A quick thermal starting device and method of an electrolytic water system based on single-tank heat storage technology

Abstract

The application discloses a kind of based on single tank heat storage technology's electrolytic water system quick heat starting device, including electrolytic cell, buffer tank, sloping temperature layer heat storage tank and heat exchanger;The waterway outlet of electrolytic cell is connected with buffer tank, and the lower portion of buffer tank and the one port of first three-way flow valve are connected;The lower portion of sloping temperature layer heat storage tank is also connected with the one port of third three-way flow valve, and the upper portion is connected with the two ports of first three-way flow valve and the one port of second three-way flow valve, and the three ports of first three-way flow valve are connected with the electrolytic water medium inlet of heat exchanger, and the electrolytic water medium outlet of heat exchanger is connected with the waterway inlet of electrolytic cell, and the two ports of second three-way flow valve are connected with the cooling medium outlet of heat exchanger, and the two ports of third three-way flow valve are connected with the cooling medium inlet of heat exchanger.The application sets up heat storage tank, is combined heat exchanger, passes through two sets of electrolyte alternate operation, effectively utilizes the waste heat and the cold of electrolyte of system itself and realizes electrolytic water hydrogen production system quick heat starting.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen production by water electrolysis, and specifically relates to a rapid hot start device and method for an electrolysis system based on single-tank thermal storage technology. Background Technology

[0002] The electrolysis of water to produce hydrogen still faces core challenges in its industrialization process, such as thermodynamic control and energy adaptability, which urgently require systematic research breakthroughs.

[0003] As an innovative model for renewable energy consumption, wind-solar coupled hydrogen production systems face a significant technological bottleneck: the contradiction between the strong fluctuations in energy input and the thermal inertia of the hydrogen production process. Statistics show that the output fluctuations of wind and solar power can reach over 80% of the rated power, resulting in more than 300 start-ups and shutdowns of the electrolyzer annually. Frequent thermal cycling not only accelerates the passivation of the electrolyzer electrode materials due to accumulated thermal stress but also exposes the system to an energy consumption trap of "cold start-up-preheating-steady-state operation." Experimental data indicates that the electrolyzer requires 15% of its rated power for preheating from room temperature to its operating temperature of 80°C, and for every 10°C drop in temperature after shutdown, the restart energy consumption increases by 8%.

[0004] Therefore, modern engineering practice commonly employs a hot standby strategy, using external hot circulating fluid for forced heat exchange or phase change materials for heat storage, enabling the water electrolysis system to reach operating temperature within 20 minutes. However, forced heat exchange with external hot circulating fluid faces problems such as large pipeline heat loss and low insulation efficiency (≤85%); phase change materials are accompanied by the risk of molten salt corrosion of the shell, increasing maintenance costs, and both have system complexity issues. In summary, the hot standby strategies commonly used in modern engineering practice all sacrifice lifespan or energy efficiency for speed. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide a rapid hot start device and method for an electrolytic water system based on single-tank thermal storage technology, which can recover part of the waste heat in the electrolysis process by using cooling electrolyte while ensuring rapid hot start.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A rapid hot start device for an electrolytic water system based on single-tank thermal storage technology includes an electrolytic cell, a buffer tank, a thermocline thermal storage tank, and a heat exchanger.

[0008] The water outlet of the electrolytic cell is connected to the buffer tank, the buffer tank is connected to the lower part of the inclined thermosphere thermal storage tank, and a second circulation pump is installed on the connecting pipeline; the buffer tank is also connected to one port of the first three-way flow valve; the lower part of the inclined thermosphere thermal storage tank is also connected to one port of the third three-way flow valve.

[0009] The upper part of the inclined temperature layer heat storage tank is connected to the two ports of the first three-way flow valve, the three ports of the first three-way flow valve are connected to the electrolytic water medium inlet of the heat exchanger, and a first circulation pump is installed on the connecting pipeline. The electrolytic water medium outlet of the heat exchanger is connected to the water inlet of the electrolytic cell.

[0010] The upper part of the inclined temperature layer heat storage tank is also connected to one port of the second three-way flow valve, and a third circulation pump is installed on the connecting pipeline. The two ports of the second three-way flow valve are connected to the cooling medium outlet of the heat exchanger, and the two ports of the third three-way flow valve are connected to the cooling medium inlet of the heat exchanger.

[0011] In one embodiment, the three ports of the second three-way flow valve are connected to the cooling water outlet, and the three ports of the third three-way flow valve are connected to the cooling water inlet.

[0012] In one embodiment, the volume of the inclined thermosphere thermal storage tank is 1.5 to 2 times the electrolyte capacity required for normal operation of the water electrolysis system.

[0013] In one embodiment, a first temperature sensor is provided on the outlet pipe of the first circulating pump, and a second temperature sensor is provided in the lower middle part of the inclined thermosphere thermal storage tank. The first and second temperature sensors are used to collect temperature information to realize the joint control of the second three-way flow valve and the third three-way flow valve.

[0014] In one embodiment, a volumetric flow meter is installed at two ports of the first three-way flow valve, and a solenoid valve is installed on the connecting pipeline between the buffer tank and the inclined thermosphere thermal storage tank. The volumetric flow meter is used to collect flow information to realize the joint control of the first three-way flow valve and the solenoid valve.

[0015] This invention also provides a rapid hot-start method for an electrolyzed water system based on single-tank thermal storage technology, implemented using the aforementioned rapid hot-start device for an electrolyzed water system based on single-tank thermal storage technology. The method is characterized by storing hot electrolyte in a thermocline thermal storage tank. When the original electrolyte in the buffer tank, electrolytic cell, and the entire electrolyzed water system has cooled down, and the electrolyzed water system needs to be started:

[0016] Open the pipeline connecting the first three-way flow valve to the upper part of the inclined temperature layer and the first circulation pump, and close the pipeline connecting it to the buffer tank;

[0017] Turn on the first circulation pump to extract the hot electrolyte from the upper part of the inclined thermosphere storage tank and inject it into the electrolysis water system. Turn on the second circulation pump to extract the cooled electrolyte from the electrolysis water system through the buffer tank and inject it into the lower part of the inclined thermosphere storage tank.

[0018] When the volume of electrolyte injected into the water electrolysis system reaches the electrolyte capacity required for normal system operation, the second circulation pump is turned off, the pipeline connecting the first three-way flow valve to the upper part of the inclined temperature layer heat storage tank is closed, and the pipeline connected to the buffer tank is opened to complete the replacement of the electrolyte in the system from cold to hot, thus achieving rapid hot start-up.

[0019] In one embodiment, after the system is running normally, when the electrolyte temperature rises to the point of affecting the system operation, the pipelines connecting the second three-way flow valve and the third three-way flow valve to the heat exchanger are opened.

[0020] When the temperature of the electrolyte in the inclined temperature layer heat storage tank is lower than the set value, the pipeline connecting the second three-way flow valve and the third circulation pump, as well as the pipeline connecting the third three-way flow valve and the inclined temperature layer heat storage tank, are opened. The electrolyte cooled in the inclined temperature layer heat storage tank is used as the cooling medium of the heat exchanger to realize the heating of the electrolyte in the inclined temperature layer heat storage tank and the recovery of waste heat from the electrolysis water system.

[0021] When the electrolyte temperature in the inclined thermosphere storage tank reaches the set value, close the pipeline connecting the second three-way flow valve and the third circulation pump, open the pipeline connected to the cooling water outlet, close the pipeline connecting the third three-way flow valve to the lower part of the inclined thermosphere storage tank, open the pipeline connected to the cooling water inlet, and use cooling water as the cooling medium for the heat exchanger.

[0022] Compared with existing rapid hot start solutions for water electrolysis hydrogen production systems, this invention does not require external heat source assistance. It only adds a heat storage tank to the original system, uses two sets of electrolytes alternately, and heats the standby electrolyte in the heat storage tank by recovering the waste heat generated during the operation of the electrolyzer. This utilizes both the waste heat of the system and the cooling capacity of the electrolyte, reducing the consumption of cooling water.

[0023] Compared to existing phase change material heat storage, using the electrolyte itself for heat storage reduces the number of heat recovery and utilization steps, and the equipment investment cost is low, without increasing the overall power consumption of the original system. This solution is effective for alkaline water hydrogen production systems, proton exchange membrane (PEM) water electrolysis hydrogen production systems, anion exchange membrane water electrolysis hydrogen production systems, and related water electrolysis test bench systems. It can reduce equipment costs, reduce system energy consumption, and has the advantages of rapid hot start-up and high economic efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1This is a diagram of the device of the present invention.

[0026] Figure 2 This is a schematic diagram of the thermal storage tank principle.

[0027] In the diagram: 1. Electrolytic cell; 2. Buffer tank; 3. Heat exchanger; 4. First circulating pump; 5. First three-way flow valve; 6. Second circulating pump; 7. Second three-way flow valve; 8. Third three-way flow valve; 9. Inclined thermocline storage tank; 10. Solenoid valve; 11. Cooling water outlet; 12. Cooling water inlet; 13. First temperature sensor; 14. Second temperature sensor; 15. Third circulating pump; 16. Volumetric flow meter. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] 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 embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0032] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0033] In existing technologies, achieving rapid hot start often affects equipment lifespan or system energy efficiency. Therefore, this invention provides a rapid hot start device for an electrolytic water system based on single-tank thermal storage technology. Employing this technology, two sets of electrolytes are used alternately, reducing heat exchange steps during hot standby and requiring only one additional thermal storage tank in the system. This results in advantages such as system simplicity, high thermal storage efficiency, low cost, and convenient maintenance.

[0034] like Figure 1 As shown, the device of the present invention mainly includes an electrolytic cell 1, a buffer tank 2, a thermocline heat storage tank 9, and a heat exchanger 3, as well as several valves, pumps, and sensors.

[0035] The single-tank principle of the inclined thermosphere thermal storage tank 9 of this invention is as follows: Figure 2 As shown, it utilizes the density difference of fluids at different temperatures to achieve natural stratification: the high-temperature medium (low density) is located at the top of the tank, the low-temperature medium (high density) is located at the bottom, and a temperature gradient transition zone (climatic layer) is formed in between. During heating, the high-temperature medium is injected from the top of the tank, pushing the low-temperature medium out from the bottom. Figure 2 The principle of the thermal storage tank and the temperature distribution trend of the liquid inside the tank are shown. In this invention, to achieve good circulation, the volume of the inclined thermocline thermal storage tank 9 is recommended to be 1.5 to 2 times the electrolyte capacity required for normal operation of the water electrolysis system.

[0036] The water outlet of electrolytic cell 1 is connected to buffer tank 2 via a pipeline. Buffer tank 2 is directly connected to the lower part of inclined thermosphere heat storage tank 9 via a pipeline. A second circulation pump 6 is installed on the connecting pipeline, and a solenoid valve 10 can be installed thereon. The water inlet of electrolytic cell 1 is connected to the electrolyzed water medium outlet of heat exchanger 3.

[0037] The valves of this invention mainly include a first three-way flow valve 5, a second three-way flow valve 7, and a third three-way flow valve 8. The first three-way flow valve 5 has one port connected to the buffer tank 2, two ports connected to the upper part of the inclined thermosphere heat storage tank 9, and three ports connected to the electrolytic water medium inlet of the heat exchanger 3. A first circulating pump 4 can be installed on the connecting pipeline.

[0038] One port of the second three-way flow valve 7 is connected to the upper part of the inclined temperature layer heat storage tank 9, and a third circulation pump 15 is installed on the connecting pipeline. That is, one port of the second three-way flow valve 7 is connected to the second port of the first three-way flow valve 5. The second port of the second three-way flow valve 7 is connected to the cooling medium outlet of the heat exchanger 3, and the third port is connected to the cooling water outlet 11 of the device.

[0039] One port of the third three-way flow valve 8 is connected to the lower part of the inclined temperature layer heat storage tank 9, the second port is connected to the cooling medium inlet of the heat exchanger 3, and the third port is connected to the cooling water inlet 12 of the device.

[0040] Clearly, the connections mentioned above all refer to pipe connections.

[0041] Sensors are the devices used in this invention to achieve automatic control, and their main monitoring objects include temperature and volume. Specifically, a first temperature sensor 13 is installed on the outlet pipe of the first circulating pump 4, and a second temperature sensor 14 is installed in the lower middle part of the inclined thermostatic storage tank 9. The first temperature sensor 13 and the second temperature sensor 14 are used to collect temperature information at their respective locations to achieve joint control of the second three-way flow valve 7 and the third three-way flow valve 8. At the same time, a volumetric flow meter 16 is installed at both ports of the first three-way flow valve 5. The volumetric flow meter 16 is used to collect flow information in its pipeline to achieve joint control of the first three-way flow valve 5 and the solenoid valve 10.

[0042] According to the above-described apparatus, the rapid hot-start method for the water electrolysis system of the present invention comprises the following two stages:

[0043] Rapid hot-start method: Hot electrolyte is stored in the inclined thermostatic precipitator tank 9. Due to the single-tank thermal storage characteristics, the upper part of the inclined thermostatic precipitator contains hot electrolyte, and the lower part contains cold electrolyte. The electrolyte in the buffer tank 2, electrolytic cell 1, and the entire electrolytic water system has cooled down after shutdown. When it is necessary to restart the electrolytic water system, open the first circulation pump 4, the second circulation pump 6, and the solenoid valve 10. Open the pipeline connecting the first three-way flow valve 5 to the upper part of the inclined thermostatic precipitator tank 9 and the first circulation pump 4, and close the pipeline connecting it to the buffer tank 2. Use the first circulation pump 4 to draw hot electrolyte from the upper part of the inclined thermostatic precipitator tank 9 and inject it into the electrolytic water system. Use the second circulation pump 6 to draw cooled electrolyte from the electrolyte system through the buffer tank 2 and inject it into the lower part of the inclined thermostatic precipitator tank 9. When the volumetric flow meter 16 detects that the volume of electrolyte injected into the electrolyzed water system has reached the electrolyte capacity required for normal system operation, the second circulation pump 6 and solenoid valve 10 are shut off, the pipeline connecting the first three-way flow valve 5 to the upper part of the inclined thermostatic storage tank 9 is closed, and the pipeline connected to the buffer tank 2 is opened. Through the above operations, the electrolyte in the system is replaced from cold to hot, achieving rapid hot start-up.

[0044] Electrolyte heating in the thermal storage tank: During normal system operation, the heat generated during electrolysis will raise the temperature of the electrolyte in the system. When the first temperature sensor 13 detects that the electrolyte temperature is higher than the normal operating temperature of the system, the pipes connecting the second three-way flow valve 7 and the third three-way flow valve 8 to the heat exchanger 3 are opened. When the second temperature sensor 14 detects that the electrolyte temperature in the inclined thermal storage tank 9 is lower than the set value, the pipes connecting the second three-way flow valve 7 to the third circulating pump 15 and the pipes connecting the third three-way flow valve 8 to the lower part of the inclined thermal storage tank 9 are opened. At this time, the cooled electrolyte in the inclined thermal storage tank 9 acts as the cooling medium of the heat exchanger 3, realizing the heating of the electrolyte in the inclined thermal storage tank 9 and the recovery of waste heat from the water electrolysis system. When the second temperature sensor 14 detects that the electrolyte temperature in the inclined thermosphere heat storage tank 9 has reached the set value, the pipeline connecting the second three-way flow valve 7 and the third circulation pump 15 is closed, the pipeline connected to the cooling water outlet 11 is opened, the pipeline connecting the third three-way flow valve 8 and the lower part of the inclined thermosphere heat storage tank 9 is closed, and the pipeline connected to the cooling water inlet 12 is opened, using cooling water as the cooling medium for the heat exchanger 3. This completes the recovery of system waste heat and the heating of the electrolyte in the heat storage tank, storing backup electrolyte for the next start-up and shutdown cycle.

[0045] A detailed explanation of the control scheme is provided using an alkaline water electrolysis system as an example:

[0046] The normal operating temperature of the alkaline water electrolysis system is 80–90°C. In the alkaline water electrolysis system, the resistance of the electrolyte is relatively high in the low-temperature zone. The current can only be used for the water electrolysis reaction when the electrolyte temperature is above 50°C. The electrolyte temperature stored in the inclined thermocline storage tank 9 is above 50°C, and rapid hot start-up of alkaline water electrolysis can be implemented according to the method of this invention.

[0047] Step 1: When restarting the water electrolysis system, open the first circulation pump 4, the second circulation pump 6, and the solenoid valve 10. Open the pipeline connecting the first three-way flow valve 5 to the upper part of the inclined thermosphere storage tank 9 and the first circulation pump 4, and close the pipeline connecting it to the buffer tank 2. The first circulation pump 4 draws hot electrolyte from the upper part of the inclined thermosphere storage tank 9 and injects it into the water electrolysis system. The second circulation pump 6 draws cooled electrolyte from the electrolyte system through the buffer tank 2 and injects it into the lower part of the inclined thermosphere storage tank 9. When the volumetric flow meter 16 detects that the volume of electrolyte injected into the water electrolysis system has reached the electrolyte capacity required for normal system operation, close the second circulation pump 6 and the solenoid valve 10, close the pipeline connecting the first three-way flow valve 5 to the upper part of the inclined thermosphere storage tank 9, and open the pipeline connecting it to the buffer tank 2. Through the above operations, the electrolyte in the system is replaced from cold to hot, achieving rapid hot start-up.

[0048] The second step: During normal system operation, the heat generated during electrolysis will raise the temperature of the electrolyte in the system. When the first temperature sensor 13 detects that the electrolyte temperature is higher than the normal operating temperature, the pipes connecting the second three-way flow valve 7 and the third three-way flow valve 8 to the heat exchanger 3 are opened. When the second temperature sensor 14 detects that the electrolyte temperature in the inclined thermostatic storage tank 9 is lower than the set value, the pipe connecting the second three-way flow valve 7 to the third circulation pump 15 and the pipe connecting the third three-way flow valve 8 to the lower part of the inclined thermostatic storage tank 9 are opened. At this time, the cooled electrolyte in the storage tank acts as the cooling liquid for the heat exchanger, realizing the heating of the electrolyte in the storage tank and the recovery of waste heat from the electrolysis water system. When the second temperature sensor 14 detects that the electrolyte temperature in the storage tank reaches the set value, the pipe connecting the second three-way flow valve 7 to the third circulation pump 15 is closed, the pipe connected to the cooling water outlet 11 is opened, the pipe connecting the third three-way flow valve 8 to the lower part of the inclined thermostatic storage tank 9 is closed, and the pipe connected to the cooling water inlet 12 is opened. This is done to recover waste heat from the system and heat the electrolyte in the heat storage tank, storing spare hot electrolyte for the next start-up and shutdown cycle.

[0049] In summary, this invention proposes to add a heat storage tank device, combined with a heat exchanger, and to effectively utilize the waste heat of the system itself and the cooling capacity of the electrolyte by having two sets of electrolytes operate alternately, thereby achieving rapid hot start-up of the water electrolysis hydrogen production system.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A rapid hot-start device for an electrolytic water system based on single-tank thermal storage technology, characterized in that, It includes an electrolytic cell (1), a buffer tank (2), a thermocline storage tank (9), and a heat exchanger (3); The water outlet of the electrolytic cell (1) is connected to the buffer tank (2), the buffer tank (2) is connected to the lower part of the inclined thermosphere heat storage tank (9), and a second circulation pump (6) is installed on the connecting pipeline; the buffer tank (2) is also connected to one port of the first three-way flow valve (5); the lower part of the inclined thermosphere heat storage tank (9) is also connected to one port of the third three-way flow valve (8); The upper part of the inclined temperature layer heat storage tank (9) is connected to the two ports of the first three-way flow valve (5), the three ports of the first three-way flow valve (5) are connected to the electrolytic water medium inlet of the heat exchanger (3), and a first circulation pump (4) is installed on the connecting pipeline. The electrolytic water medium outlet of the heat exchanger (3) is connected to the water inlet of the electrolytic cell (1). The upper part of the inclined temperature layer heat storage tank (9) is also connected to one port of the second three-way flow valve (7), and a third circulation pump (15) is installed on the connecting pipeline. The two ports of the second three-way flow valve (7) are connected to the cooling medium outlet of the heat exchanger (3), and the two ports of the third three-way flow valve (8) are connected to the cooling medium inlet of the heat exchanger (3).

2. The rapid hot-start device for an electrolytic water system based on single-tank thermal storage technology according to claim 1, characterized in that, The three ports of the second three-way flow valve (7) are connected to the cooling water outlet (11), and the three ports of the third three-way flow valve (8) are connected to the cooling water inlet (12).

3. The rapid hot-start device for an electrolytic water system based on single-tank thermal storage technology according to claim 1, characterized in that, The volume of the inclined thermosphere heat storage tank (9) is 1.5 to 2 times the electrolyte capacity required for normal operation of the water electrolysis system.

4. The rapid hot-start device for an electrolytic water system based on single-tank thermal storage technology according to claim 1, characterized in that, A first temperature sensor (13) is installed on the outlet pipe of the first circulating pump (4), and a second temperature sensor (14) is installed in the middle and lower part of the inclined thermosphere heat storage tank (9). The first temperature sensor (13) and the second temperature sensor (14) are used to collect temperature information and realize the joint control of the second three-way flow valve (7) and the third three-way flow valve (8).

5. The rapid hot-start device for an electrolytic water system based on single-tank thermal storage technology according to claim 1, characterized in that, A volumetric flow meter (16) is installed at the two ports of the first three-way flow valve (5). A solenoid valve (10) is installed on the connecting pipeline between the buffer tank (2) and the inclined temperature layer heat storage tank (9). The volumetric flow meter (16) is used to collect flow information and realize the joint control of the first three-way flow valve (5) and the solenoid valve (10).

6. A rapid hot-start method for an electrolytic water system based on single-tank thermal storage technology, implemented using the rapid hot-start device for an electrolytic water system based on single-tank thermal storage technology as described in any one of claims 1-5, characterized in that, Hot electrolyte is stored in the thermocline storage tank (9). When the original electrolyte in the buffer tank (2), electrolytic cell (1), and the entire water electrolysis system has cooled down, and the water electrolysis system needs to be started: Open the pipeline connecting the first three-way flow valve (5) to the upper part of the inclined temperature layer and the first circulation pump (4), and close the pipeline connecting it to the buffer tank (2); Turn on the first circulation pump (4) to extract the hot electrolyte from the upper part of the inclined temperature layer heat storage tank (9) and inject it into the electrolysis water system. Turn on the second circulation pump (6) to extract the cooled electrolyte from the electrolysis water system through the buffer tank (2) and inject it into the lower part of the inclined temperature layer heat storage tank (9). When the volume of electrolyte injected into the electrolyzed water system reaches the electrolyte capacity required for normal system operation, the second circulation pump (6) is turned off, the pipeline connecting the first three-way flow valve (5) to the upper part of the inclined temperature layer heat storage tank (9) is closed, and the pipeline connected to the buffer tank (2) is opened to complete the replacement of the electrolyte in the system from cold to hot, thereby achieving rapid hot start-up.

7. The rapid hot-start method for an electrolytic water system based on single-tank thermal storage technology according to claim 6, characterized in that, After the system is running normally, when the electrolyte temperature rises and affects the operation of the system, open the pipelines connecting the second three-way flow valve (7) and the third three-way flow valve (8) to the heat exchanger (3); When the temperature of the electrolyte in the inclined temperature layer heat storage tank (9) is lower than the set value, the pipeline connecting the second three-way flow valve (7) and the third circulation pump (15) and the pipeline connecting the third three-way flow valve (8) and the inclined temperature layer heat storage tank (9) are opened, and the electrolyte cooled in the inclined temperature layer heat storage tank (9) is used as the cooling medium of the heat exchanger (3) to realize the heating of the electrolyte in the inclined temperature layer heat storage tank (9) and the recovery of waste heat of the electrolytic water system; When the electrolyte temperature in the inclined thermosphere heat storage tank (9) reaches the set value, close the pipeline connecting the second three-way flow valve (7) and the third circulation pump (15), open the pipeline connected to the cooling water outlet (11), close the pipeline connecting the third three-way flow valve (8) and the lower part of the inclined thermosphere heat storage tank (9), open the pipeline connected to the cooling water inlet (12), and use cooling water as the cooling medium for the heat exchanger (3).

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