CN118030432A - Ocean temperature difference energy power generation device and system - Google Patents

Abstract

The invention discloses a marine temperature difference energy power generation device and a marine temperature difference energy power generation system. The ocean temperature difference energy power generation device comprises: the device comprises a heat storage module, a submerged floating module and a thermoelectric generation module; the heat storage module is used for storing heat of the surface layer of the hot seawater; the submerged floating module is used for adjusting the buoyancy of the ocean temperature difference energy power generation device when the heat stored by the heat storage module reaches a first preset value, so as to realize submerged operation; when the heat stored by the heat storage module reaches a second preset value, the buoyancy of the ocean temperature difference energy power generation device is regulated, so that floating operation is realized; the thermoelectric power generation module is used for generating power when the ocean thermoelectric power generation device is submerged to a first preset depth. According to the technical scheme, the ocean temperature difference energy power generation device comprises the heat storage module, the submerged floating module and the temperature difference power generation module, the heat storage module stores energy of an ocean surface layer heat source, the submerged floating module realizes in-situ extraction of energy through buoyancy change, system energy consumption is reduced, the temperature difference power generation module realizes power generation, and temperature difference energy resource utilization is completed.

Description

Ocean temperature difference energy power generation device and system

Technical Field

The invention relates to the technical field of power generation, in particular to a marine temperature difference energy power generation device and a marine temperature difference energy power generation system.

Background

Ocean temperature difference energy is an important ocean renewable energy source, and reasonable development of the ocean temperature difference energy is beneficial to improving energy structure, controlling climate change and solving the problem of environmental pollution. Compared with other ocean energy, the energy of the temperature difference energy is more stable, the periodic fluctuation is smaller, the resource reserves are rich, and the development conditions are superior.

In the prior art, ocean temperature difference energy development is to establish an ocean temperature difference energy power station to generate power so as to realize the utilization of temperature difference energy resources.

However, the power generation system structure design of the power station is limited, so that huge energy loss and temperature loss of cold and hot seawater pumping exist in the system, and particularly, the pressure head loss of a long-distance water pumping pipeline causes that the pipeline size of the system must be wide enough, so that high energy consumption operation cost exists in the system, and the power generation efficiency is low.

Disclosure of Invention

The invention provides a marine temperature difference energy power generation device and a marine temperature difference energy power generation system, which are used for realizing energy storage of a marine heat source, reducing energy consumption of the system and improving power generation efficiency.

According to an aspect of the present invention, there is provided an ocean thermal energy power generation device comprising: the device comprises a heat storage module, a submerged floating module and a thermoelectric generation module;

The heat storage module is connected between the submerged module and the thermoelectric generation module;

the heat storage module is used for storing heat of the surface layer of the hot seawater;

the submerged floating module is used for adjusting the buoyancy of the ocean temperature difference energy power generation device when the heat stored by the heat storage module reaches a first preset value, so as to realize submerged operation; the submerged floating module is also used for adjusting the buoyancy of the ocean temperature difference energy power generation device when the heat stored by the heat storage module reaches a second preset value, so as to realize floating operation;

the thermoelectric power generation module is used for generating power when the ocean thermoelectric power generation device is submerged to a first preset depth.

Optionally, the heat storage module comprises a heat storage chamber, a heat storage loop and a heat storage material; the temperature difference power generation module comprises a turbine, a gas-liquid separator, a working medium pump, a first one-way valve, a first control valve, a second control valve, a working medium and a heat exchange ring;

one end of the first one-way valve is connected with the heat storage loop; the other end of the first one-way valve is connected with the first control valve and the second control valve; the gas-liquid separator is connected between the first control valve and the turbine; one end of the heat exchange ring is connected with a working medium pump; the other end of the heat exchange ring is connected with a second control valve, a gas-liquid separator and a turbine; the heat storage material is stored in the heat storage chamber; working medium flows in the heat storage loop; the gas-liquid separator is used for separating liquid working medium and gaseous working medium and conveying the gaseous working medium into the turbine;

When the ocean temperature difference energy power generation device is positioned on the surface layer of hot sea water, the first control valve is controlled to be closed, the turbine is isolated, the second control valve is controlled to be opened, the working medium is heated after passing through the heat exchange ring, and the working medium pump flows through the heat storage loop to enable the heat storage material to absorb heat and expand.

Optionally, the submerged module comprises an energy accumulator, an outer oil crusty pancake, an inner oil tank, a first electromagnetic valve, a second one-way valve, a third one-way valve and transmission oil;

The first electromagnetic valve is connected between the outer oil crusty pancake and the energy accumulator; the second electromagnetic valve is connected between the outer oil crusty pancake and the inner oil tank; the second one-way valve is connected between the inner oil tank and the heat storage chamber; the third one-way valve is connected between the energy accumulator and the heat storage chamber; the transmission oil is stored in the heat storage chamber and the outer oil crusty pancake.

Optionally, when the heat of the heat storage chamber reaches a first preset value, the third one-way valve is controlled to be opened, transmission oil in the heat storage chamber enters the energy accumulator through the third one-way valve, the second electromagnetic valve is controlled to be opened, the transmission oil in the outer oil crusty pancake flows into the inner oil tank, the submerged module has negative buoyancy, and the ocean temperature difference energy generating device is controlled to realize submerged operation;

When the heat of the heat storage chamber reaches a second preset value, the second one-way valve is configured to be opened, transmission oil in the inner oil tank flows to the heat storage chamber, the first electromagnetic valve is configured to be opened, the transmission oil in the energy accumulator is pressed into the outer oil crusty pancake, the submerged module has positive buoyancy, and the ocean temperature difference energy generating device is controlled to realize floating operation.

Optionally, when the ocean temperature difference energy power generation device is submerged to a first preset depth, the working medium is liquefied;

The second control valve is configured to be closed, the first control valve is configured to be opened, the turbine is started, working medium in the heat exchange ring is pumped into the heat storage loop through the working medium pump, heat is released by the heat storage material, the working medium enters the gas-liquid separator after passing through the first one-way valve and the first control valve, and the separated gaseous working medium enters the turbine to generate electricity.

Optionally, the heat storage chamber comprises a first chamber and a second chamber;

the first chamber is used for storing transmission oil; the second chamber is used for storing heat storage materials;

the first chamber and the second chamber are mutually sealed and isolated, and the volumes of the first chamber and the second chamber are variable.

Optionally, the heat storage loop is clung to the second chamber and is used for realizing heat exchange between the working medium and the heat storage material;

the paths of the heat storage loop and the heat exchange ring comprise spiral or coil type;

The heat exchange ring is used for increasing the heat exchange area between the working medium and the seawater.

Optionally, the phase transition temperature of the thermal expansion of the heat storage material is lower than the perennial temperature of the surface layer hot sea water of the sea area and higher than the perennial temperature of the cold sea water of the first preset depth.

According to another aspect of the present invention, there is provided a marine thermal energy power generation system including an electricity storage device, a fixing device, and the marine thermal energy power generation device described above;

The ocean temperature difference energy power generation device is connected with the power storage device through a power transmission line; the fixing device is connected with the ocean temperature difference energy power generation device;

the power storage device is used for storing electric power resources generated after the ocean temperature difference energy power generation device generates power;

The fixing device is used for fixing the position of the ocean temperature difference energy generating device, so that the ocean temperature difference energy generating device works in a set sea area range.

Optionally, the power storage device comprises a power storage structure, a cable and a power transmission pipeline;

the power storage structure is positioned on the sea bottom; the cable is connected with the electric storage structure and the ocean temperature difference energy generating device through the power transmission pipeline, and electric power resources generated by the ocean temperature difference energy generating device are transmitted to the electric storage structure;

the fixing device comprises an anchoring structure and a fixing unit;

The fixing unit is connected with the anchoring structure and the ocean temperature difference energy power generation device;

the cable is attached to the fixing unit, and a length of the cable is greater than a length of the fixing unit.

According to the technical scheme, the ocean temperature difference energy power generation device comprises a heat storage module, a submerged floating module and a temperature difference power generation module, wherein the heat storage module is used for absorbing and storing heat of the surface layer of the seawater; the submerged floating module is used for adjusting the buoyancy of the ocean temperature difference energy power generation device when the heat stored by the heat storage module reaches a first preset value, so as to realize submerged operation; the submerged module is further used for adjusting the buoyancy of the ocean thermal energy power generation device to realize floating operation when the heat stored by the heat storage module reaches a second preset value, the submerged module is used for realizing in-situ extraction of energy through buoyancy change, system energy consumption is reduced, the thermal energy power generation module is used for generating power when the ocean thermal energy power generation device is submerged to a first preset depth, and power generation efficiency is improved.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a marine thermoelectric power generation device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a specific structure of a marine thermoelectric power generation device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a marine thermoelectric power generation system according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a specific structure of a marine thermoelectric power generation system according to an embodiment of the present invention.

In fig. 2: 11. a heat storage module; 12. a submerged floating module; 13. a thermoelectric generation module; 110. a heat storage chamber; 111. a heat storage circuit; 112. a heat storage material; 121. an accumulator; 122. an outer oil crusty pancake; 123. an inner oil tank; 124. a first electromagnetic valve; 125. a second electromagnetic valve; 126. a second one-way valve; 127. a third one-way valve; 128. transmission oil; 130. a turbine; 131. a gas-liquid separator; 132. a working medium pump; 133. a first one-way valve; 134. a first control valve; 135. a second control valve; 136. a heat exchange ring; 301. an electricity storage structure.

In fig. 4: 30. an electric storage device; 40. ocean temperature difference energy power generation device; 50. a fixing device; 301. an electricity storage structure; 302. a cable; 303. a power transmission line; 501. an anchor structure; 502. a fixing unit; 11. a heat storage module; 12. a submerged floating module; 13. a thermoelectric generation module; 136. a heat exchange ring.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Fig. 1 is a schematic structural diagram of a marine thermoelectric power generation device according to an embodiment of the present invention, as shown in fig. 1, the marine thermoelectric power generation device includes: a heat storage module 11, a submerged module 12 and a thermoelectric generation module 13; the heat storage module 11 is connected between the submerged module 12 and the thermoelectric generation module 13; the heat storage module 11 is used for storing heat of the surface layer of the hot seawater; the submerged module 12 is used for adjusting the buoyancy of the ocean temperature difference energy power generation device when the heat stored by the heat storage module 11 reaches a first preset value, so as to realize submerged operation; the submerged module 12 is further configured to adjust a buoyancy of the ocean thermal energy power generation device when the heat stored in the heat storage module 11 reaches a second preset value, so as to realize floating operation; the thermoelectric generation module 13 is used for generating electricity when the ocean thermoelectric generation device is submerged to a first preset depth.

In the embodiment of the invention, the energy obtained by the ocean surface layer mainly comes from short wave radiation of the sun and sky, heat transmitted to the sea surface by the atmosphere through turbulence, heat generated by water vapor condensation on the sea surface, vortex heat transmitted to the sea surface from the lower layer in the sea and heat brought by horizontal warm advection. The heat storage module 11 in the ocean temperature difference energy power generation device is used for absorbing heat of the hot sea water surface layer and storing the heat. The first preset value is a preset heat value stored in the heat storage module 11 that enables the ocean thermal energy power generation device to move downward in the vertical direction. The second preset value is a preset thermal value stored in the thermal storage module 11, which is realized by the ocean thermal energy power generation device to move upward in the vertical direction. The first preset value is greater than the second preset value.

When the ocean temperature difference energy power generation device is located in the heat absorption area of the sea water surface layer, the heat storage module 11 absorbs heat of the hot sea water surface layer and stores the heat in the heat storage module 11, when the heat stored in the heat storage module 11 reaches a first preset value, at the moment, due to the fact that heat storage materials in the heat storage module 11 absorb heat and expand, the ocean temperature difference energy power generation device has negative buoyancy, the ocean temperature difference energy power generation device moves downwards in the vertical direction, and submergence operation is achieved.

The first preset depth is the depth reached by the preset ocean thermal energy power generation device. Illustratively, in the south sea area, the cold source temperature of the ocean thermal energy generating device is between about 4 ℃ and about 6 ℃, and when the ocean thermal energy generating device is submerged to 800m, the thermal power generating module 13 generates power. In practical application, the first preset depth is required to be obtained according to the specific measurement of the actual sea area temperature. When the ocean thermal energy power generation device is submerged to the first preset depth, the thermal power generation module 13 acts to generate power. The thermoelectric generation module 13 is provided with different operation loops at different working stages, so that stable operation of the ocean thermoelectric power generation device is ensured.

The thermal energy stored in the heat storage module 11 is consumed when the thermal energy stored in the heat storage module 11 reaches a second preset value, and at the moment, due to solidification and shrinkage of the heat storage material in the heat storage module 11, the submerged module 12 enables the ocean thermal energy power generation device to have positive buoyancy, the ocean thermal energy power generation device moves upwards in the vertical direction, floating operation is achieved, and the ocean thermal energy power generation device floats to the position of the sea water surface for preparation of the next cycle.

According to the technical scheme, the ocean temperature difference energy power generation device comprises a heat storage module, a submerged floating module and a temperature difference power generation module, wherein the heat storage module is used for absorbing and storing heat of the surface layer of the seawater; the submerged floating module is used for adjusting the buoyancy of the ocean temperature difference energy power generation device when the heat stored by the heat storage module reaches a first preset value, so as to realize submerged operation; the submerged module is further used for adjusting the buoyancy of the ocean thermal energy power generation device to realize floating operation when the heat stored by the heat storage module reaches a second preset value, the submerged module can realize in-situ extraction of energy through buoyancy change, the energy consumption of the system is reduced, the thermal energy power generation module is used for generating power when the ocean thermal energy power generation device is submerged to a first preset depth, the power generation efficiency is improved, and stable operation of the system is ensured.

Fig. 2 is a schematic diagram of a specific structure of an ocean thermal energy power generation device according to an embodiment of the present invention, and as shown in fig. 2, a heat storage module 11 includes a heat storage chamber 110, a heat storage loop 111, and a heat storage material 112; the thermoelectric generation module 13 comprises a turbine 130, a gas-liquid separator 131, a working medium pump 132, a first check valve 133, a first control valve 134, a second control valve 135, a working medium and a heat exchange ring 136; one end of the first check valve 133 is connected with the heat storage circuit 111; the other end of the first check valve 133 is connected with a first control valve 134 and a second control valve 135; the gas-liquid separator 131 is connected between the first control valve 134 and the turbine 130; one end of the heat exchange ring 136 is connected with the working medium pump 132; the other end of the heat exchange ring 136 is connected with a second control valve 135, a gas-liquid separator 131 and a turbine 130; the heat storage material 112 is stored in the heat storage chamber 110; the heat storage loop 111 circulates the working medium inside; the gas-liquid separator 131 is used for separating liquid working medium and gaseous working medium and delivering the gaseous working medium into the turbine 130; when the ocean temperature difference energy generating device is positioned on the surface layer of hot sea water, the first control valve 134 is controlled to be closed, the turbine 130 is isolated, the second control valve 135 is controlled to be opened, the working medium is heated after passing through the heat exchange ring 136, and the working medium pump 132 flows through the heat storage loop 111 to enable the heat storage material 112 to absorb heat and expand.

In an embodiment of the present invention, turbine 130 is a machine that converts energy contained in a fluid working medium to mechanical energy, also known as a turbine or turbine. The gas-liquid separator 131 is a machine for separating gas and liquid, and the gas-liquid separator 131 can also be used for gas dust removal, oil-water separation, liquid impurity removal, and other occasions. One-way valves, also known as check valves or non-return valves, are directional control valves in which the flow of air can only flow in one direction but not in the opposite direction. The control valve is mainly composed of a valve body assembly and an actuating mechanism assembly. The heat exchange ring 136 is a high-efficiency heat exchange device, and the basic structure of the heat exchange ring is composed of a shell, a heat conduction tube bundle, an inlet, an outlet and the like, and the heat exchange principle is that cold and hot media respectively flow into an inner sleeve and an outer sleeve of the shell to flow oppositely, so that heat transfer and exchange are realized. The flow-through operating circuit of the working medium includes the heat storage circuit 111, the power generation circuit and the heat exchange ring 136. The gas-liquid separator 131 is used for separating liquid working media, ensuring that the liquid working media are all gaseous working media which are conveyed into the turbine 130, ensuring the power generation efficiency of the turbine 130 and prolonging the service life. If the gas-liquid separator 131 separates the liquid working medium, the working medium is conveyed to the heat exchange ring 136 through a pipeline for condensation and liquefaction.

When the ocean temperature difference energy power generation device is positioned on the surface layer of hot seawater, the heat storage module 11 stores the heat of the absorbed hot seawater surface layer, the first control valve 134 is controlled to be closed, the turbine 130 is isolated, the second control valve 135 is controlled to be opened, the heat absorption operation loop is opened, the working medium in the device is heated after passing through the heat exchange ring 136, the working medium with high temperature is pumped into the heat storage loop 111 through the working medium pump 132, so that the heat storage material 112 continuously absorbs heat, the volume of the heat storage material 112 expands after absorbing heat and melting, and when the heat storage material 112 expands to fill the whole heat storage chamber 110, the ocean temperature difference energy power generation device has negative buoyancy.

On the basis of the technical scheme of the embodiment of the invention, referring to the content shown in fig. 2, the submerged module 12 comprises an accumulator 121, an outer oil crusty pancake 122, an inner oil tank 123, a first electromagnetic valve 124, a second electromagnetic valve 125, a second one-way valve 126, a third one-way valve 127 and transmission oil 128; the first electromagnetic valve 124 is connected between the outer oil crusty pancake 122 and the accumulator 121; the second electromagnetic valve 125 is connected between the outer oil crusty pancake 122 and the inner oil tank 123; the second check valve 126 is connected between the inner oil tank 123 and the heat storage chamber 110; a third check valve 127 is connected between the accumulator 121 and the heat storage chamber 110; transmission oil 128 is stored in the heat storage chamber 110 and the outer oil crusty pancake 122.

In an embodiment of the invention, the accumulator 121 is an energy storage device in a hydro-pneumatic system. The inner tank 123 is a container for containing fuel. The electromagnetic valve is an electromagnetic control industrial device, is an automatic basic element for controlling fluid, and has the characteristics of safety, convenience and the like. The transmission oil 128 is an oil that transmits energy, and is used as a working medium in an automatic transmission constituted by a torque converter, a fluid coupling, and a mechanical transmission, and serves to transmit energy by means of kinetic energy of a fluid.

On the basis of the technical scheme of the embodiment of the invention, referring to fig. 2, when the heat of the heat storage chamber 110 reaches a first preset value, the third one-way valve 127 is controlled to be opened, the transmission oil 128 in the heat storage chamber 110 enters the accumulator 121 through the third one-way valve 127, the second electromagnetic valve 125 is controlled to be opened, the transmission oil 128 in the outer oil crusty pancake 122 flows into the inner oil tank 123, the submerged module 12 has negative buoyancy, and the ocean temperature difference energy power generation device is controlled to realize submerged operation; when the heat of the heat storage chamber 110 reaches the second preset value, the second one-way valve 126 is configured to be opened, the transmission oil 128 in the inner oil tank 123 flows to the heat storage chamber 110, the first electromagnetic valve 124 is configured to be opened, the transmission oil 128 in the accumulator 121 is pressed into the outer oil crusty pancake 122, the submerged module 11 has positive buoyancy, and the ocean thermal energy power generation device is controlled to realize floating operation.

In the embodiment of the present invention, when the heat of the heat storage chamber 110 reaches the first preset value, the heat storage material 112 absorbs heat and expands to fill the whole heat storage chamber 110, the transmission oil 128 in the compressed heat storage chamber 110 enters the accumulator 121 through the third one-way valve 127, and the second electromagnetic valve 125 communicated with the inner oil tank 123 is opened, so that the transmission oil 128 flows from the outer oil crusty pancake 122 to the inner oil tank 123 due to the fact that the atmospheric pressure is higher than the pressure in the device, and under the condition that the total mass of the device is unchanged, the volume is reduced, the submerged module 12 has negative buoyancy, and the ocean temperature difference energy power generation device is controlled to realize the submerged operation, and moves downwards from the heat absorption area to the condensation area.

The heat stored by the heat storage module 11 is consumed in the continuous thermoelectric power generation process, when the heat of the heat storage chamber 110 reaches a second preset value, the heat storage material 112 in the heat storage module 11 is solidified and then is volume contracted, the transmission oil 128 in the inner oil tank 123 flows to the heat storage module 11 through the second one-way valve 126, the energy accumulator 121 releases energy to open the first electromagnetic valve 124 communicated with the outer oil crusty pancake 122, the transmission oil 128 is pressed to the outer oil crusty pancake 122, the volume becomes large under the condition that the total mass of the device is unchanged, the submerged module 11 has positive buoyancy, and the whole structure of the ocean thermoelectric power generation device enters a floating stage, moves upwards from a condensation area to a heat absorption area and floats upwards to a sea surface position. After the ocean temperature difference energy generating device floats to the sea level, the water temperature of the sea level is higher than the phase change temperature of the heat storage material 112, so that the heat storage material 112 absorbs heat, melts and expands, and the transmission oil 128 flows to the energy accumulator 121 through the third one-way valve 127, thereby realizing energy storage and preparing for the next cycle.

In an embodiment of the present invention, the initial pressure of the accumulator 121 should be matched to the submergence depth of the ocean thermal energy generating device. The temperature of the cold sea water at the submerged depth of the ocean thermal power generation device should be lower than the phase transition temperature of the heat storage material 112, and meet the cold source temperature requirement of the thermal power generation module 13 for cyclic power generation. And the whole ocean temperature difference energy power generation device is in a negative pressure environment, and the internal pressure is slightly lower than the atmospheric pressure.

On the basis of the technical scheme of the embodiment of the invention, referring to the content shown in fig. 2, when the ocean thermal energy power generation device is submerged to a first preset depth, the working medium is liquefied; the second control valve 135 is configured to be closed, the first control valve 134 is configured to be opened, the turbine 130 is started, the working medium in the heat exchange ring 136 is pumped into the heat storage loop 111 through the working medium pump 132, the heat storage material 112 releases heat, the working medium passes through the first one-way valve 133 and the first control valve 134 and then enters the gas-liquid separator 131, and the separated gaseous working medium enters the turbine 130 to generate power.

In the embodiment of the present invention, when the ocean thermal energy power generation device is submerged to the first preset depth, for example, when the ocean thermal energy power generation device is submerged to 800m, the internal working medium is totally liquefied by cooling, the second control valve 135 is closed, the first control valve 134 is opened, the operation loop of the thermal power generation procedure is started, the turbine 130 is started, the liquid working medium in the heat exchange ring 136 is pumped into the heat storage loop 111 through the working medium pump 132, the heat storage material 112 in the heat storage module 11 releases heat, the working medium is gasified into a gaseous working medium after being heated, the gaseous working medium enters the gas-liquid separator 131 to perform a gas-liquid separation procedure, the pure gaseous working medium enters the turbine 130 to perform a power generation procedure, the turbine 130 is connected with the power storage structure 301, the generated electric quantity is transmitted to the power storage structure 301, the spent gas working medium after power generation enters the heat exchange ring 136 to perform heat exchange with deep cold seawater to realize condensation liquefaction of the working medium, and then the working medium pump 132 is pumped into the heat storage loop 111 to perform thermal gasification, and further continue the thermal power generation circulation operation.

On the basis of the technical solution of the embodiment of the invention, referring to fig. 2, the heat storage chamber 110 includes a first chamber and a second chamber; the first chamber is for storing transmission oil 128; the second chamber is for storing the heat storage material 112; the first chamber and the second chamber are mutually sealed and isolated, and the volumes of the first chamber and the second chamber are variable.

In the embodiment of the present invention, the inner part of the heat storage chamber 110 is divided into two chambers, namely a first chamber and a second chamber, the first chamber stores the transmission oil 128, the second chamber stores the heat storage material 112, the two chambers are sealed and isolated from each other, and the volume capacity of the chambers of the two chambers is variable, so that the volume of the second chamber expands after the heat storage material 112 absorbs heat and expands, and the transmission oil 128 of the first chamber is compressed to the accumulator 121.

On the basis of the technical scheme of the embodiment of the invention, referring to the content shown in fig. 2, the heat storage loop 111 is closely attached to the second chamber and is used for realizing heat exchange between the working medium and the heat storage material 112; the paths of the heat storage circuit 111 and the heat exchange ring 136 include spiral or coil type; heat exchange ring 136 serves to increase the heat exchange area between the working fluid and the seawater.

In the embodiment of the invention, the heat storage loop 111 is closely attached to the outside of the second chamber, and the working medium flows in the heat storage loop 111, so that the heat exchange between the working medium and the heat storage material 112 is realized. In the heat absorption stage, the high-temperature working medium provides heat for the solid heat storage material 112, so that the solid heat storage material is subjected to phase change heat storage; during the power generation phase, the high temperature heat storage material 112 provides heat to the liquid working medium, which is heated and gasified. The design path of the heat storage loop 111 may be spiral or disc-line, and the like, which is used to increase the heat exchange area between the working medium and the heat storage material 112 and improve the heat exchange efficiency. The heat exchange ring 136 is located at the top of the ocean thermal energy power generation device, and can be designed in various paths such as spiral or disc line type, etc. for increasing the heat exchange area between the working medium and the seawater and improving the heat exchange efficiency.

Based on the technical solution of the embodiment of the present invention, referring to fig. 2, the phase transition temperature of the thermal expansion of the heat storage material 112 is lower than the perennial temperature of the hot sea water on the surface layer of the sea area and higher than the perennial temperature of the cold sea water at the first preset depth.

In an embodiment of the present invention, the phase transition temperature is a temperature at which the phase transition of the heat storage material 112 occurs. The perennial temperature of the surface hot seawater in the sea area generally refers to the summer water temperature of the surface hot seawater in the sea area. Illustratively, the surface temperature of the sea water in the south-ocean-area in summer is 27-30 ℃. The perennial temperature of the cold seawater at the first preset depth is typically 4-6 ℃. The heat storage material 112 is selected to have a large solid-liquid phase variation rate. In addition, the volume change caused by the phase change process of the heat storage material 112 should be enough to change the overall net buoyancy of the ocean thermal energy power generation device, so as to ensure that the ocean thermal energy power generation device realizes the autonomous floating and submerging operation functions.

In the embodiment of the invention, the region division of the ocean temperature difference energy power generation device is mainly determined according to the temperature of the seawater. The area where the ocean thermal energy power generation device is located is mainly divided into a heat absorption area, a condensation area and an electric storage area according to the temperature difference of different depths of seawater.

According to the technical scheme, the ocean temperature difference energy power generation device is arranged based on the temperature difference between the sea surface and the sea bottom and combined with the phase change characteristic of the heat storage material, the buoyancy generated by the volume change of the heat storage material in the heat exchange process is utilized to drive the ocean temperature difference energy power generation device to move in the vertical direction, and the power generated after continuous circulation is stored or transmitted to a shore-based power grid through the power storage structure. The heat storage module realizes heat storage of the sea water surface layer. The submerged module realizes the autonomous floating and submerged position movement of the ocean temperature difference energy power generation device, and the temperature difference power generation module realizes the power generation utilization of ocean temperature difference resources. The in-situ extraction of energy is realized by a low-cost system displacement mode of buoyancy change, the energy consumption of the system is reduced, and the power generation efficiency is improved.

Fig. 3 is a schematic structural diagram of a marine thermoelectric power generation system according to an embodiment of the present invention. As shown in fig. 3, the ocean thermal energy power generation system includes: power storage device 30, fixing device 50, and ocean thermal energy power generation device 40 described above; the ocean temperature difference energy power generation device 40 is connected with the power storage device 30 through a power transmission line; the fixing device 50 is connected with the ocean temperature difference energy generating device 40; the electricity storage device 30 is used for storing electric power resources generated after the ocean temperature difference energy power generation device 40 generates electricity; the fixing device 50 is used for fixing the position of the ocean thermal energy generating device 40, so that the ocean thermal energy generating device 40 works within a set sea area.

In the embodiment of the invention, the ocean thermal energy power generation device 40 and the power storage device 30 are connected through a power transmission line. Illustratively, the ocean thermal energy power generation device 40 is connected to the power storage device 30 by a cable. The electric power resources generated by the ocean thermal energy power generation device 40 are stored by the electric power storage device 30. The fixing device 50 is used for fixing the position of the ocean thermal energy power generation device 40 so that the ocean thermal energy power generation device works within a set sea area range, and the system is not lost or other peripheral system works are not influenced by sea conditions. The internal structure of the ocean temperature difference energy power generation system is a high sealing structure, and the outside is made of corrosion resistant materials, and the structural performance of the system also needs to meet the requirements of deep sea operation parameters.

According to the technical scheme, the ocean temperature difference energy power generation system comprises the power storage device, the fixing device and the ocean temperature difference energy power generation device, the ocean temperature difference energy power generation device is connected with the power storage device through a power transmission line, the fixing device is connected with the ocean temperature difference energy power generation device, the structural design of the ocean temperature difference energy power generation system is simplified, a highly integrated structural mode is achieved, the size limitation of the ocean temperature difference energy power generation system is reduced, the development and utilization of ocean temperature difference energy resource benefits are achieved, and the industrialized development process of ocean temperature difference energy resources is promoted.

Fig. 4 is a schematic diagram of a specific structure of a marine thermoelectric power generation system according to an embodiment of the present invention. As shown in fig. 4, the power storage device 30 includes a power storage structure 301, a cable 302, and a power transmission line 303; the electrical storage structure 301 is located on the sea floor; the cable 302 is connected with the electricity storage structure 301 and the ocean thermal energy power generation device 40 through the power transmission pipeline 303, and transmits electric power resources generated by the ocean thermal energy power generation device 40 to the electricity storage structure 301; the fixing device 50 includes an anchor structure 501 and a fixing unit 502; the fixing unit 502 is connected with the anchoring structure 501 and the ocean thermal energy power generation device 40; the cable 302 is attached to the fixing unit 502, and the length of the cable 302 is greater than the length of the fixing unit 502.

In an embodiment of the present invention, cable 302 is a wire made of one or more mutually insulated conductors and an outer insulating protective layer. The power transmission line 303 is a power transmission device, and is a transmission line for transmitting a large amount of electric power. The power storage device 30 is used to store electric power resources generated after the power generation by the ocean thermal energy power generation device 40. The electricity storage structure 301 includes a storage battery, and the storage capacity design value of the storage battery is specifically comprehensively considered according to parameters such as the power generation capacity, the external consumption of power resources, and the transmission consumption of power resources of the ocean thermal energy power generation system. The power storage structure 301 is located on the sea floor, and a cable 302 is connected between the power storage structure and the thermoelectric generation module 13 to transmit electric power.

The fixing device 50 is composed of an anchor structure 501 and a fixing unit 502, the fixing unit 502 including a fixing rope. The cable 302 may be attached to a stationary rope and the length of the cable 302 should exceed the stationary rope and power is transferred to the storage structure 301 for storage via the subsea power transmission line 303. The anchoring rope assembly consisting of the anchoring structure 501 and the fixed rope of the single ocean temperature difference energy power generation system can be arranged to be more than three sets according to the sea conditions of specific sea areas, and the system displacement control can be uniformly carried out in multiple directions. The installation position of the subsea anchor structure 501 should be deep into the sea floor and a high density and heavy material is selected for preparation, ensuring the stability of the anchor line assembly. The installation positions of the fixed ropes are uniformly distributed in an annular mode at the bottom of the system, the fixed ropes are made of materials with high elasticity and high toughness, the length of the fixed ropes exceeds the depth from the seabed to the sea surface, a certain reasonable design allowance is provided, and the system is not influenced by the ropes in the floating and submerging processes.

On the basis of the technical solutions of the embodiments of the present invention, referring to fig. 2 and 3, the ocean thermal energy power generation system includes the power storage device 30, the fixing device 50 and the ocean thermal energy power generation device 40, and according to the working state of the ocean thermal energy power generation device 40, the working phases of the ocean thermal energy power generation system may be divided into an endothermic phase, a submerged phase, a power generation phase and an ascent phase. According to the working state of the ocean thermal energy power generation device 40 in the vertical direction, the ocean area where the ocean thermal energy power generation system is located can be divided into a heat absorption area, a condensation area and an electric storage area;

(1) In the heat absorption stage, the ocean temperature difference energy power generation device 40 is positioned on the hot sea water surface layer, the electric storage device 30 and the fixing device 50 are positioned on the sea bottom, the heat storage module 11 stores the heat of the absorbed hot sea water surface layer, the first control valve 134 is controlled to be closed, the isolating turbine 130 is controlled to be opened, the second control valve 135 is controlled to be opened, a heat absorption operation loop is opened, working mediums in the device are heated after passing through the heat exchange ring 136, high-temperature working mediums are pumped into the heat storage loop 111 through the working medium pump 132, so that the heat storage materials 112 continuously absorb heat, the volume of the heat storage materials 112 expand after absorbing heat, and the ocean temperature difference energy power generation system works in the heat absorption stage and is positioned in the heat absorption region;

(2) In the submerged stage, after the heat storage material 112 expands to fill the whole heat storage chamber 110, compressed transmission oil 128 enters the accumulator 121 through the third one-way valve 127, and the second electromagnetic valve 125 communicated with the inner oil tank 123 is opened, so that the transmission oil 128 flows from the outer oil crusty pancake 122 to the inner oil tank 123 due to the fact that the atmospheric pressure is higher than the pressure in the device, the volume is reduced under the condition that the total mass of the device is unchanged, the ocean temperature difference energy power generation device 40 has negative buoyancy, the submerged operation is realized, the electric storage device 30 and the fixing device 50 are positioned on the sea floor, and the ocean temperature difference energy power generation system works in the submerged stage and moves downwards from a heat absorption area to a condensation area;

(3) In the power generation stage, when the ocean thermal energy power generation device 40 is submerged to a first preset depth, and the ocean thermal energy power generation device is submerged to 800m, the internal working medium is totally liquefied by cooling, the second control valve 135 is closed, the first control valve 134 is opened, the operation loop of the thermal power generation procedure is started, the turbine 130 is started, the liquid working medium in the heat exchange ring 136 is pumped into the heat storage loop 111 through the working medium pump 132, the heat storage material 112 in the heat storage module 11 releases heat, the working medium is gasified into a gaseous working medium after being heated, the gaseous working medium enters the gas-liquid separator 131 to perform a gas-liquid separation procedure, the pure gaseous working medium enters the turbine 130 to perform the power generation procedure, the electric storage device 30 is positioned at the sea floor, a connecting cable between the electric storage device 30 and the turbine 130 is used for power transmission, the spent gas after power generation enters the heat exchange ring 136 to perform heat exchange with deep cold sea water to realize the condensation liquefaction of the working medium, and then the working medium pump 132 is pumped into the heat storage loop 111 for gasification, and the thermal gasification is further continuous in the temperature difference power generation circulation operation;

(4) The floating stage, the heat stored by the heat storage module 11 is consumed in the continuous thermoelectric power generation process, the volume of the heat storage material 112 in the heat storage module 11 is contracted after solidification, the transmission oil 128 in the inner oil tank 123 flows to the heat storage module 11 through the second one-way valve 126, the energy accumulator 121 releases energy to open the first electromagnetic valve 124 communicated with the outer oil crusty pancake 122, the transmission oil 128 is pressed to the outer oil crusty pancake 122, the volume is increased under the condition that the total mass of the system is unchanged, the submerged module 11 has positive buoyancy, the ocean thermoelectric power generation system enters the floating stage, and moves upwards from the condensation area to the heat absorption area to the sea surface position, and the electric storage device 30 and the fixing device 50 are positioned on the sea bottom;

After the ocean temperature difference energy power generation system floats to the sea level, the water temperature of the surface layer hot sea water is higher than the phase change temperature of the heat storage material 112, so that the heat storage material 112 absorbs heat, melts and expands, and the transmission oil 128 flows into the energy accumulator 121 to realize energy storage and prepare for the next cycle. By reasonably dividing the working stage of the ocean temperature difference energy power generation system and the ocean area where the ocean temperature difference energy power generation system is located, the benefit development and utilization of the ocean temperature difference energy resources can be realized, and the industrialization development process of the ocean temperature difference energy resources is promoted.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.

The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. An ocean thermal energy power generation device, comprising: the device comprises a heat storage module, a submerged floating module and a thermoelectric generation module;

the heat storage module is connected between the submerged floating module and the thermoelectric generation module;

The heat storage module is used for storing heat of the surface layer of the hot seawater;

The submerged module is used for adjusting the buoyancy of the ocean temperature difference energy power generation device when the heat stored by the heat storage module reaches a first preset value so as to realize submerged operation; the submerged module is also used for adjusting the buoyancy of the ocean temperature difference energy power generation device to realize floating operation when the heat stored by the heat storage module reaches a second preset value;

The thermoelectric power generation module is used for generating power when the ocean thermoelectric power generation device is submerged to a first preset depth.

2. The ocean thermal energy power plant of claim 1, wherein the heat storage module comprises a heat storage chamber, a heat storage circuit, and a heat storage material; the temperature difference power generation module comprises a turbine, a gas-liquid separator, a working medium pump, a first one-way valve, a first control valve, a second control valve, a working medium and a heat exchange ring;

One end of the first one-way valve is connected with the heat storage loop; the other end of the first one-way valve is connected with the first control valve and the second control valve; the gas-liquid separator is connected between the first control valve and the turbine; one end of the heat exchange ring is connected with the working medium pump; the other end of the heat exchange ring is connected with the second control valve, the gas-liquid separator and the turbine; the heat storage material is stored in the heat storage chamber; the working medium flows through the heat storage loop; the gas-liquid separator is used for separating liquid working medium and gaseous working medium and conveying the gaseous working medium into the turbine;

When the ocean temperature difference energy power generation device is positioned on the surface layer of the hot sea water, the first control valve is controlled to be closed, the turbine is isolated, the second control valve is controlled to be opened, the working medium is heated after passing through the heat exchange ring, and the working medium pump flows through the heat storage loop to enable the heat storage material to absorb heat and expand.

3. The ocean thermal energy power generation device of claim 2, wherein the submerged module comprises an accumulator, an outer oil crusty pancake, an inner oil tank, a first solenoid valve, a second check valve, a third check valve and transmission oil;

The first electromagnetic valve is connected between the outer oil crusty pancake and the energy accumulator; the second electromagnetic valve is connected between the outer oil crusty pancake and the inner oil tank; the second one-way valve is connected between the inner oil tank and the heat storage chamber; the third one-way valve is connected between the accumulator and the heat storage chamber; the transmission oil is stored in the heat storage chamber and the outer oil crusty pancake.

4. The ocean thermal energy power generation device according to claim 3, wherein when the heat of the heat storage chamber reaches the first preset value, the third one-way valve is controlled to be opened, transmission oil in the heat storage chamber enters the energy accumulator through the third one-way valve, the second electromagnetic valve is controlled to be opened, the transmission oil in the outer oil crusty pancake flows into the inner oil tank, the submerged floating module has negative buoyancy, and the ocean thermal energy power generation device is controlled to realize submerged operation;

When the heat of the heat storage chamber reaches the second preset value, the second one-way valve is configured to be opened, transmission oil in the inner oil tank flows to the heat storage chamber, the first electromagnetic valve is configured to be opened, the transmission oil in the energy accumulator is pressed into the outer oil crusty pancake, and the submerged module has positive buoyancy and controls the ocean temperature difference energy power generation device to realize floating operation.

5. The ocean thermal power plant of claim 2, wherein the working medium liquefies when the ocean thermal power plant is submerged to the first preset depth;

The second control valve is configured to be closed, the first control valve is configured to be opened, the turbine is started, the working medium in the heat exchange ring is pumped into the heat storage loop through the working medium pump, the heat storage material releases heat, the working medium passes through the first one-way valve and the first control valve and then enters the gas-liquid separator, and the separated gaseous working medium enters the turbine to generate electricity.

6. The ocean thermal energy power plant of claim 2 wherein the thermal storage chamber comprises a first chamber and a second chamber;

the first chamber is used for storing transmission oil; the second chamber is used for storing the heat storage material;

The first chamber and the second chamber are mutually sealed and isolated, and the volumes of the first chamber and the second chamber are variable.

7. The ocean thermal energy power plant of claim 6 wherein the thermal storage circuit is proximate the second chamber for effecting heat exchange between the working fluid and the thermal storage material;

the paths of the heat storage loop and the heat exchange ring comprise spiral or coiled wires;

the heat exchange ring is used for increasing the heat exchange area between the working medium and the seawater.

8. The ocean thermal power plant of claim 2, wherein the thermal expansion phase transition temperature of the thermal storage material is lower than the perennial temperature of the ocean surface layer hot seawater and higher than the perennial temperature of the first predetermined depth cold seawater.

9. A marine thermal energy power generation system, characterized by comprising an electric storage device, a fixing device and the marine thermal energy power generation device according to any one of claims 1-5;

the ocean temperature difference energy power generation device is connected with the power storage device through a power transmission line; the fixing device is connected with the ocean temperature difference energy power generation device;

The power storage device is used for storing power resources generated after the ocean temperature difference energy power generation device generates power;

The fixing device is used for fixing the position of the ocean temperature difference energy power generation device, so that the ocean temperature difference energy power generation device works in a set sea area range.

10. The ocean thermal energy power generation system of claim 9 wherein the electrical storage device comprises an electrical storage structure, an electrical cable, and a power transmission line;

the electricity storage structure is positioned on the sea floor; the cable is connected with the electric storage structure and the ocean temperature difference energy power generation device through the power transmission pipeline, and electric power resources generated by the ocean temperature difference energy power generation device are transmitted to the electric storage structure;

the fixing device comprises an anchoring structure and a fixing unit;

The fixing unit is connected with the anchoring structure and the ocean temperature difference energy power generation device;

the cable is attached to the fixing unit, and a length of the cable is greater than a length of the fixing unit.