Marine fuel supply system and ammonia BOG recovery and reuse system and method thereof

Abstract

The present invention provides a marine fuel supply system and its ammonia BOG recovery and reuse system and method. The ammonia BOG recovery and reuse system includes a buffer tank, a BOG compressor, a BOG condenser, a gas-liquid separator, and a controller, all connected in sequence. The buffer tank is connected to the ammonia fuel tank and is used to store the ammonia BOG produced in the ammonia fuel tank. The BOG compressor is used to pressurize the ammonia BOG. The BOG condenser is used to perform heat exchange on the pressurized ammonia BOG to produce liquid ammonia containing ammonia BOG that meets the temperature requirements of the ammonia engine. The gas-liquid separator is used to separate the liquid ammonia containing ammonia BOG into gas and liquid, completing the conversion of the ammonia BOG and realizing the recovery and reuse of the ammonia BOG. This system effectively processes and reuses the ammonia BOG in the ammonia fuel tank, reduces the risk of structural rupture in the ship's cabin, increases fuel utilization, and reduces the hazards caused by direct ammonia emissions into the atmosphere.

Description

Technical Field

[0001] The present invention relates to ammonia fuel BOG recovery and reuse technology in the technical field of ship fuel supply systems, and specifically to a ship fuel supply system and an ammonia BOG recovery and reuse system and method thereof, which can be applied to ship ammonia fuel tanks using liquid ammonia as fuel. Background Art

[0002] With the international community's continued concern about greenhouse gas emissions, the International Maritime Organization (IMO) has set decarbonization targets for the shipping industry: using 2018 as a baseline, global maritime CO2 emissions are expected to decrease by 40% by 2030, 70% by 2050, and reach zero emissions by the end of the century. New technologies are being developed for the shipping industry, using clean energy ammonia as a marine fuel. Typically, ammonia fuel tanks on ships are insulated. While insulation can largely block heat conduction, over time, the liquid ammonia stored in the tanks will evaporate. The resulting boil-off gas (BOG) accumulates at the top of the tank, causing pressure to build up. If the accumulated BOG is not promptly addressed, the safety valve at the top of the tank will trip, potentially rupturing the tank structure.

[0003] Ammonia is a colorless gas with a strong, pungent odor. Its density is lower than that of air, but it is highly soluble in water. Excessive inhalation poses a threat to human life. Currently, marine ammonia fuel is stored in a liquid state at -33°C in ammonia fuel tanks, where it evaporates and produces ammonia. Existing marine ammonia fuel supply systems lack ammonia recovery and treatment technology, resulting in safety hazards in ammonia fuel tanks due to the generation of ammonia BOG (ammonia buildup), and the volatilization of ammonia also poses a risk to the environment. Currently, no descriptions or reports of technologies similar to the present invention have been found, nor has any similar information been collected domestically or internationally. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a marine fuel supply system and an ammonia BOG recovery and reuse system and method thereof, which can safely and reliably recover and reuse ammonia fuel BOG.

[0005] According to one aspect of the present invention, an ammonia BOG recovery and reuse system for a marine fuel supply system is provided, comprising a buffer tank, a BOG compressor, a BOG condenser, a gas-liquid separation tank, and a control valve connected in sequence; wherein:

[0006] The buffer tank is connected to the ammonia fuel tank and is used to store the ammonia BOG generated by the ammonia fuel tank;

[0007] The BOG compressor is used to pressurize the ammonia BOG;

[0008] The BOG condenser is used to perform heat exchange treatment on the pressurized ammonia BOG to obtain liquid ammonia containing ammonia BOG that meets the temperature requirements of the ammonia engine;

[0009] The gas-liquid separation tank is used to separate the liquid ammonia containing ammonia BOG into gas and liquid, and to liquefy the ammonia BOG in the gas phase space in the tank again to complete the conversion of ammonia BOG;

[0010] The control valve is used to control the liquid level of the liquid ammonia in the gas-liquid separation tank and to transport the recovered liquid ammonia to the supply system for reuse.

[0011] Optionally, a pressure sensor is provided in the ammonia fuel tank for monitoring the pressure in the ammonia fuel tank; and the BOG compressor is started when the pressure in the ammonia fuel tank reaches a set value.

[0012] Optionally, the outlet pressure of the BOG compressor is 18-25 bar.

[0013] Optionally, the BOG condenser uses seawater or refrigerant to perform heat exchange treatment on the pressurized ammonia BOG.

[0014] Optionally, the outlet temperature of the BOG condenser is 25-45°C.

[0015] Optionally, the gas-liquid separation tank liquefies the ammonia BOG in the gas phase space in the tank again, including:

[0016] By pressurizing the ammonia BOG at the top of the tank, the ammonia BOG in the gas phase space of the tank is pressurized and liquefied, completing the second liquefaction. Optionally, the ammonia BOG at the top of the tank is pressurized so that the pressure in the gas-liquid separation tank is controlled to be approximately 27 bar.

[0017] According to another aspect of the present invention, a method for recovering and reusing ammonia BOG for a marine fuel supply system is provided, comprising:

[0018] Obtain ammonia BOG generated by ammonia fuel tanks;

[0019] performing a pressurization treatment on the ammonia BOG;

[0020] performing heat exchange treatment on the pressurized ammonia BOG to obtain liquid ammonia containing ammonia BOG that meets the temperature requirements of the ammonia engine;

[0021] The liquid ammonia containing ammonia BOG is subjected to gas-liquid separation to complete the conversion of the ammonia BOG and realize the recovery and reuse of the ammonia BOG.

[0022] According to a third aspect of the present invention, a marine fuel supply system is provided, comprising: the ammonia BOG recovery and reuse system and the ammonia fuel supply system according to any one of claims 1 to 7; wherein:

[0023] The ammonia BOG recovery and reuse system is arranged between the ammonia fuel tank and the ammonia fuel supply system, and is used to compress and liquefy the ammonia BOG generated in the ammonia fuel tank, and convert the ammonia BOG into liquid ammonia that meets the temperature requirements of the ammonia engine;

[0024] The ammonia fuel supply system is arranged between the ammonia fuel tank and the ammonia engine and is connected to the ammonia BOG recovery and reuse system. It is used to mix the liquid ammonia output from the ammonia fuel tank with the liquid ammonia converted by the ammonia BOG recovery and reuse system, and then perform a pressurized filtration process, and finally output ammonia fuel that meets the pressure and temperature requirements of the ammonia engine to the ammonia engine.

[0025] Optionally, the ammonia fuel supply system comprises: a low-pressure pump, a heat exchanger, a high-pressure pump and a filter arranged in sequence from the ammonia fuel tank to the ammonia engine; wherein:

[0026] The low-pressure pump is used to pressurize the liquid ammonia in the ammonia fuel tank to generate low-pressure liquid ammonia;

[0027] The heat exchanger is used to heat or cool the low-pressure liquid ammonia and output fuel that meets the temperature requirements of the ammonia engine;

[0028] The high-pressure pump is used to further pressurize the mixture of the fuel output from the heat exchanger and the liquid ammonia converted by the ammonia BOG recovery and reuse system, and output fuel that meets the pressure requirements of the ammonia engine;

[0029] The filter is used to filter the fuel output by the high-pressure pump, and finally output ammonia fuel that meets the pressure and temperature requirements of the ammonia engine.

[0030] Optionally, the ammonia fuel supply system further includes any one or more of the following components:

[0031] - A main valve and / or FVT valve group unit disposed between the filter and the ammonia engine; wherein the main valve is used for emergency shutoff of the ammonia fuel engine; the FVT valve group unit is used for regulating the flow and pressure of the engine inlet and for purging before and after engine startup;

[0032] - A reflux cooler disposed between the FVT valve block unit and the heat exchanger; wherein the reflux cooler is used to fully exchange heat between the liquid ammonia refluxed from the engine and the cooled cold source, so that the temperature of the cooled liquid ammonia is consistent with the outlet temperature of the heat exchanger.

[0033] Due to the adoption of the above technical solution, the present invention has at least one of the following beneficial effects compared with the prior art:

[0034] The marine fuel supply system and ammonia BOG recovery and reuse system and method provided by the present invention effectively process the ammonia BOG in the ammonia fuel tank and reduce the risk of rupture of the ship's cabin structure.

[0035] The marine fuel supply system and its ammonia BOG recovery and reuse system and method provided by the present invention recover and liquefy the ammonia BOG in the fuel tank and transport it to the ammonia fuel engine for combustion, thereby increasing fuel utilization and reducing the harm caused by direct emission of ammonia into the atmosphere.

[0036] The marine fuel supply system and its ammonia BOG recovery and reuse system and method provided by the present invention reduce the pressure in the fuel tank by recovering the ammonia BOG gas in the fuel tank, thereby ensuring the safety of the fuel tank structure and personnel on board.

[0037] The marine fuel supply system and ammonia BOG recovery and reuse system and method provided by the present invention have simple equipment and method, and have the advantages of stability and reliability, cost reduction, and saving of ship heat energy consumption. They are suitable for power ships using ammonia as fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0039] Figure 1 The figure is a schematic diagram of the composition structure of a marine fuel supply system and an ammonia BOG recovery and reuse system thereof in a preferred embodiment of the present invention.

[0040] In the figure: 1 is the ammonia fuel tank, 2 is the low-pressure pump, 3 is the heat exchanger, 4 is the high-pressure pump, 5 is the filter device, 6 is the main valve, 7 is the FVT valve group unit, 8 is the ammonia fuel engine, 9 is the reflux cooler, 10 is the buffer tank, 11 is the BOG compressor, 12 is the BOG condenser, 13 is the gas-liquid separation tank, 14 is the control valve, and 15 is the pressure sensor of the fuel tank. DETAILED DESCRIPTION

[0041] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process. It should be noted that those skilled in the art may make various modifications and improvements without departing from the scope of the present invention, and these modifications and improvements fall within the scope of protection of the present invention.

[0042] An embodiment of the present invention provides an ammonia BOG recovery and reuse system for a marine fuel supply system. The system collects and compresses ammonia BOG in an ammonia fuel tank, converts it into liquid ammonia through reliquefaction technology, and then pumps it to a high-pressure pump for pressurization. The ammonia is then directly supplied as ammonia fuel to an ammonia fuel engine for combustion, thereby improving the utilization rate of the ammonia fuel.

[0043] like Figure 1 As shown, the ammonia BOG recovery and reuse system for a marine fuel supply system provided in this embodiment may include a buffer tank 10, a BOG compressor 11, a BOG condenser 12, a gas-liquid separation tank 13 and a controller 14 connected in sequence; wherein:

[0044] The buffer tank 10 is connected to the ammonia fuel tank 1 and is used to store the ammonia BOG generated by the ammonia fuel tank 1;

[0045] The BOG compressor 11 is used to pressurize the ammonia BOG;

[0046] The BOG condenser 12 is used to perform heat exchange treatment on the pressurized ammonia BOG to obtain liquid ammonia containing ammonia BOG that meets the temperature requirements of the ammonia engine;

[0047] The gas-liquid separation tank 13 is used to separate the liquid ammonia containing ammonia BOG from gas and liquid, and to liquefy the ammonia BOG in the gas phase space in the tank again, thereby completing the conversion of the ammonia BOG and realizing the recycling and reuse of the ammonia BOG.

[0048] The control valve 14 is used to control the liquid level of the liquid ammonia in the gas-liquid separation tank 13 and to transport the recovered liquid ammonia to the supply system for reuse.

[0049] In a preferred embodiment, a pressure sensor 15 is provided in the ammonia fuel tank 1 for monitoring the pressure in the ammonia fuel tank 1 ; the BOG compressor 11 is started when the pressure in the ammonia fuel tank 1 reaches a set value.

[0050] In a preferred embodiment, the outlet pressure of the BOG compressor 11 is 18-25 bar.

[0051] In a preferred embodiment, the BOG condenser 12 uses seawater or refrigerant to perform heat exchange treatment on the pressurized ammonia BOG.

[0052] In a preferred embodiment, the outlet temperature of the BOG condenser 12 is 25-45°C.

[0053] In a preferred embodiment, the gas-liquid separation tank 13 liquefies the BOG gas in the gas phase space in the tank again, including:

[0054] By pressurizing the ammonia BOG at the top of the tank, the ammonia BOG in the gas phase space in the tank is pressurized and liquefied, completing the second liquefaction.

[0055] In a preferred embodiment, the ammonia BOG at the top of the tank is pressurized so that the pressure in the gas-liquid separation tank 13 is controlled to be about 27 bar. One embodiment of the present invention provides an ammonia BOG recovery and reuse method for a marine fuel supply system, which may include:

[0056] S1, obtaining ammonia BOG generated by ammonia fuel tank 1;

[0057] S2, pressurizing ammonia BOG;

[0058] S3, performing heat exchange treatment on the pressurized ammonia BOG to obtain liquid ammonia containing ammonia BOG that meets the temperature requirements of the ammonia engine;

[0059] S4, performing gas-liquid separation on the liquid ammonia containing ammonia BOG, completing the conversion of the ammonia BOG, and realizing the recovery and reuse of the ammonia BOG.

[0060] It should be noted that the steps in the method provided by the present invention can be implemented using corresponding devices in the system, and those skilled in the art can refer to the technical solution of the system to implement the step flow of the method, that is, the embodiments in the system can be understood as preferred examples of implementing the method, which will not be elaborated here.

[0061] like Figure 1 As shown, the ammonia BOG recovery and reuse system for a marine fuel supply system provided in this embodiment may include: a buffer tank 10 , a BOG compressor 11 , a BOG condenser 12 , a gas-liquid separation tank 13 , and a control valve 14 .

[0062] Liquid ammonia, used as fuel, is stored in an ammonia fuel tank 1 at normal pressure and low temperature. When the pressure in the tank is too high, the ammonia BOG is output and stored in a buffer tank 10. The BOG compressor 11 starts to operate, compressing the ammonia BOG. The ammonia BOG then enters the BOG condenser 12 for cooling and is converted into liquid ammonia. When the temperature reaches the main engine's feed requirement, the ammonia enters the gas-liquid separator 13 for separation. Finally, the liquid ammonia is transported to the high-pressure pump 4 in the ammonia fuel supply, participating in the entire ammonia fuel supply cycle.

[0063] The technical solutions provided by the above embodiments of the present invention are further described below.

[0064] The ammonia BOG recovery and reuse system provided in the above embodiment of the present invention has the following specific implementation scheme:

[0065] During the storage or supply process of ammonia fuel, ammonia (BOG) volatilized from the ammonia fuel tank 1 will continuously accumulate at the top of the tank, causing the pressure inside the tank to increase. When the pressure sensor 15 inside the ammonia fuel tank 1 reaches the set value, the BOG compressor 11 starts to compress the ammonia BOG gas inside the tank. After multi-stage compression by the BOG compressor 11, the ammonia BOG gas reaches a pressure of 18 to 25 bar, consistent with the pressure of the low-pressure pump 2. The ammonia BOG gas then enters the BOG condenser 12 for heat exchange with seawater, converting it into liquid ammonia. The outlet temperature meets the main engine's inlet requirement of 25 to 45°C. The ammonia then enters the gas-liquid separator 13 for liquid separation. When the liquid level in the gas-liquid separator 13 reaches the set value, the control valve 14 opens, and the liquid ammonia stored in the lower part of the gas-liquid separator is transported to the high-pressure pump 4 in the ammonia fuel supply for pressurization. Ultimately, the liquid ammonia that meets the design pressure and design temperature is delivered to the engine 8 for combustion.

[0066] In some embodiments of the present invention, the design pressure of BOG compressor 11 matches that of low-pressure pump 2 and can be activated using both automatic and manual control. The BOG in the ammonia fuel tank is compressed and reliquefied before being transported to the ammonia fuel supply for use, fundamentally improving fuel utilization.

[0067] In some embodiments of the present invention, the BOG condenser 12 uses seawater, commonly used on ships, for heat exchange. A temperature sensor at the condenser outlet regulates the flow rate of the seawater inlet and outlet to ensure that the cooled seawater meets the main engine's required temperature. Seawater is the most commonly used heat exchange medium on ships, saving energy on board.

[0068] In some embodiments of the present invention, a pressure of 27 bar is applied to the gas phase space of the gas-liquid separation tank 13 to liquefy the BOG gas in the gas phase space of the tank again, thereby reducing the harm of ammonia emission into the atmosphere and reducing environmental pollution.

[0069] Since the main engine's required pressure is 85 bar, if the liquefied ammonia is directly delivered to the main engine for combustion, the compressor needs to pressurize it to 85 bar. In some embodiments of the present invention, the liquid ammonia in the gas-liquid separator 13 is delivered to the high-pressure pump for circulation, and only needs to be pressurized to 27 bar. This high-pressure pump-assisted pressure boosting technology can reduce the design pressure of the BOG compressor and save the cost of using a high-pressure BOG compressor.

[0070] One embodiment of the present invention provides a marine fuel supply system.

[0071] like Figure 1 As shown, the marine fuel supply system provided in this embodiment may include: the ammonia BOG recovery and reuse system and the ammonia fuel supply system provided in any of the above embodiments of the present invention; wherein:

[0072] The ammonia BOG recovery and reuse system is arranged between the ammonia fuel tank 1 and the ammonia fuel supply system, and is used to compress and liquefy the ammonia BOG generated in the ammonia fuel tank 1, and convert the ammonia BOG into liquid ammonia that meets the temperature requirements of the ammonia engine;

[0073] The ammonia fuel supply system is arranged between the ammonia fuel tank 1 and the ammonia engine 8, and is connected to the ammonia BOG recovery and reuse system. It is used to mix the liquid ammonia output from the ammonia fuel tank 1 with the liquid ammonia converted by the ammonia BOG recovery and reuse system, and then perform pressurization and filtration treatment, and finally output ammonia fuel that meets the pressure and temperature requirements of the ammonia engine to the ammonia engine 8.

[0074] In a preferred embodiment, the ammonia fuel supply system includes: a low-pressure pump 2, a heat exchanger 3, a high-pressure pump 4 and a filter 5 arranged in sequence from the ammonia fuel tank 1 to the ammonia engine 8; wherein:

[0075] The low-pressure pump 2 is used to pressurize the liquid ammonia in the ammonia fuel tank 1 to generate low-pressure liquid ammonia;

[0076] Heat exchanger 3 is used to heat or cool low-pressure liquid ammonia and output fuel that meets the temperature requirements of the ammonia engine;

[0077] The high-pressure pump 4 is used to further pressurize the mixture of the fuel output from the heat exchanger 3 and the liquid ammonia converted by the ammonia BOG recovery and reuse system, and output fuel that meets the pressure requirements of the ammonia engine;

[0078] The filter 5 is used to filter the fuel output by the high-pressure pump 4 and finally output ammonia fuel that meets the pressure and temperature requirements of the ammonia engine.

[0079] In a preferred embodiment, the ammonia fuel supply system further includes any one or more of the following components:

[0080] - A main valve 6 and / or FVT valve block 7 disposed between the filter 5 and the ammonia engine 8; the main valve 6 is used for emergency shutoff of the ammonia fuel engine; the FVT valve block 7 is used to regulate the flow and pressure of the engine inlet and to perform purging before and after engine startup;

[0081] - A reflux cooler 9 is provided between the FVT valve block unit 7 and the heat exchanger 3, wherein the reflux cooler 9 is used to fully exchange heat between the liquid ammonia refluxed from the engine and the cooling source, so that the temperature of the cooled liquid ammonia is consistent with the outlet temperature of the heat exchanger 3.

[0082] In a preferred embodiment, the main valve 6 is disposed at the front end of the FVT valve group unit 7 .

[0083] The ammonia fuel supply system and its ammonia BOG recovery and reuse system and method provided by the above-mentioned embodiments of the present invention enable the ammonia BOG in the ammonia fuel tank to be compressed and liquefied before being directly transported into the ammonia fuel supply system to participate in the production of ammonia fuel for supply to the ammonia engine for combustion, thereby improving fuel utilization. The ammonia BOG in the ammonia fuel tank, after being compressed and liquefied, is then transported to the high-pressure pump, thereby reducing the design pressure of the BOG compressor 11 and the cost of using a high-pressure BOG compressor. The BOG condenser can use seawater or refrigerant for heat exchange with the ammonia BOG, ensuring that the cooled temperature precisely meets the requirements of the main engine, thereby saving energy consumption on the ship.

[0084] Matters not mentioned in the above embodiments of the present invention are well known in the art.

[0085] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. An ammonia BOG recovery and reuse system for a marine fuel supply system, characterized in that: It comprises a buffer tank (10), a BOG compressor (11), a BOG condenser (12), a gas-liquid separation tank (13) and a control valve (14) which are connected in sequence; wherein: The buffer tank (10) is connected to the ammonia fuel tank (1) and is used to store ammonia BOG generated by the ammonia fuel tank (1); The BOG compressor (11) is used to perform pressurization processing on the ammonia BOG; the outlet pressure of the BOG compressor (11) is 18-25 bar; The BOG condenser (12) is used to perform heat exchange treatment on the pressurized ammonia BOG to obtain liquid ammonia containing ammonia BOG that meets the temperature requirements of the ammonia engine; The gas-liquid separation tank (13) is used to perform gas-liquid separation on the liquid ammonia containing ammonia BOG, and by pressurizing the ammonia BOG located at the top of the tank, the pressure in the gas-liquid separation tank (13) is controlled to 27 bar, and then the ammonia BOG in the gas phase space in the tank is pressurized and liquefied again, thereby completing the conversion of the ammonia BOG; The control valve (14) is used to control the liquid level of the liquid ammonia in the gas-liquid separation tank (13) and to transport the recovered liquid ammonia to the supply system for reuse.

2. The ammonia BOG recovery and reuse system for a marine fuel supply system according to claim 1, characterized in that: A pressure sensor (15) is provided in the ammonia fuel tank (1) for monitoring the pressure in the ammonia fuel tank (1); the BOG compressor (11) is started when the pressure in the ammonia fuel tank (1) reaches a set value.

3. The ammonia BOG recovery and reuse system for a marine fuel supply system according to claim 1, characterized in that: The BOG condenser (12) uses seawater or refrigerant to perform heat exchange treatment on the pressurized ammonia BOG.

4. The ammonia BOG recovery and reuse system for a marine fuel supply system according to claim 1, characterized in that: The outlet temperature of the BOG condenser (12) is 25-45°C.

5. A method for recovering and reusing ammonia BOG for a marine fuel supply system using the system according to any one of claims 1 to 4, characterized in that: include: Obtaining ammonia BOG generated by the ammonia fuel tank (1); performing a pressurization treatment on the ammonia BOG; performing heat exchange treatment on the pressurized ammonia BOG to obtain liquid ammonia containing ammonia BOG that meets the temperature requirements of the ammonia engine; The liquid ammonia containing ammonia BOG is subjected to gas-liquid separation to complete the conversion of the ammonia BOG and realize the recovery and reuse of the ammonia BOG.

6. A marine fuel supply system, characterized in that: include: The ammonia BOG recovery and reuse system and the ammonia fuel supply system according to any one of claims 1 to 4; wherein: The ammonia BOG recovery and reuse system is arranged between the ammonia fuel tank (1) and the ammonia fuel supply system, and is used to compress and reliquefy the ammonia BOG produced in the ammonia fuel tank (1), thereby converting the ammonia BOG into liquid ammonia that meets the temperature requirements of the ammonia engine; The ammonia fuel supply system is arranged between the ammonia fuel tank (1) and the ammonia engine (8), and is connected to the ammonia BOG recovery and reuse system. It is used to mix the liquid ammonia output from the ammonia fuel tank (1) with the liquid ammonia converted by the ammonia BOG recovery and reuse system, and then perform a pressurized filtration process, and finally output ammonia fuel that meets the pressure and temperature requirements of the ammonia engine to the ammonia engine (8).

7. The marine fuel supply system according to claim 6, characterized in that: The ammonia fuel supply system comprises: a low-pressure pump (2), a heat exchanger (3), a high-pressure pump (4) and a filter (5) arranged in sequence from the ammonia fuel tank (1) to the ammonia engine (8); wherein: The low-pressure pump (2) is used to pressurize the liquid ammonia in the ammonia fuel tank (1) to generate low-pressure liquid ammonia; The heat exchanger (3) is used to heat or cool the low-pressure liquid ammonia and output fuel that meets the temperature requirements of the ammonia engine; The high-pressure pump (4) is used to further pressurize the mixture of the fuel output from the heat exchanger (3) and the liquid ammonia converted by the ammonia BOG recovery and reuse system, and output fuel that meets the pressure requirements of the ammonia engine; The filter (5) is used to filter the fuel output by the high-pressure pump (4), and ultimately output ammonia fuel that meets the pressure and temperature requirements of the ammonia engine.

8. The marine fuel supply system according to claim 7, characterized in that: The ammonia fuel supply system further includes any one or more of the following components: - a main valve (6) and / or an FVT valve group unit (7) disposed between the filter (5) and the ammonia engine (8); wherein the main valve (6) is used for emergency shutoff of the ammonia fuel engine; and the FVT valve group unit (7) is used for regulating the flow rate and pressure of the engine inlet and for purging before and after the engine is started; - A reflux cooler (9) provided between the FVT valve group unit (7) and the heat exchanger (3); wherein the reflux cooler (9) is used to fully exchange heat between the liquid ammonia refluxed from the engine and the cooled cold source, so that the temperature of the cooled liquid ammonia is consistent with the outlet temperature of the heat exchanger (3).

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