Heat recovery regulation and control method, device, system and equipment for multi-stack fuel cells

Abstract

The invention relates to a heat recovery regulation and control method, device, system and equipment of a multi-stack fuel cell. The method comprises the following steps: a first controller regulates and controls the rotating speed of a first coolant pump according to the difference value between the actual detection temperature of the multi-stack fuel cell at the current moment and the corresponding critical set temperature; the second controller regulates and controls the rotating speed of the second coolant pump according to the difference value between the actual detection temperature of the coolant inlet of the first heat exchanger at the current moment and the corresponding critical set temperature, and the third controller regulates and controls the rotating speed of the second coolant pump according to the inlet temperature of the hot water tank and the actual detection temperature of the multi-stack fuel cells at the current moment. The rotating speed of the first water pump is regulated and controlled, and the rotating speed of the second water pump is regulated and controlled by the fourth controller according to the outlet temperature of the hot water tank and the heat demand quantity of the user side. By adopting the method, the reliability of the heat recovery regulation and control method can be improved, safe and efficient operation of multiple stacks of fuel cells is ensured, and the safety of a heat recovery regulation and control system is further improved.

Description

Technical Field

[0001] The present application relates to the field of heat recovery technology, and in particular to a heat recovery control method, device, system and equipment for multiple fuel cell stacks. Background Art

[0002] With the development of technology, multi-stack fuel cells are widely used due to their significant advantages such as high energy density, high efficiency and environmental protection. In order to improve the overall efficiency of multi-stack fuel cells, it is necessary to recover the waste heat of multi-stack fuel cells.

[0003] In practical applications, a heat recovery control system recovers waste heat from a macroscopic perspective based on user-side electric heating needs. To improve the safety of the heat recovery control system, it must be regulated during the waste heat recovery process. In related technologies, a heat recovery control system includes at least multiple fuel cell stacks and multiple coolant pumps, primarily controlling a specific coolant pump to complete the heat recovery operation.

[0004] However, the way of regulating the heat recovery control system in the related art may result in a lower safety of the heat recovery control system. Summary of the Invention

[0005] Based on this, it is necessary to provide a heat recovery control method, device, system and equipment for multiple fuel cell stacks to address the above technical problems.

[0006] In a first aspect, the present application provides a heat recovery control method for a multi-stack fuel cell, which is applied to a controller group in a heat recovery control system, the controller group including a first controller, a second controller, a third controller, and a fourth controller, and the heat recovery control system also including a multi-stack fuel cell, a first coolant pump, a second coolant pump, a first water pump, a second water pump, a hot water tank, and a first heat exchanger, including:

[0007] The first controller regulates the rotation speed of the first coolant pump according to the difference between the actual detected temperature of the multiple fuel cell stacks at the current moment and the corresponding critical set temperature;

[0008] The second controller regulates the speed of the second coolant pump according to the difference between the actual detected temperature of the coolant inlet of the first heat exchanger at the current moment and the corresponding critical set temperature;

[0009] The third controller adjusts the speed of the first water pump according to the current inlet temperature of the hot water tank and the actual detected temperatures of the multiple fuel cell stacks;

[0010] The fourth controller regulates the rotation speed of the second water pump according to the outlet temperature of the hot water tank and the heat demand on the user side.

[0011] In one embodiment, before the first controller regulates the rotation speed of the first coolant pump, the method further includes:

[0012] The critical set temperature of the multiple fuel cell stacks at the current moment is determined according to the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at the current moment and the critical set temperature of the multiple fuel cell stacks at the previous moment.

[0013] In one embodiment, determining the critical set temperature of the multiple fuel cell stacks at a current moment based on the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at a current moment and the critical set temperature of the multiple fuel cell stacks at a previous moment includes:

[0014] When the temperature difference is less than the first preset threshold and the critical set temperature of the multiple stacks of fuel cells at the previous moment is greater than or equal to the second preset threshold, or when the temperature difference is greater than or equal to the first preset threshold and less than the third preset threshold, or when the temperature difference is greater than the third preset threshold and the critical set temperature of the multiple stacks of fuel cells at the previous moment is less than or equal to the fourth preset threshold, the critical set temperature of the multiple stacks of fuel cells at the previous moment is determined as the critical set temperature of the multiple stacks of fuel cells at the current moment;

[0015] When the temperature difference is less than the first preset threshold and the critical set temperature of the multiple stacks of fuel cells at the previous moment is less than the second preset threshold, the critical set temperature of the multiple stacks of fuel cells at the previous moment is increased to obtain the critical set temperature of the multiple stacks of fuel cells at the current moment;

[0016] When the temperature difference is greater than the third preset threshold and the critical set temperature of the multiple fuel cell stacks at the previous moment is greater than the fourth preset threshold, the critical set temperature of the multiple fuel cell stacks at the previous moment is adjusted down to obtain the critical set temperature of the multiple fuel cell stacks at the current moment; the first preset threshold, the third preset threshold, the fourth preset threshold and the second preset threshold increase in sequence.

[0017] In one embodiment, before the second controller regulates the rotational speed of the second coolant pump, the method further includes:

[0018] The critical set temperature of the coolant inlet of the first heat exchanger at the current moment is determined according to the cold fluid outlet temperature of the first heat exchanger at the current moment and the preset heat exchange temperature difference range.

[0019] In one embodiment, the third controller regulates the speed of the first water pump according to the current inlet temperature of the hot water tank and the actual detected temperatures of the multiple fuel cell stacks, including:

[0020] When the inlet temperature is less than a fifth preset threshold, the speed of the first water pump is regulated according to the difference between the inlet temperature and the fifth preset threshold;

[0021] When the inlet temperature is greater than or equal to the fifth preset threshold and the actual detected temperature is greater than the sixth preset threshold, the rotational speed of the first water pump is regulated according to the difference between the actual detected temperature and the sixth preset threshold.

[0022] In one embodiment, the fourth controller regulates the speed of the second water pump according to the outlet temperature of the hot water tank and the heat demand of the user side, including:

[0023] When the outlet temperature is less than a seventh preset threshold, the speed of the second water pump is regulated according to the difference between the outlet temperature and the seventh preset threshold;

[0024] When the outlet temperature is greater than or equal to the seventh preset threshold, the rotation speed of the second water pump is regulated according to the difference between the outlet heat and the heat demand on the user side.

[0025] In a second aspect, the present application further provides a heat recovery control device for a multi-stack fuel cell, comprising:

[0026] a first control module, configured to control the rotation speed of the first coolant pump according to a difference between an actual detected temperature of the plurality of fuel cell stacks at a current moment and a corresponding critical set temperature;

[0027] a second control module, configured to control the rotation speed of the second coolant pump according to a difference between an actual detected temperature at the coolant inlet of the first heat exchanger at a current moment and a corresponding critical set temperature;

[0028] a third control module, configured to control the rotation speed of the first water pump according to the current inlet temperature of the hot water tank and the actual detected temperatures of the multiple fuel cell stacks;

[0029] The fourth control module is used to control the rotation speed of the second water pump according to the outlet temperature of the hot water tank and the heat demand on the user side.

[0030] In a third aspect, the present application also provides a heat recovery control system for multiple fuel cell stacks, the heat recovery control system including a controller group, multiple fuel cell stacks, a first coolant pump, a second coolant pump, a first water pump, a second water pump, a hot water tank, and a first heat exchanger, the controller group including a first controller, a second controller, a third controller, and a fourth controller;

[0031] A controller group is used to execute the steps of the method in any embodiment of the first aspect above.

[0032] In a fourth aspect, the present application further provides a computer device comprising a memory and a controller, wherein the memory stores a computer program, and when the controller executes the computer program, the steps of the method in any embodiment of the first aspect are implemented.

[0033] In a fifth aspect, the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a controller, the steps of the method in any embodiment of the first aspect are implemented.

[0034] In a sixth aspect, the present application further provides a computer program product, comprising a computer program, which, when executed by a controller, implements the steps of the method in any embodiment of the first aspect above.

[0035] The heat recovery control method, device, system and equipment of multiple fuel cell stacks provided in the embodiments of the present application are applied to a controller group in a heat recovery control system, the controller group includes a first controller, a second controller, a third controller and a fourth controller, the heat recovery control system also includes multiple fuel cell stacks, a first coolant pump, a second coolant pump, a first water pump, a second water pump, a hot water tank and a first heat exchanger, the first controller controls the rotation speed of the first coolant pump according to the difference between the actual detection temperature of the multiple fuel cell stacks at the current moment and the corresponding critical set temperature, the second controller controls the rotation speed of the second coolant pump according to the difference between the actual detection temperature of the coolant inlet of the first heat exchanger at the current moment and the corresponding critical set temperature, the third controller controls the rotation speed of the first water pump according to the inlet temperature of the hot water tank at the current moment and the actual detection temperature of the multiple fuel cell stacks The fourth controller controls the speed of the second water pump according to the outlet temperature of the hot water tank and the heat demand on the user side; the above method can synchronously control the speed of the first coolant pump, the speed of the second coolant pump, the speed of the first water pump and the speed of the second water pump during the heat recovery process of the heat recovery control system. Compared with traditional technologies, it can simultaneously meet the control requirements of the temperature of multiple fuel cell stacks, the temperature difference of the coolant inlet and outlet of multiple fuel cell stacks, the heat recovery temperature of the hot water tank and the supply temperature of the hot water tank, thereby improving the reliability of the heat recovery control method. On this basis, it can ensure the safe and efficient operation of the multiple fuel cell stacks, improve the safety of the heat recovery control system, and at the same time, on the basis of meeting multiple control requirements at the same time, it can ensure the effective recovery of waste heat of multiple driving components in the heat recovery control system, and improve the energy utilization rate of the heat recovery control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments of the present application or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1A diagram illustrating an application environment of a heat recovery control method for multiple fuel cell stacks in one embodiment;

[0038] Figure 2 A schematic flow chart of a heat recovery control method for multiple fuel cell stacks in one embodiment;

[0039] Figure 3 A schematic flow chart of a heat recovery control method for multiple fuel cell stacks in another embodiment;

[0040] Figure 4 A schematic flow chart of a heat recovery control method for multiple fuel cell stacks in another embodiment;

[0041] Figure 5 A schematic flow chart of a heat recovery control method for multiple fuel cell stacks in another embodiment;

[0042] Figure 6 A structural block diagram of a heat recovery control device for multiple fuel cell stacks in one embodiment;

[0043] Figure 7 FIG. 1 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0045] The heat recovery control method for multiple fuel cell stacks provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown, the heat recovery control system of multiple fuel cell stacks in the application environment includes a controller group, multiple fuel cell stacks and multiple drive components, the multiple drive components include a first valve 1, a first heat exchanger 2, a first radiator 3, a first three-way valve 4, a first coolant pump 5, an air filter 6, an air compressor 7, a second heat exchanger 8, multiple fuel cell stacks 9, a second coolant pump 10, an AC-DC converter 11, a second three-way valve 12, a second radiator 13, a third heat exchanger 14, a fourth heat exchanger 15, a second valve 16, a first water pump 17, a second water pump 18, a cold water tank 19, a hot water tank 20, a third three-way valve 21 and an expander 22, the controller group includes a first controller, a second controller, a third controller and a fourth controller, Figure 1 Different lines represent different types of connecting pipes. Each drive component can be equipped with a processing chip or controller to control its operating status, speed, and other parameters. The following examples illustrate the specific process of a multi-stack fuel cell heat recovery control method, using a controller group as the execution entity.

[0046] In an exemplary embodiment, Figure 2 As shown, a heat recovery control method for multiple fuel cell stacks is provided, which is applied to a controller group in a heat recovery control system. The controller group includes a first controller, a second controller, a third controller, and a fourth controller. The heat recovery control system also includes multiple fuel cell stacks, a first coolant pump, a second coolant pump, a first water pump, a second water pump, a hot water tank, and a first heat exchanger. The method can be implemented by the following steps:

[0047] S101 , a first controller regulates the rotation speed of a first coolant pump according to a difference between an actual detected temperature of a plurality of fuel cell stacks at a current moment and a corresponding critical set temperature.

[0048] In practical applications, the critical set temperature of the fuel cell stacks at the current moment can be understood as the maximum temperature that the fuel cell stacks can withstand while ensuring the safety of the fuel cell stacks at the current moment. In the embodiment of the present application, the fuel cell stacks may be megawatt-class fuel cells.

[0049] Specifically, the first controller can pre-train an algorithm model, and then input the difference between the actual detection temperature of the multiple fuel cell stacks at the current moment and the corresponding critical set temperature into the algorithm model. The algorithm model outputs the result of whether to regulate the speed of the first coolant pump. If the output result is yes, the speed of the first coolant pump is regulated; otherwise, there is no need to regulate the speed of the first coolant pump.

[0050] At the same time, the first controller can analyze and process the difference between the actual detection temperature of multiple fuel cell stacks at the current moment and the corresponding critical set temperature, and determine whether it is necessary to regulate the speed of the first coolant pump based on the analysis and processing results. If it is determined to be necessary, the speed of the first coolant pump is controlled to be regulated.

[0051] It should be noted here that regulating the rotational speed of the first coolant pump is to adjust the rotational speed of the first coolant pump. On this basis, the coolant flow driven by the first coolant pump is adjusted so that the temperature of the multiple fuel cell stacks can be effectively controlled, ensuring efficient, stable and long-life operation of the multiple fuel cell stacks, thereby improving the safety and energy utilization of the heat recovery control system.

[0052] In addition, the process of adjusting the speed of the first coolant pump can also be called the circulation process of the first coolant pump. During this process, the outlet end of the first coolant pump in the heat recovery control system is connected to the inlet end of the first three-way valve in the heat recovery control system through a coolant pipe, and the outlet end of the first three-way valve is respectively connected to the inlet end of the third heat exchanger in the heat recovery control system and the inlet end of the first radiator in the heat recovery control system through a coolant pipe; wherein, during the circulation of the first coolant pump, the heat recovery control system can enter a waste heat utilization mode, in which mode, the outlet end of the first heat exchanger is respectively connected to the inlet end of the second heat exchanger in the heat recovery control system and the inlet end of the multiple fuel cell stacks through a coolant pipe; the heat recovery control system can also enter a heat dissipation mode, in which mode, the outlet end of the first radiator in the heat recovery control system is respectively connected to the inlet end of the second heat exchanger in the heat recovery control system and the inlet end of the multiple fuel cell stacks through a coolant pipe; and the outlet end of the second heat exchanger and the outlet end of the multiple fuel cell stacks are connected to the inlet end of the first coolant pump through a coolant pipe to form a circulation of the first coolant pump.

[0053] S102: The second controller regulates the rotation speed of the second coolant pump according to the difference between the actual detected temperature of the coolant inlet of the first heat exchanger at the current moment and the corresponding critical set temperature.

[0054] The critical set temperature of the coolant inlet of the first heat exchanger at the current moment can be understood as the maximum temperature that the first heat exchanger can withstand while ensuring the safety of the first heat exchanger at the current moment.

[0055] Specifically, the second controller can input the difference between the actual detected temperature of the coolant inlet of the first heat exchanger at the current moment and the corresponding critical set temperature into the algorithm model, and the algorithm model outputs the result of whether to regulate the speed of the second coolant pump. If the output result is yes, the speed of the second coolant pump is regulated; otherwise, there is no need to regulate the speed of the second coolant pump.

[0056] In addition, the second controller can analyze and process the difference between the actual detected temperature of the coolant inlet of the first heat exchanger at the current moment and the corresponding critical set temperature, and determine whether it is necessary to regulate the speed of the second coolant pump based on the analysis and processing results. If it is determined to be necessary, the speed of the second coolant pump is controlled to be regulated.

[0057] It should be noted here that regulating the speed of the second coolant pump means adjusting the speed of the second coolant pump. On this basis, the coolant flow driven by the second coolant pump is adjusted to ensure that the temperature difference between the hot fluid and the cold fluid of the first heat exchanger is within a reasonable range.

[0058] In addition, the process of adjusting the speed of the second coolant pump can also be called the circulation process of the second coolant pump. In this process, the outlet end of the second coolant pump is connected to the inlet end of the air compressor and the inlet end of the AC-DC converter in the heat recovery control system through a coolant pipe; wherein, during the circulation of the second coolant pump, the heat recovery control system can enter the waste heat recovery mode, in which the outlet end of the air compressor in the heat recovery control system and the outlet end of the AC-DC converter in the heat recovery control system are connected to the inlet end of the second radiator and the inlet end of the third heat exchanger through the coolant pipe via the inlet end of the second three-way valve; the heat recovery control system can also enter the heat dissipation mode, in which the outlet end of the second radiator is connected to the inlet end of the second coolant pump through the coolant pipe; and the inlet end of the air compressor is connected to the outlet end of the air filter, and the outlet end of the air compressor is also connected to the inlet end of the second heat exchanger to form a circulation of the second coolant pump.

[0059] S103 , the third controller adjusts the rotation speed of the first water pump according to the current inlet temperature of the hot water tank and the actual detected temperatures of the multiple fuel cell stacks.

[0060] Among them, the third controller can analyze and process the inlet temperature of the hot water tank at the current moment and the actual detection temperature of multiple fuel cell stacks at the current moment, and determine whether it is necessary to regulate the speed of the first water pump based on the analysis and processing results. If it is determined to be necessary, the speed of the first water pump is controlled to be regulated.

[0061] It should be noted here that regulating the rotational speed of the first water pump, that is, adjusting the rotational speed of the first water pump, can ensure that the temperature of the multiple fuel cell stacks is within a reasonable range.

[0062] S104. The fourth controller adjusts the rotation speed of the second water pump according to the outlet temperature of the hot water tank and the heat demand on the user side.

[0063] In actual applications, the fourth controller can analyze and process the outlet temperature of the hot water tank and the heat demand on the user side, and determine whether it is necessary to regulate the speed of the second water pump based on the analysis and processing results. If it is determined to be necessary, the speed of the second water pump is controlled to be regulated.

[0064] It should be noted that at least one of the above steps S100-S400 can be executed at the same time. However, in the embodiment of the present application, the above steps S100-S400 can be executed simultaneously. Figure 1 There are no arrows pointing between steps S100 - S400 in the flowchart, indicating that steps S100 - S400 can be executed simultaneously.

[0065] In the embodiment of the present application, the rotational speed of the second water pump is regulated to ensure that the supply temperature of the hot water tank reaches the heat demand on the user side.

[0066] Among them, the process of regulating the speed of the second water pump can also be called the circulation process of the second water pump. In this process, the outlet end of the hot water tank is connected to the inlet end of the second water pump through a water pipe, and the outlet end of the second water pump is connected to the inlet end of the third three-way valve through a water pipe. When the outlet temperature of the hot water tank does not meet the design requirements, the outlet end of the third three-way valve is connected to the inlet end of the cold water tank through a water pipe. When the outlet temperature of the hot water tank meets the design requirements, the outlet end of the third three-way valve is connected to the inlet end of the user side through the water pipe. During the circulation of the second water pump, the heat recovery control system can enter the waste heat utilization mode. In this mode, the outlet end on the user side is connected to the inlet end of the cold water tank through a water pipe to form the circulation of the second water pump.

[0067] The technical solution in the embodiment of the present application is applied to a controller group in a heat recovery control system, the controller group includes a first controller, a second controller, a third controller and a fourth controller, the heat recovery control system also includes multiple fuel cell stacks, a first coolant pump, a second coolant pump, a first water pump, a second water pump, a hot water tank and a first heat exchanger, the first controller controls the rotation speed of the first coolant pump according to the difference between the actual detection temperature of the multiple fuel cell stacks at the current moment and the corresponding critical set temperature, the second controller controls the rotation speed of the second coolant pump according to the difference between the actual detection temperature of the coolant inlet of the first heat exchanger at the current moment and the corresponding critical set temperature, the third controller controls the rotation speed of the first water pump according to the inlet temperature of the hot water tank at the current moment and the actual detection temperature of the multiple fuel cell stacks, and the fourth controller controls the rotation speed of the first water pump according to the difference between the actual detection temperature of the coolant inlet of the first heat exchanger at the current moment and the corresponding critical set temperature. The speed of the second water pump is regulated according to the outlet temperature of the hot water tank and the heat demand on the user side; the above method can synchronously regulate the speed of the first coolant pump, the speed of the second coolant pump, the speed of the first water pump and the speed of the second water pump during the heat recovery process of the heat recovery control system. Compared with traditional technologies, it can simultaneously meet the control requirements of the temperature of multiple fuel cell stacks, the temperature difference of the coolant inlet and outlet of multiple fuel cell stacks, the heat recovery temperature of the hot water tank and the supply temperature of the hot water tank, thereby improving the reliability of the heat recovery control method. On this basis, it can ensure the safe and efficient operation of multiple fuel cell stacks and improve the safety of the heat recovery control system. At the same time, on the basis of meeting multiple control requirements at the same time, it can ensure the effective recovery of waste heat of multiple driving components in the heat recovery control system and improve the energy utilization rate of the heat recovery control system.

[0068] The following describes the process of obtaining the critical set temperature of the multiple fuel cell stacks at the current moment. In one embodiment, before executing the step in S101, the method may further include: determining the critical set temperature of the multiple fuel cell stacks at the current moment based on the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at the current moment and the critical set temperature of the multiple fuel cell stacks at a previous moment.

[0069] In practical applications, the first controller can perform arithmetic operations on the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at the current moment and the critical set temperature of the multiple fuel cell stacks at the previous moment to obtain the critical set temperature of the multiple fuel cell stacks at the current moment.

[0070] Optionally, the arithmetic operation may be at least one of addition, subtraction, logarithm, exponential, multiplication and / or division.

[0071] In one embodiment, Figure 3 As shown, the step of determining the critical set temperature of the multiple fuel cell stacks at the current moment based on the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at the current moment and the critical set temperature of the multiple fuel cell stacks at the previous moment may include:

[0072] S105. When the temperature difference is less than the first preset threshold and the critical set temperature of the multiple fuel cell stacks at the previous moment is greater than or equal to the second preset threshold, or the temperature difference is greater than or equal to the first preset threshold and less than the third preset threshold, or the temperature difference is greater than the third preset threshold and the critical set temperature of the multiple fuel cell stacks at the previous moment is less than or equal to the fourth preset threshold, the critical set temperature of the multiple fuel cell stacks at the previous moment is determined as the critical set temperature of the multiple fuel cell stacks at the current moment.

[0073] Specifically, when the first controller determines that the temperature difference is less than the first preset threshold and the critical set temperature of the multiple fuel cells at the previous moment is greater than or equal to the second preset threshold, or the temperature difference is greater than or equal to the first preset threshold and less than the third preset threshold, or the temperature difference is greater than the third preset threshold and the critical set temperature of the multiple fuel cells at the previous moment is less than or equal to the fourth preset threshold, the critical set temperature of the multiple fuel cells at the previous moment is maintained unchanged, and the critical set temperature of the multiple fuel cells at the previous moment can be determined as the critical set temperature of the multiple fuel cells at the current moment.

[0074] S106. When the temperature difference is less than the first preset threshold and the critical set temperature of the multiple fuel cell stacks at the previous moment is less than the second preset threshold, increase the critical set temperature of the multiple fuel cell stacks at the previous moment to obtain the critical set temperature of the multiple fuel cell stacks at the current moment.

[0075] In actual applications, when the first controller determines that the temperature difference is less than the first preset threshold and the critical set temperature of the multiple fuel cells at the previous moment is less than the second preset threshold, the critical set temperature of the multiple fuel cells at the previous moment can be increased to obtain the critical set temperature of the multiple fuel cells at the current moment.

[0076] S107: If the temperature difference is greater than the third preset threshold and the critical set temperature of the multiple fuel cell stacks at the previous moment is greater than the fourth preset threshold, the critical set temperature of the multiple fuel cell stacks at the previous moment is reduced to obtain the critical set temperature of the multiple fuel cell stacks at the current moment. The first preset threshold, the third preset threshold, the fourth preset threshold, and the second preset threshold increase in sequence.

[0077] Specifically, when the first controller determines that the temperature difference is greater than the third preset threshold and the critical set temperature of the multiple fuel cell stacks at the previous moment is greater than the fourth preset threshold, the critical set temperature of the multiple fuel cell stacks at the previous moment can be reduced to obtain the critical set temperature of the multiple fuel cell stacks at the current moment.

[0078] Optionally, the above-mentioned first preset threshold, second preset threshold, third preset threshold and fourth preset threshold can all be customized or determined based on historical experience values. The specific values can be flexibly set. In the embodiment of the present application, in order to achieve the best balance between performance, efficiency and durability of the multi-stack fuel cells, the temperature of the multi-stack fuel cells can be controlled between 65°C and 85°C, and considering the uniformity of the internal temperature distribution of the multi-stack fuel cells, the temperature difference between the coolant inlet and the coolant outlet of the multi-stack fuel cells at the current moment can be controlled between 5°C and 10°C. Based on this, the specific values corresponding to the first preset threshold, the second preset threshold, the third preset threshold and the fourth preset threshold can be determined, as long as the first preset threshold, the third preset threshold, the fourth preset threshold and the second preset threshold are increased in sequence, that is, α1<α3<α4<α2, α1 represents the first preset threshold, α3 represents the third preset threshold, α4 represents the fourth preset threshold, and α2 represents the second preset threshold.

[0079] In the embodiment of the present application, the first preset threshold is equal to 5° C., the second preset threshold is equal to 85° C., the third preset threshold is equal to 10° C., and the fourth preset threshold is equal to 65° C. as an example for description.

[0080] For example, if the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at the current moment is less than 5°C, it is determined whether the critical set temperature of the multiple fuel cell stacks at the previous moment is greater than or equal to 85°C. If so, the critical set temperature of the multiple fuel cell stacks at the previous moment is determined as the critical set temperature of the multiple fuel cell stacks at the current moment. Otherwise, the critical set temperature of the multiple fuel cell stacks at the previous moment is added by 1°C to obtain the critical set temperature of the multiple fuel cell stacks at the current moment.

[0081] If the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at the current moment is greater than 5°C, then determine whether the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at the current moment is less than 10°C. If so, determine the critical set temperature of the multiple fuel cell stacks at the previous moment as the critical set temperature of the multiple fuel cell stacks at the current moment. Otherwise, determine whether the critical set temperature of the multiple fuel cell stacks at the previous moment is less than or equal to 65°C. If so, determine the critical set temperature of the multiple fuel cell stacks at the previous moment as the critical set temperature of the multiple fuel cell stacks at the current moment. Otherwise, subtract 1°C from the critical set temperature of the multiple fuel cell stacks at the previous moment to obtain the critical set temperature of the multiple fuel cell stacks at the current moment.

[0082] According to the technical solution in the embodiment of the present application, when the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at the current moment meets specific conditions, the critical set temperature of the multiple fuel cell stacks at the previous moment can be determined. The processing process is relatively simple and can speed up the determination of the critical set temperature of the multiple fuel cell stacks at the current moment.

[0083] The following describes the process of obtaining the critical set temperature at the coolant inlet of the first heat exchanger at the current moment. In one embodiment, before executing step S102, the method may further include determining the critical set temperature at the coolant inlet of the first heat exchanger at the current moment based on the cold fluid outlet temperature of the first heat exchanger at the current moment and a preset heat exchange temperature difference range.

[0084] In practical applications, the second controller may perform arithmetic operations on the current cold fluid outlet temperature of the first heat exchanger and the preset heat exchange temperature difference range to obtain the critical set temperature of the coolant inlet of the first heat exchanger at the current moment.

[0085] Alternatively, the second controller may calculate the critical set temperature of the coolant inlet of the first heat exchanger at the current moment according to a preset calculation rule, based on the cold fluid outlet temperature of the first heat exchanger at the current moment and a preset heat exchange temperature difference range.

[0086] The technical solution in the embodiment of the present application does not require human intervention in the processing process, thereby reducing the complexity of determining the critical set temperature of the coolant inlet of the first heat exchanger at the current moment.

[0087] The following describes the process of the third controller regulating the speed of the first water pump according to the current inlet temperature of the hot water tank and the actual detected temperature of the multiple fuel cell stacks. Figure 4 As shown, the steps in S103 above may include:

[0088] S113 : When the inlet temperature is lower than a fifth preset threshold, control the rotation speed of the first water pump according to the difference between the inlet temperature and the fifth preset threshold.

[0089] In an embodiment of the present application, the third controller can determine whether the inlet temperature of the hot water tank at the current moment is less than the fifth preset threshold value. When it is determined that the inlet temperature is less than the fifth preset threshold value, the difference between the inlet temperature and the fifth preset threshold value is calculated, and the speed control tool is called to input the difference between the inlet temperature and the fifth preset threshold value into the speed control tool, so that the speed control tool controls the speed of the first water pump according to the difference between the inlet temperature and the fifth preset threshold value.

[0090] In addition, when the third controller determines that the inlet temperature is less than the fifth preset threshold, it can calculate the difference between the inlet temperature and the fifth preset threshold, determine the water pump speed adjustment value based on the difference between the inlet temperature and the fifth preset threshold, and control the speed of the first water pump to be adjusted to the water pump speed adjustment value to complete the speed control of the first water pump.

[0091] S123 . When the inlet temperature is greater than or equal to the fifth preset threshold and the actual detected temperature is greater than the sixth preset threshold, control the rotation speed of the first water pump according to the difference between the actual detected temperature and the sixth preset threshold.

[0092] Among them, when the third controller determines that the inlet temperature is greater than or equal to the fifth preset threshold and the actual detection temperature is greater than the sixth preset threshold, it can calculate the difference between the actual detection temperature and the sixth preset threshold, and determine the water pump speed adjustment value based on the difference between the actual detection temperature and the sixth preset threshold, and control the speed of the first water pump to be adjusted to the water pump speed adjustment value to complete the speed control of the first water pump.

[0093] At the same time, after obtaining the difference between the actual detected temperature and the sixth preset threshold, the third controller can regulate the speed of the first water pump according to the difference between the actual detected temperature and the sixth preset threshold according to the preset regulation rule.

[0094] Optionally, the specific values corresponding to the fifth and sixth preset thresholds can be determined as long as the fifth preset threshold is less than the sixth preset threshold, that is, α5<α6, where α5 represents the fifth preset threshold and α6 represents the sixth preset threshold. In the embodiment of the present application, the fifth preset threshold is equal to 60°C and the sixth preset threshold is equal to 85°C.

[0095] For example, if the inlet temperature of the hot water tank is less than 60°C at the current moment, the third controller can regulate the speed of the first water pump according to the inlet temperature of the hot water tank and the set temperature of 60°C at the current moment to ensure that the heat recovery temperature of the heat recovery control system can meet the heat demand on the user side. Otherwise, it is determined whether the actual detection temperature of the multiple fuel cell stacks at the current moment is greater than 85°C. If so, the third controller can regulate the speed of the first water pump according to the actual detection temperature of the multiple fuel cell stacks at the current moment and the set temperature of 85°C to ensure that the temperature of the multiple fuel cell stacks is within a reasonable range. Otherwise, the third controller does not regulate the speed of the first water pump, and the heat recovery control system performs heat recovery at the current flow rate.

[0096] According to the technical solution in the embodiment of the present application, when the inlet temperature is less than the fifth preset threshold, the speed of the first water pump is regulated according to the difference between the inlet temperature and the fifth preset threshold; when the inlet temperature is greater than or equal to the fifth preset threshold and the actual detected temperature is greater than the sixth preset threshold, the speed of the first water pump is regulated according to the difference between the actual detected temperature and the sixth preset threshold; the above method can regulate the speed of the first water pump under different conditions, thereby ensuring the comprehensiveness of the speed control of the first water pump and avoiding missed control; at the same time, the above method does not require the participation of complex algorithms, thereby reducing the complexity of the speed control of the first water pump.

[0097] The following describes the process of the fourth controller regulating the speed of the second water pump according to the outlet temperature of the hot water tank and the heat demand of the user. Figure 5 As shown, the steps in the above S104 may include:

[0098] S114 : When the outlet temperature is lower than a seventh preset threshold, the rotation speed of the second water pump is regulated according to the difference between the outlet temperature and the seventh preset threshold.

[0099] Specifically, when the fourth controller determines that the outlet temperature is less than the seventh preset threshold, it can calculate the difference between the outlet temperature and the seventh preset threshold, determine the water pump speed adjustment value based on the difference between the outlet temperature and the seventh preset threshold, and control the speed of the second water pump to be adjusted to the water pump speed adjustment value to complete the speed control of the second water pump.

[0100] At the same time, after obtaining the difference between the outlet temperature and the seventh preset threshold, the fourth controller can regulate the speed of the second water pump according to the difference between the outlet temperature and the seventh preset threshold according to the preset regulation rule.

[0101] S124. When the outlet temperature is greater than or equal to a seventh preset threshold, the rotation speed of the second water pump is regulated according to the difference between the outlet heat of the hot water tank and the heat demand of the user.

[0102] Specifically, when the fourth controller determines that the outlet temperature is greater than or equal to the seventh preset threshold, it can calculate the difference between the outlet heat of the hot water tank and the heat demand on the user side, call the water pump speed control tool, and then input the difference between the outlet heat and the heat demand on the user side into the water pump speed control tool, instructing the water pump speed control tool to control the speed of the second water pump according to the difference between the outlet heat and the heat demand on the user side.

[0103] In addition, after obtaining the difference between the outlet heat and the heat demand on the user side, the fourth controller can regulate the speed of the second water pump according to the difference between the outlet heat and the heat demand on the user side according to the preset regulation rules.

[0104] For example, if the outlet temperature of the hot water tank is less than 60°C at the current moment, the fourth controller can regulate the speed of the second water pump according to the outlet temperature of the hot water tank at the current moment and the set temperature of 60°C to ensure that the supply temperature of the hot water tank meets the heat demand on the user side. Otherwise, the fourth controller can calculate the heat storage capacity of the hot water tank according to the outlet temperature of the hot water tank at the current moment, and regulate the speed of the second water pump according to the heat storage capacity and the heat demand on the user side.

[0105] It should be noted that, when the corresponding differences in the above steps S100-S400 are not zero, the following formula (1) can be used to control or adjust the speed of the first coolant pump, the speed of the second coolant pump, the speed of the first water pump, and the speed of the second water pump, that is:

[0106] (1)

[0107] in, represents the proportionality constant, represents the integration constant, represents the differential constant, t represents the current moment, Indicates the difference corresponding to the current moment.

[0108] Optionally, when the rotation speed of the first coolant pump is regulated, Indicates the difference between the actual detected temperature of the multiple fuel cell stacks at the current moment and the corresponding critical set temperature; when the speed of the second coolant pump is regulated, Indicates the difference between the actual detected temperature of the coolant inlet of the first heat exchanger at the current moment and the corresponding critical set temperature; when the speed of the first water pump is regulated, Indicates the difference between the inlet temperature of the hot water tank at the current moment and the fifth preset threshold value; when the speed of the second water pump is regulated, Indicates the difference between the outlet temperature of the hot water tank at the current moment and the seventh preset threshold.

[0109] The technical solution in the embodiment of the present application is that when the outlet temperature is less than the seventh preset threshold, the speed of the second water pump is regulated according to the difference between the outlet temperature and the seventh preset threshold; when the outlet heat is greater than or equal to the seventh preset threshold, the speed of the second water pump is regulated according to the difference between the outlet temperature and the heat demand on the user side; the above method can regulate the speed of the second water pump under different conditions, so as to ensure the comprehensiveness of the speed control of the second water pump and avoid missed control; at the same time, the above method does not require the participation of complex algorithms, thereby reducing the complexity of the speed control of the second water pump.

[0110] It should be understood that, although the steps in the flowcharts of the above embodiments are shown in sequence as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be performed in other orders. Moreover, at least a portion of the steps in the flowcharts of the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily to be performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0111] The embodiment of the present application also provides a heat recovery control system for multiple fuel cell stacks, the heat recovery control system including a controller group, multiple fuel cell stacks, a first coolant pump, a second coolant pump, a first water pump, a second water pump, a hot water tank, and a first heat exchanger, the controller group including a first controller, a second controller, a third controller, and a fourth controller;

[0112] A controller group is used to execute the steps of the method in any of the above embodiments.

[0113] Among them, the heat recovery and control system of multiple fuel cell stacks can also include a first valve, a first radiator, a first three-way valve, an air filter, an air compressor, a second heat exchanger, an AC-DC converter, a second three-way valve, a second radiator, a third heat exchanger, a fourth heat exchanger, a second valve, a cold water tank, a third three-way valve and an expander.

[0114] In practical applications, the heat recovery control system may include multiple containers. The drive components in each container are the same, and the multiple fuel cell stacks installed in each container may be the same or different. In the embodiment of this application, the control system includes four containers as an example. These four containers are container 1, container 2, container 3 and container 4. Figure 1 Only the specific drive components and multiple fuel cell stacks in container 1 are shown, and the specific drive components and multiple fuel cell stacks in containers 2, 3, and 4 are not shown. Specifically, in the branch of container 1, the outlet of the first water pump is connected to the inlet of the first heat exchanger and the inlet of the fourth heat exchanger respectively through water pipes; the outlet of the first heat exchanger is connected to the inlet of the first valve through a water pipe, and when the heat recovery control system enters the waste heat recovery mode, the outlet of the fourth heat exchanger is connected to the inlet of the third heat exchanger through a water pipe, and the outlet of the third heat exchanger is connected to the inlet of the second valve through a water pipe; during the circulation process of the first water pump, the outlet of the first valve and the outlet of the second valve are connected to the inlet of the hot water tank after being combined through a water pipe.

[0115] At the same time, in actual applications, the tail exhaust of multiple fuel cell stacks can be recovered through the expander for kinetic energy recovery, and then recovered through the fourth heat exchanger for heat recovery before being discharged into the external ventilation environment.

[0116] It should be noted here that the controller group may also include multiple other controllers, each used to control the regulation of corresponding drive components in different containers.

[0117] The heat recovery and control device for multiple fuel cell stacks provided in the embodiment of the present application can be used to implement the technical solution in the embodiment of the heat recovery and control method for multiple fuel cell stacks described above in the present application. Its implementation principle and technical effects are similar and will not be repeated here.

[0118] Based on the same inventive concept, an embodiment of the present application further provides a heat recovery control device for a plurality of fuel cells stacked together for implementing the aforementioned heat recovery control method for a plurality of fuel cells stacked together. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of the embodiments of the heat recovery control device for a plurality of fuel cells stacked together provided below can be found in the limitations of the heat recovery control method for a plurality of fuel cells stacked together above, and will not be repeated here.

[0119] In an exemplary embodiment, Figure 6 As shown, a heat recovery control device for a multi-stack fuel cell is provided, comprising: a first control module 31, a second control module 32, a third control module 33 and a fourth control module 34, wherein:

[0120] A first control module 31 is configured to control the rotation speed of the first coolant pump according to the difference between the actual detected temperature of the multiple fuel cell stacks at the current moment and the corresponding critical set temperature;

[0121] A second control module 32 is configured to control the rotation speed of the second coolant pump according to the difference between the actual detected temperature of the coolant inlet of the first heat exchanger at the current moment and the corresponding critical set temperature;

[0122] A third control module 33 is configured to control the rotation speed of the first water pump according to the current inlet temperature of the hot water tank and the actual detected temperatures of the multiple fuel cell stacks;

[0123] The fourth control module 34 is used to control the rotation speed of the second water pump according to the outlet temperature of the hot water tank and the heat demand on the user side.

[0124] The heat recovery and control device for multiple fuel cell stacks provided in the embodiment of the present application can be used to implement the technical solution in the embodiment of the heat recovery and control method for multiple fuel cell stacks described above in the present application. Its implementation principle and technical effects are similar and will not be repeated here.

[0125] In an exemplary embodiment, the heat recovery control device for multiple fuel cell stacks further includes:

[0126] The first determination module is used to determine the critical set temperature of the multiple fuel cell stacks at the current moment according to the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at the current moment and the critical set temperature of the multiple fuel cell stacks at the previous moment.

[0127] The heat recovery and control device for multiple fuel cell stacks provided in the embodiment of the present application can be used to implement the technical solution in the embodiment of the heat recovery and control method for multiple fuel cell stacks described above in the present application. Its implementation principle and technical effects are similar and will not be repeated here.

[0128] In an exemplary embodiment, the first determining module is specifically configured to:

[0129] When the temperature difference is less than the first preset threshold and the critical set temperature of the multiple stacks of fuel cells at the previous moment is greater than or equal to the second preset threshold, or when the temperature difference is greater than or equal to the first preset threshold and less than the third preset threshold, or when the temperature difference is greater than the third preset threshold and the critical set temperature of the multiple stacks of fuel cells at the previous moment is less than or equal to the fourth preset threshold, the critical set temperature of the multiple stacks of fuel cells at the previous moment is determined as the critical set temperature of the multiple stacks of fuel cells at the current moment;

[0130] When the temperature difference is less than the first preset threshold and the critical set temperature of the multiple stacks of fuel cells at the previous moment is less than the second preset threshold, the critical set temperature of the multiple stacks of fuel cells at the previous moment is increased to obtain the critical set temperature of the multiple stacks of fuel cells at the current moment;

[0131] When the temperature difference is greater than the third preset threshold and the critical set temperature of the multiple fuel cell stacks at the previous moment is greater than the fourth preset threshold, the critical set temperature of the multiple fuel cell stacks at the previous moment is adjusted down to obtain the critical set temperature of the multiple fuel cell stacks at the current moment; the first preset threshold, the third preset threshold, the fourth preset threshold and the second preset threshold increase in sequence.

[0132] The heat recovery and control device for multiple fuel cell stacks provided in the embodiment of the present application can be used to implement the technical solution in the embodiment of the heat recovery and control method for multiple fuel cell stacks described above in the present application. Its implementation principle and technical effects are similar and will not be repeated here.

[0133] In an exemplary embodiment, the heat recovery control device for multiple fuel cell stacks further includes:

[0134] The second determining module is used to determine the critical set temperature of the coolant inlet of the first heat exchanger at the current moment according to the cold fluid outlet temperature of the first heat exchanger at the current moment and the preset heat exchange temperature difference range.

[0135] The heat recovery and control device for multiple fuel cell stacks provided in the embodiment of the present application can be used to implement the technical solution in the embodiment of the heat recovery and control method for multiple fuel cell stacks described above in the present application. Its implementation principle and technical effects are similar and will not be repeated here.

[0136] In an exemplary embodiment, the third control module 33 is specifically configured to:

[0137] When the inlet temperature is less than a fifth preset threshold, the speed of the first water pump is regulated according to the difference between the inlet temperature and the fifth preset threshold;

[0138] When the inlet temperature is greater than or equal to the fifth preset threshold and the actual detected temperature is greater than the sixth preset threshold, the rotational speed of the first water pump is regulated according to the difference between the actual detected temperature and the sixth preset threshold.

[0139] The heat recovery and control device for multiple fuel cell stacks provided in the embodiment of the present application can be used to implement the technical solution in the embodiment of the heat recovery and control method for multiple fuel cell stacks described above in the present application. Its implementation principle and technical effects are similar and will not be repeated here.

[0140] In an exemplary embodiment, the fourth control module 34 is specifically configured to:

[0141] When the outlet temperature is less than a seventh preset threshold, the speed of the second water pump is regulated according to the difference between the outlet temperature and the seventh preset threshold;

[0142] When the outlet temperature is greater than or equal to the seventh preset threshold, the rotation speed of the second water pump is regulated according to the difference between the outlet heat of the hot water tank and the heat demand on the user side.

[0143] The heat recovery and control device for multiple fuel cell stacks provided in the embodiment of the present application can be used to implement the technical solution in the embodiment of the heat recovery and control method for multiple fuel cell stacks described above in the present application. Its implementation principle and technical effects are similar and will not be repeated here.

[0144] Each module in the heat recovery control device for multiple fuel cell stacks can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a controller within a computer device in hardware form, or stored in a computer device memory in software form, allowing the controller to call and execute the corresponding operations of each module.

[0145] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 7As shown. The computer device includes a controller, memory, an input / output interface, a communication interface, and an input device. The controller, memory, and input / output interface are connected via a system bus, and the communication interface and input device are connected to the system bus via the input / output interface. The controller of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the controller and external devices. The communication interface of the computer device is used to communicate with external terminals via wired or wireless communication, and the wireless communication can be achieved via Wi-Fi, a mobile cellular network, near-field communication (NFC), or other technologies. When executed by the controller, the computer program implements a method for controlling heat recovery of a multi-stack fuel cell. The input device of the computer device can be a key, trackball, or touchpad provided on the computer device housing, or an external keyboard, touchpad, or mouse.

[0146] Those skilled in the art will understand that Figure 7 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0147] In an exemplary embodiment, a computer device is provided, including a memory and a controller. The memory stores a computer program, and the controller implements the steps of the method in any of the above embodiments when executing the computer program.

[0148] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a controller, the steps of the method in any of the above embodiments are implemented.

[0149] In one embodiment, a computer program product is provided, comprising a computer program, which implements the steps of the method in any one of the above embodiments when executed by a controller.

[0150] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. In particular, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of a non-volatile memory and a volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The databases involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The controllers involved in the various embodiments provided herein may be, but are not limited to, general-purpose processors, central processing units (CPUs), graphics processing units (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic based on quantum computing, artificial intelligence (AI) processors, and the like.

[0151] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0152] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A heat recovery control method for a multi-stack fuel cell, characterized in that: A controller group is applied to a heat recovery control system, the controller group including a first controller, a second controller, a third controller, and a fourth controller. The heat recovery control system also includes a plurality of fuel cell stacks, a first coolant pump, a second coolant pump, a first water pump, a second water pump, a hot water tank, and a first heat exchanger. The method includes: The first controller regulates the rotation speed of the first coolant pump according to the difference between the actual detected temperature of the plurality of fuel cell stacks at a current moment and the corresponding critical set temperature; The second controller regulates the rotation speed of the second coolant pump according to the difference between the actual detected temperature of the coolant inlet of the first heat exchanger at the current moment and the corresponding critical set temperature; The third controller regulates the rotation speed of the first water pump according to the inlet temperature of the hot water tank and the actual detected temperature of the plurality of fuel cell stacks at the current moment; The fourth controller regulates the rotation speed of the second water pump according to the outlet temperature of the hot water tank and the heat demand on the user side.

2. The method according to claim 1, characterized in that Before the first controller regulates the rotation speed of the first coolant pump, the method further includes: The critical set temperature of the multiple fuel cell stacks at the current moment is determined according to the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at the current moment and the critical set temperature of the multiple fuel cell stacks at the previous moment.

3. The method according to claim 2, characterized in that Determining the critical set temperature of the multiple fuel cell stacks at the current moment based on the temperature difference between the coolant inlet and the coolant outlet of the multiple fuel cell stacks at the current moment and the critical set temperature of the multiple fuel cell stacks at the previous moment includes: In a case where the temperature difference is less than a first preset threshold and the critical set temperature of the multiple stacks of fuel cells at the previous moment is greater than or equal to a second preset threshold, or the temperature difference is greater than or equal to the first preset threshold and less than a third preset threshold, or the temperature difference is greater than the third preset threshold and the critical set temperature of the multiple stacks of fuel cells at the previous moment is less than or equal to a fourth preset threshold, the critical set temperature of the multiple stacks of fuel cells at the previous moment is determined as the critical set temperature of the multiple stacks of fuel cells at the current moment; When the temperature difference is less than the first preset threshold and the critical set temperature of the multiple fuel cell stacks at the previous moment is less than the second preset threshold, the critical set temperature of the multiple fuel cell stacks at the previous moment is increased to obtain the critical set temperature of the multiple fuel cell stacks at the current moment; When the temperature difference is greater than the third preset threshold and the critical set temperature of the multiple fuel cell stacks at the previous moment is greater than the fourth preset threshold, the critical set temperature of the multiple fuel cell stacks at the previous moment is adjusted down to obtain the critical set temperature of the multiple fuel cell stacks at the current moment; the first preset threshold, the third preset threshold, the fourth preset threshold and the second preset threshold increase in sequence.

4. The method according to any one of claims 1 to 3, characterized in that Before the second controller regulates the rotation speed of the second coolant pump, the method further includes: The critical set temperature of the coolant inlet of the first heat exchanger at the current moment is determined according to the cold fluid outlet temperature of the first heat exchanger at the current moment and a preset heat exchange temperature difference range.

5. The method according to any one of claims 1 to 3, characterized in that The third controller regulates the rotation speed of the first water pump according to the inlet temperature of the hot water tank and the actual detected temperature of the multiple fuel cell stacks at the current moment, including: When the inlet temperature is less than a fifth preset threshold, regulating the rotation speed of the first water pump according to the difference between the inlet temperature and the fifth preset threshold; When the inlet temperature is greater than or equal to the fifth preset threshold and the actual detected temperature is greater than a sixth preset threshold, the rotational speed of the first water pump is regulated according to the difference between the actual detected temperature and the sixth preset threshold.

6. The method according to any one of claims 1 to 3, characterized in that The fourth controller regulates the speed of the second water pump according to the outlet temperature of the hot water tank and the heat demand on the user side, including: When the outlet temperature is lower than a seventh preset threshold, regulating the rotation speed of the second water pump according to a difference between the outlet temperature and the seventh preset threshold; When the outlet temperature is greater than or equal to the seventh preset threshold, the rotation speed of the second water pump is regulated according to the difference between the outlet heat of the hot water tank and the heat demand at the user side.

7. A heat recovery control device for multiple fuel cell stacks, characterized in that: The device comprises: a first control module, configured to control the rotation speed of the first coolant pump according to a difference between an actual detected temperature of the plurality of fuel cell stacks at a current moment and a corresponding critical set temperature; a second control module, configured to control the rotation speed of the second coolant pump according to a difference between an actual detected temperature of the coolant inlet of the first heat exchanger at the current moment and a corresponding critical set temperature; a third control module, configured to control the rotation speed of the first water pump according to the current inlet temperature of the hot water tank and the actual detected temperatures of the plurality of fuel cell stacks; The fourth control module is used to control the rotation speed of the second water pump according to the outlet temperature of the hot water tank and the heat demand on the user side.

8. A heat recovery control system for multiple fuel cell stacks, characterized in that: The heat recovery control system includes a controller group, multiple fuel cell stacks, a first coolant pump, a second coolant pump, a first water pump, a second water pump, a hot water tank and a first heat exchanger, and the controller group includes a first controller, a second controller, a third controller and a fourth controller; The controller group is used to execute the method according to any one of claims 1 to 6.

9. A computer device comprising a memory and a controller, wherein the memory stores a computer program, wherein: When the controller executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a controller, the steps of the method according to any one of claims 1 to 6 are implemented.

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