An LNG dual-fuel powered ship gas supply and energy recovery system

Abstract

The present invention discloses an LNG dual-fuel powered ship gas supply and energy recovery system, which includes an LNG dual-fuel engine gas supply unit and a BOG gas supply and energy recovery unit. The gas supply process of the LNG powered ship is optimized and designed, and an LNG pump pool with a cooling pipe is innovatively designed. The heat energy of the engine cylinder jacket water in the expansion water tank is used to provide a heat source for the gasifier and BOG heat exchanger and heat the BOG. ​​The liquid nitrogen in the liquid nitrogen storage tank of the nitrogen storage skid in the filling area is used to cool the compressed BOG. ​​The nitrogen expands after absorbing the compression heat, performs work, cools down, throttles, and reliquefies. Through the integrated design of multiple units, the system improves the gas supply efficiency and energy utilization of the system, reduces losses in the gas supply process, realizes energy recovery and multi-stage utilization, and saves energy and reduces emissions.

Description

Technical Field

[0001] The present invention belongs to the technical field of LNG, and in particular relates to a gas supply and energy recovery system for an LNG dual-fuel powered ship. Background Art

[0002] At present, the shipping industry and its exhaust emissions are causing serious environmental pollution. In order to solve this problem at the source, using liquefied natural gas (LNG) as a ship propulsion fuel has become an international trend and research hotspot. LNG, a power ship fuel, is stored in a storage tank at -163°C. Due to the heat resistance of the storage tank and the shaking of the ship during navigation, part of the LNG fuel absorbs heat and flashes to BOG. ​​The generation of BOG has an important impact on the safety of the LNG storage tank and the gas supply system, and its direct emission or combustion pollutes the atmospheric environment. Patent application CN202110285912.8 discloses a dual-fuel engine LNG gas supply system and an LNG ship, but it does not treat the BOG generated during the gas supply process. Most of the existing technologies currently use the method of nitrogen expansion and re-liquefaction of BOG for recovery. Although this recovery method can effectively treat BOG to a certain extent, the operating cost is high and a lot of usable energy is wasted. Patent application CN202210934094.4 discloses a marine BOG cold storage and reliquefaction system and method, but does not mention any direct BOG pre-cooling and gas supply. Patent application CN202023173535.9 discloses a liquid nitrogen cooling liquefied natural gas system, but does not mention any energy recovery from the nitrogen after heat exchange.

[0003] Based on this, the present invention proposes an LNG dual-fuel powered ship gas supply and energy recovery system, optimizes the design of the LNG powered ship gas supply process, innovatively designs an LNG pump pool with a cooling pipe, uses the thermal energy of the engine cylinder jacket water to provide a heat source for the gasifier and heat the BOG, uses liquid nitrogen from the nitrogen storage skid in the filling area to cool the compressed BOG, and the nitrogen after absorbing the compression heat expands to do work and cools, throttles, and reliquefies, thereby improving the system's gas supply efficiency and energy utilization rate, reducing gas supply process losses, and realizing energy recovery and multi-stage utilization, which will have good application prospects. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a comprehensive energy utilization system and design method for LNG-powered ships. This system optimizes the design of the LNG-powered ship's gas supply process, innovatively designs an LNG pump tank with cooling pipes, uses engine jacket water to provide the system's heat source, and uses liquid nitrogen from the nitrogen storage skid in the filling area to provide the system's cooling source. This improves the system's gas supply efficiency and energy utilization, reduces losses in the gas supply process, and achieves energy recovery and multi-stage utilization.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: an LNG dual-fuel powered ship gas supply and energy recovery system, comprising an LNG dual-fuel engine gas supply unit and a BOG gas supply and energy recovery unit, wherein the LNG dual-fuel engine gas supply unit comprises an LNG storage tank, a liquid nitrogen storage tank, a cryogenic pump, a vaporizer, a gas sensor, an expansion water tank, a first liquid pump, a thermal oil heat exchanger, a simmering tank, a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve, a fifth regulating valve, an LNG pump pool, and a GVU unit;

[0006] The outlet of the LNG delivery pipeline of the LNG storage tank is connected in sequence through the first regulating valve, the LNG pump pool, the cryogenic pump, the vaporizer, the gas sensor, the second regulating valve, the simmer tank, and the inlet of the GVU unit. A BOG collection pipeline is provided above the LNG storage tank.

[0007] The cryogenic pump is fixed to the bottom of the inner cavity of the LNG pump pool, and the cryogenic pump body and motor are immersed in the LNG;

[0008] The LNG pump pool adopts a double-layer design, the outer pool is made of high thermal insulation material, the inner pool is made of metal, and the inner layer of the LNG pump pool is wrapped with a high thermal conductivity cooling pipe;

[0009] The vaporizer is provided with a cold fluid inlet, a cold fluid outlet, a hot fluid inlet and a hot fluid outlet, the cold fluid inlet end is connected to the LNG pump pool outlet, the cold fluid outlet end is connected to the gas sensor, the second regulating valve, and the simmering tank, the hot fluid inlet is connected to the cold fluid outlet of the thermal oil heat exchanger, and the hot fluid outlet is connected to the cold fluid inlet of the thermal oil heat exchanger;

[0010] The gas sensor is a sensor capable of detecting gas temperature, pressure and other state parameters, and can control the opening of the regulating valve connected thereto through a control system;

[0011] The liquid nitrogen storage tank is placed on the nitrogen cylinder group skid of the hull, and is provided with two outlets and one inlet. One outlet is connected to the ninth regulating valve and the cooling pipe in sequence, and the other outlet is connected to the cold fluid inlet of the gas-liquid heat exchanger, and the inlet is connected to the second liquid pump and the throttle valve in sequence.

[0012] The expansion water tank has two inlets and two outlets, one outlet is connected in sequence to the fourth regulating valve and the hot fluid inlet of the thermal oil heat exchanger, one inlet is connected in sequence to the first liquid pump, the third regulating valve, and the hot fluid outlet of the thermal oil heat exchanger, another outlet is connected to the hot fluid inlet of the BOG heat exchanger, and the other inlet is connected to the hot fluid outlet of the BOG heat exchanger, and its water source is the engine cylinder jacket water;

[0013] The BOG gas supply and energy recovery unit includes the expansion tank, the BOG compressor, the pressure difference turbine, the BOG heat exchanger, the gas-liquid heat exchanger, the generator, the throttle valve, the second liquid pump, the sixth regulating valve, the seventh regulating valve, the eighth regulating valve, the ninth regulating valve, and the tenth regulating valve;

[0014] The BOG heat exchanger is provided with a cold fluid inlet, a cold fluid outlet, a hot fluid inlet and a hot fluid outlet. The cold fluid inlet is connected to the LNG storage tank BOG collection pipe, the cold fluid outlet is connected to the BOG compressor inlet, the hot fluid inlet is connected to the inlet of one end of the expansion water tank and the fifth regulating valve in sequence, and the hot fluid outlet is connected to the outlet of one end of the expansion water tank;

[0015] The gas-liquid heat exchanger is provided with a cold fluid inlet, a cold fluid outlet, a hot fluid inlet and a hot fluid outlet, the cold fluid inlet is sequentially connected to the liquid nitrogen storage tank and the seventh regulating valve, the cold fluid outlet is connected to the pressure differential turbine inlet, the hot fluid inlet is connected to the BOG compressor outlet, and the hot fluid outlet is sequentially connected to the sixth regulating valve and the simmering tank;

[0016] The pressure differential turbine is also provided with an outlet, which is sequentially connected to the throttle valve, the second liquid pump, and the liquid nitrogen storage tank. The pressure differential turbine is coaxially connected to the generator.

[0017] Preferably, the LNG storage tank is placed on the deck of the power ship and adopts a double-layer insulated C-type tank. The LNG storage tank is equipped with liquid level, pressure and temperature sensors. The LNG transmission pipeline outlet and the BOG collection pipeline outlet are both sealed and connected to the pipeline with flanges.

[0018] Preferably, a plurality of reinforcing ribs are provided at the bottom of the LNG pump pool, a sealing flange and a cooling pipe inlet are provided at the top, an LNG pump pool inlet is provided on one side of the LNG pump pool, and an LNG pump pool outlet is provided on the other side.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The LNG dual-fuel powered ship gas supply and energy recovery system of the present invention optimizes the design of the LNG powered ship gas supply process and innovatively designs the LNG pump pool. It does not require additional cold and heat sources required for the gas supply system, and can output power, thereby improving the system's gas supply efficiency and energy utilization rate, reducing gas supply process losses, and realizing energy recovery and multi-stage utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a gas supply and energy recovery system for an LNG dual-fuel powered ship according to the present invention;

[0022] Figure 2This is a schematic diagram of the structure of the LNG pump pool with cooling pipes;

[0023] Figure 3 Schematic diagram of the dual-circuit process for providing heat energy to the expansion tank;

[0024] Figure 4 This is a schematic diagram of the working process of the gas supply and energy recovery system of an LNG dual-fuel powered ship of the present invention.

[0025] In the figure: 1. LNG storage tank; 2. First regulating valve; 3. Cryogenic pump; 4. LNG pump pool; 5. Vaporizer; 6. Gas sensor; 7. Second regulating valve; 8. Swelling tank; 9. GVU unit; 10. Thermal oil heat exchanger; 11. Sixth regulating valve; 12. First liquid pump; 13. Third regulating valve; 14. Fourth regulating valve; 15. Expansion water tank; 16. Fifth regulating valve; 17. BOG heat exchanger; 18. BOG compressor; 19. Gas-liquid exchanger Heater; 20. Seventh regulating valve; 21. Eighth regulating valve; 22. Liquid nitrogen storage tank; 23. Generator; 24. Pressure differential turbine; 25. Throttle valve; 26. Second liquid pump; 27. Ninth regulating valve; 28. Tenth regulating valve; 401: Inner tank; 402: Cooling pipe; 403: LNG pump tank outlet; 404: Cooling pipe inlet; 405: Sealing flange; 406: Outer tank; 407: LNG pump tank inlet; 408: Reinforcement rib; “→” flow direction. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] like Figure 1-4As shown, the present invention provides an LNG dual-fuel powered ship gas supply and energy recovery system, including an LNG dual-fuel engine gas supply unit and a BOG gas supply and energy recovery unit, the LNG dual-fuel engine gas supply unit includes an LNG storage tank 1, a liquid nitrogen storage tank 22, a cryogenic pump 3, a vaporizer 5, a gas sensor 6, an expansion water tank 15, a first liquid pump 12, a thermal oil heat exchanger 10, a simmering tank 8, a first regulating valve 2, a second regulating valve 7, a third regulating valve 13, a fourth regulating valve 14, a fifth regulating valve 16, an LNG pump pool 4, and a GVU unit 9; the LNG delivery pipeline outlet of the LNG storage tank 1 is connected in sequence through the first regulating valve 2, the LNG pump pool 4, the cryogenic pump 3, the vaporizer 5, the gas sensor 6, the second regulating valve 7, the simmering tank 8, and the inlet of the GVU unit 9, and a BOG collecting pipeline is arranged above the LNG storage tank 1;

[0028] The cryogenic pump 3 is fixed to the bottom of the inner cavity of the LNG pump pool 4. The pump body and motor of the cryogenic pump 3 are immersed in the LNG and are used for pre-cooling and pressurizing the LNG.

[0029] The LNG pump pool 4 adopts a double-layer design, the outer pool 406 is made of high-insulation material, and the inner pool 401 is made of metal. The inner layer of the LNG pump pool 4 is wrapped with a cooling pipe 402 with high thermal conductivity. Liquid nitrogen is passed into the cooling pipe 402 to maintain an extremely low temperature environment below the boiling point of LNG for the LNG pump pool 4. The inner pool 401 is wrapped with a cooling pipe 402 with good thermal conductivity. The circulation loops intersect at the bottom of the inner pool 401. The intersection of the circulation loops is connected by welding. Liquid nitrogen is passed into the cooling pipe 402 to further cool the LNG fuel to be used and prevent LNG backflow;

[0030] The vaporizer 5 is provided with a cold fluid inlet, a cold fluid outlet, a hot fluid inlet and a hot fluid outlet. The cold fluid inlet is connected to the outlet of the LNG pump pool 4, the cold fluid outlet is connected to the gas sensor 6, the second regulating valve 7, and the simmering tank 8, the hot fluid inlet is connected to the thermal oil outlet of the thermal oil heat exchanger 10, and the hot fluid outlet is connected to the thermal oil inlet of the thermal oil heat exchanger 10. The heat source of the vaporizer 5 is provided by the cylinder jacket water from the engine. In order to prevent leakage from accidentally causing LNG to enter the engine, intermediate medium thermal oil is used to transfer to the vaporizer 5. At the same time, the flow rate of the thermal oil is controlled to ensure that no ice occurs in the heat exchanger channel to block the heat exchanger. The thermal oil of the thermal oil heat exchanger 10 is fed to the LNG for heating, so that the LNG enters through the cold fluid inlet of the vaporizer 5 and is vaporized and heated. The LNG is vaporized and heated to about -30°C in the vaporizer 5, meeting the temperature required by the GVU.

[0031] The gas sensor 6 is a sensor capable of detecting gas temperature, pressure and other state parameters, and can control the opening of the subsequent regulating valve through the control system. The gas sensor 6 can detect whether the gasified and heated NG fuel meets the demand and can coordinate with the opening of the subsequent second regulating valve 7 to control the fuel delivery. The swell tank 8 adopts a multi-layer insulation structure and is fixed to the hull with bolts and reinforcement ribs, which can reduce the pressure and temperature fluctuations of the natural gas fuel and improve the stability of the fuel.

[0032] The liquid nitrogen storage tank 22 is placed on the nitrogen cylinder group skid of the hull, and is provided with two outlets and one inlet. One outlet is connected to the ninth regulating valve 27 and the cooling pipe 402 in sequence, and the other outlet is connected to the cold fluid inlet of the gas-liquid heat exchanger 19. The inlet is connected to the second liquid pump 26 and the throttle valve 25 in sequence. It can not only be used to pre-cool the LNG storage tank 1 before filling with LNG, but also use part of the cooling capacity of the liquid nitrogen to cool the LNG in the working area and part to cool the compressed BOG, thereby absorbing the compression heat and reducing energy consumption.

[0033] The expansion water tank 15 has two inlets and two outlets. One outlet is connected in sequence to the fourth regulating valve 14 and the hot fluid inlet of the thermal oil heat exchanger 10. Another inlet is connected in sequence to the first liquid pump 12, the third regulating valve 13, and the hot fluid outlet of the thermal oil heat exchanger 10. Another outlet is connected to the hot fluid inlet of the BOG heat exchanger 17. Another inlet is connected to the hot fluid outlet of the BOG heat exchanger 17. The water source is the engine jacket water, which is stored in the expansion water tank 15.

[0034] The BOG gas supply and energy recovery unit includes the expansion tank 15, the BOG compressor 18, the pressure difference turbine 24, the BOG heat exchanger 17, the gas-liquid heat exchanger 19, the generator 23, the throttle valve 25, the second liquid pump 26, the sixth regulating valve 11, the seventh regulating valve 20, the eighth regulating valve 21, the ninth regulating valve 27, and the tenth regulating valve 28. The BOG compressor 18 is a motor-driven piston compressor for collecting BOG.

[0035] The BOG heat exchanger 17 is equipped with a cold fluid inlet, a cold fluid outlet, a hot fluid inlet, and a hot fluid outlet. The cold fluid inlet is connected to the BOG collection pipeline of the LNG storage tank 1, the cold fluid outlet is connected to the inlet of the BOG compressor 18, the hot fluid inlet is sequentially connected to the inlet of one end of the expansion water tank 15 and the fifth regulating valve 16, and the hot fluid outlet is connected to the outlet of one end of the expansion water tank 15. BOG is transported to the BOG heat exchanger 17 through the collection pipeline and the tenth regulating valve 28. The heat source of the BOG heat exchanger 17 is provided by the engine cylinder jacket water from the expansion water tank 15. The two exchange heat in the BOG heat exchanger 17. After heat exchange, the BOG is heated to the required temperature of the GVU unit 9. The heated BOG enters the BOG compressor 18. The BOG compressor 18 is a fixed oil-free compressor with a bottom reinforced rib fixed to the hull, which can collect and compress the BOG vapor to the required pressure.

[0036] The gas-liquid heat exchanger 19 is provided with a cold fluid inlet, a cold fluid outlet, a hot fluid inlet, and a hot fluid outlet. The cold fluid inlet is connected to the liquid nitrogen storage tank 22 and the seventh regulating valve 20 in sequence, the cold fluid outlet is connected to the inlet of the pressure differential turbine 24, the hot fluid inlet is connected to the outlet of the BOG compressor 18, and the hot fluid outlet is connected to the sixth regulating valve 11 and the swell tank 8 in sequence. Liquid nitrogen and compressed BOG exchange heat here. The cooled BOG reaches the state required by the GVU unit 9 and enters the swell tank 8 through the pipeline and the regulating valve to be supplied to the engine for combustion, completing the BOG gas supply circuit. After the liquid nitrogen absorbs the compression heat of the BOG in the gas-liquid heat exchanger 19, its pressure and temperature rise, and it becomes low-temperature nitrogen. The low-temperature nitrogen enters the pressure differential turbine 24 and expands to perform work.

[0037] The pressure differential turbine 24 is also provided with an outlet, which is sequentially connected to the throttle valve 25, the second liquid pump 26, and the liquid nitrogen storage tank 22. The pressure differential turbine 24 is coaxially connected to the generator 23. The pressure differential turbine 24 generates work to drive the generator 23 to work and output electrical energy. The throttle valve 25 is used to throttle the extremely low-temperature nitrogen from the outlet of the pressure differential turbine 24, liquefies it into liquid nitrogen through the throttle valve 25, and is pumped back to the liquid nitrogen storage tank 22 through the liquid pump, thereby completing the recycling of liquid nitrogen cold energy.

[0038] like Figure 1 As shown, the LNG storage tank 1 is placed on the deck of the power ship and adopts a double-layer insulated C-type tank. The LNG storage tank 1 is equipped with liquid level, pressure and temperature sensors, and the LNG transmission pipeline outlet and the BOG collection pipeline outlet are both sealed with flanges and pipelines; in this embodiment, the LNG storage tank 1 is equipped with liquid level, pressure and temperature sensors, which can cooperate with the control system to realize the LNG storage, reflux, discharge and other functions of the storage tank.

[0039] like Figure 2As shown, a plurality of reinforcing ribs 408 are provided at the bottom of the LNG pump pool 4, a sealing flange 405 and a cooling pipe inlet 404 are provided at the top, an LNG pump pool inlet 407 is provided on one side of the LNG pump pool 4, and an LNG pump pool outlet 403 is provided on the other side; in this embodiment, the reinforcing ribs 408 are used to stabilize the LNG pump pool 4, the cooling pipe inlet 404 is used to connect to the liquid nitrogen storage tank 22, the LNG pump pool inlet 407 is used to connect to the LNG storage tank 1 delivery pipeline outlet, and the LNG pump pool outlet 403 is used to connect to the cold fluid inlet of the vaporizer 5.

[0040] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An LNG dual-fuel powered ship gas supply and energy recovery system, comprising an LNG dual-fuel engine gas supply unit and a BOG gas supply and energy recovery unit, characterized in that: The LNG dual-fuel engine gas supply unit comprises an LNG storage tank (1), a liquid nitrogen storage tank (22), a cryogenic pump (3), a vaporizer (5), a gas sensor (6), an expansion water tank (15), a first liquid pump (12), a thermal oil heat exchanger (10), a simmer tank (8), a first regulating valve (2), a second regulating valve (7), a third regulating valve (13), a fourth regulating valve (14), a fifth regulating valve (16), an LNG pump pool (4), and a GVU unit (9); The outlet of the LNG delivery pipeline of the LNG storage tank (1) is connected in sequence through the first regulating valve (2), the LNG pump pool (4), the cryogenic pump (3), the vaporizer (5), the gas sensor (6), the second regulating valve (7), the simmering tank (8), and the inlet of the GVU unit (9); a BOG collecting pipeline is provided above the LNG storage tank (1); The cryogenic pump (3) is fixed to the bottom of the inner cavity of the LNG pump pool (4), and the pump body and motor of the cryogenic pump (3) are immersed in the LNG; The LNG pump pool (4) adopts a double-layer design, the outer pool (406) is made of high-insulation material, the inner pool (401) is made of metal, and the inner layer of the LNG pump pool (4) is wound with a cooling pipe (402) with high thermal conductivity; The vaporizer (5) is provided with a cold fluid inlet, a cold fluid outlet, a hot fluid inlet and a hot fluid outlet, the cold fluid inlet end is connected to the outlet of the LNG pump pool (4), the cold fluid outlet end is connected to the gas sensor (6), the second regulating valve (7), and the simmering tank (8), the hot fluid inlet is connected to the cold fluid outlet of the thermal oil heat exchanger (10), and the hot fluid outlet is connected to the cold fluid inlet of the thermal oil heat exchanger (10); The gas sensor (6) is a sensor capable of detecting gas temperature and pressure, and can control the opening of a regulating valve connected thereto through a control system; The liquid nitrogen storage tank (22) is placed on the nitrogen cylinder group skid of the hull, and is provided with two outlets and one inlet, one outlet of which is connected in sequence to the ninth regulating valve (27) and the cooling pipe (402), and the other outlet of which is connected to the cold fluid inlet of the gas-liquid heat exchanger (19), and the inlet is connected in sequence to the second liquid pump (26) and the throttle valve (25); The expansion water tank (15) has two inlets and two outlets, one outlet is sequentially connected to the fourth regulating valve (14) and the hot fluid inlet of the thermal oil heat exchanger (10), one inlet is sequentially connected to the first liquid pump (12), the third regulating valve (13), and the hot fluid outlet of the thermal oil heat exchanger (10), another outlet is connected to the hot fluid inlet of the BOG heat exchanger (17), and another inlet is connected to the hot fluid outlet of the BOG heat exchanger (17), and its water source is the engine cylinder jacket water; The BOG gas supply and energy recovery unit comprises the expansion water tank (15), the BOG compressor (18), the pressure differential turbine (24), the BOG heat exchanger (17), the gas-liquid heat exchanger (19), the generator (23), the throttle valve (25), the second liquid pump (26), the sixth regulating valve (11), the seventh regulating valve (20), the eighth regulating valve (21), the ninth regulating valve (27), and the tenth regulating valve (28); The BOG heat exchanger (17) is provided with a cold fluid inlet, a cold fluid outlet, a hot fluid inlet and a hot fluid outlet. The cold fluid inlet is connected to the BOG collecting pipeline of the LNG storage tank (1), the cold fluid outlet is connected to the inlet of the BOG compressor (18), the hot fluid inlet is connected in sequence to the inlet of one end of the expansion water tank (15) and the fifth regulating valve (16), and the hot fluid outlet is connected to the outlet of one end of the expansion water tank (15); The gas-liquid heat exchanger (19) is provided with a cold fluid inlet, a cold fluid outlet, a hot fluid inlet and a hot fluid outlet, the cold fluid inlet is sequentially connected to the liquid nitrogen storage tank (22) and the seventh regulating valve (20), the cold fluid outlet is connected to the inlet of the pressure differential turbine (24), the hot fluid inlet is connected to the outlet of the BOG compressor (18), and the hot fluid outlet is sequentially connected to the sixth regulating valve (11) and the simmering tank (8); The pressure differential turbine (24) is also provided with an outlet, which is sequentially connected to the throttle valve (25), the second liquid pump (26), and the liquid nitrogen storage tank (22). The pressure differential turbine (24) is coaxially connected to the generator (23).

2. The LNG dual-fuel powered ship gas supply and energy recovery system according to claim 1 is characterized in that: The LNG storage tank (1) is placed on the deck of the power ship and adopts a double-layer insulation C-type tank. The LNG storage tank (1) is equipped with liquid level, pressure and temperature sensors. The outlet of the LNG transmission pipeline and the outlet of the BOG collection pipeline are both sealed with flanges.

3. The LNG dual-fuel powered ship gas supply and energy recovery system according to claim 1 is characterized in that: The bottom of the LNG pump pool (4) is provided with a plurality of reinforcing ribs (408), the top is provided with a sealing flange (405) and a cooling pipe inlet (404), one side of the LNG pump pool (4) is provided with an LNG pump pool inlet (407), and the other side is provided with an LNG pump pool outlet (403).

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