A ship fuel supply system

Abstract

The present invention discloses a ship fuel supply system, including a fuel storage tank T, wherein a centrifugal fuel pump P is arranged in the fuel storage tank T, and the centrifugal fuel pump P inputs the LNG in the fuel storage tank T into a cryogenic vacuum pump pool D through an ultra-low temperature pipeline, and a high-pressure fuel pipeline and a low-pressure fuel pipeline are arranged downstream of the cryogenic pump pool D. The cryogenic pump of the present invention belongs to a hydraulic pump, and the hydraulic pump is installed in the pump pool as a whole, and the medium has no leakage, which effectively reduces the system cooling loss, reduces the vaporization amount, helps to optimize the working conditions when the cryogenic pump is running, and effectively prolongs the pressure storage time of the storage tank.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel supply systems for ships, and in particular to a fuel supply system for ships equipped with a high-pressure engine. Background Art

[0002] In the era of economic globalization, shipping has always played a leading role in world trade and transportation, carrying 90% of the cargo volume. At the same time, the air pollution caused by shipping vessels and the large amount of greenhouse gas emissions have seriously polluted the marine environment. In order to deal with this problem, IMO has proposed a series of mandatory measures for ship desulfurization and denitrification to deal with the major issue of ship pollutant emissions in the entire industry. In recent years, IMO has put forward new requirements for carbon oxide emissions in ship exhaust emissions, and achieved the historic goal of reducing the carbon intensity of the global shipping industry by 70% compared with 2008 by 2050.

[0003] In order to solve the emission problems of sulfur oxides and nitrogen oxides, mainstream ship main engine manufacturers such as MAN and Wärtsilä have successively launched LNG dual-fuel engines, which can use not only ship fuel but also liquefied natural gas (LNG) to work. Market research shows that LNG fuel is more economical than marine fuel and has significantly reduced pollutant emissions, and is gaining favor from more and more ship owners.

[0004] Among them, the MAN ME-GI dual-fuel engine is a two-stroke low-speed engine with high-pressure injection. It can burn gas or fuel in any proportion. By igniting natural gas with fuel, it can save 30% of fuel costs and reduce carbon dioxide emissions. The air supply system of the engine is a high-pressure air supply system, and its natural gas inlet pressure is about 300 bar. Summary of the invention

[0005] In view of the problems in the related art, the present invention proposes a ship fuel supply system to overcome the above technical problems existing in the existing related art.

[0006] To this end, the specific technical solution adopted by the present invention is as follows:

[0007] A ship fuel supply system comprises a fuel storage tank T1, wherein the fuel storage tank T1 is provided with a centrifugal fuel pump P1 and a centrifugal fuel pump P2, wherein the centrifugal fuel pump P1 and the centrifugal fuel pump P2 both input LNG in the fuel storage tank T1 into a cryogenic vacuum pump pool D1 through ultra-low temperature pipelines L1, L2 and L3, wherein a high-pressure fuel pipeline and a low-pressure fuel pipeline are provided downstream of the cryogenic pump pool D1, wherein the high-pressure fuel pipeline comprises an immersion hydraulic plunger pump P3 and an immersion hydraulic plunger pump P4. The submerged hydraulic piston pump P3 and the submerged hydraulic piston pump P4 are connected to the high-pressure heat exchanger H1 through the high-pressure LNG pipeline L4A, the high-pressure LNG pipeline L4B and the high-pressure LNG pipeline L5. The high-pressure heat exchanger H1 is connected to the high-pressure buffer tank B1 through the high-pressure LNG pipeline L6, the high-pressure buffer tank B1 is connected to the high-pressure buffer tank B2 through the high-pressure gas regulating valve V1 and the high-pressure LNG pipeline L7, the high-pressure buffer tank B2 is connected to the high-pressure main engine control valve group through the high-pressure gas supply pipeline L8, the low-pressure fuel pipeline includes the LNG pipeline L9, the low-pressure evaporator H2, the low-pressure NG pipeline L10, the low-pressure heater H3, the low-pressure regulating valve V2, the low-pressure The vacuum pump pool D1 is connected to the low-pressure evaporator H2 through the LNG pipeline L9, the low-pressure evaporator H2 is connected to the low-pressure heater H3 through the low-pressure NG pipeline L10, the low-pressure heater H3 is connected to the low-pressure buffer tank B3 through the low-pressure regulating valve V1 and the low-pressure NG pipeline L11, and the low-pressure buffer tank B3 is connected to the low-pressure machine control valve group through the low-pressure gas supply pipeline L12.

[0008] Preferably, the submerged hydraulic piston pump P3 and the submerged hydraulic piston pump P4 can also be installed in two separate vacuum pump pools D2 and vacuum pump pool D3 respectively, and the ultra-low temperature pipeline L1, the ultra-low temperature pipeline L2, and the ultra-low temperature pipeline L3 can also be connected and penetrated with the LNG pipeline L4A and the LNG pipeline L4B, and the LNG pipeline L4A and the LNG pipeline L4B are respectively connected and penetrated with the vacuum pump pool D2 and the vacuum pump pool D3, and a high-pressure fuel pipeline and a low-pressure fuel pipeline are provided downstream of the vacuum pump pool D2 and the vacuum pump pool D3, and the high-pressure fuel pipeline includes the LNG pipeline L4A and the LNG pipeline L4B, and one end of the LNG pipeline L4A and the LNG pipeline L4B are respectively connected to the submerged hydraulic piston pump P3 and the submerged hydraulic piston pump P4, and the other end is connected to the high-pressure evaporator H4 through the high-pressure LNG pipeline L5. The other end of the high-pressure evaporator H4 is connected and connected with the high-pressure heater H5 through the LNG pipeline L13. The high-pressure heater H5 is connected and connected with the high-pressure buffer tank B4 through the high-pressure gas regulating valve V1 and the high-pressure LNG pipeline L7. The high-pressure buffer tank B4 is connected to the high-pressure main engine control valve group through the gas supply pipeline L8. The low-pressure fuel pipeline includes the LNG pipeline L15. The LNG flowing out of the vacuum pump pool D2 and the vacuum pump pool D3 is collected to the LNG pipeline L9 through the LNG pipeline L14A and the LNG pipeline L14B. The LNG pipeline L9 is connected to the low-pressure evaporation heater H6. The low-pressure evaporation heater H6 is connected and connected with the low-pressure buffer tank B3 through the low-pressure regulating valve V2 and the low-pressure NG pipeline L11. The low-pressure buffer tank B3 is connected to the low-pressure machine control valve group through the low-pressure gas supply pipeline L12.

[0009] Preferably, the ship fuel in the fuel storage tank T1 is distributed to pipeline L16A and pipeline L16B ​​via LNG pipeline L3 and then enters the cryogenic vacuum pump pool D2 and the cryogenic vacuum pump pool D3 respectively. The cryogenic vacuum pump pool D2 and the cryogenic vacuum pump pool D3 are respectively provided with a submersible cryogenic centrifugal pump P5 and an immersed hydraulic plunger pump P6. The cryogenic vacuum pump pool D3 is connected to the high-pressure heat exchanger H1 through the high-pressure LNG pipeline L4 and the high-pressure LNG pipeline L5. The cryogenic vacuum pump pool D2 is connected to the low-pressure evaporator H2 through the LNG pipeline L9. The low-pressure evaporator H2 is connected to the low-pressure heater H3 through the low-pressure NG pipeline L10.

[0010] Preferably, the evaporated gas from the fuel in the fuel storage tank T1 may also be discharged into the low-pressure fuel pipeline through the gas-phase NG pipeline L17 and the gas-phase NG pipeline L18.

[0011] Preferably, a temperature sensor TT and a pressure sensor PT are arranged on the high-pressure buffer tank B1, the high-pressure buffer tank B2, the high-pressure buffer tank B4 and the low-pressure buffer tank B3.

[0012] Preferably, a submersible centrifugal pump is built into the bottom of the fuel storage tank T1, with one unit or two or more units independently arranged; an immersion hydraulic plunger pump is installed in a vacuum pump pool, which can independently install one hydraulic plunger pump, or two or more independent hydraulic plunger pumps can be arranged, or one pump pool can install one hydraulic plunger pump and two or more of the configurations can be independently arranged in the system.

[0013] Preferably, the submerged hydraulic piston pump is equipped with a hydraulic power control device, which can be frequency-controlled within the range of 10%-100%. The hydraulic power control device can provide a power source for one or more of the piston pumps. The power system of the submerged hydraulic piston pump can adopt various methods such as pneumatic control and gear control.

[0014] Preferably, the fuel in the fuel storage tank is pumped into the pump pool by a submersible centrifugal pump, and the pressure in the pump pool is maintained within the range of 5-12 bar gauge pressure. The submersible centrifugal pump is installed in the pump pool and connected to the downstream low-pressure fuel pipeline.

[0015] Preferably, the fuel evaporated gas processing pipeline in the fuel pipeline is connected to the gas phase space of the fuel storage tank and is equipped with a reliquefaction device or a combustion device.

[0016] Beneficial effects of the present invention:

[0017] Since oil is generally used as the transmission medium, the hydraulic components have good lubrication conditions, and the working fluid can be transported to any position through pipelines, allowing the hydraulic actuator and the hydraulic pump to maintain a certain distance; hydraulic transmission can easily convert the rotary motion of the prime mover into linear motion; a wide range of stepless speed regulation can be achieved during operation, and frequency conversion regulation can be achieved within the range of 10%-100%; it is easy to achieve load control, speed control and direction control, and can be centrally controlled, remotely controlled and automatically controlled. At the same time, the power system can also adopt pneumatic control, gear transmission and other methods, with small motion inertia and fast response speed; small mass, small footprint, convenient installation, simple sealing method of parts in contact with fuel medium, convenient disassembly and maintenance, and long service life cycle; the cryogenic pump is installed in the pump pool, and there is no leakage of the medium, which effectively reduces the system's cooling loss and vaporization volume, helps to optimize the operating conditions of the cryogenic pump during operation, and effectively prolongs the pressure storage time of the storage tank; the pre-cooling time of the core components of the cryogenic pump is short, meeting the requirements of immediate cooling and immediate use; the drive system is non-explosion-proof design and can be placed according to actual conditions in the safe area, reducing the system cost; the low-temperature submersible centrifugal fuel pump P1 and the low-temperature submersible centrifugal fuel pump P2 are used as one for use and one for backup, to increase the safety redundancy of the system; the submerged hydraulic piston pump P3 and the submerged hydraulic piston pump P4 have the advantages of small footprint, convenient and reliable installation, no medium leakage, long service life, small motion inertia and fast response speed; since the submerged hydraulic piston pump P3 and the submerged hydraulic piston pump P4 are completely submerged in the vacuum pump pool D1, the system cooling loss is effectively reduced, the vaporization amount is reduced, and it is helpful to optimize the working conditions when the cryogenic pump is running. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Schematic diagram of a ship fuel supply system according to an embodiment of the present invention Figure 1 .

[0020] Figure 2 Schematic diagram of a ship fuel supply system according to an embodiment of the present invention Figure 2 .

[0021] Figure 3 Schematic diagram of a ship fuel supply system according to an embodiment of the present invention Figure 3 .

[0022] Figure 4Schematic diagram of a ship fuel supply system according to an embodiment of the present invention Figure 4 .

[0023] In the figure:

[0024] T1, fuel storage tank; L1, ultra-low temperature pipeline; L2, ultra-low temperature pipeline; L3, ultra-low temperature pipeline; L4A, high-pressure LNG pipeline; L4B, high-pressure LNG pipeline; L5, high-pressure LNG pipeline; L6, high-pressure LNG pipeline; 7, high-pressure LNG pipeline; L8, high-pressure gas supply pipeline; L9, LNG pipeline; L10, low-pressure NG pipeline; L11, low-pressure NG pipeline; L12, low-pressure gas supply pipeline; L13, LNG pipeline; L14, high-pressure LNG pipeline; L14A, LNG pipeline; L14B, LNG pipeline; L15A, LNG pipeline; L15B, LNG pipeline; L16A, pipeline; L16 B. Pipeline; L17. Gas-phase NG pipeline; L18. Gas-phase NG pipeline; B1. High-pressure buffer tank; B2. High-pressure buffer tank; B3. Low-pressure buffer tank; B4. High-pressure buffer tank; D1. Cryogenic vacuum pump pool; D2. Cryogenic vacuum pump pool; D3. Cryogenic vacuum pump pool; D4. Cryogenic vacuum pump pool; H1. High-pressure heat exchanger; H2. Low-pressure evaporator; H3. Low-pressure heater; H4. High-pressure evaporator; H5. High-pressure heater; P1. Submersible centrifugal fuel pump; P2. Submersible centrifugal fuel pump; P3. Submersible hydraulic piston pump; P4. Submersible hydraulic piston pump; P5. Submersible centrifugal fuel pump; P6. Submersible hydraulic piston pump;. DETAILED DESCRIPTION

[0025] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0026] According to an embodiment of the present invention, a ship fuel supply system is provided.

[0027] Embodiment 1, as Figure 1As shown in Figure 4, a ship fuel supply system according to an embodiment of the present invention includes a fuel storage tank T1, wherein the fuel storage tank T1 is provided with a submersible centrifugal fuel pump P1 and a submersible centrifugal fuel pump P2, wherein the submersible centrifugal fuel pump P1 and the submersible centrifugal fuel pump P2 both input the LNG in the fuel storage tank T1 into a cryogenic vacuum pump pool D1 through ultra-cold pipelines L1, L2 and L3, wherein a high-pressure fuel pipeline and a low-pressure fuel pipeline are provided downstream of the cryogenic vacuum pump pool D1, wherein the high-pressure fuel pipeline The invention comprises an immersible hydraulic piston pump P3, an immersible hydraulic piston pump P4, a high-pressure LNG pipeline L4A, a high-pressure LNG pipeline L4B, a high-pressure LNG pipeline L5, a high-pressure heat exchanger H1, a high-pressure LNG pipeline L6, a high-pressure buffer tank B1, a high-pressure gas regulating valve V1, a high-pressure LNG pipeline L7, a high-pressure buffer tank B2, and a high-pressure gas supply pipeline L8. The hydraulic piston pump P3 and the immersible hydraulic piston pump P4 are connected to the high-pressure LNG pipeline L4A, the high-pressure LNG pipeline L4B and the high-pressure LNG pipeline L5. 5 is connected to and communicated with the high-pressure heat exchanger H1, the high-pressure heat exchanger H1 is connected to and communicated with the high-pressure buffer tank B1 through the high-pressure LNG pipeline L6, the high-pressure buffer tank B1 is connected to and communicated with the high-pressure buffer tank B2 through the high-pressure gas regulating valve V1 and the high-pressure LNG pipeline L7, the high-pressure buffer tank B2 is connected to the high-pressure main engine control valve group through the high-pressure gas supply pipeline L8, the low-pressure fuel pipeline includes the LNG pipeline L9, the low-pressure evaporator H2, the low-pressure NG pipeline L10, the low-pressure heater H3, the low-pressure regulating valve V1, the low-pressure LNG pipeline L2, the low-pressure evaporator H2, the low-pressure LNG pipeline L3, the low-pressure evaporator H3, the low-pressure evaporator H4, the low-pressure evaporator H5, the low-pressure evaporator H6, the low-pressure LNG pipeline L4, the low-pressure evaporator H7, the low-pressure evaporator H8, the low-pressure evaporator H9, the low-pressure evaporator H10, the low-pressure evaporator H11, the low-pressure evaporator H12, the low-pressure LNG pipeline L5, the low-pressure evaporator H13, the low-pressure evaporator H14, the low-pressure evaporator H15, the low-pressure evaporator H16, the low-pressure evaporator H17, the low-pressure evaporator H18, the low-pressure evaporator H19, the low-pressure evaporator H2 The throttle valve V2, the low-pressure NG pipeline L11, the low-pressure buffer tank B3, and the low-pressure gas supply pipeline L12, the vacuum pump pool D1 is connected to the low-pressure evaporator H2 through the LNG pipeline L9, the low-pressure evaporator H2 is connected to the low-pressure heater H3 through the low-pressure NG pipeline L10, the low-pressure heater H3 is connected to the low-pressure buffer tank B3 through the low-pressure regulating valve V2 and the low-pressure NG pipeline L11, and the low-pressure buffer tank B3 is connected to the low-pressure machine control valve group through the low-pressure gas supply pipeline L12.

[0028] In the second embodiment, the submerged hydraulic piston pump P3 and the submerged hydraulic piston pump P4 can also be installed in two separate low-temperature vacuum pump pools D2 and low-temperature vacuum pump pools D3, and the ultra-low temperature pipelines L1, L2 and L3 can also be connected and penetrated with the LNG pipeline L15A and the LNG pipeline L15B. The LNG pipeline L15A and the LNG pipeline L15B are respectively connected and penetrated with the vacuum pump pool D2 and the vacuum pump pool D3. A high-pressure fuel pipeline and a low-pressure fuel pipeline are provided downstream of the vacuum pump pool D2 and the vacuum pump pool D3. The high-pressure fuel pipeline includes an LNG pipeline L14A and an LNG pipeline L14B. One end of the LNG pipeline L14A and the LNG pipeline L14B are respectively connected to the submerged hydraulic piston pump P3 and the submerged hydraulic piston pump P4, and the other end is connected to the submerged hydraulic piston pump P3 and the submerged hydraulic piston pump P4 through the high-pressure LNG pipeline L5. It is connected and communicated with the high-pressure evaporator H4, and the other end of the high-pressure evaporator H4 is connected and communicated with the high-pressure heater H5 through the LNG pipeline L3. The high-pressure heater H5 is connected and communicated with the high-pressure LNG pipeline L7 and the high-pressure buffer tank B4 through the high-pressure gas regulating valve V1. The high-pressure buffer tank B4 is connected to the high-pressure main engine control valve group through the gas supply pipeline L8. The low-pressure fuel pipeline includes the LNG pipeline L9. The LNG flowing out of the vacuum pump pool D2 and the vacuum pump pool D3 is collected to the LNG pipeline L9 through the LNG pipeline L14A and the LNG pipeline L14B. The LNG pipeline L9 is connected to the low-pressure evaporator H6. The low-pressure evaporator H6 is connected and communicated with the low-pressure buffer tank B3 through the low-pressure regulating valve V2 and the low-pressure NG pipeline L11. The low-pressure buffer tank B3 is connected to the low-pressure machine control valve group through the low-pressure gas supply pipeline L12. It is not difficult to see from the above design that the design of the anti-slip texture is relatively conventional, so no detailed description is given.

[0029] In the third embodiment, the ship fuel in the fuel storage tank T1 is distributed to the pipeline L16A and the pipeline L16B ​​via the LNG pipeline L3 and then enters the cryogenic vacuum pump pool D2 and the cryogenic vacuum pump pool D3 respectively. The cryogenic vacuum pump pool D3 and the cryogenic vacuum pump pool D3 are respectively provided with a submersible cryogenic centrifugal pump P5 and an immersed hydraulic plunger pump P6. The cryogenic vacuum pump pool D3 is connected to the high-pressure heat exchanger H1 through the high-pressure LNG pipeline L4 and the high-pressure LNG pipeline L5. The cryogenic vacuum pump pool D2 is connected to the low-pressure evaporator H2 through the LNG pipeline L9. The low-pressure evaporator H2 is connected to the low-pressure heater H3 through the low-pressure NG pipeline L10.

[0030] In the fourth embodiment, the gas evaporated from the fuel in the fuel storage tank T1 can also be discharged into the low-pressure fuel pipeline through the gas phase NG pipeline L17 and the gas phase NG pipeline L18. The high-pressure buffer tank B1, the high-pressure buffer tank B2, the high-pressure buffer tank B3, and the high-pressure buffer tank B4 are all provided with a temperature sensor TT and a pressure sensor PT. A submersible centrifugal pump is built into the bottom of the fuel storage tank T1, and one unit is arranged or two or more units are arranged independently. An immersion hydraulic plunger pump is installed in a vacuum pump pool, and the pump pool can be independently equipped with a hydraulic plunger pump, or two or more independent hydraulic plunger pumps can be arranged, or one pump pool can be equipped with one hydraulic plunger pump. Two or more of the configurations are independently arranged in the system. The submerged hydraulic plunger pump is equipped with a set of hydraulic power control devices, which can be frequency-controlled within the range of 10%-100%. The hydraulic power control device can provide a power source for one or more of the plunger pumps. The power system of the submerged hydraulic plunger pump can adopt various methods such as pneumatic control and gear control. The fuel in the fuel storage tank is pumped into the pump pool by the submersible centrifugal pump. The pressure in the pump pool is maintained within the range of 5-12 bar gauge pressure. The submersible centrifugal pump is installed in the pump pool and connected to the downstream low-pressure fuel pipeline. The fuel vapor processing pipeline in the fuel pipeline is connected to the gas phase space of the fuel storage tank, and a reliquefaction device or a combustion device is configured. It is not difficult to see from the above design that the low-temperature submersible centrifugal fuel pump P1 and the low-temperature submersible centrifugal fuel pump P2 are used in one for use and the other for backup, which is used to increase the safety redundancy of the system.

[0031] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation mode of the present invention in the actual process is described in detail below.

[0032] In summary, with the help of the above technical solution of the present invention, since oil is generally used as the transmission medium, the hydraulic components have good lubrication conditions, the working fluid can be transported to any position by pipeline, and the hydraulic actuator and the hydraulic pump are allowed to maintain a certain distance; the hydraulic transmission can easily convert the rotary motion of the prime mover into linear motion; a wide range of stepless speed regulation can be achieved during operation, and variable frequency regulation can be achieved within the range of 10%-100%; it is easy to achieve load control, speed control and direction control, and can be centrally controlled, remotely controlled and automatically controlled. At the same time, the power system can also adopt various methods such as pneumatic control and gear transmission; the movement inertia is small and the response speed is fast; the mass is small, the footprint is small, the installation form is convenient, the sealing method of the parts in contact with the fuel medium is simple, the disassembly and maintenance are convenient, and the service life cycle is long; the cryogenic pump is installed in the pump pool, and the medium has no leakage, which effectively reduces the system cooling loss and the vaporization amount, which is helpful for the optimization of the working conditions when the cryogenic pump is running, and effectively prolongs the pressure storage time of the storage tank; the pre-cooling time of the core components of the cryogenic pump is short, which meets the working condition requirements of immediate cooling and immediate use; the drive system is non-explosion-proof design, and can be placed according to actual conditions in the safe area, reducing the system cost; the low-temperature submersible centrifugal fuel pump P1 and the low-temperature submersible centrifugal fuel pump P2 are used as one for use and one for backup, to increase the safety redundancy of the system; the submerged hydraulic piston pump P3 and the submerged hydraulic piston pump P4 have the advantages of small footprint, convenient and reliable installation, no medium leakage, long service life, small motion inertia and fast response speed; since the submerged hydraulic piston pump P3 and the submerged hydraulic piston pump P4 are completely submerged in the vacuum pump pool D1, the system cooling loss is effectively reduced, the vaporization amount is reduced, and it is helpful to optimize the working conditions when the cryogenic pump is running.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A ship fuel supply system, characterized in that: The invention comprises a fuel storage tank (T1), wherein the fuel storage tank (T1) is provided with a submersible centrifugal fuel pump 1 (P1) and a submersible centrifugal fuel pump 2 (P2), wherein the submersible centrifugal fuel pump 1 (P1) and the submersible centrifugal fuel pump 2 (P2) input LNG in the fuel storage tank (T1) into a cryogenic vacuum pump pool (D1) through an ultra-low temperature pipeline 1 (L1), an ultra-low temperature pipeline 2 (L2), and an ultra-low temperature pipeline 3 (L3), wherein a high-pressure fuel pipeline and a low-pressure fuel pipeline are provided downstream of the cryogenic vacuum pump pool (D1), wherein the high-pressure fuel pipeline comprises an immersible hydraulic plunger pump 1 (P3), an immersible hydraulic plunger pump 2 (P4 ), high-pressure LNG pipeline one (L4A), high-pressure LNG pipeline two (L4B), high-pressure LNG pipeline three (L5), high-pressure heat exchanger (H1), high-pressure LNG pipeline four (L6), high-pressure buffer tank one (B1), high-pressure gas regulating valve (V1), high-pressure LNG pipeline five (L7), high-pressure buffer tank two (B2), high-pressure gas supply pipeline (L8), the submerged hydraulic piston pump one (P3) and the submerged hydraulic piston pump two (P4) are connected to the high-pressure heat exchanger (H1) through the high-pressure LNG pipeline one (L4A), the high-pressure LNG pipeline two (L4B) and the high-pressure LNG pipeline three (L5). 1) connected and connected, the high-pressure heat exchanger (H1) is connected and connected with the high-pressure buffer tank 1 (B1) through the high-pressure LNG pipeline 4 (L6), the high-pressure buffer tank 1 (B1) is connected and connected with the high-pressure buffer tank 2 (B2) through the high-pressure gas regulating valve (V1) and the high-pressure LNG pipeline 5 (L7), the high-pressure buffer tank 2 (B2) is connected with the high-pressure main engine control valve group through the high-pressure gas supply pipeline (L8), the low-pressure fuel pipeline includes the LNG pipeline 1 (L9), the low-pressure evaporator 1 (H2), the low-pressure NG pipeline 1 (L10), the low-pressure heater (H3), the low-pressure regulating valve (V2), the low-pressure NG pipeline 2 (L11), low-pressure buffer tank 3 (B3), low-pressure gas supply pipeline (L12), the low-temperature vacuum pump pool (D1) is connected to the low-pressure evaporator 1 (H2) through the LNG pipeline 1 (L9), the low-pressure evaporator 1 (H2) is connected to the low-pressure heater (H3) through the low-pressure NG pipeline 1 (L10), the low-pressure heater (H3) is connected to the low-pressure regulating valve (V2) and the low-pressure NG pipeline 2 (L11) through the low-pressure buffer tank 3 (B3), and the low-pressure buffer tank 3 (B3) is connected to the low-pressure machine control valve group through the low-pressure gas supply pipeline (L12).

2. A ship fuel supply system according to claim 1, characterized in that: The submerged hydraulic piston pump 1 (P3) and the submerged hydraulic piston pump 2 (P4) are respectively installed in two separate vacuum pump pools 1 (D2) and 2 (D3). The ultra-low temperature pipeline 1 (L1), the ultra-low temperature pipeline 2 (L2) and the ultra-low temperature pipeline 3 (L3) can also be connected to the LNG pipeline 5 (L15A) and the LNG pipeline 6 (L15B). The LNG pipeline 5 (L15A) and the LNG pipeline 6 (L15B) are respectively connected to the vacuum pump pool 1 (D2) and the vacuum pump pool 2 (D3). The vacuum pump pool 1 (D2) and the vacuum pump pool 2 (D3) are connected and connected, and a high-pressure fuel pipeline and a low-pressure fuel pipeline are provided downstream of the vacuum pump pool 1 (D2) and the vacuum pump pool 2 (D3). The high-pressure fuel pipeline includes an LNG pipeline 3 (L14A) and an LNG pipeline 4 (L14B). One end of the LNG pipeline 3 (L14A) and the LNG pipeline 4 (L14B) are respectively connected to the submerged hydraulic plunger pump 1 (P3) and the submerged hydraulic plunger pump 2 (P4), and the other end is connected to the high-pressure LNG pipeline 3 (L5). The high-pressure evaporator (H4) is connected and connected, and the other end of the high-pressure evaporator (H4) is connected and connected with the high-pressure heater (H5) through the LNG pipeline 2 (L13). The high-pressure heater (H5) is connected and connected with the high-pressure buffer tank 4 (B4) through the high-pressure gas regulating valve (V1) and the high-pressure LNG pipeline 5 (L7). The high-pressure buffer tank 4 (B4) is connected to the high-pressure main engine control valve group through the high-pressure gas supply pipeline (L8). The low-pressure fuel pipeline includes the LNG pipeline 1 (L9), and the vacuum pump tank 1 (D2) is connected to the vacuum pump tank 1 (D1). The LNG flowing out of the empty pump pool 2 (D3) is collected into the LNG pipeline 1 (L9) through the LNG pipeline 3 (L14A) and the LNG pipeline 4 (L14B). The LNG pipeline 1 (L9) is connected to the low-pressure evaporator 2 (H6). The low-pressure evaporator 2 (H6) is connected to the low-pressure buffer tank 3 (B3) through the low-pressure regulating valve (V2) and the low-pressure NG pipeline 2 (L11). The low-pressure buffer tank 3 (B3) is connected to the low-pressure machine control valve group through the low-pressure gas supply pipeline (L12).

3. A ship fuel supply system according to claim 2, characterized in that: The ship fuel in the fuel storage tank (T1) is distributed to pipeline one (L16A) and pipeline two (L16B) via the ultra-low temperature pipeline three (L3) and then enters the vacuum pump pool one (D2) and the vacuum pump pool two (D3) respectively. The vacuum pump pool one (D2) and the vacuum pump pool two (D3) are respectively provided with a submersible low-temperature centrifugal pump (P5) and an immersed hydraulic plunger pump three (P6). The vacuum pump pool two (D3) is connected to the high-pressure heat exchanger (H1) through a high-pressure LNG pipeline (L4) and the high-pressure LNG pipeline three (L5). The vacuum pump pool one (D2) is connected to the low-pressure evaporator one (H2) through the LNG pipeline one (L9).

4. A ship fuel supply system according to claim 1, characterized in that: The gas evaporated from the fuel in the fuel storage tank (T1) can also enter the low-pressure fuel pipeline through the gas-phase NG pipeline 1 (L17) and the gas-phase NG pipeline 2 (L18).

5. A ship fuel supply system according to claim 3, characterized in that: The high-pressure buffer tank 1 (B1), the high-pressure buffer tank 2 (B2), the low-pressure buffer tank 3 (B3), and the high-pressure buffer tank 4 (B4) are all provided with a temperature sensor (TT) and a pressure sensor (PT).

6. A ship fuel supply system according to claim 5, characterized in that: The submersible centrifugal fuel pump 1 (P1) and the submersible centrifugal fuel pump 2 (P2) are built into the bottom of the fuel storage tank (T1), and one unit is arranged or two or more units are arranged independently; the submersible hydraulic piston pump 1 (P3), the submersible hydraulic piston pump 2 (P4), the submersible hydraulic piston pump 3 (P6) and the submersible cryogenic centrifugal pump (P5) are installed in the cryogenic vacuum pump pool (D1), the vacuum pump pool 1 (D2), the vacuum pump pool 2 (D3) and the vacuum pump pool 3 (D4). One or two of the submersible hydraulic piston pump 1 (P3), the submersible hydraulic piston pump 2 (P4), the submersible cryogenic centrifugal pump (P5) and the submersible hydraulic piston pump 3 (P6) can be independently installed in the cryogenic vacuum pump pool (D1), the vacuum pump pool 1 (D2), the vacuum pump pool 2 (D3) and the vacuum pump pool 3 (D4).

7. A ship fuel supply system according to claim 6, characterized in that: The frequency conversion adjustment range of the submerged hydraulic piston pump 1 (P3), the submerged hydraulic piston pump 2 (P4), and the submerged hydraulic piston pump 3 (P6) is 10%-100%, and the power systems of the three adopt pneumatic control or gear control.

8. A ship fuel supply system according to claim 7, characterized in that: The pressure in the fuel storage tank (T1) is maintained within a gauge pressure range of 5-12 bar, and the submersible cryogenic centrifugal pump (P5) is connected to the low-pressure fuel pipeline downstream.

9. A ship fuel supply system according to claim 8, characterized in that: A fuel boil-off gas processing pipeline is provided in the fuel pipeline, the fuel boil-off gas processing pipeline is connected to the gas phase space of the fuel storage tank (T1), and is equipped with a reliquefaction device or a combustion device.

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