Heat exchange system, circulation system, and control method and related equipment of circulation system

Abstract

This application relates to the field of fuel cells, specifically to a heat exchange system, a circulation system, and a control method and related equipment for the circulation system. The heat exchange system includes a main pipeline whose input end is connected to a fuel delivery system, and whose output end is connected to the fuel input end of the fuel circulation system. The input end of the heat exchanger's heat exchange pipe is connected to the output end of a tailpipe, through which exhaust gas is discharged. The tailpipe's exhaust gas has a high temperature, which heats the fuel in the heat exchanger before it enters the fuel circulation system. The heated fuel further heats the fuel circulation system during its circulation, thus preventing water accumulation and icing on components and improving the fuel cell's system operating efficiency and low-temperature reliability.

Description

Technical Field

[0001] This application relates to the field of fuel cells, specifically to a heat exchange system, a circulation system, and a control method and related equipment for the circulation system. Background Technology

[0002] Fuel cells are devices that directly convert the chemical energy of fuel and oxidant into electrical energy through electrode reactions. As a highly efficient and low-pollution clean energy source, they can be widely used in the automotive industry, power generation, shipbuilding, and other fields. However, the fuel cycle system of fuel cells is prone to water accumulation and icing on components at low temperatures, affecting system operating efficiency. Therefore, there is an urgent need for a technical solution to improve the system operating efficiency of fuel cells. Summary of the Invention

[0003] In view of this, the embodiments of this application aim to provide a heat exchange system, a circulation system, and a control method and related equipment for the circulation system, so as to solve the problem that the fuel circulation system of fuel cells in the prior art is prone to water accumulation and icing of components at low temperatures, which affects the system operating efficiency.

[0004] This application provides a heat exchange system, including: heat exchange equipment;

[0005] The heat exchange equipment includes a main pipeline and heat exchange pipelines;

[0006] The input end of the main pipeline is connected to the fuel delivery equipment, and the output end of the main pipeline is connected to the fuel input end of the fuel circulation system; the input end of the heat exchange pipeline is connected to the output end of the fuel cell exhaust pipeline, and the exhaust gas in the exhaust pipeline is discharged through the output end of the heat exchange pipeline.

[0007] The main pipeline exchanges heat with the heat exchange pipeline to heat the fuel flowing through the main pipeline.

[0008] Furthermore, the heat exchange system described above also includes: a bypass pipeline and a bypass valve;

[0009] The bypass valve is installed on the bypass pipeline;

[0010] The input end of the bypass pipe is connected to the output end of the air compression device in the air circulation system, and the output end of the bypass pipe is connected to the input end of the heat exchange pipe.

[0011] Another aspect of this application provides a circulation system for a fuel cell, including a fuel circulation system, an air circulation system, and a heat exchange system as described in any one of the above.

[0012] The fuel circulation system and the air circulation system are respectively connected to the heat exchange system;

[0013] The fuel circulation system and the air circulation system are also connected to the fuel cell stack.

[0014] This application also provides a control method for a circulating system, applied to the circulating system of the fuel cell described in any of the above claims, the method comprising:

[0015] Obtain the start signal of the fuel cell;

[0016] In response to the start-up signal, the fuel cell stack and the fuel cycle system are heated;

[0017] Check whether the fuel cell stack and the fuel cycle system have met the cold start conditions;

[0018] If the fuel cell stack and the fuel cycle system meet the cold start conditions, then the cold start is considered complete.

[0019] Furthermore, in the control method of the above-described circulation system, heating the fuel cell stack and the fuel circulation system includes:

[0020] The bypass valve in the heat exchange system is opened, the air compressor in the air circulation system is started, the exhaust valve in the fuel circulation system is opened at a preset frequency, and the fuel control valve in the fuel circulation system is opened to heat the fuel stack and the fuel circulation system.

[0021] Furthermore, in the control method for the above-described circulation system, before controlling the fuel control valve in the fuel circulation system to open, the method further includes:

[0022] Detect the temperature of the heat exchanger;

[0023] If the temperature of the heat exchanger reaches the first set temperature, the fuel control valve is turned on.

[0024] Furthermore, in the control method of the above-described circulation system, detecting whether the fuel cell stack and the fuel circulation system have reached the cold start conditions includes:

[0025] Check whether the fuel cell stack and the fuel cycle system have both reached the corresponding set temperature;

[0026] If both the fuel cell stack and the fuel cycle system reach their respective set temperatures, it indicates that both the fuel cell stack and the fuel cycle system have met the cold start conditions.

[0027] Furthermore, in the control method of the above-described circulation system, detecting whether the fuel circulation system has reached the corresponding set temperature includes:

[0028] The system detects whether the exhaust valve in the fuel circulation system has reached a second set temperature, and detects whether the pressure regulating valve in the fuel circulation system has reached a third set temperature.

[0029] If the exhaust valve reaches the second set temperature, and the pressure regulating valve reaches the third set temperature, then the fuel circulation system has reached the corresponding set temperature.

[0030] Furthermore, in the control method of the above-described circulation system, if the fuel cell stack and the fuel circulation system meet the cold start conditions, after determining that the cold start is complete, the method further includes:

[0031] Control the bypass valve to shut off.

[0032] Another aspect of this application provides a control device for a circulation system, applied to the circulation system of the fuel cell described in any of the above claims, the device comprising:

[0033] The acquisition module is used to acquire the start signal of the fuel cell;

[0034] A heating module is used to heat the fuel cell stack and the fuel cycle system in response to the start-up signal;

[0035] The detection module is used to detect whether the fuel cell stack and the fuel cycle system have reached the cold start conditions;

[0036] The determination module is used to determine that the cold start is complete if the fuel cell stack and the fuel cycle system meet the cold start conditions.

[0037] Another aspect of this application provides a control device, including a memory, a processor, and a computer program stored in the memory and executed by the processor, wherein the processor executes the computer program to implement the steps of the control method for the fuel cell air circulation system as described in any of the preceding claims.

[0038] Another aspect of this application provides a fuel cell, including a fuel cell stack, a fuel cell circulation system as described in any one of the above claims, and a control device as described in any one of the above claims;

[0039] The control device is electrically connected to the circulation system of the fuel cell and the fuel cell stack;

[0040] The circulation system of the fuel cell is connected to the fuel cell stack.

[0041] Another aspect of this application provides a mechanical device including any of the fuel cells described above.

[0042] The heat exchange system, circulation system, and control method and related equipment provided in this application include a heat exchange device. The input end of the main pipeline of the heat exchange device is connected to the fuel delivery equipment, and the output end is connected to the fuel input end of the fuel circulation system. The input end of the heat exchange pipeline of the heat exchange device is connected to the output end of the tail gas pipeline, and the tail gas in the tail gas pipeline is discharged through the output end of the heat exchange pipeline. The tail gas output from the tail gas pipeline has a high temperature. Before the fuel enters the fuel circulation system, the high-temperature tail gas can heat the fuel in the heat exchange device. The heated fuel circulates in the fuel circulation system and further heats the fuel circulation system, thereby preventing water accumulation and icing of components in the fuel circulation system and improving the system operating efficiency and low-temperature operation reliability of the fuel cell. Attached Figure Description

[0043] Figure 1 The diagram shown is a structural schematic of a heat exchange system provided in an embodiment of this application.

[0044] Figure 2 The diagram shown is a structural schematic of a heat exchange system provided in another embodiment of this application.

[0045] Figure 3 The diagram shown is a schematic diagram of the circulation system of a fuel cell provided in an embodiment of this application.

[0046] Figure 4 The diagram shown is a schematic diagram of the circulation system of a fuel cell provided in another embodiment of this application.

[0047] Figure 5 The diagram shown is a flowchart illustrating a control method for a cyclic system according to an embodiment of this application.

[0048] Figure 6 The diagram shown is a flowchart illustrating a process for detecting whether the fuel cell stack and fuel cycle system have met the cold start conditions, according to an embodiment of this application.

[0049] Figure 7 The diagram shown is a flowchart illustrating a process for detecting whether a fuel cycle system has reached a set temperature, according to an embodiment of this application.

[0050] Figure 8 The diagram shown is a schematic diagram of the control device for a circulation system provided in an embodiment of this application.

[0051] Figure 9 The diagram shown is a structural schematic of a control device provided in an embodiment of this application.

[0052] Figure 10 The diagram shown is a structural schematic of a fuel cell provided in an embodiment of this application. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] In the power generation process of a fuel cell, hydrogen is typically introduced into the positive electrode of the fuel cell stack, while air is introduced into the negative electrode. The hydrogen and oxygen in the air undergo a chemical reaction within the stack, converting chemical energy into electrical energy. As a highly efficient and low-pollution clean energy power generation system, fuel cells can be widely used in the automotive industry, power generation, shipbuilding industry, and other fields.

[0055] However, fuel cell fuel cycle systems are prone to water accumulation and icing when operating at low temperatures. Furthermore, the newly added fuel to the fuel cycle system is at a low temperature, while the fuel already in the fuel cycle participates in the reactions within the fuel stack, resulting in fuel that is not only hot but also highly humid. When this hot fuel encounters the newly added cold fuel, condensation and icing occur, exacerbating the water accumulation and icing problem in the fuel cycle system. Water accumulation and icing in the fuel cycle system of a fuel cell increases the risk of flooding of the fuel stack and component failure, ultimately impacting system efficiency.

[0056] Based on this, this application provides a heat exchange system, a circulation system, a control method for the circulation system, and related equipment to solve the problem in the prior art where water accumulation and icing of components in the fuel circulation system of a fuel cell are prone to occur at low temperatures, affecting the system's operating efficiency.

[0057] Figure 1 The diagram shown is a structural schematic of a heat exchange system provided in an embodiment of this application. Figure 1 As shown, the heat exchange system of this embodiment includes a heat exchange device 10, which includes a main pipeline 101 and a heat exchange pipeline 102.

[0058] The input end of the main pipeline 101 is connected to the fuel delivery device Q, and the output end of the main pipeline 101 is connected to the fuel input end of the fuel circulation system 20 in the fuel cell, so as to deliver the fuel output by the fuel delivery device Q to the fuel circulation system 20.

[0059] The input end of the heat exchanger 102 is connected to the output end of the fuel cell exhaust pipe 21, and the exhaust gas in the exhaust pipe is discharged through the output end of the heat exchanger 102. For example, the output end of the heat exchanger 102 can be directly connected to the atmosphere, so that the exhaust gas in the exhaust pipe 21 is discharged into the atmosphere through the output end of the heat exchanger 102.

[0060] Figure 1The direction of the middle arrow indicates the direction of gas flow, such as... Figure 1 As shown, the exhaust gas in the fuel cell's tailpipe 21 includes the exhaust gas discharged from the air circulation system 22 and the exhaust gas discharged from the fuel circulation system 20, and its temperature is relatively high. For example, the exhaust gas of commonly used hydrogen fuel cells can reach about 80°C. The fuel in the main pipeline 101 and the high-temperature exhaust gas in the heat exchange pipeline 102 undergo sufficient heat exchange, thereby heating the fuel flowing through the main pipeline 101. The heated fuel circulates in the fuel circulation system, further heating the fuel circulation system, thus alleviating the phenomenon of water accumulation and icing on the components of the fuel circulation system, and improving the system operating efficiency and low-temperature operating reliability of the fuel cell.

[0061] Moreover, when the high-temperature fuel in the fuel cycle system meets the newly input fuel, the temperature of the fuel flowing through the main pipeline 101 is raised after heating, so there will be no condensation or freezing. This further alleviates the phenomenon of water accumulation and freezing on the components of the fuel cycle system and improves the system operating efficiency of the fuel cell.

[0062] For example, the heat exchange device 10 can be a plate heat exchanger, a finned heat exchanger, or a shell heat exchanger, etc., and this embodiment does not limit it.

[0063] In another alternative embodiment, such as Figure 2 As shown, the heat exchange system in the above embodiment also includes a bypass pipe 11 and a bypass valve 12. The bypass valve 12 is disposed on the bypass pipe 11 and is used to control the opening and closing of the bypass pipe 11. Specifically, when the bypass valve 12 is closed, the bypass pipe 11 is closed accordingly, and when the bypass valve 12 is open, the bypass pipe 11 is open accordingly.

[0064] The input end of the bypass pipe 11 is connected to the output end of the air compression device 221 of the air circulation system 22 in the fuel cell, and the output end of the bypass pipe 11 is connected to the input end of the heat exchange pipe 102. In the embodiments of this application, in order to save piping and reduce costs, such as Figure 2 As shown, since the output end of the tailpipe 21 is connected to the input end of the heat exchange pipe 102, the output end of the bypass pipe 11 can be directly connected to the tailpipe 21 so that the bypass pipe 11 can send the gas output by the air compressor 221 into the heat exchange pipe 102 through the tailpipe 21.

[0065] In a fuel cell, the function of the air compressor is to compress air to a certain pressure so that the air pressure input to the fuel cell stack meets the stack's requirements. The air output from the air compressor is often at a high temperature due to compression. By configuring the bypass pipe 11 in this way, the high-temperature air after being compressed by the air compressor 221 can be delivered to the heat exchange pipe 102.

[0066] Currently, before the fuel cell is officially started and operated, the air compressor 221 is run first to dilute the gas concentration in the exhaust pipeline with the air output from the air compressor 221. At low temperatures, when the fuel cell is cold-started, this process can be used to start the air compressor 221 and control the bypass valve 12 to open. Figure 2 The direction of the middle arrow indicates the direction of gas flow, such as... Figure 2 As shown, the bypass line 11 delivers the high-temperature air output from the air compressor 221 to the heat exchange line 102 via the tailpipe 21, where it exchanges heat with the fuel flowing through the main line 101, raising the fuel temperature. The heated fuel then enters the fuel circulation system 20, circulating between the fuel circulation system 20 and the fuel cell stack, heating the stack and the pipes, valves, and sensors within the fuel circulation system 20. Currently, hydrogen is generally used as the fuel for fuel cells. When the high-temperature hydrogen enters the stack, a hydrogen pump effect occurs within the stack, causing it to heat up further. When the temperatures of the stack and the fuel circulation system 20 reach certain values, the cold start is complete. Afterward, the bypass valve 12 is closed, allowing the fuel cell to operate normally and generate electricity.

[0067] In the above embodiments, a bypass pipe 11 is provided between the output end of the air compressor 221 and the cooling pipe 102. When the fuel cell is cold-started, the bypass valve 12 on the bypass pipe 11 is opened so that the high-temperature air output by the air compressor 221 heats the fuel. During the circulation process, the fuel heats the fuel stack and the fuel circulation system 20 so that the fuel stack and the fuel circulation system 20 can quickly reach the cold-start conditions, effectively improving the cold-start speed.

[0068] In another alternative embodiment, such as Figure 3 As shown, an embodiment of this application also provides a fuel cell circulation system, including a fuel circulation system 20, an air circulation system 22, and a heat exchange system 23 as described in the above embodiments. The fuel circulation system 20 and the air circulation system 22 are respectively connected to the heat exchange system 23, and are also respectively connected to the fuel cell stack. The fuel cell circulation system can heat the fuel through the heat exchange system 23, effectively mitigating the phenomenon of water accumulation and icing on components of the fuel circulation system 20, and improving the system operating efficiency of the fuel cell.

[0069] In another alternative embodiment, such as Figure 4 As shown, the fuel circulation system 20 of the above embodiment includes a fuel circulation pipeline 201, an exhaust pipeline 206, a safety pipeline 207, and a fuel control valve 202, a pressure regulating valve 208, a gas-water separator 203, an exhaust valve 204, and a safety valve 205 disposed on the fuel circulation pipeline.

[0070] like Figure 4 As shown, the fuel circulation pipeline 201 includes two parts: a fuel delivery section 2011 and a fuel circulation section 2012.

[0071] The input end of the fuel delivery section 2011 is connected to the output end of the main pipeline 101 in the heat exchanger 10, and the output end of the fuel delivery section 2011 is connected to the fuel input end of the fuel circulation section 2012. The fuel delivery section 2011 is used to obtain the fuel delivered by the main pipeline 101 and deliver the fuel to the fuel circulation section 2012. A fuel control valve 202 is provided in the fuel delivery section 2011, and the fuel delivery amount is controlled by controlling the opening and closing of the fuel control valve 202. For example, the fuel control valve 202 can be a proportional valve or a shut-off valve, which is not limited in this embodiment.

[0072] The fuel input end of the fuel cycle section 2012 is used to obtain fuel from the fuel delivery section 2011. The fuel output end of the fuel cycle section 2012 is connected to the negative fuel input port of the fuel cell stack, and is used to input fuel into the fuel cell stack to participate in the internal chemical reaction, so as to convert chemical energy into electrical energy. The fuel recovery end of the fuel cycle section 2012 is connected to the negative fuel output port of the fuel cell stack, and is used to recover fuel that has not participated in the chemical reaction in the fuel cell stack from the negative fuel output port of the fuel cell stack. The recovered fuel will be combined with the new fuel flowing in from the fuel input end of the fuel cycle section 2012, and then sent back into the fuel cell stack through the negative fuel input port.

[0073] The pressure regulating valve 208 is located in the fuel circulation section 2012, specifically at the junction of the recovered fuel and the new fuel flowing in from the fuel input end of the fuel circulation section 2012. The pressure regulating valve 208 adjusts the pressure of the recovered fuel and the new fuel to ensure that the fuel entering through the negative electrode fuel input port of the fuel cell meets the pressure requirements of the fuel cell. For example, if hydrogen is used as the fuel for the fuel cell, the pressure regulating valve 208 includes a hydrogen injection valve to reduce the hydrogen pressure, ensuring that the hydrogen pressure meets the pressure requirements of the fuel cell and guaranteeing the power generation efficiency of the fuel cell.

[0074] The gas-water separator 203 is also located in the fuel circulation section 2012, specifically at the fuel recovery end of the fuel circulation section 2012. Since the recovered fuel contains water vapor and has a high temperature, after being output from the negative fuel outlet of the fuel cell stack, it can first undergo preliminary gas-water separation through the gas-water separator 203 to remove some of the water vapor. Then, the recovered fuel that has undergone preliminary gas-water separation is transported back to the fuel circulation section 2012, where it merges with the new fuel flowing in from the fuel input end of the fuel circulation section 2012. After pressure regulation by the pressure regulating valve 208, it is sent into the fuel cell stack through the negative fuel input end.

[0075] An exhaust valve 204 is installed on the exhaust pipe 206 to control the opening and closing of the exhaust pipe 206. The exhaust pipe 206 can be connected to the gas-water separator 203, which can discharge the separated water vapor through the exhaust pipe 206. Furthermore, since the air contains a large amount of nitrogen, nitrogen in the air circulation system 22 may permeate into the fuel circulation system 20. The exhaust pipe 206 in this embodiment can discharge the nitrogen that has permeated into the fuel circulation system 20. During the fuel cell reactor reaction, the exhaust valve 204 can be opened at a certain frequency to discharge nitrogen and water vapor.

[0076] Furthermore, such as Figure 4 As shown, the circulation system in this embodiment also includes a tailpipe 21 for discharging exhaust gas. The exhaust pipe 206 can be connected to the tailpipe 21, and the gas in the exhaust pipe 206 can be discharged through the tailpipe 21.

[0077] In addition, safety valve 205 is installed on safety line 207. For example... Figure 4 As shown, when the safety valve 205 is open, it connects the fuel circulation system 20 to the tailpipe 21. When the pressure of the fuel circulation system 20 exceeds the specified value, the safety valve 205 opens, discharging a portion of the fuel in the fuel circulation system 20 into the tailpipe 21, ensuring that the pressure of the fuel circulation system 20 does not exceed the specified value, thereby preventing accidents caused by excessive pressure in the fuel circulation system 20.

[0078] like Figure 4 As shown, the air circulation system 22 in the above embodiment includes an air compressor 221, an intercooler 222, a humidifier 223, a back pressure valve 224, and an air circulation pipeline 225.

[0079] The air inlet of the air circulation pipe 225 is connected to the output of the air compressor 221. The air compressor 221 is used to compress the air to a certain pressure, which meets the pressure requirements of the fuel cell stack, and sends the compressed air into the air circulation pipe 225 through the air inlet of the air circulation pipe 225.

[0080] An intercooler 222 is installed on the air circulation pipe 225. Since the air temperature output by the air compressor 221 is too high to meet the temperature requirements of the fuel cell stack, it is necessary to cool the air before it enters the stack. In this embodiment, an intercooler 225 is installed on the air circulation pipe 225 to cool the air output by the air compressor 221 and ensure it meets the temperature requirements of the fuel cell stack. For example, the intercooler 225 can be a water-to-air intercooler, an air-to-air intercooler, or a combination of both; this embodiment does not impose any limitations.

[0081] A humidifier 223 is also installed on the air circulation duct 225. During the reaction process, to maintain high reaction efficiency, the proton exchange membrane needs to have its moisture content kept within a certain range. Therefore, the reaction medium must carry a certain amount of water vapor into the fuel cell stack. In this embodiment, installing the humidifier 223 on the air circulation duct 225 can increase the air humidity and improve the reaction efficiency in the fuel cell stack.

[0082] A back pressure valve 224 is installed on the air circulation pipe 225, through which exhaust air in the air circulation pipe 225 is discharged into the exhaust pipe 21. In addition, the back pressure valve 224 also has the function of regulating the pressure of the air circulation pipe 225.

[0083] In the heat exchange system 23, the output end of the main pipeline 101 of the heat exchange device 10 is connected to the input end of the fuel delivery section 2011, and the input end of the main pipeline 101 is connected to the fuel delivery device Q. The input end of the heat exchange pipeline 102 is connected to the output end of the tailpipe 21, and the exhaust gas in the tailpipe 21 is discharged through the output end of the heat exchange pipeline 102. The input end of the bypass pipeline 11 is connected to the output end of the air compressor 221, and the output end of the bypass pipeline 11 is connected to the input end of the heat exchange pipeline 102.

[0084] For example, Figure 4 The direction of the middle arrow indicates the direction of gas flow, such as... Figure 4 As shown, during operation, especially during low-temperature operation, the circulation system of this embodiment can achieve the following process:

[0085] The high-temperature exhaust gas output from the air circulation pipe 225 is sent to the tailpipe 21, and the high-temperature exhaust gas output from the fuel circulation pipe 201 through the exhaust pipe 206 is also sent to the tailpipe 21, resulting in a high temperature of the exhaust gas discharged from the tailpipe 21. The high-temperature gas in the tailpipe 21 is discharged through the heat exchange pipe 102; while the fuel for the fuel cell is sent to the fuel circulation pipe 201 through the main pipe 101. The fuel flowing through the main pipe 101 and the high-temperature gas flowing through the heat exchange pipe 102 exchange heat in the heat exchange equipment 10, thereby increasing the temperature of the fuel flowing through the main pipe 101. After the high-temperature fuel enters the fuel circulation pipe 201, it heats the fuel circulation pipe 201 and the pressure regulating valve 208, gas-liquid separator 203, exhaust valve 204 and other equipment on the fuel circulation pipe 201, thereby alleviating the phenomenon of water accumulation and icing on the components of the fuel circulation system and improving the system operating efficiency of the fuel cell. Furthermore, the temperature of the newly supplied fuel increases after heat exchange, so when the newly supplied fuel and the recycled fuel are combined in the fuel circulation section 2012, there will be no condensation or freezing, which further alleviates the phenomenon of water accumulation and freezing on the components of the fuel circulation system.

[0086] For example, during a cold start, the loop system of this embodiment can implement the following process:

[0087] In low-temperature environments, when the circulation system receives a start signal, it can first control the air compressor 221 to start, control the bypass valve 12 to open, control the exhaust valve 204 to open at a preset frequency, control the fuel control valve 202 to open, and control the back pressure valve 224 to close.

[0088] The air compressor 221 compresses the air and outputs high-temperature air. The high-temperature air passes through the bypass pipe 11 and the tailpipe 21, enters the heat exchange pipe 102, and is discharged into the atmosphere through the heat exchange pipe 102.

[0089] After the fuel control valve 202 is turned on, fuel enters the main pipeline 101. The fuel flowing through the main pipeline 101 exchanges heat with the high-temperature air flowing through the heat exchanger 102 in the heat exchanger 10, and the temperature of the fuel flowing through the main pipeline 101 gradually increases. Because the exhaust valve 204 is turned on at a preset frequency, some of the fuel entering the fuel circulation pipeline 201 can be discharged through the exhaust valve 204, so that the heated fuel can continuously enter the fuel circulation pipeline 201 to heat the fuel circulation pipeline 201, as well as the pressure regulating valve 208, gas-liquid separator 203, exhaust valve 204 and other equipment on the fuel circulation pipeline 201, creating conditions for cold start. After the high-temperature fuel enters the fuel cell stack through the fuel circulation pipeline 201, it heats the fuel cell stack. Moreover, if hydrogen is used as fuel, the high-temperature hydrogen entering the fuel cell stack will generate a hydrogen pump effect, further heating the fuel cell stack. Once the temperature of the fuel cell stack and fuel cycle system 20 reaches the preset temperature, the cold start is complete. Then, the bypass valve 12 is shut off and the back pressure valve 224 is turned on.

[0090] It should be noted that the frequency of the exhaust valve 204's operation should not be too high, to avoid fuel being rapidly discharged from the fuel circulation line 201, thus failing to achieve its heating function. The frequency of the exhaust valve 204's operation should also not be too low, to avoid the heated fuel not being able to quickly enter the fuel circulation line 201, thus prolonging the cold start time. For example, the operation frequency of the exhaust valve 204 can be set to: 2 seconds on, 1 second off.

[0091] It should also be noted that the fuel discharged by the exhaust valve 204 is all heated fuel and the volume of the discharged fuel is much smaller than the volume of the high-temperature air output by the air compressor. Therefore, after the fuel discharged by the exhaust valve 204 enters the tailpipe 21, it will not affect the temperature of the high-temperature air output by the air compressor, thus ensuring the heat exchange efficiency in the heat exchange equipment 20.

[0092] In another example, under low-temperature conditions, when the circulation system receives a start-up signal, it can first control the air compressor 221 to start, control the bypass valve 12 to open, and control the back pressure valve 224 to close, without opening the fuel control valve 202. The air compressor 221 compresses the air, and the high-temperature air output enters the heat exchange pipeline 102 to preheat the heat exchanger 10. A temperature detection device can be installed on the heat exchanger 10 to monitor its temperature in real time. When the temperature of the heat exchanger 10 reaches the first set temperature, the fuel control valve 202 is then opened so that the fuel can be quickly heated after entering the main pipeline 101. Compared to the above example where the heat exchanger 10 is not preheated, this embodiment preheats the heat exchanger 10 under low-temperature conditions. When fuel is introduced into the main pipeline 10, the fuel can be quickly heated, thereby shortening the cold start time. Once the temperature of the fuel cell stack and fuel cycle system 20 reaches the preset temperature, the cold start is complete. Then, the bypass valve 12 is shut off and the back pressure valve 224 is turned on.

[0093] Currently, before the fuel cell is officially started and operated, the air compressor 221 is run first to dilute the fuel gas concentration in the tailpipe 21 with the air output from the air compressor 221. In this embodiment, this process is utilized to heat the fuel with the high-temperature air output from the air compressor 221. The fuel heats the fuel stack and fuel circulation system 20 during the circulation process, thereby effectively shortening the cold start time.

[0094] In existing technologies, a heat exchange device is installed at the front end of the fuel cycle system, and the fuel cell cooling system is used to heat it. However, in low-temperature environments, the cooling system needs to be heated by heating pipes to reach the set temperature, resulting in slow cold starts and significant energy consumption of accessories. In this embodiment, high-temperature air output from the air compressor 221, used to dilute the gas concentration in the exhaust pipe, is used to heat the fuel cycle system 20 and the fuel cell stack. This not only results in a fast cold start but also eliminates the energy consumption of accessories.

[0095] In another alternative embodiment, such as Figure 5 As shown in the embodiments of this application, a control method for a cyclic system is also provided, the steps of which are as follows:

[0096] S301, Obtain the start signal of the fuel cell.

[0097] The aforementioned start-up signal refers to the signal that starts the fuel cell, which is typically sent by the user. In this embodiment, the start-up signal of the fuel cell is acquired.

[0098] S302. In response to the start signal, heat the fuel cell stack and fuel cycle system.

[0099] In the embodiments of this application, after obtaining the start signal, the fuel cell stack and fuel system are heated according to the start signal.

[0100] For example, the air compressor is started, and the bypass valve is opened. The bypass line delivers the high-temperature air output from the air compressor to the heat exchange line, where it exchanges heat with the fuel flowing through the main line, raising the fuel temperature. The heated fuel then enters the fuel circulation system, circulating between the fuel circulation system and the fuel cell stack, heating the fuel cell stack and the pipes, valves, and sensors in the fuel circulation system. Furthermore, hydrogen is currently commonly used as fuel for fuel cells. When the high-temperature hydrogen enters the fuel cell stack, a hydrogen pump effect occurs within the stack, causing the stack to heat up further, thus raising the stack temperature even more.

[0101] S303. Check whether the fuel cell stack and fuel cycle system have met the cold start conditions.

[0102] The temperatures of the fuel cell stack and fuel cycle system are measured separately to determine whether the temperatures of the fuel cell stack and fuel cycle system meet the conditions for cold start.

[0103] Specifically, the temperature of the fuel cell stack and fuel cycle system can be obtained by temperature detection devices installed on the fuel cell stack and fuel cycle system. Then, based on the temperature measured by the temperature detection devices, it can be determined whether the temperature of the fuel cell stack and fuel cycle system has reached the conditions for cold start.

[0104] S304. If the fuel cell stack and fuel cycle system meet the cold start conditions, then the cold start is considered complete.

[0105] If testing confirms that the temperature of the fuel cell stack and fuel cycle system has reached the required temperature for cold start, then the cold start is complete. Simply close the bypass valve and open the back pressure valve.

[0106] In the embodiments of this application, high-temperature air output from an air compressor is used to dilute the gas concentration in the tailpipe and heat the fuel cycle system and fuel cell stack. This not only results in a fast cold start but also avoids energy consumption of accessories.

[0107] In another optional embodiment, the control method of the circulation system described above is applicable to the start-up of fuel cells at any temperature, especially for cold starts of fuel cells in low-temperature environments. However, using the control method of the circulation system in this embodiment at temperatures where cold starts are not necessary may result in unnecessary energy consumption. Therefore, to reduce unnecessary energy consumption, embodiments of this application may configure the fuel cell to use the control method of the circulation system in this application only during cold starts in low-temperature environments.

[0108] Specifically, before heating the fuel cell stack and fuel cycle system in response to the start signal in the steps of the above embodiments, the current ambient temperature can be detected. If the current ambient temperature is higher than the preset temperature and the cold start condition is not met, the fuel cell can start normally according to the start-up method in the prior art. If the current ambient temperature is lower than the preset temperature and the cold start condition is met, the fuel cell can respond to the start signal to heat the fuel cell stack and fuel cycle system until the fuel cell stack and fuel system reach the cold start condition, thereby reducing unnecessary energy consumption.

[0109] In another alternative embodiment, the steps of the above embodiments heat the fuel cell stack and fuel cycle system, which can be implemented in the following way:

[0110] The bypass valve in the heat exchange system is opened, the air compressor in the air circulation system is started, the exhaust valve in the fuel circulation system is opened at a preset frequency, and the fuel control valve in the fuel circulation system is opened to heat the fuel stack and the fuel circulation system.

[0111] Specifically, in this embodiment, the fuel cell stack and fuel circulation system are heated before the fuel cell is officially started. This is achieved by controlling the bypass valve to a preset opening, controlling the air compressor to start at a preset speed, controlling the exhaust valve to operate at a preset frequency, and controlling the fuel control valve to open, so that the high-temperature gas output from the exhaust pipe exchanges heat with the fuel in the heat exchange equipment, thereby increasing the fuel temperature. Furthermore, the back pressure valve can be controlled to close, further increasing the temperature of the high-temperature gas output from the exhaust pipe and improving heat exchange efficiency.

[0112] It's important to note that controlling the back pressure valve to shut off further increases the temperature of the high-temperature gas output from the tailpipe. This is because if the back pressure valve is open, the high-temperature gas output from the air compressor enters the tailpipe via two paths: one through a bypass line, and the other after being cooled by the intercooler. When these two paths merge, the overall temperature of the combined gas in the tailpipe is lower because one of the paths has undergone cooling. However, if the back pressure valve is shut off, the high-temperature air output from the air compressor enters the tailpipe via only one path, without undergoing cooling, resulting in a higher temperature.

[0113] It should also be noted that the purpose of controlling the exhaust valve to conduct at a preset frequency is to allow some of the fuel entering the fuel circulation line to be discharged through the exhaust valve, so that the heated fuel can continuously enter the fuel circulation line to heat the fuel circulation line and the fuel cell stack. The frequency requirement for the exhaust valve to conduct in this embodiment is the same as that in the above embodiments. Those skilled in the art can refer to the descriptions in the above embodiments, and this embodiment will not repeat them.

[0114] Those skilled in the art can set the preset opening degree of the bypass valve and the preset speed of the air compressor according to the actual situation, and this embodiment does not limit them.

[0115] Furthermore, during the process of controlling the opening of the fuel control valve to deliver fuel to the fuel circulation pipeline, the fuel flow rate and pressure in the fuel circulation pipeline can be monitored in real time. When the fuel flow rate or fuel pressure in the fuel circulation pipeline is outside the preset range, the on / off ratio of the fuel control valve can be adjusted using PID control to ensure that the fuel flow rate and pressure in the fuel circulation pipeline are both within the corresponding preset range. If the fuel control valve does not have a proportional adjustment function, in the embodiments of this application, the on / off ratio of the fuel delivery device Q can be adjusted to ensure that the fuel flow rate and pressure in the fuel circulation pipeline are both within the corresponding preset range.

[0116] In the above embodiments, the high-temperature air output from the air compression equipment is used to heat the fuel cycle system and the fuel cell stack, resulting in a fast cold start speed.

[0117] In another optional embodiment, before the steps of the above embodiments control the opening of the fuel control valve in the fuel circulation system, the following steps are further included:

[0118] The temperature of the heat exchanger is detected; if the temperature of the heat exchanger reaches the first set temperature, the fuel control valve is opened.

[0119] Specifically, in low-temperature environments, the air compressor can be started and the bypass valve opened first, while the fuel control valve remains closed. The air compressor compresses the air, outputting high-temperature air that enters the heat exchange pipeline to preheat the heat exchange equipment. Once the temperature of the heat exchange equipment reaches the first set temperature, the fuel control valve is then opened to ensure that the fuel is rapidly heated after entering the main pipeline. For example, if the fuel is hydrogen, and the temperature of the high-temperature gas in the heat exchange pipeline is around 80°C, if the heat exchange equipment has been preheated, the hydrogen can be rapidly heated to around 50°C.

[0120] Compared to the above embodiments, which control the air compressor to start, control the bypass valve to open, and control the fuel control valve to open simultaneously, this embodiment first controls the air compressor to start and controls the bypass valve to open to preheat the heat exchange equipment. When the temperature of the heat exchange equipment reaches the first set temperature, the fuel control valve is then opened. When fuel is introduced into the main pipeline 10, the fuel can be heated quickly, thereby shortening the cold start time.

[0121] The first set temperature can be set according to the actual situation, and this embodiment does not limit it.

[0122] In another alternative embodiment, such as Figure 6 As shown, the steps in the above embodiments for detecting whether the fuel cell stack and fuel cycle system have met the cold start conditions can be implemented in the following ways:

[0123] S401. Check whether the fuel cell stack and fuel cycle system have reached the corresponding set temperature.

[0124] Temperature detection devices installed on the fuel cell stack and fuel cycle system can be used to detect whether both the fuel cell stack and fuel cycle system have reached their respective set temperatures.

[0125] S402. If both the fuel cell stack and the fuel cycle system reach the corresponding set temperature, it means that both the fuel cell stack and the fuel cycle system have met the cold start conditions.

[0126] When both the fuel cell stack and the fuel cycle system reach their respective set temperatures, it indicates that both the fuel cell stack and the fuel cycle system have met the cold start conditions.

[0127] In this embodiment, the temperature of the fuel cell stack and fuel cycle system can reflect their true state under low-temperature conditions. Using the temperature of the fuel cell stack and fuel cycle system as the standard for whether the fuel cell stack and fuel cycle system have met the cold start conditions can more accurately determine whether the fuel cell stack and fuel cycle system have met the cold start conditions, thereby improving the efficiency of cold start.

[0128] In another alternative embodiment, such as Figure 7 As shown, the steps in the above embodiment for detecting whether the fuel cycle system has reached the corresponding set temperature can be implemented in the following way:

[0129] S501. Detect whether the exhaust valve in the fuel circulation system has reached the second set temperature, and detect whether the pressure regulating valve in the fuel circulation system has reached the third set temperature.

[0130] In the embodiments of this application, the determination of whether the fuel circulation system has reached a preset temperature is made by detecting the temperatures of the exhaust valve and the pressure regulating valve. Specifically, it can be detected whether the exhaust valve has reached a second preset temperature and whether the pressure regulating valve has reached a third preset temperature.

[0131] The second and third set temperatures can be set according to actual conditions, and this embodiment does not impose any limitations.

[0132] Furthermore, it should be noted that a temperature sensor can be installed at the exhaust valve to obtain its temperature. Pressure regulating valves, such as hydrogen injection valves, typically have a temperature-sensing chip that can sense the temperature at the junction of fresh and recycled hydrogen. Therefore, the temperature measured by the pressure regulating valve can be directly obtained as the pressure regulating valve's temperature.

[0133] S502. If the exhaust valve reaches the second set temperature and the pressure regulating valve reaches the third set temperature, it means that the fuel circulation system has reached the corresponding set temperature.

[0134] When the exhaust valve reaches the second set temperature and the pressure regulating valve reaches the third set temperature, it indicates that the fuel circulation system has reached the corresponding set temperature.

[0135] If the exhaust valve reaches the second set temperature, but the pressure regulating valve does not reach the third set temperature, it means that the fuel circulation system has not reached the corresponding set temperature; similarly, if the pressure regulating valve reaches the third set temperature, but the exhaust valve does not reach the second set temperature, it means that the fuel circulation system has not reached the corresponding set temperature.

[0136] In this embodiment, when both the exhaust valve and the pressure regulating valve reach their respective set temperatures, it indicates that the fuel cycle system has reached its corresponding set temperature. This is to prevent the fuel cell from starting before reaching a cold start condition, thereby improving cold start efficiency.

[0137] The fuel cell stack is equipped with a device for sensing the stack temperature. In the embodiments of this application, the stack temperature can be obtained in real time through the device for sensing the stack temperature in order to determine whether the stack temperature has reached the preset temperature.

[0138] In another optional embodiment, if the fuel cell stack and fuel cycle system meet the cold start conditions in the above embodiments, and the cold start is determined to be complete, the steps may specifically include the following:

[0139] Control the bypass valve to shut off.

[0140] In this embodiment, once the temperature of the fuel cell stack and fuel cycle system reaches the preset temperature, the cold start is completed. Then, the bypass valve is controlled to close and the back pressure valve is controlled to open, so that the fuel cell can enter the normal operating state and convert chemical energy into electrical energy.

[0141] Corresponding to the control method of the above-described circulatory system, embodiments of this application also disclose a control device for the circulatory system, see [link to relevant documentation]. Figure 8 As shown, the device includes:

[0142] Acquisition module 600 is used to acquire the start signal of the fuel cell;

[0143] Heating module 610 is used to heat the fuel cell stack and fuel cycle system in response to a start signal;

[0144] The detection module 620 is used to detect whether the fuel cell stack and fuel cycle system have met the cold start conditions;

[0145] The determination module 630 is used to determine that the cold start is complete if the fuel cell stack and fuel cycle system meet the cold start conditions.

[0146] In the embodiments of this application, high-temperature air output from an air compressor is used to dilute the gas concentration in the tailpipe and heat the fuel cycle system and fuel cell stack. This not only results in a fast cold start but also avoids energy consumption of accessories.

[0147] In another optional embodiment, the heating module 610 of the above embodiments includes:

[0148] The control unit is used to control the opening of the bypass valve in the heat exchange system, control the start of the air compressor in the air circulation system, control the opening of the exhaust valve in the fuel circulation system at a preset frequency, and control the opening of the fuel control valve in the fuel circulation system to heat the fuel stack and the fuel circulation system.

[0149] In another optional embodiment, the control unit of the above embodiments includes:

[0150] The first detection subunit is used to detect the temperature of the heat exchange equipment;

[0151] The control subunit is used to control the fuel control valve to open if the temperature of the heat exchanger reaches the first set temperature.

[0152] In another optional embodiment, the detection module 620 of the above embodiments includes:

[0153] The detection unit is used to detect whether the fuel stack and fuel cycle system have reached the corresponding set temperature.

[0154] The determination unit is used to indicate that the fuel cell stack and fuel cycle system have reached the cold start conditions if both the fuel cell stack and the fuel cycle system have reached the corresponding set temperature.

[0155] In another optional embodiment, the detection unit of the above embodiments includes:

[0156] The second detection subunit is used to detect whether the exhaust valve in the fuel circulation system has reached the second set temperature, and to detect whether the pressure regulating valve in the fuel circulation system has reached the third set temperature.

[0157] The determination subunit is used to indicate that the fuel circulation system has reached the corresponding set temperature if the exhaust valve reaches the second set temperature and the pressure regulating valve reaches the third set temperature.

[0158] In another optional embodiment, the control device for the circulation system in the above embodiments includes:

[0159] The control module is used to control the bypass valve to shut off.

[0160] The control device for the circulatory system provided in this embodiment belongs to the same concept as the control method for the circulatory system provided in the embodiments of this application. It can execute the control method for the circulatory system provided in any embodiment of this application and has the corresponding functional modules and beneficial effects for executing the control method for the circulatory system. Technical details not described in detail in this embodiment can be found in the control method for the circulatory system provided in the embodiments of this application, and will not be repeated here.

[0161] Corresponding to the control method of the above-described cyclic system, this application also discloses a control device, see [link to relevant documentation]. Figure 9 As shown, the control device includes: one or more memories 700, one or more processors 710, and a computer program stored in the memory 700 and executed by the processor 710.

[0162] The processor 710 may be a central processing unit (CPU) or other form of processing unit with data processing capabilities and / or instruction execution capabilities, and may control other components in the control device to perform desired functions.

[0163] The memory 700 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 710 may execute the program instructions to implement the control methods of the loop systems in the various embodiments of this application described above, and / or other desired functions. Various contents such as input signals, signal components, and noise components may also be stored in the computer-readable storage medium.

[0164] In another alternative embodiment, the control device may further include an input device 720 and an output device 730, which are interconnected via a bus system and / or other forms of connection mechanism (not shown).

[0165] Input device 720 may include a device for receiving data and information input by the user, such as a keyboard, mouse, camera, scanner, light pen, voice input device, touch screen, pedometer, or gravity sensor.

[0166] Output device 730 can be a device that outputs various information to the outside, such as a display, speaker, printer, communication network and its connected remote output devices, etc.

[0167] Of course, to simplify, Figure 9Only some of the components of the control device relevant to this application are shown in this illustration; components such as buses, input / output interfaces, etc., are omitted. In addition, the control device may include any other suitable components depending on the specific application.

[0168] In addition to the methods and devices described above, embodiments of this application may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps in the control method of the cyclic system described above.

[0169] Computer program products can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0170] Furthermore, embodiments of this application may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor 710 to perform the steps in the control method of the loop system in the above embodiments.

[0171] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0172] In another optional embodiment, embodiments of this application also provide a fuel cell, such as... Figure 10 As shown, the fuel cell in this embodiment includes a stack 800, a circulation system 810 as described in the previous embodiment, and a control device as described in the previous embodiment.

[0173] The control equipment is connected to the fuel cell stack 800 to obtain the temperature of the fuel cell stack 800. The control equipment is also electrically connected to the circulation system 810, specifically to various devices within the circulation system 810 that detect temperature, flow rate, and pressure, as well as fuel control valves, pressure regulating valves, safety valves, exhaust valves, air compressors, back pressure valves, and bypass valves. This allows the control equipment to obtain the temperature, pressure, and flow rate of various parts of the circulation system 810, and also to control the operating status of devices such as fuel control valves, pressure regulating valves, safety valves, exhaust valves, air compressors, back pressure valves, and bypass valves.

[0174] The circulation system 810 is connected to the 800 fuel cell stack and is also connected to the fuel delivery equipment Q.

[0175] In another optional embodiment, the present application also provides a mechanical device including the fuel cell of the above embodiments.

[0176] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0177] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0178] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0179] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0180] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0181] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A heat exchange system, characterized in that, A circulation system for a fuel cell, the circulation system comprising the heat exchange system and the fuel circulation system; the heat exchange system comprising: heat exchange equipment; The heat exchange equipment includes a main pipeline and heat exchange pipelines; The input end of the main pipeline is connected to the fuel delivery equipment of the fuel cell, and the output end of the main pipeline is connected to the fuel input end of the fuel circulation system; the input end of the heat exchange pipeline is connected to the output end of the fuel cell exhaust pipeline, and the exhaust gas in the exhaust pipeline is directly discharged into the atmosphere through the output end of the heat exchange pipeline; the fuel circulation system is used to combine the newly fed fuel and the recovered fuel through the main pipeline and then input them into the fuel cell stack; the exhaust gas in the fuel cell exhaust pipeline includes the exhaust gas discharged from the air circulation system and the exhaust gas discharged from the fuel circulation system in the fuel cell; The main pipeline exchanges heat with the heat exchange pipeline to heat the fuel flowing through the main pipeline.

2. The heat exchange system according to claim 1, characterized in that, Also includes: Bypass piping and bypass valves; The bypass valve is installed on the bypass pipeline; The input end of the bypass pipe is connected to the output end of the air compression device in the air circulation system, and the output end of the bypass pipe is connected to the input end of the heat exchange pipe.

3. A fuel cell circulation system, characterized in that, Includes a fuel circulation system, an air circulation system, and a heat exchange system as described in claim 1 or 2; The fuel circulation system and the air circulation system are respectively connected to the heat exchange system; The fuel circulation system and the air circulation system are also connected to the fuel cell stack.

4. A control method for a cyclic system, characterized in that, The method, applied to the circulation system of the fuel cell according to claim 3, comprises: Obtain the start signal of the fuel cell; In response to the start-up signal, the fuel cell stack and the fuel cycle system are heated; Check whether the fuel cell stack and the fuel cycle system have met the cold start conditions; If the fuel cell stack and the fuel cycle system meet the cold start conditions, then the cold start is considered complete.

5. The control method for the cyclic system according to claim 4, characterized in that, Heating the fuel cell stack and the fuel cycle system includes: The bypass valve in the heat exchange system is opened, the air compressor in the air circulation system is started, the exhaust valve in the fuel circulation system is opened at a preset frequency, and the fuel control valve in the fuel circulation system is opened to heat the fuel stack and the fuel circulation system.

6. The control method for a cyclic system according to claim 5, characterized in that, Before controlling the opening of the fuel control valve in the fuel circulation system, the following is also included: Detect the temperature of the heat exchanger; If the temperature of the heat exchanger reaches the first set temperature, the fuel control valve is turned on.

7. The control method for a circulating system according to claim 4, characterized in that, Detecting whether the fuel cell stack and the fuel cycle system have met the cold start conditions includes: Check whether the fuel cell stack and the fuel cycle system have both reached the corresponding set temperature; If both the fuel cell stack and the fuel cycle system reach their respective set temperatures, it indicates that both the fuel cell stack and the fuel cycle system have met the cold start conditions.

8. The control method for a circulating system according to claim 7, characterized in that, Checking whether the fuel cycle system has reached the corresponding set temperature includes: The system detects whether the exhaust valve in the fuel circulation system has reached a second set temperature, and detects whether the pressure regulating valve in the fuel circulation system has reached a third set temperature. If the exhaust valve reaches the second set temperature, and the pressure regulating valve reaches the third set temperature, then the fuel circulation system has reached the corresponding set temperature.

9. The control method for a cyclic system according to claim 5, characterized in that, If the fuel cell stack and the fuel cycle system meet the cold start conditions, then after determining that the cold start is complete, the process further includes: Control the bypass valve to shut off.

10. A control device for a circulating system, characterized in that, The device is applied to the circulation system of the fuel cell according to claim 3, the device comprising: The acquisition module is used to acquire the start signal of the fuel cell; A heating module is used to heat the fuel cell stack and the fuel cycle system in response to the start-up signal; The detection module is used to detect whether the fuel cell stack and the fuel cycle system have reached the cold start conditions; The determination module is used to determine that the cold start is complete if the fuel cell stack and the fuel cycle system meet the cold start conditions.

11. A control device, comprising a memory, a processor, and a computer program stored in the memory and executed by the processor, characterized in that, When the processor executes the computer program, it implements the steps of the control method for the fuel cell air circulation system as described in any one of claims 4 to 9.

12. A fuel cell, characterized in that, It includes a fuel cell stack, a fuel cell circulation system as described in claim 3, and a control device as described in claim 11; The control device is electrically connected to the circulation system of the fuel cell and the fuel cell stack; The circulation system of the fuel cell is connected to the fuel cell stack.

13. A mechanical device, characterized in that, Includes the fuel cell described in claim 12.

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