top of the gas storage unit 32, and the other end is connected to the bottom of the gas storage unit 32. In this way, most of the mixed gas in the gas storage unit 32 can be migrated through the circulation pipeline 33, thereby maximizing the uniformity of the mixed gas.

[0071] The specific type of the driving member 34 is not limited. For example, the driving member 34 may be a gas circulation pump.

[0072] The driving member 34 is helpful to improve the uniformity of the mixed gas in the gas storage unit 32. Specifically, the driving member 34 can realize uniform mixing of the mixed gas by forced circulation, thereby further improving the stability of the cathode oxygen supply of the fuel cell 200.

[0073] For some examples, see Figure 1 The gas circulation module further includes an oxygen concentration monitoring component 35 , which is used to monitor the oxygen concentration of the mixed gas in the gas storage unit 32 .

[0074] The installation position of the oxygen concentration monitoring element 35 is not limited.

[0075] In some embodiments, the oxygen concentration monitoring component 35 is disposed on the communication path between the gas storage unit 32 and the cathode inlet of the fuel cell 200 , so that the oxygen concentration monitoring component 35 can more accurately obtain the oxygen concentration in the mixed gas supplied by the gas supply system to the fuel cell 200 .

[0076] In other embodiments, the oxygen concentration monitoring component 35 is disposed on the gas storage unit 32 , so as to monitor the oxygen concentration in the mixed gas in the gas storage unit 32 .

[0077] The oxygen concentration monitoring component 35 can be interlocked with the driving component 34 for control. The uniformity of the mixed gas in the gas storage unit 32 can be evaluated by the oxygen concentration monitoring component 35. When the oxygen concentration remains stable for a certain period of time, it means that the uniformity of the mixed gas is good and the driving component 34 does not need to be turned on. When the oxygen concentration is unstable, it means that the uniformity of the mixed gas needs to be improved. At this time, the driving component 34 is controlled to be turned on to circulate the mixed gas in the gas storage unit 32.

[0078] In addition, the oxygen concentration monitoring component 35 can also be used to feedback and adjust the flow rate of oxygen and / or air, thereby achieving automatic adjustment of the first flow control unit 13 and / or the second flow control unit 22.

[0079] There is no limitation on the specific number of oxygen concentration monitoring components 35 . For example, the number of oxygen concentration monitoring components 35 is not less than two, which is helpful to avoid the fuel cell 200 being affected by the measurement deviation of a single oxygen concentration monitoring component 35 .

[0080] For some examples, see Figure 1 The gas circulation module also includes a pressure relief pipeline 36 and a pressure relief valve 37 . One end of the pressure relief pipeline 36 is connected to the gas storage unit 32 , and the other end is connected to the outside of the gas storage unit 32 . The pressure relief valve 37 is arranged on the pressure relief pipeline 36 .

[0081] The specific type of the pressure relief valve 37 is not limited.

[0082] In some embodiments, the pressure relief valve 37 may be a solenoid valve, which is opened or closed by an electrical signal. Thus, the control method of the pressure relief valve 37 is more convenient.

[0083] In other embodiments, the pressure relief valve 37 can be a safety valve. When the pressure inside the gas storage unit 32 reaches a set value, the mixed gas can automatically open the valve flap of the safety valve to achieve pressure relief; when the pressure inside the gas storage unit 32 is lower than the set value, the valve flap of the safety valve can automatically close.

[0084] In this embodiment, it is convenient to control the pressure of the mixed gas inside the gas storage unit 32 so that the pressure of the mixed gas can meet the intake pressure requirement of the fuel cell 200 and avoid the influence of excessive pressure on the fuel cell 200.

[0085] For some examples, see Figure 1 The gas circulation module further includes a pressure monitoring component 38 , which is used to monitor the pressure of the mixed gas in the gas storage unit 32 .

[0086] The setting position of the pressure monitoring component 38 is not limited. Exemplarily, the pressure monitoring component 38 is also arranged on the pressure relief pipeline 36.

[0087] By providing the pressure monitoring component 38 , the pressure inside the gas storage unit 32 can be monitored in real time, thereby facilitating the control of the pressure relief valve 37 .

[0088] In addition, the pressure monitoring component 38 can also provide a feedback signal, and the flow rate of oxygen and air can be controlled by the feedback signal.

[0089] The communication position of the outlet of the pressure relief pipe 36 is not limited.

[0090] In some embodiments, the outlet of the pressure relief pipe 36 is connected to the atmosphere, so that the excess mixed gas inside the gas storage unit 32 is directly discharged into the atmosphere.

[0091] In some other embodiments, please refer to Figure 1 The air supply module 20 includes an air compressor 21 , an inlet of the air compressor 21 is connected to the atmosphere, an outlet of the air compressor 21 is connected to the gas mixing unit 31 , and the other end of the pressure relief line 36 is connected to the inlet of the air compressor 21 .

[0092] In this way, the excess mixed gas in the gas storage unit 32 can be returned to the gas supply system again, thereby achieving maximum utilization of oxygen, which is beneficial to reducing the use cost of the fuel cell 200.

[0093] In some embodiments, the fuel cell 200 includes a tail gas discharge unit 220, which is mainly used to discharge a mixed gas consisting of unreacted oxygen and air and a small amount of hydrogen.

[0094] In some embodiments, the fuel cell 200 further includes an auxiliary unit, which includes a control system suitable for controlling different oxygen concentrations and overall control of the fuel cell power generation system. At the same time, the auxiliary unit also includes a cooling unit, a UPS unit, a water heat management unit, an electric energy output adjustment unit, etc., which are necessary for the fuel cell power generation system.

[0095] The control system mainly relies on fast-response control algorithms, such as PID-fuzzy control or DRL-based control strategies, to quickly adapt to load changes and oxygen concentration changes. The stability of the fuel cell power generation system is improved through multi-model switching or adaptive control to ensure stability under parameter changes and external disturbances.

[0096] The control system is an integrated real-time monitoring system, which monitors key parameters such as oxygen concentration and pressure of the gas storage unit 32 in real time, and has a fault diagnosis function, which can detect and handle corresponding faults in time.

[0097] The gas supply system of the fuel cell 200 provided in the embodiment of the present application is further described below in conjunction with two specific embodiments.

[0098] First embodiment:

[0099] The existing plateau environment fixed power station adopts hydrogen-oxygen proton exchange membrane fuel cell system. In order to improve its power generation performance, oxygen is supplied by container grid steel cylinders, and hydrogen is supplied by container grid steel cylinders. The system is supplied by mixing high-purity oxygen and air. The oxygen concentration is controlled to be higher than the oxygen concentration in the air, and the oxygen concentration value varies around 25%. The oxygen supply pressure is not less than 0.2MPa, and the oxygen flow rate is controlled to 20Nm 3 / h. Air is supplied by air compressor 21, with an air flow rate of about 250Nm3 / h, which is adjusted and controlled according to actual needs. Hydrogen is supplied by high-purity hydrogen, with a supply volume of about 40Nm 3 / h, the fuel cell fixed power supply can achieve stable output of electrical energy.

[0100] Second embodiment:

[0101] The existing fixed emergency power station in plateau environment adopts hydrogen-oxygen proton exchange membrane fuel cell system, that is, the stack used is hydrogen-air fuel cell stack, oxygen is supplied by container grid cylinders, hydrogen is supplied by container grid cylinders, and the system is provided with high-purity oxygen for cathode gas supply. The oxygen supply pressure is not less than 0.2MPa, and the oxygen flow rate is controlled to 40Nm 3 / h, air supply 50Nm 3 / h. Hydrogen is supplied by high-purity hydrogen, with a supply volume of about 100Nm 3 / h, and can be adjusted and controlled according to actual power needs to achieve stable power output.

[0102] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A fuel cell gas supply system, characterized in that: include: An oxygen supply module, comprising an oxygen source, wherein the oxygen source is used to provide oxygen; An air supply module, for providing air; a gas mixing module, connected to the oxygen supply module and the air supply module respectively, the gas mixing module is used to mix the oxygen and the air to obtain a mixed gas, and the oxygen concentration in the mixed gas is adjustable; The gas mixing module is also in communication with the cathode of the fuel cell for supplying the mixed gas to the fuel cell.

2. The fuel cell gas supply system according to claim 1, characterized in that: The oxygen supply module further comprises a decompression unit, which is disposed downstream of the oxygen source and is used to control the supply pressure of the oxygen source; and / or, The oxygen supply module further includes a first flow control unit, which is disposed downstream of the oxygen source and is used to control the supply flow of the oxygen source.

3. The fuel cell gas supply system according to claim 1, characterized in that: The air supply module includes an air compressor and a second flow control unit. The inlet of the air compressor is connected to the atmosphere, and the outlet is connected to the gas mixing module through the second flow control unit. The second flow control unit is used to control the supply flow of the air.

4. The fuel cell gas supply system according to claim 1, characterized in that: The gas mixing module includes a gas mixing unit and a gas storage unit which are interconnected. The gas mixing unit is respectively connected to the oxygen supply module and the air supply module and can mix the oxygen and the air to obtain the mixed gas. The gas storage unit is used to store the mixed gas and can supply the mixed gas to the fuel cell.

5. The fuel cell gas supply system according to claim 4, characterized in that: The gas mixing module also includes a circulation pipeline and a driving member, wherein the two ends of the circulation pipeline are respectively connected to two different positions of the gas storage unit, and the driving member is arranged on the circulation pipeline and can drive the mixed gas to flow from one end of the circulation pipeline to the other end.

6. The fuel cell gas supply system according to claim 4, characterized in that: The gas circulation module further includes an oxygen concentration monitoring component, which is used to monitor the oxygen concentration of the mixed gas in the gas storage unit.

7. The fuel cell gas supply system according to claim 4, characterized in that: The gas circulation module further includes a pressure relief pipeline and a pressure relief valve. One end of the pressure relief pipeline is connected to the gas storage unit, and the other end is connected to the outside of the gas storage unit. The pressure relief valve is arranged on the pressure relief pipeline.

8. The fuel cell gas supply system according to claim 7, characterized in that: The gas circulation module further includes a pressure monitoring component, which is used to monitor the pressure of the mixed gas in the gas storage unit.

9. The fuel cell gas supply system according to claim 7, characterized in that: The air supply module comprises an air compressor, an inlet of the air compressor is communicated with the atmosphere, an outlet of the air compressor is communicated with the gas mixing unit, and the other end of the pressure relief pipeline is communicated with the inlet of the air compressor.

10. The fuel cell gas supply system according to claim 1, characterized in that: The oxygen provided by the oxygen source is high-purity oxygen; and / or, The fuel cell is a proton exchange membrane fuel cell.

Images