Wave energy collecting device based on compressed air energy storage

Abstract

The invention provides a wave energy collecting device based on compressed air energy storage, and relates to the field of wave energy power generation. The device comprises an air turbine assembly and an energy storage assembly, wherein the air turbine assembly comprises an installation platform (internally provided with a cavity) and a wave energy pressure storage air bag (installed on the lower surface of the platform and changing the air pressure of the cavity along with waves); a turbine air inlet / outlet pipe penetrates through the cavity of the platform and is provided with an air turbine device; the air inlet pipe is provided with a first one-way valve (air flows into the cavity from the outside) and a first electromagnetic valve; the air outlet pipe is provided with a fifth one-way valve (air flows out of the cavity); the energy storage assembly is divided into low pressure and high pressure, the high-pressure assembly is immersed in seawater, the low-pressure assembly is connected with a platform cavity through a low-pressure air inlet pipe and communicated with the high-pressure assembly through an air compressor, and the high-pressure assembly is connected with a turbine air outlet pipe P point (located between a fifth one-way valve and an outlet) through a high-pressure air outlet pipe (provided with a fifth electromagnetic valve and immersed in seawater); seawater is used for cooling the high-pressure gas storage tank, and the gas storage capacity and safety are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wave energy power generation, and in particular to a wave energy collection device based on compressed air energy storage. Background Art

[0002] As a clean, renewable, and abundant marine energy source, wave energy development and utilization has a positive impact on optimizing the energy mix. Currently, wave energy generation technologies are primarily categorized into three types: oscillating water column, oscillating body, and wave-gathering and overtaking. The oscillating water column has become the mainstream technology for industrialization due to its simple structure, high reliability, and adaptability to diverse sea conditions. This technology typically utilizes an air turbine as its core energy conversion component, using air as the medium to convert the mechanical energy generated by wave motion into kinetic energy from compressed air, which in turn drives the turbine to generate electricity.

[0003] However, conventional air turbine devices have the following problems: First, the intake and exhaust share the same pipeline. When the airflow switches from exhaust (compression) to intake (expansion), the direction of the airflow changes, causing turbulence at the end of the pipeline near the air turbine. This further reduces the power driving the air turbine, affecting the power generation effect. The specific reasons are as follows: In wave energy power generation, the gas is subjected to the alternating peaks and troughs of the waves, and thus passes through the air turbine alternately. However, due to the actual length of the pipeline, the gas movement driven by the wave energy, such as the process of internal gas being compressed and discharged, has already reached the next wave peak and trough, resulting in unavoidable turbulence.

[0004] In addition, there is energy loss caused by gas inertia. For example, the speed of the gas changes directly from the speed inside the airbag during intake to the speed outside during exhaust. This process will inevitably cause strong large-scale flow separation and vortexes due to the sudden turn, which will bring certain energy loss.

[0005] Second, the traditional air turbine device does not have an energy storage device. Even if an energy storage device is additionally installed on the traditional air turbine device, the energy storage device cannot reversely drive the traditional air turbine device to generate electricity. For example: Application No. 202310436110.1 discloses an offshore wind power system based on compressed air energy storage and a peak-shaving control method. It mentions that the air compressor 510 is driven by a wind turbine to work and press the air into the energy storage tank 210. However, when the compressed air in the energy storage tank 210 is released, the compressed air will drive the turbine to work and generate electricity. It can be seen from the content of this prior art that the current prior art cannot achieve both power generation and energy storage through only one type of power generation device; or, it cannot achieve energy storage while generating electricity through only one type of power generation device.

[0006] The difficulty of this design is that meeting the above requirements with only one type of power generation device requires studying the distribution and use of valves and pipelines, which is beyond the reach of current technicians.

[0007] For high-voltage energy storage equipment, during the energy storage process, the compressed air increases the internal energy of the gas. Traditional designs do not consider the system's work efficiency and safety, and are not strong in the structural layout of the power generation equipment itself, resulting in poor energy storage efficiency. Summary of the Invention

[0008] In order to overcome the deficiencies in the prior art, the present invention proposes a wave energy collection device based on compressed air energy storage.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions: A wave energy collection device based on compressed air energy storage includes an air turbine assembly and an energy storage assembly, wherein the air turbine assembly includes the following structure: An installation platform having a cavity structure provided therein; The wave energy pressure storage airbag is fixedly connected to the lower surface of the mounting platform. Its internal air channel is connected to the cavity of the mounting platform, and can change the air pressure in the cavity under the ups and downs of waves; The turbine inlet pipe and the turbine outlet pipe are fixedly connected to the mounting platform, with one end of each pipe passing through the mounting platform and being located in the mounting platform cavity, and the other end extending to the outside of the mounting platform. A restraining tube is provided on both the turbine inlet pipe and the turbine outlet pipe, and an air turbine device is installed in the end of the restraining tube away from the mounting platform cavity. The turbine inlet pipe is equipped with a first one-way valve, a fifth one-way valve, and a first solenoid valve. Based on the check principle of the first one-way valve, the gas in the turbine inlet pipe flows from the outside of the mounting platform to the mounting platform cavity. Based on the check principle of the fifth one-way valve, the gas in the turbine outlet pipe flows from the mounting platform cavity to the outside of the mounting platform. The first solenoid valve is located at one end of the turbine inlet pipe that is within the mounting platform cavity, and the fifth one-way valve is located in the middle of the turbine inlet pipe. The energy storage assembly includes a low-pressure energy storage assembly and a high-pressure energy storage assembly, wherein the high-pressure energy storage assembly is located on the lower surface of the mounting platform and is immersed in seawater; the low-pressure energy storage assembly is connected to the cavity of the mounting platform through a low-pressure air inlet pipe, the low-pressure energy storage assembly and the high-pressure energy storage assembly are connected through an air compressor, and the high-pressure energy storage assembly is connected to the turbine outlet pipe through a high-pressure air outlet pipe. The connection position of the high-pressure outlet pipe and the turbine outlet pipe is set as point P, which is located between the fifth one-way valve and the turbine outlet pipe outlet. The high-pressure outlet pipe is equipped with a fifth solenoid valve; the high-pressure outlet pipe is located on the lower surface of the mounting platform and is immersed in seawater.

[0010] The structural design point of this solution is to place the high-pressure outlet pipe of the high-pressure energy storage component in seawater. The advantage is that when the compressed air is used to do work, the high-pressure gas tank will generate a lot of heat. Using seawater to cool the gas in the high-pressure gas tank makes it easier for the gas to be compressed in the high-pressure gas tank. For example, when the pressure of the compressed air in the air compressor remains unchanged, using seawater to cool the gas in the high-pressure gas tank can allow more air to be stored in the high-pressure gas pipe. When the stored air is released to generate electricity, more gas can be used for power generation. Moreover, the high-pressure gas tank is a high-pressure container. If an installation accident occurs, the high-pressure container in seawater can avoid causing damage to other objects on the installation platform.

[0011] On the one hand, the turbine outlet pipe and the turbine inlet pipe are located in the binding pipe, and the intake and exhaust are set to pass through different pipes to reduce the energy loss caused by friction and collision between the intake gas and the exhaust gas. On the other hand, the air is allowed to make a gentle turn from intake to exhaust. By setting low-pressure intake pipes, low-pressure outlet pipes and other pipes, the speed conversion process of the gas from intake to exhaust is extended, reducing the energy loss caused by flow separation and momentum change caused by sudden turning.

[0012] Furthermore, the low-pressure air intake pipe is equipped with a second solenoid valve and a second one-way valve; based on the non-return principle of the second one-way valve, the gas in the low-pressure air intake pipe flows from the cavity of the mounting platform to the low-pressure gas storage tank.

[0013] Furthermore, a low-pressure outlet pipe is fixedly connected to the low-pressure gas storage tank, and one end of the low-pressure outlet pipe away from the low-pressure gas storage tank is fixedly connected to the turbine outlet pipe. The connection point between the low-pressure outlet pipe and the turbine outlet pipe is set as point O, then point O is located between the fifth one-way valve and the first solenoid valve, and the low-pressure outlet pipe is equipped with a third solenoid valve.

[0014] The purpose of the low-pressure outlet pipe is to allow air from the low-pressure air storage tank to flow out independently and enter the air turbine unit in the turbine outlet pipe for power generation, rather than requiring the high-pressure outlet pipe of the high-pressure air storage pipe to bleed air for power generation. Furthermore, this solution places point O on the right side of the fifth one-way valve, with point O and point P on either side of the fifth one-way valve. This design fully ensures safety. If point O were placed on the left side of the fifth one-way valve, if the third solenoid valve were open during a control system logic error, the high-pressure air storage tank would release pressure, causing damage to the low-pressure air storage tank. By placing point O on the right side of the fifth one-way valve, the fifth one-way valve bears the pressure during high-pressure air storage tank bleeds. Therefore, even if a control system logic error occurs, there is no need to worry about the low-pressure air storage tank being affected by the high-pressure air storage tank. Similarly, the fourth and third one-way valves also protect the air compressor and low-pressure air storage tank from another gas flow path.

[0015] Furthermore, the air inlet end of the air compressor is fixedly connected and communicated with the low-pressure air tank through a first pressurized pipe, and the first pressurized pipe is equipped with a third one-way valve and a fourth solenoid valve. Based on the check principle of the third one-way valve, the gas flow direction in the first pressurized pipe is: from the low-pressure air tank to the air compressor; the air outlet end of the air compressor is fixedly connected and communicated with the high-pressure air tank through a second pressurized pipe, and the second pressurized pipe is equipped with a fourth one-way valve. Based on the check principle of the fourth one-way valve, the gas flow direction in the second pressurized pipe is: from the air compressor to the high-pressure air tank.

[0016] Furthermore, the turbine inlet pipe and the turbine outlet pipe are arranged in parallel, and a gap is left between the inner wall of the restraining pipe, the outer wall of the turbine inlet pipe and the turbine outlet pipe, and the gap is filled with sealant.

[0017] If the turbine inlet and outlet pipes were simply passed directly through the mounting platform, gaps would easily form between them, leading to air leakage and further compromising power generation efficiency. This solution uses a regular, sheathed confining tube to encase the turbine inlet and outlet pipes. This makes it easier to inject glue into the confining tube cavity than through the mounting platform's through-holes, thus achieving a more effective seal to prevent air leakage.

[0018] Furthermore, the end surface area of ​​the turbine inlet pipe is larger than the end surface area of ​​the turbine outlet pipe.

[0019] The above technical solution can achieve the following beneficial effects: 1. This solution constrains both the turbine inlet pipe 4 and the turbine outlet pipe 5 to the restraining pipe 3. This separates the intake and outlet, reducing energy losses caused by friction, collision, and turbulence between the intake and outlet gases. Furthermore, by providing low-pressure inlet and outlet pipes, a gentle turning of the gas from intake to exhaust is achieved, reducing energy losses caused by strong flow separation and vortex generation due to sudden turns.

[0020] 2. Through the valve and piping design of this solution, the pressurized air generated by the deformation of the wave energy pressure accumulator can be stored in a low-pressure or high-pressure air tank. The compressed air in the low-pressure or high-pressure air tank is still used to generate electricity through the air turbine device, without the need for additional power generation equipment. Furthermore, the second of the three operating states of this solution can simultaneously store energy and generate electricity, reducing the original power generation capacity rather than completely shutting it off. This allows for both energy storage and small-scale power generation, providing high flexibility.

[0021] 3. In this structural design, the high-pressure energy storage tank is placed below the mounting platform. This design uses seawater to cool the high-pressure energy storage tank as it is inflated. Under the same pressure as the high-pressure energy storage tank, the compression energy storage design using seawater cooling can store more air and consume more air compressor energy compared to designs without seawater cooling. This is because the absence of seawater cooling is equivalent to adiabatic compression, while the use of seawater cooling is equivalent to isothermal compression. Isothermal compression is known to have lower energy consumption and higher efficiency than adiabatic compression. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the device; Figure 2 It is a schematic diagram of the internal structure of the entire device; Figure 3 This is a schematic diagram of the layout relationship between the restraining pipe, the turbine inlet pipe and the turbine outlet pipe; Figure 4 It is the airway flow principle diagram of this device.

[0023] 1. Mounting platform; 2. Wave energy pressure storage airbag; 3. Restraint tube; 4. Turbine inlet pipe; 5. Turbine outlet pipe; 6. Air turbine device; 7. Filter; 8. First solenoid valve; 9. First one-way valve; 10. Low-pressure air tank; 11. Low-pressure air inlet pipe; 12. Second solenoid valve; 13. Second one-way valve; 14. Low-pressure outlet pipe; 15. Third solenoid valve; 16. High-pressure air tank; 17. First pressurizing pipe; 18. Air compressor; 19. Second pressurizing pipe; 20. Fourth one-way valve; 21. High-pressure outlet pipe; 22. Fifth solenoid valve; 23. Pressure reducing valve; 24. Third one-way valve; 25. Fourth solenoid valve; 26. Fifth one-way valve. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] like Figure 1 As shown, a wave energy collection device based on compressed air energy storage includes an air turbine component and an energy storage component.

[0026] The air turbine assembly includes the following structures: The mounting platform 1 is used to be fixedly connected to the offshore support structure (offshore platform) to ensure that its position does not move. A cavity structure is provided inside the mounting platform 1. In this embodiment, the mounting platform 1 is in the shape of a cube.

[0027] The upper end of the wave-energy pressure-accumulating airbag 2 is fixedly connected to the lower surface of the mounting platform 1 and has an open design. Through this opening, the internal airway of the wave-energy pressure-accumulating airbag 2 communicates with the cavity of the mounting platform 1. The lower end of the wave-energy pressure-accumulating airbag 2 is closed and immersed in the seawater. The wave-energy pressure-accumulating airbag 2 adopts a corrugated structure. Under the action of the rising and falling waves, its lower end undergoes vertical reciprocating displacement. Because its upper end is fixedly connected to the offshore platform, its position remains stable, and the reciprocating motion of the lower end continuously compresses and absorbs gas.

[0028] The restraining tube 3 is fixedly connected to the mounting platform 1 , with one end passing through the top surface of the mounting platform 1 and communicating with the internal cavity of the mounting platform 1 , and the other end extending to the outside of the mounting platform 1 .

[0029] like Figure 3 As shown, the turbine inlet pipe 4 and turbine outlet pipe 5 are both fixedly connected to the cavity of the restraining tube 3. Because their diameters are smaller than the inner diameter of the restraining tube 3, a gap for gas to escape is formed between the inner wall of the restraining tube 3 and the outer walls of the turbine inlet pipe 4 and turbine outlet pipe 5. To prevent leakage in these gaps, sealant is filled between the three. This ensures that gas transmission between the cavity of the mounting platform 1 and the outside world occurs only through the turbine inlet pipe 4 and turbine outlet pipe 5, ensuring that the gas flows in the turbine inlet pipe 4 and turbine outlet pipe 5 are separated and do not interfere with each other.

[0030] The turbine inlet pipe 4 and turbine outlet pipe 5, located at one end of the cavity of the mounting platform 1, are equipped with a first check valve 9 and a first solenoid valve 8, respectively. The first solenoid valve 8 is driven by a control system signal and opens or closes according to commands. When the first solenoid valve 8 is open, the gas in the cavity of the mounting platform 1 can flow to the outside through the turbine outlet pipe 5. Due to the non-return principle of the first check valve 9, external gas can enter the cavity of the mounting platform 1 from the turbine inlet pipe 4 and fill the cavity of the wave energy accumulator 2, preventing reverse flow. When the lower end of the wave energy accumulator 2 moves upward, the wave energy accumulator 2 compresses the air inside. The control system can choose whether this air enters the energy storage component for storage or is discharged through the turbine outlet pipe 5. When the lower end of the wave energy accumulator 2 moves downward, the internal cavity of the wave energy accumulator 2 expands, creating a negative pressure, and the outside air is replenished into the cavity of the wave energy accumulator 2 through the turbine inlet pipe 4.

[0031] like Figure 3As shown, the end surface area of ​​the turbine inlet pipe 4 is larger than that of the turbine outlet pipe 5. During exhaust, the gas in the turbine outlet pipe 5 generates a higher flow rate due to the pressure difference. Therefore, despite its smaller flow cross-sectional area, it can still achieve flow matching with the turbine inlet pipe 4. Conventional air turbines use a shared pipeline for both intake and exhaust, resulting in alternating mixing of airflow within the same pipeline, which can easily generate turbulence and vortices. This solution separates the intake and outlet air, allowing each airflow to flow unidirectionally within its own pipeline, avoiding periodic interference. Controlling flow consistency ensures matching flow velocities and pressure gradients within the two pipelines, reducing flow shock caused by flow velocity differences. For example, when the intake flow rate is greater than the exhaust flow rate, excess gas may form vortices within the turbine, increasing flow resistance.

[0032] Moreover, due to its small cross-sectional area, its distribution position in the binding tube 3 makes its outlet align with the edge of the air turbine device 6, reducing its proportion in the binding tube cross section and reducing flow field turbulence caused by gas collision.

[0033] A self-rectifying air turbine 6 is fixedly mounted in the confinement tube 3 via a bracket. It is located outside the cavity of the mounting platform 1. Due to its self-rectifying structure, the self-rectifying air turbine 6 always rotates in the same direction, despite the opposite airflow directions in the turbine inlet pipe 4 and the turbine outlet pipe 5. The end of the confinement tube 3 facing away from the mounting platform cavity is bell-shaped, with the larger end located away from the mounting platform 1. A filter 7 is fixedly connected to the bell-shaped cavity to prevent debris from entering the confinement tube 3. This design also improves air flow within the tube. The smaller bell-shaped end increases the area of ​​the turbine inlet pipe 4 for drawing air from the outside and increases the flow rate of high-pressure gas in the turbine outlet pipe 5, driving the air turbine 6 to rotate faster.

[0034] The energy storage components include low-voltage energy storage components and high-voltage energy storage components.

[0035] Among them, the low-voltage energy storage component includes the following structures: The low-pressure gas storage tank 10 is fixedly connected to the upper surface of the mounting platform 1; The low-pressure air intake pipe 11 is fixedly connected to the mounting platform 1 at one end and communicates with its cavity. The other end is fixedly connected to and communicates with the low-pressure gas storage tank 10. A second solenoid valve 12 and a second check valve 13 are installed on the low-pressure air intake pipe 11 to open and close it. The second solenoid valve 12 is also driven by a signal from the control system, and is opened or closed by command. The second check valve 13 operates on the non-return principle, allowing only the compressed gas in the cavity of the mounting platform 1 to flow into the low-pressure gas storage tank 10 under pressure, effectively preventing the reverse flow of gas from the low-pressure gas storage tank 10 and ensuring the stability and safety of the low-pressure energy storage process.

[0036] The low-pressure outlet pipe 14 has one end fixedly connected to and in communication with the low-pressure gas storage tank 10, and the other end extends through the mounting platform 1 and is fixedly connected to and in communication with the turbine outlet pipe 5. The connection point between the low-pressure outlet pipe 14 and the turbine outlet pipe 5 is set as point O, which is located between the first solenoid valve 8 and the outlet end of the turbine outlet pipe 5. The low-pressure outlet pipe 14 is equipped with a third solenoid valve 15, which is also driven by a control system signal and opens or closes according to commands, thereby opening and closing the low-pressure outlet pipe 14. This design ensures that under different operating conditions, the gas in the low-pressure gas storage tank 10 can be delivered to the air turbine device 6 as set. The turbine outlet pipe 5 is also equipped with a fifth one-way valve 26, located between point O and the outlet end of the turbine outlet pipe 5. Due to the non-return property of the fifth one-way valve 26, external air cannot flow back through the turbine outlet pipe 5 to the wave energy pressure accumulator 2.

[0037] The high-voltage energy storage component includes the following structures: The high-pressure gas storage tank 16 is fixedly connected to the lower surface of the mounting platform; One end of the first pressurized pipe 17 is fixedly connected to and communicates with the low-pressure gas storage tank 10. A fourth solenoid valve 25 and a third check valve 24 are mounted on the first pressurized pipe 17. The fourth solenoid valve 25 is also driven by a control system signal, opening or closing according to commands, thereby controlling the opening and closing of the first pressurized pipe 17. The third check valve 24 operates on the non-return principle, allowing only the compressed gas within the low-pressure gas storage tank 10 to flow into the first pressurized pipe 17 under pressure.

[0038] The air compressor 18 has a gas inlet fixedly connected to and communicated with the other end of the first pressurized pipe 17 , which increases the gas pressure level through mechanical compression to provide power for high-pressure energy storage.

[0039] One end of the second pressurized pipe 19 is fixedly connected to the gas outlet of the air compressor 18, and the other end is fixedly connected to the high-pressure gas storage tank 16 and communicates with its cavity. A fourth one-way valve 20 is mounted on the second pressurized pipe 19. Due to the dual check valve characteristics of the third and fourth one-way valves 24 and 20, the air compressor 18 can only pressurize the air in the low-pressure gas storage tank 10 and enter the high-pressure gas storage tank 16 through the first and second pressurized pipes 17 and 19, ensuring the uniqueness of the gas transmission path and the safety of the energy storage process.

[0040] The high-pressure outlet pipe 21, one end of which is fixedly connected to and in communication with the high-pressure gas storage tank 16 and the other end of which is fixedly connected to and in communication with the turbine outlet pipe 5, is located on the lower surface of the mounting platform 1 and is submerged in the seawater. The connection point between the high-pressure outlet pipe 21 and the turbine outlet pipe 5 is designated as point P, which is located between the fifth check valve 26 and the outlet end of the turbine outlet pipe 5. The high-pressure outlet pipe 21 is equipped with a fifth solenoid valve 22 and a pressure reducing valve 23. The fifth solenoid valve 22 is also driven by signals from the control system, opening or closing according to commands, thereby controlling the opening and closing of the high-pressure outlet pipe 21. The pressure reducing valve 23 is also driven by a control system signal and can adjust the gas pressure at the outlet of the high-pressure outlet pipe 21 by changing the opening. The pressure reducing valve adopts a closed-loop feedback control mechanism, and monitors the outlet pressure of the turbine outlet pipe 5 in real time through a pressure monitoring element, and feeds back to the control system. The control system compares the outlet pressure with the preset pressure parameters and automatically adjusts the valve core position through the electric actuator to ensure that the gas pressure output to the turbine outlet pipe 5 is stable within the working range of the air turbine device 6 in the turbine outlet pipe 5.

[0041] The usage status of this device includes the following: The first state: non-energy storage state.

[0042] In this state, the control system closes the second electromagnetic valve 12 , the third electromagnetic valve 15 , the fourth electromagnetic valve 25 , and the fifth electromagnetic valve 22 , and only opens the first electromagnetic valve 8 .

[0043] When the wave energy pressure storage airbag 2 moves upward to compress the air in its cavity, the air is discharged to the outside from the turbine outlet pipe 5 through the air turbine device 6. Air flows through the air turbine device 6, and the air turbine device 6 rotates and causes the generator shaft to rotate to generate electricity.

[0044] When the wave energy pressure accumulator 2 moves downward, creating negative pressure, outside air flows through the air turbine 6 and into the cavity of the wave energy pressure accumulator 2 through the turbine inlet pipe 4. Similarly, air flowing through the air turbine 6 also drives the air turbine 6 to rotate and generate electricity. The turbine inlet pipe 4 and the turbine outlet pipe 5 separate the air passages, avoiding the turbulence caused by the air turbine 6 sharing the same air passage as in conventional technology.

[0045] The second state: low-voltage energy storage state.

[0046] The control system closes the first solenoid valve 8, the third solenoid valve 15, the fourth solenoid valve 25, and the fifth solenoid valve 22, and only opens the second solenoid valve 12; When the wave energy accumulator 2 moves upward, compressing the air in its cavity, the pressure generated by the wave energy accumulator 2 is much greater than the pressure in the cavity of the low-pressure gas storage tank 10. Therefore, the wave energy accumulator 2 compresses the air in its cavity into the low-pressure gas storage tank 10. When the wave energy accumulator 2 moves downward, creating a negative pressure, outside air enters the cavity of the wave energy accumulator 2 through the air turbine device 6 in the restraining tube 3 and the turbine inlet pipe 4, driving the air turbine device 6 to rotate and generate electricity. Thus, compared to the first state, in this state, the energy generated during the upward movement and compression of the wave energy accumulator 2 is stored as compressed air in the low-pressure gas storage tank 10. The low-pressure gas storage tank 10 contains a pressure monitoring element, and the control system monitors its pressure. During the inflation process, when the pressure of the pressure monitoring element in the low-pressure gas storage tank 10 exceeds the high threshold set by the control system, the control system simultaneously closes the third solenoid valve 15 and the second solenoid valve 12 to stop further inflation of the low-pressure gas storage tank 10.

[0047] When low-pressure gas storage tank 10 needs to release energy, the control system opens third solenoid valve 15 and closes first solenoid valve 8, fourth solenoid valve 25, fifth solenoid valve 22, and second solenoid valve 12. Using the pressure within low-pressure gas storage tank 10, the gas flows through turbine outlet pipe 5 and then through air turbine device 6 within turbine outlet pipe 5, generating electricity. During the release process, if the pressure of the pressure monitoring element within low-pressure gas storage tank 10 falls below the low threshold set in the control system, the control system simultaneously closes third solenoid valve 15 and second solenoid valve 12, halting further release.

[0048] The third state: coordinated state of high-voltage energy storage and power generation.

[0049] When the control system monitors that the pressure in the low-pressure gas storage tank 10 is at the high threshold value in the second state, the control system controls the first solenoid valve 8 and the fourth solenoid valve 25 to open and the air compressor 18 to operate. The second solenoid valve 12, the third solenoid valve 15, and the fifth solenoid valve 22 remain closed. The air compressor 18 pumps gas from the low-pressure gas storage tank 10 into the high-pressure gas storage tank 16 until the pressure in the low-pressure gas storage tank 10 reaches the low threshold value in the second state. At this point, the control system stops the air compressor 18 and closes the fourth solenoid valve 25, the second solenoid valve 12, the third solenoid valve 15, and the fifth solenoid valve 22. The high-pressure gas storage tank 16 also contains a pressure monitoring element. When the pressure exceeds the high-pressure threshold value set in the control system, the control system closes the fourth solenoid valve 25 and stops filling the high-pressure gas storage tank 16 with air.

[0050] During the process of storing gas in the high-pressure gas storage tank 16 , since the first solenoid valve 8 is still in the open state, the first state can exist normally.

[0051] When high-pressure gas tank 16 needs to release energy, the control system closes first solenoid valve 8, second solenoid valve 12, third solenoid valve 15, and fourth solenoid valve 25, leaving only fifth solenoid valve 22 open. Using the pressure within high-pressure gas tank 16, gas is delivered through high-pressure outlet pipe 21 and pressure reducing valve 23 to air turbine 6. Air turbine 6 rotates and drives the generator shaft to generate electricity. During the release process, if the pressure falls below a low-pressure threshold set in the control system, the control system closes fifth solenoid valve 22.

[0052] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A wave energy collection device based on compressed air energy storage, characterized in that: The invention comprises an air turbine assembly and an energy storage assembly, wherein the air turbine assembly comprises the following structure: An installation platform having a cavity structure provided therein; The wave energy pressure storage airbag is fixedly connected to the lower surface of the mounting platform. Its internal air channel is connected to the cavity of the mounting platform, and can change the air pressure in the cavity under the ups and downs of waves; The turbine inlet pipe and the turbine outlet pipe are fixedly connected to the mounting platform. One end of each pipe passes through the mounting platform and is located in the mounting platform cavity, and the other end extends to the outside of the mounting platform. The turbine inlet pipe and the turbine outlet pipe are both sheathed with a restraining tube. The end of the restraining tube away from the mounting platform cavity is equipped with an air turbine device. The turbine inlet pipe is equipped with a first one-way valve, a fifth one-way valve, and a first solenoid valve. Based on the check principle of the first one-way valve, the gas in the turbine inlet pipe flows from the outside of the mounting platform to the mounting platform cavity. Based on the check principle of the fifth one-way valve, the gas in the turbine outlet pipe flows from the mounting platform cavity to the outside of the mounting platform. The first solenoid valve is located at one end of the turbine inlet pipe that is within the mounting platform cavity, and the fifth one-way valve is located in the middle of the turbine inlet pipe. The energy storage assembly includes a low-pressure energy storage assembly and a high-pressure energy storage assembly, wherein the high-pressure energy storage assembly is located on the lower surface of the mounting platform and is immersed in seawater; the low-pressure energy storage assembly is connected to the cavity of the mounting platform through a low-pressure air inlet pipe, the low-pressure energy storage assembly and the high-pressure energy storage assembly are connected through an air compressor, and the high-pressure energy storage assembly is connected to the turbine outlet pipe through a high-pressure air outlet pipe. The connection position of the high-pressure outlet pipe and the turbine outlet pipe is set as point P, which is located between the fifth one-way valve and the turbine outlet pipe outlet. The high-pressure outlet pipe is equipped with a fifth solenoid valve; the high-pressure outlet pipe is located on the lower surface of the mounting platform and is immersed in seawater.

2. A wave energy collection device based on compressed air energy storage according to claim 1, characterized in that: The low-pressure air intake pipe is equipped with a second solenoid valve and a second one-way valve; based on the non-return principle of the second one-way valve, the gas in the low-pressure air intake pipe flows from the cavity of the mounting platform to the low-pressure gas storage tank.

3. A wave energy collection device based on compressed air energy storage according to claim 2, characterized in that: A low-pressure outlet pipe is fixedly connected to the low-pressure gas storage tank, and one end of the low-pressure outlet pipe away from the low-pressure gas storage tank is fixedly connected to the turbine outlet pipe. The connection point between the low-pressure outlet pipe and the turbine outlet pipe is set as point O, then point O is located between the fifth one-way valve and the first solenoid valve, and the low-pressure outlet pipe is equipped with a third solenoid valve.

4. A wave energy collection device based on compressed air energy storage according to claim 3, characterized in that: The air inlet end of the air compressor is fixedly connected and communicated with the low-pressure air tank through a first pressurized pipe, and the first pressurized pipe is equipped with a third one-way valve and a fourth solenoid valve. Based on the check principle of the third one-way valve, the gas flow direction in the first pressurized pipe is: from the low-pressure air tank to the air compressor; the air outlet end of the air compressor is fixedly connected and communicated with the high-pressure air tank through a second pressurized pipe, and the second pressurized pipe is equipped with a fourth one-way valve. Based on the check principle of the fourth one-way valve, the gas flow direction in the second pressurized pipe is: from the air compressor to the high-pressure air tank.

5. The wave energy collection device based on compressed air energy storage according to claim 1, characterized in that: There are gaps between the inner wall of the restraining tube, the outer walls of the turbine air inlet pipe and the turbine air outlet pipe, and the gaps are filled with sealant.

6. A wave energy collection device based on compressed air energy storage according to claim 1, characterized in that: The end surface area of ​​the turbine inlet pipe is larger than the end surface area of ​​the turbine outlet pipe.

Images