Water storage and heat release system, its voltage stabilizing device and voltage stabilizing method

Abstract

An embodiment of the present invention discloses a water storage and heat release system, its pressure stabilizing device and pressure stabilizing method. The pressure stabilizing device includes: a pressure stabilizing container for storing a pressure maintaining gas; a boosting unit, the input end of the boosting unit is connected to the pressure stabilizing container, and the output end of the boosting unit is used to connect to the heat storage medium storage unit of the water storage and heat release system; the boosting unit is used to boost the pressure maintaining gas stored in the pressure stabilizing container and transport it to the heat storage medium storage unit when the pressure of the heat storage medium storage unit is lower than a first preset pressure; an output unit, the output end of the output unit is connected to the pressure stabilizing container, and the input end of the output unit is used to connect to the heat storage medium storage unit; the output unit is used to receive the pressure maintaining gas output from the heat storage medium storage unit and transport it to the pressure stabilizing container for storage when the pressure of the heat storage medium storage unit is higher than the first preset pressure. The embodiment of the present invention can enable the pressure maintaining gas to circulate and interact between the heat storage medium storage unit and the pressure stabilizing container, ensuring safe and stable operation.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and in particular, to a water heat storage and release system and its pressure stabilizing device, as well as a pressure stabilizing method. Background Art

[0002] The carbon dioxide energy storage system mainly uses carbon dioxide as the circulating working medium. The specific structure of the carbon dioxide energy storage system can be understood by referring to the carbon dioxide energy storage devices / systems disclosed in Chinese Patent Publication Nos. CN112985143B, CN112985144B, CN112985145B, and CN114109549B. During energy storage, the compressor is driven by an electric motor to compress and boost the low-pressure carbon dioxide. The compressed high-temperature and high-pressure carbon dioxide is cooled by the heat storage medium of the heat storage and release system (i.e., the heat exchange component), and at the same time, the heat storage medium is heated. After the heat exchange is completed, the high-pressure carbon dioxide and the high-temperature heat storage medium are stored separately. That is, in this process, electrical energy is converted into the pressure potential energy of carbon dioxide and the thermal energy of the heat storage medium. During energy release, the high-pressure carbon dioxide is heated and raised in temperature by the high-temperature heat storage medium, then enters the turbine to drive the turbine to do work and generate electricity. The carbon dioxide is depressurized, and the heat storage medium is cooled. That is, the pressure potential energy of carbon dioxide and the thermal energy of the heat storage medium are converted into electrical energy and output, completing an energy storage and release cycle.

[0003] Common heat storage media include molten salt, heat transfer oil, and water, which are used to achieve heat energy conversion during the energy storage and release stages. During use, molten salt is affected by the intermittent operation of the energy storage system, resulting in solidification of the molten salt, blockage of pipelines, and production accidents. As a bulk product, heat transfer oil is significantly affected by international crude oil prices and varies significantly with the capacity and duration of the energy storage system. Especially, it accounts for a significant proportion in the investment cost of long-duration energy storage systems. At the same time, heat transfer oil is a flammable liquid, and once it leaks and comes into contact with air, it is easy to catch fire, posing a huge safety hazard during use. And once heat transfer oil leaks, it will cause greater pollution to the environment. Replacing molten salt and heat transfer oil with pressurized water can solve many problems during use, but how to prevent large pressure fluctuations in the water storage tank during the heat storage and release process is a problem that needs to be overcome. Using compressed air for pressure maintenance causes a large amount of waste of high-pressure air during use, which is extremely uneconomical. Summary of the Invention

[0004] Therefore, in order to solve the problem of pressure stabilization required for the water storage tank when high-pressure water is used as the heat storage medium in the prior art, the embodiments of the present invention provide a water heat storage and release system and its pressure stabilizing device and pressure stabilizing method. Through the pressure stabilizing device, it is possible to realize that during the energy storage and release cycle, the pressure maintaining gas circulates between the heat storage medium storage unit and the pressure stabilizing container to maintain the pressure stability of the heat storage medium storage unit, ensuring the safe and stable operation of the water heat storage and release system.

[0005] An embodiment of the present invention provides a pressure stabilizing device for a water energy storage and heat release system, comprising: a pressure stabilizing container for storing a pressure maintaining gas; a boosting unit, the input end of the boosting unit is connected to the pressure stabilizing container, and the output end of the boosting unit is used to be connected to the heat storage medium storage unit of the water energy storage and heat release system; the boosting unit is used to boost the pressure maintaining gas stored in the pressure stabilizing container and deliver it to the heat storage medium storage unit when the pressure of the heat storage medium storage unit is lower than a first preset pressure; an output unit, the output end of the output unit is connected to the pressure stabilizing container, and the input end of the output unit is used to be connected to the heat storage medium storage unit; the output unit is used to receive the pressure maintaining gas output from the heat storage medium storage unit and deliver it to the pressure stabilizing container for storage when the pressure of the heat storage medium storage unit is higher than the first preset pressure.

[0006] An embodiment of the present invention further provides a water energy storage and heat release system, comprising the pressure stabilizing device described in the foregoing embodiment, and further comprising an inlet water pipeline and an outlet water pipeline. The inlet water pipeline includes an inlet water main pipe and a plurality of inlet water branch pipes respectively connected to the plurality of storage tanks in one-to-one correspondence, and the plurality of inlet water branch pipes are respectively connected to the inlet water main pipe; the outlet water pipeline includes an outlet water main pipe and a plurality of outlet water branch pipes respectively connected to the plurality of storage tanks in one-to-one correspondence, and the plurality of outlet water branch pipes are respectively connected to the outlet water main pipe;

[0007] The water energy storage and heat release system further includes an energy storage heat exchanger. The outlet water main pipe is used to be connected to the inlet end of the energy storage heat exchanger, and the inlet water main pipe is used to be connected to the outlet end of the energy storage heat exchanger; the inverted tank and the constant pressure cold tank are used to output the low-temperature water to the outlet water main pipe through the outlet water branch pipes and heat it up to high-temperature water via the energy storage heat exchanger during the heat storage stage, and the constant pressure hot tank and the inverted tank are used to receive the high-temperature water output from the energy storage heat exchanger to the inlet water main pipe through the inlet water branch pipes during the heat storage stage;

[0008] The water energy storage and heat release system further includes an energy release heat exchanger. The outlet water main pipe is connected to the inlet end of the energy release heat exchanger, and the inlet water main pipe is used to be connected to the outlet end of the energy release heat exchanger; the inverted tank and the constant pressure hot tank are used to output the high-temperature water to the outlet water main pipe through the outlet water branch pipes and release heat to cool it down to low-temperature water via the energy release heat exchanger during the heat release stage, and the constant pressure cold tank and the inverted tank are used to receive the low-temperature water output from the energy release heat exchanger to the inlet water main pipe through the inlet water branch pipes during the heat release stage.

[0009] An embodiment of the present invention further provides a water storage and heat release system, which includes the pressure stabilizing device described in the foregoing embodiment, and further includes a hot water pipeline and a cold water pipeline; the hot water pipeline includes a hot water main pipe and a plurality of hot water branch pipes respectively connected to the plurality of storage tanks in one-to-one correspondence, and the plurality of hot water branch pipes are respectively connected to the hot water main pipe; the cold water pipeline includes a cold water main pipe and a plurality of cold water branch pipes respectively connected to the plurality of storage tanks in one-to-one correspondence, and the plurality of cold water branch pipes are respectively connected to the cold water main pipe;

[0010] The water storage and heat release system further includes a heat storage heat exchanger, the cold water main pipe is used to connect the inlet end of the heat storage heat exchanger, and the hot water main pipe is used to connect the outlet end of the heat storage heat exchanger; the inverted tank and the constant pressure cold tank are used to output the low-temperature water through the cold water branch pipes during the heat storage stage and transport it to the heat storage heat exchanger through the cold water main pipe to be heated into high-temperature water, and the constant pressure hot tank and the inverted tank are used to receive the high-temperature water output from the heat storage heat exchanger to the hot water main pipe through the hot water branch pipes during the heat storage stage; the water storage and heat release system further includes a heat release heat exchanger, the cold water main pipe is used to connect the outlet end of the heat release heat exchanger, and the hot water main pipe is used to connect the inlet end of the heat release heat exchanger; the inverted tank and the constant pressure hot tank are used to output the high-temperature water through the hot water branch pipes during the heat release stage and transport it to the heat release heat exchanger through the hot water main pipe to be cooled into low-temperature water, and the constant pressure cold tank and the inverted tank are used to receive the low-temperature water output from the heat release heat exchanger to the cold water main pipe through the cold water branch pipes during the heat release stage.

[0011] An embodiment of the present invention further provides a pressure stabilizing method for a water storage and heat release system. Based on the pressure stabilizing device for a water storage and heat release system described in any one of the foregoing, the pressure stabilizing method includes: when the pressure in the heat storage medium storage unit is lower than a first preset pressure, the pressurizing unit pressurizes the pressure maintaining gas stored in the pressure stabilizing container and transports it to the heat storage medium storage unit; when the pressure in the heat storage medium storage unit is higher than the first preset pressure, the output unit receives the pressure maintaining gas output from the heat storage medium storage unit and transports it to be stored in the pressure stabilizing container.

[0012] As can be seen from the above, the above embodiments of the present invention can achieve one or more of the following beneficial effects:

[0013] (1) By providing a pressure stabilizing container in the pressure stabilizing device, the pressure maintaining gas can be stored, and through the pressurizing unit and the output unit, a closed-loop connection between the pressure stabilizing container and the heat storage medium storage unit of the water storage and heat release system can be realized, so that the pressure maintaining gas can circulate and interact between the pressure stabilizing container and the heat storage medium storage unit during the heat storage and heat release cycle process to stabilize the pressure of the heat storage medium storage unit and ensure the safe and stable operation of the water storage and heat release system.

[0014] (2) The pressure - maintaining gas in the pressure - stabilizing device circulates within the water storage and heat - release system and is not discharged to the outside. It is replenished once and has no consumption. Brief Description of the Drawings

[0015] The specific embodiments of the present invention will be described in detail below with reference to the drawings.

[0016] Figure 1 It is a schematic structural diagram of a pressure - stabilizing device for a water storage and heat - release system provided by an embodiment of the present invention.

[0017] Figure 2 It is a schematic structural diagram of a pressure - stabilizing device for a water storage and heat - release system provided by another embodiment of the present invention.

[0018] Figure 3 It is a schematic structural diagram of a pressure - stabilizing device for a water storage and heat - release system provided by another embodiment of the present invention.

[0019] Figure 4 It is a schematic structural diagram of a pressure - stabilizing device for a water storage and heat - release system provided by another embodiment of the present invention.

[0020] Figure 5 It is a schematic structural diagram of a pressure - stabilizing device for a water storage and heat - release system provided by another embodiment of the present invention.

[0021] Figure 6 It is a schematic structural diagram of a pressure - stabilizing device for a water storage and heat - release system provided by another embodiment of the present invention

[0022] Figure 7 It is a schematic structural diagram of a pressure - stabilizing device for a water storage and heat - release system provided by another embodiment of the present invention.

[0023] Figure 8 It is a schematic structural diagram of a water storage and heat - release system provided by a specific embodiment of the present invention.

[0024] Figure 9 It is a schematic structural diagram of a water storage and heat - release system provided by another specific embodiment of the present invention.

[0025]

Description of the Reference Numerals

[0026] 10: Voltage stabilizing section; 11: Voltage stabilizing container; 12: Boosting unit; 12a: Input end; 12b: Output end; 121: Boosting pump; 122: Isolation valve; 123: First air supplement valve; 124: Second air supplement valve; 125: First cooling element; 126: Boosting pipeline; 13: Output unit; 13a: Input end; 13b: Output end; 131: Voltage stabilizing valve; 132: Balance valve; 133: Second cooling element; 134: Output pipeline; 14: Control valve; 20: Heat storage medium storage unit; 21a: Constant pressure hot tank, 21b: Inverted tank; 21c: Constant pressure cold tank; 211: First tank; 212: Second tank; 213: Third tank; 214: Fourth tank; 31: Energy storage heat exchanger; 33: Energy storage pump; 41: Energy release heat exchanger; 43: Energy release pump; 51: Water inlet pipeline; 511: Water inlet main pipe; 512: Water inlet branch pipe; 52: Water outlet pipeline; 521: Water outlet main pipe; 522: Water outlet branch pipe; 53: Hot water pipeline; 531: Hot water main pipe; 532: Hot water branch pipe; 54: Cold water pipeline; 541: Cold water main pipe; 542: Cold water branch pipe; 61: First water outlet valve; 62: Second water outlet valve; 63: Third water outlet valve; 64: Fourth water outlet valve; 65: First hot water valve; 66: Second hot water valve; 67: Third hot water valve; 68: Fourth hot water valve; 71: First water inlet valve; 72: Second water inlet valve; 73: Third water inlet valve; 74: Fourth water inlet valve; 75: First cold water valve; 76: Second cold water valve; 77: Third cold water valve; 78: Fourth cold water valve; 80: Constant pressure pipe. Detailed implementation manners

[0027] To make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings.

[0028] In order to enable those of ordinary skill in the art to better understand the technical solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] It should be noted that the terms "first", "second", etc. in the description, claims and the above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0030] It should also be noted that the division of multiple embodiments in the present invention is only for convenience of description and should not constitute a special limitation. The features in various embodiments can be combined and cross-referenced without conflict.

[0031] An embodiment of the present invention provides a pressure stabilizing device for a water storage and heat release system, as Figure 1 shown. The pressure stabilizing device includes a pressure stabilizing container 11, a boosting unit 12 and an output unit 13. The pressure stabilizing container 11, the boosting unit 12 and the output unit 13 constitute a pressure stabilizing part 10. Among them, the pressure stabilizing container 11 is used to store the pressure maintaining gas. The input end 12a of the boosting unit 12 is connected to the pressure stabilizing container 11, and the output end 12b of the boosting unit 12 is used to connect to a heat storage medium storage unit 20 for a water storage and heat release system. The boosting unit 12 is used to boost the pressure maintaining gas stored in the pressure stabilizing container 11 and transport it to the heat storage medium storage unit 20 when the pressure in the heat storage medium storage unit 20 is lower than a first preset pressure. The output end 13b of the output unit 13 is connected to the pressure stabilizing container 11, and the input end 13a of the output unit 13 is used to connect to the heat storage medium storage unit 20. The output unit 13 is used to receive the pressure maintaining gas output from the heat storage medium storage unit 20 and transport it to the pressure stabilizing container 11 for storage when the pressure in the heat storage medium storage unit 20 is higher than the first preset pressure. Figure 1 The arrow direction in [the figure] indicates the flow direction of the pressure maintaining gas in the corresponding pipeline.

[0032] When the heat storage medium is pressurized water, the pressure maintaining gas is a gas that does not react with water, such as an inert gas like nitrogen, or it can also be compressed air. The pressure maintaining gas is used to maintain the pressure of the heat storage medium storage unit 20 within a preset range. When the pressure of the heat storage medium storage unit 20 is lower than the preset range, the pressure maintaining gas can be filled into the heat storage medium storage unit 20 to increase the pressure inside the heat storage medium storage unit 20 to the preset range. When the pressure of the heat storage medium storage unit 20 is higher than the preset range, the pressure maintaining gas inside the heat storage medium storage unit 20 can be discharged to decrease the pressure inside the heat exchange medium storage unit 20 to the preset range. The heat storage medium storage unit 20 is a structure in the water heat storage and release system for storing the heat storage medium, and is used to provide a storage space for the heat storage medium during the heat storage stage and the heat release stage of the water heat storage and release system. When the heat storage medium is pressurized water, the heat storage medium storage unit 20 is also used to store the pressure maintaining gas. By filling water and the pressure maintaining gas into the storage space of the heat storage medium storage unit 20 before the operation of the water heat storage and release system, the lower part of the storage space is the liquid phase space, and the upper part is the gas phase space. The pressure of the heat storage medium storage unit 20 can be adjusted according to the pressure of the filled pressure maintaining gas. For example, the heat storage medium storage unit 20 can include a cold storage unit for storing low-temperature heat storage medium and a heat storage unit for storing high-temperature heat storage medium. Of course, this embodiment is not limited to the above example. Among them, during the heat storage stage of the water heat storage and release system, the low-temperature heat storage medium is heated to become a high-temperature heat storage medium to store energy in the form of heat. During the heat release stage of the water heat storage and release system, the high-temperature heat storage medium is cooled to become a low-temperature heat storage medium to release the stored heat energy. During the heat storage stage and the heat release stage, the change in the temperature of water causes a change in the water level, which in turn causes a change in the pressure of the pressure maintaining gas, resulting in a change in the pressure of the heat storage medium storage unit 20. For example, during the heat storage stage, the low-temperature water is heated to become high-temperature water. Due to the thermal expansion and contraction of water, the volume of water increases, causing the pressure maintaining gas to be compressed and pressurized, and the pressure maintaining gas to be heated and pressurized by the high-temperature water, resulting in an increase in the pressure of the heat storage medium storage unit 20. During the heat release stage, the high-temperature water is cooled to become low-temperature water, and the decrease in the volume of water causes the pressure maintaining gas to expand and depressurize, and the pressure maintaining gas to be cooled and depressurized by the low-temperature water, resulting in a decrease in the pressure of the heat storage medium storage unit 20. Especially in the water heat storage and release system using pressurized water as the heat storage medium, it is necessary to take pressure maintaining measures for the heat storage medium storage unit 20 to maintain the stable state of the pressurized water (such as preventing the vaporization of water above 100 degrees Celsius), stable pressure, and stable pressure of the heat storage medium storage unit 20.

[0033] Among them, the suitable operating pressure of the heat storage medium storage unit 20 can be any value in the range of 0.1 - 5 MPa, such as 0.1 Mpa, 1 Mpa, 2 Mpa, 3 Mpa, 3.5 Mpa, 4 Mpa, 4.5 Mpa, 5 Mpa. The first preset pressure can be, for example, 3 MPa. Of course, in some embodiments, the first preset pressure can also be set as a numerical range. When the pressure of the heat storage medium storage unit 20 is lower than the minimum value of this numerical range, it is lower than the first preset pressure. When the pressure of the heat storage medium storage unit 20 is higher than the maximum value of this numerical range, it is higher than the first preset pressure. The pressure range of the pressure-holding gas stored in the pressure stabilizing container 11 is 0.5 - 32 Mpa. Exemplary values are 0.5 Mpa, 1 Mpa, 5 Mpa, 10 Mpa, 15 Mpa, 20 Mpa, 25 Mpa, 30 Mpa, 32 Mpa. When the pressure of the heat storage medium storage unit 20 drops and drops below 3 MPa, the pressure-holding gas after boosting is supplemented through the boosting unit 12. The pressure in the pressure stabilizing container 11 gradually drops, and the pressure of the heat storage medium storage unit 20 gradually rises to 3 Mpa. When the pressure of the heat storage medium storage unit 20 reaches 3 Mpa, the supplementation of the pressure-holding gas stops. When the pressure of the heat storage medium storage unit 20 rises and rises above 3 Mpa, the pressure-holding gas output from the heat storage medium storage unit 20 can be received through the output unit 13 and stored in the pressure stabilizing container 11. The pressure in the pressure stabilizing container 11 gradually rises, and the pressure in the heat storage medium storage unit 20 gradually drops to 3 MPa. When it reaches 3 MPa, the storage of the pressure-holding gas in the pressure stabilizing container 11 can stop.

[0034] Through the above solution, the pressure stabilizing container 11 can store the pressure-holding gas, and can realize the closed-loop connection between the pressure stabilizing container 11 and the heat storage medium storage unit 20 through the boosting unit 12 and the output unit 13 during the heat storage and heat release processes, so that the pressure-holding gas can circulate between the pressure stabilizing container 11 and the heat storage medium storage unit 20 during the heat storage and heat release cycles, so as to maintain the pressure stability of the heat storage medium storage unit 20 during the heat storage and heat release processes and balance the pressure changes caused by thermal expansion and contraction during the heat storage and heat release processes. Moreover, since a loop is formed between the pressure stabilizing container 11 and the heat storage medium storage unit 20, the pressure-holding gas does not need to be discharged to the external environment during the pressure stabilizing process, and there is no need to supplement the pressure-holding gas from the outside, which can achieve efficient utilization of resources, reduce waste, and lower the operating cost.

[0035] Refer to Figure 2, in some embodiments, the pressurizing unit 12 includes a pressurizing pipeline 126 and a pressurizing pump 121. The opposite ends of the pressurizing pipeline 126 are respectively the input end 12a and the output end 12b of the pressurizing unit 12. The pressurizing pump 121 is disposed on the pressurizing pipeline 126, and the inlet end of the pressurizing pump 121 is connected to the pressure stabilizing container 11. In this embodiment, the pressurizing pump 121 can achieve the function of pressurizing the pressurized gas in the pressure stabilizing container 11. Figure 2 The arrow direction in [figure] indicates the flow direction of the pressurized gas in the corresponding pipeline.

[0036] Referring to Figure 3 , in some embodiments, the pressurizing unit 12 further includes a first cooling member 125 disposed on the pressurizing pipeline 126. The first cooling member 125 is located between the outlet end of the pressurizing pump 121 and the output end 12b of the pressurizing unit 12. The first cooling member 125 is used to cool the pressurized gas output from the pressurizing pump 121. When the pressure in the heat storage medium storage unit 20 is lower than the first preset pressure, the pressurizing pump 121 pressurizes the pressurized gas in the pressure stabilizing container 11. During the pressurizing process, the temperature of the pressurized gas rises. In this embodiment, by setting the first cooling member 125, the pressurized gas is cooled to a temperature range that meets the operating requirements of the heat storage medium storage unit 20 to ensure stable operation. The first cooling member 125 can be a radiator. Figure 3 The arrow direction in [figure] indicates the flow direction of the pressurized gas in the corresponding pipeline.

[0037] Referring to Figure 3 , in some embodiments, the output unit 13 includes an output pipeline 134. The opposite ends of the output pipeline 134 are respectively the input end 13a and the output end 13b of the output unit 13. A second cooling member 133 is disposed on the output pipeline 134. The second cooling member 133 is used to cool the pressurized gas output from the heat storage medium storage unit 20. During the heat storage process, the output unit 13 receives the pressurized gas into the pressure stabilizing container 11 for storage to maintain the pressure stability of the heat storage medium storage unit 20. Since the pressurized gas in the heat storage medium storage unit 20 enters the pressure stabilizing container 11 from the conveying unit during the process of maintaining the pressure stability of the heat storage medium storage unit 20, the pressure in the pressure stabilizing container 11 will gradually increase. After cooling the pressurized gas by the second cooling member 133 and then conveying it into the pressure stabilizing container 11, the pressure in the pressure stabilizing container 11 can be prevented from rising too fast to ensure safe operation. And the lower temperature of the pressurized gas enables the pressure stabilizing container 11 to store more pressurized gas, improving the processing capacity of the pressure stabilizing device. The second cooling member 133 can be set as a radiator with reference to the first cooling member 125.

[0038] Referring to Figure 4, in some other embodiments, the output unit 13 may share the first cooling member 125 with the pressurizing unit 12, and the first cooling member 125 is also used to cool the pressure-holding gas output from the heat storage medium storage unit 20. Specifically, as Figure 4 shown, the output pipeline 134 shares the first pipe section 1261 of the pressurizing pipeline 126, and the first cooling member 125 is arranged on the first pipe section 1261. Figure 4 In, the part between the first pipe end 1261a and the second pipe end 1261b is the first pipe section 1261. When the pressurizing unit 12 outputs the pressurized pressure-holding gas to the heat storage medium storage unit 20, the pressure-holding gas output from the pressurizing pump 121 enters the first pipe section 126 through the first pipe end 1261a, is cooled by the first cooling member 125, and then is output from the second pipe section 1261b, and finally is output to the heat storage medium storage unit 20 through the output end 12b of the pressurizing unit 12. When receiving the pressure-holding gas through the output unit 13 and storing it in the pressure stabilizing container 11, the pressure-holding gas received by the input end 13a of the output unit 13 enters the first pipe section 126 through the second pipe end 1261b, is cooled by the first cooling member 125, and then is output from the first pipe end 1261a to the output pipeline 134, and finally is transported into the pressure stabilizing container 11 through the output end 13b of the output unit 13. If the heat storage and heat release are not in the same time period, the output unit 13 and the pressurizing unit 12 can independently transfer the pressure-holding gas. Therefore, in the heat storage and heat release stages, the first cooling member 125 can be shared to cool the input pressure-holding gas, reducing the operation cost and the project investment cost. Figure 4 In, the arrow direction indicates the flow direction of the pressure-holding gas in the corresponding pipeline.

[0039] Referring to Figure 5 , in some embodiments, the output unit 13 includes a pressure stabilizing valve 131, and the pressure stabilizing valve 131 is specifically arranged on the output pipeline 134. The pressure stabilizing valve 131 is used to maintain the pressure of the pressure-holding gas output from the output end of the output unit 13 stable at a second preset pressure. The pressure stabilizing valve 131 can also be called a pressure reducing valve, which is a valve that can automatically keep the outlet pressure stable relying on the energy of the medium itself. Specifically, when the output unit 13 includes a second cooling member 133, the pressure stabilizing valve 131 is specifically arranged between the second cooling member 133 and the pressure stabilizing container 11. Or when the output unit 13 shares the first cooling member 125 with the pressurizing unit 12, the pressure stabilizing valve 131 is arranged between the first cooling member 125 and the pressure stabilizing container 11, that is, the pressure stabilizing valve 131 is arranged between the first pipe end 1261a and the pressure stabilizing container 11. By setting the pressure stabilizing valve 121, the pressure of the pressure-holding gas entering the pressure stabilizing container 11 can be maintained, ensuring the stable operation of the pressure stabilizing container 11.

[0040] In some embodiments, such as Figure 5As shown, a balance valve 132 is further provided on the output unit 13. The balance valve 132 is used to automatically open when the pressure of the heat storage medium storage unit 20 is greater than the first preset pressure so that the output unit 13 receives the pressure maintaining gas output by the heat storage medium storage unit 20, and to close when the pressure of the heat storage medium storage unit 20 is less than or equal to the first preset pressure to isolate the output unit 13 and the heat storage medium storage unit. The balance valve 132 is, for example, provided on the output pipeline 134 and near the input end 13a of the output unit 13. Specifically, it is, for example, provided between the first cooling member 125 (or the second cooling member 133) and the input end 13a of the output unit 13. The first preset pressure is, for example, 3 Mpa. Then, when the pressure of the heat storage medium storage unit 20 is greater than 3 Mpa, the balance valve 132 opens, and the pressure maintaining gas in the heat storage medium storage unit 20 can be transported to the pressure stabilizing container 11 for storage through the output unit 13 to relieve the pressure rise of the heat storage medium storage unit 20 and ensure safe operation. When the pressure of the heat storage medium storage unit 20 is less than or equal to 3 Mpa, the balance valve 132 closes, and the output unit 13 is separated from the heat storage medium storage unit 20. The pressure maintaining gas will not flow from the heat storage medium storage unit 20 to the pressure stabilizing container 11. By providing the balance valve 132, automatic connection and blocking of the output unit 13 can be achieved to adapt to the pressure change of the heat storage medium storage unit 20.

[0041] In a specific embodiment, as Figure 5As shown, an isolation valve 122, a booster pump 121, a first air supply valve 123, and a second air supply valve 124 are specifically arranged in sequence on the booster pipeline 126 of the booster unit 12. A balance valve 132 and a pressure stabilizing valve 131 are arranged in sequence on the output pipeline 134 of the output unit 13. The booster unit 12 and the output unit 13 share a first cooling element 125. When the pressure in the heat storage medium storage unit 20 rises and exceeds the first preset pressure, the pressure maintaining gas in the heat storage medium storage unit 20 needs to be discharged to prevent safety problems caused by excessive pressure in the heat storage medium storage unit 20. At this time, the isolation valve 122, the first air supply valve 123, and the second air supply valve 124 are closed, the pressure stabilizing valve 131 is opened, and the balance valve 132 is opened. The pressure maintaining gas in the heat storage medium storage unit 20 enters the first cooling element 125 for cooling after passing through the balance valve 132. The cooled pressure maintaining gas enters the pressure stabilizing container 11 for storage through the pressure stabilizing valve 131. The pressure in the pressure stabilizing container 11 gradually rises, and the pressure in the heat storage medium storage unit 20 gradually decreases. When the pressure in the heat storage medium storage unit 20 drops to the first preset pressure or below, the balance valve 132 is closed. When the pressure in the heat storage medium storage unit 20 drops below the first preset pressure, the pressure stabilizing valve 131 is closed, and the isolation valve 122, the first air supply valve 123, the second air supply valve 124, and the booster pump 121 are opened. The pressure maintaining gas in the pressure stabilizing container 11 is increased and output by the booster pump 121, and the boosted pressure maintaining gas is cooled by the first cooling element 125 and then output to the heat storage medium storage unit 20. When the pressure in the heat storage medium storage unit 20 rises to the first preset pressure, the booster pump 121, the isolation valve 122, the first air supply valve 123, and the second air supply valve 124 are closed, and the air supply to the heat storage medium storage unit 20 is stopped. Through the above process, the pressure stability during the operation of the heat storage medium storage unit 20 can be maintained, and the problem of large pressure fluctuations caused by changes in water temperature and water level can be prevented.

[0042] In other embodiments, as Figure 6 shown, the pressure stabilizing device further includes a pressure detection unit and a control valve 14. The pressure detection unit is used to detect the pressure in the heat storage medium storage unit 20. The first end of the control valve 14 is used to connect to the heat storage medium storage unit 20. The pressure detection unit can adopt a pressure sensor, for example, and can convert the pressure change of the heat exchange medium storage unit 20 into an electrical signal for output. The control valve 14 adopts an electric valve, for example, and can be opened or closed by receiving the electrical signal of the pressure detection unit or the control instruction sent by the control unit based on the electrical signal of the pressure detection unit. Figure 6 The arrow direction in

[0043] In one embodiment, the second end of the control valve 14 is connected to the output end 12a of the pressurizing unit 12. The control valve 14 is configured to open when the pressure detection unit detects that the pressure in the heat storage medium storage unit 20 is lower than a first preset pressure, so as to conduct the pressurizing unit 12 and the heat storage medium storage unit 20. In this embodiment, the pressure detection unit and the control valve 14 are used to achieve the conduction between the pressurizing unit 12 and the heat exchange medium storage unit 20, which facilitates the realization of automatic control and meets the start-up requirements of different design pressures.

[0044] In some embodiments, the second end of the control valve 14 is connected to the input end 13a of the input unit 13. The control valve 14 is configured to open when the pressure detection unit detects that the pressure in the heat storage medium storage unit 20 is higher than a first preset pressure, so as to conduct the output unit 13 and the heat storage medium storage unit 20. In this embodiment, the pressure detection unit and the control valve 14 are used to achieve the conduction between the output unit 13 and the heat exchange medium storage unit 20, which facilitates the realization of automatic control and meets the start-up requirements of different design pressures. Moreover, compared with the solution of achieving conduction through the balance valve 132, when choosing the combination of the pressure detection unit and the control valve 14, the selection of a specific type of valve can be avoided, the difficulty of equipment selection can be reduced, and the model of the control valve 14 does not need to be replaced when changing the range of the first preset pressure, and the adaptability is better.

[0045] In some embodiments, the output end 12b of the pressurizing unit 12 and the input end 13a of the output unit 13 are commonly connected to the second end of the control valve 14. The first preset pressure is, for example, a pressure range. For example, the first preset pressure is, for example, 3 to 5 Mpa. Then, when the pressure is lower than 3 Mpa, it is lower than the first preset pressure, and when the pressure is higher than 5 Mpa, it is higher than the first preset pressure. When the pressure is between 3 and 5 Mpa (for example, 4 MPa), the pressure conforms to the first preset pressure. When the pressure detection unit detects that the pressure in the heat storage medium storage unit 20 is lower than the first preset pressure, the control valve 14 opens to connect the pressurizing unit 12 to supplement the pressure-maintaining gas. When the pressure detection unit detects that the pressure in the heat storage medium storage unit 20 is higher than the first preset pressure, the control valve 14 opens to connect the output unit 13 to discharge the pressure-maintaining gas. When the pressure detection unit detects that the pressure in the heat storage medium storage unit 20 conforms to the first preset pressure, the control valve 14 is closed to isolate the voltage stabilizing part 10 from the heat storage medium storage unit 20.

[0046] In Figure 6In the specific embodiments shown, for example, when the pressure in the heat storage medium storage unit 20 conforms to the first preset pressure, the control valve 14 is closed, and the pressure stabilizing unit 10 does not receive or supplement the pressure maintaining gas. When the pressure in the heat storage medium storage unit 20 is lower than the first preset pressure, the control valve 14 is opened, the pressure stabilizing valve 131 is closed, the isolation valve 122 and the first air supplement valve 123 are both opened, and the booster pump 121 operates to boost the pressure maintaining gas in the pressure stabilizing container 11 and output it to the heat storage medium storage unit 20 after cooling by the first cooling element 125. When the pressure in the heat storage medium storage unit 20 is higher than the first preset pressure, the control valve 141 is opened, the pressure stabilizing valve 131 is opened, the isolation valve 122 and the first air supplement valve 123 are closed, and the heat storage medium storage unit 20 discharges the pressure maintaining gas to the pressure stabilizing container 11. Therefore, in this embodiment, by setting the pressure detection unit and the control valve 14, and connecting the booster unit 12 and the output unit 13 to the control valve 14, the on-off of the two paths of boosting and output can be realized through the control valve 14, and the equipment cost can be reduced.

[0047] In the embodiments of the present invention, the pressure stabilizing device for the water heat storage and release system further includes a heat storage medium storage unit 20. As Figure 1 shown, the output end 12b of the booster unit 12 is connected to the heat storage medium storage unit 20, and the input end 13a of the output unit 13 is connected to the heat storage medium storage unit 20. The heat storage medium storage unit 20 is used to store the heat storage medium and the pressure maintaining gas.

[0048] Specifically referring to Figure 7 , the heat storage medium storage unit 20 specifically includes a plurality of storage tanks, and the plurality of storage tanks at least include a constant pressure hot tank 21a, a constant pressure cold tank 21c, and a transfer tank 21b. The constant pressure hot tank 21a is used to store high-temperature water and the pressure maintaining gas. The constant pressure cold tank 21c is used to store low-temperature water and the pressure maintaining gas.

[0049] After the heat release stage ends and before the heat storage stage starts, the constant pressure hot tank 21a is used to store the pressure maintaining gas, the constant pressure cold tank 21c and the transfer tank 21b are used to store low-temperature water, and the tops of the constant pressure cold tank 21c and the transfer tank 21b are used to store the pressure maintaining gas.

[0050] After the heat storage stage ends and before the heat release stage starts, the constant pressure hot tank 21a and the transfer tank 21b are used to store high-temperature water, and the tops of the constant pressure hot tank 21a and the transfer tank 21b are used to store the pressure maintaining gas. The constant pressure cold tank 21c is used to store the pressure maintaining gas.

[0051] It can be understood that for any one of the multiple storage tanks, when low-temperature water or high-temperature water is stored in the tank, the lower part is the liquid-phase space for storing water, and the upper part is the gas-phase space for storing pressure-maintaining gas. The pressure-maintaining gas accounts for about 75% of the tank volume. During the heat storage stage, the inverted tank 21b storing low-temperature water and the constant-pressure cold tank 21c storing low-temperature water are used to output low-temperature water to be heated and stored as high-temperature water, storing heat in the high-temperature water to achieve heat storage. The constant-pressure hot tank 21a is used to receive and store the high-temperature water heated through heat storage. During the heat release stage, the inverted tank 21b storing high-temperature water and the constant-pressure hot tank 21a storing high-temperature water are used to output high-temperature water to be cooled and released as low-temperature water, releasing the heat in the high-temperature water to achieve the heat release effect. The constant-pressure cold tank 21c is used to receive and store the low-temperature water cooled through heat release. Among them, the relative relationship between the low-temperature water and the high-temperature water means that the temperature of the low-temperature water is lower than that of the high-temperature water. The temperature of the low-temperature water is, for example, 30 to 40 °C. The temperature of the high-temperature water is, for example, 150 to 220 °C. The selection of the water temperature can be based on the temperature corresponding to the saturated vapor pressure.

[0052] Compared with the traditional water storage structure where the cold storage tank only stores low-temperature water and the heat storage tank only stores high-temperature water, in this embodiment, the inverted tank 21b can store both high-temperature water and low-temperature water, enabling the reuse of the inverted tank 21b in different stages, so that fewer storage tanks can be set, reducing the equipment cost.

[0053] Among them, the number of inverted tanks 21b is one or more.

[0054] In some embodiments, the number of inverted tanks 21b is one. During the heat storage stage, the inverted tank 21b is used to output low-temperature water to be heated and stored as high-temperature water and then transported to the constant-pressure hot tank 21a. The constant-pressure hot tank 21a is used to receive the high-temperature water output from the inverted tank 21b and heated. After the inverted tank 21b finishes outputting low-temperature water, the constant-pressure cold tank 21c is used to output low-temperature water to be heated and stored as high-temperature water and then transported to the inverted tank 21b.

[0055] During the exothermic stage, the inverted tank 21b is used to output high-temperature water, which is cooled by heat release to low-temperature water and then transported to the constant-pressure cold tank 21c. The constant-pressure cold tank 21c is used to receive the low-temperature water cooled after being output from the inverted tank 21b. After the inverted tank 21b finishes outputting high-temperature water, the constant-pressure hot tank 21a is used to output high-temperature water, which is cooled by heat release and then output to the inverted tank 21b. That is, during the heat storage stage, the inverted tank 21b first functions as a cold storage tank to store low-temperature water. When the output of the low-temperature water in the inverted tank 21b is completed, only the pressure-holding gas is stored in the inverted tank 21b, which can be used to receive high-temperature water to realize the function of a heat storage tank. During the exothermic stage, the inverted tank 21b first functions as a heat storage tank to store high-temperature water. When the output of the high-temperature water in the inverted tank 21b is completed, only the pressure-holding gas is stored in the inverted tank 21b, which can be used to receive low-temperature water to realize the function of a cold storage tank. Therefore, not only can the number of storage tanks be saved, but also the mixing of low-temperature water and high-temperature water can be prevented by receiving low-temperature water after the inverted tank 21b finishes outputting high-temperature water, or receiving high-temperature water after the inverted tank 21b finishes outputting low-temperature water, thereby improving the heat storage efficiency.

[0056] In this embodiment, a liquid level detection unit can be respectively set corresponding to multiple storage tanks, and the operation of each storage tank can be controlled according to the liquid level conditions in the multiple storage tanks.

[0057] In some embodiments, the number of inverted tanks 21b is more than one. During the heat storage stage, one of the more than one inverted tanks 21b outputs low-temperature water, which is heated to high-temperature water through heat storage and then transported to the constant-pressure hot tank or another inverted tank 21b. After one inverted tank 21b finishes outputting low-temperature water, it becomes an empty inverted tank. Another inverted tank among the more than one inverted tanks 21b or the constant-pressure cold tank 21c outputs low-temperature water, which is heated to high-temperature water through heat storage and then transported to the empty inverted tank. During the exothermic stage, one of the more than one inverted tanks 21b outputs high-temperature water, which is cooled by heat release and then transported to the constant-pressure cold tank 21c or another inverted tank 21b. After one inverted tank 21b finishes outputting high-temperature water, it becomes an empty inverted tank. Another inverted tank 21b among the more than one inverted tanks 21b or the constant-pressure hot tank 21a outputs high-temperature water, which is cooled by heat release to low-temperature water and then transported to the empty inverted tank.

[0058] It can be referred to Figure 8, multiple storage tanks include a first tank 211, a second tank 212, a third tank 213, and a fourth tank 214. Taking the first tank 211 as the constant-pressure cold tank 21c, the second tank 212 and the third tank 213 as the transfer tanks 21b, and the fourth tank 214 as the constant-pressure hot tank 21a as an example. Before the heat storage stage begins, a pressurized gas is stored in the fourth tank 214, and low-temperature water and a pressurized gas are stored in the first tank 211, the second tank 212, and the third tank 213. During the heat storage stage, the third tank 213 outputs low-temperature water, which is heated to high-temperature water for heat storage and then transported to the fourth tank 214 (constant-pressure hot tank 21a). After the third tank finishes outputting high-temperature water, it becomes an empty transfer tank. The second tank 212 outputs low-temperature water, which is heated to high-temperature water for heat storage and then transported to the third tank 213 (empty transfer tank). After the second tank 212 finishes outputting low-temperature water, it becomes an empty transfer tank. The first tank 211 (constant-pressure cold tank 21c) outputs low-temperature water, which is heated to high-temperature water for heat storage and then transported to the second tank 212 (empty transfer tank). After heat storage is completed (and before the heat release stage), a pressurized gas is stored in the first tank 211, and high-temperature water and a pressurized gas are stored in the second tank 212, the third tank 213, and the fourth tank 214.

[0059] During the heat release stage, the second tank 212 outputs high-temperature water, which is cooled to low-temperature water for heat release and then transported to the first tank 211 (constant-pressure cold tank 21c). After the second tank 212 finishes outputting high-temperature water, it becomes an empty transfer tank. The third tank 213 outputs high-temperature water, which is cooled to low-temperature water for heat release and then transported to the second tank 212 (empty transfer tank). After the third tank 213 finishes outputting high-temperature water, it becomes an empty transfer tank. The fourth tank 214 (constant-pressure hot tank 21a) outputs high-temperature water, which is cooled to low-temperature water for heat release and then transported to the third tank (empty transfer tank). After heat release is completed, a pressurized gas is stored in the fourth tank 214, and low-temperature water and a pressurized gas are stored in the first tank 211, the second tank 212, and the third tank 213.

[0060] That is, during the heat storage process, any inverted tank 21b storing low-temperature water will output low-temperature water to the constant-pressure heat tank 21a or become another inverted tank 21b that is emptied. Any inverted tank 21b that becomes an emptied inverted tank will receive and store high-temperature water. Therefore, during the heat storage process, each inverted tank 21 among the multiple inverted tanks 21 undergoes the process of "outputting low-temperature water → completing the output of low-temperature water and becoming an emptied inverted tank → receiving high-temperature water", achieving the effect of serving as both a cold storage tank and a heat storage tank. During the heat release process, any inverted tank 21b storing high-temperature water will output high-temperature water to the constant-pressure cold tank 21c or become another inverted tank 21b that is emptied. Any inverted tank 21b that becomes an emptied inverted tank will receive and store low-temperature water. Therefore, during the heat release process, each inverted tank 21 among the multiple inverted tanks 21 undergoes the process of "outputting high-temperature water → completing the output of high-temperature water and becoming an emptied inverted tank → receiving low-temperature water", achieving the effect of serving as both a cold storage tank and a heat storage tank. Therefore, by using more than one inverted tank 21b, not only can the number of storage tanks be saved, but also the mixing of low-temperature water and high-temperature water can be prevented by receiving low-temperature water after the inverted tank 21b completes the output of high-temperature water, or receiving high-temperature water after completing the output of low-temperature water, thereby improving the heat storage efficiency.

[0061] In some embodiments, referring to Figure 7 , the pressure stabilizing device further includes a constant-pressure pipe 80. The input end 13a of the output unit 13 and the output end 12b of the pressurizing unit 12 are respectively connected to the constant-pressure pipe 80. The top of each of the multiple storage tanks is respectively communicated with the constant-pressure pipe 80. The constant-pressure pipe 80 is used to conduct the gas phase spaces at the tops of the multiple storage tanks to balance the pressures in the multiple storage tanks. No valves are provided or the valves are normally open on the pipelines connecting the multiple storage tanks and the constant-pressure pipe 80, so as to keep the tops of the multiple storage tanks communicated through the constant-pressure pipe 80. During the heat storage stage and the heat release stage, the pressure maintaining gas can flow between the multiple storage tanks through the constant-pressure pipe 80 to balance the pressures between the multiple storage tanks. During the heat storage stage, the water level of the storage tank outputting low-temperature water drops, and the water level of the storage tank inputting high-temperature water rises and the temperature increases. Therefore, the pressure maintaining gas at the top of the storage tank inputting high-temperature water can flow through the constant-pressure pipe 80 to the storage tank outputting low-temperature water. During the heat release stage, the water level of the storage tank outputting high-temperature water drops, the temperature drops, and the water level of the storage tank outputting low-temperature water rises. Therefore, the pressure maintaining gas at the top of the storage tank inputting low-temperature water can flow through the constant-pressure pipe into the storage tank outputting high-temperature water. Therefore, through the above setting of the constant-pressure pipe 80, the pressure fluctuations caused by the liquid level changes and thermal expansion and contraction in the storage tank during the heat storage stage or the heat release stage can be balanced, the normal operating pressure of each storage tank can be maintained, and during the heat storage stage or the heat release stage, the pressure balance can be first achieved through the interaction of the pressure maintaining gas between the multiple storage tanks, and then the pressure stabilizing part 10 of the pressure stabilizing device can supplement or discharge the pressure maintaining gas to maintain the pressure stability, ensuring the heat storage and heat release efficiency.

[0062] In some embodiments, the volumes of multiple storage tanks are equal, which is convenient for alternating use of each storage tank one by one. There is no mixing phenomenon of cold water and hot water in each storage tank, and the energy storage efficiency is higher. Moreover, it can ensure constant pressure use during the heat storage stage and the heat release stage.

[0063] In some embodiments, referring to Figure 8 , the embodiment of the present invention further provides a water heat storage and release system, which includes the pressure stabilizing device of the foregoing embodiment. The water heat storage and release system further includes an inlet pipeline 51 and an outlet pipeline 52. The inlet pipeline 51 includes an inlet main pipe 511 and a plurality of inlet branch pipes 512 that are respectively and correspondingly connected to multiple storage tanks. The plurality of inlet branch pipes 512 are respectively connected to the inlet main pipe 511. The outlet pipeline 52 includes an outlet main pipe 521 and a plurality of outlet branch pipes 522 that are respectively and correspondingly connected to multiple storage tanks. The plurality of outlet branch pipes 522 are respectively connected to the outlet main pipe 521. The water heat storage and release system further includes an energy storage heat exchanger 31. The outlet main pipe 521 is used to be connected to the inlet end of the energy storage heat exchanger 31, and the inlet main pipe 511 is used to be connected to the outlet end of the energy storage heat exchanger 31. The inverted tank 21b and the constant pressure cold tank 21c are used to output low-temperature water to the outlet main pipe 521 through their respective corresponding outlet branch pipes 522 during the heat storage stage and heat up into high-temperature water via the energy storage heat exchanger 31. The constant pressure hot tank 21a and the inverted tank 21b are used to receive the high-temperature water output from the energy storage heat exchanger 31 to the inlet main pipe 511 through their respective corresponding inlet branch pipes 512 during the heat storage stage.

[0064] The water heat storage and release system further includes an energy release heat exchanger 41. The outlet main pipe 521 is used to be connected to the inlet end of the energy release heat exchanger 41, and the inlet main pipe 511 is used to be connected to the outlet end of the energy release heat exchanger 41. The inverted tank 21b and the constant pressure hot tank 21a are used to output high-temperature water to the outlet main pipe 521 through their respective corresponding outlet branch pipes 522 during the heat release stage and release heat and cool down into low-temperature water via the energy release heat exchanger 41. The constant pressure cold tank 21c and the inverted tank 21b are used to receive the low-temperature water output from the energy release heat exchanger 41 to the inlet main pipe 511 through their respective corresponding inlet branch pipes 512 during the heat release stage.

[0065] Referring to Figure 8For example, there are multiple storage tanks including a first tank 211, a second tank 212, a third tank 213, and a fourth tank. The water inlet branch pipe 512 corresponding to the first tank 211 is connected or isolated from the water inlet main pipe 511 through a first water inlet valve 71. The water inlet branch pipe 512 corresponding to the second tank 212 is connected or isolated from the water inlet main pipe 511 through a second water inlet valve 72. The water inlet branch pipe 512 corresponding to the third tank 213 is connected or isolated from the water inlet main pipe 511 through a third water inlet valve 73. The water inlet branch pipe 512 corresponding to the fourth tank 214 is connected or isolated from the water inlet main pipe 511 through a fourth water inlet valve 74. The water outlet branch pipe 522 corresponding to the first tank 211 is connected or isolated from the water outlet main pipe 521 through a first water outlet valve 61. The water outlet branch pipe 522 corresponding to the second tank 212 is connected or isolated from the water outlet main pipe 521 through a second water outlet valve 62. The water outlet branch pipe 522 corresponding to the third tank 313 is connected or isolated from the water outlet main pipe 521 through a third water outlet valve 63. The water outlet branch pipe 522 corresponding to the fourth tank 314 is connected or isolated from the water outlet main pipe 521 through a fourth water outlet valve 64.

[0066] For example, the fourth tank 214 serves as a constant-pressure cold tank 21c and stores a pressure-maintaining gas before the heat storage stage. The first tank 211 serves as a constant-pressure hot tank 21a, and the second tank 212 and the third tank 213 serve as transfer tanks 21b. The first tank 211, the second tank 212, and the third tank 213 store low-temperature water (30 - 40 °C) and a pressure-maintaining gas before the heat storage stage. First, for example, the fourth water inlet valve 74 and the third water outlet valve 63 are opened, and the rest of the valves are closed. The energy storage pump 33 transports the low-temperature water stored in the third tank 213 through the water outlet branch pipe 522 where the third water outlet valve 63 is located and the water outlet main pipe 521 to the energy storage heat exchanger 31 for heat exchange and temperature rise. After the temperature rise, the water temperature reaches, for example, 150 - 220 degrees Celsius and becomes high-temperature water. The high-temperature water enters the fourth tank 214 through the water inlet main pipe 511 and the water inlet branch pipe 512 where the fourth water inlet valve 74 is located. That is, after all the water in the third tank 213 completely enters the fourth tank 214, the third tank 213 becomes an empty transfer tank, and the fourth tank 214 stores high-temperature water. Then, the fourth water inlet valve 74 and the third water outlet valve 63 are closed, and the third water inlet valve 73 and the second water outlet valve 62 are opened (the rest of the valves remain unchanged). The energy storage pump 33 transports the low-temperature water stored in the second tank 212 through the water outlet branch pipe 522 where the second water outlet valve 62 is located and the water outlet main pipe 521 to the energy storage heat exchanger 31 for temperature rise. The heated water enters the third tank 213 through the water inlet main pipe 511 and the water inlet branch pipe 512 where the third water inlet valve 73 is located. When all the water in the second tank 212 completely enters the third tank 213, the second tank 212 becomes an empty transfer tank, and the third tank 213 stores high-temperature water. By analogy, after the heat storage stage is completed, the first tank 211 stores a pressure-maintaining gas, and the second tank 212, the third tank 213, and the fourth tank 214 store the heated (high-temperature water) water and a pressure-maintaining gas.

[0067] During the exothermic stage, first open the first water inlet valve 71 and the second water outlet valve 62, and keep the other valves closed. The energy release pump 43 transports the high-temperature water in the second tank 212 to the energy release heat exchanger 41 for cooling through the water outlet branch pipe 522 where the second water outlet valve 62 is located and the water outlet main pipeline 521. The cooled water enters the first tank 211 through the water inlet main pipeline 511 and the water inlet branch pipe 511 where the first water inlet valve 71 is located. When the water in the second tank 212 is completely input into the first tank 211, the second tank 212 becomes an empty inverted tank, and the first tank 211 stores low-temperature water. Then, close the first water inlet valve 71 and the second water outlet valve 62, open the second water inlet valve 72 and the third water outlet valve 63 (keep the other valves unchanged). The energy release pump 43 transports the high-temperature water in the third tank 213 to the energy release heat exchanger 41 for cooling through the water outlet branch pipe 522 where the third water outlet valve 63 is located and the water outlet main pipeline 521. The cooled water is transported to the second tank 212 through the water inlet main pipeline 511 and the water inlet branch pipe 512 where the second water inlet valve 72 is located. When the high-temperature water in the third tank 213 completely enters the second tank 212, the third tank 213 becomes an empty inverted tank, and the second tank 212 stores cold water. Proceed in sequence. After the exothermic stage is completed, the fourth tank 214 stores the pressurized gas, and the first tank 211, the second tank 212, and the third tank 213 store the cooled water (low-temperature water). Of course, the above-mentioned usage switching sequence of each storage tank is only for illustrative purposes, and the specific switching sequence is not limited in this embodiment.

[0068] That is, through the above arrangement where each storage tank is respectively connected to the water inlet main pipeline 511 through the corresponding water inlet branch pipe 512, the corresponding water outlet branch pipe 522 of each storage tank is connected to the water outlet main pipeline 521, the energy storage heat exchanger 31 is respectively connected to the water inlet main pipeline 511 and the water outlet main pipeline 521, and the energy release heat exchanger 41 is connected to the water inlet main pipeline 511 and the water outlet main pipeline 521, the inverted tanks 21b in multiple storage tanks can be alternately used as cold storage tanks or heat storage tanks. Compared with the structure where cold storage tanks and heat storage tanks are separately arranged, the number of storage tanks can be reduced in this embodiment, and the investment cost can be lowered. In addition, the water inlet main pipeline 511 can be shared for water inlet and the water outlet main pipeline 521 can be shared for water outlet during the energy storage stage and the energy release stage, which can reduce the pipeline layout and lower the construction cost.

[0069] Refer to Figure 9, in the water storage and heat release system provided in another embodiment, it further includes a hot water pipeline 53 and a cold water pipeline 54. The hot water pipeline 53 includes a hot water main pipe 531 and a plurality of hot water branch pipes 532 that are respectively and correspondingly connected to a plurality of storage tanks. The plurality of hot water branch pipes 532 are respectively connected to the hot water main pipe 531. The cold water pipeline 54 includes a cold water main pipe 541 and a plurality of cold water branch pipes 542 that are respectively and correspondingly connected to a plurality of storage tanks. The plurality of cold water branch pipes 542 are respectively connected to the cold water main pipe 541. The water storage and heat release system further includes a heat storage heat exchanger 31. The cold water main pipe 541 is connected to the inlet end of the heat storage heat exchanger 31, and the hot water main pipe 541 is connected to the outlet end of the heat storage heat exchanger 31. The inverted tank 21b and the constant-pressure cold tank 21c are used to output low-temperature water through their respective corresponding cold water branch pipes 542 during the heat storage stage and transport it to the heat storage heat exchanger 31 through the cold water main pipe 541 to be heated into high-temperature water. The constant-pressure hot tank 21a and the inverted tank 21b are used to receive the high-temperature water output from the heat storage heat exchanger 31 to the hot water main pipe 531 through their respective corresponding hot water branch pipes 532 during the heat storage stage.

[0070] The water storage and heat release system further includes an energy release heat exchanger. The cold water main pipe 541 is connected to the outlet end of the energy release heat exchanger 41, and the hot water main pipe 531 is connected to the inlet end of the energy release heat exchanger 31. The inverted tank 21b and the constant-pressure hot tank 21a are used to output high-temperature water through their respective corresponding hot water branch pipes 532 during the heat release stage and transport it to the energy release heat exchanger 41 through the hot water main pipe 531 to be cooled into low-temperature water. The constant-pressure cold tank 21c and the inverted tank 21b are used to receive the low-temperature water output from the energy release heat exchanger 41 to the cold water main pipe 541 through their respective corresponding cold water branch pipes 542 during the heat release stage.

[0071] Referring to Figure 9 For example, the plurality of storage tanks include a first tank 211, a second tank 212, a third tank 213, and a fourth tank. The cold water branch pipe 542 corresponding to the first tank 211 is conducted or isolated from the cold water main pipe 541 through a first cold water valve 75. The cold water branch pipe 542 corresponding to the second tank 212 is conducted or isolated from the cold water main pipe 541 through a second cold water valve 76. The cold water branch pipe 542 corresponding to the third tank 213 is conducted or isolated from the cold water main pipe 541 through a third cold water valve 77. The cold water branch pipe 542 corresponding to the fourth tank 214 is conducted or isolated from the cold water main pipe 541 through a fourth cold water valve 78. The hot water branch pipe 532 corresponding to the first tank 211 is conducted or isolated from the hot water main pipe 531 through a first hot water valve 65. The hot water branch pipe 532 corresponding to the second tank 212 is conducted or isolated from the hot water main pipe 531 through a second hot water valve 66. The hot water branch pipe 532 corresponding to the third tank 313 is conducted or isolated from the hot water main pipe 531 through a third hot water valve 67. The hot water branch pipe 532 corresponding to the fourth tank 314 is conducted or isolated from the hot water main pipe 531 through a fourth hot water valve 68.

[0072] For example, the fourth tank 214 serves as a constant-pressure cold tank 21c and stores a pressure-holding gas before the heat storage stage. The first tank 211 serves as a constant-pressure hot tank 21a, and the second tank 212 and the third tank 213 serve as inverted tanks 21b, which store low-temperature water (exemplarily, 30 to 40 °C) and a pressure-holding gas before the heat storage stage. First, for example, the third cold water valve 77 and the fourth hot water valve 68 are opened, and the remaining valves are closed. The energy storage pump 33 transports the low-temperature water stored in the third tank 213 through the cold water branch pipe 542 where the third cold water valve 77 is located and the cold water main pipe 541 to the energy storage heat exchanger 31 for heat exchange and temperature rise. After the temperature rise, the water temperature reaches, for example, 150 to 220 degrees Celsius and becomes high-temperature water. The high-temperature water enters the fourth tank 214 through the hot water main pipe 531 and the hot water branch pipe 532 where the fourth hot water valve 68 is located. That is, after all the water in the third tank 213 completely enters the fourth tank 214, the third tank 213 becomes an empty inverted tank, and the fourth tank 214 stores high-temperature water. Then, the third cold water valve 77 and the fourth hot water valve 68 are closed, and the second cold water valve 76 and the third hot water valve 67 are opened (the remaining valves remain unchanged). The energy storage pump 33 transports the low-temperature water stored in the second tank 212 through the cold water branch pipe 542 where the second cold water valve 76 is located and the cold water main pipe 541 to the energy storage heat exchanger 31 for temperature rise. The heated water enters the third tank 213 through the hot water main pipe 531 and the hot water branch pipe 532 where the third hot water valve 67 is located. When all the water in the second tank 212 completely enters the third tank 213, the second tank 212 becomes an empty inverted tank, and the third tank 213 stores high-temperature water. By analogy, after the heat storage stage is completed, the first tank 211 stores a pressure-holding gas, and the second tank 212, the third tank 213, and the fourth tank 214 store the heated (high-temperature water) water and a pressure-holding gas.

[0073] During the exothermic stage, first open the first cold water valve 75 and the second hot water valve 66, and keep the other valves closed. The energy release pump 43 transports the high-temperature water in the second tank 212 through the hot water branch pipe 532 where the second hot water valve 66 is located and the hot water main pipeline 531 to the energy release heat exchanger 41 for cooling. The cooled water enters the first tank 211 through the cold water main pipeline 541 and the cold water branch pipe 542 where the first cold water valve 75 is located. When the water in the second tank 212 is completely transferred into the first tank 211, the second tank 212 becomes an empty inverted tank, and the first tank 211 stores low-temperature water. Then, close the first cold water valve 75 and the second hot water valve 66, open the second cold water valve 76 and the third hot water valve 67 (keep the other valves unchanged). The energy release pump 43 transports the high-temperature water in the third tank 213 through the hot water branch pipe 532 where the third hot water valve 67 is located and the hot water main pipeline 531 to the energy release heat exchanger 41 for cooling. The cooled water is transported to the second tank 212 through the cold water main pipeline 541 and the cold water branch pipe 542 where the second cold water valve 76 is located. After the high-temperature water in the third tank 213 completely enters the second tank 212, the third tank 213 becomes an empty inverted tank, and the second tank 212 stores cold water. Proceed in this way. After the exothermic stage is completed, the fourth tank 214 stores pressurized gas, and the first tank 211, the second tank 212, and the third tank 213 store cooled water (low-temperature water). Of course, the above-mentioned usage switching order of each outlet tank is only for illustration, and the specific switching order is not limited in this embodiment.

[0074] That is, through the above setting that each storage tank is respectively connected to the hot water main pipeline 531 through the corresponding hot water branch pipe 532, and the cold water branch pipe 542 corresponding to each storage tank is connected to the cold water main pipeline 531, the energy storage heat exchanger 31 is respectively connected to the hot water main pipeline 531 and the cold water main pipeline 541, and the energy release heat exchanger 41 is connected to the hot water main pipeline 531 and the cold water main pipeline 541, the inverted tanks 21b in multiple storage tanks can be alternately used as cold storage tanks or heat storage tanks. Compared with the structure where cold storage tanks and heat storage tanks are separately set, the number of storage tanks can be reduced in this embodiment, and the investment cost can be reduced. And the hot water main pipeline 531 and the cold water main pipeline 541 can be shared during the energy storage stage and the energy release stage, which can reduce the pipeline layout and the construction cost. Also, the inlet end of the energy storage heat exchanger 31 and the outlet end of the energy release heat exchanger 41 are connected to the cold water main pipeline 541, and the outlet end of the energy storage heat exchanger 31 and the inlet end of the energy release heat exchanger 41 are connected to the hot water main pipeline 531, so that whether it is the heat storage stage or the exothermic stage, the cold water main pipeline 541 and the cold water branch pipe 542 always transport low-temperature water, and the hot water main pipeline 531 and the hot water branch pipe 532 always transport high-temperature water. The situation of low-temperature water and high-temperature water alternating in the cold water pipeline 54 and the hot water pipeline 53 will not occur, which can improve the heat exchange efficiency.

[0075] An embodiment of the present invention further provides a pressure stabilizing method for a water heat storage and release system. Based on the pressure stabilizing device for a water heat storage and release system provided in the foregoing embodiment, the pressure stabilizing method includes: when the pressure in the heat storage medium storage unit 20 is lower than the first preset pressure, the pressurizing unit 12 pressurizes the pressure maintaining gas stored in the pressure stabilizing container 11 and transports it to the heat storage medium storage unit 20; when the pressure in the heat storage medium storage unit 20 is higher than the first preset pressure, the output unit 13 receives the pressure maintaining gas output from the heat storage medium storage unit 20 and transports it to the pressure stabilizing container 11 for storage. The pressure stabilizing method provided in this embodiment replenishes the pressure maintaining gas by the pressurizing unit 12 when the pressure in the heat storage medium storage unit 20 is low through the pressure stabilizing part 10 of the pressure stabilizing device, and transports the pressure maintaining gas to the pressure stabilizing container 11 for storage by the output unit 13 when the pressure in the heat storage medium storage unit 20 is high, which can ensure that the pressure in the heat storage medium storage unit 20 will not fluctuate greatly with the changes in the volume and temperature of the heat storage medium, and the system is safe and reliable. And through the interactive flow of the pressure maintaining gas between the pressure stabilizing part 10 of the pressure stabilizing device and the heat storage medium storage unit 20, the pressure maintaining gas can be recycled and not discharged during normal operation, and only needs to be replenished before the operation of the water heat storage and release system, which can reduce the consumption of resources and achieve the efficient utilization of resources.

[0076] For other specific implementation steps of the heat storage and release method provided in this embodiment, reference can be made to the description of the foregoing embodiment, and details will not be repeated here.

[0077] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A voltage stabilizing device for a water storage heat release system, characterized in that, Comprising: A heat storage medium storage unit; A pressure stabilizing vessel for storing a pressure maintaining gas; A pressurizing unit, the input end of the pressurizing unit is connected to the pressure stabilizing vessel, and the output end of the pressurizing unit is connected to the heat storage medium storage unit; the pressurizing unit is configured to, when the pressure in the heat storage medium storage unit is lower than a first preset pressure, pressurize the pressure maintaining gas stored in the pressure stabilizing vessel and then transport it to the heat storage medium storage unit; An output unit, the output end of the output unit is connected to the pressure stabilizing vessel, and the input end of the output unit is configured to be connected to the heat storage medium storage unit; the output unit is configured to, when the pressure in the heat storage medium storage unit is higher than the first preset pressure, receive the pressure maintaining gas output from the heat storage medium storage unit and transport it to the pressure stabilizing vessel for storage; Wherein, the heat storage medium storage unit includes a plurality of storage tanks, and the plurality of storage tanks at least include a constant-pressure hot tank, a constant-pressure cold tank, and a transfer tank; After the end of the heat release stage and before the start of the heat storage stage, the constant-pressure hot tank is used to store the pressure maintaining gas, and the constant-pressure cold tank and the transfer tank are used to store low-temperature water and store the pressure maintaining gas at the top; after the end of the heat storage stage and before the start of the heat release stage, the constant-pressure hot tank and the transfer tank are used to store high-temperature water and store the pressure maintaining gas at the top, and the constant-pressure cold tank is used to store the pressure maintaining gas; during the heat storage stage, the transfer tank storing the low-temperature water and the constant-pressure cold tank storing the low-temperature water are used to output the low-temperature water to be heated and stored as the high-temperature water, and the constant-pressure hot tank is used to receive and store the high-temperature water after heat storage heating; during the heat release stage, the transfer tank storing the high-temperature water and the constant-pressure hot tank storing the high-temperature water are used to output the high-temperature water to be cooled and released as the low-temperature water, and the constant-pressure cold tank is used to receive and store the low-temperature water after heat release cooling.

2. The voltage stabilizing device for a water heat storage and release system according to claim 1, characterized in that, The pressurizing unit includes a pressurizing pipeline and a pressurizing pump. The opposite ends of the pressurizing pipeline are respectively the input end and the output end of the pressurizing unit. The pressurizing pump is arranged on the pressurizing pipeline, and the inlet end of the pressurizing pump is connected to the pressure stabilizing vessel.

3. The voltage stabilizing device for the water storage and heat release system according to claim 2, characterized in that, The pressurizing unit further includes a first cooling member arranged on the pressurizing pipeline, and the first cooling member is located between the outlet end of the pressurizing pump and the output end of the pressurizing unit; the first cooling member is used to cool the pressure maintaining gas output from the pressurizing pump.

4. The voltage stabilizing device for the water storage and heat release system according to claim 3, characterized in that, The output unit includes an output pipeline. The opposite ends of the output pipeline are respectively the input end and the output end of the output unit. The output unit includes a second cooling member, and the second cooling member is used to cool the pressure maintaining gas output from the heat storage medium storage unit; or the output pipeline shares a first pipe segment of the pressurizing pipeline, and the first cooling member is arranged on the first pipe segment. The output unit and the pressurizing unit share the first cooling member, and the first cooling member is further used to cool the pressure maintaining gas output from the heat storage medium storage unit.

5. The pressure stabilizing device for a water storage and heat release system according to claim 1, characterized in that, The output unit includes a pressure stabilizing valve for maintaining the pressure of the pressure-holding gas output from the output end of the output unit stable at a second preset pressure; and / or, the output unit further includes a balance valve for automatically opening when the pressure in the heat storage medium storage unit is higher than a first preset pressure to enable the output unit to receive the pressure-holding gas output from the heat storage medium storage unit, and closing when the pressure in the heat storage medium storage unit is less than or equal to the first preset pressure to isolate the output unit from the heat storage medium storage unit.

6. The voltage stabilizing device for the water storage and heat release system according to claim 1, characterized in that, It further includes a pressure detection unit and a control valve. The pressure detection unit is used to detect the pressure in the heat storage medium storage unit; the first end of the control valve is used to connect to the heat storage medium storage unit; the second end of the control valve is connected to the output end of the pressurizing unit. The control valve is used to open when the pressure detection unit detects that the pressure in the heat storage medium storage unit is lower than the first preset pressure to conduct the pressurizing unit and the heat storage medium storage unit; and / or the second end of the control valve is connected to the input end of the output unit. The control valve is used to open when the pressure detection unit detects that the pressure in the heat storage medium storage unit is higher than the first preset pressure to conduct the output unit and the heat storage medium storage unit.

7. The pressure stabilizing device for a water heat storage and release system according to claim 1, characterized in that the number of the inverted tanks is one. During the heat storage stage, the inverted tank is used to output the low-temperature water that has been heated to high-temperature water through heat storage and transport it to the constant-pressure hot tank. The constant-pressure cold tank is used to output the low-temperature water that has been heated to high-temperature water through heat storage and transport it to the inverted tank after the inverted tank has completed outputting the low-temperature water; during the heat release stage, the inverted tank is used to output the high-temperature water that has been cooled to low-temperature water through heat release and transport it to the constant-pressure cold tank. The constant-pressure hot tank is used to output the high-temperature water that has been cooled to low-temperature water through heat release and transport it to the inverted tank after the inverted tank has completed outputting the high-temperature water; or the number of the inverted tanks is more than one. During the heat storage stage, one of the more than one inverted tanks is used to output the low-temperature water that has been heated to high-temperature water through heat storage and transport it to the constant-pressure hot tank or another inverted tank. After one inverted tank has completed outputting the low-temperature water, it becomes an empty inverted tank. Another inverted tank or the constant-pressure cold tank among the inverted tanks is used to output the low-temperature water that has been heated to high-temperature water through heat storage and transport it to the empty inverted tank; during the heat release stage, one of the more than one inverted tanks is used to output the high-temperature water that has been cooled through heat release and transport it to the constant-pressure cold tank or another inverted tank. After one inverted tank has completed outputting the high-temperature water, it becomes an empty inverted tank. Another inverted tank or the constant-pressure hot tank among the inverted tanks is used to output the high-temperature water that has been cooled to low-temperature water through heat release and transport it to the empty inverted tank.

8. The voltage stabilizing device for the water storage and heat release system according to claim 1, characterized in that, It further includes a constant-pressure pipe. The input end of the output unit and the output end of the boosting unit are respectively connected to the constant-pressure pipe, and the top of each of the multiple storage tanks is respectively communicated with the constant-pressure pipe; the constant-pressure pipe is used to conduct the gas-phase spaces at the tops of the multiple storage tanks to balance the pressures in the multiple storage tanks.

9. A water storage and heat release system, characterized in that, It includes the voltage stabilizing device according to any one of claims 1 to 8, and further includes a water inlet pipeline and a water outlet pipeline. The water inlet pipeline includes a main water inlet pipe and a plurality of water inlet branch pipes connected to the multiple storage tanks in one-to-one correspondence, and the plurality of water inlet branch pipes are respectively connected to the main water inlet pipe; the water outlet pipeline includes a main water outlet pipe and a plurality of water outlet branch pipes connected to the multiple storage tanks in one-to-one correspondence, and the plurality of water outlet branch pipes are respectively connected to the main water outlet pipe; The water storage and heat release system further includes a heat storage heat exchanger. The main water outlet pipe is used to be connected to the inlet end of the heat storage heat exchanger, and the main water inlet pipe is used to be connected to the outlet end of the heat storage heat exchanger; the inverted tank and the constant-pressure cold tank are used to output the low-temperature water to the main water outlet pipe through the water outlet branch pipes during the heat storage stage and heat it up to high-temperature water via the heat storage heat exchanger, and the constant-pressure hot tank and the inverted tank are used to receive the high-temperature water output from the heat storage heat exchanger to the main water inlet pipe through the water inlet branch pipes during the heat storage stage; The water storage and heat release system further includes an energy release heat exchanger. The main water outlet pipe is connected to the inlet end of the energy release heat exchanger, and the main water inlet pipe is used to be connected to the outlet end of the energy release heat exchanger; the inverted tank and the constant-pressure hot tank are used to output the high-temperature water to the main water outlet pipe through the water outlet branch pipes during the heat release stage and release heat to cool it down to low-temperature water via the energy release heat exchanger, and the constant-pressure cold tank and the inverted tank are used to receive the low-temperature water output from the energy release heat exchanger to the main water inlet pipe through the water inlet branch pipes during the heat release stage.

10. A water storage and heat release system, characterized in that, It includes the voltage stabilizing device according to any one of claims 1 to 8. The voltage stabilizing device further includes a hot water pipeline and a cold water pipeline; the hot water pipeline includes a main hot water pipe and a plurality of hot water branch pipes connected to the multiple storage tanks in one-to-one correspondence, and the plurality of hot water branch pipes are respectively connected to the main hot water pipe; the cold water pipeline includes a main cold water pipe and a plurality of cold water branch pipes connected to the multiple storage tanks in one-to-one correspondence, and the plurality of cold water branch pipes are respectively connected to the main cold water pipe; The water storage and heat release system further includes a heat storage heat exchanger. The cold water main pipe is used to connect to the inlet end of the heat storage heat exchanger, and the hot water main pipe is used to connect to the outlet end of the heat storage heat exchanger; the inverted tank and the constant-pressure cold tank are used to output the low-temperature water through the cold water branch pipe during the heat storage stage and transport it to the heat storage heat exchanger through the cold water main pipe to be heated into high-temperature water. The constant-pressure hot tank and the inverted tank are used to receive the high-temperature water output from the heat storage heat exchanger to the hot water main pipe through the hot water branch pipe during the heat storage stage; the water storage and heat release system further includes an energy release heat exchanger. The cold water main pipe is used to connect to the outlet end of the energy release heat exchanger, and the hot water main pipe is used to connect to the inlet end of the energy release heat exchanger; the inverted tank and the constant-pressure hot tank are used to output the high-temperature water through the hot water branch pipe during the heat release stage and transport it to the energy release heat exchanger through the hot water main pipe to be cooled into low-temperature water. The constant-pressure cold tank and the inverted tank are used to receive the low-temperature water output from the energy release heat exchanger to the cold water main pipe through the cold water branch pipe during the heat release stage.

11. A voltage stabilization method for a voltage stabilization device of a water storage heat release system, characterized in that, Based on the pressure stabilizing device for a water storage and heat release system according to any one of claims 1 to 8, the pressure stabilizing method includes: when the pressure in the heat storage medium storage unit is lower than a first preset pressure, the pressurizing unit pressurizes the pressure maintaining gas stored in the pressure stabilizing container and transports it to the heat storage medium storage unit; when the pressure in the heat storage medium storage unit is higher than the first preset pressure, the output unit receives the pressure maintaining gas output from the heat storage medium storage unit and transports it to be stored in the pressure stabilizing container.

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