A temperature control system for electrolytic cell for producing hydrogen by electrolysis of water

Abstract

The present invention discloses a temperature control system for an electrolytic cell for producing hydrogen by electrolysis of water, which comprises a heat storage unit, in which a heat medium is arranged, and the heat medium recovers the waste heat of the electrolytic cell or heats the electrolyte of the electrolytic cell to a set temperature through a heat storage pipeline; a refrigeration unit, in which a refrigerant is arranged, and the refrigerant cools the electrolyte of the electrolytic cell to a suitable temperature through a cooling pipeline; a waste heat utilization unit, in which an external heat source is connected to the waste heat utilization unit, and the waste heat utilization unit uses a heating pipeline to heat the heat exchange medium to a set temperature through a heat exchanger and then transports it to the heat storage unit for storage; a heat exchange unit, which is used to reduce or increase the temperature of the alkali solution. The temperature control system for an electrolytic cell for producing hydrogen by electrolysis of water of the present invention utilizes the waste heat of surrounding factories, the waste heat of the electrolytic cell and an external cold source, and can achieve that the temperature of the electrolytic cell is kept within a constant range, reduce the energy consumption of the process of generating hydrogen by renewable energy, and improve the adaptability and stability of the operation of the electrolytic cell.

Description

Technical Field

[0001] The invention relates to the technical field of water electrolysis hydrogen production, and in particular to a water electrolysis hydrogen production electrolytic cell temperature control system. Background Art

[0002] Traditional hydrogen production through water electrolysis consumes a lot of energy. However, producing hydrogen through electricity generation from renewable energy can not only achieve "zero carbon emissions" and obtain truly clean "green hydrogen", but also convert and store intermittent and unstable renewable energy into chemical energy, promote the consumption of new energy electricity, and bring immeasurable ecological and economic benefits.

[0003] Traditional water electrolysis for hydrogen production needs to be operated at a stable power, and the temperature of the electrolyte in the electrolyzer is generally maintained at 70-80°C. However, the power of renewable energy generation is highly volatile and intermittent, and it is not easy to keep the electrolyte at 70-80°C when using renewable energy to electrolyze water for hydrogen production. If the electrolyzer can be kept at a constant temperature by using the waste heat of the surrounding energy system or the electrolyzer itself, the energy consumption of the renewable energy power generation and hydrogen production process can be reduced, and the adaptability and stability of the electrolyzer operation can be improved.

[0004] For example, Chinese patent document CN216141634U relates to an electrolyte temperature control system suitable for producing hydrogen by alkaline water electrolysis. The system proposes the setting of heat source and cold source but does not provide a specific heat exchange design, and does not have a heat storage device. It is difficult to cope with the situation where the heat source and the electrolysis load do not match, and it is difficult to achieve the ideal effect in practical applications.

[0005] The waste heat recovery method proposed in the Chinese patent document CN216107235U, a waste heat recovery process system for a large-scale alkaline water electrolysis hydrogen production device, does not have a heat storage function and cannot preserve waste heat for a long time. If the electrolytic cells are all under low load, the method is difficult to work.

[0006] Although the Chinese patent document CN213013112U attempts to recover the waste heat from the electrolyzer in a comprehensive thermal management system for a large alkaline water electrolysis hydrogen production device, the process structure is complex and the number of heat exchangers is large. Since there is no external heat source, it is not suitable for renewable energy power generation and hydrogen production, and cannot maintain the electrolyzer temperature under long-term low load conditions. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies in the electrolyte temperature control in the existing process of electrolyzing water to produce hydrogen by using renewable energy for power generation, and to provide a temperature control system for an electrolytic cell for electrolyzing water to produce hydrogen, which has a simple structure, low cost, and can realize the recovery of waste heat from the electrolytic cell and the recovery of waste heat from surrounding factories.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A temperature control system for an electrolytic cell for producing hydrogen by electrolysis of water, comprising:

[0010] A heat storage unit is provided with a heat medium, which is generally water at room temperature or high temperature water, and is used to recover the waste heat of the electrolytic cell or heat the electrolyte of the electrolytic cell to a set temperature through a heat storage pipeline;

[0011] A refrigeration unit, wherein a refrigerant is provided in the refrigeration unit, and the refrigerant is generally cooling water of a chiller, and the electrolyte of the electrolytic cell is cooled to a suitable temperature through a cooling pipeline;

[0012] A waste heat utilization unit, wherein the waste heat utilization unit is connected to an external heat source and uses a heating pipeline to heat the heat exchange medium to a set temperature through a heat exchanger and then transport it to a heat storage unit for storage;

[0013] A heat exchange unit, the heat exchange unit includes a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are respectively arranged in a first gas-liquid separator and a second gas-liquid separator at the liquid outlet of the electrolyzer, and the heat exchange medium outlet and inlet of the first heat exchanger and the second heat exchanger are respectively connected to the heat exchange medium outlet and inlet of the heat storage unit and the refrigeration unit by pipelines to form a heat medium circulation channel suitable for controlling on and off.

[0014] Preferably, the heat storage unit comprises a first heat storage outlet, a second heat storage outlet and a heat storage inlet, and the heat storage inlet and the first heat storage outlet are respectively connected to the heat exchange medium outlet and the heat exchange medium inlet of the heat exchange unit through pipelines; the heat storage inlet and the second heat storage outlet are respectively connected to the heat exchange medium outlet and the heat exchange medium inlet of the waste heat utilization unit through pipelines.

[0015] Preferably, the heat storage unit is a normal pressure heat storage tower.

[0016] Preferably, the refrigeration unit is a normal temperature water-cooled chiller.

[0017] Preferably, the waste heat utilization unit includes a third heat exchanger.

[0018] Preferably, the alkali liquid of the electrolytic cell forms an alkali liquid circulation with the first gas-liquid separator and the second gas-liquid separator through a first circulation pump; the heat exchange medium of the heat storage unit and the refrigeration unit forms a heat exchange medium circulation through a second circulation pump; the heat exchange medium of the heat storage unit and the waste heat utilization unit forms a heat exchange medium circulation through a third circulation pump.

[0019] Preferably, a first regulating valve and a second regulating valve for regulating the flow rate of the pumped liquid are respectively provided at the outlets of the second circulating pump and the third circulating pump.

[0020] Preferably, the refrigeration outlet and the refrigeration inlet of the refrigeration unit are respectively provided with a first stop valve and a second stop valve; the first heat storage outlet, the second heat storage outlet and the heat storage inlet of the heat storage unit are respectively provided with a third stop valve, a fourth stop valve and a fifth stop valve; and the heat exchange medium inlet pipeline of the third heat exchanger is provided with a sixth stop valve.

[0021] Preferably, the first heat storage outlet of the heat storage unit is connected to the inlet of the third stop valve, the second circulation pump and the first regulating valve in sequence through pipelines, and the outlet of the first regulating valve is connected to the heat exchange medium inlet of the first heat exchanger and the second heat exchanger; the inlet of the first stop valve is connected to the refrigeration outlet of the refrigeration unit, and the outlet of the first stop valve is connected to the inlet of the second circulation pump; the heat exchange medium outlets of the first heat exchanger and the second heat exchanger are connected to the inlet of the sixth stop valve through a pipeline, and the outlet of the sixth stop valve is connected to the heat exchange medium inlet of the third heat exchanger through a first branch pipeline, and the heat exchange medium outlet of the third heat exchanger is connected to the heat exchange medium outlet of the heat storage unit through the fifth stop valve. heat storage inlet; the refrigeration inlet of the refrigeration unit is connected to the heat exchange medium outlets of the first heat exchanger and the second heat exchanger through the second stop valve; the second heat storage outlet of the heat storage unit is connected to the fourth stop valve, the third circulation pump, and the inlet of the second regulating valve in sequence through a pipeline, and the outlet of the second regulating valve is connected to the heat exchange medium inlet of the third heat exchanger; the alkali liquid outlets of the first gas-liquid separator and the second gas-liquid separator are both connected to the inlet of the first circulation pump, the outlet of the first circulation pump is connected to the alkali liquid inlet of the electrolyzer, the first alkali liquid outlet of the electrolyzer is connected to the alkali liquid inlet of the first gas-liquid separator, and the second alkali liquid outlet of the electrolyzer is connected to the alkali liquid inlet of the second gas-liquid separator.

[0022] Preferably, temperature sensors are provided at the alkali solution inlet and outlet of the electrolytic cell and in the heat storage unit.

[0023] Beneficial effects of the present invention:

[0024] The temperature control system of the electrolytic cell for producing hydrogen by electrolysis of water of the present invention utilizes waste heat from surrounding factories, residual heat from the electrolytic cell and an external cold source, and can timely adjust the amount of heating or cooling, so as to achieve that the temperature of the electrolytic cell is kept within a constant range, reduce the energy consumption of the process of producing hydrogen by renewable energy power generation, shorten the electrolyte preheating time, and improve the adaptability and stability of the operation of the electrolytic cell. By controlling the switching of each valve, the circuit can be controlled to cope with various working conditions.

[0025] The temperature control system of the electrolytic cell for producing hydrogen by electrolysis of water of the present invention realizes the decoupling between the external heating and the heat load of the electrolytic cell by being equipped with a heat storage unit, and can realize the smooth switching control between the two working conditions of waste heat recovery and external heating based on the same process. The temperature control system has a heat storage unit and a refrigeration unit, which can timely adjust the heating or cooling capacity when the power generation of renewable energy fluctuates, and has a simple structure and is easy to integrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 It is a schematic diagram of the principle of the temperature control system of the electrolytic cell for producing hydrogen by electrolysis of water according to the present invention;

[0028] Figure 2 It is a schematic diagram of the pipeline connection between the heat storage unit, the electrolyzer, and the heat exchange unit;

[0029] Figure 3 It is a schematic diagram of the piping connection between the refrigeration unit, the electrolytic cell, and the heat exchange unit;

[0030] Figure 4 It is a schematic diagram of the pipeline connection between the heat storage unit and the waste heat utilization unit.

[0031] The reference numerals in the figure represent:

[0032] 1-heat storage unit; 11-first heat storage outlet; 12-second heat storage outlet; 13-heat storage inlet; 2-electrolyzer; 21-first gas-liquid separator; 22-second gas-liquid separator; 211, 221-alkali liquid outlet; 23, 212, 222-alkali liquid inlet; 24-first alkali liquid outlet; 25-second alkali liquid outlet; 3-refrigeration unit; 31-refrigeration inlet; 32-refrigeration outlet; 4-waste heat utilization unit; 40-third heat exchanger; 51-first heat exchanger; 52-second heat exchanger; 41, 511, 521-heat exchange medium outlet; 42, 512, 522-heat exchange medium inlet; 61-first circulation pump; 62-second circulation pump; 63-third circulation pump; 71-first regulating valve; 72-second regulating valve; 81-first stop valve; 82-second stop valve; 83-third stop valve; 84-fourth stop valve; 85-fifth stop valve; 86-sixth stop valve; 91-first branch pipeline; 92 second branch pipeline. DETAILED DESCRIPTION

[0033] See also Figure 1 , a temperature control system for an electrolytic cell for producing hydrogen by electrolysis of water according to an embodiment of the present invention comprises

[0034] A heat storage unit 1 is provided with a heat medium, which is generally room temperature water or high temperature water. The heat medium recovers the waste heat of the electrolytic cell 2 through a heat storage pipeline or heats the electrolyte (alkaline solution) of the electrolytic cell 2 to a set temperature; the heat storage unit is preferably a normal pressure heat storage tower.

[0035] A refrigeration unit 3 is provided with a refrigerant, which is generally cooling water from a chiller. The refrigerant cools the electrolyte in the electrolytic cell to a suitable temperature through a cooling pipeline; the refrigeration unit is preferably a normal temperature water-cooled chiller.

[0036] The waste heat utilization unit 4 is connected to an external heat source, which comes from waste heat generated by other surrounding factories (such as chemical plants, cement plants, smelters, etc.). The waste heat utilization unit 4 uses a heating pipeline to heat the heat exchange medium to a set temperature through a heat exchanger and then transports it to the heat storage unit for storage;

[0037] The heat exchange unit includes a first heat exchanger 51 and a second heat exchanger 52. The first heat exchanger 51 and the second heat exchanger 52 are respectively arranged in the first gas-liquid separator 21 and the second gas-liquid separator 22 at the liquid outlet of the electrolytic cell 2. The heat exchange medium inlet and outlet of the first heat exchanger 51 and the second heat exchanger 52 are respectively connected to the heat exchange medium inlet and outlet of the heat storage unit 1 and the refrigeration unit 3 by pipelines to form a heat medium circulation channel suitable for controlling on and off.

[0038] The heat storage unit 1 of this embodiment includes a first heat storage outlet 11, a second heat storage outlet 12 and a heat storage inlet 13. The heat storage inlet 13 and the first heat storage outlet 11 are respectively connected to the heat exchange medium outlet 511, 521 and the heat exchange medium inlet 512, 522 of the heat exchange unit through pipelines; the heat storage inlet 13 and the second heat storage outlet 12 are respectively connected to the heat exchange medium outlet 41 and the heat exchange medium inlet 42 of the waste heat utilization unit 4 through pipelines.

[0039] The waste heat utilization unit has a third heat exchanger 40 built therein, and the waste heat utilization unit heats the heat exchange medium flowing into the tube of the third heat exchanger 40 by utilizing waste heat from a peripheral factory.

[0040] In this embodiment, the alkali liquid of the electrolytic cell 2 forms an alkali liquid circulation with the first gas-liquid separator 21 and the second gas-liquid separator 22 through the first circulation pump 61; the heat exchange medium of the heat storage unit 1 and the refrigeration unit 3 forms a heat exchange medium circulation through the second circulation pump 62; the heat exchange medium of the heat storage unit 1 and the waste heat utilization unit 4 forms a heat exchange medium circulation through the third circulation pump 63.

[0041] In this embodiment, a first regulating valve 71 and a second regulating valve 72 for regulating the flow rate of the pumped liquid are respectively disposed at the outlets of the second circulating pump 62 and the third circulating pump 63 .

[0042] See also Figure 1 In this embodiment, the refrigeration outlet 32 ​​and the refrigeration inlet 31 of the refrigeration unit 1 are respectively provided with a first stop valve 81 and a second stop valve 82; the first heat storage outlet 11, the second heat storage outlet 12 and the heat storage inlet 13 of the heat storage unit 1 are respectively provided with a third stop valve 83, a fourth stop valve 84 and a fifth stop valve 85; the heat exchange medium inlet pipeline of the third heat exchanger is provided with a sixth stop valve 86.

[0043] The specific pipe connections between the units are as follows:

[0044] See also Figure 1 , Figure 2 The first heat storage outlet 11 of the heat storage unit 1 is connected to the inlet of the third stop valve 83, the second circulation pump 62, and the first regulating valve 71 in sequence through pipelines, and the outlet of the first regulating valve 71 is connected to the heat exchange medium inlets 512 and 522 of the first heat exchanger 51 and the second heat exchanger 52; the heat exchange medium outlets 511 and 521 of the first heat exchanger 51 and the second heat exchanger 52 are connected to the inlet of the sixth stop valve 86 through pipelines, and the outlet of the sixth stop valve 86 is connected to the heat exchange medium inlet 42 of the third heat exchanger 40 through a first branch pipeline 91, and the heat exchange medium outlet 41 of the third heat exchanger 40 is connected to the heat storage inlet 13 of the heat storage unit 1 through the fifth stop valve 85.

[0045] See also Figure 1 , Figure 3 The refrigeration inlet 31 of the refrigeration unit 3 is connected to the heat exchange medium outlets 511 and 521 of the first heat exchanger 51 and the second heat exchanger 52 through the second stop valve 82, the inlet of the first stop valve 81 is connected to the refrigeration outlet 32 ​​of the refrigeration unit 3, the outlet of the first stop valve 81 is connected to the inlet of the second circulation pump 62, and then guided to the heat exchange medium inlets 512 and 522 of the first heat exchanger and the second heat exchanger through the first regulating valve 71.

[0046] See also Figure 1 , Figure 4The second heat storage outlet 12 of the heat storage unit 1 is connected to the fourth stop valve 84, the third circulation pump 63, and the inlet of the second regulating valve 72 in sequence through pipelines. The outlet of the second regulating valve 72 is connected to the heat exchange medium inlet 42 of the third heat exchanger 40 through a second branch pipeline 92, and then conducted to the heat storage unit through the heat exchange medium outlet 41 of the third heat exchanger, the fifth stop valve 85, and the heat storage inlet 13.

[0047] See also Figure 1 The alkali liquid outlets 211 and 221 of the first gas-liquid separator 21 and the second gas-liquid separator 22 are both connected to the inlet of the first circulation pump 61, the outlet of the first circulation pump 61 is connected to the alkali liquid inlet 23 of the electrolytic cell 2, the first alkali liquid outlet 24 of the electrolytic cell 2 is connected to the alkali liquid inlet 212 of the first gas-liquid separator 21, and the second alkali liquid outlet 25 of the electrolytic cell is connected to the alkali liquid inlet 222 of the second gas-liquid separator 22; the first gas-liquid separator is used to separate hydrogen, and the second gas-liquid separator is used to separate oxygen.

[0048] In this embodiment, the alkali solution inlet and outlet of the electrolytic cell 2 and the heat storage unit 1 are all provided with temperature sensors (not shown in the figure) for real-time monitoring of relevant temperatures to improve the stability of hydrogen electrolysis.

[0049] The process of the alkali liquid circulation for producing hydrogen by electrolysis of water, after the alkali liquid separates hydrogen and oxygen in the gas-liquid separator, it converges in the connecting pipe at the bottom of the two gas-liquid separators, enters the first circulation pump 61, is forced to circulate by the pump, and returns to the electrolyzer after pressurization. In the electrolyzer, after the alkali liquid is electrolyzed in each electrolysis chamber, it enters the hydrogen channel or oxygen channel from each outlet respectively together with the hydrogen or oxygen produced by the electrolysis, and then enters the first gas-liquid separator and the second gas-liquid separator respectively, thereby forming a complete alkali liquid circulation system. The temperature of the alkali liquid can represent the temperature in the electrolyzer to a certain extent, so controlling the temperature of the alkali liquid to remain within a certain range can indirectly control the temperature in the electrolyzer. Therefore, temperature sensors are set before and after the electrolyzer to detect the temperature of the alkali liquid and set a heat exchanger in the gas-liquid separator to control the temperature of the alkali liquid, so as to maintain the constant temperature of the electrolyzer.

[0050] The working principle of the above-mentioned water electrolysis hydrogen production electrolyzer temperature control system is as follows:

[0051] See also Figure 1 , Figure 2, when the temperature of the electrolytic cell is higher than 80°C, the system starts to run. When the system is initially running, the liquid filled in the heat storage unit 1 is a room temperature liquid. At this time, the third stop valve 83, the fifth stop valve 85 and the sixth stop valve 86 are opened, and the remaining stop valves are closed. The second circulation pump 62 extracts the liquid in the heat storage unit through the first heat storage outlet 11, and the liquid flow is controlled by the first regulating valve 71. After the alkali liquid is cooled by the first heat exchanger 51 and the second heat exchanger 52, it flows out. The liquid is then heated by the third heat exchanger 40 and returned to the tank of the heat storage unit through the heat storage inlet. When the temperature in the heat storage unit is greater than 50°C, this process ends. This process is the electrolytic cell waste heat recovery process during initial operation.

[0052] When the temperature in front of the electrolytic cell is less than 70°C, the third stop valve 83, the fifth stop valve 85 and the sixth stop valve 86 are opened, and the remaining stop valves are closed. The second circulation pump 62 extracts the hot liquid in the heat storage unit through the first heat storage outlet 11 of the heat storage unit, and the liquid flow is regulated by the first regulating valve. After the alkali liquid is heated by the first heat exchanger and the second heat exchanger, it is directed to the third heat exchanger to further heat the liquid to 90°C and then return to the heat storage unit through the heat storage inlet of the heat storage unit. When the alkali liquid temperature is greater than 75°C, this process ends. This process is the process of heating the alkali liquid.

[0053] See also Figure 1 , Figure 3 When the temperature after the electrolytic cell is greater than 80°C, open the first stop valve 81 and the second stop valve 82, and close the remaining stop valves. The second circulating pump 62 extracts the cold liquid in the refrigeration unit 3, and after the liquid flow is adjusted by the first regulating valve, the alkali liquid is cooled and returned to the refrigeration unit through the first heat exchanger in the first gas-liquid separator and the second heat exchanger in the second gas-liquid separator. The refrigeration unit will cool the liquid again. When the alkali liquid temperature is less than 75°C, this process ends. This process is the process of cooling the alkali liquid.

[0054] See also Figure 1 , Figure 4 When the average temperature of the hot liquid in the heat storage unit is lower than 85°C, the fourth stop valve 84 and the fifth valve 85 are opened, and the sixth valve is closed. The third circulation pump 63 draws the liquid out of the heat storage unit through the second water outlet 12 of the heat storage tank, and the liquid flow rate is controlled by the second regulating valve 72. After being heated to 90°C by the second heat exchanger, it enters the heat storage unit through the heat storage inlet 13 to maintain the hot liquid temperature. This process is the heat storage tank liquid reheating process.

[0055] Table 1 below shows the switch status of each valve, circulating pump, and refrigeration equipment in the thermostatic device of the electrolytic cell for hydrogen production by electrolysis of water, in four cases: electrolytic cell waste heat recovery or heating of alkali solution, cooling of alkali solution, and reheating of liquid in the heat storage tank:

[0056]

[0057] The above specific implementation methods are only detailed explanations of the technical solutions of the present invention. The present invention is not limited to the above embodiments. Those skilled in the art should understand that any improvements and substitutions based on the above principles and spirits on the basis of the present invention should be within the protection scope of the present invention.

Claims

1. A temperature control system for an electrolytic cell for producing hydrogen by electrolysis of water, characterized in that include: A heat storage unit, wherein a heat medium is arranged in the heat storage unit, and waste heat of the electrolytic cell is recovered through a heat storage pipeline or the electrolyte of the electrolytic cell is heated to a set temperature; A refrigeration unit, wherein a refrigerant is provided in the refrigeration unit and the electrolyte in the electrolytic cell is cooled to a suitable temperature through a cooling pipeline; A waste heat utilization unit, wherein the waste heat utilization unit is connected to an external heat source and uses a heating pipeline to heat the heat exchange medium to a set temperature through a heat exchanger and then transport it to a heat storage unit for storage; A heat exchange unit, the heat exchange unit comprising a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are respectively arranged in a first gas-liquid separator and a second gas-liquid separator at the liquid outlet of the electrolyzer, and the heat exchange medium outlet and inlet of the first heat exchanger and the second heat exchanger are respectively connected with the heat exchange medium outlet and inlet of the heat storage unit and the refrigeration unit through pipes to form a heat medium circulation channel suitable for controlling on and off; Wherein, the waste heat utilization unit comprises a third heat exchanger; The alkali liquid of the electrolytic cell forms an alkali liquid circulation with the first gas-liquid separator and the second gas-liquid separator through the first circulation pump; the heat exchange medium of the heat storage unit and the refrigeration unit forms a heat exchange medium circulation through the second circulation pump; the heat exchange medium of the heat storage unit and the waste heat utilization unit forms a heat exchange medium circulation through the third circulation pump; A first regulating valve and a second regulating valve for regulating the flow rate of the pumped liquid are respectively arranged at the outlets of the second circulating pump and the third circulating pump; The refrigeration outlet and the refrigeration inlet of the refrigeration unit are respectively provided with a first stop valve and a second stop valve; the first heat storage outlet, the second heat storage outlet and the heat storage inlet of the heat storage unit are respectively provided with a third stop valve, a fourth stop valve and a fifth stop valve; the heat exchange medium inlet pipeline of the third heat exchanger is provided with a sixth stop valve; The first heat storage outlet of the heat storage unit is connected to the inlet of the third stop valve, the second circulation pump, and the first regulating valve in sequence through pipelines, and the outlet of the first regulating valve is connected to the heat exchange medium inlet of the first heat exchanger and the second heat exchanger; the inlet of the first stop valve is connected to the refrigeration outlet of the refrigeration unit, and the outlet of the first stop valve is connected to the inlet of the second circulation pump; the heat exchange medium outlets of the first heat exchanger and the second heat exchanger are connected to the inlet of the sixth stop valve through a pipeline, and the outlet of the sixth stop valve is connected to the heat exchange medium inlet of the third heat exchanger through a first branch pipeline, and the heat exchange medium outlet of the third heat exchanger is connected to the heat storage medium inlet of the heat storage unit through the fifth stop valve. inlet; the refrigeration inlet of the refrigeration unit is connected to the heat exchange medium outlets of the first heat exchanger and the second heat exchanger through the second stop valve; the second heat storage outlet of the heat storage unit is connected to the fourth stop valve, the third circulation pump, and the inlet of the second regulating valve in sequence through a pipeline, and the outlet of the second regulating valve is connected to the heat exchange medium inlet of the third heat exchanger; the alkali liquid outlets of the first gas-liquid separator and the second gas-liquid separator are both connected to the inlet of the first circulation pump, the outlet of the first circulation pump is connected to the alkali liquid inlet of the electrolyzer, the first alkali liquid outlet of the electrolyzer is connected to the alkali liquid inlet of the first gas-liquid separator, and the second alkali liquid outlet of the electrolyzer is connected to the alkali liquid inlet of the second gas-liquid separator.

2. The temperature control system for the electrolytic cell for producing hydrogen by electrolysis of water according to claim 1, characterized in that: The heat storage unit comprises a first heat storage outlet, a second heat storage outlet and a heat storage inlet, and the heat storage inlet and the first heat storage outlet are respectively connected to the heat exchange medium outlet and the heat exchange medium inlet of the heat exchange unit through pipelines; the heat storage inlet and the second heat storage outlet are respectively connected to the heat exchange medium outlet and the heat exchange medium inlet of the waste heat utilization unit through pipelines.

3. The temperature control system for the electrolytic cell for producing hydrogen by electrolysis of water according to claim 2, characterized in that: The heat storage unit is a normal pressure heat storage tower.

4. The temperature control system for the electrolytic cell for producing hydrogen by electrolysis of water according to any one of claims 1 to 3, characterized in that: The refrigeration unit is a normal temperature water-cooled chiller.

5. The temperature control system for the electrolytic cell for producing hydrogen by electrolysis of water according to claim 1, characterized in that: Temperature sensors are arranged at the alkali solution inlet and outlet of the electrolytic cell and in the heat storage unit.

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