Underwater compressed air energy storage power generation system

Abstract

The invention discloses an underwater compressed air energy storage power generation system. Comprising a functional platform floating on the water surface, an upper end open type water tank fixed to the lower end of the functional platform, a closed rigid underwater energy storage tank connected to the lower end of the upper end open type water tank through a rigid water pipe, and a turbine generator fixed to the functional platform and arranged on a water pipe channel. And the air compression power generation module is fixed on the functional platform and is connected with the closed rigid underwater energy storage tank through a rigid air pipe. According to the underwater compressed air energy storage power generation system, constant-pressure compressed air energy storage and pumped storage are perfectly combined, so that the system efficiency is higher, the suspended system can be conveniently moved to a water area where electric energy needs to be stored and can work after being anchored, construction is easy, maintenance is convenient, the cost is low, and offshore or island users are facilitated.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to an underwater compressed air energy storage power generation system. Background Art

[0002] Against the background of "carbon peak and carbon neutrality", renewable energy such as solar energy, wind energy, and tidal energy are developing rapidly. New energy, especially wind energy, solar energy, and tidal energy, which account for a large proportion of the new energy market, are intermittent and unstable, and cannot provide power continuously and stably. The humid, temperature-difference, and corrosive environments at sea or offshore pose huge challenges to the reliability and durability of existing energy storage equipment.

[0003] The industry needs energy storage solutions with large energy storage capacity, high safety, long life, economy and environmental protection. At this time, compressed air energy storage, as a long-term energy storage system, has gradually gained attention due to its advantages such as large energy storage capacity, high safety, long life, economy and environmental protection, and comparable to pumped storage. However, the efficiency of a single energy storage system in actual use cannot achieve the ideal effect, and the existing underwater compressed air energy storage systems are all fixed on the bottom of the water, which is difficult to construct and has low applicability, which is not conducive to offshore use. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an underwater compressed air energy storage power generation system that perfectly combines compressed air energy storage and pumped storage to improve system efficiency.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] The present invention solves the above problems by the following technical means:

[0007] The underwater compressed air energy storage power generation system of the present invention comprises a functional platform floating on the water surface, an upper open water tank fixed to the lower end of the functional platform, a closed rigid underwater energy storage tank connected to the lower end of the upper open water tank through a rigid water pipe, a turbine generator fixed to the functional platform and arranged on the water pipe passage, and an air compression power generation module fixed to the functional platform and connected to the closed rigid underwater energy storage tank through a rigid air pipe.

[0008] Specifically, the air compression power generation module includes an air compressor, a compressed air generator, and a heat energy collector fixed on the functional platform. The air compressor is connected to the closed rigid underwater energy storage tank through a compressed air inlet pipe, the closed rigid underwater energy storage tank is connected to the compressed air generator through a compressed air exhaust pipe, and the heat energy collector is connected to the air outlet end of the air compressor.

[0009] Preferably, an air heater is also fixed on the functional platform, and the air heater is connected to the compressed air exhaust pipe before the compressed air generator.

[0010] Preferably, a plurality of balancing devices are arranged around the top surface of the upper open water tank.

[0011] Preferably, a plurality of the balancing devices are evenly hinged to the upper edge of the upper open water tank.

[0012] Specifically, the balancing device includes a hinged rod hinged to the upper edge of the upper open water tank, and a stabilizing wing arranged at the end of the hinged rod.

[0013] Preferably, a wave generator is also mounted on the hinged rod.

[0014] Preferably, the water pipe includes a first vertical pipe whose lower end extends into the bottom of the closed rigid underwater energy storage tank and whose upper end passes through the upper open water tank and is connected to one end of the turbine generator, and a second vertical pipe connected to the other end of the turbine generator and extending downward into the bottom of the upper open water tank.

[0015] Preferably, a guide cone is provided at the bottom of the closed rigid underwater energy storage tank corresponding to the first water inlet and outlet of the first vertical pipe.

[0016] Preferably, a solar panel is also provided on the functional platform.

[0017] It can be seen from the above technical solution that the present invention has the following beneficial effects:

[0018] The underwater compressed air energy storage and power generation system of the present invention is connected to the upper open water tank at a high position and the lower closed rigid underwater energy storage tank through the water pipe, and there is a certain height difference between the two. The functional platform is used as a water surface support, and the upper open water tank is used to store water, counterweight, and serve as an upper water storage tank for hydropower generation, so that the closed rigid underwater energy storage tank at the bottom is suspended in the water at a certain depth, so that it can store compressed air and serve as a downstream water tank for hydropower generation. The constant pressure compressed air energy storage and pumped storage are perfectly combined to make the system more efficient. In addition, the suspended system can be easily moved to the water area where electrical energy needs to be stored, and can work after anchoring. It is easy to construct, maintain, and have low cost, which is convenient for offshore or island users. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the underwater compressed air energy storage power generation system of the present invention;

[0020] Figure 2 It is a schematic diagram of the installation of water pipes of the underwater compressed air energy storage power generation system of the present invention;

[0021] Figure 3 It is a schematic structural diagram of the balancing device of the underwater compressed air energy storage power generation system of the present invention.

[0022] like Figure 1-Figure 3 , functional platform-1, upper open water tank-2, water pipe-3, first vertical pipe-31, second vertical pipe-32, closed rigid underwater energy storage tank-4, turbine generator-5, air pipe-6, compressed air intake pipe-61, compressed air exhaust pipe-62, air compression power generation module-7, air compressor-71, compressed air generator-72, air heater-73, balancing device-8, articulated rod-81, stabilizer wing-82, guide cone-9. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0025] The present invention will be described in detail below with reference to the accompanying drawings. Figure 1 As shown: the underwater compressed air energy storage power generation system described in this embodiment includes a functional platform 1 floating on the water surface, an upper open water tank 2 fixed to the lower end of the functional platform 1, a closed rigid underwater energy storage tank 4 connected to the lower end of the upper open water tank 2 through a rigid water pipe 3, a turbine generator 5 fixed on the functional platform 1 and arranged on the passage of the water pipe 3, and an air compression power generation module 7 fixed on the functional platform 1 and connected to the closed rigid underwater energy storage tank 4 through a rigid air pipe 6.

[0026] The underwater compressed air energy storage and power generation system described in this embodiment is connected to the upper open water tank 2 at a high position and the lower closed rigid underwater energy storage tank 4 through the water pipe 3, and there is a certain height difference between the two. The functional platform 1 is used as a water surface support, and the upper open water tank 2 is used to store water, counterweight, and serve as an upper water reservoir for hydropower generation, so that the closed rigid underwater energy storage tank 4 at the bottom is suspended in the water at a certain depth, so that it can store compressed air and serve as a downstream water tank for hydropower generation. The constant pressure compressed air energy storage and pumped storage are perfectly combined to make the system more efficient. In addition, the suspended system can be easily moved to the waters where electrical energy needs to be stored, and can work after anchoring. It is easy to construct, maintain, and have low cost, which is convenient for offshore or island users.

[0027] Specifically, the air compression power generation module 7 includes an air compressor 71 fixed on the functional platform 1, a compressed air generator 72, and a heat energy collector (not shown in the figure). The air compressor 71 is connected to the closed rigid underwater energy storage tank 4 through a compressed air intake pipe 61, and the closed rigid underwater energy storage tank 4 is connected to the compressed air generator 72 through a compressed air exhaust pipe 62. The heat energy collector is connected to the air outlet end of the air compressor 71, wherein the air compressor 71 is driven by renewable energy, that is, at least one of wind energy, solar energy, tidal energy, and wave energy. When compressed air is stored, the air compressor 71 is controlled by a computer located in the control room to work, the air intake valve is opened, and the compressed air is rushed into the compressed air through the compressed air intake pipe 61. The closed rigid underwater energy storage tank 4, and the water in the closed rigid underwater energy storage tank 4 flows upward through the water pipe 3 to the upper open water tank 2. When the compressed air energy is released, the exhaust valve is opened by the computer in the control room, and the compressed air in the closed rigid underwater energy storage tank 4 is discharged through the compressed air exhaust pipe 62, driving the compressed air generator 72 to output electrical energy. At the same time, the water in the upper open water tank 2 is attracted by the negative pressure and flows downward from the water pipe 3 into the closed rigid underwater energy storage tank 4. In this process, the turbine generator 5 in the water flow channel is driven to output electrical energy. The heat energy collector can collect the heat energy generated when the air is compressed, and the stored heat energy can be directly transferred to the air heater 73, so that the energy is fully utilized.

[0028] As a preferred implementation of the above embodiment, an air heater 73 is also fixed on the functional platform 1. The air heater 73 is connected to the compressed air exhaust pipe 62 before the compressed air generator 72, so that the compressed air is heated before entering the compressed air generator 72, thereby improving the energy release efficiency. Specifically, a part of the electricity generated by the turbine generator 5 is used to provide energy for the air heater 73.

[0029] In order to improve the stability of the energy storage power generation system described in this embodiment so that it can maintain balance on the water surface with big waves, as a preferred implementation of the above embodiment, a plurality of balancing devices 8 are arranged around the top surface of the upper open water tank 2, and the plurality of balancing devices 8 are evenly hinged to the upper edge of the upper open water tank 2, which can adapt to the height of the waves at different positions around, further improve the stability of the whole system, and avoid the situation of capsizing when encountering big waves. Specifically, Figure 3 As shown, the balancing device 8 includes a hinge rod 81 hinged to the upper edge of the upper open water tank 2 , and a stabilizing wing 82 provided at the end of the hinge rod 81 .

[0030] As a preferred implementation of the above embodiment, the articulated rod 81 is also equipped with a wave generator (not shown in the figure), so as to realize three-energy conversion and make the system more efficient.

[0031] As a preferred implementation of the above embodiment, Figure 2 As shown, the water pipe 3 includes a first vertical pipe 31 whose lower end extends into the bottom of the closed rigid underwater energy storage tank 4 and whose upper end passes through the upper open water tank 2 and is connected to one end of the turbine generator 5, and a second vertical pipe 32 connected to the other end of the turbine generator 5 and extending downward into the bottom of the upper open water tank 2. The turbine generator 5 is placed at the highest point of the first vertical pipe 31 and the second vertical pipe 32 to form a siphon structure, which is convenient for the installation and maintenance of the turbine generator 5.

[0032] As a preferred implementation of the above embodiment, a guide cone 9 is provided at the bottom of the closed rigid underwater energy storage tank 4 corresponding to the first water inlet and outlet of the first vertical pipe 31, which not only guides the water flow, but also prevents the downward fast-flowing water flow from impacting the closed rigid underwater energy storage tank 4 and shortening the life of the closed rigid underwater energy storage tank 4.

[0033] In order to further improve the system integration efficiency, as a preferred implementation of the above embodiment, the functional platform 1 is also provided with a solar panel (not shown in the figure).

[0034] In order to further improve the overall strength of the system, as a preferred implementation of the above embodiment, there is also a reinforcement structure (not shown in the figure) between the closed rigid underwater energy storage tank 4 and the upper open water tank 2.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An underwater compressed air energy storage power generation system, characterized in that: The invention comprises a functional platform floating on the water surface, an upper open water tank fixed to the lower end of the functional platform, a closed rigid underwater energy storage tank connected to the lower end of the upper open water tank through a rigid water pipe, a turbine generator fixed to the functional platform and arranged on the water pipe passage, and an air compression power generation module fixed to the functional platform and connected to the closed rigid underwater energy storage tank through a rigid air pipe.

2. An underwater compressed air energy storage power generation system according to claim 1, characterized in that: The air compression power generation module includes an air compressor, a compressed air generator, and a heat energy collector fixed on the functional platform. The air compressor is connected to the closed rigid underwater energy storage tank through a compressed air inlet pipe, the closed rigid underwater energy storage tank is connected to the compressed air generator through a compressed air exhaust pipe, and the heat energy collector is connected to the air outlet end of the air compressor.

3. An underwater compressed air energy storage power generation system according to claim 2, characterized in that: An air heater is also fixed on the functional platform, and the air heater is connected to the compressed air exhaust pipe before the compressed air generator.

4. The underwater compressed air energy storage power generation system according to claim 1, characterized in that: A plurality of balancing devices are arranged around the top surface of the upper open water tank.

5. An underwater compressed air energy storage power generation system according to claim 4, characterized in that: A plurality of the balancing devices are evenly hinged to the upper edge of the upper open water tank.

6. An underwater compressed air energy storage power generation system according to claim 5, characterized in that: The balancing device comprises a hinged rod hinged to the upper edge of the upper open water tank, and a stabilizing wing arranged at the end of the hinged rod.

7. An underwater compressed air energy storage power generation system according to claim 6, characterized in that: The articulated rod is also equipped with a water wave generator.

8. The underwater compressed air energy storage power generation system according to claim 1, characterized in that: The water pipe includes a first vertical pipe whose lower end extends into the bottom of the closed rigid underwater energy storage tank and whose upper end passes through the upper open water tank and is connected to one end of the turbine generator, and a second vertical pipe connected to the other end of the turbine generator and extending downward into the bottom of the upper open water tank.

9. The underwater compressed air energy storage power generation system according to claim 1, characterized in that: The bottom of the closed rigid underwater energy storage tank and the water inlet and outlet at the lower end of the first vertical pipe are provided with guide cones correspondingly.

10. The underwater compressed air energy storage power generation system according to claim 1, characterized in that: The functional platform is also provided with a solar panel.

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