Underwater compressed air energy storage system and method for coordinated operation of underwater compressed air energy storage

Abstract

The application relates to an underwater compressed air energy storage system, a collaborative operation method and device of the underwater compressed air energy storage, computer equipment, a storage medium and a computer program product. The system comprises the following steps: in the case that output information of offshore renewable energy is detected to be lower than a first output threshold, a valve of a water inlet is closed, a valve of a water outlet is opened, a pipeline between a water storage cavity and a reverse osmosis seawater desalination assembly is communicated, a compressor set is started, external air is compressed by the compressor set, compressed air is obtained, the compressed air is transported to the air storage cavity for storage, and in the case that the compressed air in the air storage cavity is continuously increased, the water storage cavity is continuously extruded by the compressed air in the air storage cavity, and then the water storage cavity uses the extrusion force to transport the stored seawater in the water storage cavity to the reverse osmosis seawater desalination assembly through the water outlet. The system can improve the efficiency of offshore renewable energy storage and energy release.

Description

Technical Field

[0001] This application relates to the field of new energy technology, and in particular to an underwater compressed air energy storage system, a method, apparatus, computer equipment, storage medium and computer program product for the coordinated operation of underwater compressed air energy storage. Background Technology

[0002] For a long time, fossil fuels have occupied the main position in energy supply.

[0003] As one of the richest natural resources on Earth, the ocean is a strategic space that combines the potential for renewable energy development with the value of seawater resource utilization, and is an important resource source for humankind's sustainable development.

[0004] However, the high energy consumption of traditional offshore renewable energy power generation and seawater desalination plants limits their further development. Summary of the Invention

[0005] Based on this, it is necessary to provide an underwater compressed air energy storage system, a method, apparatus, computer equipment, computer-readable storage medium, and computer program product that can improve the energy storage efficiency of offshore renewable energy and reduce the energy consumption of seawater desalination, in response to the above-mentioned technical problems.

[0006] In a first aspect, this application provides an underwater compressed air energy storage system. The system includes: a water-air co-storage device, a reverse osmosis seawater desalination assembly, a compressor unit, an expander unit, and an intelligent control unit; the water-air co-storage device is connected to both the compressor unit and the expander unit; the water-air co-storage device is internally divided into an air storage chamber and a water storage chamber by a water-air separation component; the water storage chamber includes at least an inlet and a water outlet connected to the reverse osmosis seawater desalination assembly;

[0007] The intelligent control unit is used to close the valve of the water inlet and open the valve of the water outlet when the power output information of the offshore renewable energy is detected to be lower than a first power output threshold, thereby connecting the pipeline between the water storage chamber and the reverse osmosis seawater desalination component; and start the compressor unit.

[0008] The compressor unit is used to compress underwater air to obtain compressed air, and then deliver the compressed air to the air storage chamber for storage.

[0009] The water storage chamber is used to compress the compressed air in the air storage chamber as the compressed air in the air storage chamber increases, and to use the compressive force to transport the seawater stored in the water storage chamber to the reverse osmosis seawater desalination component through the water outlet.

[0010] The intelligent control unit is also used to close the valve of the water inlet and open the valve of the seawater inlet when the power output information of the offshore renewable energy is detected to be higher than the second power output threshold, so that external seawater can flow into the water storage chamber.

[0011] The gas storage chamber is also used to push the compressed gas in the gas storage chamber into the expander unit when the seawater in the water storage chamber is continuously increasing, driven by the seawater in the water storage chamber.

[0012] In one embodiment, the system further includes: an electric motor and a generator;

[0013] The expander unit is used to rotate when the compressed air is obtained, so as to drive the generator to generate electricity and obtain electrical energy;

[0014] The electric motor is used to drive the compressor unit to perform air compression using the electrical energy.

[0015] In one embodiment, the system further includes a thermal management module; the thermal management module includes a heat exchanger and a heat storage tank;

[0016] The compressor unit is also used to generate heat during the air compression process of the underwater air;

[0017] The heat exchanger is used to transfer the heat to the heat storage tank;

[0018] The heat exchanger is also used to heat the gas at the inlet of the expander unit based on the heat in the heat storage tank during the process of pushing the compressed gas into the expander unit through the gas storage chamber.

[0019] In one embodiment, the inlet is further provided with a one-way valve and a filter screen;

[0020] The inlet is also used to allow external seawater to flow into the water storage chamber through the one-way valve and the filter screen when the valve of the inlet is opened;

[0021] The one-way valve is used to prevent the backflow of external seawater; the filter screen is used to filter out impurities in the external seawater.

[0022] In one embodiment, the reverse osmosis seawater desalination unit is used to desalinate the input seawater to produce freshwater resources.

[0023] Secondly, this application provides a method for the coordinated operation of underwater compressed air energy storage. The method includes:

[0024] If the output of offshore renewable energy is detected to be lower than the first output threshold, the pipeline between the water storage chamber and the reverse osmosis seawater desalination unit will be connected.

[0025] Obtain compressed air from underwater and deliver the compressed air to a storage chamber for storage;

[0026] As the compressed air in the gas storage chamber increases, the gas storage chamber generates extrusion pressure, and the seawater stored in the water storage chamber is transported to the reverse osmosis seawater desalination unit through the water outlet of the water storage chamber by the extrusion pressure.

[0027] If the power output information of the offshore renewable energy source is detected to be higher than the second power output threshold, the valve of the water inlet is closed, and the valve of the seawater inlet of the water storage chamber is opened at the same time, so that the external seawater can flow into the water storage chamber.

[0028] As the seawater in the water storage chamber increases, a driving force is generated in the water storage chamber, and this driving force is used to push the compressed gas in the gas storage chamber into the expander unit.

[0029] In one embodiment, before connecting the pipeline between the water storage chamber and the reverse osmosis seawater desalination unit, if the output information of the offshore renewable energy source is detected to be lower than a first output threshold, the method further includes:

[0030] Obtain the seawater desalination operating pressure information corresponding to the reverse osmosis seawater desalination component in the underwater compressed air energy storage system;

[0031] Based on the seawater desalination operation pressure information, the deployment depth of the underwater compressed air energy storage system in seawater is determined.

[0032] Thirdly, this application also provides a cooperative operation device for underwater compressed air energy storage. The device includes:

[0033] The pipeline connection module is used to connect the pipeline between the water storage chamber and the reverse osmosis seawater desalination component when the power output information of the offshore renewable energy is detected to be lower than the first power output threshold.

[0034] An air compression module is used to acquire compressed air from underwater and deliver the compressed air to a storage chamber for storage.

[0035] The seawater delivery module is used to generate extrusion pressure in the air storage chamber as the compressed air in the air storage chamber increases continuously, and to deliver the seawater stored in the water storage chamber to the reverse osmosis seawater desalination component through the water outlet of the water storage chamber by the extrusion pressure.

[0036] The water supply module is used to close the valve of the water inlet and open the valve of the seawater inlet of the water storage chamber when the power output information of the offshore renewable energy is detected to be higher than the second power output threshold, so that external seawater can flow into the water storage chamber.

[0037] The gas delivery module is used to generate a driving force in the water storage chamber as the seawater in the water storage chamber continuously increases, and to use the driving force to push the compressed gas in the gas storage chamber into the expander unit.

[0038] Fourthly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0039] If the output of offshore renewable energy is detected to be lower than the first output threshold, the pipeline between the water storage chamber and the reverse osmosis seawater desalination unit will be connected.

[0040] Obtain compressed air from underwater and deliver the compressed air to a storage chamber for storage;

[0041] As the compressed air in the gas storage chamber increases, the gas storage chamber generates extrusion pressure, and the seawater stored in the water storage chamber is transported to the reverse osmosis seawater desalination unit through the water outlet of the water storage chamber by the extrusion pressure.

[0042] If the power output information of the offshore renewable energy source is detected to be higher than the second power output threshold, the valve of the water inlet is closed, and the valve of the seawater inlet of the water storage chamber is opened at the same time, so that the external seawater can flow into the water storage chamber.

[0043] As the seawater in the water storage chamber increases, a driving force is generated in the water storage chamber, and this driving force is used to push the compressed gas in the gas storage chamber into the expander unit.

[0044] Fifthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0045] If the output of offshore renewable energy is detected to be lower than the first output threshold, the pipeline between the water storage chamber and the reverse osmosis seawater desalination unit will be connected.

[0046] Obtain compressed air from underwater and deliver the compressed air to a storage chamber for storage;

[0047] As the compressed air in the gas storage chamber increases, the gas storage chamber generates extrusion pressure, and the seawater stored in the water storage chamber is transported to the reverse osmosis seawater desalination unit through the water outlet of the water storage chamber by the extrusion pressure.

[0048] If the power output information of the offshore renewable energy source is detected to be higher than the second power output threshold, the valve of the water inlet is closed, and the valve of the seawater inlet of the water storage chamber is opened at the same time, so that the external seawater can flow into the water storage chamber.

[0049] As the seawater in the water storage chamber increases, a driving force is generated in the water storage chamber, and this driving force is used to push the compressed gas in the gas storage chamber into the expander unit.

[0050] Sixthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0051] If the output of offshore renewable energy is detected to be lower than the first output threshold, the pipeline between the water storage chamber and the reverse osmosis seawater desalination unit will be connected.

[0052] Obtain compressed air from underwater and deliver the compressed air to a storage chamber for storage;

[0053] As the compressed air in the gas storage chamber increases, the gas storage chamber generates extrusion pressure, and the seawater stored in the water storage chamber is transported to the reverse osmosis seawater desalination unit through the water outlet of the water storage chamber by the extrusion pressure.

[0054] If the power output information of the offshore renewable energy source is detected to be higher than the second power output threshold, the valve of the water inlet is closed, and the valve of the seawater inlet of the water storage chamber is opened at the same time, so that the external seawater can flow into the water storage chamber.

[0055] As the seawater in the water storage chamber increases, a driving force is generated in the water storage chamber, and this driving force is used to push the compressed gas in the gas storage chamber into the expander unit.

[0056] The aforementioned underwater compressed air energy storage system, underwater compressed air energy storage collaborative operation method, device, computer equipment, storage medium, and computer program product, through an intelligent control unit, when the output information of the offshore renewable energy source is detected to be lower than a first output threshold, closes the inlet valve and simultaneously opens the outlet valve, connecting the pipeline between the water storage chamber and the reverse osmosis seawater desalination component; starts the compressor unit; then uses the compressor unit to compress external air to obtain compressed air, which is then delivered to the air storage chamber for storage; as the compressed air in the air storage chamber continuously increases, the water storage chamber is continuously compressed by the compressed air in the air storage chamber, and the water storage chamber uses the compression force to deliver the seawater stored in the water storage chamber to the reverse osmosis seawater desalination component through the outlet, realizing the collaborative operation of energy storage and seawater desalination. By combining underwater compressed air energy storage with reverse osmosis seawater desalination technology, the advantages of marine resources are fully utilized, the energy consumption of seawater desalination is effectively reduced, and it shows great development potential in addressing the current global energy and water resource challenges.

[0057] Furthermore, through the intelligent control unit, when the power output information of offshore renewable energy is detected to be higher than the second power output threshold, the valve of the water inlet is closed, while the valve of the seawater inlet is opened, allowing external seawater to rush into the water storage chamber. As the seawater in the water storage chamber continues to increase, the gas storage chamber is continuously pushed by the seawater in the water storage chamber, and the pushing force is used to push the compressed gas in the gas storage chamber into the expander unit, so that the expander unit can use compressed air to expand and release energy to generate electricity. At the same time, it also replenishes the water reserve for the next round of energy storage and seawater desalination, avoiding system interruption due to insufficient water storage, and effectively improving the efficiency of offshore renewable energy storage and release. Attached Figure Description

[0058] Figure 1 This is an application environment diagram of an underwater compressed air energy storage system in one embodiment;

[0059] Figure 2 This is a cross-sectional schematic diagram of the water-gas co-storage device in one embodiment of the coupling system;

[0060] Figure 3 This is a schematic diagram of the working state of a water-gas co-storage device in an embodiment of an energy storage-seawater desalination synergistic mode;

[0061] Figure 4 This is a schematic diagram of the working state of a water-gas co-storage device in an embodiment of the energy release-water source replenishment synergistic mode;

[0062] Figure 5 This is a flowchart illustrating a collaborative operation method for underwater compressed air energy storage in one embodiment.

[0063] Figure 6This is a structural block diagram of a cooperative operation device for underwater compressed air energy storage in one embodiment;

[0064] Figure 7 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0066] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0067] In one embodiment, an underwater compressed air energy storage system is provided. The underwater compressed air energy storage system is applied to applications such as... Figure 1 The environment shown consists of an offshore renewable energy power plant, a power grid, an underwater compressed air energy storage system, a reverse osmosis seawater desalination unit, and a user demand center. Renewable energy power generation devices such as offshore wind power and offshore photovoltaic systems can be deployed on the sea surface (water level), while water-air co-storage devices can be deployed underwater (water level) for energy storage, energy release, and freshwater supply. Together, the above-sea and underwater devices provide abundant renewable energy power.

[0068] A water-gas co-storage device, a reverse osmosis seawater desalination unit, a compressor unit, an expander unit, and an intelligent control unit; the water-gas co-storage device is connected to the compressor unit and the expander unit respectively; the water-gas co-storage device is divided into a gas storage chamber and a water storage chamber by a water-gas separation component; the water storage chamber includes at least a water inlet and a water outlet connected to the reverse osmosis seawater desalination unit.

[0069] The intelligent control unit is used to close the inlet valve and open the outlet valve when the output of the offshore renewable energy source is detected to be lower than a first output threshold, thereby connecting the pipeline between the storage chamber and the reverse osmosis seawater desalination unit; and to start the compressor unit. The compressor unit is used to compress underwater air to obtain compressed air and deliver it to the gas storage chamber for storage. The water storage chamber is used to be compressed by the compressed air in the gas storage chamber as the compressed air in the gas storage chamber increases, and the compressed force is used to deliver the seawater stored in the water storage chamber to the reverse osmosis seawater desalination unit through the outlet. The intelligent control unit is also used to close the outlet valve and open the seawater inlet valve when the output of the offshore renewable energy source is detected to be higher than a second output threshold, allowing external seawater to flow into the water storage chamber. The gas storage chamber is also used to be pushed by the seawater in the water storage chamber as the seawater in the water storage chamber increases, and the pushing force is used to push the compressed gas in the gas storage chamber into the expander unit.

[0070] The water-air co-storage unit is responsible for water-air separation and pressure transmission. Through water-air separation components or other technologies, the internal structure of the unit is divided into an air storage chamber and a water storage chamber, the volumes of which can be dynamically adjusted. The water storage chamber is connected to the reverse osmosis seawater desalination unit and external seawater (because the water-air co-storage unit is placed underwater) via pipelines and is equipped with controllable valves. It is a key component in coupling underwater compressed air energy storage technology and reverse osmosis seawater desalination technology.

[0071] The compressor unit and expander unit are responsible for compressing underwater air to store energy or expanding compressed air to release energy.

[0072] Among them, the reverse osmosis seawater desalination unit is used to produce fresh water.

[0073] The intelligent control unit is responsible for real-time monitoring and coordination of the operation of each module in the underwater compressed air energy storage system. It supports switching between automatic mode and manual intervention to ensure that the system can flexibly adapt to complex working conditions.

[0074] like Figure 2 As shown, a cross-sectional view of a water-air co-storage device in a coupled system is provided. The device is divided into an air storage chamber (left) and a water storage chamber (right) by a water-air separation component (2). The air storage chamber has at least one air inlet (outlet) for the intake of underwater air and the exhaust of compressed air. The water storage chamber has at least two interfaces: one interface (i.e., the water outlet) for connection to the seawater desalination device and one interface (i.e., the water inlet) for connection to the marine environment. All interfaces (including the water inlet and the water outlet) are controlled by valves connected to them, and their operation is coordinated to match the actual operation and working mode of the system.

[0075] Specifically, the underwater compressed air energy storage system has at least two cooperative operation modes:

[0076] (1) Energy storage-seawater desalination synergistic mode:

[0077] Figure 3 This diagram illustrates the operation of a water-gas co-storage device in a combined energy storage and seawater desalination mode. When the output of surplus power from the grid and offshore renewable energy sources is low (e.g., below the first output threshold), the intelligent control unit closes the valve at the inlet of the water storage chamber in the water-gas co-storage device and simultaneously opens the valve at the outlet of the water storage chamber, connecting the pipeline between the water storage chamber and the reverse osmosis seawater desalination module. Simultaneously, the compressor unit is activated to compress underwater air, producing compressed air, which is then sent to the air storage chamber of the water-gas co-storage device for storage. As the air volume in the air storage chamber increases, the compressed air compresses the seawater stored in the water storage chamber, causing the seawater stored in the water storage chamber to be transported upwards to the reverse osmosis seawater desalination module through the outlet. During this process, the water pressure generated by the seawater supplied to the shore or offshore platform acts in reverse on the compressed air, providing a nearly constant back pressure for the compressor unit, keeping the compressor unit in an isobaric compression state and improving system efficiency. At the same time, based on Pascal's principle, pressure is transmitted, and the pressure of the compressed air is transmitted to the reverse osmosis seawater desalination component through the seawater, directly replacing the driving pressure provided by the traditional high-pressure pump for seawater desalination. This not only realizes the production of fresh water, but also effectively reduces the additional energy consumption of the system when performing reverse osmosis.

[0078] (2) Energy release-water replenishment synergistic model:

[0079] Figure 4 This diagram illustrates the operation of a water-gas co-storage device in the energy release-water replenishment coordinated mode. When there is surplus power from the grid and high output from offshore renewable energy sources, the intelligent control unit closes the valve at the water inlet of the water storage chamber in the water-gas co-storage device, while simultaneously opening the valve at the inlet. This allows external seawater to flow into the water storage chamber through a filter and a one-way valve. The seawater inflow pushes the compressed air stored in the gas storage chamber into the inlet of the expander, simultaneously starting the expander to utilize the input compressed air for expansion and energy release to generate electricity. During this process, the seawater pressure not only provides a relatively stable mass flow rate of compressed air for the expander, ensuring its stable operation, but also replenishes the water reserve for the next round of energy storage and seawater desalination coordination, preventing system interruptions due to insufficient water storage.

[0080] In the aforementioned underwater compressed air energy storage system, the intelligent control unit closes the inlet valve and opens the outlet valve when the output of the marine renewable energy source is detected to be below a first output threshold, thus connecting the pipeline between the storage chamber and the reverse osmosis seawater desalination component. The compressor unit then compresses external air to obtain compressed air, which is then stored in the storage chamber. As the compressed air in the storage chamber increases, the storage chamber is continuously compressed, and the compressed air then uses this pressure to transport the seawater stored within to the reverse osmosis seawater desalination component through the outlet. This achieves coordinated operation of energy storage and seawater desalination. By combining underwater compressed air energy storage with reverse osmosis seawater desalination technology, the advantages of marine resources are fully utilized, effectively reducing the energy consumption of seawater desalination. This system demonstrates significant development potential in addressing current global energy and water resource challenges. Furthermore, through the intelligent control unit, when the power output information of offshore renewable energy is detected to be higher than the second power output threshold, the valve of the water inlet is closed, while the valve of the seawater inlet is opened, allowing external seawater to rush into the water storage chamber. As the seawater in the water storage chamber continues to increase, the gas storage chamber is continuously pushed by the seawater in the water storage chamber, and the pushing force is used to push the compressed gas in the gas storage chamber into the expander unit, so that the expander unit can use compressed air to expand and release energy to generate electricity. At the same time, it also replenishes the water reserve for the next round of energy storage and seawater desalination, avoiding system interruption due to insufficient water storage, and effectively improving the efficiency of offshore renewable energy storage and release.

[0081] In one embodiment, the underwater compressed air energy storage system further includes: an electric motor and a generator; an expander unit for rotating when compressed air is obtained to drive the generator to generate electricity and obtain electrical energy; and an electric motor for driving the compressor unit to perform air compression processing using electrical energy.

[0082] Among them, electric motors and generators are used to complete the conversion of electrical energy into mechanical energy within the system.

[0083] Specifically, in the energy storage-seawater desalination synergistic mode, the electric motor drives the compressor to compress underwater air using electrical energy, and the processed compressed air is stored in a water-air co-storage device. In the energy release-water replenishment synergistic mode, the compressed air input into the expander unit causes the expander unit to rotate, thereby driving the generator to generate electricity. At the same time, external seawater flows into the water storage chamber to replenish the water source, forming a closed loop of "energy storage-water production-energy release-water replenishment".

[0084] In this embodiment, an electric motor drives a compressor unit to perform efficient air compression, converting electrical energy into the potential energy of compressed air for storage. When power generation is needed, the compressed air is released to drive the expander unit to rotate, which in turn drives the generator to convert mechanical energy into electrical energy for output. This achieves the recycling of energy and is conducive to promoting the green and intelligent development of the energy system.

[0085] In one embodiment, the underwater compressed air energy storage system further includes: a thermal management module; the thermal management module includes a heat exchanger and a heat storage tank; a compressor unit, which is also used to generate heat during the air compression process of underwater air; a heat exchanger, which is used to transfer heat to the heat storage tank; and the heat exchanger, which is also used to heat the gas at the inlet of the expander unit based on the heat in the heat storage tank during the process of pushing compressed gas into the expander unit from the gas storage chamber.

[0086] The thermal management module includes a heat exchanger, a thermal storage tank, and a cold storage tank.

[0087] The underwater compressed air energy storage system also includes a thermal management module, which is responsible for recovering and reusing the heat generated during the compression process, thereby improving the system's energy conversion efficiency. Specifically, the compressor unit generates heat during air compression, which is transferred to the heat storage tank via a heat exchanger. During the process of the compressed gas being propelled into the expander unit from the storage chamber, the heat exchanger can also utilize the heat stored in the heat storage tank to heat the compressed air at the expander unit inlet during the energy release phase, thereby increasing the temperature of the compressed air at the expander unit inlet (preheating). This allows the expander unit to operate under optimal parameters, further improving the system's energy conversion efficiency.

[0088] In this embodiment, the compressor unit also generates heat during the air compression process. The heat collected during the compression process is transferred to the compressed air at the inlet of the expander unit through a heat exchanger to increase the work capacity of the expander unit, thereby effectively improving the effect of offshore renewable energy power generation.

[0089] In one embodiment, the inlet is further provided with a one-way valve and a filter screen; the inlet is also used to allow external seawater to flow into the water storage chamber through the one-way valve and the filter screen when the valve of the inlet is opened; wherein, the one-way valve is used to prevent the external seawater from flowing back; the filter screen is used to filter out impurities in the external seawater.

[0090] Specifically, when there is surplus power from the power grid and high output from offshore renewable energy sources, the intelligent control unit closes the valve at the water inlet of the water storage chamber in the water-gas co-storage device, while simultaneously opening the valve at the inlet. This allows external seawater to flow into the storage chamber through the filter screen and one-way valve. Due to the one-way valve, the external seawater can only flow into the storage chamber and cannot flow back out. Furthermore, the filter screen can remove impurities from the seawater, such as seaweed, fish, shrimp, and marine debris.

[0091] In this embodiment, by setting a one-way valve at the inlet, the backflow of external seawater can be effectively prevented, and the seawater transportation efficiency can be improved. Furthermore, by setting a filter screen at the inlet, impurities in the seawater can be filtered out, effectively improving the water quality of the collected seawater, thereby improving the water quality of the freshwater produced using the seawater.

[0092] In one embodiment, a reverse osmosis seawater desalination unit is used to desalinate input seawater to produce freshwater resources.

[0093] Among them, the reverse osmosis seawater desalination unit is a core device that uses reverse osmosis (RO) technology to convert seawater into fresh water. In practical applications, the reverse osmosis seawater desalination unit can be composed of reverse osmosis equipment.

[0094] Specifically, seawater desalination technology uses processes such as reverse osmosis to filter out salt, minerals, and impurities from seawater, producing freshwater that meets drinking or industrial standards. For example, seawater enters a spiral-wound reverse osmosis membrane module. The membrane pore size is approximately 0.1 nanometers, allowing only water molecules to pass through. About 30-50% of the water molecules pass through the membrane layer, while salt (such as...) is removed. , Organic matter is trapped, thus obtaining fresh water.

[0095] In this embodiment, the input seawater is desalinated using a reverse osmosis seawater desalination unit, which removes salt, impurities, and microorganisms to produce freshwater resources that meet the standards. This provides a sustainable freshwater solution and helps promote water resource recycling and sustainable development.

[0096] In one embodiment, such as Figure 5 As shown, a collaborative operation method for underwater compressed air energy storage is provided. This embodiment illustrates the application of this method to an underwater compressed air energy storage system. In this embodiment, the method includes the following steps:

[0097] Step S501: If the output information of the offshore renewable energy source is detected to be lower than the first output threshold, connect the pipeline between the water storage chamber and the reverse osmosis seawater desalination component.

[0098] Step S502: Obtain compressed air from underwater and transport the compressed air to the air storage chamber for storage.

[0099] In step S503, as the compressed air in the gas storage chamber increases, the gas storage chamber generates extrusion pressure, and the seawater stored in the water storage chamber is transported to the reverse osmosis seawater desalination component through the water outlet of the water storage chamber by the extrusion pressure.

[0100] In step S504, if the power output information of the offshore renewable energy source is detected to be higher than the second power output threshold, the valve of the water inlet is closed, and the valve of the seawater inlet of the water storage chamber is opened at the same time, so that the external seawater can flow into the water storage chamber.

[0101] In step S505, as the seawater in the water storage chamber continues to increase, a driving force is generated in the water storage chamber, and the driving force is used to push the compressed gas in the gas storage chamber into the expander unit.

[0102] The specific implementation process of the coordinated operation method of underwater compressed air energy storage is described in the above-mentioned underwater compressed air energy storage system, and will not be repeated here.

[0103] The above-mentioned collaborative operation method of underwater compressed air energy storage can achieve the following beneficial effects: the underwater compressed air energy storage system can solve the problems of low energy storage efficiency and high energy consumption of seawater desalination caused by the volatility of renewable energy by storing compressed air and using technologies such as controlling back pressure and recovering and utilizing compression heat through water-air co-storage structure.

[0104] In one embodiment, before connecting the pipeline between the water storage chamber and the reverse osmosis seawater desalination component in step S501, when the power output information of the offshore renewable energy is detected to be lower than the first power output threshold, the method further includes: obtaining the seawater desalination operating pressure information corresponding to the reverse osmosis seawater desalination component in the underwater compressed air energy storage system; and determining the deployment depth of the underwater compressed air energy storage system in seawater based on the seawater desalination operating pressure information.

[0105] Among them, the seawater desalination operating pressure information refers to the pressure required for the reverse osmosis seawater desalination unit to carry out seawater desalination treatment.

[0106] Specifically, the underwater compressed air energy storage system can also calculate the deployment depth in seawater based on the pressure information required for desalination by the reverse osmosis desalination components, and the varying underwater pressures at different depths on the seabed. The underwater compressed air energy storage system is then deployed on the seabed according to this calculated depth.

[0107] For example, assuming that the pressure range required for reverse osmosis seawater desalination is 5~7.2MPa, then the deployment depth of the underwater compressed air energy storage system should be at least 400 meters below the target depth, with 500-800 meters being the optimal depth.

[0108] In this embodiment, by acquiring the operating pressure data of the reverse osmosis seawater desalination component in the underwater compressed air energy storage system, the underwater deployment depth of the system can be optimized, realizing the coordinated operation of efficient energy storage and freshwater production. Furthermore, based on the operating pressure required for seawater desalination, the deployment depth of the underwater compressed air energy storage system can be intelligently matched, utilizing hydrostatic pressure to reduce the additional energy consumption of reverse osmosis and improve energy utilization efficiency.

[0109] To more clearly illustrate the cooperative operation method for underwater compressed air energy storage provided in this disclosure, a specific embodiment is used below to specifically describe the above-mentioned cooperative operation method for underwater compressed air energy storage. Another cooperative operation method for underwater compressed air energy storage is provided, which can be applied to... Figure 1 The underwater compressed air energy storage system includes the following components:

[0110] Offshore wind and solar power, among other renewable energy sources, possess vast reserves and are widely distributed. Their large-scale development can significantly reduce dependence on fossil fuels. However, the output levels of these renewable energy sources are unstable and intermittent, and direct grid connection can have a significant impact on the stable operation of the power grid. Therefore, this application utilizes Underwater Compressed Air Energy Storage (UWCAES) to convert surplus electricity into compressed air for storage, which is then released to drive power generation during peak electricity demand periods.

[0111] In this embodiment, the back pressure mechanism of the water-air co-storage structure is utilized to achieve isobaric operation of the compressor and coordinated pressure supply for seawater desalination. During the energy storage phase, the compressed air energy storage system can utilize surplus power from the power grid and offshore renewable energy to store compressed air and simultaneously drive the reverse osmosis seawater desalination components to desalinate seawater. During the energy release phase, the compressed air energy storage system can release compressed air to drive the expander to generate electricity, while external seawater flows into the water storage chamber to replenish the water source, forming a closed loop of "energy storage-water production-energy release-water replenishment".

[0112] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0113] Based on the same inventive concept, this application also provides an underwater compressed air energy storage cooperative operation device for implementing the above-mentioned cooperative operation method of underwater compressed air energy storage. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more underwater compressed air energy storage cooperative operation device embodiments provided below can be found in the limitations of the underwater compressed air energy storage cooperative operation method above, and will not be repeated here.

[0114] In one embodiment, such as Figure 6 As shown, an underwater compressed air energy storage cooperative operation device 600 is provided, including: a pipeline connection module 601, an air compression module 602, a seawater delivery module 603, a water supply module 604, and a gas delivery module 605, wherein:

[0115] Pipeline connection module 601 is used to connect the pipeline between the water storage chamber and the reverse osmosis seawater desalination component when the power output information of the offshore renewable energy is detected to be lower than a first power output threshold.

[0116] The air compression module 602 is used to acquire compressed air from underwater and deliver the compressed air to the air storage chamber for storage.

[0117] The seawater delivery module 603 is used to generate extrusion pressure in the air storage chamber as the compressed air in the air storage chamber increases continuously, and to deliver the seawater stored in the water storage chamber to the reverse osmosis seawater desalination component through the water outlet of the water storage chamber by the extrusion pressure.

[0118] The water supply module 604 is used to close the valve of the water inlet and open the valve of the seawater inlet of the water storage chamber when the power output information of the offshore renewable energy is detected to be higher than the second power output threshold, so that the external seawater can flow into the water storage chamber.

[0119] The gas delivery module 605 is used to generate a driving force in the water storage chamber as the seawater in the water storage chamber increases, and to use the driving force to push the compressed gas in the gas storage chamber into the expander unit.

[0120] In one embodiment, the underwater compressed air energy storage collaborative operation device further includes an equipment deployment module, used to acquire seawater desalination operating pressure information corresponding to the reverse osmosis seawater desalination component in the underwater compressed air energy storage system; and to determine the deployment depth of the underwater compressed air energy storage system in seawater based on the seawater desalination operating pressure information.

[0121] Each module in the aforementioned underwater compressed air energy storage collaborative operation device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0122] In one embodiment, a computer device is provided, which may be a server, the server being equipped with an intelligent control unit, and its internal structure diagram may be as follows: Figure 7 As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores data from the intelligent control unit. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a cooperative operation method for underwater compressed air energy storage.

[0123] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0124] In one embodiment, a computer device is also provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in the above method embodiments.

[0125] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon that, when executed by a processor, implements the steps in the above method embodiments.

[0126] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above method embodiments.

[0127] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0128] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. An underwater compressed air energy storage system, characterized in that, The system includes: a water-gas co-storage device, a reverse osmosis seawater desalination assembly, a compressor unit, an expander unit, an intelligent control unit, an electric motor, a generator, and a thermal management module; the water-gas co-storage device is connected to the compressor unit and the expander unit respectively; the water-gas co-storage device is internally divided into a gas storage chamber and a water storage chamber by a water-gas separation component; the water storage chamber includes at least an inlet and a outlet connected to the reverse osmosis seawater desalination assembly; the thermal management module includes a heat exchanger, a thermal storage tank, and a cold storage tank; The intelligent control unit is used to close the valve of the water inlet and open the valve of the water outlet when the power output information of the offshore renewable energy is detected to be lower than a first power output threshold, thereby connecting the pipeline between the water storage chamber and the reverse osmosis seawater desalination component; and start the compressor unit. The expander unit is used to rotate when the compressed air is obtained, so as to drive the generator to generate electricity and obtain electrical energy; The electric motor is used to drive the compressor unit to perform air compression using the electrical energy; The compressor unit is used to compress underwater air to obtain compressed air, and then deliver the compressed air to the air storage chamber for storage. The water storage chamber is used to compress the compressed air in the air storage chamber as the compressed air in the air storage chamber increases, and to use the compressive force to transport the seawater stored in the water storage chamber to the reverse osmosis seawater desalination component through the water outlet. The intelligent control unit is also used to close the valve of the water inlet and open the valve of the water inlet when the power output information of the offshore renewable energy is detected to be higher than the second power output threshold, so that external seawater can flow into the water storage chamber. The gas storage chamber is also used to push the compressed gas in the gas storage chamber into the expander unit when the seawater in the water storage chamber is continuously increasing, driven by the seawater in the water storage chamber. The compressor unit is also used to generate heat during the air compression process of the underwater air; The heat exchanger is used to transfer the heat to the heat storage tank; The heat exchanger is also used to heat the gas at the inlet of the expander unit based on the heat in the heat storage tank during the process of pushing the compressed gas into the expander unit through the gas storage chamber.

2. The system according to claim 1, characterized in that, The inlet is also equipped with a one-way valve and a filter screen; The inlet is also used to allow external seawater to flow into the water storage chamber through the one-way valve and the filter screen when the valve of the inlet is opened; The one-way valve is used to prevent the backflow of external seawater; the filter screen is used to filter out impurities in the external seawater.

3. The system according to claim 1, characterized in that, The reverse osmosis seawater desalination unit is used to desalinate the input seawater to produce freshwater resources.

4. A method for coordinated operation of underwater compressed air energy storage, applied to the underwater compressed air energy storage system according to any one of claims 1 to 3, characterized in that, The method includes: If the output of offshore renewable energy is detected to be lower than the first output threshold, the pipeline between the water storage chamber and the reverse osmosis seawater desalination unit will be connected. Obtain compressed air from underwater and deliver the compressed air to a storage chamber for storage; As the compressed air in the gas storage chamber increases, the gas storage chamber generates extrusion pressure, and the seawater stored in the water storage chamber is transported to the reverse osmosis seawater desalination unit through the water outlet of the water storage chamber by the extrusion pressure. If the power output information of the offshore renewable energy source is detected to be higher than the second power output threshold, the valve of the water inlet is closed, and the valve of the water inlet of the water storage chamber is opened at the same time, so that the external seawater can flow into the water storage chamber. As the seawater in the water storage chamber increases, a driving force is generated in the water storage chamber, and this driving force is used to push the compressed gas in the gas storage chamber into the expander unit.

5. The method according to claim 4, characterized in that, If the output of offshore renewable energy is detected to be below a first output threshold, the pipeline connecting the water storage chamber and the reverse osmosis seawater desalination unit shall include: Obtain the seawater desalination operating pressure information corresponding to the reverse osmosis seawater desalination component in the underwater compressed air energy storage system; Based on the seawater desalination operation pressure information, the deployment depth of the underwater compressed air energy storage system in seawater is determined.

6. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 4 to 5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method described in any one of claims 4 to 5.

8. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 4 to 5.

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