Ocean thermal energy conversion system for recovering and utilizing pressure energy

Abstract

The application discloses a marine temperature difference energy power generation system for realizing pressure energy recycling, which comprises a temperature difference energy power generation assembly for generating power by marine temperature difference energy and connected with a hydraulic energy recycling assembly, and the pressure energy is converted by a hydraulic cylinder and a liquid level transmitter to fully recycle the pressure energy in the temperature difference energy power generation system; the hydraulic energy recycling assembly is arranged in an ammonia-lean solution branch and an ammonia extraction and reheating branch respectively and connected with the temperature difference energy power generation assembly to recycle the pressure energy in the ammonia-lean solution and ammonia gas and the pressure energy in the exhaust gas from a high-pressure turbine outlet; the ammonia-lean solution branch is connected with an outlet of a gas-liquid separator to recycle the pressure energy in the ammonia-lean solution when the high-pressure liquid working medium works; and the ammonia extraction and reheating branch is connected with high-pressure and low-pressure turbine inlets to recycle the pressure energy in the ammonia gas and the exhaust gas from the high-pressure turbine outlet when the high-pressure gaseous working medium works.

Description

Technical fields:

[0001] This invention relates to an ocean thermal energy conversion system that recovers and utilizes pressure energy. Background technology:

[0002] Ocean thermal energy conversion (OTEC) refers to the thermal energy contained in the temperature difference between the warm surface water and the cold deep water. OTEC can generate electricity while also providing comprehensive benefits in freshwater production, cooling, and mariculture. Furthermore, OTEC can power both large deep-sea equipment and small underwater mobile equipment. Because OTEC is a low-grade heat source, its utilization is relatively difficult; therefore, fully utilizing the energy contained in ocean thermal energy conversion is particularly important.

[0003] However, for general circulation mechanisms, such as the organic Rankine cycle, only the heat from the ocean thermal energy difference and a portion of the pressure of the gaseous working fluid are utilized. Due to the seasonal variability of ocean thermal energy difference, the Rankine cycle can only utilize the heat and a small portion of the pressure, and cannot fully utilize it. When the working fluid passes through the warm seawater heat exchanger, in addition to the heat from the ocean, it also receives some high-pressure steam. If ammonia is used as the working fluid, a high-pressure solution will also be obtained. Some of the gaseous working fluid is consumed by the turbine, but not completely, while the pressure energy of the high-pressure liquid working fluid cannot be utilized at all.

[0004] Existing power generation methods are often simple pneumatic drive power generation, which results in a large overall weight and volume of the device, leading to a large inertia and slow response speed. At the same time, the connection and coordination of the various components in existing pneumatic drive power generation devices are too simple and fixed, which cannot generate electricity accurately and automatically. The power generation efficiency and overall power output of the device cannot meet the needs of practical applications. Summary of the Invention:

[0005] This invention provides an ocean thermal energy conversion system for pressure energy recovery and utilization. The system features a rational structural design, utilizing multiple functional modules working together. A hydraulic system is employed for energy conversion. A hydraulic turbine is connected to the ammonia-lean solution branch in the circulation system where a pressure difference exists. This pressure difference drives the hydraulic turbine to perform work. The pumping and regenerating branch in the circulation system uses a pneumatic three-way electric ball valve to adjust the pumping ratio. Hydraulic cylinders and level transmitters are used to convert and utilize pressure energy, achieving full recovery and utilization of pressure energy in the ocean thermal energy conversion system. This improves the overall circulation power generation efficiency and enables more efficient utilization of ocean thermal energy. Compared to purely pneumatically driven power generation devices, this system is smaller and has a faster response time. The various functional components in the hydraulic system can be conveniently and flexibly arranged according to actual needs, allowing for higher levels of automatic control and remote control, resulting in higher power generation and efficiency. This effectively utilizes ocean thermal energy, achieving stable, continuous, and efficient power generation, thus solving the problems existing in the prior art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] An ocean thermal energy conversion system for pressure energy recovery and utilization, the system comprising:

[0008] Thermoelectric power generation component, which is used to generate electricity by utilizing ocean thermal energy difference, and is connected to hydraulic energy recovery component, which converts pressure energy through hydraulic cylinder and level transmitter, so as to fully recover and utilize pressure energy in thermoelectric power generation system.

[0009] A hydraulic energy recovery component is provided, which is installed in the lean ammonia solution branch and the gas extraction and regeneration branch, and connected to the thermoelectric power generation component. This component recovers and utilizes the pressure energy in the lean ammonia solution, ammonia gas, and the pressure energy in the exhaust gas from the high-pressure turbine outlet. The lean ammonia solution branch is connected to the outlet of the gas-liquid separator to recover and utilize the pressure energy in the lean ammonia solution when operating with a high-pressure liquid working fluid. The gas extraction and regeneration branch is connected to the inlets of the high-pressure and low-pressure turbines to recover and utilize the pressure energy in ammonia gas and the exhaust gas from the high-pressure turbine outlet when operating with a high-pressure gaseous working fluid.

[0010] An electrically controlled valve, comprising a pneumatic three-way electric ball valve and an electric valve, is used to control the flow direction and flow rate of the gaseous working fluid; the electric valve is connected to a hydraulic cylinder to control the sequence in which the gaseous working fluid flows into the hydraulic cylinder; a hydraulic turbine is connected to the hydraulic cylinder to ensure the stability of the transfer fluid entering the hydraulic turbine.

[0011] The ammonia-deficient branch of the hydraulic energy recovery component is equipped with a gas-liquid separator, a regenerator, and a hydraulic turbine. The high-pressure ammonia-deficient solution at the outlet of the gas-liquid separator is connected to the hydraulic turbine after passing through the regenerator, and the pressure energy is used to drive the hydraulic turbine to generate electricity.

[0012] The hydraulic energy recovery component's extraction and reheating branch extracts some steam via a pneumatic three-way electric ball valve, which, combined with some exhaust gas extracted from the high-pressure turbine outlet, adjusts the extraction ratio through a regenerator. This allows the hydraulic device and the high-pressure turbine to work synergistically. Simultaneously, it can increase the extraction ratio in case the high-pressure turbine is at risk of liquefaction, thus providing protection.

[0013] After the electric valve is activated, steam flows into the hydraulic cylinder, which pushes the transfer fluid downwards. The hydraulic fluid does work through the hydraulic turbine, driving the motor to generate electricity. At the outlet of the hydraulic turbine, the low-pressure transfer fluid gradually accumulates in the hydraulic cylinder, and some of the working fluid vapor passes through the absorber and enters the condenser for condensation. After the deep cold seawater cools the mixed working fluid into a liquid state, it is transported by the working fluid pump to the regenerator in the regenerator branch for preheating, and finally enters the evaporator for the next cycle.

[0014] In the gas extraction and regeneration branch, there are two hydraulic cylinders, located between the high-pressure turbine and the low-pressure turbine; there are eight electric valves, installed at the inlet and outlet of the hydraulic cylinders respectively; there is one hydraulic turbine connected to the hydraulic cylinders; there are two level transmitters; and there is one generator connected to the hydraulic turbine to utilize the liquid phase pressure difference and gas phase pressure difference to enable the hydraulic turbine to generate electricity.

[0015] In the exhaust heat recovery branch of the hydraulic energy recovery component, a level transmitter is used to acquire and transmit monitoring signals to control the opening and closing of the electric valve, ensuring that the two hydraulic cylinders work in a reciprocating cycle.

[0016] In the exhaust and heat recovery branch of the hydraulic energy recovery component, the transfer liquid and working fluid are switched between high and low pressure through hydraulic cylinders and electric valves. The transfer liquid flows unidirectionally in the hydraulic turbine, driving the electric motor to generate electricity, thus enabling the hydraulic turbine to work continuously and efficiently.

[0017] This invention employs the aforementioned structure, utilizing the high-pressure lean ammonia solution in the lean ammonia solution branch of the hydraulic energy recovery component to perform work, thereby achieving pressure energy recovery and utilization and improving system efficiency; it achieves pressure energy conversion in the gas extraction and reheating branch of the system through a hydraulic cylinder and a level transmitter, fully recovering and utilizing pressure energy in the thermoelectric power generation system; it generates electricity using ocean thermal energy difference through the thermoelectric power generation component and connects it to the hydraulic energy recovery component; and it recovers and utilizes pressure energy in the lean ammonia solution when working with high-pressure liquid working fluid by connecting the lean ammonia solution branch to the outlet of the gas-liquid separator, offering advantages of flexibility, high efficiency, simplicity, and practicality. Attached image description:

[0018] Figure 1 This is a system schematic diagram of the present invention.

[0019] Figure 2This is a schematic diagram of the hydraulic energy recovery component of the present invention.

[0020] In the diagram, 1. Warm seawater pump; 2. Evaporator; 3. Gas-liquid separator; 4. High-pressure turbine; 5. Low-pressure turbine; 6. Absorber; 7. Condenser; 8. Cold seawater pump; 9. Liquid ammonia storage tank; 10. Working fluid pump; 11. First regenerator; 12. Second regenerator; 13. Third regenerator; 14. Hydraulic turbine; 15. First hydraulic cylinder; 16. Second hydraulic cylinder; 17. Hydraulic turbine; 18. Pressure sensor; 19. Temperature sensor; 20. Flow sensor; 21. Pneumatic three-way electric ball valve; 22. Check valve; 23. Pressure sensor; 24. Temperature sensor; 25. Flow sensor; 26. Pneumatic three-way electric ball valve; 27. Check valve; 28, 29, 30, 31, 32, 33, 34, 35. Electric valve; 36, 37. Level transmitter. Detailed implementation method:

[0021] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0022] like Figure 1-2 As shown, an ocean thermal energy conversion system for recovering and utilizing pressure energy is provided, the system comprising:

[0023] Thermoelectric power generation component, which is used to generate electricity by utilizing ocean thermal energy difference, and is connected to hydraulic energy recovery component, which converts pressure energy through hydraulic cylinder and level transmitter, so as to fully recover and utilize pressure energy in thermoelectric power generation system.

[0024] A hydraulic energy recovery component is provided, which is installed in the lean ammonia solution branch and the gas extraction and regeneration branch, and connected to the thermoelectric power generation component. This component recovers and utilizes the pressure energy in the lean ammonia solution, ammonia gas, and the pressure energy in the exhaust gas from the high-pressure turbine outlet. The lean ammonia solution branch is connected to the outlet of the gas-liquid separator to recover and utilize the pressure energy in the lean ammonia solution when operating with a high-pressure liquid working fluid. The gas extraction and regeneration branch is connected to the inlets of the high-pressure and low-pressure turbines to recover and utilize the pressure energy in ammonia gas and the exhaust gas from the high-pressure turbine outlet when operating with a high-pressure gaseous working fluid.

[0025] An electrically controlled valve, comprising a pneumatic three-way electric ball valve and an electric valve, is used to control the flow direction and flow rate of the gaseous working fluid; the electric valve is connected to a hydraulic cylinder to control the sequence in which the gaseous working fluid flows into the hydraulic cylinder; a hydraulic turbine is connected to the hydraulic cylinder to ensure the stability of the transfer fluid entering the hydraulic turbine.

[0026] The ammonia-deficient branch of the hydraulic energy recovery component is equipped with a gas-liquid separator, a regenerator, and a hydraulic turbine. The high-pressure ammonia-deficient solution at the outlet of the gas-liquid separator is connected to the hydraulic turbine after passing through the regenerator, and the pressure energy is used to drive the hydraulic turbine to generate electricity.

[0027] The hydraulic energy recovery component's extraction and reheating branch extracts some steam via a pneumatic three-way electric ball valve, which, combined with some exhaust gas extracted from the high-pressure turbine outlet, adjusts the extraction ratio through a regenerator. This allows the hydraulic device and the high-pressure turbine to work synergistically. Simultaneously, it can increase the extraction ratio in case the high-pressure turbine is at risk of liquefaction, thus providing protection.

[0028] After the electric valve is activated, steam flows into the hydraulic cylinder, which pushes the transfer fluid downwards. The hydraulic fluid does work through the hydraulic turbine, driving the motor to generate electricity. At the outlet of the hydraulic turbine, the low-pressure transfer fluid gradually accumulates in the hydraulic cylinder, and some of the working fluid vapor passes through the absorber and enters the condenser for condensation. After the deep cold seawater cools the mixed working fluid into a liquid state, it is transported by the working fluid pump to the regenerator in the regenerator branch for preheating, and finally enters the evaporator for the next cycle.

[0029] In the gas extraction and regeneration branch, there are two hydraulic cylinders, located between the high-pressure turbine and the low-pressure turbine; there are eight electric valves, installed at the inlet and outlet of the hydraulic cylinders respectively; there is one hydraulic turbine connected to the hydraulic cylinders; there are two level transmitters; and there is one generator connected to the hydraulic turbine to utilize the liquid phase pressure difference and gas phase pressure difference to enable the hydraulic turbine to generate electricity.

[0030] In the exhaust heat recovery branch of the hydraulic energy recovery component, a level transmitter is used to acquire and transmit monitoring signals to control the opening and closing of the electric valve, ensuring that the two hydraulic cylinders work in a reciprocating cycle.

[0031] In the exhaust and heat recovery branch of the hydraulic energy recovery component, the transfer liquid and working fluid are switched between high and low pressure through hydraulic cylinders and electric valves. The transfer liquid flows unidirectionally in the hydraulic turbine, driving the electric motor to generate electricity, thus enabling the hydraulic turbine to work continuously and efficiently.

[0032] The working principle of an ocean thermal energy conversion system for pressure energy recovery and utilization in this invention embodiment is as follows: Based on the coordinated action of multiple functional modules, a hydraulic system is used for energy conversion. A hydraulic turbine is connected at the location of the ammonia-lean solution branch in the circulation system where a pressure difference exists. The pressure difference drives the hydraulic turbine to perform work. The pumping ratio in the gas extraction and regeneration branch of the circulation system is adjusted by a pneumatic three-way electric ball valve. Pressure energy is converted and utilized using a hydraulic cylinder and a level transmitter, achieving full recovery and utilization of pressure energy in the ocean thermal energy conversion system. This improves the overall power generation efficiency of the cycle and enables more efficient utilization of ocean thermal energy. Compared with a simple pneumatic drive power generation device, it is smaller in weight and volume, and has a faster response speed. The various functional components in the hydraulic system can be conveniently and flexibly arranged according to actual needs, enabling not only a higher degree of automatic control and drive but also remote control, resulting in higher power generation and efficiency. This effectively utilizes ocean thermal energy and achieves stable, continuous, and efficient power generation.

[0033] Because existing pneumatic power generation methods have slow response speed and low power generation efficiency, this application incorporates a hydraulic power generation transmission system to conveniently and flexibly arrange various functional components as needed. By adopting an electro-hydraulic combined control mode, remote control can be achieved, and higher power generation can be achieved.

[0034] The overall solution mainly includes a thermoelectric power generation component, which is used to generate electricity using ocean thermal energy difference and is connected to a hydraulic energy recovery component. The pressure energy is converted through a hydraulic cylinder and a level transmitter to fully recover and utilize the pressure energy in the thermoelectric power generation system.

[0035] A hydraulic energy recovery component is provided, which is installed in the lean ammonia solution branch and the gas extraction and regeneration branch, and connected to the thermoelectric power generation component. This component recovers and utilizes the pressure energy in the lean ammonia solution, ammonia gas, and the pressure energy in the exhaust gas from the high-pressure turbine outlet. The lean ammonia solution branch is connected to the outlet of the gas-liquid separator to recover and utilize the pressure energy in the lean ammonia solution when operating with a high-pressure liquid working fluid. The gas extraction and regeneration branch is connected to the inlets of the high-pressure and low-pressure turbines to recover and utilize the pressure energy in ammonia gas and the exhaust gas from the high-pressure turbine outlet when operating with a high-pressure gaseous working fluid.

[0036] An electrically controlled valve, comprising a pneumatic three-way electric ball valve and an electric valve, is used to control the flow direction and flow rate of the gaseous working fluid; the electric valve is connected to a hydraulic cylinder to control the sequence in which the gaseous working fluid flows into the hydraulic cylinder; a hydraulic turbine is connected to the hydraulic cylinder to ensure the stability of the transfer fluid entering the hydraulic turbine.

[0037] In actual use, the warm seawater pump 1, which is matched with the pump, pumps the surface warm seawater into the evaporator 2. The surface warm seawater in the evaporator 2 heats the mixed working fluid into a gas-liquid two-phase mixed working fluid. The gas-liquid two-phase mixed working fluid is separated into ammonia gas and lean ammonia solution in the gas-liquid separator 3. The ammonia gas is regulated to a stable flow rate by the pneumatic three-way electric ball valve 21 and then enters the high-pressure turbine 4 to do work. The lean ammonia solution enters the gas extraction and heat recovery branch, passes through the first regenerator 11, and drives the hydraulic turbine 14 to do work. The exhaust gas after the ammonia gas has done work in the high-pressure turbine 4 is partially extracted and enters the gas extraction and heat recovery branch. At the same time, it enters the pressure energy utilization system and drives the hydraulic turbine 17 to do work through the hydraulic cylinder 16. The remaining exhaust gas enters the low-pressure turbine 5 to do work.

[0038] In the absorber 6, the working fluid from the two exhaust gas regeneration branches mixes with the exhaust gas discharged from the low-pressure turbine 5 and enters the condenser 7. The deep cold seawater cools the mixed working fluid into a liquid state, and then the working fluid is pumped by the working fluid pump 10 to the third regenerator 13 of the exhaust gas regeneration branch for preheating, and then enters the evaporator 2 to enter the next cycle.

[0039] The sensor monitors the gaseous working fluid coming out of the gas-liquid separator and uses this information to control the stability of the inlet flow of the high and low pressure turbines 4 and 5. After comparing the monitoring data from pressure sensors with the optimal operating conditions, the sensor controls the opening of the pneumatic three-way electric ball valves 21 and 26, adjusts the set air extraction ratio, and realizes the coordinated action of the hydraulic device and the secondary turbine. At the same time, it can increase the air extraction ratio in case the secondary turbine may have a risk of liquefaction, thus playing a protective role.

[0040] Part of the extracted steam and part of the exhaust gas extracted from the turbine outlet pass through the third regenerator 13, opening electric valves 31, 35, 32, and 28. The steam flows into the second hydraulic cylinder 16, where it pushes the transfer fluid downwards. The hydraulic fluid performs work through the hydraulic turbine 17, driving the motor to generate electricity.

[0041] At the outlet of the hydraulic turbine, the low-pressure transfer fluid gradually accumulates in the first hydraulic cylinder 15. Part of the working fluid vapor in this volume enters the condenser through the absorber for condensation. Deep cold seawater cools the mixed working fluid into a liquid state, which is then pumped by the working fluid pump to the regenerator in the regenerative branch for preheating, before entering the evaporator for the next cycle. When the level transmitter 36 detects that the transfer fluid in the first hydraulic cylinder 15 has reached a certain level, the electric valves 31, 35, 32, and 28 close.

[0042] When a new round of circulating steam flows in, electric valves 29, 34, 33, and 30 receive the monitoring signal from the level transmitter 36 and open, allowing steam to flow into the hydraulic cylinder 15 and push the transfer liquid downwards. The hydraulic fluid generates electricity through the hydraulic turbine 17. At the outlet of the hydraulic turbine, the hydraulic fluid gradually accumulates in the hydraulic cylinder 16. Part of the working fluid vapor in this volume passes through the absorber and enters the condenser for condensation, thus achieving circulation. When the level transmitter 37 detects that the transfer liquid in the hydraulic cylinder 16 has reached a certain level, electric valves 29, 34, 33, and 30 close, and electric valves 31, 35, 32, and 28 open, at which point the system repeats the above process.

[0043] Preferably, the lean ammonia solution branch of the hydraulic energy recovery component is equipped with a gas-liquid separator, a regenerator and a hydraulic turbine. The high-pressure lean ammonia solution at the outlet of the gas-liquid separator is connected to the hydraulic turbine after passing through the regenerator, and the pressure energy is used to drive the hydraulic turbine to generate electricity.

[0044] Specifically, in the gas extraction and regeneration branch, there are two hydraulic cylinders, located between the high-pressure turbine and the low-pressure turbine; there are eight electric valves, installed at the inlet and outlet of the hydraulic cylinders respectively; there is one hydraulic turbine connected to the hydraulic cylinders; there are two level transmitters; and there is one generator connected to the hydraulic turbine, so as to use the liquid phase pressure difference and gas phase pressure difference to make the hydraulic turbine do work and generate electricity.

[0045] It should be noted that in the exhaust heat recovery branch of the hydraulic energy recovery component, the transfer liquid and working fluid are switched between high and low pressure through hydraulic cylinders and electric valves. The transfer liquid flows unidirectionally in the hydraulic turbine, driving the electric motor to generate electricity, so as to realize the continuous and efficient operation of the hydraulic turbine.

[0046] In summary, the ocean thermal energy conversion system for pressure energy recovery and utilization in this embodiment of the invention is based on the coordinated operation of multiple functional modules. It employs a hydraulic system for energy conversion, connecting a hydraulic turbine at a pressure differential point in the ammonia-lean solution branch of the circulation system. This pressure differential drives the hydraulic turbine to perform work. The pumping ratio in the gas extraction and regeneration branch of the circulation system is adjusted via a pneumatic three-way electric ball valve. Pressure energy is converted and utilized using a hydraulic cylinder and a level transmitter, achieving full recovery and utilization of pressure energy in the ocean thermal energy conversion system. This improves the overall power generation efficiency of the cycle and enables more efficient utilization of ocean thermal energy. Compared to a purely pneumatically driven power generation device, it is smaller and has a faster response speed. The various functional components in the hydraulic system can be conveniently and flexibly arranged according to actual needs, enabling not only a higher degree of automatic control and drive but also remote control, resulting in higher power generation and efficiency. This effectively utilizes ocean thermal energy and achieves stable, continuous, and efficient power generation.

[0047] The above specific embodiments should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0048] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A marine thermal energy conversion system for recovering and utilizing pressure energy, characterized in that, The power generation system includes: Thermoelectric power generation component, which is used to generate electricity by utilizing ocean thermal energy difference, and is connected to hydraulic energy recovery component, which converts pressure energy through hydraulic cylinder and level transmitter, so as to fully recover and utilize pressure energy in thermoelectric power generation system. A hydraulic energy recovery component is provided, which is installed in the lean ammonia solution branch and the gas extraction and regeneration branch, and connected to the thermoelectric power generation component. This component recovers and utilizes the pressure energy in the lean ammonia solution, ammonia gas, and the pressure energy in the exhaust gas from the high-pressure turbine outlet. The lean ammonia solution branch is connected to the outlet of the gas-liquid separator to recover and utilize the pressure energy in the lean ammonia solution when operating with a high-pressure liquid working fluid. The gas extraction and regeneration branch is connected to the inlets of the high-pressure and low-pressure turbines to recover and utilize the pressure energy in ammonia gas and the exhaust gas from the high-pressure turbine outlet when operating with a high-pressure gaseous working fluid. An electrically controlled valve, comprising a pneumatic three-way electric ball valve and an electric valve, is used to control the flow direction and flow rate of the gaseous working fluid; the electric valve is connected to a hydraulic cylinder to control the sequence in which the gaseous working fluid flows into the hydraulic cylinder; a hydraulic turbine is connected to the hydraulic cylinder to ensure the stability of the transfer fluid entering the hydraulic turbine; The lean ammonia solution branch of the hydraulic energy recovery component is equipped with a gas-liquid separator, a regenerator and a hydraulic turbine. The high-pressure lean ammonia solution at the outlet of the gas-liquid separator is connected to the hydraulic turbine after passing through the regenerator. The pressure energy is used to drive the hydraulic turbine to do work and generate electricity. In the gas extraction and regeneration branch, there are two hydraulic cylinders, located between the high-pressure turbine and the low-pressure turbine; there are eight electric valves, installed at the inlet and outlet of the hydraulic cylinders respectively; there is one hydraulic turbine connected to the hydraulic cylinders; there are two level transmitters; and there is one generator connected to the hydraulic turbine to utilize the liquid phase pressure difference and gas phase pressure difference to enable the hydraulic turbine to generate electricity.

2. The ocean thermal energy conversion system for recovering and utilizing pressure energy according to claim 1, characterized in that: The hydraulic energy recovery component's extraction and reheating branch extracts some steam via a pneumatic three-way electric ball valve, which, combined with some exhaust gas extracted from the high-pressure turbine outlet, adjusts the extraction ratio through a regenerator. This allows the hydraulic device and the high-pressure turbine to work synergistically. Simultaneously, it can increase the extraction ratio in case the high-pressure turbine is at risk of liquefaction, thus providing protection.

3. The ocean thermal energy conversion system for pressure energy recovery and utilization according to claim 1, characterized in that: After the electric valve is activated, steam flows into the hydraulic cylinder, which pushes the transfer fluid downwards. The hydraulic fluid does work through the hydraulic turbine, driving the motor to generate electricity. At the outlet of the hydraulic turbine, the low-pressure transfer fluid gradually accumulates in the hydraulic cylinder, and some of the working fluid vapor passes through the absorber into the condenser for condensation. After the deep cold seawater cools the mixed working fluid into a liquid state, it is transported by the working fluid pump to the regenerator in the regenerator branch for preheating, and finally enters the evaporator for the next cycle.

4. The ocean thermal energy conversion system for pressure energy recovery and utilization according to claim 1, characterized in that: In the exhaust heat recovery branch of the hydraulic energy recovery component, a level transmitter is used to acquire and transmit monitoring signals to control the opening and closing of the electric valve, ensuring that the two hydraulic cylinders work in a reciprocating cycle.

5. The ocean thermal energy conversion system for recovering and utilizing pressure energy according to claim 1, characterized in that: In the exhaust and reheating branch of the hydraulic energy recovery component, the transfer liquid and working fluid are switched between high and low pressure through hydraulic cylinders and electric valves. The transfer liquid flows unidirectionally in the hydraulic turbine, driving the generator to generate electricity and enabling the hydraulic turbine to work continuously and efficiently.

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