Temperature control method and device for multi-electrolyzer hydrogen production system

Abstract

The present invention provides a temperature control method and device for a multi-electrolyzer hydrogen production system, which determines the given electrolyte flow rate corresponding to the electrolyzer according to the input power of the electrolyzer in the hydrogen production system; controls the actual electrolyte flow rate of the electrolyzer according to the given electrolyte flow rate and the actual electrolyte flow rate of the electrolyzer; detects the working temperature of the electrolyzer; divides at least a first target electrolyzer from the electrolyzer according to the working temperature of the electrolyzer; controls the flow rate of the cooling water pipeline in the hydrogen production system based on the given temperature and the working temperature of the first target electrolyzer to control the working temperature of the first target electrolyzer. Thus, the working temperature of the electrolyzer in the hydrogen production system is controlled to ensure that the heat dissipation performance of the electrolyzer and the hydrogen generated by the electrolyzer can meet the requirements.

Description

Technical Field

[0001] The present invention relates to the field of control technology, and in particular to a temperature control method and device for a multi-electrolyzer hydrogen production system. Background Art

[0002] In the variable power hydrogen production scenario using new energy sources such as photovoltaic and wind power, in order to increase the hydrogen production of the hydrogen production system (electrolysis of water hydrogen production system) while reducing the manufacturing cost of the hydrogen production system, multiple electrolyzers of the hydrogen production system usually share a set of gas-liquid separation equipment. Due to the volatility of new energy, multiple electrolyzers do not work at the same input power; therefore, in order to ensure that the heat dissipation performance of the electrolyzer and the hydrogen produced by the electrolyzer can meet the requirements, a method for controlling the temperature of the electrolyzer is urgently needed. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a temperature control method and device for a multi-electrolyzer hydrogen production system to control the temperature of the electrolyzer.

[0004] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0005] A first aspect of an embodiment of the present invention discloses a temperature control method for a multi-electrolyzer hydrogen production system, the method comprising:

[0006] Determine the given electrolyte flow rate corresponding to each electrolytic cell according to the input power of the electrolytic cell in the hydrogen production system, wherein each electrolytic cell in the hydrogen production system shares a set of gas-liquid separation equipment;

[0007] Controlling the actual flow rate of the electrolyte in the electrolytic cell according to the given flow rate of the electrolyte and the actual flow rate of the electrolyte in the electrolytic cell collected in real time;

[0008] Detecting the operating temperature of the electrolytic cell;

[0009] Dividing at least a first target electrolytic cell from the electrolytic cells according to the working temperature of the electrolytic cells, wherein the first target electrolytic cell is the electrolytic cell with the highest working temperature;

[0010] Based on a given temperature and the operating temperature of the first target electrolyzer, the flow rate of the cooling water pipeline in the hydrogen production system is controlled to control the operating temperature of the first target electrolyzer.

[0011] Preferably, after dividing at least a first target electrolytic cell from the electrolytic cell according to the operating temperature of the electrolytic cell, the method further comprises:

[0012] Dividing a second target electrolytic cell from the electrolytic cell, wherein the second target electrolytic cell is the electrolytic cell other than the first target electrolytic cell;

[0013] Based on the preset temperature and the operating temperature of the second target electrolytic cell, the set electrolyte flow rate corresponding to the second target electrolytic cell for controlling the actual electrolyte flow rate is adjusted to control the operating temperature of the second target electrolytic cell.

[0014] Preferably, controlling the actual flow rate of the electrolyte in the electrolytic cell according to the given flow rate of the electrolyte and the actual flow rate of the electrolyte in the electrolytic cell collected in real time comprises:

[0015] Calculating the flow difference between the given flow rate of the electrolyte corresponding to the electrolytic cell and the actual flow rate of the electrolyte collected in real time;

[0016] Inputting the flow difference into a first designated regulator to obtain a first regulating signal;

[0017] According to the first adjustment signal, the electrolyte circulation pump corresponding to the electrolyzer in the hydrogen production system is controlled to control the actual flow rate of the electrolyte in the electrolyzer, and the step of calculating the flow rate difference between the given flow rate of the electrolyte corresponding to the electrolyzer and the actual flow rate of the electrolyte collected in real time is returned.

[0018] Preferably, based on a given temperature and the operating temperature of the first target electrolyzer, controlling the flow rate of the cooling water pipeline in the hydrogen production system to control the operating temperature of the first target electrolyzer comprises:

[0019] Calculating a first temperature difference between a given temperature and an operating temperature of the first target electrolytic cell;

[0020] Inputting the first temperature difference into a second designated regulator to obtain a second regulating signal;

[0021] According to the second adjustment signal, a water pump on the cooling water pipeline in the hydrogen production system is controlled to control the operating temperature of the first target electrolyzer, and the step of calculating the first temperature difference between the given temperature and the operating temperature of the first target electrolyzer is returned to be executed.

[0022] Preferably, based on the preset temperature and the operating temperature of the second target electrolytic cell, adjusting the electrolyte set flow rate corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte to control the operating temperature of the second target electrolytic cell comprises:

[0023] Calculating a second temperature difference between an operating temperature of the second target electrolytic cell and a preset temperature;

[0024] When the second temperature difference is within a preset normal temperature difference range, or when the second temperature difference is greater than an upper limit of the normal temperature difference range, maintaining the given electrolyte flow rate corresponding to the second target electrolytic cell for controlling the actual electrolyte flow rate to control the operating temperature of the second target electrolytic cell, and returning to the step of calculating the second temperature difference between the operating temperature of the second target electrolytic cell and the preset temperature;

[0025] When the second temperature difference is less than the lower limit of the normal temperature difference range, the given flow rate of the electrolyte corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte is reduced by a fixed flow value to control the operating temperature of the second target electrolytic cell, and the process returns to the step of calculating the second temperature difference between the operating temperature of the second target electrolytic cell and the preset temperature.

[0026] Preferably, after dividing the second target electrolytic cell from the electrolytic cell, the method further comprises:

[0027] detecting a new operating temperature of the electrolytic cell;

[0028] Using the new operating temperature of the electrolytic cell, returning to the step of dividing at least a first target electrolytic cell from the electrolytic cell according to the operating temperature of the electrolytic cell; or,

[0029] determining a maximum temperature among new operating temperatures of the electrolytic cell;

[0030] If the electrolytic cell corresponding to the highest temperature is not the first target electrolytic cell, and if the difference between the highest temperature and the new operating temperature of the first target electrolytic cell is greater than the temperature threshold, use the new operating temperature of the electrolytic cell to return to the step of dividing at least the first target electrolytic cell from the electrolytic cell according to the operating temperature of the electrolytic cell.

[0031] Preferably, determining a given flow rate of electrolyte corresponding to each electrolyzer according to the input power of the electrolyzer in the hydrogen production system comprises:

[0032] use Combined with the input power of the electrolyzer in the hydrogen production system, the given flow rate of electrolyte corresponding to each electrolyzer is determined, where F x is the given electrolyte flow rate corresponding to the x-th electrolytic cell, P x is the input power of the x-th electrolytic cell, P0 is the rated power of a single electrolytic cell, and F0 is the electrolyte flow rate required for a single electrolytic cell at the rated power.

[0033] A second aspect of an embodiment of the present invention discloses a temperature control device for a multi-electrolyzer hydrogen production system, the device comprising:

[0034] A determination unit, used to determine a given flow rate of electrolyte corresponding to each electrolyzer according to an input power of the electrolyzer in the hydrogen production system, wherein each electrolyzer in the hydrogen production system shares a set of gas-liquid separation equipment;

[0035] A first control unit, configured to control the actual flow rate of the electrolyte in the electrolytic cell according to the given flow rate of the electrolyte and the actual flow rate of the electrolyte in the electrolytic cell collected in real time;

[0036] A detection unit, used to detect the operating temperature of the electrolytic cell;

[0037] a dividing unit, configured to divide at least a first target electrolytic cell from the electrolytic cell according to the working temperature of the electrolytic cell, wherein the first target electrolytic cell is the electrolytic cell with the highest working temperature;

[0038] The second control unit is used to control the flow rate of the cooling water pipeline in the hydrogen production system based on a given temperature and the operating temperature of the first target electrolyzer, so as to control the operating temperature of the first target electrolyzer.

[0039] Preferably, the dividing unit is further used to: divide a second target electrolytic cell from the electrolytic cell, wherein the second target electrolytic cell is the electrolytic cell other than the first target electrolytic cell;

[0040] Accordingly, the device further comprises:

[0041] The third control unit is used to adjust the given flow rate of the electrolyte corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte based on the preset temperature and the operating temperature of the second target electrolytic cell, so as to control the operating temperature of the second target electrolytic cell.

[0042] Preferably, the first control unit includes:

[0043] A first calculation module, used for calculating the flow difference between the given flow rate of the electrolyte corresponding to the electrolytic cell and the actual flow rate of the electrolyte collected in real time;

[0044] A first input module, used for inputting the flow difference into a first designated regulator to obtain a first regulating signal;

[0045] The first control module is used to control the electrolyte circulation pump corresponding to the electrolyzer in the hydrogen production system according to the first adjustment signal to control the actual flow rate of the electrolyte in the electrolyzer, and return to execute the first calculation module.

[0046] Preferably, the second control unit comprises:

[0047] A second calculation module, used for calculating a first temperature difference between a given temperature and an operating temperature of the first target electrolytic cell;

[0048] A second input module, used for inputting the first temperature difference into a second designated regulator to obtain a second regulating signal;

[0049] The second control module is used to control the water pump on the cooling water pipeline in the hydrogen production system according to the second adjustment signal to control the operating temperature of the first target electrolyzer, and return to execute the second calculation module.

[0050] Preferably, the third control unit includes:

[0051] A third calculation module, used to calculate a second temperature difference between the operating temperature of the second target electrolytic cell and a preset temperature;

[0052] a third control module, configured to maintain the given electrolyte flow rate corresponding to the second target electrolytic cell for controlling the actual electrolyte flow rate when the second temperature difference is within a preset normal temperature difference range, or when the second temperature difference is greater than an upper limit of the normal temperature difference range, so as to control the operating temperature of the second target electrolytic cell, and return to execute the third calculation module;

[0053] The fourth control module is used to reduce the given flow rate of the electrolyte corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte by a fixed flow value when the second temperature difference is less than the lower limit of the normal temperature difference range, so as to control the operating temperature of the second target electrolytic cell, and return to execute the third calculation module.

[0054] Based on the temperature control method and device of a multi-electrolyzer hydrogen production system provided by the above-mentioned embodiment of the present invention, the given electrolyte flow rate corresponding to each electrolyzer is determined according to the input power of the electrolyzer in the hydrogen production system; the actual electrolyte flow rate of the electrolyzer is controlled according to the given electrolyte flow rate and the actual electrolyte flow rate of the electrolyzer collected in real time; the working temperature of the electrolyzer is detected; at least a first target electrolyzer is divided from the electrolyzer according to the working temperature of the electrolyzer; based on the given temperature and the working temperature of the first target electrolyzer, the flow rate of the cooling water pipeline in the hydrogen production system is controlled to control the working temperature of the first target electrolyzer. In this scheme, the given electrolyte flow rate is determined by the input power of the electrolyzer. The actual electrolyte flow rate of the electrolyzer is controlled according to the given electrolyte flow rate. The first target electrolyzer is divided from the electrolyzer based on the working temperature of the electrolyzer. The working temperature of the first target electrolyzer is controlled in a corresponding manner, thereby realizing the control of the working temperature of the electrolyzer in the hydrogen production system to ensure that the heat dissipation performance of the electrolyzer and the hydrogen produced by the electrolyzer can meet the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0056] Figure 1 A schematic diagram of the architecture of a hydrogen production system provided in an embodiment of the present invention;

[0057] Figure 2 A flow chart of a temperature control method for a multi-electrolyzer hydrogen production system provided by an embodiment of the present invention;

[0058] Figure 3 A schematic diagram of a PID regulation loop for controlling the actual flow rate of electrolyte provided in an embodiment of the present invention;

[0059] Figure 4 A schematic diagram of a PID regulation loop for controlling the operating temperature of a first target electrolytic cell provided in an embodiment of the present invention;

[0060] Figure 5 A structural block diagram of a temperature control device for a multi-electrolyzer hydrogen production system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0063] As can be seen from the background technology, due to the volatility of new energy, multiple electrolyzers will not work under the same input power; therefore, in order to make the heat dissipation performance of the electrolyzer and the hydrogen produced by the electrolyzer meet the requirements, a method for controlling the temperature of the electrolyzer is urgently needed.

[0064] Therefore, an embodiment of the present invention provides a temperature control method and device for an electrolyzer hydrogen production system, which uses the input power of the electrolyzer to determine the given flow rate of the electrolyte. The actual flow rate of the electrolyte in the electrolyzer is controlled according to the given flow rate of the electrolyte. A first target electrolyzer is divided from the electrolyzer based on the working temperature of the electrolyzer. The first target electrolyzer is controlled in a corresponding manner, thereby achieving control of the working temperature of the electrolyzer in the hydrogen production system to ensure that the heat dissipation performance of the electrolyzer and the hydrogen generated by the electrolyzer can meet the requirements.

[0065] It should be noted that the inventor has found through research that in the variable power hydrogen production scenario using new energy sources such as photovoltaics and wind power as energy sources, after the gas-liquid mixture output by the electrolyzer of the hydrogen production system enters the gas-liquid separation equipment of the hydrogen production system, there is a certain connection between the gas separation effect and the circulation flow rate of the electrolyte. Generally speaking, when the input energy (that is, the input power) of the electrolyzer is small, the electrolyte will circulate at a small flow rate, and when the input energy of the electrolyzer is large, the circulation flow rate of the electrolyte in the electrolyzer will be increased; through the above-mentioned method, it is possible to take into account the gas-liquid separation effect of the electrolyzer under a smaller input energy, and to ensure the heat dissipation demand of the electrolyzer under a larger input energy, so the electrolyte circulation flow rate of the electrolyzer changes with the change of the input energy of the electrolyzer.

[0066] Based on the research findings of the above inventors, the present invention proposes a temperature control method and device for an electrolyzer hydrogen production system. The temperature control method can control the operating temperature of the electrolyzer in the hydrogen production system to ensure that the heat dissipation performance of the electrolyzer and the hydrogen produced by the electrolyzer can meet the requirements; the specific implementation process of the temperature control method is detailed in the contents of the following embodiments.

[0067] It is worth noting that a temperature control method and device for an electrolyzer hydrogen production system provided in an embodiment of the present invention is applied to a controller; through the scheme provided in an embodiment of the present invention, the temperature of multiple electrolyzers in various types of hydrogen production systems can be controlled, for example: the temperature of multiple electrolyzers in an alkaline water electrolysis hydrogen production system can be controlled, and the temperature of multiple electrolyzers in a PEM water electrolysis hydrogen production system can also be controlled; different types of hydrogen production systems correspond to different electrolytes, such as the electrolyte corresponding to the alkaline water electrolysis hydrogen production system is alkaline solution, and the electrolyte corresponding to the PEM water electrolysis hydrogen production system is pure water. The controller mentioned above can be a programmable logic controller (PLC), or a distributed control system (DCS) controller or other types of controllers.

[0068] To better understand the hydrogen production system involved in the embodiment of the present invention, Figure 1 The schematic diagram of the hydrogen production system is shown as an example. Figure 1The hydrogen production system shown may be an alkaline water electrolysis hydrogen production system.

[0069] like Figure 1 As shown, the hydrogen production system includes: 3 electrolytic cells (electrolytic cell 1 to electrolytic cell 3), a temperature sensor (T001 to T003) of each electrolytic cell, a temperature sensor (T004) arranged on the total alkali solution pipeline, an alkali solution inlet circulation pump (circulation pump A to circulation pump C) and a flow sensor (F001 to F003) of each electrolytic cell, a hydrogen side gas-liquid separator, an oxygen side gas-liquid separator, a heat exchanger, a water pump on the cooling water pipeline (also called a cooling water circulation pump), and a cooling water tower, etc.

[0070] The operating temperature of the electrolytic cell can be detected by temperature sensors T001 to T003, and the actual flow rate of the electrolyte in the electrolytic cell can be collected by flow sensors F001 to F003.

[0071] It should be noted that the hydrogen production system may include multiple (2 or more) electrolyzers. The temperature sensor may be set on the oxygen side outlet pipeline of the electrolyzer, and the temperature sensor may also be set on the hydrogen side outlet pipeline of the electrolyzer. For the circulating pump used to adjust the actual flow rate of the electrolyte in the electrolyzer, a regulating valve may be used instead of the circulating pump. When a regulating valve is used to replace the circulating pump, it is only necessary to add a total circulating pump to the main pipe at the inlet end of the heat exchanger. The above Figure 1 The architecture of the hydrogen production system is only used for illustration and is not intended to limit the hydrogen production system.

[0072] See also Figure 2 , shows a flow chart of a temperature control method for a multi-electrolyzer hydrogen production system provided by an embodiment of the present invention, the temperature control method comprising:

[0073] Step S201: determining a given electrolyte flow rate corresponding to each electrolyzer according to the input power of the electrolyzer in the hydrogen production system.

[0074] It should be noted that each electrolyzer in the hydrogen production system shares a set of gas-liquid separation equipment. For the specific content of the hydrogen production system, please refer to the above embodiment of the present invention. Figure 1 The relevant description will not be repeated here.

[0075] In the specific implementation of step S201, for each electrolyzer in the hydrogen production system, the input power of the electrolyzer (collected by the controller) is used to determine the given flow rate of the electrolyte corresponding to the electrolyzer.

[0076] Specifically, for each electrolyzer in the hydrogen production system, the given electrolyte flow rate corresponding to the electrolyzer is determined by using formula (1) in combination with the input power of the electrolyzer.

[0077]

[0078] In formula (1), F x is the given electrolyte flow rate corresponding to the xth electrolytic cell, P x is the input power of the xth electrolytic cell, P0 is the rated power of a single electrolytic cell, and F0 is the electrolyte flow rate required for a single electrolytic cell at the rated power.

[0079] Through the above method, the given electrolyte flow rate corresponding to each electrolytic cell can be determined respectively.

[0080] It should be noted that in the variable power hydrogen production scenario using new energy such as photovoltaic and wind power as energy sources, the input power of the electrolyzer may change due to the volatility of new energy; in some embodiments, the input power of each electrolyzer is monitored; when it is monitored that the input power of any electrolyzer changes (the amplitude of the change is greater than the preset amplitude), the corresponding electrolyte given flow rate of any electrolyzer is re-determined based on the changed input power of the arbitrary electrolyzer; the method for determining the given flow rate of the electrolyte is detailed in the above content and will not be repeated here.

[0081] That is to say, after determining the given electrolyte flow rate corresponding to each electrolytic cell, if the input power of a certain electrolytic cell changes, it is necessary to recalculate the given electrolyte flow rate of the electrolytic cell whose input power has changed.

[0082] Step S202: controlling the actual flow rate of the electrolyte in the electrolytic cell according to the given flow rate of the electrolyte and the actual flow rate of the electrolyte in the electrolytic cell collected in real time.

[0083] In some embodiments, the actual flow rate of the electrolyte in each electrolytic cell is collected in real time through the flow sensor corresponding to each electrolytic cell.

[0084] In the process of specifically implementing step S202, for each electrolyzer in the hydrogen production system, the actual flow rate of the electrolyte in the electrolyzer is controlled according to the given flow rate of the electrolyte in the electrolyzer and the actual flow rate of the electrolyte in the electrolyzer, so that the actual flow rate of the electrolyte in the electrolyzer is equal to the given flow rate of the electrolyte in the electrolyzer; it should be noted that when the difference between the actual flow rate of the electrolyte in the electrolyzer and the given flow rate of the electrolyte is within a certain range, it can be characterized that the actual flow rate of the electrolyte is equal to the given flow rate of the electrolyte.

[0085] Specifically, for each electrolyzer in the hydrogen production system, the flow difference between the given electrolyte flow corresponding to the electrolyzer and the actual electrolyte flow collected in real time is calculated; the flow difference is input into the first designated regulator to obtain a first adjustment signal; according to the first adjustment signal, the electrolyte circulation pump corresponding to the electrolyzer in the hydrogen production system is controlled to control the actual electrolyte flow of the electrolyzer, and the above step of "calculating the flow difference between the given electrolyte flow corresponding to the electrolyzer and the actual electrolyte flow collected in real time" is returned to execute. The actual electrolyte flow of each electrolyzer is controlled in the above manner. It should be noted that in the process of controlling the actual electrolyte flow of the electrolyzer, the actual electrolyte flow of the electrolyzer is also continuously collected.

[0086] In some embodiments, the first designated regulator may be a PID (proportional, integral and differential) regulator, that is, based on the given flow rate of the electrolyte in the electrolytic cell and the actual flow rate of the electrolyte, PID control is performed on the actual flow rate of the electrolyte in the electrolytic cell so that the actual flow rate of the electrolyte in the electrolytic cell is equal to the given flow rate of the electrolyte in the electrolytic cell; similarly, the first designated regulator may also be other regulators with control and regulation functions, and the type of the first designated regulator is not limited in the embodiments of the present invention.

[0087] In order to better explain how to control the actual flow rate of the electrolyte in the electrolytic cell, the first designated regulator is a PID regulator as an example. Figure 3 The schematic diagram of the PID regulation loop for controlling the actual flow rate of the electrolyte is shown, and an example is given to illustrate the process of controlling the actual flow rate of the electrolyte in the electrolytic cell.

[0088] See also Figure 3 The content in F x is the electrolyte given flow rate of the xth electrolytic cell (equivalent to the command signal in the PID regulation loop), F t is the actual flow rate of electrolyte in the xth electrolytic cell; calculate F x and F t The flow difference between the two is input into the PID regulator to obtain a first adjustment signal, and the electrolyte flow of the electrolyte circulation pump corresponding to the x-th electrolytic cell is controlled according to the first adjustment signal, thereby controlling the actual electrolyte flow of the x-th electrolytic cell. In the specific control process, when F t Greater than F x When F is , according to the first adjustment signal output by the PID regulator, the electrolyte flow rate of the electrolyte circulation pump corresponding to the x-th electrolytic cell is reduced, thereby reducing the actual electrolyte flow rate of the x-th electrolytic cell; t Less than F xWhen the PID regulator outputs the first regulation signal, the electrolyte flow rate of the electrolyte circulation pump corresponding to the x-th electrolytic cell is increased, thereby increasing the actual electrolyte flow rate of the x-th electrolytic cell; when the PID regulation enters a steady state, F t Equal to F x , or F t and F x The difference between them is within a certain range.

[0089] Step S203: Detect the operating temperature of the electrolytic cell.

[0090] In the specific implementation of step S203, the operating temperature of each electrolytic cell in the hydrogen production system is detected by using the temperature sensor corresponding to each electrolytic cell.

[0091] Step S204: at least a first target electrolytic cell is divided from the electrolytic cells according to the operating temperature of the electrolytic cells.

[0092] It should be noted that the first target electrolytic cell is the electrolytic cell with the highest operating temperature.

[0093] In the specific implementation of step S204, after the operating temperature of each electrolytic cell is detected, the operating temperature of each electrolytic cell is compared to divide at least a first target electrolytic cell from all the electrolytic cells. Specifically, the electrolytic cell with the highest operating temperature is determined as the first target electrolytic cell.

[0094] Preferably, in some embodiments, after the first target electrolytic cell is determined, a second target electrolytic cell is further divided from each electrolytic cell, wherein the second target electrolytic cell is the electrolytic cell other than the first target electrolytic cell.

[0095] That is, after comparing the operating temperatures of the various electrolytic cells, the electrolytic cell with the highest operating temperature is determined as the first target electrolytic cell, and the electrolytic cells other than the first target electrolytic cell are determined as the second target electrolytic cells.

[0096] For example, suppose the hydrogen production system includes three electrolyzers, namely electrolyzer 1, electrolyzer 2 and electrolyzer 3; after detecting the working temperature of each electrolyzer, if the working temperature of electrolyzer 1 is the highest, then electrolyzer 1 is the first target electrolyzer, and electrolyzer 2 and electrolyzer 3 are the second target electrolyzers.

[0097] It can be understood that in the process of controlling the operating temperatures of the first target electrolytic cell and the second target electrolytic cell, the operating temperatures of each electrolytic cell are periodically collected. Each time the operating temperature of the electrolytic cell is collected, the newly collected operating temperature is used to determine whether it is necessary to re-divide the first target electrolytic cell and the second target electrolytic cell.

[0098] In some embodiments, after the electrolytic cell is divided into a first target electrolytic cell and a second target electrolytic cell, a new operating temperature of the electrolytic cell is detected; using the new operating temperature of the electrolytic cell, returning to step S204 to use the new operating temperature to re-divide at least the first target electrolytic cell from the electrolytic cell (equivalent to re-dividing the first target electrolytic cell and the second target electrolytic cell); or, determining the highest temperature among the new operating temperatures of the electrolytic cell; if the electrolytic cell corresponding to the highest temperature is not the first target electrolytic cell (the first target electrolytic cell obtained by the last division), and if the difference between the highest temperature and the new operating temperature of the first target electrolytic cell is greater than a temperature threshold (such as 5°C), using the new operating temperature of the electrolytic cell, returning to step S204 to use the new operating temperature to re-divide at least the first target electrolytic cell from the electrolytic cell.

[0099] If the electrolytic cell corresponding to the highest temperature is the first target electrolytic cell, or if the difference between the highest temperature and the new operating temperature of the first target electrolytic cell is not greater than the temperature threshold, there is no need to re-divide at least the first target electrolytic cell from the electrolytic cell (i.e., there is no need to re-divide the first target electrolytic cell and the second target electrolytic cell).

[0100] That is to say, after detecting the new operating temperature of the electrolytic cell, the new operating temperature can be directly used to re-divide the first target electrolytic cell and the second target electrolytic cell; or the highest temperature among the new operating temperatures can be compared with the new operating temperature of the first target electrolytic cell, and then it can be determined whether the first target electrolytic cell and the second target electrolytic cell need to be re-divided according to the comparison results.

[0101] For example, suppose the hydrogen production system includes three electrolyzers, namely electrolyzer 1, electrolyzer 2 and electrolyzer 3; and the current first target electrolyzer is electrolyzer 1. After re-detecting and obtaining the new operating temperatures of each electrolyzer, suppose that the operating temperature of electrolyzer 2 is the highest among the new operating temperatures. At this time, there are two ways to re-divide the first target electrolyzer and the second target electrolyzer.

[0102] The first method is to directly use the new working temperature to re-divide the first target electrolytic cell and the second target electrolytic cell. After the re-division, electrolytic cell 2 replaces electrolytic cell 1 to become the first target electrolytic cell, and electrolytic cell 1 and electrolytic cell 3 are the second target electrolytic cells.

[0103] The second method: calculate the difference between the new operating temperature of electrolytic cell 2 and the new operating temperature of electrolytic cell 1, the difference = new operating temperature of electrolytic cell 2 - new operating temperature of electrolytic cell 1; if the difference is greater than 5°C, use the new operating temperature to re-divide the first target electrolytic cell and the second target electrolytic cell. After re-division, electrolytic cell 2 replaces electrolytic cell 1 to become the first target electrolytic cell, and electrolytic cell 1 and electrolytic cell 3 are the second target electrolytic cells; if the difference is not greater than 5°C, do not re-divide the first target electrolytic cell and the second target electrolytic cell. At this time, electrolytic cell 1 is still the first target electrolytic cell, and electrolytic cell 2 and electrolytic cell 3 are still the second target electrolytic cells.

[0104] Through the above method, multiple electrolytic cells can be divided into first target electrolytic cells and second target electrolytic cells; for the first target electrolytic cell, step S205 is executed to control the operating temperature of the first target electrolytic cell; for each second target electrolytic cell, the operating temperature of the second target electrolytic cell is controlled in a corresponding manner.

[0105] It should be noted that in the process of controlling the operating temperatures of the first target electrolytic cell and the second target electrolytic cell, the new operating temperatures of each electrolytic cell are also detected; after each new operating temperature of each electrolytic cell is detected, the first target electrolytic cell and the second target electrolytic cell can be determined in the above manner, and the specific determination method will not be repeated here.

[0106] Step S205: Based on the given temperature and the operating temperature of the first target electrolyzer, the flow rate of the cooling water pipeline in the hydrogen production system is controlled to control the operating temperature of the first target electrolyzer.

[0107] In some embodiments, after dividing the first target electrolytic cell and the second target electrolytic cell, for the first target electrolytic cell, the actual flow rate of the electrolyte of the first target electrolytic cell continues to be controlled in the manner of step S202 (the given flow rate of the electrolyte of the first target electrolytic cell maintains the current value).

[0108] In the specific implementation of step S205, the first temperature difference between the given temperature and the operating temperature of the first target electrolyzer is calculated; the first temperature difference is input into the second designated regulator to obtain a second adjustment signal; according to the second adjustment signal, the water pump on the cooling water pipeline of the hydrogen production system is controlled (equivalent to controlling the flow of the cooling water pipeline) to control the operating temperature of the first target electrolyzer, and the above-mentioned step of "calculating the first temperature difference between the given temperature and the operating temperature of the first target electrolyzer" is returned to be executed. It should be noted that in the process of controlling the operating temperature of the first target electrolyzer, the operating temperature of the first target electrolyzer is also detected.

[0109] In some embodiments, the second designated regulator can be a PID regulator, that is, based on the given temperature and the operating temperature of the first target electrolyzer, the flow rate of the water pump in the cooling water pipeline of the hydrogen production system (also referred to as the cooling water flow rate) is PID controlled, thereby controlling the temperature of the total electrolyte, and ultimately achieving the purpose of controlling the operating temperature of the first target electrolyzer, so that the operating temperature of the first target electrolyzer is equal to the given temperature. It should be noted that when the first temperature difference between the operating temperature of the first target electrolyzer and the given temperature is within a certain range, it can be characterized that the operating temperature of the first target electrolyzer is equal to the given temperature.

[0110] To better explain how to control the working temperature of the first target electrolytic cell, take the second designated regulator as a PID regulator as an example, combined with Figure 4 The schematic diagram of the PID regulation loop for controlling the operating temperature of the first target electrolytic cell is shown, and the process of controlling the operating temperature of the first target electrolytic cell is illustrated.

[0111] See also Figure 4 In the content, Tmax is the operating temperature of the first target electrolytic cell, and Tref is the given temperature; the first temperature difference between Tref and Tmax is calculated, and the first temperature difference is input into the PID regulator to obtain the second adjustment signal (denoted as D r1 ); According to the second adjustment signal, the cooling water flow rate of the water pump on the cooling water pipeline is controlled, thereby controlling the operating temperature of the first target electrolytic cell. In the specific control process, when Tmax is greater than Tref, the D output by the PID regulator r1 Increase, through the D r1 Increase the cooling water flow of the water pump, thereby reducing the temperature of the total electrolyte, and ultimately achieve the purpose of reducing the operating temperature of the first target electrolytic cell; when Tmax is less than Tref, the D output of the PID regulator r1 Reduced by this D r1 Reduce the cooling water flow of the water pump, thereby increasing the temperature of the total electrolyte, and ultimately achieve the purpose of increasing the operating temperature of the first target electrolytic cell; when the PID adjustment enters a steady state, Tmax is equal to Tref, or in other words, the first temperature difference between Tref and Tmax is within a certain range.

[0112] Through the above control method, the operating temperature of the first target electrolytic cell can be controlled near a given temperature.

[0113] In some embodiments, for each second target electrolytic cell, a specific method for controlling the operating temperature of the second target electrolytic cell is as follows: based on a preset temperature and the operating temperature of the second target electrolytic cell, adjusting a given flow rate of the electrolyte corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte to control the operating temperature of the second target electrolytic cell.

[0114] It can be seen from the content of the above step S202 that the actual flow rate of the electrolyte of the electrolytic cell is controlled according to the given flow rate of the electrolyte of the electrolytic cell; in the process of controlling the working temperature of the second target electrolytic cell, the working temperature of the second target electrolytic cell is required to adjust the given flow rate of the electrolyte corresponding to the second target electrolytic cell, and then adjust the actual flow rate of the electrolyte of the second target electrolytic cell, so as to finally achieve the purpose of controlling the working temperature of the second target electrolytic cell.

[0115] In a specific implementation, for each second target electrolytic cell, the second temperature difference between the working temperature of the second target electrolytic cell and the preset temperature is calculated. When the second temperature difference is within the preset normal temperature difference range (such as the range of -2°C to 2°C), or when the second temperature difference is greater than the upper limit of the normal temperature difference range, the electrolyte set flow rate corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte is maintained to control the working temperature of the second target electrolytic cell, and the step of "calculating the second temperature difference between the working temperature of the second target electrolytic cell and the preset temperature" is returned to be executed; when the second temperature difference is less than the lower limit of the normal temperature difference range, the electrolyte set flow rate corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte is reduced by a fixed flow value to control the working temperature of the second target electrolytic cell, and the step of "calculating the second temperature difference between the working temperature of the second target electrolytic cell and the preset temperature" is returned to be executed.

[0116] That is to say, for each second target electrolytic cell, the second temperature difference between the working temperature of the second target electrolytic cell and the preset temperature is calculated; if the second temperature difference is within the normal temperature difference range (equivalent to the working temperature being close to the preset temperature), or if the second temperature difference is greater than the upper limit of the normal temperature difference range (equivalent to the working temperature being greater than the preset temperature), the electrolyte given flow rate corresponding to the second target electrolytic cell is maintained at this time, and the current electrolyte given flow rate is continued to control the electrolyte actual flow rate of the second target electrolytic cell, and the working temperature of the second target electrolytic cell is controlled (maintained or reduced) near the preset temperature to achieve the purpose of controlling the working temperature of the second target electrolytic cell. If the second temperature difference is less than the lower limit of the normal temperature difference range (equivalent to the working temperature being less than the preset temperature), the electrolyte given flow rate corresponding to the second target electrolytic cell is reduced by a fixed flow rate value, and the electrolyte given flow rate after reducing the fixed flow rate value is used to control the electrolyte actual flow rate of the second target electrolytic cell, and the working temperature of the second target electrolytic cell is increased to near the preset temperature to achieve the purpose of controlling the working temperature of the second target electrolytic cell.

[0117] After the given electrolyte flow rate corresponding to the second target electrolytic cell is reduced by a fixed flow rate value, if the recalculated second temperature difference is still less than the lower limit of the normal temperature difference range, the given electrolyte flow rate corresponding to the second target electrolytic cell continues to be reduced (the fixed flow rate value is reduced each time) until the second temperature difference is within the preset normal temperature difference range.

[0118] For example: let electrolytic cell 2 be the second target electrolytic cell, F2 be the given flow rate of electrolyte in electrolytic cell 2, the normal temperature difference range be [-2℃, 2℃], △F be the fixed flow rate value; calculate the second temperature difference between the working temperature of electrolytic cell 2 and the preset temperature; if the second temperature difference is within [-2℃, 2℃], keep F2 unchanged, that is, still use the current F2 to control the actual flow rate of electrolyte in electrolytic cell 2, and then control the working temperature of electrolytic cell 2. If the second temperature difference is less than -2℃, it is equivalent to the working temperature of electrolytic cell 2 being less than the preset temperature, at this time F2=F2-△F, and use F2 after reducing △F to control the actual flow rate of electrolyte in electrolytic cell 2, and then control the working temperature of electrolytic cell 2. Since the operating temperature of electrolytic cell 2 changes slowly, after F2 is reduced, if the recalculated second temperature difference is still less than -2°C, F2 will continue to be reduced by △F until the second temperature difference is within [-2°C, 2°C]. At this time, the operating temperature of electrolytic cell 2 is more appropriate, and the current actual flow rate of electrolyte in electrolytic cell 2 is maintained.

[0119] By the above method, the operating temperature of each second target electrolytic cell is controlled respectively, so that the operating temperature of the second target electrolytic cell is controlled near the preset temperature.

[0120] It should be noted that the above method for controlling the actual flow rate of the electrolyte in the electrolytic cell according to the given flow rate of the electrolyte can be found in the above step S202 and will not be repeated here.

[0121] In an embodiment of the present invention, the input power of the electrolyzer is used to determine the given flow rate of the electrolyte. The actual flow rate of the electrolyte of the electrolyzer is controlled according to the given flow rate of the electrolyte. The electrolyzer is divided into a first target electrolyzer and a second target electrolyzer based on the working temperature of the electrolyzer. For the first target electrolyzer and the second target electrolyzer, the working temperatures of the first target electrolyzer and the second target electrolyzer are controlled in corresponding ways, respectively, so as to control the working temperature of each electrolyzer in the hydrogen production system, so as to ensure that the heat dissipation performance of the electrolyzer and the hydrogen generated by the electrolyzer can meet the requirements.

[0122] It should be noted that, with respect to the prior art, the existing hydrogen production system comprises a plurality of electrolytic cells and post-processing equipment, and the post-processing equipment consists of a first electrolyte inflow branch (for introducing cold electrolyte into the electrolytic cell) and a second electrolyte inflow branch (for introducing hot electrolyte into the electrolytic cell); when controlling the temperature of the electrolytic cell, the prior art determines the highest operating temperature from the operating temperatures of each electrolytic cell, uses the highest operating temperature to adjust the electrolyte, and uses other non-highest operating temperatures to adjust the flow rate of the cold electrolyte; in short, the prior art adjusts the first electrolyte inflow branch and the second electrolyte inflow branch, and the electrolyte flow rate in the total pipeline returning to the electrolytic cell remains unchanged.

[0123] In combination with the contents of the above-mentioned embodiments, it can be seen that, compared with the prior art, the present scheme controls the actual flow rate of the electrolyte of each electrolyzer according to the given flow rate of the electrolyte; for the first target electrolyzer with the highest operating temperature, on the basis of controlling the actual flow rate of the electrolyte of the first target electrolyzer according to the given flow rate of the electrolyte, the working temperature of the first target electrolyzer is also used to control the flow rate of the cooling water pipeline in the hydrogen production system, thereby controlling the working temperature of the first target electrolyzer to a given temperature; for the second target electrolyzer, in the process of controlling the actual flow rate of the electrolyte of the second target electrolyzer according to the given flow rate of the electrolyte, the given flow rate of the electrolyte corresponding to the second target electrolyzer is adjusted according to the working temperature of the second target electrolyzer, thereby controlling the working temperature of the second target electrolyzer to a preset temperature.

[0124] It can be seen that the way in which the present scheme controls the working temperature of each electrolytic cell is obviously different from the prior art, and for the first target electrolytic cell and the second target electrolytic cell, the present scheme adopts corresponding methods to control the working temperatures of the first target electrolytic cell and the second target electrolytic cell respectively, which can control the working temperature of each electrolytic cell separately and in detail, and the temperature control effect is better than the prior art.

[0125] Corresponding to the temperature control method of a multi-electrolyzer hydrogen production system provided in the above embodiment of the present invention, see Figure 5 , the embodiment of the present invention also provides a structural block diagram of a temperature control device for a multi-electrolyzer hydrogen production system, the temperature control device comprising: a determination unit 501, a first control unit 502, a detection unit 503, a division unit 504 and a second control unit 505;

[0126] The determination unit 501 is used to determine the given electrolyte flow rate corresponding to each electrolyzer according to the input power of the electrolyzer in the hydrogen production system, wherein each electrolyzer in the hydrogen production system shares a set of gas-liquid separation equipment.

[0127] In a specific implementation, the determination unit 501 is specifically used to: use the above formula (1) in combination with the input power of the electrolyzer in the hydrogen production system to determine the given flow rate of the electrolyte corresponding to each electrolyzer.

[0128] The first control unit 502 is used to control the actual flow rate of the electrolyte in the electrolytic cell according to the given flow rate of the electrolyte and the actual flow rate of the electrolyte in the electrolytic cell collected in real time.

[0129] The detection unit 503 is used to detect the working temperature of the electrolytic cell.

[0130] The dividing unit 504 is used to divide at least a first target electrolytic cell from the electrolytic cells according to the working temperature of the electrolytic cells, wherein the first target electrolytic cell is the electrolytic cell with the highest working temperature.

[0131] The second control unit 505 is used to control the flow rate of the cooling water pipeline in the hydrogen production system based on the given temperature and the operating temperature of the first target electrolyzer, so as to control the operating temperature of the first target electrolyzer.

[0132] In an embodiment of the present invention, the input power of the electrolyzer is used to determine the given flow rate of the electrolyte. The actual flow rate of the electrolyte of the electrolyzer is controlled according to the given flow rate of the electrolyte. At least a first target electrolyzer is divided from the electrolyzer based on the working temperature of the electrolyzer. The working temperature of the first target electrolyzer is controlled in a corresponding manner, thereby achieving control of the working temperature of the electrolyzer in the hydrogen production system to ensure that the heat dissipation performance of the electrolyzer and the hydrogen generated by the electrolyzer can meet the requirements.

[0133] Preferably, combined Figure 5 The content shown in the figure, the dividing unit 504 is also used to: divide a second target electrolytic cell from the electrolytic cell, wherein the second target electrolytic cell is an electrolytic cell other than the first target electrolytic cell; accordingly, the temperature control device also includes:

[0134] The third control unit is used to adjust the given flow rate of electrolyte corresponding to the second target electrolytic cell for controlling the actual flow rate of electrolyte based on the preset temperature and the operating temperature of the second target electrolytic cell, so as to control the operating temperature of the second target electrolytic cell.

[0135] Preferably, in combination with the above content, the third control unit includes: a third calculation module, a third control module and a fourth control module; the execution principle of each module is as follows:

[0136] The third calculation module is used to calculate a second temperature difference between the operating temperature of the second target electrolytic cell and the preset temperature.

[0137] The third control module is used to maintain the given electrolyte flow rate corresponding to the second target electrolytic cell for controlling the actual electrolyte flow rate when the second temperature difference is within a preset normal temperature difference range, or when the second temperature difference is greater than the upper limit of the normal temperature difference range, so as to control the operating temperature of the second target electrolytic cell and return to execute the third calculation module.

[0138] The fourth control module is used to reduce the given flow rate of the electrolyte corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte by a fixed flow value when the second temperature difference is less than the lower limit of the normal temperature difference range, so as to control the operating temperature of the second target electrolytic cell, and return to execute the third calculation module.

[0139] In an embodiment of the present invention, the electrolyzer is divided into a first target electrolyzer and a second target electrolyzer based on the working temperature of the electrolyzer. For the first target electrolyzer and the second target electrolyzer, the working temperatures of the first target electrolyzer and the second target electrolyzer are controlled in corresponding ways, thereby controlling the working temperature of each electrolyzer in the hydrogen production system to ensure that the heat dissipation performance of the electrolyzer and the hydrogen generated by the electrolyzer can meet the requirements.

[0140] Preferably, combined Figure 5 As shown in the figure, the first control unit 502 includes: a first calculation module, a first input module and a first control module; the execution principle of each module is as follows:

[0141] The first calculation module is used to calculate the flow difference between the given flow of the electrolyte corresponding to the electrolytic cell and the actual flow of the electrolyte collected in real time.

[0142] The first input module is used to input the flow difference into a first designated regulator to obtain a first regulating signal.

[0143] The first control module is used to control the electrolyte circulation pump corresponding to the electrolyzer in the hydrogen production system according to the first adjustment signal to control the actual flow rate of the electrolyte in the electrolyzer, and return to execute the first calculation module.

[0144] Preferably, combined Figure 5 The second control unit 505 includes: a second calculation module, a second input module and a second control module; the execution principle of each module is as follows:

[0145] The second calculation module is used to calculate a first temperature difference between a given temperature and a first target operating temperature of the electrolytic cell.

[0146] The second input module is used to input the first temperature difference into the second designated regulator to obtain a second regulating signal.

[0147] The second control module is used to control the water pump on the cooling water pipeline in the hydrogen production system according to the second adjustment signal to control the operating temperature of the first target electrolyzer, and return to execute the second calculation module.

[0148] Preferably, combined Figure 5 The detection unit 503 is also used to detect the new working temperature of the electrolytic cell; accordingly, the temperature control device also includes:

[0149] A processing unit is used to use the new operating temperature of the electrolytic cell to return to the execution division unit 504; or, determine the highest temperature among the new operating temperatures of the electrolytic cell; if the electrolytic cell corresponding to the highest temperature is not the first target electrolytic cell, and if the difference between the highest temperature and the new operating temperature of the first target electrolytic cell is greater than the temperature threshold, use the new operating temperature of the electrolytic cell to return to the execution division unit 504.

[0150] In summary, an embodiment of the present invention provides a temperature control method and device for a multi-electrolyzer hydrogen production system, which uses the input power of the electrolyzer to determine the given flow rate of the electrolyte. The actual flow rate of the electrolyte in the electrolyzer is controlled according to the given flow rate of the electrolyte. The electrolyzer is divided into a first target electrolyzer and a second target electrolyzer based on the working temperature of the electrolyzer. For the first target electrolyzer and the second target electrolyzer, the working temperatures of the first target electrolyzer and the second target electrolyzer are controlled in corresponding ways, respectively, so as to control the working temperature of each electrolyzer in the hydrogen production system to ensure that the heat dissipation performance of the electrolyzer and the hydrogen produced by the electrolyzer can meet the requirements.

[0151] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0152] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0153] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A temperature control method for a multi-electrolyzer hydrogen production system, characterized in that: The method comprises: Determine the given electrolyte flow rate corresponding to each electrolytic cell according to the input power of the electrolytic cell in the hydrogen production system, wherein each electrolytic cell in the hydrogen production system shares a set of gas-liquid separation equipment; Controlling the actual flow rate of the electrolyte in the electrolytic cell according to the given flow rate of the electrolyte and the actual flow rate of the electrolyte in the electrolytic cell collected in real time; Detecting the operating temperature of the electrolytic cell; Dividing at least a first target electrolytic cell from the electrolytic cells according to the working temperature of the electrolytic cells, wherein the first target electrolytic cell is the electrolytic cell with the highest working temperature; Based on a given temperature and the operating temperature of the first target electrolyzer, the flow rate of the cooling water pipeline in the hydrogen production system is controlled to control the operating temperature of the first target electrolyzer.

2. The method according to claim 1, characterized in that After dividing at least a first target electrolytic cell from the electrolytic cell according to the operating temperature of the electrolytic cell, the method further includes: Dividing a second target electrolytic cell from the electrolytic cell, wherein the second target electrolytic cell is the electrolytic cell other than the first target electrolytic cell; Based on the preset temperature and the operating temperature of the second target electrolytic cell, the set electrolyte flow rate corresponding to the second target electrolytic cell for controlling the actual electrolyte flow rate is adjusted to control the operating temperature of the second target electrolytic cell.

3. The method according to claim 1, characterized in that According to the given flow rate of the electrolyte and the actual flow rate of the electrolyte in the electrolytic cell collected in real time, controlling the actual flow rate of the electrolyte in the electrolytic cell comprises: Calculating the flow difference between the given flow rate of the electrolyte corresponding to the electrolytic cell and the actual flow rate of the electrolyte collected in real time; Inputting the flow difference into a first designated regulator to obtain a first regulating signal; According to the first adjustment signal, the electrolyte circulation pump corresponding to the electrolyzer in the hydrogen production system is controlled to control the actual flow rate of the electrolyte in the electrolyzer, and the step of calculating the flow rate difference between the given flow rate of the electrolyte corresponding to the electrolyzer and the actual flow rate of the electrolyte collected in real time is returned.

4. The method according to claim 1, characterized in that: Based on a given temperature and the operating temperature of the first target electrolyzer, controlling the flow rate of the cooling water pipeline in the hydrogen production system to control the operating temperature of the first target electrolyzer includes: Calculating a first temperature difference between a given temperature and an operating temperature of the first target electrolytic cell; Inputting the first temperature difference into a second designated regulator to obtain a second regulating signal; According to the second adjustment signal, a water pump on the cooling water pipeline in the hydrogen production system is controlled to control the operating temperature of the first target electrolyzer, and the step of calculating the first temperature difference between the given temperature and the operating temperature of the first target electrolyzer is returned to be executed.

5. The method according to claim 2, characterized in that: Based on the preset temperature and the operating temperature of the second target electrolytic cell, adjusting the electrolyte set flow rate corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte to control the operating temperature of the second target electrolytic cell, including: Calculating a second temperature difference between an operating temperature of the second target electrolytic cell and a preset temperature; When the second temperature difference is within a preset normal temperature difference range, or when the second temperature difference is greater than an upper limit of the normal temperature difference range, maintaining the given electrolyte flow rate corresponding to the second target electrolytic cell for controlling the actual electrolyte flow rate to control the operating temperature of the second target electrolytic cell, and returning to the step of calculating the second temperature difference between the operating temperature of the second target electrolytic cell and the preset temperature; When the second temperature difference is less than the lower limit of the normal temperature difference range, the given flow rate of the electrolyte corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte is reduced by a fixed flow value to control the operating temperature of the second target electrolytic cell, and the process returns to the step of calculating the second temperature difference between the operating temperature of the second target electrolytic cell and the preset temperature.

6. The method according to claim 2, characterized in that After dividing a second target electrolytic cell from the electrolytic cell, the method further includes: detecting a new operating temperature of the electrolytic cell; Using the new operating temperature of the electrolytic cell, returning to the step of dividing at least a first target electrolytic cell from the electrolytic cell according to the operating temperature of the electrolytic cell; or, determining a maximum temperature among new operating temperatures of the electrolytic cell; If the electrolytic cell corresponding to the highest temperature is not the first target electrolytic cell, and if the difference between the highest temperature and the new operating temperature of the first target electrolytic cell is greater than the temperature threshold, use the new operating temperature of the electrolytic cell to return to the step of dividing at least the first target electrolytic cell from the electrolytic cell according to the operating temperature of the electrolytic cell.

7. The method according to claim 1, characterized in that Determining a given electrolyte flow rate corresponding to each electrolyzer according to the input power of the electrolyzer in the hydrogen production system includes: use Combined with the input power of the electrolyzer in the hydrogen production system, the given flow rate of electrolyte corresponding to each electrolyzer is determined, where F x is the given electrolyte flow rate corresponding to the x-th electrolytic cell, P x is the input power of the x-th electrolytic cell, P0 is the rated power of a single electrolytic cell, and F0 is the electrolyte flow rate required for a single electrolytic cell at the rated power.

8. A temperature control device for a multi-electrolyzer hydrogen production system, characterized in that: The device comprises: A determination unit, used to determine a given flow rate of electrolyte corresponding to each electrolyzer according to an input power of the electrolyzer in the hydrogen production system, wherein each electrolyzer in the hydrogen production system shares a set of gas-liquid separation equipment; A first control unit, configured to control the actual flow rate of the electrolyte in the electrolytic cell according to the given flow rate of the electrolyte and the actual flow rate of the electrolyte in the electrolytic cell collected in real time; A detection unit, used to detect the operating temperature of the electrolytic cell; a dividing unit, configured to divide at least a first target electrolytic cell from the electrolytic cell according to the working temperature of the electrolytic cell, wherein the first target electrolytic cell is the electrolytic cell with the highest working temperature; The second control unit is used to control the flow rate of the cooling water pipeline in the hydrogen production system based on a given temperature and the operating temperature of the first target electrolyzer, so as to control the operating temperature of the first target electrolyzer.

9. The device according to claim 8, characterized in that The dividing unit is further used to: divide a second target electrolytic cell from the electrolytic cell, wherein the second target electrolytic cell is the electrolytic cell other than the first target electrolytic cell; Accordingly, the device further comprises: The third control unit is used to adjust the given flow rate of the electrolyte corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte based on the preset temperature and the operating temperature of the second target electrolytic cell, so as to control the operating temperature of the second target electrolytic cell.

10. The device according to claim 8, characterized in that The first control unit comprises: A first calculation module, used for calculating the flow difference between the given flow rate of the electrolyte corresponding to the electrolytic cell and the actual flow rate of the electrolyte collected in real time; A first input module, used for inputting the flow difference into a first designated regulator to obtain a first regulating signal; The first control module is used to control the electrolyte circulation pump corresponding to the electrolyzer in the hydrogen production system according to the first adjustment signal to control the actual flow rate of the electrolyte in the electrolyzer, and return to execute the first calculation module.

11. The device according to claim 8, characterized in that The second control unit comprises: A second calculation module, used for calculating a first temperature difference between a given temperature and an operating temperature of the first target electrolytic cell; A second input module, used for inputting the first temperature difference into a second designated regulator to obtain a second regulating signal; The second control module is used to control the water pump on the cooling water pipeline in the hydrogen production system according to the second adjustment signal to control the operating temperature of the first target electrolyzer, and return to execute the second calculation module.

12. The device according to claim 9, characterized in that The third control unit comprises: A third calculation module, used to calculate a second temperature difference between the operating temperature of the second target electrolytic cell and a preset temperature; a third control module, configured to maintain the given electrolyte flow rate corresponding to the second target electrolytic cell for controlling the actual electrolyte flow rate when the second temperature difference is within a preset normal temperature difference range, or when the second temperature difference is greater than an upper limit of the normal temperature difference range, so as to control the operating temperature of the second target electrolytic cell, and return to execute the third calculation module; The fourth control module is used to reduce the given flow rate of the electrolyte corresponding to the second target electrolytic cell for controlling the actual flow rate of the electrolyte by a fixed flow value when the second temperature difference is less than the lower limit of the normal temperature difference range, so as to control the operating temperature of the second target electrolytic cell, and return to execute the third calculation module.

Images