A fixable implanted ocean thermal energy conversion power grid system

Abstract

The present invention discloses a fixable implanted ocean thermal energy conversion power grid system, which relates to the technical field of ocean thermal energy conversion power generation. It includes: a fixable frame and an implanted ocean thermal energy conversion power generation unit arranged on the fixable frame. The implanted ocean thermal energy conversion power generation unit includes: a turbine, a working fluid evaporator, and a working fluid condenser. The turbine is used to drive a generator to generate electricity; the working fluid evaporator is located in a first temperature sea area, and the working fluid evaporator has a heat exchange pipeline to use the seawater in the first temperature sea area to heat the liquid circulating working fluid flowing through itself to form a gaseous circulating working fluid, and then transport it to the turbine; the working fluid condenser is located in a second temperature sea area, and the working fluid condenser has a heat exchange pipeline to use the seawater in the second temperature sea area to absorb heat from the gaseous circulating working fluid flowing out after the turbine generates electricity and flowing through itself to form a liquid circulating working fluid, and the liquid circulating working fluid is re-transported back to the working fluid evaporator. The seawater temperature in the first temperature sea area is higher than the seawater temperature in the second temperature sea area.

Description

Technical Field

[0001] The present invention relates to the technical field of ocean thermal energy conversion power generation, and particularly relates to a fixable implanted ocean thermal energy conversion power generation network system. Background Art

[0002] Ocean renewable energy has always received extensive attention from the international community due to its huge reserves, cleanness, and renewability. Research scholars around the world have been committed to developing ocean renewable energy, solving important technical bottlenecks, and exploring the ways and methods of industrialization. From the current development and application status of ocean renewable energy technologies, it can be seen that ocean thermal energy conversion power generation systems of a certain scale have the most significant development benefits. Ocean thermal energy has the characteristics of being clean and renewable, stable energy supply, small power generation fluctuations, being able to generate electricity all day long, and being unaffected by time, season, and weather. The energy stability is comparable to that of fossil energy and no energy storage system is required, which can supply electricity for remote islands, ocean exploration, offshore oil and gas development, etc., and has the potential to replace traditional fossil energy. At present, the design of large-scale ocean thermal energy conversion power generation systems and the supporting offshore engineering construction technologies are not yet mature, and there has been no technical breakthrough in the power generation network of large-scale offshore systems.

[0003] Currently, the main ways of arranging ocean thermal energy conversion power generation system devices that are relatively mature are shore-based, semi-submersible, and ship-based. The principle of their power generation is to pump and absorb hot seawater and cold seawater respectively, transport them to the evaporator and condenser for heat exchange with the working medium, and generate electricity through the phase change of the working medium. This system design results in the need to lay long hot water pipes and cold water pipes for the pumping steps of hot and cold seawater, especially for shore-based ocean thermal energy conversion power generation systems. To reduce the head loss of seawater flowing in the pipeline, that is, the diameter of the pumping pipeline must be wide enough, which leads to huge energy consumption of the pump, and there are a large number of energy losses during the transportation of seawater, resulting in low thermal efficiency of the power generation system cycle. Establishing a large-scale ocean thermal energy conversion power generation network system requires solving problems such as the structural stability of the system, the laying and fixation of the power generation network, the reasonable distribution of supporting equipment of the system, and the cycle efficiency of the system. To solve the above technical problems and gradually realize the commercial application of ocean thermal energy conversion power generation systems, a large amount of technical research and system design innovation are still needed. Summary of the Invention

[0004] Aiming at the deficiencies in the prior art, the present invention provides a fixable implanted ocean thermal energy conversion power generation network system, which is based on the implanted ocean thermal energy conversion power generation unit, and fixes the system in the ocean area through a fixable frame to achieve the stability of the system under complex deep-sea conditions and the reasonable distribution of operating equipment.

[0005] To achieve the above object, the present invention can adopt the following technical solutions:

[0006] A fixed, embedded ocean temperature difference energy power generation grid system, comprising:

[0007] The frame can be fixed;

[0008] The embedded ocean temperature difference energy power generation unit provided on the fixable frame comprises:

[0009] - a turbine for driving a generator to generate electricity;

[0010] - a working medium evaporator, which is located in the first temperature sea area, and the working medium evaporator has a heat exchange pipe to use the seawater in the first temperature sea area to heat the liquid circulating working medium flowing through itself to form a gaseous circulating working medium, and transport it to the

[0011] turbine;

[0012] - a working fluid condenser, which is located in a second temperature sea zone and has a heat exchange pipe for utilizing the seawater in the second temperature sea zone to absorb heat from the gaseous circulating working fluid flowing out of the turbine after power generation and flowing through the working fluid condenser to form a liquid circulating working fluid, wherein the liquid circulating working fluid is re-transported back to the working fluid evaporator, and the seawater temperature in the first temperature sea zone is higher than the seawater temperature in the second temperature sea zone.

[0013] The above-mentioned fixed embedded ocean temperature difference energy power generation grid system further comprises:

[0014] The construction platform, the support frame and the fixed base cooperate to form a skeleton part, and an anchor base is further provided below the fixed base;

[0015] An adjusting tensioning device, an anchoring chain, and a chain base are used in conjunction with each other to fix the skeleton portion to the seabed, wherein the construction platform is arranged above sea level, the supporting frame is arranged in the ocean area, the fixing base is arranged on the seabed mud surface, and the anchoring base is arranged below the seabed mud surface;

[0016] The adjusting and tensioning device is arranged on the construction platform, the chain base is arranged below the seabed mud surface, and the two ends of the anchoring chain are respectively connected between the adjusting and tensioning device and the chain base.

[0017] The above-mentioned fixed embedded ocean temperature difference energy power generation grid system further comprises:

[0018] The working fluid evaporator comprises:

[0019] a first pipe running through the axis;

[0020] spiraling a second conduit around the first conduit, and,

[0021] A third pipe spirally surrounds the first pipe, and each spiral surface of the third pipe is in contact with the second pipe for heat exchange;

[0022] The working fluid condenser includes:

[0023] A fourth pipe passing through the axis;

[0024] A fifth pipe spirally surrounding the fourth pipe, and,

[0025] A sixth pipe spirally surrounding the fourth pipe, and each spiral surface of the sixth pipe is in contact with the fifth pipe for heat exchange;

[0026] The first pipe is communicated with the fourth pipe, the downstream end of the fourth pipe is communicated with the upstream end of the sixth pipe, the sixth pipe is communicated with the third pipe, the downstream end of the third pipe is communicated with the inlet end of the turbine, and the upstream end of the first pipe is communicated with the outlet end of the turbine; A combined pipe runs through the first pipe and the fourth pipe to form a working fluid circulation pipe.

[0027] In the fixed implantable ocean thermal energy conversion power grid system as described above, further, a gas-liquid separator is further provided on the pipe where the downstream end of the third pipe is communicated with the inlet end of the turbine, and the separated liquid circulating working fluid flows to the upstream end of the first pipe.

[0028] In the fixed implantable ocean thermal energy conversion power grid system as described above, further, a plurality of the implantable ocean thermal energy conversion power generation units are distributed at circumferential intervals along the fixed frame.

[0029] In the fixed implantable ocean thermal energy conversion power grid system as described above, further, a power storage device, a power transmission cable and a submarine cable pipeline are further included. The power storage device is installed on the construction platform, the power transmission cable is arranged on the support fixing frame, one end of the submarine cable pipeline is connected to the power storage device through the power transmission cable, and the other end of the submarine cable pipeline is connected to the onshore power grid.

[0030] In the fixed implantable ocean thermal energy conversion power grid system as described above, further, the outer layer of the power transmission cable is wrapped with a material having waterproof, anti-corrosion and pressure-resistant properties; the submarine cable pipeline is arranged under the seabed mud surface.

[0031] In the fixed implantable ocean thermal energy conversion power grid system as described above, further, a working fluid pump is further provided on the pipe where the upstream end of the first pipe is communicated with the outlet end of the turbine; a check valve is further provided on the pipe where the sixth pipe is communicated with the third pipe;

[0032] A sealing connection structure is provided outside the pipeline between the working fluid evaporator and the working fluid condenser. The sealing connection structure includes:

[0033] A heat insulation layer covering the pipeline; and,

[0034] An outer layer for enclosing the heat insulation layer.

[0035] In the fixed implantable ocean thermal energy conversion power grid system as described above, further, the implantable ocean thermal energy conversion power generation unit further includes a hot water pump and a cold water pump. The support fixing frame is provided with a plurality of fixing frames. The hot water pump and the cold water pump are installed on the fixing frames. The outlet of the hot water pump is connected to the inlet of the hot seawater pump of the working fluid evaporator, which is used to pump the seawater in the first temperature sea area into the working fluid evaporator; the outlet of the cold water pump is connected to the inlet of the cold seawater pump of the working fluid condenser, which is used to pump the seawater in the second temperature sea area into the working fluid condenser.

[0036] In the fixed implantable ocean thermal energy conversion power grid system as described above, further, the implantable ocean thermal energy conversion power generation unit further includes a plurality of fixing rings. The plurality of fixing rings are used to fix the working fluid circulation pipe on the axial through holes of the working fluid evaporator and the working fluid condenser; the shapes of the working fluid evaporator and the working fluid condenser both include any one of a cylindrical shape, a cubic shape, or a multi-layer spiral plate type.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0038] 1. On the basis of the integrated design of the overall structure of the implantable ocean thermal energy conversion power generation system, it improves the problems of long pipeline laying, long-distance heat exchange source transportation, large energy consumption, and complex structure design required by existing power generation demonstration stations, effectively improving the operation efficiency of the power generation system, the convenience of structure installation, and the application scope of the power generation system.

[0039] 2. This system considers the actual engineering applications of multiple implantable ocean thermal energy conversion power generation units, designs the layout plan of a large-scale power grid and the fixing plan of the overall system, and realizes the system stability under complex deep-sea working conditions and the reasonable distribution of operating equipment. It provides a design idea for the future establishment of a large-scale offshore system power grid and promotes the development process of large-scale industrial application of ocean thermal energy conversion power generation.

[0040] 3. The implantable ocean thermal energy conversion power generation unit of the present invention adopts the structures of a spiral working fluid evaporator and a working fluid condenser. Through special structure design, on the one hand, the system can realize the working fluid cycle power generation mode and the function of in-situ heat exchange between heat and cold sources, greatly reducing the work consumption required for pumping seawater and the energy loss during the transmission process; on the other hand, the heat exchange area is greatly increased, which can effectively improve the heat exchange efficiency between hot and cold seawater and the working fluid. Brief Description of the Drawings

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0042] Figure 1 It is the first structural schematic diagram of the fixed implantable ocean thermal energy conversion power grid system according to the embodiment of the present invention;

[0043] Figure 2 It is the second structural schematic diagram of the fixed implantable ocean thermal energy conversion power grid system according to the embodiment of the present invention;

[0044] Figure 3 It is a partial schematic diagram of the fixed implantable ocean thermal energy conversion power grid system according to the embodiment of the present invention;

[0045] Figure 4 It is a schematic diagram of the arrangement of the implantable ocean thermal energy conversion power generation units according to the embodiment of the present invention;

[0046] Figure 5 It is a structural schematic diagram of the implantable ocean thermal energy conversion power generation unit according to the embodiment of the present invention;

[0047] Figure 6 It is a structural schematic diagram of the sealed connection structure of the implantable ocean thermal energy conversion power generation unit according to the embodiment of the present invention;

[0048] Figure 7 It is an internal structural schematic diagram of the working fluid evaporator of the implantable ocean thermal energy conversion power generation unit according to the embodiment of the present invention.

[0049] Wherein: 1. Tension adjusting device; 2. Construction platform; 3. Fixed frame; 4. Support fixed frame; 5. Anchoring chain; 6. Fixed base; 7. Anchoring base; 8. Chain base; 9. Working medium evaporator; 10. Working medium circulation pipe; 11. Working medium condenser; 12. Working medium pump; 13. Turbine; 14. Gas-liquid separator; 15. Hot water pump; 16. Cold water pump; 17. Electric energy storage device; 18. Transmission cable; 19. Submarine cable pipeline; 20. First embedded ocean thermal energy conversion power generation unit; 21. Second embedded ocean thermal energy conversion power generation unit; 22. Third embedded ocean thermal energy conversion power generation unit; 23. Fourth embedded ocean thermal energy conversion power generation unit; 24. Fifth embedded ocean thermal energy conversion power generation unit; 25. Sixth embedded ocean thermal energy conversion power generation unit; 26. Fixed ring; 27. Check valve; 28. Sealing connection structure; 28-1. Outer layer of the sealing connection structure; 28-2. Heat insulation layer of the sealing connection structure; A-1. Inlet of the hot seawater pump; A-2. Outlet of the hot seawater pump; A-3. Inlet of the liquid working medium; A-4. Outlet of the gaseous working medium; B-1. Inlet of the cold seawater pump; B-2. Outlet of the cold seawater pump; B-3. Inlet of the exhausted working medium; B-4. Outlet of the liquid working medium; C-1. Inlet of the working medium circulation pipe; C-2. Outlet of the working medium circulation pipe. Detailed implementation mode

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0051] Embodiment:

[0052] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned accompanying drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" in the embodiments of the present invention and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0053] It should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0054] In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined. In addition, unless otherwise clearly specified and defined, the terms "mounted", "connected", and "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside 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.

[0055] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0056] See Figures 1 to 7 As shown, the present invention provides a fixable implanted ocean thermal energy conversion power grid system. The system adopts an integrated power generation cycle structure design. The hot water pump 15 and the cold water pump 16 are respectively arranged in the hot seawater area and the cold seawater area for in-situ seawater extraction, reducing the ineffective loss of energy and improving the cycle thermal efficiency of the power generation system. Based on the integrated structure of the implanted ocean thermal energy conversion power generation unit, it provides the design content of the power grid layout and fixation method for establishing a large-scale offshore system power grid in the future, ensuring that the implanted ocean thermal energy conversion power generation system can be firmly established in the ocean area, reducing the influence of working environments such as sea waves and internal waves, and ensuring that the overall power grid will not swing significantly, thus causing problems such as structural loss and shortened lifespan of the power generation system, and promoting the large-scale industrial application of future ocean thermal energy conversion power generation.

[0057] SeeFigure 1 , Figure 1 discloses a fixable implanted ocean thermal energy conversion power grid system, which includes: a fixable frame and an implanted ocean thermal energy conversion power generation unit arranged on the fixable frame. Among them, the implanted ocean thermal energy conversion power generation unit includes: a turbine 13, a working fluid evaporator 9 and a working fluid condenser 11. The turbine 13 is used to drive a generator to generate electricity; the working fluid evaporator 9 is located in a first temperature sea area, and the working fluid evaporator 9 has a heat exchange pipeline to use the seawater in the first temperature sea area to heat the liquid circulating working fluid flowing through itself to form a gaseous circulating working fluid, and then transport it to the turbine 13; the working fluid condenser 11 is located in a second temperature sea area, and the working fluid condenser 11 has a heat exchange pipeline to use the seawater in the second temperature sea area to absorb heat from the gaseous circulating working fluid flowing out after the turbine 13 generates electricity and flowing through itself to form a liquid circulating working fluid, and then the liquid circulating working fluid is transported back to the working fluid evaporator 9 again, and the seawater temperature in the first temperature sea area is higher than the seawater temperature in the second temperature sea area.

[0058] In this embodiment, the fixable frame is used to firmly establish the implanted ocean thermal energy conversion power generation unit in the ocean area, and several implanted ocean thermal energy conversion power generation units are arranged on the fixable frame according to the actual working conditions. The first temperature sea area is a hot seawater area, and the second temperature sea area is a cold seawater area. The working fluid evaporator 9 is connected with a hot water pump 15 for pumping hot seawater into the working fluid evaporator 9, and the working fluid condenser 11 is connected with a cold water pump 16 for pumping cold seawater into the working fluid condenser 11. At the same time, the working fluid evaporator 9 and the working fluid condenser 11 are connected through a working fluid circulation pipe 10. When the system is in use, the liquid working fluid enters the working fluid evaporator 9 through the hot water pump 15 and exchanges heat with the working fluid circulating inside the working fluid evaporator 9, so that the working fluid is vaporized after being heated. The vaporized working fluid is transported to the turbine 13 through a pipeline for power generation. The exhausted working fluid after power generation is transported to the working fluid condenser 11 through the working fluid circulation pipe 10, and the exhausted working fluid exchanges heat with the working fluid circulating inside the working fluid condenser 11, so that the exhausted working fluid is liquefied and output after being cooled. It can be understood that this system adopts an integrated power generation cycle structure design. The hot water pump 15 and the cold water pump 16 are respectively arranged in the hot seawater area and the cold seawater area to extract seawater in situ, reduce the ineffective loss of energy, and improve the cycle thermal efficiency of the power generation system. Based on the integrated structure of the implanted ocean thermal energy conversion power generation unit, it provides the design content of the power grid layout and fixation method for the future construction of a large-scale offshore system power grid, ensuring that the implanted ocean thermal energy conversion power generation system can be firmly established in the ocean area, reducing the influence of working environments such as sea waves and internal waves, and ensuring that the overall power grid will not swing significantly, thus causing problems such as structural loss and shortened service life of the power generation system.

[0059] See again Figure 1, As an alternative embodiment, in some embodiments, the support frame may include: a construction platform 2, a support and fixing frame 4, a fixed base 6, an adjustment and tensioning device 1, an anchor chain 5, and a chain base 8. Among them, the construction platform 2, the support and fixing frame 4, and the fixed base 6 cooperate to form a skeleton part, and an anchor base 7 is further provided below the fixed base 6; the adjustment and tensioning device 1, the anchor chain 5, and the chain base 8 are used in cooperation to fix the skeleton part to the seabed. The construction platform 2 is arranged on the sea level, the support and fixing frame 4 is arranged in the ocean area, the fixed base 6 is arranged on the seabed mud surface, and the anchor base 7 is arranged under the seabed mud surface; the adjustment and tensioning device 1 is arranged on the construction platform 2, the chain base 8 is arranged under the seabed mud surface, and both ends of the anchor chain 5 are respectively connected between the adjustment and tensioning device 1 and the chain base 8.

[0060] In this embodiment, the construction platform 2 is located at a safe position on the sea level, and the center position thereof is the connection position at the top end of the support and fixing frame 4. The construction platform 2 may be provided with several power generation modules for implantable ocean thermal energy conversion power generation units and a working area for technicians according to the design. The power generation module mainly includes the construction platform 2, a turbine 13, a gas-liquid separator 14, and a working fluid pump 12. Its function is to establish the construction platform 2 of the sea surface system, arrange the power generation equipment required for the overall structure of the implantable system, output the gaseous working fluid into the turbine 13 for power generation, and design several sets of gas-liquid separators 14, turbines 13, and working fluid pumps 12 required for power generation according to parameters such as the power generation power of the turbine 13, the expansion efficiency of the gaseous working fluid, the separation efficiency of the gas-liquid separator 14, and the pumping capacity of the working fluid pump 12. The support and fixing frame 4 is arranged in the ocean area, which is used to connect the construction platform 2 and the fixed base 6 and is provided with a circulation module of the implantable ocean thermal energy conversion power generation unit. The fixed anchor chain structure includes an adjustment and tensioning device 1, an anchor chain 5, and a chain base 8. The fixed base 6 and the fixed anchor chain structure are used to support the overall structure of the power generation network of the implantable ocean thermal energy conversion power generation system. The adjustment and tensioning device 1 is arranged on the construction platform 2 for easy operation. The tension degree of the fixed anchor chain structure at different angles can be adjusted by controlling the length of the anchor chain to maintain the balance and stability of the overall structure of the power generation network and reduce the impact of sea conditions on the system structure. The anchor base 7 can be designed to be distributed at multiple points below the fixed base 6 according to requirements. It has a relatively heavy mass and is pressed into the seabed under the action of its own weight and the weight of the upper structure during the process of lowering the overall structure, playing a fixing role.

[0061] See Figure 5 , Figure 7, as an alternative embodiment, in some embodiments, the working fluid evaporator 9 includes: a first pipe passing through the axis, a second pipe spirally wound around the first pipe, and a third pipe spirally wound around the first pipe, and each turn of the spiral surface of the third pipe is in contact with the second pipe for heat exchange. The working fluid condenser 11 includes: a fourth pipe passing through the axis, a fifth pipe spirally wound around the fourth pipe, and a sixth pipe spirally wound around the fourth pipe, and each turn of the spiral surface of the sixth pipe is in contact with the fifth pipe for heat exchange.

[0062] Specifically, the internal hot seawater circulation channel of the working fluid evaporator 9 is spirally distributed around the first pipe. The third pipe and the second pipe are both spirally wound pipes stacked layer by layer. Among them, the two spirally wound pipes are not connected and have a certain thickness interval, that is, the working fluid circulation pipe and the hot seawater circulation pipe are overlapping spiral distributions, that is, one layer of hot seawater and one layer of working fluid circulation. Thus, as Figure 7 shown, this structure has four inlets and outlets, namely the hot seawater pump inlet A-1, the hot seawater pump outlet A-2, the liquid working fluid inlet A-3, and the gaseous working fluid outlet A-4. Among them, A-1 and A-2 are the hot seawater circulation spirals, and A-3 and A-4 are the working fluid circulation spirals. The outlet of the hot water pump 15 is connected to the hot seawater pump inlet A-1. After the hot seawater entering the working fluid evaporator 9 undergoes heat exchange, it flows out from the hot seawater pump outlet A-2 to the ocean. The working fluid evaporator 9 adopts a vertical cylindrical structure. The liquid working fluid enters the working fluid circulation pipe in the working fluid evaporator 9 and moves upward along the spiral pipe of the working fluid circulation pipe, and exchanges heat with the hot seawater circulation pipe. The liquid working fluid after heat exchange is vaporized by heat and enters the turbine 13 for power generation. The working fluid evaporator 9 adopts a vertical cylindrical structure, which can make the vaporized working fluid move upward without being affected by gravity. In addition, the inside of the working fluid evaporator 9 adopts a layered overlapping manner of a double spiral structure, which can increase the heat exchange area between the hot seawater and the liquid working fluid and maximize the heat exchange efficiency.

[0063] In addition, the structures of the working fluid evaporator 9 and the working fluid condenser 11 are the same. The internal cold seawater circulation channel of the working fluid condenser 11 is spirally distributed around the fourth pipe. The fifth pipe and the sixth pipe are both spirally wound pipes stacked layer by layer. Among them, the two spirally wound pipes are not connected and have a certain thickness interval, that is, the working fluid circulation pipe and the cold seawater circulation pipe are overlapping spiral distributions, that is, one layer of cold seawater and one layer of working fluid circulation. As Figure 5As shown, there are four inlets and outlets in this structure, namely the inlet B-1 of the cold seawater pump, the outlet B-2 of the cold seawater pump, the inlet B-3 of the exhausted working medium, and the outlet B-4 of the liquid working medium; the outlet of the cold water pump 16 is connected to the inlet B-1 of the cold seawater pump of the working medium condenser 11. After the cold seawater entering the working medium condenser 11 undergoes heat exchange, it flows out from the outlet B-2 of the cold seawater pump to the ocean. The inside of the working medium condenser 11 adopts a double-helix structure with layers overlapping each other, which can increase the heat exchange area between the cold seawater and the exhausted working medium and maximize the condensation efficiency. It can be understood that both the working medium evaporator 9 and the working medium condenser 11 adopt the double-helix structure with layers overlapping each other. On the one hand, this structure enables the system to achieve the working medium cycle power generation mode and the function of in-situ heat exchange between the heat and cold sources, greatly reducing the work consumption required for pumping seawater and the energy loss during the transmission process; on the other hand, the significantly increased heat exchange area can effectively improve the heat exchange efficiency between the hot and cold seawater and the working medium.

[0064] Further, the first pipeline is connected to the fourth pipeline, the downstream end of the fourth pipeline is connected to the upstream end of the sixth pipeline, the sixth pipeline is connected to the third pipeline, the downstream end of the third pipeline is connected to the inlet end of the turbine 13, and the upstream end of the first pipeline is connected to the outlet end of the turbine 13; a combined pipeline runs through the first pipeline and the fourth pipeline to form a working medium circulation pipe 10. Even further, a gas-liquid separator 14 is also provided on the pipeline where the downstream end of the third pipeline is connected to the inlet end of the turbine 13, and the liquid circulating working medium separated by the gas-liquid separator 14 flows towards the upstream end of the first pipeline.

[0065] Specifically, the implanted ocean thermal energy conversion unit is connected to the working fluid evaporator 9, the working fluid condenser 11, and the turbine 13 through the first pipeline, the third pipeline, the fourth pipeline, and the sixth pipeline, enabling the gasified working fluid in the working fluid evaporator 9 to be transported to the turbine 13 for power generation. The exhausted working fluid after power generation is transported into the working fluid condenser 11 through the working fluid circulation pipe 10 for condensation and liquefaction, and then transported to the working fluid evaporator 9 for heating and gasification, thereby realizing the function of cyclic power generation. A combined pipeline runs through the first pipeline and the fourth pipeline to form a working fluid circulation pipe 10. The working fluid circulation pipe 10 passes through the axial through holes of the working fluid evaporator 9 and the working fluid condenser 11. The working fluid circulation pipe 10 can be an integral high-pressure-resistant pipe. When considering a very long actual application length, it can also be a pipe group formed by connecting a series of pipes into the required length. Exemplarily, the power generation process of the implanted ocean thermal energy conversion unit is as follows: The exhausted working fluid after the turbine 13 performs power generation work is transported to the exhausted working fluid inlet B-3 of the working fluid condenser 11 through the working fluid circulation pipe 10, and condenses into a liquid working fluid under the action of cold seawater, and is transported from the liquid working fluid outlet B-4 of the working fluid condenser 11 to the liquid working fluid inlet A-3 of the working fluid evaporator 9. The liquid working fluid is heated and gasified into a gaseous working fluid in the working fluid evaporator 9 under the action of hot seawater, and is transported from the gaseous working fluid outlet A-4 of the working fluid evaporator 9 to the turbine 13 for a new round of cyclic power generation. At the same time, by setting the gas-liquid separator 14, it can be ensured that only gaseous working fluid is input into the turbine 13, guaranteeing the power generation efficiency of the turbine 13 and extending its service life. If there is liquid working fluid separated by the gas-liquid separator 14, it is transported through the pipeline into the working fluid circulation pipe 10 for condensation circulation. In addition, the working fluid circulation pipe 10 of the implanted ocean thermal energy conversion unit adopts an existing pipeline with high-pressure resistance performance. Since the exhausted working fluid output after the turbine 13 generates power needs to be transported to the working fluid condenser 11 through the working fluid circulation pipe 10 for liquefaction, a certain pressure needs to be applied to transport the exhausted working fluid to the exhausted working fluid inlet B-3 of the working fluid condenser 11.

[0066] See Figure 4 , as an alternative embodiment, in some embodiments, a plurality of implanted ocean thermal energy conversion units are circumferentially spaced along the fixed frame. Specifically, the distribution positions of the implanted ocean thermal energy conversion units on the construction platform 2 can be arranged according to the actual engineering construction, and can be in forms such as annular distribution, array distribution, or multi-block distribution. The number of implanted ocean thermal energy conversion units can also be designed according to the scale of the system. Exemplarily, as Figure 4As described above, six implanted ocean thermal energy conversion units are evenly distributed in a ring on the construction platform 2, namely the first implanted ocean thermal energy conversion unit 20, the second implanted ocean thermal energy conversion unit 21, the third implanted ocean thermal energy conversion unit 22, the fourth implanted ocean thermal energy conversion unit 23, the fifth implanted ocean thermal energy conversion unit 24, and the sixth implanted ocean thermal energy conversion unit 25.

[0067] As an alternative implementation, in some embodiments, it further includes a power storage device 17, a power transmission cable 18, and a submarine cable pipeline 19. The power storage device 17 is installed on the construction platform 2. The power transmission cable 18 is arranged on the support fixing frame 4. One end of the submarine cable pipeline 19 is connected to the power storage device 17 through the power transmission cable 18, and the other end of the submarine cable pipeline 19 is connected to the onshore power grid.

[0068] In this embodiment, by setting the power storage device 17, the power transmission cable 18, and the submarine cable pipeline 19, the electricity obtained from the operation of the implanted ocean thermal energy conversion power generation system transmitted offshore can be transmitted to the onshore power grid through the power transmission structure. The power storage device 17 is located at the center of the construction platform 2, which is used to collect the power generation of several implanted ocean thermal energy conversion units, and then transmit it through the power transmission cable 18 installed on the support fixing frame 4, and extend to the onshore power grid through the submarine cable pipeline 19, realizing the power transmission of the offshore power generation network. The power transmission cable 18 is connected to the power storage device 17 on the construction platform 2, installed along the support fixing frame 4 and extends to the fixed base 6, then is fixed parallel to the fixed base 6 to the seabed, and finally is fixed at the seabed position through the submarine cable pipeline 19 extending to the shore.

[0069] In the above embodiment, further, the outer layer of the power transmission cable 18 is wrapped with a material having waterproof, anti-corrosion, and pressure-resistant properties; the submarine cable pipeline 19 is arranged under the seabed mud surface.

[0070] Specifically, the outer layer of the power transmission cable 18 is wrapped with an existing material having waterproof, anti-corrosion, and pressure-resistant properties, which can ensure the safety of power transmission. The submarine cable pipeline 19 is laid towards the onshore direction and fixed at the seabed position to ensure that the long-distance power transmission cable can be fixed at the seabed and will not affect the normal operation of other ocean equipment and organisms.

[0071] See Figure 6 , as an alternative implementation, in some embodiments, a working fluid pump 12 is further provided on the pipeline where the upstream end of the first pipeline is connected to the outlet end of the turbine 13; a check valve 27 is further provided on the pipeline where the sixth pipeline is connected to the third pipeline; a sealing connection structure 28 is provided outside the pipeline between the working fluid evaporator 9 and the working fluid condenser 11, and the sealing connection structure 28 includes: a heat insulation layer covering the pipeline and an outer layer for enclosing the heat insulation layer.

[0072] In this embodiment, the working fluid pump 12 is used to pump the exhausted working fluid into the working fluid condenser 11 for rapid liquefaction. By setting the one-way valve 27, it can ensure that the circulating working fluid migrates along the circulating path of the system and prevent the phenomenon of working fluid backflow. In addition, a sealed connection structure 28 is also provided, whose function is to achieve the consistency of the structural form and weight of the entire implanted ocean thermal energy conversion unit, ensure the sealing and heat insulation of the connection position, and guarantee the safety of the working fluid circulation. The sealed connection structure 28 is generally divided into two layers, including an outer layer and a heat insulation layer. Among them, the material of the outer layer 28-1 of the sealed connection structure has the properties of corrosion resistance and heavy mass, and the material of the heat insulation layer 28-2 of the sealed connection structure has the properties of high sealing and heat insulation. Further, the implanted ocean thermal energy conversion unit further includes a plurality of fixing rings 26, and the plurality of fixing rings 26 are used to fix the working fluid circulation pipe 10 on the axial through holes of the working fluid evaporator 9 and the working fluid condenser 11. Specifically, the through holes at the axes of the working fluid evaporator 9 and the working fluid condenser 11 are assembled through the working fluid circulation pipe 10, which is used to pressurize and transport the exhausted working fluid from the turbine 13 after power generation to the through hole outlet of the working fluid condenser 11, and then enter the working fluid spiral channel inside the working fluid condenser 11 from port B-3, and overlap and spiral with the spiral channel of the cold seawater, so that the heat exchange area between the exhausted working fluid and the cold seawater is increased, thereby rapidly cooling and liquefying the working fluid. Preferably, there are four fixing rings 26, which are respectively installed at the inlet and outlet where the working fluid circulation pipe 10 passes through the inside of the working fluid evaporator 9, and the inlet and outlet where the working fluid circulation pipe 10 passes through the inside of the working fluid condenser 11.

[0073] As an alternative embodiment, in some embodiments, the implanted ocean thermal energy conversion unit further includes a hot water pump 15 and a cold water pump 16. The support fixing frame 4 is provided with a plurality of fixing frames 3, and the hot water pump 15 and the cold water pump 16 are installed on the fixing frames 3. The outlet of the hot water pump 15 is connected to the hot seawater pump inlet A-1 of the working fluid evaporator 9, which is used to pump the seawater in the first temperature sea area into the working fluid evaporator 9; the outlet of the cold water pump 16 is connected to the cold seawater pump inlet B-1 of the working fluid condenser 11, which is used to pump the seawater in the second temperature sea area into the working fluid condenser 11.

[0074] Specifically, at the parallel position of the hot water inlet of the working fluid evaporator 9 on the support fixing frame 4, a plurality of fixing frames 3 for supporting the hot water pump 15 are provided, and the hot water pump 15 is connected to the working fluid evaporator 9 by a hot water pipe; at the parallel position of the cold water inlet of the working fluid condenser 11 on the support fixing frame 4, a plurality of fixing frames 3 for supporting the cold water pump 16 are provided, and the cold water pump 16 is connected to the working fluid condenser 11 by a cold water pipe. In addition, the number of the fixing frames 3 on the support fixing frame 4 can be reasonably designed according to the load-bearing capacity.

[0075] As an alternative implementation, in some embodiments, the forms of the working fluid evaporator 9 and the working fluid condenser 11 both include any one of a cylindrical shape, a cubic shape, or a multi-layer spiral plate type. Further, the working fluid type of this system can be a single pure working fluid or a multi-component non-azeotropic working fluid, and the specific application scenario depends on the actual working conditions requirements.

[0076] For a better understanding of the present invention, the implementation steps of this power generation system will be described below by taking Figure 4 the distribution form as an example.

[0077] First, assume that according to the parameters such as the power generation power of the turbine 13, the expansion efficiency of the gaseous working fluid, the separation efficiency of the gas-liquid separator 14, the pumping capacity of the working fluid pump 12, the pumping powers of the hot water pump 15 and the cold water pump 16, and the ratio between the gasification and liquefaction rates of the submerged ocean thermal energy conversion unit, and the heat exchange efficiency, it is calculated that two submerged ocean thermal energy conversion units can share a set of power generation equipment and the hot water pump 15 and the cold water pump 16. Then, for the overall structure of the power grid of the six submerged systems in this example, three sets of power generation equipment and the hot water pump 15 and the cold water pump 16 need to be arranged.

[0078] System construction of the submerged ocean thermal energy conversion power generation system: Lower the overall structure of the construction platform 2, the support fixing frame 4, the fixed base 6, and the anchoring base 7 into a suitable sea area. Lower the fixed base 6 into the seabed mud surface by its own weight, and then lower the chain base 8 into the seabed mud surface to achieve the stable layout of the system framework; Lower the six submerged ocean thermal energy conversion units into their designed positions respectively, and clamp and fix the structures through the support fixing frame 4; Lower three sets of hot water pumps 15 and cold water pumps 16 to connect the hot seawater pump inlet A-1 and the cold seawater pump inlet B-1. One set of hot water pump 15 and cold water pump 16 is respectively connected to the hot seawater pump inlet A-1 and the cold seawater pump inlet B-1 of two submerged ocean thermal energy conversion units; Arrange three sets of power generation equipment on the construction platform 2, including the gas-liquid separator 14, the turbine 13, and the working fluid pump 12. One set of power generation equipment is connected to the gaseous working fluid outlet A-4 and the exhausted working fluid inlet B-3 of two submerged ocean thermal energy conversion units respectively to perform power generation and circulation processes; Finally, lay the submarine cable pipeline 19 to the shore on the seabed, and configure and arrange the electricity storage device 17 and the transmission cable 18.

[0079] Operation process of the implanted ocean thermal energy conversion power generation unit: A certain amount of circulating working fluid is injected into the implanted ocean thermal energy conversion power generation unit through the working fluid pump 12. The hot water pump 15 pumps in hot seawater according to the design requirements, enters the double - helix structure from the A - 1 port of the working fluid evaporator 9 to heat the liquid working fluid, and flows out to the ocean from the A - 2 port of the working fluid evaporator 9 after the heat exchange operation. After the liquid working fluid is heated and vaporized, the gaseous working fluid is output from the A - 4 port of the working fluid evaporator 9 to the gas - liquid separator 14. The separated gaseous working fluid is input into the turbine 13 for power generation, and the generated electricity is transmitted to the on - shore power grid through the transmission cable. The separated liquid working fluid and the exhausted working fluid after power generation by the turbine 13 are transported to the inlet C - 1 of the working fluid circulation pipe through the working fluid pump 12. The exhausted working fluid is pumped out from the outlet C - 2 of the working fluid circulation pipe to the inlet B - 3 of the working fluid condenser 11. The cold water pump 16 pumps in cold seawater according to the design requirements, enters the double - helix structure from the B - 1 port of the working fluid condenser 11 to condense the exhausted working fluid, and flows out to the ocean from the B - 2 port of the working fluid condenser 11 after the heat exchange operation. After the exhausted working fluid is condensed and liquefied, it is output from the B - 4 port of the working fluid condenser 11 to the A - 3 port of the working fluid evaporator 9 for the next round of cyclic process. By repeating the above steps cyclically, the operation of the ocean thermal energy conversion power generation system is realized, and the system's cyclic power generation function is achieved.

[0080] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection 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 - mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0081] The above - mentioned embodiments are only for illustrating the technical concept and features of the present invention. The purpose is to enable ordinary technicians in the art to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the essence of the content of the present invention should be covered within the protection scope of the present invention.

Claims

1. A fixed, embedded ocean temperature difference energy power generation grid system, characterized in that: Comprising: A fixable frame; An implanted ocean thermal energy conversion unit disposed on the fixable frame, comprising: - A turbine for driving a generator to generate electricity; - A working fluid evaporator which is in a first temperature sea area, and the working fluid evaporator has a heat exchange pipeline to heat the liquid cycle working fluid flowing through itself with the seawater in the first temperature sea area to form a gaseous cycle working fluid and transport it to the turbine; the working fluid evaporator comprises: a first pipeline penetrating through the axis; a second pipeline spirally wound around the first pipeline, and a third pipeline spirally wound around the first pipeline, and each spiral surface of the third pipeline is in contact heat exchange with the second pipeline; - A working fluid condenser which is in a second temperature sea area, and the working fluid condenser has a heat exchange pipeline to absorb heat from the gaseous cycle working fluid flowing out after the turbine generates electricity and flowing through itself with the seawater in the second temperature sea area to form a liquid cycle working fluid, wherein the liquid cycle working fluid is re-transported back to the working fluid evaporator, and the seawater temperature in the first temperature sea area is higher than the seawater temperature in the second temperature sea area; the working fluid condenser comprises: a fourth pipeline penetrating through the axis; a fifth pipeline spirally wound around the fourth pipeline, and a sixth pipeline spirally wound around the fourth pipeline, and each spiral surface of the sixth pipeline is in contact heat exchange with the fifth pipeline; The first pipeline is communicated with the fourth pipeline, the downstream end of the fourth pipeline is communicated with the upstream end of the sixth pipeline, the sixth pipeline is communicated with the third pipeline, the downstream end of the third pipeline is communicated with the inlet end of the turbine, and the upstream end of the first pipeline is communicated with the outlet end of the turbine; a combined pipeline penetrates through the first pipeline and the fourth pipeline to form a working fluid circulation pipeline.

2. The fixed embedded ocean temperature difference energy power generation grid system according to claim 1, characterized in that: The fixable frame comprises: A construction platform, a support fixing frame and a fixing base which cooperate to form a skeleton part, and an anchoring base is further arranged below the fixing base; An adjusting tensioning device, an anchoring chain and a chain base which are used in cooperation to fix the skeleton part on the seabed, wherein the construction platform is arranged on the sea level, the support fixing frame is arranged in the ocean area, the fixing base is arranged on the seabed mud surface, and the anchoring base is arranged under the seabed mud surface; The adjusting tensioning device is arranged on the construction platform, the chain base is arranged under the seabed mud surface, and two ends of the anchoring chain are respectively connected between the adjusting tensioning device and the chain base.

3. The fixable implantable ocean thermal energy conversion power grid system according to claim 1, wherein A gas-liquid separator is further arranged on the pipeline where the downstream end of the third pipeline is communicated with the inlet end of the turbine, and the separated liquid cycle working fluid of the gas-liquid separator flows towards the upstream end of the first pipeline.

4. The fixable implantable ocean thermal energy conversion power grid system according to any one of claims 1-3, characterized in that, A plurality of the implanted ocean thermal energy conversion units are distributed at circumferential intervals along the fixable frame.

5. The fixable implanted ocean thermal energy conversion power grid system according to claim 2, wherein, Also comprising a power storage device, a power transmission cable and a submarine cable pipeline, the power storage device is installed on the construction platform, the power transmission cable is arranged on the support fixing frame, one end of the submarine cable pipeline is connected with the power storage device through the power transmission cable, and the other end of the submarine cable pipeline is connected to the onshore power grid.

6. The fixable implanted ocean thermal energy conversion power grid system according to claim 5, characterized in that, The outer layer of the transmission cable is wrapped with a material having waterproof, anti-corrosion and pressure-resistant properties; the submarine cable pipeline is arranged under the seabed mud surface.

7. The fixed implantable ocean thermal energy conversion power grid system according to claim 1, characterized in that, A working fluid pump is further provided on the pipeline where the upstream end of the first pipeline is communicated with the outlet end of the turbine; a check valve is further provided on the pipeline where the sixth pipeline is communicated with the third pipeline; A sealing connection structure is provided outside the pipeline between the working fluid evaporator and the working fluid condenser, and the sealing connection structure includes: A heat insulation layer covering the pipeline; and, An outer layer for enclosing the heat insulation layer.

8. The fixable implanted ocean thermal energy conversion power grid system according to claim 2, characterized in that, The implanted ocean thermal energy conversion unit further includes a hot water pump and a cold water pump. The support fixing frame is provided with a plurality of fixing frames, and the hot water pump and the cold water pump are installed on the fixing frames. The outlet of the hot water pump is connected to the inlet of the hot seawater pump of the working fluid evaporator, and it is used to pump the seawater in the first temperature sea area into the working fluid evaporator; the outlet of the cold water pump is connected to the inlet of the cold seawater pump of the working fluid condenser, and it is used to pump the seawater in the second temperature sea area into the working fluid condenser.

9. The fixed embedded ocean temperature difference energy power generation grid system according to claim 1, characterized in that: The implanted ocean thermal energy conversion unit further includes a plurality of fixing rings, and the plurality of fixing rings are used to fix the working fluid circulation pipe on the axial through holes of the working fluid evaporator and the working fluid condenser; the shapes of the working fluid evaporator and the working fluid condenser both include any one of a cylindrical shape, a cube shape or a multi-layer spiral plate shape.

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