Peak regulation energy storage system and equipment capable of producing water and use method

Abstract

The invention relates to a peak regulation energy storage system and equipment capable of producing water and a using method, and relates to the technical field of air water production, the peak regulation energy storage system comprises a peak regulation energy storage loop, and a liquid-cooled air compressor, an expansion valve, a liquefaction energy storage tank, a booster pump, a heat exchanger and an expansion generator are sequentially arranged on the peak regulation energy storage loop; the water production and heat storage device is communicated with a cooling pipeline of the liquid-cooled air compressor and a hot end pipeline of the heat exchanger, and the water production and heat storage device is used for absorbing heat of the liquid-cooled air compressor, producing water from air by using the heat of the liquid-cooled air compressor and storing the heat for producing water from air; and the stored heat is transmitted to a hot end pipeline of the heat exchanger and exchanges heat with a peak regulation energy storage loop so as to heat high-pressure gas which flows out of the liquefied energy storage tank and is treated by a booster pump, and the high-temperature and high-pressure gas passes through an expansion generator to generate power. The problem that the overall efficiency of the system is affected due to the fact that the compressed air energy storage technology and the air water taking technology are independently arranged in the prior art is solved.

Description

Technical Field

[0001] This invention relates to the field of air-to-water technology, specifically to a peak-shaving energy storage system, equipment, and method of use that can produce water. Background Technology

[0002] The "photovoltaic desertification control" model, which involves constructing large-scale photovoltaic power stations in desert areas to achieve "power generation on the panels and restoration underneath," is an innovative model integrating clean energy production, ecological governance, and economic benefits. It achieves coordinated development of desertification control, power generation, and agriculture through the construction of photovoltaic desert ecological power stations. However, with the rapid growth of photovoltaic power generation capacity, the intermittency, volatility, and unschedulable nature of its power generation pose significant challenges to the stable operation of the power grid. Peak photovoltaic output typically occurs at midday, coinciding with a low electricity demand period. Conversely, the morning and evening hours, when photovoltaic output is lower, coincide with peak electricity demand. This leads to two problems: firstly, excess daytime power generation cannot be fully absorbed, resulting in energy waste; secondly, during nighttime or rainy periods, when photovoltaic power generation is insufficient, traditional energy sources must compensate, increasing the pressure on the power grid for peak shaving. Furthermore, high photovoltaic power generation coincides with low electricity prices, while high prices result in insufficient photovoltaic power generation, significantly impacting the economic efficiency of photovoltaic power stations. Peak-shaving energy storage is needed to address this. Storing surplus photovoltaic power and then releasing it when electricity demand is high can provide greater economic benefits for power station operators.

[0003] On the other hand, photovoltaic desertification control requires a large amount of freshwater for cleaning photovoltaic panels, cooling modules, and "under-panel economy" (planting drought-resistant crops and pasture). Desert regions are extremely water-scarce, and long-distance water transport is costly, becoming a key bottleneck restricting the long-term operation of power plants and maximizing ecological benefits. While traditional air-based water extraction technologies (such as condensation and adsorption) are feasible, their high energy consumption—requiring a continuous large amount of high-quality electricity or heat—leads to high water production costs and hinders their widespread adoption.

[0004] In existing technologies, power plants typically use pumped storage or chemical storage to address peak shaving and valley filling issues. In order to minimize the consumption of grid power, solar energy is generally used to produce water. Hygroscopic materials are used to absorb water vapor in the air at night or during low-temperature periods, and the water vapor is released and condensed into water during the day or when heated.

[0005] However, currently compressed air energy storage and air-to-water extraction technologies are set up independently. During the compressed air energy storage process, the heat of compression is usually carried away and discharged by the cooling water, resulting in a large waste of heat energy. On the other hand, the desorption process in the air-to-water extraction process requires additional heat energy input, leading to repeated energy consumption and affecting the overall efficiency of the system. Summary of the Invention

[0006] This application provides a peak-shaving energy storage system, equipment, and method for producing water, which can solve the problem that in the current technology, compressed air energy storage and air-to-water technology are set up separately. In the compressed air energy storage process, the heat of compression is usually carried away and discharged by cooling water, resulting in a large amount of heat energy wastage. In the air-to-water process, the desorption process requires additional heat energy input, resulting in repeated energy consumption and affecting the overall efficiency of the system.

[0007] In a first aspect, embodiments of this application provide a water-generating peak-shaving energy storage system, comprising: The peak-shaving energy storage circuit is equipped with a liquid-cooled air compressor, an expansion valve, a liquefied energy storage tank, a booster pump, a heat exchanger, and an expansion generator in sequence. A water-generating and heat-storing device is connected to the cooling pipe of the liquid-cooled air compressor and the hot-end pipe of the heat exchanger. The water-generating and heat-storing device is used to absorb the heat from the liquid-cooled air compressor and use the heat from the liquid-cooled air compressor to produce water from air. It stores the heat used for producing water from air and transfers the stored heat to the hot-end pipe of the heat exchanger to exchange heat with the peak-shaving energy storage circuit to heat the high-pressure gas flowing out of the liquefied energy storage tank and processed by the booster pump, so that the high-temperature and high-pressure gas can generate electricity through the expansion generator.

[0008] In one embodiment, the water production and heat storage device includes: A water-generating and heat-storing unit is connected to the cooling pipes of the liquid-cooled air compressor. It is used to absorb the heat from the liquid-cooled air compressor and use the heat from the liquid-cooled air compressor to generate water from air, and to store the heat used for generating water from air. The first heat exchange circuit is connected to the hot end pipeline of the heat exchanger and is used to transfer the heat stored in the water production and heat storage unit to the heat exchanger for heat exchange with the peak-shaving energy storage circuit.

[0009] In one embodiment, the water production and heat storage unit includes a second heat exchange circuit, a first air-to-water tank, a third heat exchange circuit, and a heat storage tank. The second heat exchange circuit is connected to the cooling pipe of the liquid-cooled air compressor and passes through the first air-to-water tank. It is used to absorb the heat from the liquid-cooled air compressor and use the heat from the liquid-cooled air compressor to convert the water obtained from the air in the first air-to-water tank into steam. The third heat exchange circuit passes through the first air-to-water tank and the heat storage tank. It is used to absorb the heat from the steam, convert the steam into water, and store the absorbed heat in the heat storage tank. The first heat exchange circuit passes through the heat storage tank and is used to transfer the heat stored in the heat storage tank to the hot end pipe of the heat exchanger.

[0010] In one embodiment, a water storage tank is also included, which is connected to the first air intake water tank via a pipeline and is used to collect the converted water after steam cooling.

[0011] In one embodiment, the first air-water collection tank is provided with a water-absorbing material, which is used to absorb moisture from the air. The water-absorbing material is wrapped around the outside of the second heat exchange circuit to absorb the heat transferred by the second heat exchange circuit.

[0012] In one embodiment, the peak-shaving energy storage circuit is further provided with a precooler, which is located on the pipeline between the liquid-cooled air compressor and the expansion valve, and is used to cool the compressed air after it has been processed by the liquid-cooled air compressor.

[0013] In one embodiment, the peak-shaving energy storage circuit is further provided with a gas-liquid separator. The gas-liquid separator is located on the pipeline between the expansion valve and the liquefied energy storage tank. The gas-liquid separator is connected to the precooler through a pipeline. The gas-liquid separator is used to separate the air that has not been liquefied after being processed by the expansion valve and to transport the unliquefied air to the precooler.

[0014] Secondly, embodiments of this application also provide a water-generating peak-shaving energy storage device, which includes the aforementioned water-generating peak-shaving energy storage system.

[0015] Thirdly, this application also provides a method for using a water-generating peak-shaving energy storage system, which is implemented using the aforementioned water-generating peak-shaving energy storage system and includes the following steps: If it is during off-peak hours, the air in the peak energy storage circuit is compressed by the liquid-cooled air compressor and then cooled by the expansion valve, turning into liquid air. The liquid air is stored in the liquefied energy storage tank. The water production and heat storage device absorbs the heat from the liquid-cooled air compressor and uses the heat from the liquid-cooled air compressor to produce water from air, storing the heat used for producing water from air. During peak power periods, the liquid air in the liquefied energy storage tank is directed to the booster pump. The heat stored in the water-making and heat storage device is transferred to the heat exchanger. After being processed by the booster pump, the liquid air is vaporized and heated by the heat stored in the water-making and heat storage device, transforming into high-temperature and high-pressure gas. The high-temperature and high-pressure gas generates electricity through an expansion generator and then expands to do work, becoming low-temperature and low-pressure gas.

[0016] In one embodiment, if the peak power period is reached, the first heat exchange circuit is activated, so that the heat in the heat storage box is transferred to the hot end pipeline of the heat exchanger through the first heat exchange circuit to heat the high-pressure gas after being processed by the booster pump.

[0017] The beneficial effects of the technical solutions provided in this application include: In designing this water-producing peak-shaving energy storage system, the peak-shaving energy storage loop is sequentially equipped with a liquid-cooled air compressor, an expansion valve, a liquefied energy storage tank, a booster pump, a heat exchanger, and an expansion generator. The water-producing heat storage device is connected to the cooling pipe of the liquid-cooled air compressor and the hot end pipe of the heat exchanger. The water-producing heat storage device is used to absorb the heat from the liquid-cooled air compressor and use the heat from the liquid-cooled air compressor to produce water from air. It stores the heat used for producing water from air and transfers the stored heat to the hot end pipe of the heat exchanger to exchange heat with the peak-shaving energy storage loop. This heat heats the high-pressure gas flowing out of the liquefied energy storage tank and processed by the booster pump, so that the high-temperature and high-pressure gas generates electricity through the expansion generator. During off-peak hours, the air in the peak-shaving energy storage circuit is compressed by a liquid-cooled air compressor and then cooled by an expansion valve, turning into liquid air. The liquid air is stored in a liquefied energy storage tank. The water-making thermal energy storage device absorbs the heat from the liquid-cooled air compressor and uses this heat to produce water from the air, storing the heat used for this process. During peak hours, the liquid air in the liquefied energy storage tank is directed to a booster pump. The heat stored in the water-making thermal energy storage device is transferred to a heat exchanger. After being processed by the booster pump, the liquid air is vaporized and heated by the heat stored in the water-making thermal energy storage device, turning into high-temperature, high-pressure gas. This high-temperature, high-pressure gas is then used to generate electricity by an expansion generator. After expanding and doing work, it becomes low-temperature, low-pressure gas. The heat of compression generated during the compressed air process is directly used in the desorption stage of the air-to-water extraction process. Through the thermal coupling design of the water production and heat storage device and the peak-shaving energy storage circuit, the air-to-water extraction process and the compressed air energy storage process form an energy cycle closed loop. This reduces the efficiency loss caused by the unidirectional flow of energy in the system and realizes the efficient recycling of energy within the system. This solves the problem that in the current technology, compressed air energy storage and air-to-water extraction technologies are set up independently. In the compressed air energy storage process, the heat of compression is usually carried away and discharged by cooling water, resulting in a large amount of heat energy wastage. At the same time, the desorption stage in the air-to-water extraction process requires additional heat energy input, resulting in repeated energy consumption and affecting the overall efficiency of the system. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an embodiment of a water-generating peak-shaving energy storage system according to the present invention.

[0020] In the diagram: 1. Peak-shaving energy storage circuit; 2. Liquid-cooled air compressor; 3. Expansion valve; 4. Liquefied energy storage tank; 5. Booster pump; 6. Heat exchanger; 7. Expansion generator; 8. Water production and heat storage device; 81. First heat exchange circuit; 82. Second heat exchange circuit; 83. First air-water intake tank; 84. Third heat exchange circuit; 85. Heat storage tank; 9. Water storage tank; 10. Precooler; 11. Gas-liquid separator; 12. Second air-water intake tank. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0022] This application provides a peak-shaving energy storage system, equipment, and usage method that can produce water. It can solve the problem that in the current technology, compressed air energy storage and air-to-water technology are set up separately. In the compressed air energy storage process, the heat of compression is usually carried away and discharged by cooling water, resulting in a large amount of heat energy wastage. In the air-to-water process, the desorption process requires additional heat energy input, resulting in repeated energy consumption and affecting the overall efficiency of the system.

[0023] like Figure 1 As shown, this application provides a water-generating peak-shaving energy storage system, which includes: The peak-shaving energy storage circuit 1 is equipped with a liquid-cooled air compressor 2, an expansion valve 3, a liquefied energy storage tank 4, a booster pump 5, a heat exchanger 6, and an expansion generator 7 in sequence. The water-producing and heat-storing device 8 is connected to the cooling pipe of the liquid-cooled air compressor 2 and the hot end pipe of the heat exchanger 6. The water-producing and heat-storing device 8 is used to absorb the heat of the liquid-cooled air compressor 2 and use the heat of the liquid-cooled air compressor 2 to produce water from air. It stores the heat used for producing water from air and transfers the stored heat to the hot end pipe of the heat exchanger 6 to exchange heat with the peak-shaving energy storage circuit 1 to heat the high-pressure gas flowing out of the liquefied energy storage tank 4 and processed by the booster pump 5, so that the high-temperature and high-pressure gas generates electricity through the expansion generator 7.

[0024] In designing this water-producing peak-shaving energy storage system, the peak-shaving energy storage loop 1 is sequentially equipped with a liquid-cooled air compressor 2, an expansion valve 3, a liquefied energy storage tank 4, a booster pump 5, a heat exchanger 6, and an expansion generator 7. The water-producing heat storage device 8 is connected to the cooling pipe of the liquid-cooled air compressor 2 and to the hot end pipe of the heat exchanger 6. The water-producing heat storage device 8 is used to absorb the heat from the liquid-cooled air compressor 2 and use the heat from the liquid-cooled air compressor 2 to produce water from air. It stores the heat used for producing water from air and transfers the stored heat to the hot end pipe of the heat exchanger 6 to exchange heat with the peak-shaving energy storage loop 1. This heats the high-pressure gas flowing out of the liquefied energy storage tank 4 and processed by the booster pump 5, so that the high-temperature and high-pressure gas generates electricity through the expansion generator 7. During off-peak hours, the air in peak energy storage circuit 1 is compressed by liquid-cooled air compressor 2 and then cooled by expansion valve 3, turning into liquid air. The liquid air is stored in liquefied energy storage tank 4. Water-making and heat storage device 8 absorbs the heat from liquid-cooled air compressor 2 and uses the heat from liquid-cooled air compressor 2 to produce water from air, storing the heat used for air-to-water production. During peak hours, the liquid air in liquefied energy storage tank 4 is directed to booster pump 5. The heat stored in water-making and heat storage device 8 is transferred to heat exchanger 6. After being processed by booster pump 5, the liquid air is vaporized and heated by the heat stored in water-making and heat storage device 8, turning into high-temperature and high-pressure gas. The high-temperature and high-pressure gas generates electricity through expansion generator 7, and after expansion and work, it becomes low-temperature and low-pressure gas. The heat of compression generated during the compressed air process is directly used in the desorption stage of the air-to-water extraction process. Through the thermal coupling design of the water production and heat storage device and the peak-shaving energy storage circuit, the air-to-water extraction process and the compressed air energy storage process form an energy cycle closed loop. This reduces the efficiency loss caused by the unidirectional flow of energy in the system and realizes the efficient recycling of energy within the system. This solves the problem that in the current technology, compressed air energy storage and air-to-water extraction technologies are set up independently. In the compressed air energy storage process, the heat of compression is usually carried away and discharged by cooling water, resulting in a large amount of heat energy wastage. At the same time, the desorption stage in the air-to-water extraction process requires additional heat energy input, resulting in repeated energy consumption and affecting the overall efficiency of the system.

[0025] In this example, high-temperature and high-pressure gas and low-temperature and low-pressure gas are relative concepts, indicating a comparative relationship.

[0026] In this example, both ends of the peak-shaving energy storage circuit 1 are connected to the environment. After the air enters, it passes through the liquid-cooled air compressor 2, expansion valve 3, liquefied energy storage tank 4, booster pump 5, heat exchanger 6 and expansion generator 7 in sequence. After expanding and generating electricity, it is discharged into the environment.

[0027] like Figure 1 As shown, in some optional embodiments, the water production and thermal storage device 8 includes: The water production and heat storage unit is connected to the cooling pipe of the liquid-cooled air compressor 2. It is used to absorb the heat of the liquid-cooled air compressor 2 and use the heat of the liquid-cooled air compressor 2 to produce water from air and store the heat used for producing water from air. The first heat exchange circuit 81 is connected to the hot end pipeline of the heat exchanger 6 and is used to transfer the heat stored in the water production and heat storage unit to the heat exchanger 6 for heat exchange with the peak-shaving energy storage circuit 1.

[0028] This embodiment specifically describes the structure of the water production and thermal storage device 8. The device includes a water production and thermal storage unit and a first heat exchange circuit 81. The water production and thermal storage unit is connected to the cooling pipe of the liquid-cooled air compressor 2, absorbing heat from the compressor and using it to produce water from air, storing the heat generated during the process. The first heat exchange circuit 81 is connected to the hot end pipe of the heat exchanger 6, transferring the heat stored in the water production and thermal storage unit to the heat exchanger 6 for heat exchange with the peak-shaving energy storage circuit 1. The water production and thermal storage unit not only utilizes the heat of compression to produce water from air but also stores the waste heat generated during the water production process. This heat energy is transferred to the heat exchanger 6 through the first heat exchange circuit 81, achieving seamless connection of heat energy from the water production stage to the power generation stage. This reduces efficiency losses caused by unidirectional energy flow within the system and achieves efficient energy recycling within the system.

[0029] like Figure 1 As shown, in some optional embodiments, the water production and heat storage unit includes a second heat exchange circuit 82, a first air-to-water tank 83, a third heat exchange circuit 84, and a heat storage tank 85. The second heat exchange circuit 82 is connected to the cooling pipe of the liquid-cooled air compressor 2 and passes through the first air-to-water tank 83. It is used to absorb the heat from the liquid-cooled air compressor 2 and use the heat from the liquid-cooled air compressor 2 to convert the water obtained from the air in the first air-to-water tank 83 into steam. The third heat exchange circuit 84 passes through the first air-to-water tank 83 and through the heat storage tank 85. It is used to absorb the heat from the steam, convert the steam into water, and store the absorbed heat in the heat storage tank 85. The first heat exchange circuit 81 passes through the heat storage tank 85 and is used to transfer the heat stored in the heat storage tank 85 to the hot end pipe of the heat exchanger 6.

[0030] In this embodiment, the water production and heat storage unit includes a second heat exchange circuit 82, a first air-to-water tank 83, a third heat exchange circuit 84, and a heat storage tank 85. The second heat exchange circuit 82 is connected to the cooling pipe of the liquid-cooled air compressor 2 and passes through the first air-to-water tank 83. It is used to absorb the heat from the liquid-cooled air compressor 2 and use the heat from the liquid-cooled air compressor 2 to convert the water obtained from the air in the first air-to-water tank 83 into steam. The third heat exchange circuit 84 passes through the first air-to-water tank 83 and the heat storage tank 85. It is used to absorb the heat from the steam, convert the steam into water, and store the absorbed heat in the heat storage tank 85. The first heat exchange circuit 81 passes through the heat storage tank 85 and is used to transfer the heat stored in the heat storage tank 85 to the hot end pipe of the heat exchanger 6. By directly connecting the second heat exchange circuit 82 to the cooling pipe of the liquid-cooled air compressor 2, the heat energy generated during the compression process can be directly transferred to the first air-water intake tank 83 without intermediate conversion, so as to convert the moisture in the air into steam, realizing the immediate utilization of the compression heat. The third heat exchange circuit 84 passes through the first air-water intake tank 83 to provide a cold source for steam condensation, so that the steam is converted into water. At the same time, it absorbs and stores the heat released by steam condensation into the heat storage tank 85. The heat storage tank 85 transfers the stored heat to the hot end pipe of the heat exchanger 6 through the first heat exchange circuit 81 for the vaporization process of liquid air, forming a complete heat energy cascade utilization chain. This ensures that the heat energy is effectively utilized before being discharged, which greatly improves the overall utilization efficiency of heat energy. Moreover, without increasing additional energy consumption or reducing energy storage efficiency, freshwater production is transformed into a by-product of peak-shaving energy storage.

[0031] In this example, the heat storage tank 85 is equipped with heat storage material. The working fluid in the first heat exchange circuit 81, the second heat exchange circuit 82, and the third heat exchange circuit 84 is water.

[0032] In this example, a second air-water intake tank 12 is also provided on the peak-shaving energy storage circuit 1. The second air-water intake tank 12 is located on the pipeline between the liquid-cooled air compressor 2 and the expansion generator 7. Air first enters the second air-water intake tank 12, and the water vapor contained therein is adsorbed by the water-absorbing material inside the second air-water intake tank 12, thus achieving dehumidification of the air. The air intake water completes the moisture absorption process. The second air-water intake tank 12 and the first air-water intake tank 83 can be detachably installed on the corresponding circuit. When the moisture absorbed inside the first air-water intake tank 83 is completely desorbed, the system switches to the second air-water intake tank 12 to produce water from the air, and the first air-water intake tank 83 begins to absorb moisture.

[0033] like Figure 1 As shown, in some optional embodiments, a water storage tank 9 is also included, which is connected to the first air intake water tank 83 via a pipeline and is used to collect the converted water after steam cooling.

[0034] In this embodiment, the water-generating peak-shaving energy storage system also includes a water storage tank 9, which is connected to the first air-water intake tank 83 via a pipeline and is used to collect the converted water after steam cooling. The design of the water storage tank 9 enables the system to achieve a complete closed loop from obtaining moisture from the air, heating and desorption, condensation and liquefaction to final collection, ensuring the integrity of the air-water intake process and avoiding water waste caused by the lack of a dedicated collection device in traditional systems.

[0035] like Figure 1 As shown, in some optional embodiments, the first air water tank 83 is provided with water-absorbing material, which is used to absorb moisture from the air. The water-absorbing material covers the outside of the second heat exchange circuit 82 to absorb the heat transferred by the second heat exchange circuit 82.

[0036] In this embodiment, the first air-water collection tank 83 is equipped with a water-absorbing material. The water-absorbing material is used to absorb moisture from the air. The water-absorbing material covers the outside of the second heat exchange circuit 82 to absorb the heat transferred by the second heat exchange circuit 82. The design of the water-absorbing material directly covering the outside of the second heat exchange circuit 82 minimizes the heat transfer path, achieving zero-distance heat conduction from the heat exchange circuit to the water-absorbing material, greatly improving the heat transfer efficiency, and enabling the heat energy to be precisely used in the water decomposition and absorption process.

[0037] like Figure 1 As shown, in some optional embodiments, a precooler 10 is also provided on the peak-shaving energy storage circuit 1. The precooler 10 is located on the pipeline between the liquid-cooled air compressor 2 and the expansion valve 3, and is used to cool the compressed air after it has been processed by the liquid-cooled air compressor 2.

[0038] In this embodiment, a precooler 10 is also provided on the peak-shaving energy storage loop 1. The precooler 10 is located on the pipeline between the liquid-cooled air compressor 2 and the expansion valve 3, and is used to cool the compressed air after it has been processed by the liquid-cooled air compressor 2. The precooler 10 precools the compressed air before it enters the expansion valve 3, which reduces the initial temperature of the air, significantly improves the efficiency of the subsequent expansion and liquefaction process, and reduces the temperature difference that the expansion valve 3 needs to handle by precooling, thus reducing the workload of the expansion valve.

[0039] like Figure 1 As shown, in some optional embodiments, the peak-shaving energy storage loop 1 is also provided with a gas-liquid separator 11. The gas-liquid separator 11 is located on the pipeline between the expansion valve 3 and the liquefied energy storage tank 4. The gas-liquid separator 11 is connected to the precooler 10 through the pipeline. The gas-liquid separator 11 is used to separate the air that has not been liquefied after being processed by the expansion valve 3 and to transport the air that has not been liquefied to the precooler 10.

[0040] In this embodiment, a gas-liquid separator 11 is also provided on the peak-shaving energy storage loop 1. The gas-liquid separator 11 is located on the pipeline between the expansion valve 3 and the liquefied energy storage tank 4. The gas-liquid separator 11 is connected to the precooler 10 through a pipeline. The gas-liquid separator 11 is used to separate the unliquefied air after the expansion valve 3 and deliver the unliquefied air to the precooler 10. The gas-liquid separator 11 directly delivers the unliquefied cold air after the expansion valve 3 to the precooler 10, realizing the immediate recovery of cold energy. The cold energy in the unliquefied air is used to precool the subsequent compressed air, reducing the temperature of the compressed air before entering the expansion valve 3 and improving the liquefaction efficiency. The design of the gas-liquid separator 11 enables the effective recovery and utilization of the cold energy in the unliquefied air and ensures that only liquid air enters the liquefied energy storage tank 4, avoiding the problem of reduced energy storage density caused by the storage of gas-liquid mixtures.

[0041] like Figure 1 As shown, on the one hand, this application also provides a water-generating peak-shaving energy storage device, which includes the above-mentioned water-generating peak-shaving energy storage system.

[0042] In designing this water-producing peak-shaving energy storage system, the peak-shaving energy storage loop 1 is sequentially equipped with a liquid-cooled air compressor 2, an expansion valve 3, a liquefied energy storage tank 4, a booster pump 5, a heat exchanger 6, and an expansion generator 7. The water-producing heat storage device 8 is connected to the cooling pipe of the liquid-cooled air compressor 2 and to the hot end pipe of the heat exchanger 6. The water-producing heat storage device 8 is used to absorb the heat from the liquid-cooled air compressor 2 and use the heat from the liquid-cooled air compressor 2 to produce water from air. It stores the heat used for producing water from air and transfers the stored heat to the hot end pipe of the heat exchanger 6 to exchange heat with the peak-shaving energy storage loop 1. This heats the high-pressure gas flowing out of the liquefied energy storage tank 4 and processed by the booster pump 5, so that the high-temperature and high-pressure gas generates electricity through the expansion generator 7. During off-peak hours, the air in peak energy storage circuit 1 is compressed by liquid-cooled air compressor 2 and then cooled by expansion valve 3, turning into liquid air. The liquid air is stored in liquefied energy storage tank 4. Water-making and heat storage device 8 absorbs the heat from liquid-cooled air compressor 2 and uses the heat from liquid-cooled air compressor 2 to produce water from air, storing the heat used for air-to-water production. During peak hours, the liquid air in liquefied energy storage tank 4 is directed to booster pump 5. The heat stored in water-making and heat storage device 8 is transferred to heat exchanger 6. After being processed by booster pump 5, the liquid air is vaporized and heated by the heat stored in water-making and heat storage device 8, turning into high-temperature and high-pressure gas. The high-temperature and high-pressure gas generates electricity through expansion generator 7, and after expansion and work, it becomes low-temperature and low-pressure gas. The heat of compression generated during the compressed air process is directly used in the desorption stage of the air-to-water extraction process. Through the thermal coupling design of the water production and heat storage device and the peak-shaving energy storage circuit, the air-to-water extraction process and the compressed air energy storage process form an energy cycle closed loop. This reduces the efficiency loss caused by the unidirectional flow of energy in the system and realizes the efficient recycling of energy within the system. This solves the problem that in the current technology, compressed air energy storage and air-to-water extraction technologies are set up independently. In the compressed air energy storage process, the heat of compression is usually carried away and discharged by cooling water, resulting in a large amount of heat energy wastage. At the same time, the desorption stage in the air-to-water extraction process requires additional heat energy input, resulting in repeated energy consumption and affecting the overall efficiency of the system.

[0043] like Figure 1 As shown, on the other hand, this application also provides a method for using a water-generating peak-shaving energy storage system, which is implemented using the aforementioned water-generating peak-shaving energy storage system, including the following steps: If it is during off-peak hours, the air in the peak energy storage circuit 1 is compressed by the liquid-cooled air compressor 2 and then cooled by the expansion valve 3, turning into liquid air. The liquid air is stored in the liquefied energy storage tank 4. The water production and heat storage device 8 absorbs the heat from the liquid-cooled air compressor 2 and uses the heat from the liquid-cooled air compressor 2 to produce water from air, storing the heat used for producing water from air. During peak power periods, the liquid air in the liquefied energy storage tank 4 is directed to the booster pump 5. The heat stored in the water-making and heat storage device 8 is transferred to the heat exchanger 6. After being processed by the booster pump 5, the liquid air is vaporized and heated by the heat stored in the water-making and heat storage device 8, transforming into high-temperature and high-pressure gas. The high-temperature and high-pressure gas generates electricity through the expansion generator 7, and after expanding and doing work, it becomes low-temperature and low-pressure gas.

[0044] In designing this water-producing peak-shaving energy storage system, the peak-shaving energy storage loop 1 is sequentially equipped with a liquid-cooled air compressor 2, an expansion valve 3, a liquefied energy storage tank 4, a booster pump 5, a heat exchanger 6, and an expansion generator 7. The water-producing heat storage device 8 is connected to the cooling pipe of the liquid-cooled air compressor 2 and to the hot end pipe of the heat exchanger 6. The water-producing heat storage device 8 is used to absorb the heat from the liquid-cooled air compressor 2 and use the heat from the liquid-cooled air compressor 2 to produce water from air. It stores the heat used for producing water from air and transfers the stored heat to the hot end pipe of the heat exchanger 6 to exchange heat with the peak-shaving energy storage loop 1. This heats the high-pressure gas flowing out of the liquefied energy storage tank 4 and processed by the booster pump 5, so that the high-temperature and high-pressure gas generates electricity through the expansion generator 7. During off-peak hours, the air in peak energy storage circuit 1 is compressed by liquid-cooled air compressor 2 and then cooled by expansion valve 3, turning into liquid air. The liquid air is stored in liquefied energy storage tank 4. Water-making and heat storage device 8 absorbs the heat from liquid-cooled air compressor 2 and uses the heat from liquid-cooled air compressor 2 to produce water from air, storing the heat used for air-to-water production. During peak hours, the liquid air in liquefied energy storage tank 4 is directed to booster pump 5. The heat stored in water-making and heat storage device 8 is transferred to heat exchanger 6. After being processed by booster pump 5, the liquid air is vaporized and heated by the heat stored in water-making and heat storage device 8, turning into high-temperature and high-pressure gas. The high-temperature and high-pressure gas generates electricity through expansion generator 7, and after expansion and work, it becomes low-temperature and low-pressure gas. The heat of compression generated during the compressed air process is directly used in the desorption stage of the air-to-water extraction process. Through the thermal coupling design of the water production and heat storage device and the peak-shaving energy storage circuit, the air-to-water extraction process and the compressed air energy storage process form an energy cycle closed loop. This reduces the efficiency loss caused by the unidirectional flow of energy in the system and realizes the efficient recycling of energy within the system. This solves the problem that in the current technology, compressed air energy storage and air-to-water extraction technologies are set up independently. In the compressed air energy storage process, the heat of compression is usually carried away and discharged by cooling water, resulting in a large amount of heat energy wastage. At the same time, the desorption stage in the air-to-water extraction process requires additional heat energy input, resulting in repeated energy consumption and affecting the overall efficiency of the system.

[0045] In this example, the condensation heat of the water vapor produced during the air-to-water process can enter the circulating water in the third heat exchange loop 84. The circulating water that has absorbed the heat is directly stored in the heat storage tank 85, thus storing the heat generated during the air-to-water process.

[0046] In this example, the circulating water in the second heat exchange circuit 82 exchanges heat with the liquid-cooled air compressor 2. The circulating water that has absorbed heat heats the water-absorbing material in the first air water tank 83 to generate steam. The condensation heat of the water vapor generated during the air-to-water process can enter the circulating water in the third heat exchange circuit 84. The circulating water that has absorbed heat stores the heat in the heat storage tank 85.

[0047] In some optional embodiments, if the peak power period is entered, the first heat exchange circuit 81 is activated, so that the heat in the heat storage box 85 is transferred to the hot end pipeline of the heat exchanger 6 through the first heat exchange circuit 81 to heat the high-pressure gas after being processed by the booster pump 5.

[0048] In this embodiment, during peak power periods, the first heat exchange circuit 81 is activated, allowing heat from the heat storage tank 85 to be transferred to the hot-end pipe of the heat exchanger 6 via the first heat exchange circuit 81, thereby heating the high-pressure gas processed by the booster pump 5. By transferring this heat energy to the heat exchanger 6 through the first heat exchange circuit 81, a seamless connection between the water production and power generation stages is achieved, reducing efficiency losses caused by unidirectional energy flow within the system and realizing efficient energy recycling within the system.

[0049] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0050] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A peak-shaving energy storage system capable of producing water, characterized in that, include: The peak-shaving energy storage circuit (1) is equipped with a liquid-cooled air compressor (2), an expansion valve (3), a liquefied energy storage tank (4), a booster pump (5), a heat exchanger (6), and an expansion generator (7) in sequence. The water-making and heat storage device (8) is connected to the cooling pipe of the liquid-cooled air compressor (2) and the hot end pipe of the heat exchanger (6). The water-making and heat storage device (8) is used to absorb the heat of the liquid-cooled air compressor (2) and use the heat of the liquid-cooled air compressor (2) to make water from air. It stores the heat used for making water from air and transfers the stored heat to the hot end pipe of the heat exchanger (6) to exchange heat with the peak energy storage circuit (1) to heat the high-pressure gas flowing out of the liquefied energy storage tank (4) and processed by the booster pump (5), so that the high-temperature and high-pressure gas generates electricity through the expansion generator (7).

2. The water-generating peak-shaving energy storage system as described in claim 1, characterized in that, The water production and heat storage device (8) includes: A water-making and heat storage unit is connected to the cooling pipe of the liquid-cooled air compressor (2) to absorb the heat of the liquid-cooled air compressor (2) and use the heat of the liquid-cooled air compressor (2) to make water from air and store the heat for making water from air. The first heat exchange circuit (81) is connected to the hot end pipeline of the heat exchanger (6) and is used to transfer the heat stored in the water production and heat storage unit to the heat exchanger (6) for heat exchange with the peak-shaving energy storage circuit (1).

3. A peak-shaving energy storage system capable of producing water as described in claim 2, characterized in that, The water production and heat storage unit includes a second heat exchange circuit (82), a first air-water intake tank (83), a third heat exchange circuit (84), and a heat storage tank (85). The second heat exchange circuit (82) is connected to the cooling pipe of the liquid-cooled air compressor (2) and passes through the first air-water intake tank (83). It is used to absorb the heat of the liquid-cooled air compressor (2) and use the heat of the liquid-cooled air compressor (2) to convert the water obtained from the air in the first air-water intake tank (83) into steam. The third heat exchange circuit (84) passes through the first air-water intake tank (83) and passes through the heat storage tank (85). It is used to absorb the heat of the steam, convert the steam into water, and store the absorbed heat in the heat storage tank (85). The first heat exchange circuit (81) passes through the heat storage tank (85) and is used to transfer the heat stored in the heat storage tank (85) to the hot end pipe of the heat exchanger (6).

4. A water-generating peak-shaving energy storage system as described in claim 3, characterized in that, It also includes a water storage tank (9), which is connected to the first air water intake tank (83) through a pipeline and is used to collect the converted water after steam cooling.

5. A water-generating peak-shaving energy storage system as described in claim 3, characterized in that, The first air water tank (83) is provided with water-absorbing material, which is used to absorb moisture in the air. The water-absorbing material is wrapped around the outside of the second heat exchange circuit (82) to absorb the heat transferred by the second heat exchange circuit (82).

6. A water-generating peak-shaving energy storage system as described in claim 1, characterized in that, The peak-shaving energy storage circuit (1) is also equipped with a precooler (10), which is located on the pipeline between the liquid-cooled air compressor (2) and the expansion valve (3) and is used to cool the compressed air after it has been processed by the liquid-cooled air compressor (2).

7. A water-generating peak-shaving energy storage system as described in claim 6, characterized in that, The peak-shaving energy storage circuit (1) is also equipped with a gas-liquid separator (11). The gas-liquid separator (11) is located on the pipeline between the expansion valve (3) and the liquefied energy storage tank (4). The gas-liquid separator (11) is connected to the precooler (10) through a pipeline. The gas-liquid separator (11) is used to separate the air that has not been liquefied after being processed by the expansion valve (3) and to transport the air that has not been liquefied to the precooler (10).

8. A peak-shaving energy storage device capable of producing water, characterized in that, Including a water-generating peak-shaving energy storage system as described in any one of claims 1-7.

9. A method for using a water-generating peak-shaving energy storage system, characterized in that, The implementation using a water-generating peak-shaving energy storage system as described in any one of claims 1-7 includes the following steps: If it is during off-peak hours, the air in the peak energy storage circuit (1) is compressed by the liquid-cooled air compressor (2) and then cooled by the expansion valve (3), and converted into liquid air. The liquid air is stored in the liquefied energy storage tank (4). The water production and heat storage device (8) absorbs the heat from the liquid-cooled air compressor (2) and uses the heat from the liquid-cooled air compressor (2) to produce water from air and stores the heat used for producing water from air. If the peak power period is entered, the liquid air in the liquefied energy storage tank (4) is controlled to flow to the booster pump (5). The heat stored in the water production and heat storage device (8) is transferred to the heat exchanger (6). After the liquid air is processed by the booster pump (5), it is vaporized and heated by the heat stored in the water production and heat storage device (8), and is converted into high temperature and high pressure gas. The high temperature and high pressure gas generates electricity through the expansion generator (7), and after expansion and work, it becomes low temperature and low pressure gas.

10. The method of using a water-generating peak-shaving energy storage system as described in claim 9, characterized in that, If the peak power period is entered, the first heat exchange circuit (81) is started, so that the heat in the heat storage box (85) is transferred to the hot end pipeline of the heat exchanger (6) through the first heat exchange circuit (81) to heat the high pressure gas after being processed by the booster pump (5).

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