Alkaline electrolysis system and temperature control method thereof

Abstract

The invention discloses an alkaline electrolysis system and a temperature control method thereof, and relates to the field of electrolytic hydrogen production. When an electrolysis loop is in a heating operation state, a first switch valve and a third switch valve are switched on, and a second switch valve and a fourth switch valve are switched off; the heat exchange medium circulating pump pumps steam of a saturated heat exchange medium in the heat exchange medium storage container into the alkali liquor heat exchanger of the electrolysis loop, and when the electrolysis loop is in a cooling operation state, the second switch valve and the fourth switch valve are switched on, and the first switch valve and the third switch valve are switched off; and the heat exchange medium circulating pump pumps the saturated heat exchange medium in the heat exchange medium storage container into the alkali liquor heat exchanger. According to the alkaline electrolysis system, the phase change isothermal characteristic of the saturated heat exchange medium is utilized, heat collection of the electrolysis loop during cooling operation is achieved through phase change of the saturated heat exchange medium into steam, heating of the electrolysis system is achieved through phase change of the steam into the saturated heat exchange medium during heating operation, and the operation energy consumption of the alkaline electrolysis system is reduced.

Description

Technical Field

[0001] This application relates to the field of hydrogen production by electrolysis, and in particular to an alkaline electrolysis system and its temperature control method. Background Technology

[0002] Currently, large-scale industrial production of hydrogen is mostly achieved using alkaline electrolysis systems. To further reduce carbon emissions during hydrogen production, existing alkaline electrolysis systems often use renewable energy as the power input for electrolysis.

[0003] The fluctuating supply of renewable energy power necessitates that existing alkaline electrolysis systems adapt their operation and shutdown to these fluctuations. This requires additional energy to assist in heating the alkaline electrolysis system from a lower temperature, thereby reducing production downtime. However, this also leads to increased energy consumption during operation. Therefore, reducing energy consumption during alkaline electrolysis system operation has become an urgent problem to be solved. Summary of the Invention

[0004] In view of the above problems, this application provides an alkaline electrolysis system and its temperature control method to reduce the energy consumption of the alkaline electrolysis system. The specific solution is as follows:

[0005] By employing the above technical solution, this application provides an alkaline electrolysis system and its temperature control method. By configuring different switching valves and pipelines for each medium inlet and outlet, pathways are constructed for saturated heat exchange media of different phases to flow through the alkaline heat exchanger. Subsequently, when the electrolysis system is in a heating operation state, the first and third switching valves are open, while the second and fourth switching valves are closed. The heat exchange medium circulation pump pumps the vapor of the saturated heat exchange medium in the heat exchange medium storage container into the alkaline heat exchanger. When the electrolysis system is in a cooling operation state, the second and fourth switching valves are open, while the first and third switching valves are closed. The heat exchange medium circulation pump pumps the saturated heat exchange medium in the heat exchange medium storage container into the alkaline heat exchanger. Based on the phase change isothermal characteristics of the saturated heat exchange medium, during the cooling operation state, the saturated heat exchange medium absorbs the heat dissipated by the electrolysis system through phase change. During the heating operation state, the vapor of the saturated heat exchange medium uses the absorbed heat to heat the electrolysis system, achieving heating of the electrolysis system without increasing energy consumption. Finally, this application utilizes a saturated heat exchange medium and its steam as the temperature control medium. By leveraging the isobaric phase change and isotemperature characteristics of the saturated heat exchange medium, it ensures a constant temperature of the saturated heat exchange medium and its steam during the heat exchange process. This reduces temperature fluctuations between the alkali solution and the steam of the saturated heat exchange medium, thereby improving the temperature control accuracy of the alkali solution in the alkaline electrolysis system. Therefore, this application reduces energy consumption during the operation of the alkaline electrolysis system while simultaneously improving the temperature control accuracy of the alkali solution. Attached Figure Description

[0006] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0007] Figures 1 to 3 This application provides a schematic diagram of the structure of an alkaline electrolysis system.

[0008] Figure 4 A flowchart illustrating a temperature control method for an alkaline electrolysis system provided in this application;

[0009] Figure 5 A flowchart illustrating a temperature control method for an alkaline electrolysis system provided in this application;

[0010] Figure 6 This is a schematic diagram of the structure of a controller provided in this application. Detailed Implementation

[0011] The embodiments of this application are described below with reference to the accompanying drawings. The terminology used in the implementation section of this application is for explaining specific embodiments only and is not intended to limit the scope of this application.

[0012] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0013] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0014] It should be noted that, in practical applications, this application reduces energy consumption during operation compared to existing alkaline electrolysis systems. Specifically: Existing alkaline electrolysis systems typically require maintaining a stable electrolysis temperature range to achieve stable hydrogen production. When the input of renewable energy power is insufficient to support electrolysis, the system shuts down. At this time, due to the cessation of the electrolysis reaction and its associated heat generation, the system temperature gradually drops to room temperature due to heat dissipation. When the input of renewable energy power resumes, the alkaline electrolysis system needs to be heated from room temperature back to the stable electrolysis temperature range. Since the existing alkaline electrolysis system's cooler can only provide cooling, an additional electric heating device is required to utilize some renewable energy power to heat the system. Therefore, existing alkaline electrolysis systems suffer from energy waste and high energy consumption. This application, however, constructs pathways for heat exchange media of different phases to flow through the alkaline solution heat exchanger by configuring different switching valves and pipelines at each medium inlet and outlet. Subsequently, by configuring the system so that when the electrolysis system is in heating operation, the first and third switching valves are open, while the second and fourth switching valves are closed, and the heat exchange medium circulation pump pumps the vapor of the saturated heat exchange medium in the heat exchange medium storage container into the alkaline heat exchanger. When the electrolysis system is in cooling operation, the second and fourth switching valves are open, while the first and third switching valves are closed, and the heat exchange medium circulation pump pumps the saturated heat exchange medium in the heat exchange medium storage container into the alkaline heat exchanger. Based on the phase change isothermal characteristics of the saturated heat exchange medium, during cooling operation, the saturated heat exchange medium absorbs the heat dissipated by the electrolysis system through phase change, and during heating operation, the vapor of the saturated heat exchange medium uses the absorbed heat to heat the electrolysis system, thereby achieving heating of the electrolysis system without increasing energy consumption. Therefore, this application reduces the energy consumption of the alkaline electrolysis system during operation.

[0015] The first aspect of this application provides an alkaline electrolysis system, such as... Figure 1 As shown, it includes:

[0016] The system includes an electrolysis circuit 101 with an alkaline heat exchanger 102, a heat exchange medium circulation pump 103, a heat exchange medium storage container 104, a first switching valve 105, a second switching valve 106, a third switching valve 107, a fourth switching valve 108, and a controller 109.

[0017] The heat exchange medium storage container 104 has a first medium outlet 1041, a first medium inlet 1042, a second medium outlet 1043, and a second medium inlet 1044. The first medium outlet 1041 and the first medium inlet 1042 are opened on the side wall of the heat exchange medium storage container 104 and are located at a first preset distance above the liquid surface of the heat exchange medium in the heat exchange medium storage container 104. The second medium outlet 1043 and the second medium inlet 1044 are opened on the side wall and are located at a second preset distance below the liquid surface of the heat exchange medium.

[0018] The first medium outlet 1041 is connected to the first inlet of the heat exchange medium circulation pump 103 through the first switching valve 105 and the pipeline. The second medium outlet 1043 is connected to the second inlet of the heat exchange medium circulation pump 103 through the second switching valve 106 and the pipeline. The outlet of the heat exchange medium circulation pump 103 is connected to the inlet of the alkali heat exchanger 102. The outlet of the alkali heat exchanger 102 is connected to the first medium inlet 1042 through the third switching valve 107 and the pipeline. The outlet of the alkali heat exchanger 102 is also connected to the second medium inlet 1044 through the fourth switching valve 108 and the pipeline.

[0019] Electrolysis circuit 101, heat exchange medium circulation pump 103, first switching valve 105, second switching valve 106, third switching valve 107 and fourth switching valve 108 are all communicatively connected to controller 109.

[0020] When the electrolysis circuit 101 is in the heating operation state, the first switch valve 105 and the third switch valve 107 are turned on, the second switch valve 106 and the fourth switch valve 108 are turned off, and the heat exchange medium circulation pump 103 pumps the vapor of the saturated heat exchange medium in the heat exchange medium storage container 104 into the alkaline heat exchanger 102.

[0021] When the electrolysis circuit 101 is in cooling operation, the second switch valve 106 and the fourth switch valve 108 are turned on, the first switch valve 105 and the third switch valve 107 are turned off, and the heat exchange medium circulation pump 103 pumps the saturated heat exchange medium in the heat exchange medium storage container 104 into the alkaline heat exchanger 102.

[0022] It should be noted that, in practical applications, the aforementioned alkali heat exchanger 102 is used for heat exchange between the saturated heat exchange medium and the alkali solution flowing through the electrolysis circuit. Since alkali solution is a corrosive liquid, the aforementioned alkali heat exchanger 102 can be made of alkali-resistant materials, or the alkali flow channel can be treated to resist alkali corrosion.

[0023] It should be noted that, in actual application scenarios, the heat exchange medium circulation pump 103 is used to pump the saturated heat exchange medium of different phases input by the first switching valve 105 or the second switching valve 106 into the alkaline heat exchanger 102 according to the flow rate issued by the controller 109, and maintain the pressure required for the saturated heat exchange medium to flow back to the heat exchange medium storage container 104.

[0024] It should be noted that, in practical applications, the aforementioned heat exchange medium storage container 104 is a storage container for storing saturated heat exchange medium. Since maintaining the phase stability of the saturated heat exchange medium requires maintaining a certain storage pressure and temperature, the aforementioned heat exchange medium storage container 104 can be further configured as a storage container with an insulation layer and a pressure-resistant shell.

[0025] It should be noted that, in practical applications, the first switching valve 105, the second switching valve 106, the third switching valve 107, and the fourth switching valve 108 are electrically controlled valves, controlled by the controller 109. This application does not impose excessive limitations on the specific types of the aforementioned electrically controlled valves.

[0026] It should be noted that, in practical applications, the controller 109 mentioned above can be an independent controller or a controller integrated into an existing alkaline electrolysis system.

[0027] It should be noted that in practical applications, due to its density, the vapor of the saturated heat exchange medium in the heat exchange medium storage container 104 accumulates above the liquid surface of the saturated heat exchange medium. Therefore, this application configures the heat exchange medium storage container 104 with a first medium outlet 1041, a first medium inlet 1042, a second medium outlet 1043, and a second medium inlet 1044. The first medium outlet 1041 and the first medium inlet 1042 are located on the side wall of the heat exchange medium storage container 104 at a first preset distance above the liquid surface of the heat exchange medium within the heat exchange medium storage container 104, while the second medium outlet 1043 and the second medium inlet 1044 are located on the side wall at a second preset distance below the liquid surface of the heat exchange medium. This allows for the extraction of saturated heat exchange medium in different phases through the first medium outlet 1041 or the second medium inlet 1044 when the electrolysis system is in different operating states.

[0028] It should be noted that, in practical applications, the aforementioned heating operation state refers to the operating state when the temperature of the alkali solution in the current electrolysis circuit is lower than the lower limit of the alkali solution temperature required for stable electrolysis of alkali solution to produce hydrogen, including low-temperature cold start and heating process. This application configures the first switching valve 105 and the third switching valve 107 to be open and the second switching valve 106 and the fourth switching valve 108 to be closed when the electrolysis circuit 101 is in the heating operation state. The heat exchange medium circulation pump 103 pumps the vapor of the saturated heat exchange medium in the heat exchange medium storage container 104 into the alkali solution heat exchanger 102, so that the vapor of the saturated heat exchange medium changes from a vapor phase to a liquid phase in the alkali solution heat exchanger 102, thereby releasing heat and raising the alkali solution temperature.

[0029] It should be noted that, in practical applications, the aforementioned cooling operation state refers to the operation state when the temperature of the alkali solution in the current electrolysis circuit is higher than the upper limit of the alkali solution temperature required for the stable electrolysis of alkali solution to produce hydrogen. This includes the process of stopping the machine during high-temperature electrolysis (alkali solution temperature above 100℃) or electrolysis during cooling (alkali solution temperature 60-85℃). This application configures the second switch valve 106 and the fourth switch valve 108 to be open and the first switch valve 105 and the third switch valve 107 to be closed when the electrolysis circuit 101 is in the cooling operation state. The heat exchange medium circulation pump 103 pumps the saturated heat exchange medium in the heat exchange medium storage container 104 into the alkali solution heat exchanger 102, so that the liquid saturated heat exchange medium changes from a liquid phase to a gas phase (i.e., the vapor of the aforementioned saturated heat exchange medium) in the alkali solution heat exchanger 102, thereby absorbing the heat released by the alkali solution, so that the absorbed heat can be used for heating in the next heating operation state.

[0030] It should be noted that in practical applications, existing alkaline electrolysis systems cool the alkaline solution by exchanging heat between the alkaline solution and a low-temperature heat exchange medium output from a cooler. During this process, the alkaline solution temperature decreases while the heat exchange medium temperature increases, causing continuous fluctuations in the temperature difference between the heat exchange medium and the alkaline solution, making it impossible to accurately maintain the alkaline solution temperature within a stable range. However, the saturated heat exchange medium and its vapor used in this application maintain a stable pressure throughout the flow process (provided by the heat exchange medium circulation pump 103). This allows heat exchange with the alkaline solution to occur through a phase change (transformation between gaseous and liquid states). During this process, the temperature of the saturated heat exchange medium and its vapor themselves does not change; the absorbed or released heat only alters the dryness of the heat exchange medium through the phase change. Therefore, the alkaline electrolysis system using a saturated mixed heat medium provided in this application improves the accuracy of alkaline solution temperature control compared to existing alkaline electrolysis systems.

[0031] It should be noted that in practical applications, the aforementioned saturated heat exchange medium can be a variety of saturated heat exchange media. The components of the heat exchange medium include, but are not limited to: water, heat exchange oil, biphenyl-biphenyl ether mixture, high-temperature paraffin, etc.

[0032] This application constructs pathways for saturated heat exchange media of different phases to flow through an alkaline heat exchanger by configuring different switching valves and pipelines for each medium inlet and outlet. Subsequently, when the electrolysis system is in heating operation, the first and third switching valves are open, while the second and fourth switching valves are closed. The heat exchange medium circulation pump pumps the vapor of the saturated heat exchange medium from the storage container into the alkaline heat exchanger. When the electrolysis system is in cooling operation, the second and fourth switching valves are open, while the first and third switching valves are closed. The heat exchange medium circulation pump pumps the saturated heat exchange medium from the storage container into the alkaline heat exchanger. Based on the isothermal phase change characteristics of the saturated heat exchange medium, during cooling operation, the saturated heat exchange medium absorbs the heat dissipated by the electrolysis system through phase change. During heating operation, the vapor of the saturated heat exchange medium uses the absorbed heat to heat the electrolysis system, achieving heating of the electrolysis system without increasing energy consumption. Finally, this application utilizes a saturated heat exchange medium and its steam as the temperature control medium. By leveraging the isobaric phase change and isotemperature characteristics of the saturated heat exchange medium, it ensures a constant temperature of the saturated heat exchange medium and its steam during the heat exchange process. This reduces temperature fluctuations between the alkali solution and the steam of the saturated heat exchange medium, thereby improving the temperature control accuracy of the alkali solution in the alkaline electrolysis system. Therefore, this application reduces energy consumption during the operation of the alkaline electrolysis system while simultaneously improving the temperature control accuracy of the alkali solution.

[0033] In one possible implementation, the alkaline electrolysis system provided in the first aspect of this application further includes:

[0034] Pressure sensor, fifth switching valve, sixth switching valve, and heat exchange medium steam storage container,

[0035] The steam outlet of the heat exchange medium steam storage container is connected to the steam inlet of the heat exchange medium storage container 104 through the sixth switch valve, and the steam inlet of the heat exchange medium steam storage container is connected to the steam outlet of the heat exchange medium storage container 104 through the fifth switch valve.

[0036] The pressure sensor is located inside the heat exchange medium storage container 104. The pressure sensor, the sixth switching valve, and the fifth switching valve are all connected in communication with the controller 109.

[0037] It should be noted that in practical applications, during the cooling process of the electrolysis system, the saturated heat exchange medium changes from liquid to vapor after flowing through the alkaline heat exchanger 102. At this time, the vapor of this saturated heat exchange medium flows back to the heat exchange medium storage container 104, causing the internal pressure of the heat exchange medium storage container 104 to increase. Excessive pressure can affect the safety of the equipment. Therefore, this application configures a pressure sensor inside the heat exchange medium storage container 104, and connects the steam outlet of the heat exchange medium steam storage container to the steam inlet of the heat exchange medium storage container 104 via a sixth switching valve. The steam inlet of the heat exchange medium steam storage container is connected to the steam outlet of the heat exchange medium storage container 104 via a fifth switching valve. This allows for the introduction of some saturated heat exchange medium steam into the heat exchange medium steam storage container when the internal pressure of the heat exchange medium storage container 104 is too high, and the introduction of saturated heat exchange medium steam into the heat exchange medium steam storage container when the internal pressure of the heat exchange medium storage container 104 is too low. This avoids energy waste while ensuring that the amount of saturated heat exchange medium steam meets the heating requirements of the electrolysis system. In one possible implementation, for a pressure sensor with a separate sensing probe, only the sensing probe needs to be placed inside the heat exchange medium storage container 104. For a pressure sensor with a fixed sensing probe, an opening can be made in the wall of the heat exchange medium storage container 104 to prevent the pressure sensor from being installed, and the interface can be sealed.

[0038] It should be noted that, in practical applications, the aforementioned heat exchange medium steam storage container can be a steam storage container made of high-temperature and high-pressure resistant materials. In order to ensure that the stored saturated heat exchange medium steam is always kept in a gaseous state and that steam is discharged normally, the aforementioned heat exchange medium steam storage container can also be equipped with a pressurization device.

[0039] In one possible implementation, the structural diagram of the alkaline electrolysis system with the added pressure sensor, sixth switching valve, fifth switching valve, and heat exchange medium vapor storage container is shown below. Figure 2 (in the above) Figure 1 (Based on further improvements) As shown. Pressure sensor 201 is a pressure sensor equipped with a fixed probe, which is placed inside the heat exchange medium storage container 104, while the main body is located outside the heat exchange medium storage container 104 for easy manual observation. The steam outlet of the heat exchange medium steam storage container 202 is connected to the steam inlet of the heat exchange medium storage container 104 through the sixth switching valve 204, and the steam inlet of the heat exchange medium steam storage container 202 is connected to the steam outlet of the heat exchange medium storage container 104 through the fifth switching valve 203. Pressure sensor 201, the sixth switching valve 204, and the fifth switching valve 203 are all communicatively connected to controller 109.

[0040] In one possible implementation, the electrolysis circuit 101 described above includes:

[0041] The system includes an alkaline electrolytic reactor, an anode main gas-liquid separator, a cathode main gas-liquid separator, an alkaline solution circulation pump, an alkaline solution mixing container, an alkaline solution temperature sensor, an alkaline solution flow rate sensor, and a water replenishment device. The alkaline solution outlet of the alkaline solution heat exchanger 102 is connected to the inlet of the alkaline solution circulation pump via a pipeline. The outlet of the alkaline solution circulation pump is connected to the positive electrode inlet of the alkaline electrolytic reactor via a pipeline. The outlet of the alkaline solution circulation pump is also connected to the negative electrode inlet of the alkaline electrolytic reactor via a pipeline. The positive electrode liquid-gas outlet of the alkaline electrolytic reactor is connected to the anode main gas-liquid separator via a pipeline. The inlet of the separator is connected, the alkaline outlet of the anode main gas-liquid separator is connected to the first inlet of the alkaline mixing container through a pipeline, the cathode liquid-gas outlet of the alkaline electrolytic reactor is connected to the inlet of the cathode main gas-liquid separator through a pipeline, the alkaline outlet of the cathode main gas-liquid separator is connected to the second inlet of the alkaline mixing container through a pipeline, the outlet of the alkaline mixing container is connected to the alkaline inlet of the alkaline heat exchanger 102 through a pipeline, and the liquid outlet of the water replenishment device is connected to the water replenishment port of the cathode main gas-liquid separator through a pipeline.

[0042] The alkaline solution temperature sensor and the alkaline solution flow rate sensor are installed in the pipeline between the alkaline solution mixing container and the alkaline solution heat exchanger 102;

[0043] Both the alkali temperature sensor and the alkali flow rate sensor are connected to the controller 109 for communication.

[0044] It should be noted that in practical applications, the aforementioned alkaline electrolyzer can be a reactor that uses externally input electrical energy to electrolyze alkaline solutions to produce hydrogen. The internal reaction is as follows: Specifically, electrolysis occurs at both the anode and cathode of this alkaline electrolytic reactor. The anode undergoes an oxidation reaction to produce oxygen, and its electrochemical formula is: At the cathode, a reduction reaction occurs to produce hydrogen gas, and its electrochemical formula is: .

[0045] It should be noted that in practical applications, the high temperatures generated during electrolysis at the positive and negative electrodes of an alkaline electrolytic reactor lead to the evaporation of the alkaline solution. Therefore, the mixed gas produced at the anode and cathode includes hydrogen, oxygen, and alkaline vapor. Collecting these components collectively would reduce the purity of the generated hydrogen and the byproduct oxygen. Therefore, this application configures the positive electrode liquid-gas outlet of the alkaline electrolytic reactor to be connected to the inlet of the anode main gas-liquid separator via a pipeline; the alkaline outlet of the anode main gas-liquid separator to be connected to the first inlet of the alkaline mixing container via a pipeline; the negative electrode liquid-gas outlet of the alkaline electrolytic reactor to be connected to the inlet of the negative electrode main gas-liquid separator via a pipeline; and the alkaline outlet of the negative electrode main gas-liquid separator to be connected to the second inlet of the alkaline mixing container via a pipeline. This allows the anode and negative electrode main gas-liquid separators to separate impurities such as vapor and moisture from the mixed hydrogen and oxygen, thereby improving the purity of the obtained hydrogen and oxygen.

[0046] It should be noted that in practical applications, a large number of alkaline ions are generated during electrolysis at the cathode of an alkaline electrolytic reactor, leading to an increase in the alkalinity of the alkaline solution after cathode electrolysis. Stable electrolysis requires maintaining the alkaline solution within a set alkalinity range. During electrolysis at the anode of the alkaline electrolytic reactor, water molecules are generated. Therefore, this application connects the alkaline solution outlet of the anode main gas-liquid separator to the first inlet of the alkaline solution mixing container via a pipeline, and the alkaline solution outlet of the cathode main gas-liquid separator to the second inlet of the alkaline solution mixing container via a pipeline. This utilizes the alkaline solution with a higher water content separated by the anode main gas-liquid separator to dilute the alkaline solution separated by the cathode main gas-liquid separator, thereby reducing the alkalinity of the mixed alkaline solution and maintaining it within the set alkalinity range.

[0047] It should be noted that in practical applications, water is consumed during electrolysis at the cathode of an alkaline electrolytic reactor. If excessive water consumption leads to excessively high alkalinity in the cathode alkali solution, the alkali solution separated solely by the anode main gas-liquid separator cannot maintain the concentration of the mixed alkali solution within the set alkalinity range. Therefore, this application addresses this by configuring a water replenishment device whose liquid outlet is connected to the water replenishment port of the cathode main gas-liquid separator via a pipeline, thereby assisting in reducing the alkalinity of the cathode alkali solution entering the alkali solution mixing container.

[0048] In one possible implementation, the electrolysis circuit 101 described above further includes:

[0049] Anode auxiliary gas-liquid separator and cathode auxiliary gas-liquid separator,

[0050] The gas outlet of the anode main gas-liquid separator is connected to the gas inlet of the anode auxiliary gas-liquid separator via a pipeline; the hydrogen outlet of the anode auxiliary gas-liquid separator is connected to the inlet of the hydrogen storage container; and the wastewater outlet of the anode auxiliary gas-liquid separator is connected to the inlet of the wastewater collector.

[0051] The gas outlet of the cathode main gas-liquid separator is connected to the gas inlet of the cathode auxiliary gas-liquid separator via a pipeline. The hydrogen outlet of the cathode auxiliary gas-liquid separator is connected to the inlet of the hydrogen storage container. The wastewater outlet of the cathode auxiliary gas-liquid separator is connected to the inlet of the wastewater collector.

[0052] It should be noted that, in practical applications, this application further improves the purity of the finally collected hydrogen and oxygen by configuring the above-mentioned anode auxiliary gas-liquid separator and cathode auxiliary gas-liquid separator.

[0053] In one possible implementation, the aforementioned water replenishment device includes:

[0054] Storage tank, water pump, and alkali concentration sensor,

[0055] The outlet of the storage tank is connected to the inlet of the water supply pump via a pipeline, and the outlet of the water supply pump is connected to the water supply port of the cathode main gas-liquid separator.

[0056] The alkaline solution concentration sensor is installed inside the cathode main gas-liquid separator;

[0057] Both the alkali concentration sensor and the water replenishment pump are connected to the controller 109 via communication.

[0058] To facilitate understanding of the structure of the alkaline electrolysis system provided by the first aspect and any implementation thereof of this application, an example of a possible implementation of this application is described below:

[0059] like Figure 3 (in the above) Figure 2As shown in the diagram (based on further improvements), this is a schematic diagram of an alkaline electrolysis system. The alkaline outlet of the alkaline heat exchanger 102 is connected to the inlet of the alkaline circulation pump 304 via a pipeline. The outlet of the alkaline circulation pump 304 is connected to the positive electrode inlet of the alkaline electrolysis reactor 301 via a pipeline. The outlet of the alkaline circulation pump 304 is also connected to the negative electrode inlet of the alkaline electrolysis reactor 301 via a pipeline. The positive electrode liquid-gas outlet of the alkaline electrolysis reactor 301 is connected to the inlet of the anode main gas-liquid separator 302 via a pipeline. The alkaline outlet of the anode main gas-liquid separator 302 is connected to the first inlet of the alkaline mixing container 305 via a pipeline. The cathode of the alkaline electrolysis reactor 301... The liquid-gas outlet is connected to the inlet of the cathode main gas-liquid separator 303 via a pipeline. The alkali outlet of the cathode main gas-liquid separator 303 is connected to the second inlet of the alkali mixing container 305 via a pipeline. The outlet of the alkali mixing container 305 is connected to the alkali inlet of the alkali heat exchanger 102 via a pipeline. The liquid outlet of the water replenishment device is connected to the water replenishment port of the cathode main gas-liquid separator 303 via a pipeline. The alkali temperature sensor 306 and the alkali flow rate sensor 307 are installed in the pipeline between the alkali mixing container 305 and the alkali heat exchanger 102. Both sensor 306 and alkali flow rate sensor 307 are communicatively connected to controller 109. The gas outlet of the anode main gas-liquid separator 302 is connected to the gas inlet of the anode auxiliary gas-liquid separator 308 via a pipeline. The oxygen outlet of the anode auxiliary gas-liquid separator 308 is connected to the inlet of the oxygen storage container. The wastewater outlet of the anode auxiliary gas-liquid separator 308 is connected to the inlet of the wastewater collector. The gas outlet of the cathode main gas-liquid separator 303 is connected to the gas inlet of the cathode auxiliary gas-liquid separator 309 via a pipeline. The hydrogen outlet of the cathode auxiliary gas-liquid separator 309 is connected to the inlet of the hydrogen storage container. The wastewater outlet of the cathode auxiliary gas-liquid separator 309 is connected to the inlet of the wastewater collector. The water replenishment device includes a storage tank 3081, a water replenishment pump 3082, and an alkaline concentration sensor 3083. The outlet of the storage tank 3081 is connected to the inlet of the water replenishment pump 3082 via a pipeline, and the outlet of the water replenishment pump 3082 is connected to the water replenishment port of the cathode main gas-liquid separator 303. The alkaline concentration sensor 3083 is installed inside the cathode main gas-liquid separator 303. Both the alkaline concentration sensor 3083 and the water replenishment pump 3082 are communicatively connected to the controller 109. Figure 3 The flow of alkaline solution through the loop is indicated by a dotted-line mixed line, the flow of gas through the loop is indicated by a dotted line, the flow of saturated heat exchange medium, water and sewage through the loop is indicated by a solid line, the loop for communication connection is indicated by a dashed line, and the arrows in the loop indicate the flow direction of the flowing medium in the corresponding loop.

[0060] A second aspect of this application provides a temperature control method for an alkaline electrolysis system, applicable to a controller of an alkaline electrolysis system as described in the first aspect and any implementation thereof, such as... Figure 4 As shown, the temperature control method for the above-mentioned alkaline electrolysis system includes:

[0061] S401. Obtain the current alkaline solution temperature and current alkaline solution flow rate of the electrolysis circuit of the alkaline electrolysis system, and determine the operating status of the electrolysis circuit based on the current alkaline solution temperature.

[0062] It should be noted that, in practical application scenarios, the above step S401 can be performed periodically according to a preset sampling period.

[0063] It should be noted that, in practical applications, the current alkaline solution temperature and current alkaline solution flow rate in step S401 above can be collected by the corresponding sensors in the electrolysis circuit at the current sampling time.

[0064] S402. When the electrolysis circuit is in a heating operation state, control the first and third switch valves to open, control the second and fourth switch valves to close, and control the heat exchange medium circulation pump to pump the vapor of the saturated heat exchange medium in the heat exchange medium storage container into the alkali heat exchanger of the electrolysis circuit based on the current alkali temperature and the current alkali flow rate.

[0065] It should be noted that, in practical application scenarios, this application configures the first and third switching valves to be turned on and the second and fourth switching valves to be turned off when the electrolysis circuit is in a heating operation state. Based on the current alkali temperature and current alkali flow rate, the heat exchange medium circulation pump is controlled to pump the vapor of the saturated heat exchange medium in the heat exchange medium storage container into the alkali heat exchanger of the electrolysis circuit, so that the vapor of the saturated heat exchange medium exchanges heat with the alkali in the alkali heat exchanger, thereby increasing the alkali temperature.

[0066] It should be noted that, in practical applications, the principle of heat exchange between the steam of the aforementioned saturated heat exchange medium and the alkaline solution is as follows: the gaseous steam of the saturated heat exchange medium undergoes a phase change in the alkaline solution heat exchanger, transforming into a liquid saturated heat exchange medium. During this process, only the dryness (quality) changes; the temperature of the saturated heat exchange medium itself remains unchanged before and after the phase change. Instead, some of the steam condenses into a liquid state, meaning that heat is released from the steam of the saturated heat exchange medium in the form of enthalpy of vaporization through a decrease in dryness.

[0067] Furthermore, since the temperature of the saturated heat exchange medium itself remains unchanged during the heating operation, compared to the large temperature fluctuations caused by the simultaneous changes in the temperatures of the heat exchange medium and the alkali solution in existing alkaline electrolysis systems, the temperature fluctuation between the saturated heat exchange medium and the alkali solution in this application is smaller. Therefore, this application can adjust the alkali solution temperature by controlling the steam flow rate of the saturated heat exchange medium based on the current alkali solution temperature and flow rate, thus improving the accuracy of alkali solution temperature control.

[0068] S403. When the electrolysis circuit is in a cooling operation state, control the second and fourth switch valves to open, control the first and third switch valves to close, and control the heat exchange medium circulation pump to pump the saturated heat exchange medium in the heat exchange medium storage container into the alkali heat exchanger based on the current alkali temperature and the current alkali flow rate.

[0069] It should be noted that, in practical application scenarios, this application configures the second and fourth switching valves to be turned on and the first and third switching valves to be turned off when the electrolysis circuit is in a cooling operation state. Based on the current alkali temperature and current alkali flow rate, the heat exchange medium circulation pump is controlled to pump the saturated heat exchange medium in the heat exchange medium storage container into the alkali heat exchanger, so that the saturated heat exchange medium exchanges heat with the alkali in the alkali heat exchanger and stores the heat dissipated by the alkali.

[0070] It should be noted that, in practical applications, the principle of heat exchange between the vapor of the saturated heat exchange medium and the alkaline solution during the cooling operation described above is as follows: the liquid saturated heat exchange medium in the alkaline solution heat exchanger receives heat dissipated from the alkaline solution and transforms into gaseous vapor of the saturated heat exchange medium, thus storing the heat in the form of the enthalpy of vaporization of the saturated heat exchange medium. During this process, only the dryness (quality) changes; the temperature of the saturated heat exchange medium itself remains unchanged before and after the phase change, and the heat dissipated by the alkaline solution is only used for the phase change of the saturated heat exchange medium.

[0071] In one possible implementation, the alkaline electrolysis system provided in the first aspect of this application further includes:

[0072] Pressure sensor, fifth switching valve, sixth switching valve, and heat exchange medium steam storage container,

[0073] The steam outlet of the heat exchange medium steam storage container is connected to the steam inlet of the heat exchange medium storage container through the sixth switch valve, and the steam inlet of the heat exchange medium steam storage container is connected to the steam outlet of the heat exchange medium storage container through the fifth switch valve.

[0074] The pressure sensor is located inside the heat exchange medium storage container. The pressure sensor, the sixth switching valve, and the fifth switching valve are all connected to the controller.

[0075] The temperature control method for the alkaline electrolysis system provided in the second aspect of this application further includes:

[0076] The pressure sensor continuously collects the pressure inside the heat exchange medium storage container;

[0077] When the pressure is less than the preset lower pressure threshold, the sixth switch valve is controlled to close, the fifth switch valve is controlled to open, and the steam of the saturated heat exchange medium is controlled to be introduced into the heat exchange medium storage container until the pressure is not less than the preset lower pressure threshold.

[0078] When the pressure is not less than the preset lower pressure threshold and not greater than the preset upper pressure threshold, control the sixth and fifth switching valves to close.

[0079] When the pressure exceeds the preset upper limit threshold, the sixth switch valve is shut off and the fifth switch valve is opened, controlling the heat exchange medium steam storage container to draw in the steam of the heat exchange medium in the heat exchange medium storage container until the pressure does not exceed the preset upper limit threshold.

[0080] It should be noted that, in practical applications, the aforementioned preset upper pressure threshold can be the upper limit of the safe pressure obtained from calibration tests of the heat exchange medium storage container to maintain steam in a saturated state, and the aforementioned preset lower pressure threshold can be the lower limit of the safe pressure obtained from calibration tests of the heat exchange medium storage container to maintain steam in a saturated state. This application configures the pressure inside the heat exchange medium storage container to compare with the preset upper pressure threshold and / or the preset lower pressure threshold, thereby controlling the opening or closing of the sixth and / or fifth switching valves. This achieves the storage and release of steam from the saturated heat exchange medium, ensuring that the amount of steam from the saturated heat exchange medium meets the heat requirements for alkali heating under various conditions.

[0081] In one possible implementation, the above electrolysis circuit includes:

[0082] Alkaline electrolytic reactor, anode main gas-liquid separator, cathode main gas-liquid separator, alkaline solution circulation pump, alkaline solution mixing container, alkaline solution temperature sensor, alkaline solution flow rate sensor, and water replenishment device.

[0083] The alkali outlet of the alkali heat exchanger is connected to the inlet of the alkali circulation pump via a pipeline. The outlet of the alkali circulation pump is connected to the positive electrode inlet of the alkaline electrolytic reactor via a pipeline. The outlet of the alkali circulation pump is also connected to the negative electrode inlet of the alkaline electrolytic reactor via a pipeline. The positive electrode liquid-gas outlet of the alkaline electrolytic reactor is connected to the inlet of the anode main gas-liquid separator via a pipeline. The alkali outlet of the anode main gas-liquid separator is connected to the first inlet of the alkali mixing container via a pipeline. The cathode liquid-gas outlet of the alkaline electrolytic reactor is connected to the inlet of the cathode main gas-liquid separator via a pipeline. The alkali outlet of the cathode main gas-liquid separator is connected to the second inlet of the alkali mixing container via a pipeline. The outlet of the alkali mixing container is connected to the alkali inlet of the alkali heat exchanger via a pipeline. The liquid outlet of the water supply device is connected to the water supply port of the cathode main gas-liquid separator via a pipeline.

[0084] The alkaline solution temperature sensor and the alkaline solution flow rate sensor are installed in the pipeline between the alkaline solution mixing container and the alkaline solution heat exchanger.

[0085] Both the alkali solution temperature sensor and the alkali solution flow rate sensor are connected to the controller via communication.

[0086] The aforementioned alkali heat exchanger, which controls the heat exchange medium circulation pump to pump the vapor of the saturated heat exchange medium in the heat exchange medium storage container into the electrolysis circuit based on the current alkali solution temperature and flow rate, includes:

[0087] Find the first heat exchange flow rate that matches the current alkali solution temperature and current alkali solution flow rate, and control the heat exchange medium circulation pump based on the first heat exchange flow rate to pump the vapor of the saturated heat exchange medium into the alkali solution heat exchanger.

[0088] In one possible implementation, based on the current alkali solution temperature and current alkali solution flow rate, a heat exchange medium circulation pump is controlled to pump the saturated heat exchange medium from the heat exchange medium storage container into the alkali solution heat exchanger, including:

[0089] Find a second heat exchange flow rate that matches the current alkali solution temperature and flow rate, and control the heat exchange medium circulation pump to pump the saturated heat exchange medium into the alkali solution heat exchanger based on the second heat exchange flow rate.

[0090] It should be noted that, in practical application scenarios, the above-mentioned adaptation relationships of current alkali temperature, current alkali flow rate core, and first heat exchange flow rate, as well as the adaptation relationships of current alkali temperature, current alkali flow rate core, and second heat exchange flow rate, can be obtained by calibrating the heat exchange efficiency of saturated heat exchange medium and saturated heat exchange medium steam at different flow rates and temperatures.

[0091] In one possible implementation, the operating state of the electrolysis circuit is determined based on the current alkali solution temperature, including:

[0092] When the current alkaline solution temperature is lower than the lower limit of the preset stable electrolysis temperature range, the output indicates that the electrolysis circuit is in a heating operation state.

[0093] When the current alkali solution temperature is greater than the upper limit of the preset stable electrolysis temperature range, the output indicates that the electrolysis circuit is in a cooling operation state.

[0094] It should be noted that, in practical applications, the aforementioned preset stable electrolysis temperature range can be determined after conducting electrolysis efficiency calibration tests on the alkali electrolysis system.

[0095] In one possible implementation, when the current alkali solution temperature is within a preset stable electrolysis temperature range, an operating status indicating that the electrolysis circuit is in a stable operating state is output. When the electrolysis circuit is in a stable operating state, the current open / closed states of the first, second, third, and fourth switching valves are maintained, and based on the current alkali solution temperature and current alkali solution flow rate, the heat exchange medium circulation pump is controlled to continuously pump the heat exchange medium from the alkali solution heat exchanger into the alkali solution heat exchanger.

[0096] To facilitate understanding of the temperature control method for the alkaline electrolysis system provided in the second aspect of this application, an example of a possible implementation of this application is described below:

[0097] like Figure 5 The diagram shows a flowchart of a temperature control method for an alkaline electrolysis system. The specific operation steps are as follows:

[0098] Step S501: Obtain the current alkaline solution temperature and current alkaline solution flow rate of the electrolysis circuit of the alkaline electrolysis system. Then trigger step S502.

[0099] Step S502: Determine whether the current alkali solution temperature is within the preset stable electrolysis temperature range. If yes, trigger step S503; otherwise, trigger step S504.

[0100] Step S503: Maintain the current open / closed states of the first, second, third, and fourth switching valves, and based on the current alkali solution temperature and flow rate, control the heat exchange medium circulation pump to continuously circulate the heat exchange medium in the alkali solution heat exchanger into the alkali solution heat exchanger. This triggers step S501.

[0101] Step S504: Determine whether the current alkali solution temperature is lower than the lower limit of the preset stable electrolysis temperature range. If yes, trigger step S505; otherwise, trigger step S506.

[0102] Step S505: Control the first and third switching valves to open, control the second and fourth switching valves to close, and based on the current alkali solution temperature and current alkali solution flow rate, control the heat exchange medium circulation pump to pump the vapor of the saturated heat exchange medium in the heat exchange medium storage container into the alkali solution heat exchanger of the electrolysis circuit. This triggers step S501.

[0103] Step S506: Control the second and fourth switching valves to open, control the first and third switching valves to close, and based on the current alkali solution temperature and current alkali solution flow rate, control the heat exchange medium circulation pump to pump the saturated heat exchange medium in the heat exchange medium storage container into the alkali solution heat exchanger. This triggers step S501.

[0104] A third aspect of this application provides a controller, including at least one processor and a memory connected to the processor, wherein:

[0105] The memory is used to store computer programs;

[0106] The processor is used to execute the computer program so that the electronic device can implement the temperature control method of the alkaline electrolysis system described in the first aspect or any implementation thereof.

[0107] The third aspect of this application provides a schematic diagram of the controller's structure. The controller in the embodiments of this application may include, but is not limited to, fixed terminals such as an alkaline electrolysis system control terminal, a desktop computer, a mobile control terminal, etc. Figure 6 The controller shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0108] like Figure 6 As shown, the controller may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage device 608 into a random access memory (RAM) 603. When the controller is powered on, the RAM 603 also stores various programs and data required for controller operation. The processing device 601, ROM 602, and RAM 603 are interconnected via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0109] Typically, the following devices can be connected to I / O interface 605: input devices 606 including, for example, a touchscreen, touchpad, keyboard, mouse, camera, microphone, accelerometer, gyroscope, etc.; output devices 607 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 608 including, for example, memory card, hard disk, etc.; and communication devices 609. Communication device 609 allows the controller to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 6 A controller with various devices is shown; however, it should be understood that implementation or possession of all the devices shown is not required. More or fewer devices may be implemented alternatively.

[0110] It should also be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. In addition, in the device embodiment drawings provided in this application, the connection relationship between modules indicates that they have a communication connection, which can be implemented as one or more communication buses or signal lines.

[0111] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware, or it can be implemented by special-purpose hardware including application-specific integrated circuits, special-purpose CPUs, special-purpose memory, special-purpose components, etc. Generally, any function performed by a computer program can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be diverse, such as analog circuits, digital circuits, or special-purpose circuits. However, for this application, software program implementation is more often the preferred implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium, such as a computer floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk, or optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, training equipment, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0112] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product.

[0113] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, training device, or data center to another website, computer, training device, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)).

Claims

1. An alkaline electrolysis system, characterized in that, include: An electrolysis circuit equipped with an alkaline heat exchanger, a heat exchange medium circulation pump, a heat exchange medium storage container, a first switching valve, a second switching valve, a third switching valve, a fourth switching valve, and a controller; The heat exchange medium storage container has a first medium outlet, a first medium inlet, a second medium outlet, and a second medium inlet. The first medium outlet and the first medium inlet are located on the side wall of the heat exchange medium storage container and at a first preset distance above the liquid surface of the heat exchange medium in the heat exchange medium storage container. The second medium outlet and the second medium inlet are located on the side wall and at a second preset distance below the liquid surface of the heat exchange medium. The first medium outlet is connected to the first inlet of the heat exchange medium circulation pump through the first switching valve and pipeline; the second medium outlet is connected to the second inlet of the heat exchange medium circulation pump through the second switching valve and pipeline; the outlet of the heat exchange medium circulation pump is connected to the inlet of the alkali heat exchanger; the outlet of the alkali heat exchanger is connected to the first medium inlet through the third switching valve and pipeline; and the outlet of the alkali heat exchanger is also connected to the second medium inlet through the fourth switching valve and pipeline. The electrolysis circuit, the heat exchange medium circulation pump, the first switching valve, the second switching valve, the third switching valve, and the fourth switching valve are all communicatively connected to the controller; When the electrolysis circuit is in the heating operation state, the first switch valve and the third switch valve are turned on, the second switch valve and the fourth switch valve are turned off, and the heat exchange medium circulation pump pumps the vapor of the saturated heat exchange medium in the heat exchange medium storage container into the alkaline heat exchanger. When the electrolysis circuit is in cooling operation, the second and fourth switching valves are turned on, the first and third switching valves are turned off, and the heat exchange medium circulation pump pumps the saturated heat exchange medium in the heat exchange medium storage container into the alkali heat exchanger.

2. The alkaline electrolysis system according to claim 1, characterized in that, The alkaline electrolysis system further includes: Pressure sensor, fifth switching valve, sixth switching valve, and heat exchange medium steam storage container, The steam outlet of the heat exchange medium steam storage container is connected to the steam inlet of the heat exchange medium storage container through the sixth switching valve, and the steam inlet of the heat exchange medium steam storage container is connected to the steam outlet of the heat exchange medium storage container through the fifth switching valve. The pressure sensor is located inside the heat exchange medium storage container, and the pressure sensor, the sixth switching valve, and the fifth switching valve are all communicatively connected to the controller.

3. The alkaline electrolysis system according to claim 1, characterized in that, The electrolysis circuit includes: Alkaline electrolytic reactor, anode main gas-liquid separator, cathode main gas-liquid separator, alkaline solution circulation pump, alkaline solution mixing container, alkaline solution temperature sensor, alkaline solution flow rate sensor, and water replenishment device. The alkali outlet of the alkali heat exchanger is connected to the inlet of the alkali circulation pump via a pipeline. The outlet of the alkali circulation pump is connected to the positive electrode inlet of the alkaline electrolytic reactor via a pipeline. The outlet of the alkali circulation pump is also connected to the negative electrode inlet of the alkaline electrolytic reactor via a pipeline. The positive electrode liquid-gas outlet of the alkaline electrolytic reactor is connected to the inlet of the anode main gas-liquid separator via a pipeline. The alkali outlet of the anode main gas-liquid separator is connected to the first inlet of the alkali mixing container via a pipeline. The cathode liquid-gas outlet of the alkaline electrolytic reactor is connected to the inlet of the cathode main gas-liquid separator via a pipeline. The alkali outlet of the cathode main gas-liquid separator is connected to the second inlet of the alkali mixing container via a pipeline. The outlet of the alkali mixing container is connected to the alkali inlet of the alkali heat exchanger via a pipeline. The liquid outlet of the water replenishment device is connected to the water replenishment port of the cathode main gas-liquid separator via a pipeline. The alkali temperature sensor and the alkali flow rate sensor are installed in the pipeline between the alkali mixing container and the alkali heat exchanger; Both the alkali temperature sensor and the alkali flow rate sensor are communicatively connected to the controller.

4. The alkaline electrolysis system according to claim 3, characterized in that, The electrolysis circuit further includes: Anode auxiliary gas-liquid separator and cathode auxiliary gas-liquid separator, The gas outlet of the main anode gas-liquid separator is connected to the gas inlet of the auxiliary anode gas-liquid separator via a pipeline; the hydrogen outlet of the auxiliary anode gas-liquid separator is connected to the inlet of the hydrogen storage container; and the wastewater outlet of the auxiliary anode gas-liquid separator is connected to the inlet of the wastewater collector. The gas outlet of the cathode main gas-liquid separator is connected to the gas inlet of the cathode auxiliary gas-liquid separator via a pipeline. The hydrogen outlet of the cathode auxiliary gas-liquid separator is connected to the inlet of the hydrogen storage container. The wastewater outlet of the cathode auxiliary gas-liquid separator is connected to the inlet of the wastewater collector.

5. The alkaline electrolysis system according to claim 4, characterized in that, The water replenishment device includes: Storage tank, water pump, and alkali concentration sensor, The outlet of the storage tank is connected to the inlet of the water supply pump via a pipeline, and the outlet of the water supply pump is connected to the water supply port of the cathode main gas-liquid separator. The alkaline concentration sensor is installed inside the cathode main gas-liquid separator; Both the alkali concentration sensor and the water replenishment pump are communicatively connected to the controller.

6. A temperature control method for an alkaline electrolysis system, characterized in that, A controller applied to an alkaline electrolysis system as described in any one of claims 1 to 5, wherein the temperature control method of the alkaline electrolysis system comprises: The current alkaline solution temperature and current alkaline solution flow rate of the electrolysis circuit of the alkaline electrolysis system are obtained, and the operating status of the electrolysis circuit is determined based on the current alkaline solution temperature. When the operating state indicates that the electrolysis circuit is in a heating operation state, the first and third switching valves are controlled to open, the second and fourth switching valves are controlled to close, and based on the current alkali temperature and the current alkali flow rate, the heat exchange medium circulation pump is controlled to pump the vapor of the saturated heat exchange medium in the heat exchange medium storage container into the alkali heat exchanger of the electrolysis circuit. When the operating state indicates that the electrolysis circuit is in a cooling operation state, the second and fourth switching valves are controlled to open, the first and third switching valves are controlled to close, and based on the current alkali temperature and the current alkali flow rate, the heat exchange medium circulation pump is controlled to pump the saturated heat exchange medium in the heat exchange medium storage container into the alkali heat exchanger.

7. The temperature control method for the alkaline electrolysis system according to claim 6, characterized in that, The alkaline electrolysis system further includes: Pressure sensor, fifth switching valve, sixth switching valve, and heat exchange medium steam storage container, The steam outlet of the heat exchange medium steam storage container is connected to the steam inlet of the heat exchange medium storage container through the sixth switching valve, and the steam inlet of the heat exchange medium steam storage container is connected to the steam outlet of the heat exchange medium storage container through the fifth switching valve. The pressure sensor is installed inside the heat exchange medium storage container, and the pressure sensor, the sixth switching valve, and the fifth switching valve are all communicatively connected to the controller; The temperature control method for the alkaline electrolysis system further includes: The pressure sensor is controlled to continuously collect the pressure inside the heat exchange medium storage container; When the pressure is less than the preset lower pressure threshold, the sixth switch valve is controlled to close, the fifth switch valve is controlled to open, and the heat exchange medium steam storage container is controlled to introduce the steam of the saturated heat exchange medium into the heat exchange medium storage container until the pressure is not less than the preset lower pressure threshold. When the pressure is not less than the preset lower pressure threshold and not greater than the preset upper pressure threshold, the sixth switching valve and the fifth switching valve are controlled to close. When the pressure exceeds the preset pressure upper limit threshold, the sixth switch valve is controlled to close, the fifth switch valve is controlled to open, and the heat exchange medium steam storage container is controlled to draw in the steam of the heat exchange medium in the heat exchange medium storage container until the pressure does not exceed the preset pressure upper limit threshold.

8. The temperature control method for the alkaline electrolysis system according to claim 6, characterized in that, The electrolysis circuit includes: Alkaline electrolytic reactor, anode main gas-liquid separator, cathode main gas-liquid separator, alkaline solution circulation pump, alkaline solution mixing container, alkaline solution temperature sensor, alkaline solution flow rate sensor, and water replenishment device. The alkali outlet of the alkali heat exchanger is connected to the inlet of the alkali circulation pump via a pipeline. The outlet of the alkali circulation pump is connected to the positive electrode inlet of the alkaline electrolytic reactor via a pipeline. The outlet of the alkali circulation pump is also connected to the negative electrode inlet of the alkaline electrolytic reactor via a pipeline. The positive electrode liquid-gas outlet of the alkaline electrolytic reactor is connected to the inlet of the anode main gas-liquid separator via a pipeline. The alkali outlet of the anode main gas-liquid separator is connected to the first inlet of the alkali mixing container via a pipeline. The cathode liquid-gas outlet of the alkaline electrolytic reactor is connected to the inlet of the cathode main gas-liquid separator via a pipeline. The alkali outlet of the cathode main gas-liquid separator is connected to the second inlet of the alkali mixing container via a pipeline. The outlet of the alkali mixing container is connected to the alkali inlet of the alkali heat exchanger via a pipeline. The liquid outlet of the water replenishment device is connected to the water replenishment port of the cathode main gas-liquid separator via a pipeline. The alkali temperature sensor and the alkali flow rate sensor are installed in the pipeline between the alkali mixing container and the alkali heat exchanger; Both the alkaline solution temperature sensor and the alkaline solution flow rate sensor are communicatively connected to the controller. The step of controlling the heat exchange medium circulation pump to pump the vapor of the saturated heat exchange medium in the heat exchange medium storage container into the alkali heat exchanger of the electrolysis circuit based on the current alkali solution temperature and the current alkali solution flow rate includes: Find a first heat exchange flow rate that matches the current alkali solution temperature and the current alkali solution flow rate, and control the heat exchange medium circulation pump based on the first heat exchange flow rate to pump the vapor of the saturated heat exchange medium into the alkali solution heat exchanger.

9. The temperature control method for the alkaline electrolysis system according to claim 8, characterized in that, The step of controlling the heat exchange medium circulation pump to pump the saturated heat exchange medium in the heat exchange medium storage container into the alkali heat exchanger based on the current alkali solution temperature and the current alkali solution flow rate includes: Find a second heat exchange flow rate that matches the current alkali solution temperature and the current alkali solution flow rate, and control the heat exchange medium circulation pump to pump the saturated heat exchange medium into the alkali solution heat exchanger based on the second heat exchange flow rate.

10. The temperature control method for the alkaline electrolysis system according to claim 6, characterized in that, Determining the operating status of the electrolysis circuit based on the current alkali solution temperature includes: When the current alkaline solution temperature is lower than the lower limit of the preset stable electrolysis temperature range, the operating state, which indicates that the electrolysis circuit is in the heating operation state, is output. When the current alkali solution temperature is greater than the upper limit of the preset stable electrolysis temperature range, the operating state, which indicates that the electrolysis circuit is in the cooling operation state, is output.

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