Nuclear-powered LNG floating regasification unit (LNG-FSRU) regasification system

Abstract

A regasification system of a liquefied natural gas floating regasification unit (LNG-FSRU) based on nuclear power includes a steam generation module and an LNG gasification system. A nuclear reactor is arranged in the reactor compartment of the steam generation module, and the nuclear reactor is connected to a steam generator in sequence. The steam generator generates 40bar-80bar saturated steam, and the heat of the 40bar-80bar saturated steam is provided to a power generation system, a pump group turbine system, and an LNG gasification system. The LNG-FSRU regasification system applies the heat energy generated by nuclear energy to the power generation system, the turbine system, and the propane and water glycol medium heating system based on the steam medium of the floating device. At the same time, the nuclear power cooling system absorbs the cold energy released by the regasification system. While saving energy and reducing emissions, the seawater heat exchange load of the nuclear power cooling system can be greatly reduced, and the damage to the ecological environment can be reduced from multiple angles. The system is not only stable and reliable, and uses cold and heat energy efficiently, but also energy-saving and environmentally friendly, and reduces pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of liquefied natural gas floating regasification, and in particular to a regasification system of a liquefied natural gas floating regasification device based on nuclear power. Background Art

[0002] At present, with the increasing use of clean energy LNG, the market demand for LNG receiving terminals is also increasing. Due to various restrictions on the construction of onshore LNG receiving terminals in coastal areas, the construction of offshore natural gas floating storage and regasification units (LNG-FSRU) has become a more economical and convenient solution, and has gradually been promoted and applied in the field of LNG engineering technology at home and abroad.

[0003] In recent years, many oil and gas companies, shipyards, design companies and equipment manufacturers have conducted research on the safety and design features of LNG-FSRU and have achieved research results in many fields. Among them, the mainstream research directions of the evaporator, the core equipment of the LNG-FSRU regasification system, include using heated seawater to exchange heat with LNG in the heating pipeline, using steam generated by steam boilers to exchange heat with LNG in shell and tube steam heating evaporators, and using seawater to directly heat propane or butane and then exchange heat with LNG. The former two require a large amount of fossil fuels as a heat source during the heat exchange process, and the latter causes harm to the marine environment due to the large amount of heated seawater discharged after heat exchange. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system, which aims to use nuclear power as energy, avoid consuming a large amount of fossil fuels and causing damage to the marine environment. The technical solution adopted is:

[0005] A nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system comprises a steam generation module, a nuclear reactor is arranged in the reactor compartment of the steam generation module, and the nuclear reactor is connected with a steam generator and a main circulation pump in sequence to form a first circulation network; the steam generator generates saturated steam of 40 bar to 80 bar, and the heat of the 40 bar to 80 bar saturated steam enters a power generation system, a pump group turbine system, and a LNG gasification system respectively.

[0006] The steam generator is connected in sequence to the throttling device, the pump group turbine, the first water glycol heater, the seawater condenser, the condensate pump, the warm water tank, the deaerator, the feed water pump, and the high-pressure feed water heater to form a second circulation network.

[0007] The steam generator is connected in sequence to the generator turbine, the first water glycol heater, the seawater condenser, the condensate pump, the warm water tank, the deaerator, the feed water pump, and the high-pressure feed water heater to form a third circulation network.

[0008] The other end of the seawater condenser is connected to seawater. Seawater in the sea is pumped into the seawater condenser through the condenser seawater pump, and then flows out of the seawater condenser and flows back to the sea.

[0009] A fourth valve is provided on the pipeline from the pump group turbine and the generator turbine to the first water glycol heater, a third valve and a seventh valve are provided in sequence on the pipeline from the first water glycol to the seawater condenser, a second valve is connected between the pipeline from the pump group turbine and the generator turbine to the first water glycol heater and the pipeline from the first water glycol to the seawater condenser, a sixth valve is provided on the pipeline from the seawater condenser to the condensate water pump, and a fifth valve is connected between the pipeline from the first water glycol to the seawater condenser and the pipeline from the seawater condenser to the condensate water pump.

[0010] The steam generator is connected to the second water glycol heater and the seawater condenser in the water glycol closed circulation heating loop in sequence via a throttling device. A first valve is provided on the pipeline from the steam generator to the second water glycol heater. The water glycol closed circulation heating loop is that the second water glycol heater is connected to the propane heater and the propane evaporator respectively, and then connected to the propane heater and the propane evaporator and then merged into the water glycol expansion tank. The water glycol expansion tank is connected to the water glycol delivery pump and the first water glycol heater in sequence, and refluxes to the second water glycol heater to form a water glycol closed circulation heating loop.

[0011] The propane heater is connected to the natural gas heater, the propane evaporator, the LNG evaporator, the propane tank, and the propane delivery pump in sequence through pipelines. The propane delivery pump refluxes to the propane heater to form a propane closed-cycle heating loop.

[0012] The LNG gasification system includes a propane closed-cycle heating circuit, a water-glycol closed-cycle heating circuit, and an LNG liquid cargo tank. An LNG transfer pump is installed in the LNG liquid cargo tank. The LNG transfer pump is connected to the suction tank, LNG booster pump, BOG recondenser, LNG evaporator, natural gas heater, and metering skid in sequence through pipelines.

[0013] In the above-mentioned nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system, further, a pipeline extends out of the BOG recondenser to flow back to the suction tank.

[0014] The above-mentioned nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system further has pressurizers arranged in the first circulation network on the path from the main circulation pump to the reactor and on the path from the reactor to the steam generator.

[0015] In the above-mentioned nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system, further, the nuclear reactor is a pressurized water reactor, and the heat carrier medium is water pressurized to 15-20 MPa.

[0016] In the above-mentioned nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system, further, the fresh water tank is connected to the fresh water pump and the warm water tank in sequence through pipelines, and a warm water tank control valve is provided between the fresh water pump and the warm water tank.

[0017] The above-mentioned nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system, further, has water medium flowing in the first circulation network, the second circulation network, and the third circulation network, propane medium flowing in the propane closed circulation heating loop, and water glycol medium flowing in the water glycol closed circulation heating loop.

[0018] In the above-mentioned nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system, further, a BOG pipeline connected to the BOG recondenser extends from the suction tank.

[0019] In the above-mentioned nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system, further, a BOG pipeline extends out of the LNG cargo tank and enters the BOG recondenser through the BOG gas compressor.

[0020] The above-mentioned nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system further comprises a first liquid level sensor disposed in the warm water tank, and the first liquid level sensor is connected to a signal of a warm water tank control valve.

[0021] The above-mentioned nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system further comprises a second liquid level sensor disposed in the steam generator, and the second liquid level sensor is connected to the feed water control valve via a signal.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention uses nuclear power as the heat energy source of the regasification system of the LNG floating regasification unit, replacing the previous energy acquisition structure that uses burning fossil fuels or absorbing seawater heat. The system is energy-saving and environmentally friendly, reduces pollution, and avoids damage to the marine environment caused by the large-scale discharge of low-temperature seawater after heat exchange.

[0024] 2. The present invention makes comprehensive and efficient use of the heat energy of the steam generation module and the cold energy of the LNG regasification module. The LNG regasification module recycles the low-temperature exhaust steam heat energy after the steam generation module does work. Compared with the traditional nuclear power system, the large amount of low-temperature heat energy carried by the exhaust steam is recycled and utilized, thereby improving the thermal efficiency of nuclear energy. At the same time, the heat exchange between the steam cooling system and seawater is reduced, thereby improving the damage to the marine environment caused by the large-scale discharge of high-temperature seawater.

[0025] 3. This system uses nuclear energy as the power source for the entire ship. The high-temperature saturated steam generated by the steam generator is used in the LNG gasification module, and is also efficiently used in the various pump groups and power generation systems of the FSRU. The system has a high nuclear energy utilization rate and is economically attractive. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a system diagram of the present invention;

[0027] Among them: 1-nuclear reactor, 2-steam generator, 3-main circulation pump, 4-pressure regulator, 5-throttling device, 6-pump group turbine, 7-generator turbine, 8-first water glycol heater, 9-seawater condenser, 10-condensate pump, 11-warm water tank, 12-deaerator, 13-feed water pump, 14-high pressure feed water heater, 15-feed water control valve, 16-condenser seawater pump, 17-warm water tank control valve, 18-fresh water pump, 19-fresh water tank, 20-second water glycol heater, 21-water glycol delivery pump, 22-water glycol expansion tank, 23-propane heater, 24-propane evaporator, 25-propane transfer pump, 26-propane tank, 27-LNG evaporator, 28-natural gas heating, 29-metering skid, 30-LNG liquid cargo tank, 31-LNG transfer pump, 32-suction tank, 33-LNG booster pump, 34-BOG recondenser, 35-BOG gas compressor, 36-first valve, 37-second valve, 38-third valve, 39-fourth valve, 40-fifth valve, 41-sixth valve, 42-seventh valve, 43-BOG pipeline, 44-generator. DETAILED DESCRIPTION

[0028] The present invention will be further described in conjunction with the accompanying drawings.

[0029] Example 1

[0030] like Figure 1A nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system is shown, which has a reactor compartment in which a nuclear reactor is arranged. The nuclear reactor adopts a conventional pressurized water reactor. The pressurized water reactor is connected to a steam generator and a main circulation pump in sequence through pipelines. The main circulation pump returns to the pressurized water reactor to form a first circulation network. A stabilizer is arranged between a passage from the main circulation pump to return to the pressurized water reactor and a passage from the pressurized water reactor to the steam generator. The stabilizer is used to prevent the pressure in the first circulation network from being too high to damage the equipment and from being too low to cause boiling of the coolant.

[0031] The steam generator is connected to the throttling device, the pump group turbine, the first water glycol heater, the seawater condenser, the condensate pump, the warm water tank heating, the deaerator, the feed water pump, and the high-pressure feed water heater in sequence through pipelines. The high-pressure feed water heater returns to the steam generator to form a second circulation network. The steam generator is connected to the generator turbine, the first water glycol heater, the seawater condenser, the condensate pump, the warm water tank heating, the deaerator, the feed water pump, and the high-pressure feed water heater in sequence through pipelines. The high-pressure feed water heater returns to the steam generator to form a third circulation network. The heat carrier medium circulating in the first circulation network, the second circulation network, and the third circulation network is water. The generator turbine is also connected to the generator through a pipeline.

[0032] The other end of the seawater condenser is connected to seawater, and the seawater is pumped into the seawater condenser through the condenser seawater pump. After heat exchange in the seawater condenser, the heated seawater flows back to the sea. The other end of the warm water tank is connected to the fresh water tank. A fresh water pump and a warm water tank control valve are arranged between the fresh water tank and the warm water tank. A first liquid level sensor is arranged in the warm water tank, and the first liquid level sensor is connected to the warm water tank control valve. The first liquid level sensor in the warm water tank is connected to the warm water tank control valve. The first liquid level sensor sends a liquid level signal to the warm water tank control valve. When the water level is too low, the warm water tank control valve is automatically opened. Fresh water is pumped from the fresh water tank into the warm water tank by the fresh water pump. After low-temperature heating in the warm water tank, the heat-carrying medium is deoxygenated by the deaerator, and then pumped into the high-pressure feed water heater by the feed water pump for heating. After the heat-carrying medium is heated by the high-pressure feed water heater, it forms a heat-carrying medium with a pressure of 70 bar to 120 bar and enters the steam generator. The steam generator is provided with a second liquid level sensor, which is connected to the feed water control valve signal. The second liquid level sensor sends a liquid level signal to the feed water control valve, and the feed water control valve replenishes the heat carrier medium into the steam generator in real time according to the liquid level signal. The heat carrier medium enters the steam generator, and after heat exchange and evaporation with the 15-20mpa water coming out of the pressurized water reactor, 40bar-80bar saturated steam and cooled heat carrier medium are formed respectively. The 40bar-80bar saturated steam enters the second circulation network (that is, the 40bar-80bar saturated steam is provided to the pump group turbine system, and the high-temperature saturated steam drives the pump group turbine, driving the LNG delivery pump, LNG booster pump, propane delivery pump, water glycol delivery pump, condensate pump, fresh water pump, feed water pump, condenser seawater pump to operate), and the third circulation network continues to circulate. Saturated steam of 40bar-80bar is provided to the power generation system, doing work in the generator turbine, converting the thermal energy of the steam into mechanical energy. The generator turbine rotor is connected to the generator, converting the mechanical energy into electrical energy for the ship's instruments, life and lighting. The cooled heat carrier medium is pumped into the pressurized water reactor through the main circulation pump for heating, and continues to circulate in the first circulation network.

[0033] The steam generator is connected to the second water glycol heater through a pipeline via a throttling device. A first valve is provided on the passage from the steam generator to the second water glycol heater. After saturated steam of 40 bar to 80 bar comes out of the steam generator, it enters the second water glycol heater for heat exchange. The low-temperature heat medium formed after the heat exchange flows back to the seawater condenser, and the condensing water pump pumps the low-temperature heat medium into the warm water tank for heating.

[0034] A fourth valve is provided on the passage from the pump group turbine and the generator turbine to the first water glycol heater, a third valve and a seventh valve are provided in sequence on the passage from the first water glycol heater to the seawater condenser, a sixth valve is provided on the passage from the seawater condenser to the warm water tank, a second valve is connected between the passage from the pump group turbine and the generator turbine to the first water glycol heater and the passage from the first water glycol heater to the seawater condenser, a fifth valve is connected between the passage from the first water glycol heater to the seawater condenser and the passage from the seawater condenser to the warm water tank. The second valve is connected in parallel with the fourth valve and the third valve; the fifth valve is connected in parallel with the seventh valve and the sixth valve.

[0035] The LNG gasification system includes a propane closed-cycle heating circuit, a water-glycol closed-cycle heating circuit, and an LNG cargo tank. An LNG delivery pump is installed in the LNG cargo tank, and the LNG delivery pump is connected to the suction tank, LNG booster pump, BOG recondenser, LNG evaporator, natural gas heater, and metering skid in sequence through pipelines. A BOG pipeline extends from the top of the LNG cargo tank, and the BOG pipeline enters the BOG recondenser through the BOG gas compressor, and then enters the suction tank through the BOG recondenser; a BOG pipeline also extends from the top of the suction tank, and the BOG pipeline enters the suction tank through the BOG recondenser.

[0036] The water glycol closed circulation heating loop includes a second water glycol heater, which is connected to the propane heater and the propane evaporator through pipelines respectively, and then merged into a water glycol expansion tank after being connected to the propane heater and the propane evaporator. The water glycol expansion tank is connected to the water glycol delivery pump and the first water glycol heater in sequence through pipelines, and then refluxes to the second water glycol heater to form a water glycol closed circulation heating loop.

[0037] The propane heater is connected to the natural gas heater, propane evaporator, LNG evaporator, propane tank and propane delivery pump in sequence through pipelines. The propane delivery pump returns to the propane heater to form a propane closed circulation heating loop. The propane closed circulation heating loop has propane heat transfer medium flowing through it, and the water glycol closed circulation heating loop has water glycol heat transfer medium flowing through it.

[0038] When LNG-FSRU needs to gasify LNG, the third valve and the fourth valve are opened, and the second valve is closed. The exhaust steam after the pump group turbine in the first circulation network and the generator turbine in the second circulation network work enters the first water glycol heater through the fourth valve to heat the water glycol heat medium in the LNG gasification system, and heat is exchanged in the first water glycol heater. The condensate or steam-water mixture after heat exchange flows through the third valve. When the exhaust steam heat generated by the first circulation network and the second circulation network is not enough to meet the heat demand of the LNG gasification system, the first valve is opened, and the high-temperature saturated steam enters the second water glycol heater through the throttling device and the first valve, and heat is exchanged with the water glycol medium heated in the first water glycol heater in the second water glycol heater, and the water glycol medium continues to heat up.

[0039] The condensate or steam-water mixture after heat exchange merges with the condensate or steam-water mixture flowing through the third valve. When the merged product is condensate, the fifth valve is opened, and the sixth and seventh valves are closed. The condensate flows through the fifth valve and is pumped into the warm water tank by the condensate water pump for heating. When the merged product is a steam-water mixture, the sixth and seventh valves are opened, and the fifth valve is closed. The steam-water mixture enters the seawater condenser, exchanges heat with low-temperature seawater in the seawater condenser and condenses into water. The condensed water is pumped into the warm water tank by the condensate water pump for heating. The low-temperature seawater is pumped into the condenser by the condensation seawater pump and circulated back to the sea after heat exchange.

[0040] When the LNG-FSRU does not need to gasify LNG, the first valve, the third valve, the fourth valve, and the fifth valve are closed, and the second valve, the sixth valve, and the seventh valve are opened. The exhaust steam after the pump unit turbine in the first circulation network and the generator turbine in the second circulation network work passes through the second valve and the seventh valve, and condenses into water in the seawater condenser through heat exchange with low-temperature seawater. The condensed water is pumped into the warm water tank by the condensing water pump for heating, and the low-temperature seawater is pumped into the condenser by the condensing seawater pump, and circulates back to the sea after heat exchange.

[0041] The LNG gasification system of the present invention is a propane and water glycol medium heating system based on steam medium. The water glycol closed heating loop circulates through a pump system, and transfers the heat obtained by heat exchange with the steam generation module to the propane closed heating loop on the deck, and the propane closed heating loop transfers the heat to the LNG liquid to gasify it.

[0042] When FSRU needs to gasify LNG, the low-temperature LNG liquid at -163℃ in the LNG cargo tank is transported to the suction tank on the deck through the LNG transfer pump, and then pressurized by the LNG booster pump and flows through the BOG recondenser. The LNG after flowing through the BOG recondenser is heated to -6℃ by the propane medium in the LNG evaporator. In this process, the gaseous propane medium is cooled into liquid propane; the -6℃ LNG enters the natural gas heater, and the -6℃ LNG is heated to 3℃ natural gas in the natural gas heater. This process uses liquid propane for heating; the 3℃ natural gas after heating can be transported to the shore station through the metering skid. The BOG gas generated in the LNG cargo tank is pressurized by the BOG gas compressor and merged with the BOG gas generated in the suction tank. In the BOG recondenser, it is heat-exchanged with the pressurized LNG liquid to become liquid and return to the suction tank.

[0043] In the propane closed cycle heating loop, low-temperature propane is pumped out of the propane tank by a propane delivery pump and delivered to the propane heater. In the propane heater, it exchanges heat with the water glycol medium to increase its temperature. The heated propane liquid exchanges heat with -6°C LNG in the natural gas heater to cool it down. Then, it is heated to gaseous state by the water glycol medium again in the propane evaporator. The gaseous propane exchanges heat with the low-temperature LNG in the LNG evaporator and becomes liquid and returns to the propane tank, forming a closed loop. Water glycol heats propane in the propane heater and propane evaporator at the same time, which can improve the heat exchange efficiency.

[0044] In the water glycol closed cycle heating loop, low-temperature water glycol is pumped out from the water glycol expansion tank by the water glycol delivery pump, and is heated by the first water glycol heater, the second water glycol heater and the high-temperature steam through heat exchange. The heated water glycol heat carrier medium enters the propane heater and the propane evaporator respectively, and is cooled by heat exchange with propane at the same time. After cooling, it returns to the water glycol expansion tank to form a closed loop.

[0045] The present invention uses nuclear energy as the power source for the entire ship. The high-temperature saturated steam generated by the steam generator is applied to the LNG gasification module, and is also efficiently applied to the various pump groups and power generation systems of the FSRU. The system has a high nuclear energy utilization rate and is economical. The LNG-FSRU regasification system applies the heat energy generated by nuclear energy to the power generation system of the floating device, the turbine system, and the propane and water glycol medium heating system based on the steam medium. At the same time, the nuclear power cooling system absorbs the cold energy released by the regasification system. While saving energy and reducing emissions, it can greatly reduce the seawater heat exchange load of the nuclear power cooling system and reduce the damage to the ecological environment from multiple angles. The system is not only stable and reliable, and uses cold and heat energy efficiently, but also saves energy and protects the environment, reducing pollution.

[0046] The LNG gasification system is combined with the steam generation module. The LNG gasification system first recycles the low-temperature exhaust steam heat energy after the steam generation module does work, reduces the exhaust steam temperature generated by the steam generation module, and then enters the seawater condenser to reduce the heat exchange between the steam cooling system and the seawater, thereby improving the damage to the marine environment caused by the large-scale discharge of high-temperature seawater. Compared with the traditional nuclear power system, the steam generation module in the present invention can recycle a large amount of low-temperature heat energy carried by the exhaust steam, thereby improving the thermal efficiency of nuclear energy.

Claims

1. A nuclear-powered liquefied natural gas floating regasification unit (LNG-FSRU) regasification system, characterized in that: There is a steam generation module, a nuclear reactor is arranged in the reactor compartment of the steam generation module, and the nuclear reactor is connected with the steam generator and the main circulation pump in sequence to form a first circulation network; the steam generator generates saturated steam of 40bar-80bar, and the heat of the saturated steam of 40bar-80bar enters the power generation system, the pump group turbine system, and the LNG gasification system respectively; The steam generator is connected in sequence with the throttling device, the pump group turbine, the first water glycol heater, the seawater condenser, the condensate pump, the warm water tank, the deaerator, the feed water pump, and the high-pressure feed water heater to form a second circulation network; The steam generator is connected to the generator turbine, the first water glycol heater, the seawater condenser, the condensate pump, the warm water tank, the deaerator, the feed water pump, and the high-pressure feed water heater in sequence to form a third circulation network. A feed water control valve is provided between the high-pressure feed water heater and the steam generator. The other end of the seawater condenser is connected to seawater. The seawater in the sea is pumped into the seawater condenser through the condenser seawater pump, and then flows out of the seawater condenser and flows back to the sea. A fourth valve is provided on the pipeline from the pump group turbine and the generator turbine to the first water glycol heater, a third valve and a seventh valve are provided in sequence on the pipeline from the first water glycol to the seawater condenser, a second valve is connected between the pipeline from the pump group turbine and the generator turbine to the first water glycol heater and the pipeline from the first water glycol to the seawater condenser, a sixth valve is provided on the pipeline from the seawater condenser to the condensate water pump, and a fifth valve is connected between the pipeline from the first water glycol to the seawater condenser and the pipeline from the seawater condenser to the condensate water pump; The steam generator is connected to the second water glycol heater and the seawater condenser in the water glycol closed circulation heating loop in sequence via a throttling device. A first valve is provided on the pipeline from the steam generator to the second water glycol heater. The water glycol closed circulation heating loop is that the second water glycol heater is connected to the propane heater and the propane evaporator respectively, and then connected to the propane heater and the propane evaporator and then merged to the water glycol expansion tank. The water glycol expansion tank is connected to the water glycol delivery pump and the first water glycol heater in sequence, and refluxes to the second water glycol heater to form a water glycol closed circulation heating loop. The propane heater is connected to the natural gas heater, the propane evaporator, the LNG evaporator, the propane tank, and the propane delivery pump in sequence through pipelines. The propane delivery pump refluxes to the propane heater to form a propane closed cycle heating loop. The LNG gasification system includes a propane closed-cycle heating circuit, a water-glycol closed-cycle heating circuit, and an LNG liquid cargo tank. An LNG transfer pump is installed in the LNG liquid cargo tank. The LNG transfer pump is connected to the suction tank, LNG booster pump, BOG recondenser, LNG evaporator, natural gas heater, and metering skid in sequence through pipelines.

2. The nuclear-powered LNG floating regasification unit (LNG-FSRU) regasification system according to claim 1, characterized in that: There is a pipeline extending from the BOG recondenser to return to the suction tank.

3. The nuclear-powered LNG-FSRU regasification system according to claim 1, characterized in that: The nuclear reactor is a pressurized water reactor, and the heat carrier medium is water pressurized to 15-20 MPa.

4. The nuclear-powered LNG-FSRU regasification system according to claim 1, characterized in that: The fresh water tank is connected to the fresh water pump and the warm water tank in sequence through pipelines, and a warm water tank control valve is provided between the fresh water pump and the warm water tank.

5. The nuclear-powered LNG-FSRU regasification system according to claim 1, characterized in that: Water medium flows through the first circulation network, the second circulation network and the third circulation network, propane medium flows through the propane closed circulation heating loop, and water glycol medium flows through the water glycol closed circulation heating loop.

6. The nuclear-powered LNG-FSRU regasification system according to claim 1, characterized in that: A BOG pipeline connected to the BOG recondenser extends from the suction tank.

7. The nuclear-powered LNG-FSRU regasification system according to claim 1, characterized in that: A BOG pipeline extends from the LNG cargo tank and enters the BOG recondenser through the BOG gas compressor.

8. The nuclear-powered LNG-FSRU regasification system according to claim 5, characterized in that: A first liquid level sensor is arranged in the warm water tank, and the first liquid level sensor is connected with a signal of a control valve of the warm water tank.

9. The nuclear-powered LNG-FSRU regasification system according to claim 1, characterized in that: A second liquid level sensor is arranged in the steam generator, and the second liquid level sensor is connected to the water supply control valve through a signal.

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