Hydrogen and heat combined supply integrated system based on normal-temperature solid hydrogen storage and working method of hydrogen and heat combined supply integrated system

Abstract

The hydrogen and heat combined supply integrated system comprises a hydrogen storage unit and a heat storage unit which are arranged in a container, the hydrogen storage unit and the heat storage unit are connected through a pipeline unit, the hydrogen storage unit adopts a solid hydrogen storage mode, and the heat storage unit comprises a heat pump device and a thermocline water tank connected with the heat pump device. The heat pump device and the thermocline water tank are connected with the hydrogen storage unit through the pipeline unit, and the thermocline water tank is used for achieving layered storage of cold water and hot water. Compared with the prior art, the energy loss of cold and hot water mixing can be reduced, the heat exchange efficiency is improved, seamless connection of hydrogen absorption and desorption processes is achieved, and the compactness of the whole hydrogen and heat combined supply system is improved.

Description

Technical Field

[0001] The present invention relates to the field of hydrogen-heat combined technology, and in particular to a hydrogen-heat combined supply integrated system based on room-temperature solid-state hydrogen storage and a working method thereof. Background Art

[0002] As the world's demand for reducing carbon emissions and transforming the energy structure increases, the potential of hydrogen as a clean energy source has gradually gained attention. Hydrogen has a high energy density and its only combustion product is water, so it has become an important component of future sustainable energy. Traditional energy production methods are mostly concentrated in large-scale power stations, while distributed energy systems (such as small-scale combined heat and power systems in homes and commercial buildings) are gaining more and more attention. As an efficient and flexible form of energy, hydrogen can be widely used in these systems to provide electricity and heat. With the development of hydrogen production, storage, transportation and utilization technology, the feasibility of hydrogen combined heat and power technology has been greatly improved. In particular, the advancement of hydrogen fuel cells has significantly improved the power conversion efficiency of hydrogen, making it possible to use it in combined heat and power systems.

[0003] The hydrogen heat cogeneration system can provide electricity and heat at the same time, and use the heat in the system to improve energy utilization efficiency. Compared with traditional independent electricity production and heat supply methods, the hydrogen heat cogeneration system can greatly improve the overall energy efficiency. Hydrogen forms metal hydrides through chemical reactions for solid storage, so it can provide a stable source of energy supply, especially suitable for environments with large load fluctuations. In addition, the hydrogen heat cogeneration system is suitable for distributed energy networks and can be deployed in residential areas, commercial areas, industrial parks, etc., reducing the losses incurred during long-distance power transmission and improving the efficiency of local energy use. Using hydrogen as an energy source, especially when combined with renewable energy (such as wind energy and solar energy) to produce hydrogen, can achieve relative energy independence and reduce dependence on traditional fossil fuels.

[0004] Compared with high-pressure hydrogen storage (high hydrogen pressure and low safety), solid-state hydrogen storage has the advantages of safety, stability and high efficiency. However, in order to ensure the stable operation of hydrogen absorption and desorption, solid-state hydrogen storage often needs to release and absorb a large amount of heat, so that the heat storage system must be equipped with two large water tanks, one cold and one hot. For example, Chinese patent CN118900089A discloses a cogeneration system, which is provided with a water circulation device, including a high-temperature water tank, a low-temperature water tank and a heating water tank, which are used to assist the heat conversion of the solid-state hydrogen storage device. This method undoubtedly increases the overall size and volume of the system, and is prone to heat mixing, resulting in low heat exchange efficiency, which is not conducive to the seamless connection of the hydrogen absorption and desorption process. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a hydrogen-heat cogeneration integrated system based on room-temperature solid-state hydrogen storage and its working method, which can improve the compactness of the entire system, reduce heat mixing, improve heat exchange efficiency, and achieve seamless connection of hydrogen absorption and desorption processes.

[0006] The objective of the present invention can be achieved through the following technical solutions: a hydrogen-heat cogeneration integrated system based on room-temperature solid-state hydrogen storage, comprising a hydrogen storage unit and a heat storage unit arranged inside a container, the hydrogen storage unit and the heat storage unit being interconnected by a pipeline unit, the hydrogen storage unit adopts a solid-state hydrogen storage method, the heat storage unit comprises a heat pump device and a thermoclimatic layer water tank connected thereto, the heat pump device and the thermoclimatic layer water tank are respectively connected to the hydrogen storage unit by a pipeline unit, and the thermoclimatic layer water tank is used to realize stratified storage of cold and hot water.

[0007] Furthermore, a plurality of partitions are provided in the temperature-inclined layer water tank to form a heat-insulating flow channel and reduce heat exchange and loss caused by flow and heat conduction in the vertical direction.

[0008] Furthermore, the hydrogen storage unit includes a plurality of hydrogen storage tanks, the hydrogen storage tanks are filled with solid hydrogen storage alloy materials and heat exchange structures, and the hydrogen storage tanks are connected with external flanges.

[0009] Furthermore, the multiple hydrogen storage tanks are all fixedly placed in the container in a suspended form.

[0010] Furthermore, the heat exchange structure includes a 304 stainless steel U-shaped heat exchange tube and an aluminum alloy topology optimized fin sleeved outside the tube.

[0011] Furthermore, the outer shell of the container is designed to be skid-mounted in the open air to avoid the risk of explosion caused by accumulation of hydrogen leakage.

[0012] Furthermore, the heat pump device includes an evaporator and a condenser, the evaporator is connected to the lower area of ​​the thermocline water tank, and the condenser is connected to the upper area of ​​the thermocline water tank.

[0013] A working method of a hydrogen-heat cogeneration integrated system based on room-temperature solid-state hydrogen storage, including seamless hydrogen absorption and release processes, to achieve a cyclic supply of hydrogen and heat.

[0014] Furthermore, the hydrogen absorption process is specifically as follows: in the hydrogen storage unit, hydrogen exists in the metal hydride in the form of a solid solution through a chemical reaction. This process generates a large amount of heat. At this time, cold water flows from the lower area of ​​the thermocline water tank through the pipeline unit into the hydrogen storage tank as a cooling medium. After the outlet water releases heat through the hydrogen storage unit, a part of the water is converted into high-temperature water after heating through the condenser of the heat pump device and is merged into the upper area of ​​the thermocline water tank for retention. The other part of the water is cooled down to low-temperature water through the evaporator of the heat pump device and continues to be merged into the lower area of ​​the thermocline layer for circulating supply of low-temperature water. As the hydrogen absorption reaction continues, the high-temperature water in the upper area of ​​the thermocline water tank gradually increases, and the low-temperature water in the lower area is gradually consumed. Finally, at the end of the entire hydrogen absorption process, the inside of the thermocline water tank is all high-temperature water after heating, which is directly used in the subsequent hydrogen release process.

[0015] Furthermore, the hydrogen release process is specifically as follows: after obtaining energy, the metal hydride will decompose into a hydrogen storage alloy and release hydrogen again. This process will absorb a large amount of heat. At this time, high-temperature water flows from the upper area of ​​the thermocline water tank through the pipeline unit into the hydrogen storage tank as a heating medium. After the outlet water absorbs heat through the hydrogen storage unit, it enters the heat pump device. Part of the water is converted into low-temperature cooling water through the evaporator and merged into the lower area of ​​the thermocline water tank. The other part of the water is converted into high-temperature water through the condenser and merged into the upper area of ​​the thermocline water tank for circulation supply. As the hydrogen release reaction continues, the high-temperature water in the upper area of ​​the thermocline water tank is gradually consumed, and the low-temperature water in the lower area is gradually increased. Finally, after the entire hydrogen release process is completed, the interior of the thermocline water tank is basically filled with cooled low-temperature water, which is directly used for a new round of hydrogen absorption process.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The present invention arranges a hydrogen storage unit and a heat storage unit in a container, wherein the hydrogen storage unit and the heat storage unit are interconnected by a pipeline unit, the hydrogen storage unit adopts a solid-state hydrogen storage method, and the heat storage unit comprises a heat pump device and a temperature-slope layer water tank connected thereto, and the temperature-slope layer water tank is used to realize stratified storage of cold and hot water to meet the needs for cold and hot water respectively in the process of hydrogen absorption and desorption, thereby greatly reducing the size and volume of the integrated hydrogen heat cogeneration system, so that the entire system can realize a continuous and convenient hydrogen storage and desorption process within the size of a single container, which can reduce heat mixing, improve heat exchange efficiency, realize seamless connection of hydrogen absorption and desorption processes, and improve the compactness of the entire hydrogen heat cogeneration system.

[0018] The present invention arranges the container shell in an open-air skid-mounted form, which, on the one hand, serves as the physical boundary of the entire hydrogen heat cogeneration system, and on the other hand, avoids the hidden dangers such as the danger of hydrogen accumulation caused by hydrogen leakage inside the container.

[0019] The present invention arranges a plurality of partitions inside the inclined temperature layer water tank to form an insulating flow channel, which plays a role of drainage and can reduce the heat exchange and loss caused by the flow and heat conduction of cold and hot water in the vertical direction, so that the stratification of cold and hot water in the inclined temperature layer water tank can be maintained for a longer time, effectively avoiding the energy loss caused by the mixing of cold and hot water and avoiding the excessive mixing of temperatures inside the inclined temperature layer water tank, which leads to unclear temperature stratification.

[0020] In the present invention, when the hydrogen absorption process is in progress, cold water flows from the lower area of ​​the thermocline water tank into the hydrogen storage tank as a cooling medium. After the outlet water releases heat through the hydrogen storage unit, a part of the water is converted into high-temperature water after being heated through the condenser and is merged into the upper area of ​​the thermocline water tank for retention, and the other part of the water is cooled down into low-temperature water through the evaporator and continues to be merged into the lower area of ​​the thermocline for circulating supply of low-temperature water. As the hydrogen absorption reaction continues, the high-temperature water in the upper area of ​​the thermocline water tank gradually increases, and the low-temperature water in the lower area is gradually consumed. Finally, at the end of the entire hydrogen absorption process, the interior of the thermocline water tank is all high-temperature water after the temperature is raised, so it can be directly used for subsequent Hydrogen release process: During the hydrogen release process, high-temperature water flows from the upper area of ​​the thermocline water tank into the hydrogen storage tank as a heating medium. After the outlet water absorbs heat through the hydrogen storage unit, part of the water is converted into low-temperature cooling water through the evaporator and merged into the lower area of ​​the thermocline water tank. The other part of the water is passed through the condenser and merged into the upper area of ​​the thermocline water tank as high-temperature water for circulation supply. As the hydrogen release reaction continues, the high-temperature water in the upper area of ​​the thermocline water tank is gradually consumed, and the low-temperature water in the lower area gradually increases. Finally, after the entire hydrogen release process is completed, the interior of the thermocline water tank is basically filled with cooled low-temperature water, so it can be directly used for a new round of hydrogen absorption process. This achieves a seamless hydrogen absorption and desorption process, which can realize the circulation supply of hydrogen and heat, improve system performance, and reduce system energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1a and 1b It is a schematic diagram of the system connection structure of the present invention;

[0022] Figure 2 This is a front view of the interior of the container of the present invention;

[0023] Figure 3 This is a side view of the interior of the container of the present invention;

[0024] Figure 4 This is a top view of the interior of the container in the present invention;

[0025] Explanation of the markings in the figure: 1. flange, 2. hydrogen storage unit, 3. container, 4. piping unit, 5. heat pump device, 6. inclined temperature layer water tank. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example

[0028] like Figure 1a , 1b as well as Figure 2 , 3 As shown in , a hydrogen-heat cogeneration integrated system based on room-temperature solid-state hydrogen storage includes a hydrogen storage unit 2 and a heat storage unit arranged inside a container 3. The hydrogen storage unit 2 and the heat storage unit are interconnected via a pipeline unit 4 (including a gas path for hydrogen to flow and a water path for cold and hot water to flow). The hydrogen storage unit 2 adopts a solid-state hydrogen storage method. The heat storage unit includes a heat pump device 5 and a thermocline layer water tank 6 connected thereto. The heat pump device 5 and the thermocline layer water tank 6 are respectively connected to the hydrogen storage unit 2 via the pipeline unit 4. The thermocline layer water tank 6 is used to realize stratified storage of cold and hot water.

[0029] The hydrogen storage unit 2 is mainly composed of 4-6 hydrogen storage tanks, each of which can store about 15-25kg of hydrogen. The hydrogen storage tank is filled with hydrogen storage materials and heat exchange structures (including 304 stainless steel U-shaped heat exchange tubes and aluminum alloy topology optimized fins on the outside), and hot and cold water flows through the heat exchange tubes as hot and cold water channels. A certain amount of solid hydrogen storage alloy material is filled inside the hydrogen storage tank. When a hydrogen absorption reaction occurs, the hydrogen storage tank will absorb hydrogen through a chemical reaction and store it in the hydrogen storage alloy to form a metal hydride. This process will generate a large amount of heat, which is used to heat the circulating water and is stored in the circulating water as energy. The reverse process of the hydrogen absorption process is the hydrogen release process. The hydrogen release process needs to absorb external heat to proceed. Therefore, after the hydrogen absorption process is completed, the heat stored in the circulating water can be used as energy input to resupply the hydrogen storage tank, so that the metal hydride decomposes and turns into a hydrogen storage alloy again and releases hydrogen. In this embodiment, the hydrogen storage tanks are fixedly placed in the container 3 in a suspended form to facilitate subsequent maintenance. The internal filling material of the hydrogen storage tank is AB2 type titanium-based hydrogen storage alloy, and the outer shell material of the hydrogen storage tank is Q345R carbon steel.

[0030] A hydrogen delivery pipe and flange 1 are welded on the shell of the hydrogen storage tank. The hydrogen delivery pipe serves as a hydrogen absorption and discharge channel. The external flange 1 is connected to the water channel of the pipeline unit 4 through a hose. In this embodiment, the hydrogen delivery pipe is made of No. 20 steel, and a filter is provided at the end of the hydrogen delivery pipe to remove alloy powder that may be carried in the hydrogen flow. The material of the flange 1 is 20Ⅱ forged steel. The external pipeline part of the flange 1 is provided with a valve to control the on-off state. The flange 1 is connected to the pipeline by bolts and is equipped with a gasket to achieve a sealing effect.

[0031] The heat storage unit is mainly composed of a heat pump device 5 and a thermoclimatic layer water tank 6, which is used for energy quality improvement and multi-energy complementation. After absorbing and releasing heat, the heat medium water flows through the evaporator and condenser of the heat pump device 5 respectively to become high-temperature water and low-temperature water, and enters the upper and lower areas of the thermoclimatic layer water tank 6 for recycling and energy storage. This solution uses a single thermoclimatic layer water tank 6 for heat storage. The thermoclimatic layer water tank 6 replaces the conventional hot and cold water tank. The use of this type of water tank can realize the stratified storage of hot and cold water, so as to meet the needs of hot and cold water in the process of hydrogen absorption and desorption. In order to avoid the temperature stratification being unclear due to excessive mixing of the temperature inside the thermoclimatic layer water tank 6, this solution sets a plurality of partitions inside the thermoclimatic layer water tank 6 to form a drainage effect, and at the same time can reduce the heat transfer of hot and cold water in the vertical direction and prevent excessive heat exchange of hot and cold water in the vertical direction. The presence of the partition can make the stratification of hot and cold water in the thermoclimatic layer water tank 6 last longer. During the hydrogen absorption process, cold water flows from the lower area of ​​the thermocline layer water tank 6 through the pipeline unit 4 into the hydrogen storage tank as a cooling medium. After the outlet water is heated by hydrogen storage, a part of the water is heated by the condenser to become high-temperature water and merged into the upper area of ​​the thermocline layer water tank 6, and the other part is cooled by the evaporator to become low-temperature water and merged into the lower area of ​​the thermocline layer water tank 6 for circulation supply. Finally, after the entire hydrogen absorption process is completed, the interior of the thermocline layer water tank 6 is all high-temperature water after quality improvement, and the subsequent hydrogen release process can be directly carried out; the hydrogen release process is similar, hot water flows from the upper area of ​​the thermocline layer water tank 6 through the pipeline unit 4 into the hydrogen storage tank as a heating medium. After the outlet water absorbs heat through hydrogen storage, a part of the water is converted into low-temperature cooling water by the evaporator and merged into the lower area of ​​the thermocline layer water tank 6, and the other part of the water is heated by the condenser to become high-temperature water and enters the upper area of ​​the thermocline layer water tank 6 for circulation supply. Finally, after the entire hydrogen release process is completed, the interior of the thermocline layer water tank 6 is all cooled low-temperature water, which can be directly used for the next round of hydrogen absorption process.

[0032] In this embodiment, the shell material of the inclined temperature layer water tank 6 is 304 stainless steel, and the internal partition material is ABS plastic resin. Multi-layer ABS plastic partitions are used to form an insulating flow channel and reduce heat exchange and loss caused by flow and heat conduction in the vertical direction.

[0033] In addition, the outer shell material of container 3 is 304 stainless steel, and container 3 is designed to be skid-mounted in the open air. On the one hand, it serves as the physical boundary of the entire hydrogen heat cogeneration system, and on the other hand, it avoids the hidden dangers of hydrogen accumulation caused by hydrogen leakage inside the container. In this embodiment, the outer shell is also coated with thermal insulation material to isolate the heat exchange between the tank body and the water tank and the outside world, so that the temperature inside the device can be maintained stable for a longer time.

[0034] The above system is applied in practice. Before the hydrogen absorption process begins, cooling water must first be passed through the U-shaped heat exchange tube for pre-cooling, and then hydrogen is introduced through the hydrogen transfer pipe under the condition of continuous introduction of cooling water. The hydrogen gradually diffuses into the hydrogen storage material, and the hydrogen absorption process occurs at this time. At that time, the cooling water carries part of the heat released by the hydrogen absorption reaction and the temperature rises. After sufficient heat exchange through the U-shaped heat exchange tube, it flows into the heat pump device, most of which will be further cooled to low-temperature water by the evaporator and flow into the lower layer of the inclined layer water tank for recycling. A small part of the water will be heated to high-temperature water by the condenser and flow into the upper layer of the inclined layer water tank for storage. As the hydrogen absorption reaction continues, the high-temperature water in the upper layer of the inclined layer water tank gradually increases, and the low-temperature water in the lower layer is gradually consumed. Finally, at the end of the entire hydrogen absorption process, the inside of the inclined layer water tank is all heated high-temperature water.

[0035] Before the hydrogen release process begins, high-temperature water is first passed into the U-shaped heat exchange tube through a connecting pipe for preheating. Then, under the condition of continuous passage of high-temperature water, the metal hydride is thermally decomposed and hydrogen is desorbed. At this time, the hydrogen storage unit is able to release hydrogen outward under a certain back pressure. At that time, the heat carried by the heated water is absorbed by the metal hydride, and its temperature is significantly reduced. After sufficient heat exchange through the U-shaped heat exchange tube, it flows into the heat pump device. Most of the water will be further heated to high-temperature water by the evaporator and flow into the inclined temperature layer water tank for recycling. A small part of the water will be cooled to low-temperature water by the evaporator and flow into the lower layer of the inclined temperature layer water tank for storage. As the hydrogen release reaction continues, the high-temperature water in the upper layer of the inclined temperature layer water tank is gradually consumed, and the low-temperature water in the lower layer gradually increases. Finally, after the entire hydrogen release process is completed, the interior of the inclined temperature layer water tank is filled with cooled low-temperature water.

[0036] In summary, this solution, by introducing a temperature-slope layer water tank, transforms the original two large water tanks, one cold and one hot, that must be equipped in the heat storage system into a single integrated cold and hot water tank that can be circulated and converted, greatly reducing the size and volume of the integrated hydrogen heat cogeneration system, allowing the entire system to achieve continuous and convenient hydrogen storage and release processes within the size of a single container, which can optimize system performance, reduce heat mixing, improve heat exchange efficiency, achieve seamless connection of hydrogen absorption and release processes, improve the compactness and portability of the entire hydrogen heat cogeneration system, reduce energy consumption and increase equipment life, thereby facilitating subsequent transportation and maintenance, and providing ideas for promoting the further industrialization of compact solid-state hydrogen storage and hydrogen heat cogeneration devices.

Claims

1. A hydrogen-heat cogeneration integrated system based on room temperature solid-state hydrogen storage, characterized in that: The invention comprises a hydrogen storage unit (2) and a heat storage unit arranged inside a container (3); the hydrogen storage unit (2) and the heat storage unit are connected to each other via a pipeline unit (4); the hydrogen storage unit (2) adopts a solid-state hydrogen storage method; the heat storage unit comprises a heat pump device (5) and a thermocline water tank (6) connected thereto; the heat pump device (5) and the thermocline water tank (6) are respectively connected to the hydrogen storage unit (2) via the pipeline unit (4); the thermocline water tank (6) is used to realize stratified storage of cold and hot water.

2. The hydrogen-heat cogeneration integrated system based on room temperature solid-state hydrogen storage according to claim 1 is characterized in that: A plurality of partitions are arranged inside the thermocline water tank (6) to form a heat-insulating flow channel and reduce heat exchange and loss caused by flow and heat conduction in the vertical direction.

3. The hydrogen-heat cogeneration integrated system based on room temperature solid-state hydrogen storage according to claim 1 is characterized in that: The hydrogen storage unit (2) comprises a plurality of hydrogen storage tanks, wherein the hydrogen storage tanks are filled with solid hydrogen storage alloy material and a heat exchange structure, and the hydrogen storage tanks are connected to an external flange (1).

4. The hydrogen-heat cogeneration integrated system based on room temperature solid-state hydrogen storage according to claim 3 is characterized in that: The multiple hydrogen storage tanks are all fixedly placed in the container (3) in a suspended manner.

5. The hydrogen-heat cogeneration integrated system based on room temperature solid-state hydrogen storage according to claim 3 is characterized in that: The heat exchange structure comprises a 304 stainless steel U-shaped heat exchange tube and an aluminum alloy topology optimized fin sleeved on the outside thereof.

6. The hydrogen-heat cogeneration integrated system based on room temperature solid-state hydrogen storage according to claim 1 is characterized in that: The outer shell of the container (3) is designed to be skid-mounted in the open air to avoid the risk of explosion caused by accumulation of hydrogen leakage.

7. The hydrogen-heat cogeneration integrated system based on room temperature solid-state hydrogen storage according to claim 3 is characterized in that: The heat pump device (5) comprises an evaporator and a condenser, wherein the evaporator is connected to the lower region of the thermocline water tank (6), and the condenser is connected to the upper region of the thermocline water tank (6).

8. A working method of a hydrogen-heat cogeneration integrated system based on room-temperature solid-state hydrogen storage, applied to a hydrogen-heat cogeneration integrated system based on room-temperature solid-state hydrogen storage as claimed in claim 7, characterized in that: It includes seamless hydrogen absorption and release processes to achieve a cyclic supply of hydrogen and heat.

9. The hydrogen-heat cogeneration integrated system based on room temperature solid-state hydrogen storage according to claim 8, characterized in that: The hydrogen absorption process is specifically as follows: in the hydrogen storage unit (2), hydrogen exists in the metal hydride in the form of a solid solution through a chemical reaction. This process generates a large amount of heat. At this time, cold water flows from the lower area of ​​the thermocline water tank (6) through the pipeline unit (4) into the hydrogen storage tank as a cooling medium. After the outlet water releases heat through the hydrogen storage unit (2), a part of the water is converted into high-temperature water after being heated through the condenser of the heat pump device (5) and then flows into the upper area of ​​the thermocline water tank (6) for retention. The other part of the water is cooled down to low-temperature water through the evaporator of the heat pump device (5) and then flows into the lower area of ​​the thermocline for circulation supply of low-temperature water. As the hydrogen absorption reaction continues, the high-temperature water in the upper area of ​​the thermocline water tank (6) gradually increases, and the low-temperature water in the lower area is gradually consumed. Finally, when the entire hydrogen absorption process is completed, the interior of the thermocline water tank (6) is filled with high-temperature water after being heated, which is directly used in the subsequent hydrogen release process.

10. The hydrogen-heat cogeneration integrated system based on room temperature solid-state hydrogen storage according to claim 8, characterized in that: The dehydrogenation process is specifically as follows: after obtaining energy, the metal hydride will decompose into a hydrogen storage alloy and release hydrogen again. This process will absorb a large amount of heat. At this time, high-temperature water flows from the upper area of ​​the thermocline water tank (6) through the pipeline unit (4) into the hydrogen storage tank as a heating medium. After the outlet water passes through the hydrogen storage unit (2) to absorb heat, it enters the heat pump device (5). A part of the water is converted into low-temperature cooling water through the evaporator and flows into the lower area of ​​the thermocline water tank (6). The other part of the water is converted into high-temperature water through the condenser and flows into the upper area of ​​the thermocline water tank (6) for circulation supply. As the dehydrogenation reaction continues, the high-temperature water in the upper area of ​​the thermocline water tank (6) is gradually consumed, and the low-temperature water in the lower area is gradually increased. Finally, after the entire dehydrogenation process is completed, the interior of the thermocline water tank (6) is basically filled with cooled low-temperature water, which is directly used for a new round of hydrogen absorption process.

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