Oscillating float type compressed air energy storage method based on wave energy conversion

Abstract

The invention provides an oscillating float type compressed air energy storage method based on wave energy conversion, and belongs to the field of compressed air energy storage. The oscillating floater type compressed air energy storage method is realized based on an oscillating floater type compressed air energy storage device, the oscillating floater type compressed air energy storage device comprises an oscillating floater compressed air structure, an air one-way valve, an air conveying pipeline and an air storage tank, only an oscillating floater is arranged above the sea surface when the oscillating floater type compressed air energy storage device is used, and other parts are arranged below the sea surface. According to the oscillating floater compressed gas structure, the oscillating floater moves up and down under the influence of waves, and the piston at the lower end of the oscillating floater is driven to move through the connecting rod, so that compressed gas passes through the gas one-way valve and is input into the gas storage tank through the gas conveying pipeline; wherein the power in the gas compression process comes from kinetic energy of heaving motion of the oscillating floater under the influence of waves. The low-energy-consumption seawater cooling effect can be achieved, an additional cooling device does not need to be installed, organic fusion of wave energy and the air compression energy storage technology is achieved, and ocean wave energy is effectively utilized.

Description

Technical Field

[0001] The present invention belongs to the field of compressed air energy storage, and relates to an oscillating float type compressed air energy storage method based on wave energy conversion. The oscillating float type compressed air energy storage method can be used for green and low-energy consumption compressed air energy storage. Background Art

[0002] The continuous operation of large-scale enterprise factories is inseparable from a stable energy supply, and the cost of electricity varies significantly in different time periods, with electricity prices during peak hours being much higher than during off-peak hours. Given the huge amount of electricity consumption in large factories, even small price fluctuations can have a significant impact on the overall cost. In order to reduce electricity costs, some companies have adopted a strategy of storing energy during off-peak hours and using electricity during peak hours. Currently, compressed air energy storage technology has become a hot topic in the field of energy storage. It uses the surplus electricity during off-peak hours of the power grid to compress air and store it in high-pressure sealed facilities so that it can be released during peak hours to drive gas turbines or steam turbines to generate electricity.

[0003] Compressed air energy storage technology uses electricity to drive air compressors to compress air during the low-load period of the power grid, and stores it in high-pressure containers; during the peak load period of the power grid, the compressed air is released to drive the steam turbine to generate electricity to meet the power demand. This technology is mainly divided into five stages: compression, gas storage, heat storage, heat recovery and expansion power generation. In the traditional mode, the compression stage consumes a lot of electricity to compress the gas into a high-pressure sealed tank, and the gas needs to be cooled during the gas storage stage to prevent excessive temperature from causing a drop in pressure.

[0004] Driven by the "dual carbon" goal, compressed air energy storage technology has ushered in an opportunity for rapid development. In response to the energy consumption in the compression stage and the cooling problem in the gas storage stage, people have begun to explore the use of ocean wave energy as a low-energy solution with good cooling effect. Ocean wave energy can compress air with low energy consumption, and the marine environment can also naturally provide cooling effects. At present, there have been many research and development results on devices that utilize wave energy.

[0005] In terms of compressed air energy storage, most of the current scholars focus on the "heat exchanger" components in the overall device, and a large amount of electricity is still required to compress and store air. For example, a temperature balance structure and method for a compressed air energy storage heat exchanger (Chinese invention patent, publication number CN118502517A) and a heat exchanger operation control method and system for a compressed air energy storage device (Chinese invention patent, publication number CN118963447A), both of which use traditional electric energy to drive the compressor to achieve gas storage in the gas storage stage. The heat exchanger part designed later can detect the water temperature changes near the components in the compressed air energy storage, and can adjust the working parameters of the water pump in time according to the set temperature to adapt to the changing working conditions, thereby ensuring the efficiency and reliability of the operation. However, whether it is in the compressed air storage stage or the subsequent heat exchange stage, it needs to consume more electricity to achieve normal operation, which causes great energy consumption and goes against the country's green development plan.

[0006] Compared with the traditional air compression energy storage method, the design of the present invention uses the natural energy of waves to compress gas, without the need for additional electricity, which is more environmentally friendly and economical. At the same time, the direct use of seawater for cooling reduces costs and saves the space required for land cooling devices. The core mechanism of the present invention is that under the action of waves, the oscillating float swings up and down, thereby driving the connecting rod to swing vertically to compress the air and store the compressed gas in the gas tank. When electricity demand occurs, the compressed air is released to drive the steam turbine to generate electricity. Summary of the invention

[0007] In view of the problems existing in the prior art, the present invention provides an oscillating float type compressed air energy storage method based on wave energy conversion, which directly converts the kinetic energy of waves into the internal energy of gas and stores it in a high-pressure sealed gas tank. The top of the oscillating float designed by the present invention is provided with an air inlet to guide the gas into the air chamber, and the gas is further compressed by the piston and sent into the gas tank; the gas pipeline is partially placed in a natural marine environment, and the position of the gas pipeline in the sea waves utilizes the natural cooling characteristics of the marine environment, which can achieve a low-energy seawater cooling effect without the need to install additional cooling devices, realize the organic integration of wave energy and air compression energy storage technology, effectively utilize the surrounding wave energy, and realize green and low-energy air compression energy storage. The overall structure consumes the energy of the waves and also has a certain embankment protection function.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is:

[0009] An oscillating float type compressed air energy storage method based on wave energy conversion, wherein the oscillating float type compressed air energy storage method is realized by the oscillating float 1 swinging up and down under the influence of waves, thereby driving its lower end piston to compress the gas in the air chamber. The oscillating float type compressed air energy storage method is realized based on an oscillating float type compressed air energy storage device. When the oscillating float type compressed air energy storage device is used, only the oscillating float 1 part is placed above the sea surface, and the other parts are placed below the sea surface, including four parts: an oscillating float compressed gas structure, a gas one-way valve 7, a gas pipeline 8 and a gas storage tank 9. The oscillating float type compressed air energy storage method is as follows: the oscillating float in the oscillating float compressed air structure swings up and down under the influence of waves, and the piston at the lower end is driven to move by a connecting rod, so that the compressed gas passes through the gas one-way valve 7 and is pumped into the gas storage tank 9 via the gas pipeline 8, wherein the power of the gas compression process comes from the kinetic energy of the oscillating float swinging under the influence of waves.

[0010] The oscillating float compressed gas structure includes an oscillating float compression chamber 13, an oscillating float 1, a connecting rod 2, a piston 3, an air inlet 4 on the top of the oscillating float 1, an air chamber 5 and an air inlet valve 6, and a piston 3; the connecting rod 2 is fixedly connected to the piston 3 at the bottom and fixedly connected to the oscillating float 1 at the top; the piston 3 fits the inner wall of the oscillating float compression chamber 13, and a through hole is provided on the piston 3, and an air inlet valve 6 is provided at the bottom of the through hole. The oscillating float 1, as a main structural component, includes three parts: an upper flat conical structure, a middle regular cylinder, and a lower inverted truncated cone with a side transition arc. The oscillating float 1 is affected by waves to swing up and down, and during its movement, it drives the lower piston 3 through the connecting rod 2 to compress the gas entering the air chamber 5. The top of the upper flat cone structure is provided with an air inlet 4, and the bottom of the inverted truncated cone is provided with a through hole for passing a vent pipe, the top of the vent pipe is slidably connected with the air inlet 4, the bottom of the vent pipe is fixed to the through hole at the top of the oscillating float compression chamber 13, and air is introduced into the air chamber 5 through the vent pipe. The movement of the oscillating float 1 drives the connecting rod 2 to move up and down, thereby pushing the piston 3 connected to its lower end to move.

[0011] The air chamber 5 is used to receive air. When the oscillating float 1 moves upward, it drives the piston 3 upward. At this time, the air inlet valve 6 opens to allow new gas to enter. When the oscillating float 1 moves downward, it drives the piston 3 downward. At this time, the air inlet valve 6 is closed, and the connecting rod 2 of the oscillating float 1 pushes and presses the piston downward to complete the compression of the gas, and the energy of the waves is used to achieve green and low-energy gas storage.

[0012] The gas check valve 7 is used to realize the one-way flow of gas, and the compressed gas in the air chamber 5 is pumped into the gas storage tank 9 through the gas check valve 7 and the gas pipeline 8. The gas check valve 7 only passes gas in one direction to ensure the energy storage performance of air compression, taking into account the repeated movement of the wave water body in the oscillating float, and protects the gas stored in the gas storage tank 9 from overflowing in the reverse direction.

[0013] The gas pipeline 8 is placed in seawater and uses natural seawater for cooling, thereby saving cooling costs and the space occupied by land cooling equipment.

[0014] The gas storage tank 9 can be placed at a designated planned location on land or near the coast for temporary storage of compressed air. It is connected to the gas one-way valve 7 through the gas pipeline 8 and can release compressed air to generate electricity during the low load period of the power grid, thereby meeting the electricity demand.

[0015] Furthermore, the bottom of the inverted truncated cone of the oscillating float 1 is fixedly connected to the connecting rod 2 .

[0016] In the present invention, the size and shape characteristics of the oscillating float 1 will affect its heaving effect after being acted upon by waves. In order to make the final flow rate of compressed air meet the industrial production operation specifications, it is necessary to design and optimize the size and shape characteristics of the oscillating float 1 according to the actual situation. For example, in order to increase the wave receiving area of ​​the float to improve the wave energy absorption rate, the diameter of the oscillating float 1 can be increased, but as its size increases, the overall load will also increase, resulting in a decrease in the movement amplitude of the float. The movement amplitude of the float with damping effect will also increase with the increase of the wave period, and its wave energy conversion efficiency will first increase and then decrease with the increase of the wave period. The movement of the float will produce hysteresis due to the effect of damping, and the greater the damping, the more obvious the hysteresis. In order to obtain a large movement amplitude, the oscillating float 1 should select appropriate mass and other parameters. When its diameter is much smaller than the wave wavelength, the float almost completely heaves with the wave front to achieve a better effect. The size and shape of the oscillating float 1 are also related to the structural strength and environmental adaptability of the device. The survivability of a smaller float in a marine environment will be improved and the movement with the waves will be more flexible.

[0017] The present invention aims to provide an idea for an oscillating float type compressed air energy storage method based on wave energy conversion. As for how the size and shape characteristics of the oscillating float should be set to ensure both the wave response to the float movement and the compression effect of the air, the structural dimensions of the traditional oscillating float wave energy device cannot be simply copied, and should be modified according to actual conditions. As for the layout of the gas pipeline, the position and depth in the sea water and the length requirements of the gas pipeline for cooling should be comprehensively considered in combination with the actual compressed air temperature and the corresponding water temperature in the sea area.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) The present invention uses wave energy to compress air and hydraulic pressure to achieve green and low-energy compressed air energy storage. The reciprocating heaving motion of the oscillating float effectively compresses the gas into the gas storage tank, which has excellent performance and is green and environmentally friendly.

[0020] 2) Since the temperature needs to be kept low during the gas storage phase of compressed air energy storage, the present invention places the gas pipeline in the marine environment. The seawater environment is a natural cooling system. The natural marine environment is used to cool the compressed air, which greatly saves cooling costs and the space occupied by onshore cooling devices. This design not only saves installation space, reduces the purchase and maintenance costs of cooling equipment, but also promotes the green and effective development of compressed air energy storage technology.

[0021] 3) The movement of the oscillating float of the present invention can effectively consume the energy of seawater, and can absorb the energy of seawater while compressing the gas to store energy. That is, the present invention absorbs the energy of waves and uses it to compress gas, which can effectively weaken the energy of the waves themselves and achieve the role of protecting the embankment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1 is a schematic diagram of a three-dimensional structure of the present invention;

[0023] FIG2 is a front view of the present invention;

[0024] FIG3 is a rear view of the present invention;

[0025] Fig. 4 is a left side view of the present invention;

[0026] Fig. 5 is a right side view of the present invention;

[0027] FIG6 is a top view of the present invention;

[0028] FIG7 is a bottom view of the present invention;

[0029] Figure 8 It is a schematic diagram of the overall two-dimensional structure of an oscillating float type compressed air energy storage method based on wave energy conversion of the present invention;

[0030] Fig. 9 It is a schematic diagram of the internal structure of a gas one-way valve in an oscillating float type compressed air energy storage method based on wave energy conversion of the present invention;

[0031] In the figure: 1 oscillating float; 2 connecting rod; 3 piston; 4 air inlet; 5 air chamber; 6 air inlet valve; 7 gas check valve; 8 gas pipeline; 9 gas storage tank; 10 valve body; 11 valve core, 12 spring; 13 oscillating float compression chamber. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings.

[0033] An oscillating float type compressed air energy storage method based on wave energy conversion, the oscillating float type compressed air energy storage method is realized by the oscillating float 1 swinging up and down under the influence of waves, thereby driving its lower end piston to compress the gas in the air chamber. The oscillating float type compressed air energy storage method is realized based on an oscillating float type compressed air energy storage device. When the oscillating float type compressed air energy storage device is used, only the oscillating float 1 part is placed above the sea surface, and the other parts are placed below the sea surface, including four parts: an oscillating float compressed gas structure, a gas one-way valve 7, a gas pipeline 8 and a gas storage tank 9. The oscillating float type compressed air energy storage method is as follows: the oscillating float in the oscillating float compressed gas structure swings up and down under the influence of waves, and the piston at the lower end is driven to move by a connecting rod, so that the compressed gas passes through the gas one-way valve 7 and is pumped into the gas storage tank 9 through the gas pipeline 8, wherein the power of the gas compression process comes from the kinetic energy of the oscillating float swinging under the influence of waves. On the basis of the traditional oscillating float wave energy device, the connecting rod 2 drives the piston 3 at the lower end to compress the gas in the air chamber 5, mainly utilizing the influence of sea waves on the movement of the oscillating float to compress the gas with low energy consumption, and then injects the gas into the high-pressure sealed gas storage tank 9 through the gas one-way valve 7.

[0034] The oscillating float compressed gas structure includes an oscillating float compression chamber 13, an oscillating float 1, a connecting rod 2, a piston 3, an air inlet 4 on the top of the oscillating float 1, an air chamber 5 and an air inlet valve 6, and a piston 3; the connecting rod 2 is fixedly connected to the piston 3 at the bottom and fixedly connected to the oscillating float 1 at the top; the piston 3 fits the inner wall of the oscillating float compression chamber 13, and a through hole is provided on the piston 3, and an air inlet valve 6 is provided at the bottom of the through hole. The oscillating float 1, as a main structural component, includes three parts: an upper flat conical structure, a middle regular cylinder, and a lower inverted truncated cone with a side transition arc. The oscillating float 1 is affected by waves to swing up and down, and during its movement, it drives the lower piston 3 through the connecting rod 2 to compress the gas entering the air chamber 5. The top of the upper flat cone structure is provided with an air inlet 4, and the bottom of the inverted truncated cone is provided with a through hole for passing a vent pipe. The top of the vent pipe is slidably connected to the air inlet 4, and the bottom of the vent pipe is fixed to the through hole at the top of the oscillation float compression chamber 13, and air is introduced into the air chamber 5 through the vent pipe. The movement of the oscillator 1 drives the connecting rod 2 to move up and down, thereby pushing the piston 3 connected to its lower end to move.

[0035] The air chamber 5 is used to receive air. When the oscillating float 1 moves upward, it drives the piston 3 upward. At this time, the air inlet valve 6 opens to allow new gas to enter. When the oscillating float 1 moves downward, it drives the piston 3 downward. At this time, the air inlet valve 6 is closed, and the connecting rod 2 of the oscillating float 1 pushes and presses the piston downward to complete the compression of the gas, and the energy of the waves is used to achieve green and low-energy gas storage.

[0036] In this embodiment, in order to cool down the compressed air, the gas pipeline 8 is arranged in the seawater for cooling to prevent the pressure from dropping due to excessive temperature. It is suitable for offshore embankments in coastal areas and sea areas near ports and docks. While storing compressed air energy in a green and low-energy manner, it can also reduce cooling costs and the space occupied by cooling equipment, and can play a certain protective role on the embankment after weakening wave energy.

[0037] In this embodiment, the gas one-way valve 7 can be made of purchased standard parts, and its internal structure includes a valve body 10, a valve core 11 and a spring 12. By observing the entire gas one-way valve 7, it can be seen that after the gas is compressed out from the gas outlet, it enters the valve core 11 inside the valve body 10 from its left side. The continuous influx of gas will push and compress the spring 12 in the valve core 11, thereby clearing the channel for the gas to move forward unidirectionally, thereby realizing the unidirectional flow of the gas.

[0038] The working process of an oscillating float type compressed air energy storage method based on wave energy conversion is as follows:

[0039] During operation, the oscillating float 1 is affected by external waves and moves up and down. The movement of the float will push the piston 3 at the lower end to move along with the existence of the connecting rod 2. The air inlet 4 at the upper end of the float is used for the smooth entry of air:

[0040] When the float moves upward, the air inlet valve 6 in the air chamber 5 opens to facilitate the entry of gas into the air chamber 5;

[0041] When the float moves downward, the air inlet valve 6 in the air chamber will be closed, wherein the piston 3 driven by the lower end of the connecting rod 2 is a disc structure extending all the way to the wall around the device and closely connected to the wall, and the air inlet valve 6 is a part of the piston 3, and is an open movable part on the piston 3. When the float moves downward, the air inlet valve 6 will be closed, and the piston 3 inside will compress the gas in the air chamber 5 and pump it into the gas storage tank 9 through the gas one-way valve 7 and the gas pipeline 8. The gas storage tank 9 temporarily stores the high-pressure gas, and when the power grid is in peak period, the stored compressed air can be released to generate electricity, thereby meeting the demand for electricity.

[0042] The above-described embodiments merely express the implementation methods of the present invention, but they should not be understood as limiting the scope of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. An oscillating float type compressed air energy storage method based on wave energy conversion, characterized in that: The oscillating float type compressed air energy storage method is implemented based on an oscillating float type compressed air energy storage device, comprising an oscillating float compressed gas structure, a gas one-way valve (7), a gas transmission pipeline (8) and a gas storage tank (9). When in use, only the oscillating float (1) is placed above the sea surface, and the other parts are placed below the sea surface. The oscillating float type compressed air energy storage method comprises: the oscillating float (1) is affected by waves to swing up and down, and the piston at the lower end is driven by a connecting rod to move to compress the gas in the air chamber of the oscillating float compressed gas structure, so that the compressed gas passes through the gas one-way valve (7) and is input into the gas storage tank (9) via the gas transmission pipeline (8).

2. The oscillating float type compressed air energy storage method based on wave energy conversion according to claim 1 is characterized in that: The oscillating float compressed gas structure comprises an oscillating float compression chamber (13), an oscillating float (1), a connecting rod (2), a piston (3), an air inlet (4) at the top of the oscillating float (1), an air chamber (5) and an air inlet valve (6), and a piston (3); the bottom of the connecting rod (2) is fixedly connected to the piston (3), and the top is fixedly connected to the oscillating float (1); the piston (3) is in contact with the inner wall surface of the oscillating float compression chamber (13), and a through hole is provided on the piston (3), and an air inlet valve (6) is provided at the bottom surface of the through hole.

3. The oscillating float type compressed air energy storage method based on wave energy conversion according to claim 2 is characterized in that: The oscillating float (1) is a main structural component, comprising three parts: an upper flat conical structure, a middle regular cylinder, and a lower inverted truncated cone with a side transition arc; an air inlet (4) is provided at the top of the upper flat conical structure, and a through hole for passing a vent pipe is provided at the bottom of the inverted truncated cone; the top of the vent pipe is slidably connected to the air inlet (4), and the bottom of the vent pipe is fixed to the through hole at the top of the oscillating float compression chamber (13), and air is introduced into the air chamber (5) through the vent pipe.

4. The oscillating float type compressed air energy storage method based on wave energy conversion according to claim 2 is characterized in that: The air chamber (5) is used to receive air. When the oscillating float (1) moves upward, it drives the piston (3) upward. At this time, the air inlet valve (6) opens to allow new gas to enter. When the oscillating float (1) moves downward, it drives the piston (3) downward. At this time, the air inlet valve (6) closes. The connecting rod (2) of the oscillating float (1) pushes and presses the piston (3) downward to complete the compression of the gas, and the energy of the waves is used to achieve green and low-energy gas storage.

5. The oscillating float type compressed air energy storage method based on wave energy conversion according to claim 1 is characterized in that: The gas one-way valve (7) is used to realize one-way flow of gas. The compressed gas in the gas chamber (5) is input into the gas storage tank (9) via the gas one-way valve (7) and the gas pipeline (8).

6. The oscillating float type compressed air energy storage method based on wave energy conversion according to claim 1 is characterized in that: The gas transmission pipeline (8) is placed in seawater and uses natural seawater for cooling.

7. The oscillating float type compressed air energy storage method based on wave energy conversion according to claim 1 is characterized in that: The bottom of the inverted truncated cone of the oscillating float (1) is fixedly connected to the connecting rod (2).

8. The oscillating float type compressed air energy storage method based on wave energy conversion according to claim 1 is characterized in that: The gas storage tank (9) is placed at a designated planned location on land or near the coast and is used to store compressed air. During the off-load period of the power grid, the compressed air is released to generate electricity to meet the power demand.

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