Offshore floating type Stirling power generation device and power generation method

Abstract

The invention discloses an offshore floating type Stirling power generation device and an implementation method. The offshore floating type Stirling power generation device comprises a heat collection assembly, a piston cylinder body, a power piston, a gas exchange pipeline, a heat dissipation assembly, a first coil and a second coil. The power piston is a permanent magnet; an expansion cavity is formed between the heat collection assembly and the piston cylinder body; a cooling cavity is formed between the heat dissipation assembly and the piston cylinder body. Wherein the expansion cavity is formed in the first end, on the water surface, of the piston cylinder body, and the cooling cavity is formed in the second end, under the water, of the piston cylinder body; the first coil is arranged at the first end; the second coil is arranged at the second end; the gas exchange pipe is used for connecting the expansion cavity and the cooling cavity; when the power piston moves towards the second end, the gas exchange pipe transmits gas in the cooling cavity to the expansion cavity; when the power piston moves towards the first end, the gas exchange pipe transmits gas in the expansion cavity to the cooling cavity. The method can be widely applied to the technical field of offshore power generation.

Description

Technical Field

[0001] The present application relates to the field of offshore power generation technology, and in particular to an offshore floating Stirling power generation device and a power generation method. Background Art

[0002] Traditional ocean thermoelectric power generation (OTEC) systems have problems such as large device size, low working fluid circulation efficiency, large mechanical transmission losses, and high energy consumption for deep-sea cold seawater extraction, which are not conducive to the realization of miniaturized distributed applications.

[0003] In order to improve the above technical problems, the related art proposes an energy conversion device using a Stirling engine. The Stirling engine is a highly efficient energy conversion device that outputs power through the cooling, compression, heat absorption, and expansion cycle of the working medium (such as hydrogen or helium) in the cylinder. It has the advantages of high thermal efficiency and wide adaptability. However, in the related art, Stirling generators mostly rely on mechanical piston drives. Mechanical piston-driven generators are easily affected by environmental factors such as ocean currents, waves, and seawater corrosion, resulting in low power generation stability. Therefore, there are still technical problems that need to be solved in the related art. Summary of the Invention

[0004] The purpose of this application is to solve one of the technical problems existing in the prior art to at least a certain extent.

[0005] To this end, one purpose of an embodiment of the present application is to provide an offshore floating Stirling power generation device and a power generation method, which can improve the stability of the generator.

[0006] In order to achieve the above technical objectives, the technical solution adopted in the embodiment of the present application includes: an offshore floating Stirling power generation device, comprising:

[0007] A heat collecting assembly, a piston cylinder, a power piston, a gas exchange pipeline, a heat dissipation assembly, a first coil, and a second coil; the power piston is a permanent magnet; an expansion chamber is formed between the heat collecting assembly and the piston cylinder; a cooling chamber is formed between the heat dissipation assembly and the piston cylinder; wherein the expansion chamber is provided at the first end of the piston cylinder above the water surface, and the cooling chamber is provided at the second end of the piston cylinder below the water surface; the first coil is provided at the first end; and the second coil is provided at the second end;

[0008] The gas exchange tube is used to connect the expansion chamber and the cooling chamber; when the power piston moves toward the second end, the gas exchange tube transfers the gas in the cooling chamber to the expansion chamber; when the power piston moves toward the first end, the gas exchange tube transfers the gas in the expansion chamber to the cooling chamber.

[0009] The present application realizes electromagnetic piston power generation by reciprocating the permanent magnet power piston in the piston cylinder, so that the first coil and the second coil generate electrical energy. The electromagnetic power generation adopted by the present application has higher stability than the traditional mechanical piston-driven generator. In addition, since the motion trajectory of the power piston of the present application is a longitudinal motion perpendicular to the horizontal plane, compared with the traditional mechanical Stirling generator, the present application can better reduce the impact of the force parallel to the sea surface generated by ocean currents and waves on the generator. At the same time, the design of the longitudinal movement of the power piston of the present application can also reduce the corrosion caused by seawater penetrating into the interior of the generator, further improving the stability of the generator.

[0010] In addition, the offshore floating Stirling power generation device according to the above embodiment of the present invention may also have the following additional technical features:

[0011] Furthermore, in an embodiment of the present application, the heat collecting assembly includes a Fresnel lens, a heat collecting rod and a radiator; the Fresnel lens is used to convert solar radiation into thermal energy and concentrate the thermal energy on the heat collecting rod; the heat collecting rod is used to conduct the thermal energy to the radiator; the radiator is used to dissipate the thermal energy in the expansion chamber to expand the gas in the expansion chamber.

[0012] Furthermore, in an embodiment of the present application, the power generation device also includes a heat storage structure; the heat storage structure is connected to the heat collecting rod.

[0013] Furthermore, in an embodiment of the present application, the power generation device further includes a positioning detection component; the positioning detection component is used to detect the position of the power piston in the piston cylinder.

[0014] Furthermore, in an embodiment of the present application, the positioning detection component includes an induction magnet and a Hall sensor; the induction magnet is arranged on the power piston; and the Hall sensor is arranged on the piston cylinder.

[0015] Furthermore, in an embodiment of the present application, the power generation device further includes an elastic component; the elastic component is disposed at the second end; when the power piston moves to the second end, the elastic component abuts against the power piston.

[0016] Furthermore, in an embodiment of the present application, the power generation device includes a floating shell and a connector; the connector is arranged on the floating shell; and the connector is used to connect two of the offshore floating Stirling power generation devices.

[0017] Furthermore, in an embodiment of the present application, the heat dissipation assembly includes a heat-conducting rod and a heat-conducting ball; the heat-conducting rod is connected to the heat-conducting ball.

[0018] Furthermore, in an embodiment of the present application, the heat collecting assembly further includes a rotating cleaning brush; the rotating cleaning brush is arranged on the surface of the Fresnel lens facing the sun.

[0019] On the other hand, an embodiment of the present application further provides a power generation method, which is implemented by the offshore floating Stirling power generation device described in any of the above items, and the method includes:

[0020] When the heat collection assembly collects solar energy and the gas inside the expansion chamber reaches a preset pressure, the gas pushes the power piston to move toward the second end underwater, so that the first coil and the second coil provided on the piston cylinder body charge the power storage assembly and compress the gas in the cooling chamber, so that the gas in the cooling chamber is transferred to the expansion chamber through the gas exchange tube;

[0021] When the power piston moves to a preset position, the first coil or the second coil is controlled to generate a reverse magnetic field to move the power piston toward the first end, and compress the gas in the expansion chamber so that the gas in the expansion chamber is conducted to the cooling chamber through the gas exchange tube.

[0022] The advantages and benefits of this application will be partially given in the following description, and partially become apparent from the following description, or learned through practice of this application:

[0023] This application uses a permanent magnet power piston to reciprocate within a piston cylinder, causing the first coil and the second coil to generate electrical energy, thereby achieving electromagnetic piston power generation. The electromagnetic power generation used in this application has higher stability than traditional mechanical piston-driven generators. In addition, because the motion trajectory of the power piston in this application is a longitudinal motion perpendicular to the sea level, compared to traditional mechanical Stirling generators, this application can better reduce the impact of ocean currents, waves, and seawater corrosion on the generator, further improving the stability of the generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of an offshore floating Stirling power generation device in a specific embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall structure of an offshore floating Stirling power generation device in another specific embodiment of the present invention;

[0026] Figure 3 A schematic flow chart of a power generation method of an offshore floating Stirling power generation device in a specific embodiment of the present invention;

[0027] Figure 4Fig. 1 is a schematic diagram of the power generation process of the offshore floating Stirling power generation device according to another embodiment of the present application. DETAILED DESCRIPTION

[0028] The principles and processes of the offshore floating Stirling power generation device and the power generation method according to the embodiments of the present application are described below in detail with reference to the accompanying drawings.

[0029] In Figure 1-Figure 2 , 101 is a piston cylinder, 102 is a power piston, 103 is a gas exchange pipe, 104 is a first coil, 105 is a second coil, 106 is an expansion chamber, 107 is a cooling chamber, 108 is a regenerator, 109 is a heat storage structure, 110 is an elastic component, 111 is a floating body shell, 112 is a connector, 113 is a aerogel insulation layer, 114 is an induction magnet, 115 is a Hall inductor, 116 is a Fresnel lens, 117 is a heat collecting rod, 118 is a heat sink, 119 is a bracket, 120 is a rotary cleaning brush, 121 is an ultraviolet resistant polycarbonate film, 122 is a reflective coating, 123 is a heat conducting rod, and 124 is a heat conducting ball.

[0030] With reference to Figure 1 , the present application provides an offshore floating Stirling power generation device. The device can be arranged on the sea. The power generation device can include a heat collecting assembly, a piston cylinder, a power piston, a gas exchange pipe, a heat dissipating assembly, a first coil, and a second coil. When the device is arranged on the sea, the heat collecting assembly can be arranged above the sea level. The piston cylinder, the power piston, the gas exchange pipe, the heat dissipating assembly, the first coil, and the second coil can be sealed and arranged below the sea level. The power piston can be a permanent magnet. The heat collecting assembly and the piston cylinder can form an expansion chamber therebetween. The expansion chamber can be located between the power piston and the heat collecting assembly. The heat dissipating assembly and the piston cylinder can form a cooling chamber therebetween. The cooling chamber can be located between the power piston and the heat dissipating assembly. The expansion chamber can be arranged at a first end of the piston cylinder above the water surface, and the cooling chamber can be arranged at a second end of the piston cylinder below the water surface. The first coil can be wound around an end of the piston cylinder close to the heat collecting assembly, and the second coil can be wound around an end of the piston cylinder close to the heat dissipating assembly. The gas exchange pipe can be used to connect the expansion chamber and the cooling chamber. When the power piston moves towards the second end of the piston cylinder, the cooling gas in the cooling chamber can enter the expansion chamber through the gas exchange pipe due to the pressure of the power piston, and when the power piston moves towards the first end of the piston cylinder, the expansion gas in the expansion chamber can enter the cooling chamber through the gas exchange pipe due to the pressure of the power piston.

[0031] The power generation device of this embodiment uses a permanent magnet power piston to reciprocate within the piston cylinder, causing the first coil and the second coil to generate electrical energy, thereby realizing electromagnetic piston power generation. The electromagnetic power generation adopted in this application has higher stability than traditional mechanical piston-driven generators. In addition, since the motion trajectory of the power piston of this application is a longitudinal motion perpendicular to the horizontal plane, compared with traditional mechanical Stirling generators, this application can better reduce the impact of ocean currents, waves and seawater corrosion on the generator, further improving the stability of the generator.

[0032] In some embodiments of the present application, reference is made to Figure 1 A regenerator is further provided between the gas exchange tube and the expansion chamber. The expansion gas entering the gas exchange tube from the expansion chamber can first be cooled by the regenerator before entering the cooling chamber. The cooling gas entering the expansion chamber from the cooling chamber through the gas exchange tube can first be heated by the regenerator before entering the expansion chamber.

[0033] In some embodiments of the present application, the power piston may include a stator and a mover. The mover may be made of a permanent magnet material.

[0034] In some embodiments of the present application, reference is made to Figure 2 The solar collector assembly may include a Fresnel lens, a solar collector rod, and a heat sink. The Fresnel lens converts solar radiation into heat energy and concentrates it on the solar collector rod. The solar collector rod conducts the heat to the heat sink, which dissipates it within an expansion chamber, causing the gas within the chamber to expand. The Fresnel lens may be a spherical lens. This spherical lens absorbs solar energy from multiple angles, maximizing the efficiency of converting solar energy into heat. The spherical Fresnel lens may have a cavity within it, into which the solar collector rod resides. The heat sink may be connected to the solar collector rod and placed within the cavity, transferring heat from the collector rod to the heat sink. An inert gas may be placed within the cavity. The inert gas has relatively high chemical stability, allowing it to expand when heated while preventing chemical reactions that could potentially reduce the overall stability of the power generation device. While there is a risk of gas escaping into the Fresnel lens cavity, the inert gas also prevents reactions with the Fresnel lens or solar collector rod, improving device stability. More specifically, to increase the overall buoyancy of the device, the density of the inert gas can be less than that of seawater. Therefore, the inert gas can be helium, or a mixture of helium and other inert gases, such as a helium-nitrogen mixture or a helium-neon mixture. The specific gas type and mixing ratio are not limited herein.

[0035] It can be understood that the material of the heat collecting rod can be graphene. Graphene has good thermal conductivity and high chemical stability, which can improve the stability of the entire power generation device.

[0036] In addition, in some embodiments, in order to further improve the efficiency of the power generation device, the Fresnel lens can be arranged in a double-layer structure. Specifically, referring to Figure 2 , the Fresnel lens can be arranged as an outer Fresnel lens and an inner Fresnel lens, and the outer Fresnel lens and the inner Fresnel lens are concentric spheres. A heat-conducting fluid or heat-conducting oil can be arranged between the outer Fresnel lens and the inner Fresnel lens. The heat-conducting fluid or heat-conducting oil can improve the energy transmission efficiency of the Fresnel lens. The surface of the outer Fresnel lens facing the sun can be provided with a layer of ultraviolet-resistant polycarbonate film. The surface of the inner Fresnel lens close to the center of the sphere can be provided with a layer of reflective coating. The reflective coating can reflect sunlight to the heat collecting rod, further improving the energy conversion efficiency.

[0037] In other embodiments, the heat collecting assembly can also include a support. The support can fix the Fresnel lens, reduce the defect of the Fresnel lens deviating due to the influence of ocean currents and waves, and affect the energy conversion efficiency. The support can be made of low-density polymer materials such as polyethylene. The low-density polymer material can increase the overall buoyancy of the device while improving the corrosion resistance of the support, further improving the stability of the device. It can be understood that there are many kinds of low-density polymer materials, and the specific support material is not limited here.

[0038] In other embodiments, a rotating cleaning brush can also be arranged on the heat collecting assembly. The rotating cleaning brush is arranged on the surface of the Fresnel lens facing the sun or on the ultraviolet-resistant polycarbonate film. The rotating cleaning brush can reduce the dirt or sea salt crystals on the Fresnel lens, increase the proportion of the Fresnel lens receiving solar radiation, and improve the energy utilization efficiency of the power generation device. In some embodiments, the rotating cleaning brush can be connected with the power storage assembly of the power generation device itself and be driven by the power of the power generation device itself. In other embodiments, the rotating cleaning brush can be provided with a special power source and be driven by an external power source. In addition, the cleaning period of the rotating cleaning brush can be set according to specific needs, such as setting the cleaning period to 1 hour. At this time, the rotating cleaning brush can clean the Fresnel lens every hour. It can be understood that the specific value of this cleaning period can also be adjusted to other time lengths, and the specific time length is not limited here.

[0039] Furthermore, in some embodiments, the solar energy concentrated by the Fresnel lens can generate a large amount of heat. The large amount of heat causes the gas in the expansion chamber to expand while also causing the temperature of other components to rise. In order to improve the solar energy utilization efficiency of the power generation device and to reduce the damage of high temperature to other components of the device, the power generation device of the present application may also include a heat storage structure. The heat storage structure can be connected to the heat collecting rod. The heat storage structure can store heat other than the heat required for the expansion gas, and then at night when there is no solar energy, the heat storage structure can continue to release the stored heat to maintain the power generation process of the power generation device.

[0040] In some embodiments, the energy storage structure may include a heat storage kettle. The material of the heat storage kettle may be a metal or alloy, such as iron or steel. A phase change material may be provided in the heat storage kettle. Furthermore, the phase change material may be R717 or R254 or other commonly used phase change materials. The chemical name of R717 is ammonia, which is a natural refrigerant (inorganic compound). It has excellent thermodynamic properties, relatively high latent heat of evaporation and heat transfer performance. At the same time, the low cost of ammonia raw materials can improve the practicality of the power generation device. In addition, ammonia has good compatibility with many metal materials. R254 is 1,1,1,3,3-pentafluorobutane. It can replace HCFC or CFC refrigerants such as R12 and R502. It has relatively low toxicity compared to refrigerants such as R12 and R502.

[0041] Furthermore, in some embodiments of the present application, the power generation device may further include a positioning detection component. The positioning detection component may include an induction magnet and a Hall sensor. The induction magnet may be provided on the power piston, and the Hall sensor may be provided on the piston cylinder. Specifically, referring to Figure 2 Two induction magnets and two Hall sensors can each be provided. One induction magnet can be provided at the end of the power piston near the heat collection chamber, and correspondingly, the Hall sensor can be provided at the end of the piston cylinder near the heat collection chamber. The other induction magnet can be provided at the end of the power piston near the cooling chamber, and correspondingly, the Hall sensor can be provided at the end of the piston cylinder near the cooling chamber.

[0042] In other embodiments, one of the induction magnets can be set at the end of the power piston close to one end of the heat collection chamber, and correspondingly, the Hall sensor can be set at the end of the piston cylinder close to one end of the heat collection chamber. Another induction magnet can be set in the middle of the power piston, and correspondingly, the Hall sensor can be set in the middle of the piston cylinder. This embodiment can determine the specific position of the power piston through two Hall sensors and two induction magnets. After obtaining the specific position, the device of this embodiment can determine whether the first coil or the second coil is needed to provide a reverse magnetic field based on the position of the power piston.

[0043] Furthermore, in an embodiment of the present application, the power generation device may also include an elastic component. The elastic component may be provided at the second end of the piston cylinder, that is, the end away from the heat collection chamber. When the power piston moves to the second end, the elastic component abuts against the power piston. The elastic component provided at the second end of the piston cylinder can buffer the momentum of the power piston when it moves to the second end, thereby preventing the power piston from causing wear on the piston cylinder. At the same time, when the elastic component is compressed to the maximum deformation, the elastic component can provide initial power for the movement of the power piston toward the first end of the piston cylinder.

[0044] Further, in some embodiments of the present application, referring to Figure 2 The power generation device may include a buoyant housing and a connector. The density of the buoyant housing can be lower than that of seawater. The density of the buoyant housing can seal the heat storage structure, piston cylinder, power piston, gas exchange piping, heat dissipation assembly, first coil, and second coil, thereby preventing seawater from penetrating the piston cylinder, power piston, gas exchange piping, heat dissipation assembly, first coil, and second coil, and thus preventing seawater from corroding the power generation device structure. The buoyant housing can be made of a polymer or other low-density material. The buoyant housing provides buoyancy for the entire system, allowing the heat collection assembly and portions of the buoyant unit to remain above the water surface. Low-density materials have a relatively low melting point. To minimize the impact of the temperature of the heat storage structure, piston cylinder, power piston, gas exchange piping, and heat dissipation assembly on the stability of the buoyant housing, in this embodiment, an aerogel insulation layer can be provided between the heat storage structure, piston cylinder, power piston, gas exchange piping, heat dissipation assembly, and the buoyant housing, thereby thermally isolating the heat storage structure, piston cylinder, power piston, gas exchange piping, heat dissipation assembly, and the buoyant housing. Connectors can be set around the floating shell, which can connect two or more power generation modules together to achieve an array arrangement and increase the scale of power generation.

[0045] Further, in some embodiments of the present application, referring to Figure 2 The heat dissipation component may include a heat-conducting rod and a heat-conducting ball. The heat-conducting rod may be connected to the cooling chamber. The heat-conducting ball may be connected to the heat-conducting rod. The heat-conducting rod may be arranged longitudinally underwater. The heat-conducting ball may be arranged at the end of the power generation device closest to the seabed. Furthermore, the heat-conducting ball is sealed from the floating shell to prevent seawater from penetrating and corroding any of the piston cylinder, power piston, gas exchange pipeline, heat dissipation component, first coil and second coil. An aerogel insulation layer is provided between the floating shell and the heat-conducting rod. Since the floating shell adopts a low-molecular-density material with a relatively low melting point, the aerogel insulation layer can reduce the heat dissipation to the floating shell and improve the stability of the floating shell.

[0046] It is understandable that the material of the heat conducting rod and the heat conducting ball can be graphene, which has relatively good thermal conductivity. At the same time, graphene has relatively high chemical stability and good resistance to seawater corrosion, which can improve the stability of the entire power generation device.

[0047] Furthermore, in some embodiments of the present application, the power generation device may include a storage component. In some embodiments, the storage component may be connected to one of the first coil and the second coil. In some embodiments, the storage component may be connected to both the first coil and the second coil. The storage component may include an inverter and a battery. The inverter may be electrically connected to the battery, and either the first coil or the second coil may be connected to the inverter. The inverter may convert the induced electromotive force generated by the coil connected thereto into electrical energy for the battery. The battery may be connected to either the first coil or the second coil.

[0048] In other embodiments, the inverter can be electrically connected to a battery. Both the first coil and the second coil can be connected to the inverter. In this case, two inverters can be provided. One inverter can be connected to the first coil, and the other inverter can be connected to the second coil. The two inverters can convert the induced electromotive force generated by the two coils into electrical energy for the battery. At the same time, the battery can be electrically connected to the first coil or the second coil, providing current to the first coil or the second coil to generate a reverse magnetic field, thereby providing power for the power piston to move toward the water surface through one coil.

[0049] Furthermore, when either the first coil or the second coil is connected to the inverter, the number of turns of the first coil may not be equal to the number of turns of the second coil. Specifically, the number of turns of the first coil may be greater than the number of turns of the second coil. In this case, the inverter can be connected to the first coil, and the battery can be electrically connected to the second coil, supplying current to the second coil to generate a reverse magnetic field, thereby providing power for the power piston to move toward the water surface. Specifically, the number of turns of the first coil may be less than the number of turns of the second coil. In this case, the inverter can be connected to the second coil, and the battery can be electrically connected to the first coil, supplying current to the first coil to generate a reverse magnetic field, thereby providing power for the power piston to move toward the water surface. It can be understood that because the number of turns of the coil connected to the inverter is always greater than the number of turns of the coil powered by the battery, the battery's electrical energy can continue to increase.

[0050] In some embodiments, a battery can be connected to the rotating cleaning brush. The battery can provide electrical energy to the rotating cleaning brush. The rotating cleaning brush can use the electrical energy generated by the power generation device to periodically clean the Fresnel lens.

[0051] In addition, the embodiment of the present application also provides a method for generating electricity. The method is implemented by the above-mentioned offshore floating Stirling power generation device. Figure 3 The method may include steps S101 and S102.

[0052] S101. When the heat collecting assembly collects solar energy and the gas inside the expansion chamber reaches a preset pressure, the gas pushes the power piston to move toward the second end underwater, so that the first coil and the second coil arranged on the piston cylinder body charge the power storage assembly and compress the gas in the cooling chamber, so that the gas in the cooling chamber is conducted to the expansion chamber through the gas exchange tube.

[0053] S102. When the power piston moves to a preset position, the first coil or the second coil is controlled to generate a reverse magnetic field to move the power piston toward the first end, and compress the gas in the expansion chamber so that the gas in the expansion chamber is conducted to the cooling chamber through the gas exchange tube.

[0054] It is understood that the preset position may be the position where the power piston abuts the elastic component or the bottom wall of the piston cylinder. The preset pressure may be the pressure required for the power piston to overcome the friction between the power piston and the piston cylinder and move underwater.

[0055] Specifically, when the heat collection component collects solar energy and causes the gas inside the expansion chamber to reach a preset pressure, the gas expands and can push the power piston to move toward the second end of the piston cylinder disposed underwater. At this time, during the movement of the power piston of the permanent magnet, the permanent magnet causes the magnetic flux of the first coil to change, thereby causing the first coil to generate an induced electromotive force (electric energy). Then the permanent magnet continues to move underwater, causing the magnetic flux of the second coil to change, thereby causing the second coil to generate an induced electromotive force (electric energy). The induced electromotive force generated by the first coil is converted into electrical energy of the battery through the inverter. At the same time, when the piston of the permanent magnet moves underwater, the power piston can continuously compress the gas in the cooling chamber, so that the gas in the cooling chamber is conducted back to the regenerator disposed in the expansion chamber through the gas exchange tube, thereby reducing the gas resistance in the cooling chamber.

[0056] When the power piston moves to a position where it contacts the elastic component or the bottom wall of the piston cylinder, the controller can control the battery to conduct with the first coil. Due to the action of the current, the first coil can generate a reverse magnetic field. Under the action of the reverse magnetic field, the permanent magnet piston moves toward the first end located on the water surface. When it moves to a preset position of the piston cylinder, the controller can control the battery to conduct with the second coil, so that the second coil also generates a reverse magnetic field to push the power piston to continue moving toward the first end. At the same time, the permanent magnet power piston can compress the gas in the expansion chamber so that the gas in the expansion chamber is conducted to the cooling chamber through the regenerator and the gas exchange tube, reducing the gas resistance in the expansion chamber.

[0057] The specific implementation method of the power generation device is described below with reference to the accompanying drawings.

[0058] In the embodiment, the elastic component can be a spring, which can be arranged at the second end of the piston cylinder, i.e., at the end of the piston cylinder away from the heat collection assembly.

[0059] Specifically, the power generation device can be deployed at sea and can float on the sea under the action of the floating body shell. Referring to Figure 4 When the sunlight of the day continuously irradiates the heat collection assembly of the power generation device, the Fresnel lens of the heat collection assembly can concentrate the sunlight and heat the heat collection rod. The heat can be transmitted to the gas in the expansion cavity through the heat collection rod and the heat sink, and at the same time, the heat collection rod can store the excess heat in the heat storage structure with the phase change material. The gas in the expansion cavity is heated and expanded and pushes the power piston to move downward from the initial position. During the movement of the power piston downward, the power piston changes the magnetic flux of the first coil, thereby causing the first coil to generate an induced electromotive force (electric energy), and the electric energy is converted into the electric energy of the storage battery through the inverter. Then the power piston continues to move downward, so that the magnetic flux of the second coil changes, thereby causing the second coil to generate an induced electromotive force (electric energy), and the electric energy is converted into the electric energy of the storage battery through the inverter. When the power piston moves to the position in contact with the spring, at this time, the power piston continuously extrudes the spring to produce elastic deformation, and after extruding to the maximum deformation amount of the spring, the positioning detection assembly also detects that the power piston moves to the first target position. At this time, referring to Figure 4 (d) of FIG. 4, the controller can energize the second coil through the storage battery, and due to the action of the current, the second coil generates a reverse magnetic field, and at the same time, the elastic force of the spring makes the power piston compress the expansion cavity along the piston cylinder, part of the gas in the expansion cavity flows to the cooling cavity through the regenerator and the gas exchange pipe, and finally the power piston returns to the initial position, thereby completing a cycle of power generation. It can be understood that in one power generation cycle, the electric energy received by the storage battery is always greater than the output electric energy. Therefore, in each power generation cycle, the storage battery can store electric energy.

[0060] When there is no sunlight at night, the heat storage structure can transfer the heat stored during the day to the gas in the expansion chamber through the collector rod and radiator. The gas in the expansion chamber expands due to the heat and pushes the power piston to move underwater from its initial position. During the movement of the power piston, the power piston causes the magnetic flux of the first coil to change, thereby causing the first coil to generate an induced electromotive force (electric energy), which is converted into battery energy through the inverter. The power piston then continues to move underwater, causing the magnetic flux of the second coil to change, thereby causing the second coil to generate an induced electromotive force (electric energy), which is converted into battery energy through the inverter. When the power piston moves to the position where it contacts the spring, the power piston continuously squeezes the spring to cause it to produce elastic deformation. After squeezing the spring to the maximum deformation, the positioning detection component also detects that the power piston has moved to the first target position. At this time, the controller can energize the second coil through the battery. Due to the action of the current, the second coil generates a reverse magnetic field. At the same time, the elastic force of the spring causes the power piston to compress the expansion chamber along the piston cylinder. Part of the gas in the expansion chamber flows to the cooling chamber through the regenerator and the gas exchange tube, and finally the power piston returns to the initial position, thereby completing a cycle of power generation.

[0061] Furthermore, to improve the heat collection efficiency of the solar collector assembly, a rotating cleaning brush is installed on the sun-facing surface of the Firth lens of the solar collector assembly. The rotating cleaning brush regularly cleans the sun-facing surface of the Firth lens, reducing the accumulation of seawater crystals and other contaminants on the sun-facing surface.

[0062] In some embodiments, in order to improve the cooling capacity of the cooling cavity, the cooling cavity is always connected to the graphene thermal conductive rod, and the graphene thermal conductive rod is connected to the underwater graphene thermal conductive ball, thereby improving the cooling capacity of the cooling cavity through the cooling effect of seawater.

[0063] and Figure 1 Corresponding to the structure, an embodiment of the present application also provides an offshore floating Stirling power generation system. The system may include two or more offshore floating Stirling power generation devices. Any two offshore floating Stirling power generation devices may be connected together by a connector provided on the floating shell. The system may form an array or chain structure of two or more offshore floating Stirling power generation devices. Compared with an independent offshore floating Stirling power generation device, the system has better ability to resist wind and waves and has better stability. At the same time, two or more offshore floating Stirling power generation devices can store electrical energy at the same time, thereby improving the overall power generation efficiency of the system.

[0064] In some embodiments, since the power requirement of the controller is relatively small, and the control interface of a general control chip, such as a single-chip microcomputer, is relatively large, the system can use the same controller to provide control signals for two or more than two offshore floating Stirling power generation devices to provide control signals for reverse magnetic field. At this time, since the entire system only needs one controller to consume energy, the entire system can store more electric energy in one power generation cycle, and improve the electric energy conversion efficiency of the entire system.

[0065] In addition, in some embodiments, since the controller can control the rotating cleaning brush to periodically clean the deposits on the surface of the Fresnel lens, the system can use a multi-interface single-chip microcomputer to generate the control signal of the rotating cleaning brush. At this time, one controller can be used to control multiple rotating cleaning brushes to clean simultaneously or continuously. It can be understood that when one controller controls multiple rotating cleaning brushes to continuously clean the Fresnel lens, the duration of two adjacent control signals can be the same as the time required to clean the Fresnel lens.

[0066] It should be noted that the above-mentioned content in the offshore floating Stirling power generation device embodiments is applicable to the present power generation system embodiments. The power generation system embodiments specifically realize the same functions as the above-mentioned offshore floating Stirling power generation device embodiments, and achieve the same beneficial effects as the above-mentioned offshore floating Stirling power generation device embodiments.

[0067] In some alternative embodiments, the functions / operations mentioned in the block diagram can not occur in the order mentioned in the operation diagram. For example, depending on the functions / operations involved, two blocks shown in succession can actually be executed substantially simultaneously or the blocks can sometimes be executed in reverse order. In addition, the embodiments presented and described in the flowcharts of the present application are provided by way of example, and the purpose is to provide a more comprehensive understanding of the technology. The disclosed method is not limited to the operations and logical flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and in which sub-operations described as part of larger operations are independently executed.

[0068] In addition, although the present application is described in the context of functional modules, it should be understood that, unless otherwise stated, one or more of the functions and / or features may be integrated into a single physical device and / or software module, or one or more functions and / or features may be implemented in separate physical devices or software modules. It is also understood that a detailed discussion of the actual implementation of each module is not necessary for understanding the present application. More specifically, given the properties, functions, and internal relationships of the various functional modules in the devices disclosed herein, the actual implementation of the module will be understood within the routine skills of an engineer. Therefore, a person skilled in the art can implement the present application as set forth in the claims using ordinary techniques without undue experimentation. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present application, which is determined by the full scope of the appended claims and their equivalents.

[0069] In the above description of this specification, reference to the terms "one embodiment / example," "another embodiment / example," or "certain embodiments / examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0070] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

[0071] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. An offshore floating Stirling power generation device, characterized in that: include: Heat collection assembly, piston cylinder, power piston, gas exchange pipeline, heat dissipation assembly, first coil and second coil; The power piston is a permanent magnet; an expansion chamber is formed between the heat collecting assembly and the piston cylinder; a cooling chamber is formed between the heat dissipating assembly and the piston cylinder; wherein the expansion chamber is provided at the first end of the piston cylinder above the water surface, and the cooling chamber is provided at the second end of the piston cylinder under the water; the first coil is provided at the first end; and the second coil is provided at the second end; The gas exchange tube is used to connect the expansion chamber and the cooling chamber; when the power piston moves toward the second end, the gas exchange tube transfers the gas in the cooling chamber to the expansion chamber; when the power piston moves toward the first end, the gas exchange tube transfers the gas in the expansion chamber to the cooling chamber.

2. The offshore floating Stirling power generation device according to claim 1, characterized in that: The heat collecting assembly includes a Fresnel lens, a heat collecting rod and a radiator; the Fresnel lens is used to convert solar radiation into thermal energy and concentrate the thermal energy on the heat collecting rod; the heat collecting rod is used to conduct the thermal energy to the radiator; the radiator is used to dissipate the thermal energy in the expansion chamber to expand the gas in the expansion chamber.

3. The offshore floating Stirling power generation device according to claim 2, characterized in that: The power generation device further includes a heat storage structure; the heat storage structure is connected to the heat collecting rod.

4. The offshore floating Stirling power generation device according to claim 1, characterized in that: The power generation device further includes a positioning detection component; the positioning detection component is used to detect the position of the power piston in the piston cylinder.

5. The offshore floating Stirling power generation device according to claim 4, characterized in that: The positioning detection component includes an induction magnet and a Hall sensor; the induction magnet is arranged on the power piston; and the Hall sensor is arranged on the piston cylinder.

6. The offshore floating Stirling power generation device according to claim 1, characterized in that: The power generation device further includes an elastic component; the elastic component is arranged at the second end; when the power piston moves to the second end, the elastic component abuts against the power piston.

7. The offshore floating Stirling power generation device according to claim 1, characterized in that: The power generation device includes a floating shell and a connector; the connector is arranged on the floating shell; the connector is used to connect two offshore floating Stirling power generation devices.

8. The offshore floating Stirling power generation device according to claim 1, characterized in that: The heat dissipation component includes a heat conducting rod and a heat conducting ball; the heat conducting rod is connected to the heat conducting ball.

9. The offshore floating Stirling power generation device according to claim 2, characterized in that: The heat collection assembly further includes a rotating cleaning brush; the rotating cleaning brush is arranged on the surface of the Fresnel lens facing the sun.

10. A method for generating electricity, characterized in that: The method is implemented by the offshore floating Stirling power generation device according to any one of claims 1 to 9, and the method comprises: When the heat collection assembly collects solar energy and the gas inside the expansion chamber reaches a preset pressure, the gas pushes the power piston to move toward the second end underwater, so that the first coil and the second coil provided on the piston cylinder body charge the power storage assembly and compress the gas in the cooling chamber, so that the gas in the cooling chamber is transferred to the expansion chamber through the gas exchange tube; When the power piston moves to a preset position, the first coil or the second coil is controlled to generate a reverse magnetic field to move the power piston toward the first end, and compress the gas in the expansion chamber so that the gas in the expansion chamber is conducted to the cooling chamber through the gas exchange tube.

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