Multi-source heat coupled long-time heat standby system for hydrogen production by electrolysis and control method

Abstract

This invention discloses a multi-source thermally coupled electrolytic hydrogen production long-term thermal standby system and control method, belonging to the field of electrolytic hydrogen production technology. In this invention, the alkali solution in the alkali solution circulation loop of the electrolytic hydrogen production module exchanges heat with the circulating medium flowing through the first heat exchange unit and then returns to the electrolytic cell; the circulating medium flows back to the heat storage tank; a new energy auxiliary heating module and an electric-driven heat pump module are used to heat the circulating medium; an intelligent control module is connected to a first temperature sensor signal used to monitor the alkali solution temperature, and is used to control the operation of the circulating medium in the circulation pipeline according to the monitored temperature when the electrolytic cell is running; after the electrolytic cell is shut down, the new energy auxiliary heating module and / or the electric-driven heat pump module are controlled to start and stop according to the monitored temperature; before the electrolytic cell is started, the new energy auxiliary heating module and / or the electric-driven heat pump module are controlled to heat the circulating medium. This invention solves the problems of low energy efficiency and slow start-up in electrolytic hydrogen production systems, and comprehensively improves energy efficiency and start-up response speed.

Description

Technical Field

[0001] This invention relates to the field of electrolytic hydrogen production technology, specifically to a multi-source thermally coupled electrolytic hydrogen production long-term thermal backup system and control method. Background Technology

[0002] With the development of renewable energy, hydrogen production through electrolysis will gradually replace fossil fuel-based hydrogen production technologies, becoming one of the main sources of hydrogen energy. There are three main technical routes for hydrogen production through water electrolysis: alkaline electrolysis, proton exchange membrane electrolysis, and solid oxide electrolysis. Among them, alkaline water electrolysis (AWE) is the most mature and lowest-cost hydrogen production technology. This technology uses a 30% KOH or NaOH solution as the electrolyte, with the anode and cathode separated by a membrane and a direct current applied between them; at the anode, OH... - An oxidation reaction occurs to produce oxygen. At the cathode, H... + The oxygen is reduced to hydrogen. The generated hydrogen and oxygen flow out of the electrolytic cell with the circulating alkali solution, forming alkali and gas mixtures on the hydrogen side and oxygen side, respectively. These mixtures flow into the corresponding gas-liquid separators. After separation, the circulating alkali solution is pumped into the alkali cooler for further cooling, and then flows into the electrolytic cell. After absorbing the heat generated by electrolysis, the reaction temperature of the electrolytic cell is kept constant.

[0003] However, the electrolysis power of the AWE system is not constant, and the electrolysis efficiency is only 60%~75%. During operation, the electrolyzer generates a large amount of heat, requiring heat dissipation from the circulating alkaline solution to maintain a stable cell temperature. Furthermore, hydrogen production systems integrated with renewable energy sources such as photovoltaics and wind power are often subject to shutdowns due to the instability of these power sources. After a shutdown, the cell temperature drops, and a cold restart requires a considerable amount of time to reach full power output, severely impacting the response speed of the hydrogen production system and reducing its economic efficiency.

[0004] While existing technologies have proposed using phase change thermal energy storage to address issues such as long start-up times and reduced electrolysis efficiency during cold starts, simple phase change thermal energy storage systems have limited heat storage capacity and low heat quality. This makes it difficult to meet the high-quality heat source requirements for short-term start-ups and shutdowns, or the heating needs after long-term shutdowns. Therefore, there is an urgent need for new technologies to address the demands on both the total amount and quality of heat source for rapid restarting of electrolytic hydrogen production systems after short / long-term shutdowns. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems in the prior art and provide a multi-source thermally coupled electrolytic hydrogen production long-term thermal backup system and control method, which meets the requirements of the total amount and quality of heat source for rapid restart after short / long-term shutdown of the electrolytic hydrogen production system.

[0006] This invention provides a multi-source thermally coupled electrolytic hydrogen production long-term thermal backup system, including an electrolytic hydrogen production module, an electrically driven heat pump module, a thermal storage module, a new energy auxiliary heating module, and an intelligent control module; The electrolytic hydrogen production module includes an electrolytic cell and an alkali circulation loop connected thereto. A first temperature sensor for monitoring the alkali temperature is installed on the electrolytic cell or the alkali circulation loop. The heat storage module includes a heat storage tank, a first heat exchange unit, and a circulation pipeline. The heat storage tank stores a circulating medium. The alkali in the alkali circulation loop of the electrolytic hydrogen production module exchanges heat with the circulating medium flowing through the first heat exchange unit and then returns to the electrolytic cell. The circulating medium in the heat storage tank flows through the first heat exchange unit via the circulation pipeline and returns to the heat storage tank after exchanging heat with the alkali. Both the new energy auxiliary heating module and the electric drive heat pump module are connected to the heat storage tank pipeline for heating the circulating medium; The intelligent control module is connected to the first temperature sensor signal and is used to control the operation of the circulating medium in the circulation pipeline according to the data of the first temperature sensor when the electrolytic cell is running, so as to maintain the alkaline solution temperature within the target operating temperature range; after the electrolytic cell is shut down, it controls the start and stop of the new energy auxiliary heating module and / or the electric drive heat pump module according to the data of the first temperature sensor, so as to maintain the alkaline solution temperature within the set target heat preservation temperature range; before the electrolytic cell is started, it controls the new energy auxiliary heating module and / or the electric drive heat pump module to heat the circulating medium, so as to raise the alkaline solution temperature to the target start-up temperature through the heat storage module.

[0007] Preferably, the new energy auxiliary heating module includes a solar collector and a first circulation pump, and the inlet and outlet of the solar collector are connected to the circulation pipeline of the heat storage tank through a first valve group.

[0008] Preferably, the electrically driven heat pump module includes a second heat exchange unit, an expansion valve, an evaporator, and a compressor connected in sequence. The second heat exchange unit is connected in series to the circulating medium pipeline of the heat storage tank, and the output pipeline of the compressor is connected to the second heat exchange unit.

[0009] Preferably, the thermal storage module further includes a thermal storage circulation pump and a second valve group; the thermal storage circulation pump is installed on the outlet pipeline of the thermal storage tank; the output end of the first heat exchange unit is connected to the thermal storage tank via the thermal storage tank input pipeline, and the thermal storage tank input pipeline is also connected to an external heating interface, and the second valve group is installed on the external heating interface.

[0010] Preferably, during the operation of the electrolytic cell, the intelligent control module is configured to reduce the heat recovery from the alkali solution by decreasing the operating frequency of the thermal storage circulation pump if the alkali solution temperature is lower than the lower limit of the target operating temperature range; if the alkali solution temperature is higher than the upper limit of the target operating temperature range, the frequency of the thermal storage circulation pump is first increased; if the alkali solution temperature still cannot be reduced, the second valve group is opened to open the external heat dissipation branch.

[0011] Preferably, during the electrolytic cell shutdown phase, the intelligent control module is configured to, based on the data from the first temperature sensor, control the opening of the first valve group and start the first circulation pump when the alkali solution temperature is lower than a preset heat preservation threshold, so as to run the new energy auxiliary heating module; if the alkali solution temperature is still lower than the preset heat preservation threshold after a preset first time period, then control the start of the electric drive heat pump module.

[0012] Preferably, during the shutdown phase, the heat storage tank is also equipped with a second temperature sensor for monitoring the temperature of the circulating medium. The intelligent control module is also used to receive the monitoring data from the second temperature sensor. When the temperature of the circulating medium is lower than a maintenance threshold, the new energy auxiliary heating system is started to heat the circulating medium until the temperature of the circulating medium rises to the target heat storage temperature threshold and then stops.

[0013] The present invention also discloses a control method for the above-mentioned multi-source thermally coupled electrolytic hydrogen production long-term thermal standby system, including: Real-time monitoring of alkaline solution temperature; When the electrolyzer is in operation and the alkali solution temperature is higher than the set operating temperature threshold, the heat storage system is activated to recover waste heat. During the heat storage process, the alkali solution temperature is maintained within the preset target operating temperature range by adjusting the frequency of the heat storage circulation pump and / or the valve opening on the medium circulation pipeline. When the electrolyzer is shut down, if the alkali solution temperature is lower than the preset insulation threshold, the new energy auxiliary heating system and / or the electric-driven heat pump system are activated to heat the alkali solution circuit of the electrolyzer until the alkali solution temperature is not lower than the preset insulation lower limit. Before restarting the electrolyzer after shutdown, if the alkali solution temperature is lower than the startup temperature threshold, the new energy auxiliary heating system and / or the electric-driven heat pump system are controlled to heat the heat storage system until the alkali solution temperature reaches the preset startup temperature range.

[0014] Preferably, if the alkaline solution temperature cannot reach the starting temperature threshold by simply starting the new energy auxiliary heating system, the electric drive heat pump system is further started for auxiliary heating.

[0015] Preferably, the target operating temperature range is 90°C to 95°C, and the lower limit of the start-up temperature threshold and the heat preservation temperature range is 90°C.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention proposes a heat storage module that recovers waste heat and controls temperature by exchanging heat with the alkaline solution circuit. It couples new energy auxiliary heating with an electrically driven heat pump module to actively raise the temperature of the heat storage circulation medium for backup protection. An intelligent control module executes a phased control scheme, including operational temperature control, shutdown insulation, and startup preheating. This invention significantly expands the total heat source through multi-source coupling, fundamentally improves heat source quality through active heating, and achieves dynamic matching of heat source and demand through intelligent coordination. This systematically solves the dual demands of total heat source quantity and quality in electrolytic hydrogen production systems after short-term start-ups and long-term shutdowns. It successfully overcomes the problems of low energy efficiency and slow start-up caused by waste heat emissions and shutdown temperature loss, achieving a comprehensive improvement in system energy efficiency, economy, and start-up response speed. It also addresses the inherent defects of simple phase change heat storage systems, such as limited heat storage capacity and low thermal quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall system for long-term thermal standby of multi-source thermally coupled electrolytic hydrogen production according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the control logic in an embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Electrolyzer; 2. First valve; 3. Hydrogen-side gas-liquid separator; 4. Second valve; 5. Hydrogen-side alkali circulation pump; 6. First heat exchanger; 7. Third valve; 8. Oxygen-side gas-liquid separator; 9. Fourth valve; 10. Oxygen-side alkali circulation pump; 11. Second heat exchanger; 12. Hydrogen separator; 13. Make-up water circulation pump; 14. Alkali mixer; 15. Oxygen separator; 16. Circulating water mixer; 17. Fifth circulation pump; 18. Heat storage tank; 19. Seventh valve; 20. Solar heater; 21. Fifth valve; 22. Third heat exchanger; 23. Expansion valve; 24. Evaporator; 25. Compressor; 26. Sixth valve; 27. Fourth circulation pump; 28. Diverter; 29. ​​Eighth valve; 30. Intelligent control module; 31. Ninth valve. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” indicate that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described objects changes, the relative positional relationship may also change accordingly.

[0022] The multi-source thermally coupled electrolytic hydrogen production long-term thermal backup system of the present invention includes an electrolytic hydrogen production module, an electrically driven heat pump module, a thermal storage module, a new energy auxiliary heating module, and an intelligent control module; The electrolytic hydrogen production module includes an electrolytic cell and an alkali circulation loop connected thereto. A first temperature sensor for monitoring the alkali temperature is installed on the electrolytic cell or the alkali circulation loop. The heat storage module includes a heat storage tank, a first heat exchange unit, and a circulation pipeline. The heat storage tank stores a circulating medium. The alkali in the alkali circulation loop of the electrolytic hydrogen production module exchanges heat with the circulating medium flowing through the first heat exchange unit and then returns to the electrolytic cell. The circulating medium in the heat storage tank flows through the first heat exchange unit via the circulation pipeline and returns to the heat storage tank after exchanging heat with the alkali. Both the new energy auxiliary heating module and the electric drive heat pump module are connected to the heat storage tank pipeline for heating the circulating medium; The intelligent control module is connected to the first temperature sensor signal and is used to control the operation of the circulating medium in the circulation pipeline according to the data of the first temperature sensor when the electrolytic cell is running, so as to maintain the alkaline solution temperature within the target operating temperature range; after the electrolytic cell is shut down, it controls the start and stop of the new energy auxiliary heating module and / or the electric drive heat pump module according to the data of the first temperature sensor, so as to maintain the alkaline solution temperature within the set target heat preservation temperature range; before the electrolytic cell is started, it controls the new energy auxiliary heating module and / or the electric drive heat pump module to heat the circulating medium, so as to raise the alkaline solution temperature to the target start-up temperature through the heat storage module.

[0023] More specifically, please refer to Figure 1The electrolytic hydrogen production system of this embodiment includes an electrolyzer 1, a hydrogen-side gas-liquid separator 3, an oxygen-side gas-liquid separator 8, a hydrogen separator 12, an oxygen separator 15, a water circulation pump 13, an oxygen-side alkali circulation pump 10, a hydrogen-side alkali fifth circulation pump, and an alkali mixer 14. The water circulation pump 13 pumps water into the electrolytic alkali hydrogen production system to maintain a stable alkali flow rate. The alkali mixer 14 mixes alkali solutions of different concentrations from the hydrogen-side and oxygen-side circuits and returns them to the electrolyzer 1.

[0024] The thermal storage system includes a first heat exchange unit, a thermal storage tank 18, a circulating water mixer 16, a distributor 28, and a circulating pump 27. The first heat exchange unit includes a first heat exchanger 6 and a second heat exchanger 11; the first heat exchanger 6 is connected to the fifth circulating pump of the hydrogen-side alkaline solution, and the second heat exchanger 11 is connected to the oxygen-side alkaline solution circulating pump 10.

[0025] During the operation of the electrolytic hydrogen production system, the circulating medium in the heat storage tank 18 is divided into two streams by the distributor 28, flowing into the first heat exchanger 6 and the second heat exchanger 11 respectively. These streams exchange heat with the reflux alkaline solution from the electrolytic hydrogen production system, recovering and utilizing unused waste heat to heat the circulating medium and increase its temperature. The heated circulating medium is then transported back to the heat storage tank 18 for further heat exchange. After cooling, the circulating medium is pumped back into the distributor 28 by the circulation pump 27, thus achieving circulation.

[0026] Since the refluxed alkali solution is generally around 90°C, and the circulating medium uses the waste heat of the alkali solution to raise its own temperature after passing through the first heat exchanger 6 and the second heat exchanger 11, and then exchanges heat with the heat storage tank 18, the temperature of the heat storage medium in the heat storage tank is generally raised to above 70°C after the heat exchange.

[0027] After the electrolysis hydrogen production system is shut down, the thermal storage system is closed, and the new energy auxiliary heating system is started. The new energy auxiliary heating system includes a fifth circulation pump 17, a solar heater 20, and a seventh valve 19. The circulating medium is pumped to the solar heater 20 through the fifth circulation pump 17, heated to above 150°C, and then enters the thermal storage tank 18 for heat exchange. The circulation heating continues until the temperature of the thermal storage medium in the thermal storage tank rises to above 90°C, at which point the new energy auxiliary heating system is shut down; if the temperature is below 90°C, the new energy auxiliary heating system is restarted.

[0028] The electrically driven heat pump system includes a second heat exchange unit, an expansion valve 23, an evaporator 24, and a compressor 25 connected in sequence; such as Figure 1As shown, the second heat exchange unit in this embodiment is the third heat exchanger 22. Inside the evaporator 24, water absorbs heat energy from the low-temperature heat source environment and evaporates into water vapor. The compressor 25 compresses the water vapor to form high-pressure water vapor and releases heat energy into the high-temperature water vapor. Inside the third heat exchanger 22, the high-pressure water vapor cools and transforms into a liquid phase, while simultaneously outputting heat energy to the circulating medium of the heat storage system. The pressure of the water is reduced by the expansion valve 23, causing it to revert to a gaseous phase and return to the evaporator 24, completing the entire cycle and continuously absorbing heat energy from the low-temperature heat source and releasing it to the high-temperature heat source.

[0029] In this embodiment, the intelligent control module 30 uses an embedded intelligent control program to detect temperature signals in real time. Before the electrolysis hydrogen production system starts, it intelligently analyzes the current heat storage, the temperature of the heat storage circulating medium, and the preheating time, and adjusts the operating parameters of the heat storage system and the electric-driven heat pump system to ensure that the alkaline solution in the electrolyzer is heated to above 90°C before the electrolysis hydrogen production system starts, thus achieving rapid startup of the electrolysis hydrogen production system. The specific control method of the intelligent control module is as follows: if the circulating medium temperature is below 90°C, the new energy auxiliary heating module is activated first to raise the temperature; if the heating rate is insufficient or external conditions limit it, the electric-driven heat pump module is activated in conjunction to assist in heating; by adjusting the frequency of the heat storage circulating pump and related valves, the heat exchange intensity is controlled to ensure that the alkaline solution temperature is raised to above 90°C within a set time. This ensures that the alkaline solution in the electrolyzer is heated to above 90°C before the electrolysis hydrogen production system starts, thus achieving rapid startup of the electrolysis hydrogen production system.

[0030] In this embodiment, the temperature sensor has a temperature measurement accuracy of ±0.5℃. During the heat storage stage control: when the electrolytic cell is in operation and the alkaline solution temperature (T4) is >95℃, the embedded intelligent control program sends a command to the PLC controller to close the eighth valve 29, the fifth circulation pump 17, the seventh valve 19, the ninth valve 31, and the compressor 25; and opens the fifth valve 21 and the sixth valve 26 to store heat in the heat storage tank 18. During the heat storage process, the alkaline solution temperature (T4) of the electrolytic cell is monitored. If it is <90℃, the frequency of the fourth circulation pump 27 is reduced; if it is >95℃, the frequency of the fourth circulation pump 27 is increased; if it is still >95℃, the eighth valve 29 is gradually opened to utilize the residual heat of the alkaline solution for heating or other purposes, thereby maintaining the alkaline solution temperature (T4) between 90℃ and 95℃. During this period, the fifth circulation pump 17 and the seventh valve 19 can be opened as needed to activate the new energy auxiliary heating system and increase the temperature of the heat storage medium (T1) in the heat storage system to >95℃. Short-term shutdown and heat preservation stage control: When electrolytic cell 1 is shut down and the alkaline solution temperature (T4) of the electrolytic cell is <85℃, close valve 29, valve 21, valve 19, valve 26, and open circulation pump 17, valve 31, and circulation pump 27 to heat the alkaline solution of the electrolytic cell until the alkaline solution temperature (T4) of the electrolytic cell is maintained >90℃. If 90℃ cannot be reached, start compressor 25 to further increase the circulating liquid temperature through electric drive heat pump system until the alkaline solution temperature (T4) of the electrolytic cell is maintained >90℃. Long-term shutdown and restart control: When electrolytic cell 1 is shut down, if the temperature of the heat storage medium (T1) in the heat storage system is <90℃, close valves 29 (eighth), 21 (fifth), and 31 (ninth), open valve 19 (seventh) and circulation pump 17, start the new energy auxiliary heating system, raise the temperature of the heat storage medium (T1) in the heat storage system to >95℃, then stop, until the temperature of the heat storage medium (T1) in the heat storage system is <90℃ before restarting. Before restarting after a long-term shutdown, close valves 21 (fifth), 19 (seventh), and 26 (sixth), open circulation pump 17 (fifth), 31 (ninth), and circulation pump 27 to heat the alkaline solution in the electrolytic cell until the alkaline solution temperature (T4) is maintained >90℃. If 90℃ cannot be reached, start compressor 25 to further increase the circulating liquid temperature through the electrically driven heat pump system until the alkaline solution temperature (T4) in the electrolytic cell is maintained >90℃.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-source thermally coupled electrolytic hydrogen production long-term thermal backup system, characterized in that, It includes an electrolysis hydrogen production module, an electric drive heat pump module, a thermal storage module, a new energy auxiliary heating module, and an intelligent control module; The electrolytic hydrogen production module includes an electrolytic cell and an alkali circulation loop connected thereto. A first temperature sensor for monitoring the alkali temperature is installed on the electrolytic cell or the alkali circulation loop. The heat storage module includes a heat storage tank, a first heat exchange unit, and a circulation pipeline. The heat storage tank stores a circulating medium. The alkali in the alkali circulation loop of the electrolytic hydrogen production module exchanges heat with the circulating medium flowing through the first heat exchange unit and then returns to the electrolytic cell. The circulating medium in the heat storage tank flows through the first heat exchange unit via the circulation pipeline and returns to the heat storage tank after exchanging heat with the alkali. Both the new energy auxiliary heating module and the electric drive heat pump module are connected to the heat storage tank pipeline for heating the circulating medium; The intelligent control module is connected to the first temperature sensor signal and is used to control the operation of the circulating medium in the circulation pipeline according to the data of the first temperature sensor when the electrolytic cell is running, so as to maintain the alkaline solution temperature within the target operating temperature range; after the electrolytic cell is shut down, it controls the start and stop of the new energy auxiliary heating module and / or the electric drive heat pump module according to the data of the first temperature sensor, so as to maintain the alkaline solution temperature within the set target heat preservation temperature range; before the electrolytic cell is started, it controls the new energy auxiliary heating module and / or the electric drive heat pump module to heat the circulating medium, so as to raise the alkaline solution temperature to the target start-up temperature through the heat storage module.

2. The multi-source thermally coupled electrolytic hydrogen production long-term thermal standby system as described in claim 1, characterized in that, The new energy auxiliary heating module includes a solar collector and a first circulation pump. The inlet and outlet of the solar collector are connected to the circulation pipeline of the heat storage tank through a first valve group.

3. The multi-source thermally coupled electrolytic hydrogen production long-term thermal standby system as described in claim 1, characterized in that, The electrically driven heat pump module includes a second heat exchange unit, an expansion valve, an evaporator, and a compressor connected in sequence. The second heat exchange unit is connected in series to the circulating medium pipeline of the heat storage tank, and the output pipeline of the compressor is connected to the second heat exchange unit.

4. The multi-source thermally coupled electrolytic hydrogen production long-term thermal standby system as described in claim 1, characterized in that, The thermal storage module also includes a thermal storage circulation pump and a second valve group; the thermal storage circulation pump is installed on the outlet pipeline of the thermal storage tank; the output end of the first heat exchange unit is connected to the thermal storage tank via the thermal storage tank input pipeline, and the thermal storage tank input pipeline is also connected to an external heating interface, and the second valve group is installed on the external heating interface.

5. The multi-source thermally coupled electrolytic hydrogen production long-term thermal backup system as described in claim 4, characterized in that, During the operation of the electrolytic cell, the intelligent control module is configured to reduce the heat recovery from the alkali solution by decreasing the operating frequency of the thermal storage circulation pump if the alkali solution temperature is lower than the lower limit of the target operating temperature range; if the alkali solution temperature is higher than the upper limit of the target operating temperature range, the frequency of the thermal storage circulation pump is increased first; if the alkali solution temperature still cannot be reduced, the second valve group is opened to open the external heat dissipation branch.

6. The multi-source thermally coupled electrolytic hydrogen production long-term thermal standby system as described in claim 2, characterized in that, During the shutdown phase of the electrolytic cell, the intelligent control module is configured to, based on the data from the first temperature sensor, control the opening of the first valve group and start the first circulation pump when the alkaline solution temperature is lower than a preset heat preservation threshold, so as to run the new energy auxiliary heating module; if the alkaline solution temperature is still lower than the preset heat preservation threshold after a preset first time period, then control the start of the electric drive heat pump module.

7. The multi-source thermally coupled electrolytic hydrogen production long-term thermal standby system as described in claim 4, characterized in that, During the shutdown phase, the heat storage tank is also equipped with a second temperature sensor for monitoring the temperature of the circulating medium. The intelligent control module is also used to receive the monitoring data from the second temperature sensor. When the temperature of the circulating medium is lower than a maintenance threshold, the new energy auxiliary heating system is started to heat the circulating medium until the temperature of the circulating medium rises to the target heat storage temperature threshold and then stops.

8. The control method for a multi-source thermally coupled electrolytic hydrogen production long-term thermal standby system as described in any one of claims 1 to 7, characterized in that, include: Real-time monitoring of alkaline solution temperature; When the electrolyzer is in operation and the alkaline solution temperature is higher than the set operating temperature threshold, the heat storage system is activated to recover waste heat. During the thermal storage process, the alkaline solution temperature is maintained within the preset target operating temperature range by adjusting the frequency of the thermal storage circulation pump and / or the valve opening on the medium circulation pipeline. When the electrolytic cell is shut down, if the alkaline solution temperature is lower than the preset insulation threshold, the new energy auxiliary heating system and / or the electric-driven heat pump system are started to heat the alkaline solution circuit of the electrolytic cell until the alkaline solution temperature is not lower than the preset lower limit of the insulation temperature. Before restarting the electrolytic cell after shutdown, if the alkaline solution temperature is lower than the start-up temperature threshold, the new energy auxiliary heating system and / or the electric-driven heat pump system are controlled to heat the thermal storage system until the alkaline solution temperature reaches the preset start-up temperature range.

9. The control method as described in claim 8, characterized in that, If the alkaline solution temperature cannot reach the starting temperature threshold by simply starting the new energy auxiliary heating system, then the electric drive heat pump system will be further started for auxiliary heating.

10. The control method as described in claim 8, characterized in that, The target operating temperature range is 90°C to 95°C, and the lower limit of the start-up temperature threshold and the heat preservation temperature range is 90°C.

Images