An integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system

Abstract

The present invention discloses an ocean temperature difference energy power generation system with an integral fully submersible annular heat exchange cycle, which relates to the field of ocean temperature difference energy power generation technology, and comprises: a working fluid evaporator located in a first temperature sea area, an internal working fluid pipe and an external annular working fluid pipe covering the first temperature sea area, the transition temperature sea area, and the second temperature sea area, the working fluid evaporator is connected to a turbine; the external annular working fluid pipe is arranged outside the internal working fluid pipe, and the internal working fluid pipe and the external annular working fluid pipe are both provided with an internal channel for one-way communication and flow of fluid, and the exhausted working fluid after the turbine generates electricity and works passes through the upper part of the internal working fluid pipe, the lower part of the external annular working fluid pipe, the lower part of the internal working fluid pipe, the upper part of the external annular working fluid pipe, the working fluid evaporator, and finally returns to the turbine again. The present invention adopts an integrated structural design to facilitate the lowering and construction of the power generation system.

Description

Technical Field

[0001] The invention relates to the technical field of ocean temperature difference energy power generation, and in particular to an ocean temperature difference energy power generation system with an integral fully submersible annular space heat exchange cycle. Background Art

[0002] The ocean covers about 71% of the earth's surface, and contains huge and sustainable energy, including tidal energy, wave energy, ocean current energy, temperature difference energy, salinity difference energy and other different types of ocean energy. Through the rational development and utilization of these energy sources, the world's energy crisis and environmental pollution problems will be effectively alleviated. Studies have found that ocean temperature difference energy is a type of ocean energy with large reserves, the most stable energy, and continuous exploitation without weather restrictions. Its power generation equipment can be built on land shores or in marine areas, and has broad application prospects and development value, but it has not yet reached the level of industrialization.

[0003] The principle of ocean thermal power generation technology is to use the temperature difference between the surface and deep seawater to generate electricity. The surface hot seawater is used to heat certain low-boiling-point working fluids, so that the working fluids are heated and vaporized to drive the turbine to generate electricity. The exhausted working fluids after power generation are condensed under the action of deep cold seawater and become liquid working fluids again, realizing the function of cyclic power generation. At present, the experimental system research of ocean thermal power generation system mainly includes shore-based and floating system designs, both of which use the method of pumping hot and cold seawater to the shore or floating platform, and then heat exchange between seawater and working fluids to generate electricity cyclically. Limited by the overall system design and power station construction technology, compared with shore-based and floating system designs, there are fewer studies and system designs on fully submersible ocean thermal power generation systems. The main reason is that according to the structural design of the existing ocean thermal power generation system, due to the large number of scattered equipment in the system and the complex connection method between the equipment, if a fully submersible construction method is adopted, there are problems such as difficulty in underwater installation, high cost, and difficulty in maintenance. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system, which facilitates the lowering and construction of the power generation system by adopting an integrated structural design.

[0005] To achieve the above object, the present invention can be carried out by adopting the following technical solutions:

[0006] An integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system, comprising:

[0007] A working fluid evaporator located in the first temperature sea area, wherein the working fluid evaporator is connected to a turbine;

[0008] An internal working fluid pipe and an external annular working fluid pipe covering the first temperature sea area, the transition temperature sea area, and the second temperature sea area, wherein the external annular working fluid pipe is arranged outside the internal working fluid pipe, and both the internal working fluid pipe and the external annular working fluid pipe are provided with an internal channel for one-way communication and flow of fluid, wherein:

[0009] The exhausted working medium after the turbine generates electricity and performs work passes through the upper part of the inner working medium pipe, the lower part of the outer ring-type working medium pipe, the lower part of the inner working medium pipe, the upper part of the outer ring-type working medium pipe, the working medium evaporator in sequence, and finally returns to the turbine again;

[0010] At the lower part of the outer annular working medium pipe, the exhausted working medium exchanges heat with the seawater in the second temperature sea area to be condensed to form a liquid working medium;

[0011] In the upper part of the outer annular working medium pipe, the liquid working medium exchanges heat with the seawater in the transition temperature sea area, thereby absorbing heat to form a partially gaseous gas-liquid mixed working medium;

[0012] In the working medium evaporator, the gas-liquid mixed working medium exchanges heat with the seawater in the first temperature sea area to absorb heat and form a completely gaseous working medium, wherein the temperatures of the first temperature sea area, the transition temperature sea area, and the second temperature sea area decrease in sequence.

[0013] The above-mentioned overall fully submersible annular heat exchange cycle ocean temperature difference energy power generation system, further,

[0014] A barrier layer is provided in the middle of the inner working fluid tube to form the upper part of the inner working fluid tube and the lower part of the inner working fluid tube, and a barrier layer is provided in the middle of the outer ring-type working fluid tube to form the upper part of the outer ring-type working fluid tube and the lower part of the outer working fluid tube; wherein,

[0015] A communicating pipe is provided between the exhaust gas working medium outlet of the turbine and the upper part of the internal working medium pipe, and a first working medium pump is provided at the inner inlet end of the upper part of the internal working medium pipe;

[0016] A first one-way valve is provided on the communication channel between the upper portion of the inner working fluid pipe and the lower portion of the outer annular working fluid pipe;

[0017] A communication channel is provided between the lower portion of the outer annular working fluid pipe and the lower portion of the inner working fluid pipe, and a second working fluid pump is provided at the inner inlet end of the lower portion of the inner working fluid pipe;

[0018] A second one-way valve is provided on the communication channel between the lower portion of the inner working fluid pipe and the upper portion of the outer ring-type working fluid pipe.

[0019] The above-mentioned overall fully submersible annular heat exchange cycle ocean temperature difference energy power generation system, further,

[0020] The outer ring-type working fluid pipe located in the transition temperature sea area is wrapped with an energy storage insulation layer, and the energy storage insulation layer has a plurality of sections of energy storage insulation bodies arranged at intervals along the axial direction of the outer ring-type working fluid pipe.

[0021] The above-mentioned overall fully submersible annular heat exchange cycle ocean temperature difference energy power generation system, further,

[0022] The working fluid evaporator comprises:

[0023] a central tube body having a central through hole and connected to an upper portion of the inner working fluid tube;

[0024] an external spiral heat exchange tube, which is wound around the central tube body in a predetermined spiral manner; and

[0025] A fixed support structure is used to connect the external spiral heat exchange tube to the central tube body.

[0026] The above-mentioned integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system further includes: a low-velocity ocean current energy power generation device for supplying energy to a specific device in the power generation system, and the low-velocity ocean current energy power generation device includes:

[0027] The primary energy capture stage is used to capture the energy stored in the ocean currents;

[0028] An energy transmission link, which is used to transfer the captured energy; and

[0029] The energy management supply link is used to manage, store and distribute the captured energy.

[0030] The ocean temperature difference energy power generation system with an integral fully submersible annular heat exchange cycle as described above, further, the low flow rate ocean current energy power generation equipment is installed at the bottom of the lower part of the external annular working fluid pipe, and the low flow rate ocean current energy power generation equipment is connected to the second working fluid pump through a power transmission pipeline for supplying power to the second working fluid pump.

[0031] In the above-mentioned integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system, further, the first working fluid pump is a gas-liquid mixing pump with a pressure higher than the set pressure, and the second working fluid pump is a submersible pump with a pressure higher than the set pressure.

[0032] The ocean temperature difference energy power generation system with an integral fully submersible annular heat exchange cycle as described above, further, the spiral form of the external spiral heat exchange tube includes any one of an equidistant spiral curve and an Archimedean spiral curve.

[0033] In the above-mentioned integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system, further, the tube body structure of the external spiral heat exchange tube includes any one of cylindrical, flat elliptical or thin rectangular.

[0034] The overall fully submersible annular heat exchange cycle ocean temperature difference energy power generation system as described above, further, the range of the first temperature sea area includes the area from sea level to a depth of 100m below sea level; the range of the transition temperature sea area includes the area from a depth of 100m to a depth of 700m below sea level; the range of the second temperature sea area includes the area from a depth of 700m to a depth of 1000m below sea level.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The overall fully submersible annular heat exchange cycle ocean temperature difference energy power generation system adopts an integrated structural design to realize the overall fully submersible system design of the ocean temperature difference energy power generation system, which is conducive to the lowering of the ocean temperature difference energy power generation system, greatly reducing the difficulty of underwater assembly of the power generation system and the difficulty of component maintenance of the power generation system;

[0037] 2. The overall fully submersible annular heat exchange cycle ocean temperature difference energy power generation system adopts the working fluid circulation method, which can directly realize the in-situ heat exchange and bidirectional circulation of the working fluid through the internal working fluid pipe and the external annular working fluid pipe, which is conducive to improving the heat exchange efficiency, reducing the power consumption cost of the system operation, and simplifying the system structure;

[0038] 3. The overall fully submersible annular heat exchange cycle ocean temperature difference energy power generation system adopts the Archimedean spiral curve working fluid evaporator heat exchange tube structure design. By fully considering the morphological changes and volume expansion of the liquid working fluid to form a gaseous working fluid after heating, the diameter size of the heat exchange tube is designed to gradually increase with the seawater temperature and the working fluid heating conditions, and the input flow rate and input amount of the preheated but not completely vaporized gas-liquid mixed working fluid are controlled to ensure the stability of the power generation cycle process after the working fluid is heated and vaporized;

[0039] 4. The overall fully submersible annular heat exchange cycle ocean temperature difference energy power generation system adopts low-velocity ocean current energy power generation equipment. By combining the utilization of other ocean energy, it provides operating electricity for the second working fluid pump located in the deep sea, effectively solving the kinetic energy requirements of deep-sea equipment and realizing the combined utilization of multiple ocean energies. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 It is a structural schematic diagram of an ocean temperature difference energy power generation system of an integral fully submersible annular heat exchange cycle according to an embodiment of the present invention;

[0042] Figure 2 It is a schematic diagram of the inlet and outlet of each device of the working medium cycle of an ocean temperature difference energy power generation system of an integral fully submersible annular heat exchange cycle according to an embodiment of the present invention;

[0043] Figure 3 It is a partial structural schematic diagram of a working fluid evaporator of an ocean temperature difference energy power generation system of an integral fully submersible annular heat exchange cycle according to an embodiment of the present invention;

[0044] Figure 4 It is a schematic diagram of the structural modules of a low-velocity ocean current energy power generation device of an ocean temperature difference energy power generation system with an integral fully submersible annular space heat exchange cycle according to an embodiment of the present invention.

[0045] Among them: 1. turbine; 2. working fluid evaporator; 2-1. central tube body; 2-2. external spiral heat exchange tube; 2-3. fixed support structure; 3. first working fluid pump; 4. upper part of internal working fluid tube; 5. upper part of external annular working fluid tube; 6. energy storage insulation layer; 7. first one-way valve; 8. second one-way valve; 9. lower part of internal working fluid tube; 10. lower part of external annular working fluid tube; 11. second working fluid pump; 12. low flow Sea current energy power generation equipment; A-1, turbine inlet; A-2, turbine outlet; B-1, first working fluid pump inlet; B-2, first working fluid pump outlet; C-1, first check valve inlet; C-2, first check valve outlet; D-1, second working fluid pump inlet; D-2, second working fluid pump outlet; E-1, second check valve inlet; E-2, second check valve outlet; F-1, working fluid evaporator inlet; F-2, working fluid evaporator outlet. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] Example:

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of the embodiments of the present invention are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0049] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise clearly defined. In addition, unless otherwise clearly defined and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] See also Figures 1 to 4The overall fully submersible annular heat exchange circulation ocean temperature difference energy power generation system of the present invention adopts an integrated structural design, which can realize the overall fully submersible system design of the ocean temperature difference energy power generation system, which is conducive to the lowering of the ocean temperature difference energy power generation system, greatly reducing the difficulty of underwater assembly of the power generation system and reducing the difficulty of component maintenance of the power generation system. In addition, the power generation system adopts the working fluid circulation method, which can directly realize the in-situ heat exchange of the working fluid and the bidirectional circulation of the working fluid through the internal working fluid pipe and the external annular working fluid pipe, which is conducive to improving the heat exchange efficiency, reducing the power consumption cost of the system operation and simplifying the structure of the system.

[0053] See also Figure 1 , an ocean temperature difference energy power generation system with an integral fully submersible annular heat exchange cycle, comprising: a working fluid evaporator 2, an internal working fluid pipe and an external annular working fluid pipe, the working fluid evaporator 2 is located in a first temperature sea area, and the working fluid evaporator 2 is connected to a turbine 1; the internal working fluid pipe and the external annular working fluid pipe cover the first temperature sea area, the transition temperature sea area and the second temperature sea area, the external annular working fluid pipe is arranged outside the internal working fluid pipe, and the internal working fluid pipe and the external annular working fluid pipe are both provided with an internal channel for unidirectional communication and flow of fluid, wherein the exhausted working fluid after the turbine 1 generates electricity and does work passes through the upper part 4 of the internal working fluid pipe, the lower part 10 of the external annular working fluid pipe, the lower part 9 of the internal working fluid pipe, the upper part 5 of the external annular working fluid pipe, the working fluid evaporator 2 in sequence, and finally returns to the turbine 1 again. In the lower part 10 of the external annular working medium pipe, the exhausted working medium exchanges heat with the seawater in the second temperature sea area to condense and form a liquid working medium; in the upper part 5 of the external annular working medium pipe, the liquid working medium exchanges heat with the seawater in the transition temperature sea area to absorb heat and form a partially gaseous gas-liquid mixed working medium. In the working medium evaporator 2, the gas-liquid mixed working medium exchanges heat with the seawater in the first temperature sea area to absorb heat and form a completely gaseous working medium, wherein the temperatures of the first temperature sea area, the transition temperature sea area, and the second temperature sea area decrease in sequence.

[0054] In this embodiment, the power generation cycle of this power generation system is as follows: the exhaust gas working medium after the turbine 1 generates power is pumped into the upper part 4 of the internal working medium pipe under the action of the first working medium pump 3, and then enters the lower part 10 of the external annular working medium pipe through the communication channel between the upper part 4 of the internal working medium pipe and the lower part 10 of the external annular working medium pipe. The exhaust gas working medium fully exchanges heat with the deep cold seawater in the cold seawater area of ​​the lower part 10 of the external annular working medium pipe, and then the exhaust gas working medium condenses to form a liquid working medium, and enters the lower part 9 of the internal working medium pipe from the connection between the lower part 10 of the external annular working medium pipe and the lower part 9 of the internal working medium pipe. In addition, the liquid working medium enters the upper part 5 of the external annular working medium pipe through the communication channel between the lower part 9 of the internal working medium pipe and the upper part 5 of the external annular working medium pipe under the action of the second working medium pump 11. The liquid working medium first fully exchanges heat with the hot seawater in the hot seawater area of ​​the upper part 5 of the external annular working medium pipe. The fully preheated gas-liquid mixed working medium enters the external spiral heat exchange tube 2-2 from the connecting pipe between the upper part 5 of the external annular working medium pipe and the working medium evaporator 2. The gas-liquid mixed working medium is further heated by the highest temperature surface hot seawater, which causes the gas-liquid mixed working medium to be heated and vaporized to form gaseous working medium. Finally, the gaseous working medium enters the turbine 1 from the outlet of the external spiral heat exchange tube 2-2 of the working medium evaporator 2 to drive power generation, and the exhausted working medium after power generation enters the upper part 4 of the internal working medium pipe for the next round of circulation.

[0055] As an optional implementation, in some embodiments, a barrier layer is provided in the middle of the internal working fluid pipe to form an upper part 4 of the internal working fluid pipe and a lower part 9 of the internal working fluid pipe, and a barrier layer is provided in the middle of the external ring-type working fluid pipe to form an upper part 5 of the external ring-type working fluid pipe and a lower part 9 of the internal working fluid pipe; a connecting pipe is provided between the exhaust gas working fluid outlet of the turbine 1 and the upper part 4 of the internal working fluid pipe, and a first working fluid pump 3 is provided at the inlet; a first one-way valve 7 is provided on the connecting passage between the upper part 4 of the internal working fluid pipe and the lower part 10 of the external ring-type working fluid pipe; a connecting passage is provided between the lower part 10 of the external ring-type working fluid pipe and the lower part 9 of the internal working fluid pipe, and a second working fluid pump 11 is provided at the internal inlet end of the lower part of the internal working fluid pipe; a second one-way valve 8 is provided on the connecting passage between the lower part 9 of the internal working fluid pipe and the upper part 5 of the external ring-type working fluid pipe.

[0056] Specifically, the internal working fluid pipe and the external annular working fluid pipe run through the entire ocean area, and have a barrier layer in the middle of the transition zone, that is, the internal working fluid pipe and the external annular working fluid pipe can be divided into two upper and lower parts, specifically an upper part 4 of the internal working fluid pipe, a lower part 9 of the internal working fluid pipe, an upper part 5 of the external annular working fluid pipe, and a lower part 10 of the external annular working fluid pipe; the upper part 4 of the internal working fluid pipe and the upper part 5 of the external annular working fluid pipe are located in the hot sea water area and the upper part of the transition zone, and the lower part 9 of the internal working fluid pipe and the lower part 10 of the external annular working fluid pipe are located in the lower part of the transition zone and the cold sea water area.

[0057] The first working fluid pump 3 adopts an existing high-pressure resistant gas-liquid mixing pump, which has the ability to pump the gas-liquid mixed working fluid. The second working fluid pump 11 adopts an existing high-pressure resistant submersible pump, which has the ability to pump while immersed in the working fluid. The first one-way valve 7 is located at the communication channel between the upper part 4 of the internal working fluid pipe and the lower part 10 of the external annular working fluid pipe, and the second one-way valve 8 is located at the communication channel between the lower part 9 of the internal working fluid pipe and the upper part 5 of the external annular working fluid pipe, which is mainly used to control the movement direction of the working fluid and ensure that the working fluid is transmitted according to the path of the system circulation.

[0058] As an optional implementation, in some embodiments, the outer ring-type working fluid pipe located in the transition temperature sea area is wrapped with an energy storage insulation layer 6, and the energy storage insulation layer 6 has a plurality of sections of energy storage insulation bodies arranged at intervals along the axial direction of the outer ring-type working fluid pipe.

[0059] In this embodiment, the upper part 5 of the external annular working fluid pipe and the lower part 10 of the external annular working fluid pipe are wrapped with an energy storage insulation layer 6 on the periphery of the structure located in the transition zone area, and the energy storage insulation layer 6 is wrapped in sections. According to the actual working conditions of the project, the overall transition zone is divided into several sections according to depth, and the energy storage insulation layer 6 in each section is not connected, which can ensure that the temperature is close to that of the sea area at that depth.

[0060] See also Figure 3 As an optional embodiment, in some embodiments, the working fluid evaporator 2 includes: a central tube body 2-1, an external spiral heat exchange tube 2-2 and a fixed support structure 2-3, the central tube body 2-1 has a central through hole and is connected to the upper part 4 of the internal working fluid tube; the external spiral heat exchange tube 2-2 is wound around the central tube body 2-1 in a set spiral manner; the fixed support structure 2-3 is used to connect the external spiral heat exchange tube 2-2 to the central tube body 2-1.

[0061] Specifically, the main body of the working fluid evaporator 2 is divided into three parts, including a central tube body 2-1, an external spiral heat exchange tube 2-2, and a fixed support structure 2-3 connecting the heat exchange tube and the central tube body 2-1. The working fluid evaporator 2 adopts a method in which the working fluid is inside the heat exchange tube and directly exchanges heat with the hot seawater through the outside. The external heat exchange tube is distributed in a spiral manner, which can increase the heat exchange area between the working fluid in the tube and the hot seawater and improve the heat exchange effect; wherein, the central tube body 2-1 is a central through hole for penetrating the upper part 4 structure of the internal working fluid tube and is fixed on the internal working fluid tube; the spiral method of the external spiral heat exchange tube 2-2 can be a conventional equidistant spiral curve or an Archimedean spiral curve. Under the condition that the preparation process technology is satisfied, the Archimedean spiral curve can be preferred, which adopts a structure in which the inner diameter of the spiral at the lower end is small and the diameter of the tube body is small, and the inner diameter of the spiral at the upper end is large and the diameter of the tube body is large. The lower end hot seawater temperature is fully considered to be lower, and the inflow of the preheated gas-liquid mixed working medium is controlled to be kept at a small state. The upper end hot seawater temperature is higher, and the preheated working medium flowing in uniformly can achieve sufficient heat absorption. The volume of the working medium increases after gasification. Considering that the large diameter of the tube body is conducive to the outflow of the gaseous working medium. In addition, the tube body structure of the heat exchange tube can be cylindrical, flat elliptical or thin rectangular. According to the level of the preparation process technology, a tube body structure with a large heat exchange contact area is preferred. The fixed support structure 2-3 connecting the heat exchange tube and the central tube body 2-1, in order to maximize the contact area between the hot seawater and the working medium and improve the heat exchange efficiency, the heat exchange tube of the working medium evaporator 2 is designed to be distributed around the central tube body 2-1 in a suspended manner, and a fixed support structure 2-3 is used to achieve structural stability between the heat exchange tube and the central tube body 2-1.

[0062] In addition, since the seawater temperature within a depth of 10m below the sea level in the surface hot seawater area is basically unchanged and relatively stable, while the seawater temperature within a depth of 50m below the sea level drops by about 3°C; the depth size of the working fluid evaporator 2 can be prepared according to the level of the preparation process technology and the actual working conditions. Taking the Archimedean spiral curve as an example, considering that the seawater temperature within a depth of 10m below the sea level is a relatively high area, it can be set as the setting position of the upper spiral heat exchange tube. Through the heat exchange tube with a large inner diameter and a large tube body diameter, the working fluid can further fully absorb heat from the hot seawater to ensure complete vaporization of the working fluid; considering that the seawater temperature within a depth of 10m to 50m below the sea level is relatively low, it can be set as the setting position of the lower spiral heat exchange tube. Through the heat exchange tube with a small inner diameter and a small tube body diameter, the input flow rate and input amount of the preheated but not completely vaporized gas-liquid mixed working fluid can be controlled to ensure the stability of the power generation cycle process after the working fluid is heated and vaporized.

[0063] See also Figure 4As an optional implementation, in some embodiments, it also includes a low-velocity ocean current energy power generation device 12 for supplying energy to specific equipment in the power generation system. The low-velocity ocean current energy power generation device 12 includes: a primary energy capture link, an energy transmission link, and an energy management and supply link. The primary energy capture link is used to capture the energy contained in the ocean current; the energy transmission link is used to transmit the captured energy; the energy management and supply link is used to manage, store and distribute the captured energy.

[0064] In this embodiment, the low-velocity ocean current energy power generation equipment 12 can decompose the overall structure into a primary energy capture link, an energy transmission link, and an energy management and supply link; the primary energy capture link mainly realizes the capture of ocean current energy by rotating the impeller under the action of the ocean current, and the use of an impeller with excellent performance can ensure high energy capture efficiency. The energy transmission link mainly transmits the energy captured by the impeller. The transmission link should have the characteristics of low damping, high reliability and convenience of the system, so as to ensure that it meets the operating characteristics of low flow rates, thereby ensuring that the unit can operate for a long time, ensuring that the cost can be effectively controlled and reducing the difficulty of maintenance. The energy management and supply link mainly strictly controls the optimal charging and discharging rules of the power generation system through the battery to ensure that the battery is not overcharged or over-discharged.

[0065] In the above embodiment, further, the low-velocity ocean current energy power generation device 12 is installed at the bottom of the lower part 10 of the outer annular working fluid pipe, and is connected to the second working fluid pump 11 through a power transmission pipeline.

[0066] Specifically, the low-velocity ocean current energy power generation equipment 12 adopts an integrated structural design and is installed and fixed at the bottom of the lower part 10 of the external annular working fluid pipe. The electric energy generated by its work is used to provide kinetic energy to the second working fluid pump 11 located in the lower part 9 structure of the internal working fluid pipe, thereby effectively solving the kinetic energy requirements of deep-sea equipment and realizing the combined utilization of multiple ocean energies.

[0067] As an optional implementation, in some embodiments, the range of the first temperature sea zone includes the area from sea level to a depth of 100m below sea level; the range of the transition temperature sea zone includes the area from a depth of 100m to a depth of 700m below sea level; the range of the second temperature sea zone includes the area from a depth of 700m to a depth of 1000m below sea level.

[0068] In this embodiment, the first temperature sea area is a hot sea water area, and the hot sea water area ranges from the sea level to the area 100m below the sea level. Since the sea water is exposed to the sun for many years, it absorbs a large amount of heat energy, and thus can be used for the heating process of the working fluid. The equipment located in the hot sea water area mainly includes a turbine 1, a working fluid evaporator 2, a first working fluid pump 3, a first non-return valve 7, an upper portion 4 of an internal working fluid pipe, and an upper portion 5 of an external annular working fluid pipe.

[0069] The range of the transition temperature sea area is from 100m to 700m below sea level. Since the temperature of the seawater in this area is not enough to completely vaporize the liquid working medium or completely liquefy the gaseous working medium, its main function is to realize the working medium transmission between the hot seawater area and the cold seawater area, and to realize the cooling of a small amount of exhaust gas working medium and the heating of liquid working medium during the transportation process. During the transportation process, the exhaust gas working medium is pumped downward into the internal working medium pipe, and the liquid working medium is input upward into the external annular working medium pipe, and the temperature of the exhaust gas working medium in the internal working medium pipe and the external energy storage insulation layer 6 is higher than that of the liquid working medium in the external annular working medium pipe, and heat exchange can be performed together, thereby realizing the effect of gradually cooling the exhaust gas working medium and gradually heating the liquid working medium during the transportation process. The equipment located in the transition temperature sea area mainly includes the upper part 4 of the internal working medium pipe, the upper part 5 of the external annular working medium pipe, the lower part 9 of the internal working medium pipe and the lower part 10 of the external annular working medium pipe.

[0070] The second temperature sea area is a cold seawater area, which is in the range of 700m to 1000m below sea level. Since the cold seawater keeps a low temperature all year round, it can be used for the condensation process of the working fluid. The equipment located in the cold seawater area mainly includes a second working fluid pump 11, a second one-way valve 8, a lower part 9 of the internal working fluid pipe, a lower part 10 of the external annular working fluid pipe, and a low-velocity sea current energy power generation device 12; the second working fluid pump 11 and the second one-way valve 8 are located in the lower part 9 of the internal working fluid pipe, and are used to push the condensed liquid working fluid to the upper part 5 of the external annular working fluid pipe.

[0071] In addition, since the seawater temperature in the cold seawater area changes very little with depth, a complex working fluid condenser device is not set up in the deep sea area, and a long-distance external ring-type working fluid pipe is directly established to allow the exhausted working fluid to directly exchange heat with the external cold seawater during the process of flowing through the long-distance external ring-type working fluid pipe and entering the lower part 9 of the internal working fluid pipe, so that the exhausted working fluid is fully condensed into a liquid working fluid.

[0072] In order to better understand the present invention, the implementation steps of the power generation system are described below:

[0073] See also Figure 1-Figure 4First, it is assumed that the external spiral heat exchange tube 2-2 of the working fluid evaporator 2 of the power generation system adopts the structural design of the Archimedean spiral curve, the inner diameter of the spiral at the lower end is small and the tube body diameter is small, and the inner diameter of the spiral at the upper end is large and the tube body diameter is large; it is assumed that a sea area suitable for power generation of the ocean temperature difference energy system is selected, and the range from sea level to 100m below sea level is set as the hot sea water area, and a turbine 1, a working fluid evaporator 2, a first working fluid pump 3, a first one-way valve 7, an upper part 4 of the internal working fluid pipe, an upper part 5 of the external ring-type working fluid pipe and other structures are arranged; the sea level is set The range from a depth of 100m to a depth of 700m below the surface is the transition zone area, where the upper part 4 of the internal working fluid pipe, the upper part 5 of the external annular working fluid pipe, the lower part 9 of the internal working fluid pipe and the lower part 10 of the external annular working fluid pipe, as well as the energy storage insulation layer 6 wrapped around the periphery are arranged; the range from a depth of 700m to a depth of 1000m below the sea level is set as the cold seawater area, where the second working fluid pump 11, the second one-way valve 8, the lower part 9 of the internal working fluid pipe, the lower part 10 of the external annular working fluid pipe and the low-velocity ocean current energy power generation equipment 12 and other structures are arranged.

[0074] The operation process of the power generation system is as follows: the first round of heated and vaporized gaseous working medium enters the turbine 1 from the turbine inlet A-1 to drive the power generation and work, and the exhausted working medium after the power generation is completed enters the upper part 4 of the internal working medium pipe through the turbine outlet A-2; then, under the action of the first working medium pump 3, it is transported through the first working medium pump inlet B-1 and the first working medium pump outlet B-2, and enters the lower end position of the upper part 4 of the internal working medium pipe. After the heat exchange effect during the long-distance transportation process, the working medium at this position belongs to the exhausted working medium after cooling; then, under the action of the first one-way valve 7, it enters the connecting channel between the upper part 4 of the internal working medium pipe and the lower part 10 of the external annular working medium pipe through the first one-way valve inlet C-1, and enters the lower part 10 of the external annular working medium pipe from the first one-way valve outlet C-2; the exhausted working medium after cooling is fully condensed in the lower part 10 of the external annular working medium pipe, fully exchanges heat with the cold seawater, is cooled to form a liquid working medium, and is discharged from the external annular working medium pipe. The connecting passage between the lower part 10 of the working fluid pipe and the lower part 9 of the internal working fluid pipe enters the lower part 9 of the internal working fluid pipe; then, under the action of the second working fluid pump 11, the liquid working fluid is pumped into the upper end position of the lower part 9 of the internal working fluid pipe through the transportation of the second working fluid pump inlet D-1 and the second working fluid pump outlet D-2; then, under the action of the second one-way valve 8, the liquid working fluid enters the connecting passage between the lower part 9 of the internal working fluid pipe and the upper part 5 of the external annular working fluid pipe through the second one-way valve inlet E-1, and enters the upper part 5 of the external annular working fluid pipe from the second one-way valve outlet E-2; then, due to the heat exchange effect of the liquid working fluid in the upper part 5 of the external annular working fluid pipe during long-distance transportation, the preheated liquid working fluid enters the external spiral heat exchange tube 2-2 of the working fluid evaporator 2 from the working fluid evaporator inlet F-1, fully exchanges heat with the hot seawater, is heated to form a gaseous working fluid, and enters the turbine inlet A-1 from the working fluid evaporator outlet F-2 for a new round of cyclic power generation.

[0075] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. 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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0076] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable ordinary technicians in the field to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made based on the essence of the content of the present invention should be included in the protection scope of the present invention.

Claims

1. An integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system, comprising a working fluid evaporator located in a first temperature sea area, the working fluid evaporator is connected to a turbine, and is characterized in that: Also includes: An internal working fluid pipe and an external annular working fluid pipe covering the first temperature sea area, the transition temperature sea area, and the second temperature sea area, wherein the external annular working fluid pipe is arranged outside the internal working fluid pipe, and both the internal working fluid pipe and the external annular working fluid pipe are provided with an internal channel for one-way communication and flow of fluid, wherein: The exhausted working medium after the turbine generates electricity and performs work passes through the upper part of the inner working medium pipe, the lower part of the outer ring-type working medium pipe, the lower part of the inner working medium pipe, the upper part of the outer ring-type working medium pipe, the working medium evaporator in sequence, and finally returns to the turbine again; At the lower part of the outer annular working medium pipe, the exhausted working medium exchanges heat with the seawater in the second temperature sea area to be condensed to form a liquid working medium; In the upper part of the outer annular working medium pipe, the liquid working medium exchanges heat with the seawater in the transition temperature sea area, thereby absorbing heat to form a partially gaseous gas-liquid mixed working medium; In the working medium evaporator, the gas-liquid mixed working medium exchanges heat with the seawater in the first temperature sea area to absorb heat and form a completely gaseous working medium, wherein the temperatures of the first temperature sea area, the transition temperature sea area, and the second temperature sea area decrease in sequence.

2. The integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system according to claim 1 is characterized in that: A barrier layer is provided in the middle of the inner working fluid tube to form the upper part of the inner working fluid tube and the lower part of the inner working fluid tube, and a barrier layer is provided in the middle of the outer ring-type working fluid tube to form the upper part of the outer ring-type working fluid tube and the lower part of the outer working fluid tube; wherein, A communicating pipe is provided between the exhaust gas working medium outlet of the turbine and the upper part of the internal working medium pipe, and a first working medium pump is provided at the inner inlet end of the upper part of the internal working medium pipe; A first one-way valve is provided on the communication channel between the upper portion of the inner working fluid pipe and the lower portion of the outer annular working fluid pipe; A communication channel is provided between the lower portion of the outer annular working fluid pipe and the lower portion of the inner working fluid pipe, and a second working fluid pump is provided at the inner inlet end of the lower portion of the inner working fluid pipe; A second one-way valve is provided on the communication channel between the lower portion of the inner working fluid pipe and the upper portion of the outer ring-type working fluid pipe.

3. The integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system according to claim 1 is characterized in that: The outer ring-type working fluid pipe located in the transition temperature sea area is wrapped with an energy storage insulation layer, and the energy storage insulation layer has a plurality of sections of energy storage insulation bodies arranged at intervals along the axial direction of the outer ring-type working fluid pipe.

4. The integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system according to claim 1 is characterized in that: The working fluid evaporator comprises: a central tube body having a central through hole and connected to an upper portion of the inner working fluid tube; an external spiral heat exchange tube, which is wound around the central tube body in a predetermined spiral manner; and A fixed support structure is used to connect the external spiral heat exchange tube to the central tube body.

5. The integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system according to claim 2 is characterized in that: Also includes: A low-velocity ocean current energy power generation device for supplying energy to the equipment in the power generation system, the low-velocity ocean current energy power generation device comprising: The primary energy capture stage is used to capture the energy stored in the ocean currents; An energy transmission link, which is used to transfer the captured energy; and The energy management supply link is used to manage, store and distribute the captured energy.

6. The integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system according to claim 5 is characterized in that: The low-velocity ocean current energy power generation device is installed at the bottom of the lower part of the external annular working fluid pipe, and the low-velocity ocean current energy power generation device is connected to the second working fluid pump through a power transmission pipeline to supply power to the second working fluid pump.

7. The integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system according to claim 2 is characterized in that: The first working fluid pump is a gas-liquid mixing pump with a pressure higher than a set pressure, and the second working fluid pump is a submersible pump with a pressure higher than a set pressure.

8. The integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system according to claim 4 is characterized in that: The spiral form of the external spiral heat exchange tube includes any one of an equidistant spiral curve and an Archimedean spiral curve.

9. The integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system according to claim 4 is characterized in that: The tube body structure of the external spiral heat exchange tube includes any one of a cylindrical shape, a flat elliptical shape or a thin rectangular shape.

10. The integrated fully submersible annular heat exchange cycle ocean temperature difference energy power generation system according to claim 1, characterized in that: The range of the first temperature sea area includes the area from sea level to a depth of 100m below sea level; the range of the transition temperature sea area includes the area from a depth of 100m to a depth of 700m below sea level; the range of the second temperature sea area includes the area from a depth of 700m to a depth of 1000m below sea level.

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