Power generation and energy storage method based on wave energy and application

Abstract

The invention discloses a power generation and energy storage method based on wave energy and application, and belongs to the technical field of wave energy power generation. The power generation and energy storage method is characterized by comprising the following steps that S1, a fixing frame is arranged at the bottom of a power generation device, a pump is installed in a floater, and then a water storage tank and the floater are connected with the fixing frame; s2, the floater reciprocates up and down under the action of waves to drive a top plate and a bottom plate of the pump to generate relative operation, and seawater is sucked into a cavity of the pump and pumped into a water storage tank; s3, the seawater forms a high-level water head in the water storage tank for energy storage; and S4, the valve is opened, the high-level water head drives a water-turbine generator set located below the high-level water head in the water storage tank to generate electricity, and generated electric energy is stored through an energy storage battery electrically connected with the water-turbine generator set. According to the invention, gravitational potential energy of seawater can be stored, and electric energy generated after power generation can be stored in time so as to adapt to high-efficiency energy storage requirements in different sea area environments.

Description

Technical Field

[0001] The present invention relates to the technical field of wave energy power generation, and particularly to a power generation and energy storage method and application based on wave energy. Background Art

[0002] Wave energy generates energy through the rising and falling motion of ocean waves. This energy utilizes the wave power generated by the wind acting on the sea surface. Wave energy devices are designed to capture and convert this kinetic energy into electrical energy and can be installed near the coast or in the open ocean.

[0003] The installed capacity of wave energy devices in China can reach the hundred-kilowatt level. Generally speaking, wave energy power generation devices in China have gradually developed from nearshore, low-power, and single-type to floating, high-power, and array-type. However, from the general situation of sea trials, the conversion efficiency of power generation devices and their reliability, stability, and power characteristics under actual sea conditions need to be further improved.

[0004] Chinese patent document with publication number CN215633496 U and publication date of January 25, 2022, discloses a water tower type wave energy power generation device, which is characterized in that it includes: an underwater piston unit, a piston motion driving unit, and a high-position energy storage power generation unit; the high-position energy storage power generation unit includes a high-position water tower, a water turbine generator set, a water inlet pipe, and a return pipe; the high-position water tower introduces the high-potential water body in the high-position water tower into the water turbine generator set for power generation through the water inlet pipe, and the drainage end of the water turbine generator set is communicated with the sea body through the return pipe; the piston motion driving unit includes a power take-off floating cylinder; the power take-off floating cylinder floats on the water surface; the underwater piston unit includes a piston pump cylinder body, an outer sleeve of the piston pump cylinder body is provided with a piston pump support floating cylinder, and a plurality of piston pump fixing cables are arranged on the outer surface of the piston pump cylinder body, and the other ends of the piston pump fixing cables are fixed to the pile foundation of the seabed, so that the piston pump cylinder body is suspended and fixed in the calm water area below the sea level; the piston pump cylinder body has a structure with an open bottom and a sealed top; a piston is installed in the piston pump cylinder body in a liftable and slidable sealed manner, and the piston divides the piston pump cylinder body into a piston pump upper chamber and a piston pump lower chamber; wherein, the bottom of the piston pump lower chamber is communicated with the sea to form an open lower chamber; a one-way water inlet valve is opened on the piston, and the piston pump upper chamber is communicated with the high-position water tower through a lifting water pipe; a one-way water outlet valve is installed at one end of the lifting water pipe; the axis of the piston is fixed to one end of a piston lifting cable; after the other end of the piston lifting cable passes through the top cover of the piston pump cylinder body in a sealed manner, it is coaxially installed on the axis of the power take-off floating cylinder; when the power take-off floating cylinder floats or sinks, the piston is driven to move up and down through the piston lifting cable.

[0005] The water tower type wave energy power generation device disclosed in this patent document has most of its facilities arranged in the static water area below the sea surface, avoiding the influence of wind and waves, greatly enhancing the safety and stability, and aggregating the scattered wave energy through a piston pump and a high-position water tower to achieve power generation. However, after the power generation device generates electricity, it cannot store the electric energy in time and cannot meet the high-efficiency energy storage requirements in different sea area environments. Summary of the Invention

[0006] In order to overcome the defects of the above-mentioned prior art, the present invention provides a power generation and energy storage method and application based on wave energy. The present invention can not only store the gravitational potential energy of seawater, but also store the electric energy generated after power generation in time to meet the high-efficiency energy storage requirements in different sea area environments.

[0007] The present invention is realized by the following technical solutions: A power generation and energy storage method based on wave energy, characterized by comprising the following steps: S1. A fixing frame is arranged at the bottom of the power generation device, a pump is installed in a float, and then a water storage tank and the float are respectively connected to the fixing frame; S2. The float makes an up-and-down reciprocating motion under the action of waves, driving the top plate and the bottom plate of the pump to perform relative operation, sucking seawater into the cavity of the pump, and pumping it into the water storage tank; S3. The seawater forms a high-level water head in the water storage tank for energy storage; S4. Open the valve, and the high-level water head drives the water turbine generator set located below the high-level water head inside the water storage tank to generate electricity, and the generated electric energy is stored through an energy storage battery electrically connected to the water turbine generator set.

[0008] In the step S1, a valve is arranged in the water storage tank, and the valve divides the water storage tank into an upper water storage cavity for storing seawater and a lower installation cavity for installing a water turbine generator set and an energy storage battery.

[0009] In the step S1, the pump is a diaphragm pump.

[0010] In the step S1, installing the pump in the float means installing the diaphragm pump in the float. The diaphragm pump includes a top plate, a flexible diaphragm and a bottom plate. The upper end of the flexible diaphragm is connected to the top plate, the lower end of the flexible diaphragm is connected to the bottom plate, the top plate, the flexible diaphragm and the bottom plate enclose a cavity, a water inlet pipe and a water outlet pipe are fixedly penetrated through the top plate, a water inlet check valve is installed on the water inlet pipe, and a water outlet check valve is installed on the water outlet pipe.

[0011] The water inlet end of the water inlet pipe penetrates through the float and extends into the sea, and the water outlet end of the water outlet pipe penetrates through the float and communicates with the upper part of the water storage tank.

[0012] In the step S2, the reciprocating up-and-down movement of the float under the action of the waves means that the float floats under the action of the waves at the wave crest section and falls under the action of the waves at the wave trough section.

[0013] In the step S2, sucking seawater into the chamber of the pump means that the float floats upward, stretching the flexible diaphragm in the diaphragm pump, increasing the chamber volume, opening the intake check valve on the intake pipe, closing the discharge check valve on the discharge pipe, and sucking seawater into the chamber of the diaphragm pump through the intake pipe.

[0014] In the step S2, pumping into the water storage tank means that the float falls, compressing the flexible diaphragm in the diaphragm pump, reducing the chamber volume, closing the intake check valve on the intake pipe, opening the discharge check valve on the discharge pipe, and pumping the seawater in the chamber into the water storage tank through the discharge pipe.

[0015] In the step S3, energy storage means that the valve in the water storage tank is in the closed state, and the seawater is stored in the water storage tank in the form of gravitational potential energy.

[0016] In the step S4, the power generation of the water turbine generator set includes continuous power generation and intermittent power generation.

[0017] The continuous power generation means that when generating power, the valve is opened, and the high water head formed by pumping seawater into the water storage tank through the diaphragm pump continuously falls, driving the water turbine generator set to generate power.

[0018] The intermittent power generation means that the high water head formed by pumping seawater into the water storage tank through the diaphragm pump is first stored and collected in the water storage chamber of the water storage tank. When generating power, the valve is opened, and the stored high water head is released to drive the water turbine generator set to generate power.

[0019] An application of a power generation and energy storage method based on wave energy, characterized in that: when transmitting power externally, the maximum transmitted power is the sum of the energy stored in the energy storage battery and the potential energy stored in the seawater in the water storage tank.

[0020] An application of a power generation and energy storage method based on wave energy, characterized in that: when transmitting power externally, The maximum transmitted power is the sum of the discharge power of the energy storage battery and the power of the water turbine generator set.

[0021] The beneficial effects of the present invention are mainly manifested in the following aspects: 1. In the present invention, in step S1, a fixing frame is provided at the bottom of the power generation device. The pump is installed inside the float, and then the water storage tank and the float are respectively connected to the fixing frame. 2. Under the action of waves, the float moves up and down reciprocally, driving the top plate and the bottom plate of the pump to move relatively, sucking seawater into the cavity of the pump, and pumping it into the water storage tank. 3. The seawater forms a high-level water head in the water storage tank for energy storage. 4. Open the valve, and the high-level water head drives the water turbine generator set located below the high-level water head inside the water storage tank to generate electricity. The generated electric energy is stored through the energy storage battery electrically connected to the water turbine generator set. Compared with the prior art, it can not only store the gravitational potential energy of seawater, but also store the generated electric energy in time to meet the high-efficiency energy storage requirements in different sea area environments.

[0022] 2. In the present invention, in step S1, a valve is provided in the water storage tank. The valve divides the water storage tank into an upper water storage cavity for storing seawater and a lower installation cavity for installing the water turbine generator set and the energy storage battery. By providing a valve in the water storage tank, the power generation time can be flexibly selected. When power generation is required, just open the valve, and the stored high-level water head can be released to drive the water turbine generator set to generate electricity.

[0023] 3. In the present invention, the water inlet end of the water inlet pipe penetrates through the float and extends into the sea, and the water outlet end of the water outlet pipe penetrates through the float and communicates with the upper part of the water storage tank. The structure is simple, which is convenient for the diaphragm pump to quickly suck in and pump out seawater.

[0024] 4. In the present invention, in step S2, the float moving up and down reciprocally under the action of waves means that the float floats under the action of waves at the wave crest section and falls under the action of waves at the wave trough section. The float can conveniently collect wave energy and convert wave energy into mechanical energy. 5. In the present invention, in step S2, sucking seawater into the cavity of the pump means that the float floats up, stretching the flexible diaphragm in the diaphragm pump, increasing the cavity volume, opening the water inlet check valve on the water inlet pipe, and closing the water outlet check valve on the water outlet pipe. Seawater is sucked into the cavity of the diaphragm pump through the water inlet pipe. Since the pump is located inside the float, the reliability of the pump can be guaranteed, and thus the stable suction of seawater can be ensured.

[0025] 6. In the present invention, in step S2, pumping into the water storage tank means that the float falls, compressing the flexible diaphragm in the diaphragm pump, reducing the cavity volume, closing the water inlet check valve on the water inlet pipe, and opening the water outlet check valve on the water outlet pipe. The seawater in the cavity is pumped into the water storage tank through the water outlet pipe. The pump is located inside the float, ensuring the stability of the pump during use, and thus the stable pumping of seawater can be ensured.

[0026] VII. In the present invention, in step S3, energy storage means that the valve in the water storage tank is in a closed state, and seawater is stored in the water storage tank in the form of gravitational potential energy. While the energy storage battery stores electrical energy, seawater can be stored in the water storage tank in the form of gravitational potential energy. Compared with the prior art, different forms of energy can be stored.

[0027] VIII. In the present invention, when transmitting power externally, the maximum power transmission energy is the sum of the energy stored in the energy storage battery and the potential energy stored in the seawater in the water storage tank; the maximum power transmission power is the sum of the discharge power of the energy storage battery and the power of the water turbine generator set. Compared with the prior art, the utilization rate of wave energy can be effectively improved, and the stability of power generation and energy storage can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be further specifically described below in conjunction with the specification drawings and specific embodiments, where: Figure 1 is a flow block diagram of the present invention; Figure 2 is a structural schematic diagram of the power generation device of the present invention; Figure 3 is a structural schematic diagram of the diaphragm pump of the present invention; Reference numerals in the figures: 1, float; 2, water storage tank; 3, water turbine generator set; 4, fixed frame; 5, diaphragm pump; 6, water inlet pipe; 7, water outlet pipe; 8, inlet check valve; 9, outlet check valve; 10, chamber; 11, top plate; 12, flexible diaphragm; 13, bottom plate; 14, valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Embodiment 1 See Figure 1 , a power generation and energy storage method based on wave energy, comprising the following steps: S1. A fixed frame 4 is arranged at the bottom of the power generation device, the pump is installed in the float 1, and then the water storage tank 2 and the float 1 are respectively connected to the fixed frame 4; S2. The float 1 makes an up-and-down reciprocating motion under the action of waves, driving the top plate 11 and the bottom plate 13 of the pump to move relatively, sucking seawater into the cavity of the pump, and pumping it into the water storage tank 2; S3. Seawater forms a high water head in the water storage tank 2 for energy storage; S4. The valve 14 is opened, and the high water head drives the water turbine generator set 3 located below the high water head inside the water storage tank 2 to generate electricity, and the generated electric energy is stored through an energy storage battery electrically connected to the water turbine generator set 3.

[0030] This embodiment is the most basic implementation method. S1: A fixing frame 4 is arranged at the bottom of the power generation device. The pump is installed in the float 1, and then the water storage tank 2 and the float 1 are respectively connected to the fixing frame 4; S2: The float 1 makes an up-and-down reciprocating motion under the action of the waves, driving the top plate 11 and the bottom plate 13 of the pump to produce relative motion, sucking seawater into the cavity of the pump, and pumping it into the water storage tank 2; S3: The seawater forms a high-level water head in the water storage tank 2 for energy storage; S4: Open the valve 14, and the high-level water head drives the water turbine generator set 3 located below the high-level water head inside the water storage tank 2 to generate electricity, and the generated electric energy is stored through the energy storage battery electrically connected to the water turbine generator set 3. Compared with the prior art, it can not only store the gravitational potential energy of seawater, but also store the generated electric energy in time to meet the high-efficiency energy storage requirements in different sea area environments.

[0031] Embodiment 2 See Figure 1 - Figure 2 , a wave energy-based power generation and energy storage method, comprising the following steps: S1: A fixing frame 4 is arranged at the bottom of the power generation device. The pump is installed in the float 1, and then the water storage tank 2 and the float 1 are respectively connected to the fixing frame 4; S2: The float 1 makes an up-and-down reciprocating motion under the action of the waves, driving the top plate 11 and the bottom plate 13 of the pump to produce relative motion, sucking seawater into the cavity of the pump, and pumping it into the water storage tank 2; S3: The seawater forms a high-level water head in the water storage tank 2 for energy storage; S4: Open the valve 14, and the high-level water head drives the water turbine generator set 3 located below the high-level water head inside the water storage tank 2 to generate electricity, and the generated electric energy is stored through the energy storage battery electrically connected to the water turbine generator set 3.

[0032] Preferably, in step S1, a valve 14 is arranged in the water storage tank 2, and the valve 14 divides the water storage tank 2 into an upper water storage cavity for storing seawater and a lower installation cavity for installing the water turbine generator set 3 and the energy storage battery.

[0033] This embodiment is a preferred implementation method. In step S1, a valve 14 is arranged in the water storage tank 2, and the valve 14 divides the water storage tank 2 into an upper water storage cavity for storing seawater and a lower installation cavity for installing the water turbine generator set 3 and the energy storage battery. By arranging the valve 14 in the water storage tank 2, the power generation time can be flexibly selected. When power generation is required, just open the valve 14, and the stored high-level water head can be released to drive the water turbine generator set 3 to generate electricity.

[0034] Embodiment 3 See Figure 1 - Figure 3 , a wave energy-based power generation and energy storage method, comprising the following steps: S1. Set up a fixed frame 4 at the bottom of the power generation device, install the pump inside the float 1, and then connect the water storage tank 2 and the float 1 to the fixed frame 4 respectively; S2. Under the action of waves, the float 1 makes an up-and-down reciprocating motion, driving the top plate 11 and the bottom plate 13 of the pump to move relatively, sucking seawater into the cavity of the pump, and pumping it into the water storage tank 2; S3. The seawater forms a high-level water head in the water storage tank 2 for energy storage; S4. Open the valve 14, and the high-level water head drives the water turbine generator set 3 inside the water storage tank 2 below the high-level water head to generate electricity, and the generated electric energy is stored through the energy storage battery electrically connected to the water turbine generator set 3.

[0035] In the step S1, a valve 14 is arranged in the water storage tank 2, and the valve 14 divides the water storage tank 2 into a water storage cavity for storing seawater in the upper part and an installation cavity for installing the water turbine generator set 3 and the energy storage battery in the lower part.

[0036] In the step S1, the pump is a diaphragm pump 5.

[0037] In the step S1, installing the pump inside the float 1 means installing the diaphragm pump 5 inside the float 1. The diaphragm pump 5 includes a top plate 11, a flexible diaphragm 12 and a bottom plate 13. The upper end of the flexible diaphragm 12 is connected to the top plate 11, the lower end of the flexible diaphragm 12 is connected to the bottom plate 13, and the top plate 11, the flexible diaphragm 12 and the bottom plate 13 enclose a chamber 10. A water inlet pipe 6 and a water outlet pipe 7 are fixedly penetrated through the top plate 11. A water inlet check valve 8 is installed on the water inlet pipe 6, and a water outlet check valve 9 is installed on the water outlet pipe 7.

[0038] The water inlet end of the water inlet pipe 6 penetrates through the float 1 and extends into the sea, and the water outlet end of the water outlet pipe 7 penetrates through the float 1 and communicates with the upper part of the water storage tank 2.

[0039] In the step S2, the float 1 making an up-and-down reciprocating motion under the action of waves means that the float 1 floats under the action of waves in the wave crest section and falls under the action of waves in the wave trough section.

[0040] This embodiment is another preferred embodiment. The water inlet end of the water inlet pipe 6 penetrates through the float 1 and extends into the sea, and the water outlet end of the water outlet pipe 7 penetrates through the float 1 and communicates with the upper part of the water storage tank 2. The structure is simple, which is convenient for the diaphragm pump 5 to quickly suck in and pump out seawater.

[0041] In the step S2, the float 1 making an up-and-down reciprocating motion under the action of waves means that the float 1 floats under the action of waves in the wave crest section and falls under the action of waves in the wave trough section. The float 1 can conveniently collect wave energy and convert wave energy into mechanical energy. Embodiment 4 See Figure 1 - Figure 3, a power generation and energy storage method based on wave energy, comprising the following steps: S1. A fixing frame 4 is arranged at the bottom of the power generation device, a pump is installed in the float 1, and then the water storage tank 2 and the float 1 are respectively connected to the fixing frame 4; S2. The float 1 makes an up-and-down reciprocating motion under the action of the wave, driving the top plate 11 and the bottom plate 13 of the pump to move relatively, sucking seawater into the cavity of the pump, and pumping it into the water storage tank 2; S3. The seawater forms a high-level water head in the water storage tank 2 for energy storage; S4. Open the valve 14, and the high-level water head drives the water turbine generator set 3 located below the high-level water head inside the water storage tank 2 to generate electricity, and the generated electric energy is stored through the energy storage battery electrically connected to the water turbine generator set 3.

[0042] In the step S1, a valve 14 is arranged in the water storage tank 2, and the valve 14 divides the water storage tank 2 into a water storage cavity for storing seawater in the upper part and an installation cavity for installing the water turbine generator set 3 and the energy storage battery in the lower part.

[0043] In the step S1, the pump is a diaphragm pump 5.

[0044] Further preferably, in the step S1, installing the pump in the float 1 means installing the diaphragm pump 5 in the float 1. The diaphragm pump 5 includes a top plate 11, a flexible diaphragm 12 and a bottom plate 13. The upper end of the flexible diaphragm 12 is connected to the top plate 11, the lower end of the flexible diaphragm 12 is connected to the bottom plate 13, and the top plate 11, the flexible diaphragm 12 and the bottom plate 13 enclose a cavity 10. A water inlet pipe 6 and a water outlet pipe 7 are fixedly penetrated through the top plate 11. A water inlet check valve 8 is installed on the water inlet pipe 6, and a water outlet check valve 9 is installed on the water outlet pipe 7.

[0045] The water inlet end of the water inlet pipe 6 penetrates through the float 1 and extends into the sea, and the water outlet end of the water outlet pipe 7 penetrates through the float 1 and communicates with the upper part of the water storage tank 2.

[0046] In the step S2, the float 1 making an up-and-down reciprocating motion under the action of the wave means that the float 1 floats under the action of the wave in the wave crest section and falls under the action of the wave in the wave trough section.

[0047] In the step S2, sucking seawater into the cavity 10 of the pump means that the float 1 floats, stretching the flexible diaphragm 12 in the diaphragm pump 5, increasing the volume of the cavity 10, opening the water inlet check valve 8 on the water inlet pipe 6, closing the water outlet check valve 9 on the water outlet pipe 7, and sucking seawater into the cavity 10 of the diaphragm pump 5 through the water inlet pipe 6.

[0048] This embodiment is another preferred embodiment. In step S2, sucking seawater into the chamber 10 of the pump means that the float 1 floats upward, stretching the flexible diaphragm 12 in the diaphragm pump 5, increasing the volume of the chamber 10, opening the inlet check valve 8 on the water inlet pipe 6, closing the outlet check valve 9 on the water outlet pipe 7, and sucking seawater into the chamber 10 of the diaphragm pump 5 through the water inlet pipe 6. Since the pump is located inside the float 1, the reliability of the pump can be ensured, and thus the stable suction of seawater can be guaranteed.

[0049] Embodiment 5 See Figure 1 - Figure 3 , a power generation and energy storage method based on wave energy, comprising the following steps: S1. Set up a fixing frame 4 at the bottom of the power generation device, install the pump inside the float 1, and then connect the water storage tank 2 and the float 1 to the fixing frame 4 respectively; S2. The float 1 makes an up-and-down reciprocating motion under the action of waves, driving the top plate 11 and the bottom plate 13 of the pump to move relatively, sucking seawater into the cavity of the pump, and pumping it into the water storage tank 2; S3. The seawater forms a high-level water head in the water storage tank 2 for energy storage; S4. Open the valve 14, and the high-level water head drives the water turbine generator set 3 inside the water storage tank 2 below the high-level water head to generate electricity, and the generated electric energy is stored through the energy storage battery electrically connected to the water turbine generator set 3.

[0050] In the above step S1, a valve 14 is provided in the water storage tank 2, and the valve 14 divides the water storage tank 2 into an upper water storage cavity for storing seawater and a lower installation cavity for installing the water turbine generator set 3 and the energy storage battery.

[0051] In the above step S1, the pump is a diaphragm pump 5.

[0052] In the above step S1, installing the pump inside the float 1 means installing the diaphragm pump 5 inside the float 1. The diaphragm pump 5 includes a top plate 11, a flexible diaphragm 12, and a bottom plate 13. The upper end of the flexible diaphragm 12 is connected to the top plate 11, the lower end of the flexible diaphragm 12 is connected to the bottom plate 13, the top plate 11, the flexible diaphragm 12, and the bottom plate 13 enclose a chamber 10, and a water inlet pipe 6 and a water outlet pipe 7 are fixedly penetrated through the top plate 11. An inlet check valve 8 is installed on the water inlet pipe 6, and an outlet check valve 9 is installed on the water outlet pipe 7.

[0053] The water inlet end of the water inlet pipe 6 penetrates through the float 1 and extends into the sea, and the water outlet end of the water outlet pipe 7 penetrates through the float 1 and communicates with the upper part of the water storage tank 2.

[0054] In the above step S2, the float 1 making an up-and-down reciprocating motion under the action of waves means that the float 1 floats upward under the action of waves in the wave crest section and falls under the action of waves in the wave trough section.

[0055] In step S2, sucking seawater into chamber 10 of the seawater suction pump means that the float 1 floats upward, stretching the flexible diaphragm 12 in the diaphragm pump 5, increasing the volume of chamber 10, opening the intake check valve 8 on the water inlet pipe 6, closing the outlet check valve 9 on the water outlet pipe 7, and sucking seawater into chamber 10 of the diaphragm pump 5 through the water inlet pipe 6.

[0056] In step S2, pumping into the water storage tank 2 means that the float 1 drops, compressing the flexible diaphragm 12 in the diaphragm pump 5, reducing the volume of chamber 10, closing the intake check valve 8 on the water inlet pipe 6, opening the outlet check valve 9 on the water outlet pipe 7, and pumping the seawater in chamber 10 into the water storage tank 2 through the water outlet pipe 7.

[0057] This embodiment is another preferred embodiment. In step S2, pumping into the water storage tank 2 means that the float 1 drops, compressing the flexible diaphragm 12 in the diaphragm pump 5, reducing the volume of chamber 10, closing the intake check valve 8 on the water inlet pipe 6, opening the outlet check valve 9 on the water outlet pipe 7, and pumping the seawater in chamber 10 into the water storage tank 2 through the water outlet pipe 7. The pump is located inside the float 1, ensuring the stable operation of the pump, and thus enabling the stable pumping of seawater.

[0058] Embodiment 6 See Figure 1 - Figure 3 , a power generation and energy storage method based on wave energy, comprising the following steps: S1. Set up a fixing frame 4 at the bottom of the power generation device, install the pump inside the float 1, and then connect the water storage tank 2 and the float 1 to the fixing frame 4 respectively; S2. The float 1 makes an up-and-down reciprocating motion under the action of waves, driving the top plate 11 and the bottom plate 13 of the pump to move relatively, sucking seawater into the cavity of the pump, and pumping it into the water storage tank 2; S3. The seawater forms a high-level water head in the water storage tank 2 for energy storage; S4. Open the valve 14, and the high-level water head drives the water turbine generator set 3 located below the high-level water head inside the water storage tank 2 to generate electricity, and the generated electric energy is stored through the energy storage battery electrically connected to the water turbine generator set 3.

[0059] In step S1, a valve 14 is provided in the water storage tank 2, and the valve 14 divides the water storage tank 2 into an upper water storage cavity for storing seawater and a lower installation cavity for installing the water turbine generator set 3 and the energy storage battery.

[0060] In step S1, the pump is a diaphragm pump 5.

[0061] In the step S1, installing the pump inside the float 1 means installing the diaphragm pump 5 inside the float 1. The diaphragm pump 5 includes a top plate 11, a flexible diaphragm 12, and a bottom plate 13. The upper end of the flexible diaphragm 12 is connected to the top plate 11, and the lower end of the flexible diaphragm 12 is connected to the bottom plate 13. The top plate 11, the flexible diaphragm 12, and the bottom plate 13 enclose a chamber 10. A water inlet pipe 6 and a water outlet pipe 7 are fixedly penetrated through the top plate 11. A water inlet check valve 8 is installed on the water inlet pipe 6, and a water outlet check valve 9 is installed on the water outlet pipe 7.

[0062] The water inlet end of the water inlet pipe 6 penetrates through the float 1 and extends into the sea, and the water outlet end of the water outlet pipe 7 penetrates through the float 1 and communicates with the upper part of the water storage tank 2.

[0063] In the step S2, the float 1 making an up-and-down reciprocating motion under the action of the wave means that the float 1 floats under the action of the wave at the wave crest section and falls under the action of the wave at the wave trough section.

[0064] In the step S2, sucking seawater into the chamber 10 of the pump means that the float 1 floats, stretches the flexible diaphragm 12 in the diaphragm pump 5, increases the volume of the chamber 10, the water inlet check valve 8 on the water inlet pipe 6 opens, and the water outlet check valve 9 on the water outlet pipe 7 closes, and sucks seawater into the chamber 10 of the diaphragm pump 5 through the water inlet pipe 6.

[0065] In the step S2, pumping into the water storage tank 2 means that the float 1 falls, compresses the flexible diaphragm 12 in the diaphragm pump 5, reduces the volume of the chamber 10, the water inlet check valve 8 on the water inlet pipe 6 closes, and the water outlet check valve 9 on the water outlet pipe 7 opens, and pumps the seawater in the chamber 10 into the water storage tank 2 through the water outlet pipe 7.

[0066] In the step S3, energy storage means that the valve 14 in the water storage tank 2 is in a closed state, and seawater is stored in the water storage tank 2 in the form of gravitational potential energy.

[0067] More preferably, in the step S4, the water turbine generator set 3 generates electricity including continuous power generation and intermittent power generation.

[0068] The continuous power generation means that when generating electricity, the valve 14 is opened, and the high head formed by pumping seawater into the water storage tank 2 through the diaphragm pump 5 continuously falls, driving the water turbine generator set 3 to generate electricity.

[0069] The intermittent power generation means that the high head formed by pumping seawater into the water storage tank 2 through the diaphragm pump 5 is first stored and collected in the water storage chamber of the water storage tank 2, and when generating electricity, the valve 14 is opened again to release the stored and collected high head, driving the water turbine generator set 3 to generate electricity.

[0070] This embodiment is the optimal implementation mode. In step S3, energy storage means that the valve 14 in the water storage tank 2 is in a closed state, and seawater is stored in the water storage tank 2 in the form of gravitational potential energy. While the energy storage battery stores electrical energy, seawater can be stored in the water storage tank 2 in the form of gravitational potential energy. Compared with the prior art, different forms of energy can be stored.

[0071] When transmitting power externally, the maximum transmitted power is the sum of the energy stored in the energy storage battery and the potential energy stored in the seawater in the water storage tank 2; the maximum transmitted power is the sum of the discharge power of the energy storage battery and the power of the water turbine generator set 3. Compared with the prior art, the utilization rate of wave energy can be effectively improved, and the stability of power generation and energy storage can be improved.

[0072] The working process of the diaphragm pump 5 of the present invention is as follows: Since the diaphragm pump 5 is built into the float 1, it can effectively prevent phytoplankton in the sea from adhering to the diaphragm pump 5. The diaphragm pump 5 is used to collect wave energy. The float 1 floats under the action of the wave at the wave crest section. The top plate 11 of the diaphragm pump 5 moves upward with the float 1, and the bottom plate 13 remains relatively stationary, increasing the volume of the chamber 10. The intake check valve 8 on the intake pipe 6 opens, and the discharge check valve 9 on the discharge pipe 7 closes, sucking seawater into the chamber 10 of the diaphragm pump 5 through the intake pipe 6. The float 1 falls under the action of the wave at the wave trough section. The top plate 11 of the diaphragm pump 5 moves downward with the float 1, and the bottom plate 13 remains relatively stationary, reducing the volume of the chamber 10. The intake check valve 8 on the intake pipe 6 closes, and the discharge check valve 9 on the discharge pipe 7 opens, pumping the seawater in the chamber 10 into the water storage tank 2 through the discharge pipe 7.

[0073] The water storage tank 2 of the present invention is arranged on the sea surface. Compared with the prior art that arranges the water storage device on the shore, the layout of the water storage tank 2 can be more flexible, not limited to the coast, and has a wide application range.

[0074] At the same time, compared with the prior art that arranges the water storage device on the shore, resulting in a relatively large height of the liquid level in the water storage device compared to the sea level and a large difficulty in pumping water, the present invention uses the diaphragm pump 5 in the float 1 to pump water into the water storage tank 2, which can effectively solve this problem.

[0075] The entire power generation device of the present invention is all located on the sea, and the water storage tank 2 is organically connected to the float 1. Compared with the prior art, the transmission pipeline is shorter, which can improve the efficiency of the power generation device and reduce the construction and later maintenance costs.

Claims

1. A wave energy-based power generation and energy storage method, characterized in that: The following steps are involved: S1. A fixing frame (4) is arranged at the bottom of the power generation device, a pump is installed in the float (1), and then the water storage tank (2) and the float (1) are respectively connected to the fixing frame (4); S2, the float (1) reciprocates up and down under the action of waves, driving the top plate (11) and the bottom plate (13) of the pump to move relative to each other, sucking seawater into the pump cavity and pumping it into the water storage tank (2); S3, seawater forms a high water head in the water storage tank (2) to store energy; S4, opening the valve (14), the high water head drives the turbine generator set (3) located below the high water head inside the water storage tank (2) to generate electricity, and the generated electric energy is stored in an energy storage battery electrically connected to the turbine generator set (3).

2. A wave energy-based power generation and energy storage method according to claim 1, characterized in that: In step S1, a valve (14) is provided in the water storage tank (2), and the valve (14) divides the water storage tank (2) into an upper water storage chamber for storing seawater and a lower installation chamber for installing the hydro-generator set (3) and the energy storage battery.

3. The wave energy-based power generation and energy storage method according to claim 1, characterized in that: In step S1, the pump is a diaphragm pump (5).

4. The wave energy-based power generation and energy storage method according to claim 1, characterized in that: In the step S1, installing the pump in the float (1) means installing the diaphragm pump (5) in the float (1), the diaphragm pump (5) comprising a top plate (11), a flexible diaphragm (12) and a bottom plate (13), the upper end of the flexible diaphragm (12) being connected to the top plate (11), the lower end of the flexible diaphragm (12) being connected to the bottom plate (13), the top plate (11), the flexible diaphragm (12) and the bottom plate (13) forming a chamber (10), a water inlet pipe (6) and a water outlet pipe (7) being passed through and fixed on the top plate (11), a water inlet check valve (8) being installed on the water inlet pipe (6), and a water outlet check valve (9) being installed on the water outlet pipe (7).

5. A wave energy-based power generation and energy storage method according to claim 4, characterized in that: The water inlet end of the water inlet pipe (6) penetrates the float (1) and extends into the sea, and the water outlet end of the water outlet pipe (7) penetrates the float (1) and is connected to the upper part of the water storage tank (2).

6. The wave energy-based power generation and energy storage method according to claim 1, characterized in that: In step S2, the buoy (1) performs an up and down reciprocating motion under the action of waves, which means that the buoy (1) floats up under the action of waves in the crest section, and the buoy (1) falls down under the action of waves in the trough section.

7. A wave energy-based power generation and energy storage method according to claim 4, characterized in that: In step S2, the seawater is sucked into the chamber (10) of the pump, which means that the float (1) floats up, stretches the flexible diaphragm (12) in the diaphragm pump (5), increases the volume of the chamber (10), opens the water inlet check valve (8) on the water inlet pipe (6), closes the water outlet check valve (9) on the water outlet pipe (7), and sucks the seawater into the chamber (10) of the diaphragm pump (5) through the water inlet pipe (6).

8. The wave energy-based power generation and energy storage method according to claim 4, characterized in that: In step S2, pumping into the water storage tank (2) means that the float (1) falls, compressing the flexible diaphragm (12) in the diaphragm pump (5), reducing the volume of the chamber (10), closing the water inlet check valve (8) on the water inlet pipe (6), and opening the water outlet check valve (9) on the water outlet pipe (7), so that the seawater in the chamber (10) is pumped into the water storage tank (2) through the water outlet pipe (7).

9. The wave energy-based power generation and energy storage method according to claim 1, characterized in that: In step S3, energy storage means that the valve (14) in the water storage tank (2) is in a closed state, and seawater is stored in the water storage tank (2) in the form of gravitational potential energy.

10. A wave energy-based power generation and energy storage method according to claim 4, characterized in that: In step S4, the power generation of the hydro-generator set (3) includes continuous power generation and intermittent power generation.

11. A wave energy-based power generation and energy storage method according to claim 10, characterized in that: The continuous power generation means that when power is generated, the valve (14) is opened, and the high water head formed by pumping seawater into the water storage tank (2) through the diaphragm pump (5) continuously falls, driving the hydro-generator set (3) to generate power.

12. The wave energy-based power generation and energy storage method according to claim 10, characterized in that: The interval power generation refers to the process of pumping seawater into the water storage tank (2) through a diaphragm pump (5) to form a high water head which is first stored and collected in the water storage chamber of the water storage tank (2), and then opening the valve (14) when power is generated to release the stored and collected high water head, thereby driving the hydro-generator set (3) to generate power.

13. An application of a wave energy-based power generation and energy storage method, characterized in that: By adopting the wave energy-based power generation and energy storage method as claimed in claim 1, when transmitting electricity to the outside, the maximum transmission energy is the sum of the energy stored in the energy storage battery and the potential energy stored in the seawater in the water storage tank (2).

14. An application of a wave energy-based power generation and energy storage method, characterized in that: By adopting the wave energy-based power generation and energy storage method as claimed in claim 1, when transmitting electricity to the outside, the maximum transmission power is the sum of the discharge power of the energy storage battery and the power of the hydro-turbine generator set (3).

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