Rapid energy-saving starting device for electrolytic cell

Abstract

The invention discloses a quick energy-saving starting device for an electrolytic bath, which comprises a water electrolysis hydrogen production subsystem and a circulating hot water station heat pump subsystem, the hydrogen production subsystem comprises an electrolytic bath, an oxygen gas-liquid separator, a hydrogen gas-liquid separator, an oxygen multi-channel alkali liquor heat exchanger, a hydrogen multi-channel alkali liquor heat exchanger, an oxygen alkali liquor circulating pump and a hydrogen alkali liquor circulating pump, and the heat pump subsystem comprises a circulating hot water station, a hydrogen compressor, an oxygen compressor, a hydrogen cooler and an oxygen cooler. The oxygen multi-channel alkali liquor heat exchanger and the hydrogen multi-channel alkali liquor heat exchanger are provided with circulating water channels, hot water channels and alkali liquor channels, cooling and heating functions are integrated, when the electrolytic bath operates, hot alkali liquor is cooled through circulating water, and when the electrolytic bath is in a standby state, the hot alkali liquor is cooled through hot water. The waste heat of the electrolytic bath system is used for maintaining the temperature of the cold alkali liquor so as to ensure quick start of the electrolytic bath. The power consumption in the starting process of the electrolytic cell is reduced, the operation cost is reduced, and the starting time of the electrolytic cell is shortened.

Description

Technical Field

[0001] The present invention belongs to the field of new energy, relates to technologies related to alkaline electrolytic water hydrogen production, and specifically, relates to a rapid energy-saving starting device for an electrolytic cell. Background Art

[0002] With the increasingly serious global warming and energy crisis, developing green and renewable clean energy is the common choice of countries around the world. Among many clean new energies, hydrogen energy has become the first choice for a new round of energy transformation due to its wide sources, zero emissions, good sustainability, and wide applications. In particular, green hydrogen, which is hydrogen energy prepared by electrolyzing water using renewable energies such as photovoltaic power generation and wind power, has obvious advantages in solving the carbon emission problem from the source, effectively accommodating the uneven distribution of renewable energies, and improving energy utilization efficiency, showing great development potential.

[0003] The technology of coupling renewable resources with alkaline electrolytic water hydrogen production is a commercially widely used large-scale electrolytic water hydrogen production technology, which has advantages such as simple process flow, low cost, good stability, and large capacity. However, there is still room for optimization in aspects such as energy utilization efficiency, stability of the hydrogen production process, and dynamic regulation of the hydrogen production process.

[0004] Limited by the capacity of a single electrolytic cell, the large-scale technology of coupling renewable resources with alkaline electrolytic water hydrogen production often adopts a technical scheme of connecting multiple electrolytic cells in parallel. However, the volatility and randomness of renewable energies (such as wind and light) themselves require frequent start-stop of alkaline electrolytic cells to meet rapid response. This requires making full use of the output of wind and light to produce hydrogen throughout the day. When the wind and light power generation load is high, a large amount of hydrogen is produced by the electrolytic cell. When the wind and light power generation load is low and the grid power supply cost is high, the operating load of the electrolytic cell is reduced. However, alkaline electrolytic cells have specific start-stop characteristics. Usually, during normal operation, the working temperature of the electrolytic cell is 70-90°C. When the power supply disappears and the alkaline electrolytic cell stops operating, the electrolyte will slowly dissipate heat. When the alkaline electrolytic cell reaches the normal working state from a completely stationary state, it takes 2-3 hours. Moreover, when the temperature is low, the resistance of the electrolyte is large, which will increase the energy consumption of electrolytic hydrogen production. When the alkali solution temperature is maintained at 70-80°C, the actual start-up time of the electrolytic cell can be shortened to several minutes, which is called the thermal start of the electrolytic cell. Therefore, maintaining the alkali solution temperature when the electrolytic cell operates at a low load or stops, shortening the restart time of the alkaline electrolytic cell, reducing the operating energy consumption, and saving costs in terms of time have important research value.

[0005] Patent CN114959740 discloses a thermal insulation system for a shutdown electrolyzer in large-scale alkaline water electrolysis for hydrogen production, which discloses a thermal insulation measure for rapid start-up and shutdown of an alkaline electrolyzer. The thermal insulation of the shutdown electrolyzer is achieved through the internal and external circulation heat exchange of hot alkali solution and cold shutdown alkali solution. However, the waste heat grade of the hot alkali solution in the operating electrolyzer is not high, resulting in poor thermal insulation effect for the shutdown electrolyzer. At the same time, the regulation and adaptability of this thermal insulation system are also poor, and the energy utilization efficiency is low.

[0006] Patent CN213013112U discloses a comprehensive thermal management system for a large-scale alkaline water electrolysis hydrogen production device, aiming to recover the waste heat generated during the water electrolysis process and improve the fluctuation adaptability of the electrolyzer. However, the recovered energy is lower than the temperature level of the waste heat, and the energy utilization efficiency is not high.

[0007] Patents CN215062987 and CN113137783 disclose a system for recovering the heat of water electrolysis for hydrogen production using a heat pump. However, the global regulation ability of this system is poor, and its adaptability to the variable load of the electrolyzer is also poor. Through retrieval, it is found that there are many studies on the comprehensive utilization of waste heat in the water electrolysis process, but generally the recovered waste heat grade is not high, the adaptability to the variable load of the entire electrolyzer system is poor, and some methods with the auxiliary heating function of an external heat source do not conform to the principle of energy conservation and consumption reduction.

[0008] Patent CN216141634 proposes an electrolyte temperature control system suitable for alkaline water electrolysis for hydrogen production. By connecting the pipelines at the inlets and outlets of the heat source control system and the cold source control system, the hydrogen production equipment can be heated when it is in standby, shortening the start-up time of the alkaline water electrolyzer. However, this patent will cause chloride ions in the circulating water to pollute the hot water or steam system. Summary of the Invention

[0009] To solve the deficiencies of the prior art, the present invention provides a rapid energy-saving start-up device for an electrolyzer. Considering the instability and volatility of renewable wind and solar power generation, the present invention meets the requirements of alkali solution cooling during the operation of the electrolyzer and heating and temperature maintenance before restarting after the electrolyzer has been shut down for a period of time, ensuring that the electrolyzer reaches the hot start temperature when starting, shortening the start-up time of the electrolyzer, optimizing the start-up and shutdown technical solutions of the electrolyzer, and improving the energy utilization efficiency.

[0010] The present invention provides a rapid energy-saving starting device for an electrolytic cell. The device includes an electrolytic water hydrogen production subsystem and a circulating hot water station heat pump subsystem. The electrolytic water hydrogen production subsystem includes an electrolytic cell, an oxygen gas-liquid separator, a hydrogen gas-liquid separator, an oxygen multi-channel alkaline solution heat exchanger, a hydrogen multi-channel alkaline solution heat exchanger, an oxygen alkaline solution circulation pump, and a hydrogen alkaline solution circulation pump. The inlets of the oxygen gas-liquid separator and the hydrogen gas-liquid separator are respectively connected to the anodic and cathodic outlets of the electrolytic cell. The inlet and outlet of the oxygen multi-channel alkaline solution heat exchanger are respectively connected to the outlet of the oxygen gas-liquid separator and the inlet of the oxygen alkaline solution circulation pump. The inlet and outlet of the hydrogen multi-channel alkaline solution heat exchanger are respectively connected to the outlet of the hydrogen gas-liquid separator and the inlet of the hydrogen alkaline solution circulation pump. The circulating hot water station heat pump subsystem includes a circulating hot water station, an oxygen compressor, a hydrogen compressor, an oxygen cooler, and a hydrogen cooler. The inlet and outlet of the oxygen multi-channel alkaline solution heat exchanger are respectively connected to the circulating hot water station and the oxygen cooler. The inlet and outlet of the hydrogen multi-channel alkaline solution heat exchanger are respectively connected to the circulating hot water station and the hydrogen cooler. The outlets of the oxygen cooler and the hydrogen cooler return water to the circulating hot water station, realizing the recycling of water in the device and saving water. The oxygen multi-channel alkaline solution heat exchanger and the hydrogen multi-channel alkaline solution heat exchanger are provided with a circulating water channel, a hot water channel, and an alkaline solution channel, integrating the functions of cooling and heating. When the electrolytic cell is operating, circulating water is used to cool the hot alkaline solution. When the electrolytic cell is in a standby state, the waste heat of the electrolytic cell system is used to maintain the temperature of the cold alkaline solution to ensure the rapid start of the electrolytic cell.

[0011] The inlet of the oxygen compressor is connected to the outlet of the oxygen gas-liquid separator, and the outlet of the oxygen compressor is connected to the inlet of the oxygen cooler. The inlet of the hydrogen compressor is connected to the outlet of the hydrogen gas-liquid separator, and the outlet of the hydrogen compressor is connected to the inlet of the hydrogen cooler.

[0012] When the electrolytic cell is operating normally, the flow rate of the circulating water is adjusted by setting a thermometer at the alkaline solution outlet to control the temperature of the circulating alkaline solution at the outlets of the oxygen and hydrogen multi-channel alkaline solution heat exchangers. When the electrolytic cell has been out of use for a period of time and is about to be restarted, the alkaline solution is heated to the hot start temperature of the electrolytic cell by hot water and the temperature is maintained 1-2 hours before starting. The temperature of the alkaline solution controls the hot water flow rate through the temperature of the circulating alkaline solution at the outlets of the oxygen and hydrogen multi-channel alkaline solution heat exchangers.

[0013] The hot water of the circulating hot water station consists of two parts. One part is heated by the hot water return of the circulating hot water station, and the other part is heated in two stages by the circulating cooling water, that is, the ordinary circulating cooling water used to cool the hot alkaline solution is sent to the hydrogen cooler and the oxygen cooler through pipelines after being heated in the oxygen multi-channel alkaline solution heat exchanger and the hydrogen multi-channel alkaline solution heat exchanger, and then sent to the circulating hot water station after being heated again.

[0014] In the rapid energy-saving starting device for the electrolytic cell, the hydrogen gas-liquid separator and the oxygen gas-liquid separator are shared by 2-16 electrolytic cells.

[0015] Temperature display and control are provided at the lye outlets of the oxygen multi-channel lye heat exchanger and the hydrogen multi-channel lye heat exchanger for detecting and controlling the lye temperature.

[0016] The basic principle of a rapid energy-saving start-up device for an electrolytic cell in the present invention is as follows: During the wind and solar hydrogen production stage, due to the high-load operation of the electrolytic cell, the return water of the circulating hot water obtained by cooling the electrolytic solution is recovered to the circulating hot water station for storage and standby; when the wind and solar power generation shows fluctuations and it is necessary to reduce the load of the electrolytic cell or stop its operation, the hot water return water originally stored in the circulating hot water station is sent to the electrolytic cell with low load operation or shutdown through the multi-channel lye heat exchanger provided in the device to heat and maintain the temperature of the electrolytic solution in the electrolytic cell, so as to shorten the start-up time and respond in a timely manner when it is necessary to increase the operation load of the electrolytic cell or start the electrolytic cell.

[0017] The present invention has the following beneficial effects:

[0018] 1) The circulating hot water station of the hydrogen production device in the present invention has stronger regulation for the entire electrolytic cell system, can maintain the stability of the lye temperature in the electrolytic cell under various working conditions, realizes the rapid response to the variable load of the electrolytic cell caused by the volatility, randomness and intermittency of renewable resources, and ensures the stability of the operation of the electrolytic water hydrogen production device.

[0019] 2) The multi-channel lye heat exchanger in the present invention integrates the functions of cooling and heating, generally reduces the equipment investment, reduces the hydrogen production cost, and simplifies the electrolytic water hydrogen production process; the circulating water pipeline and the hot water pipeline of the multi-channel lye heat exchanger are completely separated, which can realize the functions of cooling and heating the lye while avoiding the pollution of the hot water system by the circulating water and is easier to control in operation.

[0020] 3) The present invention improves the quality of the waste heat of the electrolytic water hydrogen production process, thereby maintaining the lye temperature of the shutdown electrolytic cell at a level that can be quickly started, improving the energy utilization efficiency, and the heat preservation of the lye effectively avoids the safety hazard of the electrolytic cell leakage caused by excessive temperature difference during the start-up and shutdown of the electrolytic cell.

[0021] 4) The present invention reduces the power consumption during the start-up process of the electrolytic cell to a certain extent, reduces the operation cost, and improves the start-up time of the alkaline electrolytic cell. Brief Description of the Drawings

[0022] Figure 1 It is a schematic process flow diagram of the present invention.

[0023] In the figure: 1 - electrolytic cell, 2 - oxygen gas-liquid separator, 3 - hydrogen gas-liquid separator, 4 - oxygen multi-channel lye heat exchanger, 5 - hydrogen multi-channel lye heat exchanger, 6 - oxygen compressor, 7 - hydrogen compressor, 8 - oxygen cooler, 9 - hydrogen cooler, 10 - circulating hot water station, 11 - oxygen lye circulation pump, 12 - hydrogen lye circulation pump Detailed implementation manners

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] As Figure 1 shown, the present invention provides a rapid energy-saving start-up device for an electrolytic cell. The device includes an electrolytic water hydrogen production subsystem and a circulating hot water station heat pump subsystem. The electrolytic water hydrogen production subsystem includes an electrolytic cell 1, an oxygen gas-liquid separator 2, a hydrogen gas-liquid separator 3, an oxygen multi-channel lye heat exchanger 4, a hydrogen multi-channel lye heat exchanger 5, an oxygen lye circulation pump 11 and a hydrogen lye circulation pump 12. The inlets of the oxygen gas-liquid separator 2 and the hydrogen gas-liquid separator 3 are respectively connected to the anode and cathode outlets of the electrolytic cell 1; the inlet and outlet of the oxygen multi-channel lye heat exchanger 4 are respectively connected to the outlet of the oxygen gas-liquid separator 4 and the inlet of the oxygen lye circulation pump 11, and the inlet and outlet of the hydrogen multi-channel lye heat exchanger 5 are respectively connected to the outlet of the hydrogen gas-liquid separator 3 and the inlet of the hydrogen lye circulation pump 12; the circulating hot water station heat pump subsystem includes a circulating hot water station 10, an oxygen compressor 6, a hydrogen compressor 7, an oxygen cooler 8 and a hydrogen cooler 9. The inlet and outlet of the oxygen multi-channel lye heat exchanger 4 are respectively connected to the circulating hot water station and the oxygen cooler, and the inlet and outlet of the hydrogen multi-channel lye heat exchanger 5 are respectively connected to the circulating hot water station and the hydrogen cooler. The outlets of the oxygen cooler 8 and the hydrogen cooler 9 return water to the circulating hot water station 10, realizing the recycling of water in the device and saving water; the oxygen multi-channel lye heat exchanger 4 and the hydrogen multi-channel lye heat exchanger 5 are provided with a circulating water channel, a hot water channel and a lye channel, integrating the functions of cooling and heating. When the electrolytic cell is operating, circulating water is used to cool the hot lye, and when the electrolytic cell 1 is in a standby state, the waste heat of the electrolytic cell 1 system is used to maintain the temperature of the cold lye to ensure the rapid start-up of the electrolytic cell 1.

[0026] The inlet of the oxygen compressor 6 is connected to the outlet of the oxygen gas-liquid separator 2, and the outlet of the oxygen compressor 6 is connected to the inlet of the oxygen cooler 8. The inlet of the hydrogen compressor 7 is connected to the outlet of the hydrogen gas-liquid separator 3, and the outlet of the hydrogen compressor 7 is connected to the inlet of the hydrogen cooler 9.

[0027] When the electrolyzer 1 operates normally, the flow rate of the circulating water is adjusted by setting a thermometer at the lye outlet to control the temperature of the circulating lye at the outlet of the oxygen and hydrogen multi-channel lye heat exchanger; when the electrolyzer 1 has been out of use for a period of time and is about to be restarted, the lye is heated to the hot start temperature of the electrolyzer with hot water 1-2 hours before the restart and the temperature is maintained. The temperature of the hot water is controlled by the temperature of the circulating lye at the outlet of the oxygen and hydrogen multi-channel lye heat exchanger to control the flow rate of the hot water.

[0028] The hot water of the circulating hot water station 10 consists of two parts. One part is heated by the hot water return of the circulating hot water station, and the other part is heated in two stages by the circulating cooling water, that is, the ordinary circulating cooling water used to cool the hot lye is heated in the oxygen multi-channel lye heat exchanger and the hydrogen multi-channel lye heat exchanger and then sent to the hydrogen cooler and the oxygen cooler by pipelines, and after being heated again, it is sent to the circulating hot water station.

[0029] In the electrolyzer rapid energy-saving startup device, the hydrogen gas-liquid separator 3 and the oxygen gas-liquid separator 2 are shared by 2-16 electrolyzers.

[0030] Temperature display and control are provided at the lye outlets of the oxygen multi-channel lye heat exchanger 4 and the hydrogen multi-channel lye heat exchanger 5 to detect and control the lye temperature.

[0031] The electrolyzer rapid energy-saving startup device is at least configured with a set of the above-mentioned circulating hot water station heat pump subsystems. Each set of circulating hot water stations is equipped with a hydrogen compressor, an oxygen compressor, a hydrogen cooler and an oxygen cooler and is shared by multiple electrolyzers. Temperature display and control are provided at the lye outlets of the multi-channel lye heat exchangers to detect and control the lye temperature.

[0032] The basic principle of an electrolyzer rapid energy-saving startup device of the present invention is as follows: during the wind and solar hydrogen production stage, due to the high-load operation of the electrolyzer, the circulating hot water return obtained by cooling the electrolyte is recovered to the circulating hot water station for standby; when the wind and solar power generation fluctuates and it is necessary to reduce the load of the electrolyzer or stop its operation, the hot water return originally stored in the circulating hot water station is sent to the electrolyzer with low load operation or shutdown through the multi-channel lye heat exchanger provided in the device to heat and maintain the temperature of the electrolyte in the electrolyzer, so as to shorten the startup time and respond in time when it is necessary to increase the operation load of the electrolyzer or start the electrolyzer.

[0033] Example 1

[0034] The oxygen gas-liquid separator 2 and the hydrogen gas-liquid separator 3 adopt a two-in-one combination, that is, one oxygen gas-liquid separator 2 and one hydrogen gas-liquid separator 3 are shared by two electrolyzers 1. The oxygen compressor 6, the hydrogen compressor 7, the oxygen cooler 8 and the hydrogen cooler 9 adopt a two-in-one combination, that is, two electrolyzers 1 share one oxygen compressor 6, one oxygen cooler 8, one hydrogen compressor 7 and one hydrogen cooler 9. When the electrolyzer 1 is operating, the caustic liquor at about 75 °C at the bottom of the oxygen gas-liquid separator 2 and the hydrogen gas-liquid separator 3 respectively enters the oxygen multi-channel caustic liquor heat exchanger 4 and the hydrogen multi-channel caustic liquor heat exchanger 5 and is cooled to room temperature, and the circulating cooling water is heated to about 40 °C. The oxygen and hydrogen at the outlets of the oxygen gas-liquid separator 2 and the hydrogen gas-liquid separator 3 respectively enter the oxygen compressor 6 and the hydrogen compressor 7. The temperature of the gas at the outlet of the compressor is about 130 °C. The compressed gases respectively enter the oxygen cooler 8 and the hydrogen cooler 9 to heat the hot water return water at about 70 °C or the heated circulating cooling water and send it to the circulating hot water station 10 for standby. The temperature of the heated hot water is about 110 °C. When one of the two electrolyzers 1 is shut down, open the hot water pipeline of the multi-channel electrolyzer of the shut-down electrolyzer 1 and close the cooling water pipeline. The high-grade hot water from the circulating hot water station 10 maintains the temperature of the cold caustic liquor, so that the caustic liquor temperature of the electrolyzer 1 in the standby state is maintained at about 70 °C.

[0035] Example 2

[0036] The oxygen gas-liquid separator 2 and the hydrogen gas-liquid separator 3 adopt a sixteen-in-one combination, that is, one oxygen gas-liquid separator 2 and one hydrogen gas-liquid separator 3 are shared by sixteen electrolyzers 1. The oxygen compressor 6, the hydrogen compressor 7, the oxygen cooler 8 and the hydrogen cooler 9 adopt a sixteen-in-one combination, that is, sixteen electrolyzers 1 share one oxygen compressor 6, one oxygen cooler 8, one hydrogen compressor 7 and one hydrogen cooler 9. When the electrolyzer 1 is operating, the caustic liquor at about 80 °C at the bottom of the oxygen gas-liquid separator 2 and the hydrogen gas-liquid separator 3 respectively enters the oxygen multi-channel caustic liquor heat exchanger 4 and the hydrogen multi-channel caustic liquor heat exchanger 5 and is cooled to room temperature, and the circulating cooling water is heated to about 42 °C. The oxygen and hydrogen at the outlets of the oxygen gas-liquid separator 2 and the hydrogen gas-liquid separator 3 respectively enter the oxygen compressor 6 and the hydrogen compressor 7. The temperature of the gas at the outlet of the compressor is about 132 °C. The compressed gases respectively enter the oxygen cooler 8 and the hydrogen cooler 9 to heat the hot water return water at about 70 °C or the heated circulating cooling water and send it to the circulating hot water station 10 for standby. The temperature of the heated hot water is about 112 °C. When one or more of the sixteen electrolyzers 1 are shut down, open the hot water pipeline of the multi-channel electrolyzer of the shut-down electrolyzer 1 and close the cooling water pipeline. The high-grade hot water from the circulating hot water station 10 maintains the temperature of the cold caustic liquor, so that the caustic liquor temperature of the electrolyzer in the standby state is maintained at about 72 °C.

[0037] The above are only typical examples of the present invention, and no formal restrictions are imposed on the present invention. Any person skilled in the relevant art, without departing from the technical solution of the present invention, any changes or modifications made using the above technical content should be regarded as equivalent examples of equivalent changes. Any equivalent changes made to the above examples based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A rapid energy-saving start-up device for an electrolytic cell, characterized in that: The device comprises a water electrolysis hydrogen production subsystem and a circulating hot water station heat pump subsystem, wherein the water electrolysis hydrogen production subsystem comprises an electrolyzer, an oxygen gas-liquid separator, a hydrogen gas-liquid separator, an oxygen multi-channel alkali liquid heat exchanger, a hydrogen multi-channel alkali liquid heat exchanger, an oxygen alkali liquid circulation pump and a hydrogen alkali liquid circulation pump, wherein the inlets of the oxygen gas-liquid separator and the hydrogen gas-liquid separator are respectively connected to the anode and cathode outlets of the electrolyzer; the inlet and outlet of the oxygen multi-channel alkali liquid heat exchanger are respectively connected to the outlet of the oxygen gas-liquid separator and the inlet of the oxygen alkali liquid circulation pump, and the inlet and outlet of the hydrogen multi-channel alkali liquid heat exchanger are respectively connected to the outlet of the hydrogen gas-liquid separator and the inlet of the hydrogen alkali liquid circulation pump; the circulating hot water station heat pump subsystem comprises a circulating heat Water station, oxygen compressor, hydrogen compressor, oxygen cooler, hydrogen cooler, the inlet and outlet of the oxygen multi-channel alkali liquid heat exchanger are respectively connected to the circulating hot water station and the oxygen cooler, the inlet and outlet of the hydrogen multi-channel alkali liquid heat exchanger are respectively connected to the circulating hot water station and the hydrogen cooler, and the outlets of the oxygen cooler and the hydrogen cooler return water to the circulating hot water station; the oxygen multi-channel alkali liquid heat exchanger and the hydrogen multi-channel alkali liquid heat exchanger are provided with circulating water channels, hot water channels and alkali liquid channels, integrating cooling and heating functions. When the electrolyzer is running, circulating water is used to cool the hot alkali liquid. When the electrolyzer is in standby state, the waste heat of the electrolyzer system is used to maintain the temperature of the cold alkali liquid to ensure the rapid start-up of the electrolyzer.

2. The inlet of the oxygen compressor is connected to the outlet of the oxygen gas-liquid separator, and the outlet of the oxygen compressor is connected to the inlet of the oxygen cooler. The inlet of the hydrogen compressor is connected to the outlet of the hydrogen gas-liquid separator, and the outlet of the hydrogen compressor is connected to the inlet of the hydrogen cooler.

3. The electrolytic cell rapid energy-saving startup device according to claim 1, characterized in that: When the electrolytic cell is operating normally, a thermometer is provided at the alkali liquid outlet to adjust the flow of circulating water and control the temperature of the circulating alkali liquid outlet of the oxygen and hydrogen multi-channel alkali liquid heat exchanger; when the electrolytic cell is stopped for a period of time, the alkali liquid is heated to the hot start temperature of the electrolytic cell and maintained at the temperature 1 to 2 hours before restarting, and the alkali liquid temperature controls the hot water flow by the temperature of the circulating alkali liquid outlet of the oxygen and hydrogen multi-channel alkali liquid heat exchanger.

4. The hot water of the circulating hot water station consists of two parts, one part is heated by the hot water return water of the circulating hot water station, and the other part is heated by the circulating cooling water in two stages, that is, the ordinary circulating cooling water used to cool the hot alkali liquid is heated in the oxygen multi-channel alkali liquid heat exchanger and the hydrogen multi-channel alkali liquid heat exchanger, and then sent to the hydrogen cooler and the oxygen cooler through the pipeline, and then sent to the circulating hot water station after being heated again.

5. The electrolytic cell rapid energy-saving startup device according to claim 1, characterized in that: The hydrogen gas-liquid separator and the oxygen gas-liquid separator in the electrolytic cell rapid energy-saving startup device are shared by 2 to 16 electrolytic cells.

6. The electrolytic cell rapid energy-saving startup device according to claim 1, characterized in that: The alkali liquid outlets of the oxygen multi-channel alkali liquid heat exchanger and the hydrogen multi-channel alkali liquid heat exchanger are both provided with temperature display and control for detecting and controlling the alkali liquid temperature.

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