Water replenishing and temperature controlling device for alkaline electrolytic cell

Abstract

The utility model discloses a water replenishing and temperature controlling device for an alkaline electrolytic bath. The water replenishing and temperature controlling device comprises the electrolytic bath, a gas-liquid separation device, a water replenishing and temperature controlling system and an alkaline liquor circulating system, the gas-liquid separation device is respectively connected with a hydrogen side outlet and an oxygen side outlet of the electrolytic bath; the water supplementing temperature control system is connected with the gas-liquid separation device and the alkali liquor circulation system and used for heating deionized water till the temperature difference between the deionized water and alkali liquor in the alkali liquor circulation system is smaller than the set temperature, inputting the deionized water into the gas-liquid separation device, and feeding the deionized water into the gas-liquid separation device after the deionized water penetrates through hydrogen and oxygen separated from the gas-liquid separation device. Inputting into an alkali liquor circulating system; and the alkali liquor circulating system is connected with the gas-liquid separation device and the electrolytic bath, and is used for conveying alkali liquor and deionized water in the gas-liquid separation device to the electrolytic bath after exchanging heat with the alkali liquor heat exchanger. According to the utility model, the electrolytic bath can be conveniently supplemented with liquid, the temperature fluctuation in the electrolytic bath can be reduced, and the investment cost of equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of electrolytic cells, in particular to a water replenishing and temperature controlling device for an alkaline electrolytic cell. Background Art

[0002] The alkaline electrolyzer hydrogen production system mainly includes an alkaline electrolyzer, a gas-liquid separation device, a cooler, a drip collector, an alkaline solution cooler, an alkaline solution circulation pump, a water tank, a DC power supply, a control cabinet, etc. The alkaline electrolyzer will continuously generate heat during actual operation. Therefore, in order to control the operating temperature of the alkaline electrolyzer, an alkaline solution circulation system and an alkaline solution cooler are equipped to enable the alkaline electrolyzer to operate at a stable temperature (85-95°C). However, the alkaline electrolyzer will continue to consume deionized water during operation, so the electrolyzer hydrogen production system needs to be equipped with a water replenishment system with a flow rate of 1000Nm 3 Taking an electrolyzer producing H2 / h as an example, the mass of water consumed per hour is about 803kg. The deionized water supplied to the electrolyzer through the water supply system is at room temperature, while the operating temperature of the alkaline electrolyzer is 90°C. Therefore, in the actual water supply process, the high-temperature alkali solution in the electrolyzer will become unstable in temperature when adding room-temperature deionized water, and thus the electrolyzer will have unstable operating power. In addition, when the electrolyzer is in a hot standby state, it is necessary to use an external heat source to properly preheat the alkali solution. Therefore, the hydrogen production system usually needs to be equipped with a steam heat exchanger. The alkali solution heating process is uncontrollable and the equipment investment is high. In order to solve the power fluctuation and alkali solution preheating problems caused by water supply during the operation of the alkaline electrolyzer, this utility model patent proposes an alkaline electrolyzer water supply and temperature control device. Utility Model Content

[0003] In order to solve the deficiencies in the prior art, the utility model provides an alkaline electrolytic cell water replenishment and temperature control device, which is convenient for replenishing the electrolytic cell, can reduce the temperature fluctuation inside the electrolytic cell, and reduce the investment cost of the equipment.

[0004] The utility model adopts the following technical solutions.

[0005] The utility model provides an electrolytic cell water supply and temperature control device, comprising: an electrolytic cell and a gas-liquid separation device, wherein the gas-liquid separation device is respectively connected to the hydrogen side outlet and the oxygen side outlet of the electrolytic cell and is used to separate hydrogen and oxygen from alkali solution respectively; the alkaline electrolytic cell water supply and temperature control device also comprises: a water supply and temperature control system and an alkali solution circulation system; the water supply and temperature control system is connected to the gas-liquid separation device and the alkali solution circulation system and is used to heat deionized water until the temperature difference between the water supply and the alkali solution in the alkali solution circulation system is less than a set temperature, and then input the deionized water into the gas-liquid separation device, and after the deionized water passes through the hydrogen and oxygen separated by the gas-liquid separation device, input the deionized water into the alkali solution circulation system; the alkali solution circulation system is connected to the gas-liquid separation device and the electrolytic cell and is used to heat the alkali solution in the gas-liquid separation device and the deionized water with an alkali solution heat exchanger and then transport them to the electrolytic cell.

[0006] Preferably, the gas-liquid separation device includes: a hydrogen separator and an oxygen separator; the hydrogen separator is connected to the hydrogen side outlet of the electrolyzer, and is used to separate hydrogen from the alkali liquid, the gas outlet of the hydrogen separator is connected to the hydrogen droplet catcher, and the liquid outlet is connected to the alkali liquid circulation system; the oxygen separator is connected to the oxygen side outlet of the electrolyzer, and is used to separate oxygen from the alkali liquid; the gas outlet of the oxygen separator is connected to the oxygen droplet catcher, and the liquid outlet is connected to the alkali liquid circulation system.

[0007] Preferably, the gas-liquid separation device further comprises: a hydrogen cooler and an oxygen cooler; the hydrogen cooler is connected to the hydrogen droplet catcher; and the oxygen cooler is connected to the oxygen droplet catcher.

[0008] Preferably, the alkali liquid circulation system includes: an alkali liquid circulation pump, an alkali liquid heat exchanger and a filter; the inlet of the alkali liquid circulation pump is connected to the liquid outlet of the gas-liquid separation device, and the outlet of the alkali liquid circulation pump is connected to the first inlet of the alkali liquid heat exchanger; the first outlet of the alkali liquid heat exchanger is connected to the inlet of the filter, and the outlet of the filter is connected to the alkali liquid inlet of the electrolytic cell; the second inlet of the alkali liquid heat exchanger is connected to the first pipe for passing cooling water or heated deionized water; the second outlet of the alkali liquid heat exchanger is connected to the second pipe for discharging cooling water or returning deionized water to the deionized water tank in the water replenishment and temperature control system.

[0009] Preferably, the first pipeline is provided with a fifth valve; the second pipeline is provided with a fourth valve.

[0010] Preferably, the water replenishment and temperature control system includes: a deionized water tank, a water replenishment pump, an electric heating device and a temperature control system; the outlet of the deionized water tank is connected to the inlet of the water replenishment pump, the outlet of the water replenishment pump is connected to the inlet of the electric heating device, the outlet of the electric heating device is connected to the inlets of the hydrogen droplet catcher and the oxygen droplet catcher through a fourth pipe, and the outlets of the hydrogen droplet catcher and the oxygen droplet catcher are connected to the gas-liquid separation device; the temperature control system is connected to the electric heating device and the alkali solution circulation system, and is used to control the electric heating device to stop heating after the deionized water is heated to a temperature difference between the deionized water and the alkali solution in the alkali solution circulation system is less than a set temperature.

[0011] Preferably, the temperature control system includes: a first temperature measuring device, a second temperature measuring device and a temperature difference monitoring device; the first temperature measuring device is connected to the electric heating device, and is used to detect the temperature of the deionized water located in the electric heating device; the second temperature measuring device is connected to the filter, and is used to detect the temperature of the alkali solution after filtering through the filter; the temperature difference monitoring device is simultaneously connected to the first temperature measuring device, the second temperature measuring device and the control system, and is used to measure the temperature difference between the measurement values ​​of the first temperature measuring device and the second temperature measuring device; the control system is connected to the electric heating device, and is used to control the switch of the electric heating device according to the temperature difference.

[0012] Preferably, the fourth pipeline is provided with a third valve.

[0013] Preferably, the inlet of the deionized water tank is connected to the second pipe through a third pipe; and the outlet of the electric heating device is further connected to the first pipe through a fifth pipe.

[0014] Preferably, a second valve is provided on the third pipeline; and a first valve is provided on the fifth pipeline.

[0015] The beneficial effects of the present invention are as follows: compared with the prior art, the water replenishment temperature control device provided in the present invention can heat the deionized water until the temperature difference with the alkali solution in the alkali solution circulation system is less than the set temperature, and then replenish the deionized water into the electrolytic cell, thereby reducing the temperature fluctuation caused by the replenishment of the electrolytic cell and reducing the investment cost of the equipment. In addition, the gas separation device provided in the present invention separates hydrogen and oxygen from the alkali solution and then passes the hydrogen and oxygen through the deionized water, thereby reducing the alkaline content of the hydrogen and oxygen, thereby further improving the purification accuracy.

[0016] Furthermore, the utility model is provided with a hydrogen droplet catcher and an oxygen droplet catcher. After being heated, the deionized water first enters the hydrogen droplet catcher and the oxygen droplet catcher to clean the hydrogen droplet catcher, the oxygen droplet catcher and the hydrogen and oxygen, thereby reducing the alkaline content of the hydrogen and oxygen and effectively removing impurities on the droplet catcher screen to reduce the blockage of the droplet catcher screen.

[0017] In addition, the deionized water tank provided in the utility model is also connected to the alkali liquid heat exchanger in the alkali liquid circulation system. The heated deionized water can heat the alkali liquid inside the alkali liquid heat exchanger, thereby achieving a preheating effect, which is beneficial for the electrolytic cell to stably reach a hot standby state and further reduce the temperature fluctuation of the electrolytic cell operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a schematic structural diagram of a water replenishing and temperature controlling device for an alkaline electrolytic cell.

[0019] The accompanying drawings are as follows: 1. deionized water tank; 2. water supply pump; 3. electric heating device; 4. first temperature measuring device; 5. first valve; 6. second valve; 7. third valve; 8. hydrogen cooler; 9. oxygen cooler; 10. hydrogen droplet catcher; 11. oxygen droplet catcher; 12. hydrogen separator; 13. oxygen separator; 14. electrolytic cell; 15. alkali solution circulation pump; 16. alkali solution heat exchanger; 17. filter; 18. fourth valve; 19. fifth valve; 20. temperature difference monitoring device; 21. second temperature measuring device. DETAILED DESCRIPTION

[0020] To make the purpose, technical solution, and advantages of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without making any creative efforts are all within the scope of protection of the present invention.

[0021] like Figure 1 As shown, the utility model provides an alkaline electrolytic cell water replenishment and temperature control device, comprising: an electrolytic cell 14, a gas-liquid separation device, a water replenishment and temperature control system, and an alkaline solution circulation system.

[0022] The electrolytic cell 14 is filled with alkaline solution and an electrolytic device. A hydrogen outlet and an oxygen outlet are provided on the top of the electrolytic cell 14 . Both the hydrogen outlet and the oxygen outlet are connected to a gas-liquid separation device.

[0023] The gas-liquid separation device includes a hydrogen separator 12 and an oxygen separator 13. The hydrogen outlet of the electrolyzer 14 is connected to the hydrogen separator 12, which separates the hydrogen from the alkali solution. The gas outlet of the hydrogen separator 12 is connected to the hydrogen droplet catcher 10, and the liquid outlet is connected to the alkali solution circulation system. The separated hydrogen passes through the hydrogen droplet catcher 10 and enters the hydrogen cooler 8, which can reduce the water content of the hydrogen and further improve the purity of the hydrogen.

[0024] The oxygen outlet of the electrolytic cell 14 is connected to an oxygen separator 13, which separates oxygen from the alkali solution. The gas outlet of the oxygen separator 13 is connected to an oxygen droplet trap 11, and the liquid outlet is connected to the alkali solution circulation system. The separated oxygen passes through the oxygen droplet trap 11 and enters the oxygen cooler 9, reducing the water content and further improving the oxygen purity. The remaining alkali solution in the hydrogen separator 12 and oxygen separator 13 enters the alkali solution circulation system through pipelines.

[0025] The alkali liquid circulation system includes an alkali liquid circulation pump 15, an alkali liquid heat exchanger 16, and a filter 17. The liquid outlets of the hydrogen separator 12 and the oxygen separator 13 are both connected to the inlet of the alkali liquid circulation pump 15. The outlet of the alkali liquid circulation pump 15 is connected to the first inlet of the alkali liquid heat exchanger 16, which is connected to the inlet of the filter 17. The outlet of the filter 17 is connected to the alkali liquid inlet of the electrolytic cell 14. The second inlet of the alkali liquid heat exchanger 16 is connected to the first pipeline for admitting cooling water or heated deionized water. A fifth valve 19 is provided on the first pipeline. The second outlet of the alkali liquid heat exchanger 16 is connected to the second pipeline for discharging cooling water or returning deionized water to the deionized water tank in the water replenishment and temperature control system. A fourth valve 18 is provided on the second pipeline.

[0026] The alkali liquor separated from hydrogen separator 12 and oxygen separator 13 enters alkali liquor heat exchanger 16 driven by alkali liquor circulation pump 15, exchanges heat with cooling water or heated deionized water, and then flows back into electrolytic cell 14, completing the alkali liquor water circulation. Before the electrolytic cell is operated, the alkali liquor is preheated by exchanging heat with heated deionized water. During operation, the alkali liquor is heated by exchanging heat with cooling water to cool the heated alkali liquor back to the required operating temperature.

[0027] The water replenishment and temperature control system includes a deionized water tank 1, a water replenishment pump 2, an electric heater 3, and a temperature control system. The outlet of the deionized water tank 1 is connected to the inlet of the water replenishment pump 2, which is in turn connected to the second pipe via a third pipe, on which a second valve 6 is provided. The outlet of the water replenishment pump 2 is connected to the inlet of the electric heater 3, which is connected to a hydrogen droplet trap 10 and an oxygen droplet trap 11 via a fourth pipe, on which a third valve 7 is provided. The outlet of the electric heater 3 is also connected to the first pipe via a fifth pipe, on which a first valve 5 is provided.

[0028] The deionized water in the deionized water tank 1 is driven by the water supply pump 2 and enters the electric heating device 3. The deionized water is heated by the electric heating device 3 and then input to the hydrogen droplet trap 10 and the oxygen droplet trap 11 through the fourth pipeline. The amount of deionized water input per hour can be determined by monitoring the liquid level of the gas-liquid separation device. For a hydrogen production capacity of 1000 Nm 3 For an alkaline electrolyzer with a flow rate of H2 / h, the mass of deionized water input per hour is 500-1000kg. The deionized water entering the hydrogen drip feeder 10 flows into the hydrogen separator 12 and enters the alkali liquid circulation system along with the alkali liquid separated in the hydrogen separator 12. The deionized water entering the oxygen drip feeder 11 flows into the oxygen separator 13 and enters the alkali liquid circulation system along with the alkali liquid separated in the oxygen separator 13.

[0029] Deionized water can be used to clean the screens inside the hydrogen and oxygen droplet traps 10 and 11, removing impurities from the screens and reducing clogging. Furthermore, the hydrogen separated from the hydrogen separator 12 passes through the deionized water replenished in the hydrogen droplet trap 10 before entering the hydrogen cooler 8. As the hydrogen passes through the deionized water, the deionized water reduces the alkali content in the hydrogen, thereby improving the purity of the separated hydrogen. Similarly, the oxygen separated from the oxygen separator 13 passes through the deionized water replenished in the oxygen droplet trap 11 to reduce the alkali content in the oxygen.

[0030] The temperature control system is connected to the electric heating device 3. The temperature control system is used to monitor the temperature of the deionized water in the electric heating device 3 and control the switch of the electric heating device 3 so that the deionized water is heated to the working temperature of the alkali solution in the electrolytic cell before entering the electrolytic cell for rehydration, thereby reducing temperature fluctuations in the electrolytic cell.

[0031] Furthermore, the temperature control system includes: a first temperature measuring device 4, a second temperature measuring device 21, and a temperature difference monitoring device 20. The first temperature measuring device 4 is connected to the electric heating device 3 and is used to detect the temperature of the deionized water after being heated by the electric heating device 3. The second temperature measuring device 21 is connected to the filter 17 and is used to detect the temperature of the alkali solution after being filtered by the alkali solution filter 17. The temperature difference monitoring device 20 is simultaneously connected to the first temperature measuring device 4, the second temperature measuring device 21, and the control system, and is used to measure the temperature difference between the values ​​measured by the first temperature measuring device 4 and the second temperature measuring device 21. The control system is connected to the electric heating device 3. When the temperature difference monitoring device 20 measures a temperature difference greater than a set temperature, it controls the electric heating device 3 to start, heating the deionized water until the temperature difference is less than the set temperature. The deionized water is then replenished into the hydrogen droplet trap 10 and the oxygen droplet trap 11 via the water replenishment pump 2, and then flows into the electrolytic cell 14. In a preferred embodiment of the present invention, the set temperature is 1°C.

[0032] Before the electrolytic cell 14 is operated, if the alkali solution in the electrolytic cell 14 needs to be preheated, the deionized water can be heated to a suitable temperature by the electric heating device 3, and then the first valve 5 and the second valve 6 can be opened, and the third valve 7, the fourth valve 18, and the fifth valve 19 can be closed. The deionized water heated by the electric heating device 3 can be transported to the interior of the alkali solution heat exchanger 16 through the fifth pipe and the first pipe, and then flowed back to the deionized water tank 1 through the second pipe and the third pipe. At this time, the alkali solution circulation system is opened, and the alkali solution in the electrolytic cell passes through the hydrogen separator 12 and the oxygen separator 13, and enters the alkali solution heat exchanger 16 under the action of the alkali solution circulation pump 15, where it exchanges heat with the heated deionized water, thereby achieving the effect of preheating the alkali solution.

[0033] When the electrolyzer is operating, the first valve 5, second valve 6, and third valve 7 are closed, and the fourth valve 18 and fifth valve 19 are opened. Cooling water is fed into the alkali liquid heat exchanger through the first pipe and then discharged from the alkali liquid heat exchanger 16 through the second pipe. Subsequently, the power supply to the electrolyzer 14 is turned on, and the alkali liquid circulation pump 15 is turned on. The alkali liquid separated from the hydrogen separator 12 and the oxygen separator 13 are transported to the alkali liquid heat exchanger 16 for heat exchange with the cooling water. After cooling to the electrolyzer operating temperature, the alkali liquid is then transported to the electrolyzer 14.

[0034] When the electrolytic cell needs to be replenished with water, the electrolytic cell operates normally, the water replenishment temperature control system and the alkali solution circulation system are started, and the temperature difference monitoring device and the control system are used to control the electric heating device 3 to heat the deionized water until the temperature difference with the circulating alkali solution is less than the set temperature. Then, the third valve 7, the fourth valve 18 and the fifth valve 19 are opened to replenish the deionized water into the electrolytic cell.

[0035] The following is 1Nm 3 A test experiment on the water replenishment and temperature control device of a frame-type alkaline electrolyzer hydrogen production system with a capacity of H2 / h was carried out. The electrolyzer in the frame-type alkaline electrolyzer hydrogen production system was normally opened and allowed to operate stably at 50°C, 60°C, 70°C, 80°C, 90°C, and 95°C, respectively. The temperature of the alkaline electrolyzer was kept stable, and the temperature T of the KOH solution after cooling was recorded by the temperature measuring device. When replenishing water to the alkaline electrolyzer, the temperature difference monitoring device can obtain the temperature T of the KOH solution after cooling and the temperature T1 of the deionized water in the electric heating device. When the temperature difference between the two is greater than 1°C, the interlocking control system controls the heating power of the electric heating device according to the temperature difference, and heats the deionized water at room temperature. When the temperature difference between the temperature T1 of the deionized water in the electric heating device and T is less than 1°C, the water is replenished into the drip collector through the water replenishment pump and flows into the alkaline electrolyzer.

[0036] The following table shows some solutions of the embodiments and comparative examples.

[0037]

[0038] In Examples 1 through 6, heating of the added deionized water before it was fed to the drip trap was implemented, maintaining relatively constant and stable operation of the alkaline electrolytic cell, effectively reducing temperature fluctuations during operation. Comparative Example 1, on the other hand, fed room-temperature deionized water into the scrubber. Compared to Example 5, the electrolytic cell experienced temperature fluctuations during the water replenishment process, which in turn affected the voltage of the electrolytic cell and resulted in temporary instability in the electrolytic cell's operating power.

[0039] In a test experiment of alkali solution preheating using the above-mentioned alkaline electrolyzer hydrogen production system, it is assumed that the electrolyzer needs to reach a hot standby state of 50°C. At this time, a preset alkali solution temperature of 50°C is input into the control system. The control system adjusts the heating power of the electric heating device according to the preset temperature, heats the deionized water at room temperature, and then inputs the deionized water into the alkali solution heat exchanger through the water supply pump to preheat the alkali solution. The deionized water passes through the alkali solution heat exchanger and returns to the deionized water tank until the alkali solution reaches 50°C.

[0040] The beneficial effects of the present invention are as follows: compared with the prior art, the water replenishment temperature control device provided in the present invention can heat the deionized water until the temperature difference with the alkali solution in the alkali solution circulation system is less than the set temperature, and then replenish the deionized water into the electrolytic cell, thereby reducing the temperature fluctuation caused by the replenishment of the electrolytic cell and reducing the investment cost of the equipment. In addition, the gas separation device provided in the present invention separates hydrogen and oxygen from the alkali solution and then passes the hydrogen and oxygen through the deionized water, thereby reducing the alkaline content of the hydrogen and oxygen, thereby further improving the purity.

[0041] Furthermore, the utility model is provided with a hydrogen droplet catcher and an oxygen droplet catcher. After being heated, the deionized water first enters the hydrogen droplet catcher and the oxygen droplet catcher to clean the hydrogen droplet catcher, the oxygen droplet catcher and the hydrogen and oxygen, thereby reducing the alkaline content of the hydrogen and oxygen and effectively removing impurities on the droplet catcher screen to reduce the blockage of the droplet catcher screen.

[0042] In addition, the deionized water tank provided in the utility model is also connected to the alkali liquid heat exchanger in the alkali liquid circulation system. The heated deionized water can heat the alkali liquid inside the alkali liquid heat exchanger, thereby achieving a preheating effect, which is beneficial for the electrolytic cell to stably reach a hot standby state and further reduce the temperature fluctuation of the electrolytic cell operation.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A water replenishment and temperature control device for an alkaline electrolytic cell, comprising: The electrolytic cell (14) and the gas-liquid separation device are characterized by: The gas-liquid separation device is connected to the hydrogen side outlet and the oxygen side outlet of the electrolytic cell (14) respectively, and is used to separate hydrogen and oxygen from the alkali solution respectively; The alkaline electrolytic cell water supply and temperature control device further comprises: a water supply and temperature control system and an alkaline solution circulation system; The water replenishment and temperature control system is connected to the gas-liquid separation device and the alkali liquid circulation system, and is used to heat the deionized water until the temperature difference between the deionized water and the alkali liquid in the alkali liquid circulation system is less than the set temperature, and then input the deionized water into the gas-liquid separation device. After the deionized water passes through the hydrogen and oxygen separated by the gas-liquid separation device, it is input into the alkali liquid circulation system; The alkali liquid circulation system is connected to the gas-liquid separation device and the electrolytic cell (14), and is used to transport the alkali liquid and deionized water in the gas-liquid separation device to the electrolytic cell (14) after heat exchange with the alkali liquid heat exchanger.

2. The alkaline electrolytic cell water replenishment and temperature control device according to claim 1, characterized in that: The gas-liquid separation device comprises: a hydrogen separator (12) and an oxygen separator (13); The hydrogen separator (12) is connected to the hydrogen side outlet of the electrolytic cell (14) and is used to separate hydrogen from alkali solution. The gas outlet of the hydrogen separator (12) is connected to the hydrogen droplet catcher (10), and the liquid outlet is connected to the alkali solution circulation system. The oxygen separator (13) is connected to the oxygen side outlet of the electrolytic cell (14) for separating oxygen from alkali solution; the gas outlet of the oxygen separator (13) is connected to the oxygen droplet catcher (11), and the liquid outlet is connected to the alkali solution circulation system.

3. The alkaline electrolytic cell water replenishment and temperature control device according to claim 2, characterized in that: The alkaline electrolytic cell water replenishment and temperature control device further comprises: a hydrogen cooler (8) and an oxygen cooler (9); The hydrogen cooler (8) is connected to the hydrogen droplet catcher (10); and the oxygen cooler (9) is connected to the oxygen droplet catcher (11).

4. The alkaline electrolytic cell water replenishment and temperature control device according to any one of claims 1 to 3, characterized in that: The alkali solution circulation system comprises: an alkali solution circulation pump (15), an alkali solution heat exchanger (16) and a filter (17); The inlet of the alkali liquid circulation pump (15) is connected to the liquid outlet of the gas-liquid separation device, and the outlet of the alkali liquid circulation pump (15) is connected to the first inlet of the alkali liquid heat exchanger (16); the first outlet of the alkali liquid heat exchanger (16) is connected to the inlet of the filter (17), and the outlet of the filter (17) is connected to the alkali liquid inlet of the electrolytic cell (14); the second inlet of the alkali liquid heat exchanger (16) is connected to the first pipeline for introducing cooling water or heated deionized water; the second outlet of the alkali liquid heat exchanger (16) is connected to the second pipeline for discharging cooling water or returning deionized water to the deionized water tank (1) in the water replenishment temperature control system.

5. The alkaline electrolytic cell water replenishment and temperature control device according to claim 4, characterized in that: The first pipeline is provided with a fifth valve (19); the second pipeline is provided with a fourth valve (18).

6. The alkaline electrolytic cell water replenishment and temperature control device according to claim 4, characterized in that: The water replenishment and temperature control system comprises: a deionized water tank (1), a water replenishment pump (2), an electric heating device (3) and a temperature control system; The outlet of the deionized water tank (1) is connected to the inlet of the water supply pump (2), the outlet of the water supply pump (2) is connected to the inlet of the electric heating device (3), the outlet of the electric heating device (3) is connected to the inlets of the hydrogen droplet catcher (10) and the oxygen droplet catcher (11) through a fourth pipeline, and the outlets of the hydrogen droplet catcher (10) and the oxygen droplet catcher (11) are connected to the gas-liquid separation device; The temperature control system is connected to the electric heating device (3) and the alkali solution circulation system, and is used to control the electric heating device (3) to stop heating after the deionized water is heated to a temperature difference between the deionized water and the alkali solution in the alkali solution circulation system that is less than a set temperature.

7. The alkaline electrolytic cell water replenishment and temperature control device according to claim 6, characterized in that: The temperature control system comprises: a first temperature measuring device (4), a second temperature measuring device (21) and a temperature difference monitoring device (20); The first temperature measuring device (4) is connected to the electric heating device (3) and is used to detect the temperature of the deionized water in the electric heating device (3); the second temperature measuring device (21) is connected to the filter (17) and is used to detect the temperature of the alkali solution after being filtered by the filter (17); The temperature difference monitoring device (20) is simultaneously connected to the first temperature measuring device (4), the second temperature measuring device (21) and the control system, and is used to measure the temperature difference between the measurement values ​​of the first temperature measuring device (4) and the second temperature measuring device (21); the control system is connected to the electric heating device (3) and is used to control the switch of the electric heating device (3) according to the temperature difference.

8. The alkaline electrolytic cell water replenishment and temperature control device according to claim 6, characterized in that: The fourth pipeline is provided with a third valve (7).

9. The alkaline electrolytic cell water replenishment and temperature control device according to claim 6, characterized in that: The inlet of the deionized water tank (1) is connected to the second pipe via a third pipe; and the outlet of the electric heating device (3) is also connected to the first pipe via a fifth pipe.

10. The alkaline electrolytic cell water replenishment and temperature control device according to claim 9, characterized in that: The third pipeline is provided with a second valve (6); the fifth pipeline is provided with a first valve (5).

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