Ammonia fuel supply system and supply method for ships

Abstract

This invention provides an ammonia fuel supply system and method for ships. The system includes: a fuel supply device, a fuel recovery device, an evaporation gas treatment device, and a circulation tank. The fuel supply device supplies fuel that meets the required conditions from a fuel storage tank to the main engine. The fuel recovery device transports the recovered fuel through the circulation tank to a second supply pipeline to participate in the fuel transport cycle. The evaporation gas treatment device compresses and heats the evaporation gas output from the fuel storage tank before storing it or allowing it to participate in the fuel transport cycle. This invention connects a compressor and a low-pressure pump in parallel, enabling the supply of fuel with suitable conditions to the main engine, recovering fuel returned from the main engine, and treating the evaporation gas in the storage tank to effectively control the pressure inside the tank. It features a simple structure and reliable operation, ensuring a safe supply of ammonia fuel on ships.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel supply for ships, and in particular to an ammonia fuel supply system and a supply method for ships in which a compressor and a low-pressure pump are connected in parallel to supply fuel. Background Art

[0002] Ammonia has a carbon-free and sulfur-free molecular structure, and does not emit carbon dioxide when burned. It can reduce the impact of shipping on global warming, and it is not difficult to store and handle. The use of ammonia as a ship fuel is attracting much attention. In response to this, major ship engine manufacturers have decided to develop ammonia fuel engines. MAN plans to launch an ammonia fuel main engine for ships in 2024. The main engine needs to supply liquid ammonia with a pressure of 80 barg and a temperature of 25 to 45°C. This requires the configuration of a liquid ammonia fuel supply system to provide the main engine with liquid ammonia of suitable pressure, temperature and flow, and to recover the liquid ammonia fuel refluxed from the main engine. Because the storage tank continuously absorbs heat from the outside, the evaporation of liquid ammonia in the storage tank will cause the pressure in the tank to increase, and measures must be taken to prevent overpressure in the tank.

[0003] In existing boil-off gas processing equipment, boil-off gas needs to be pressurized by a compressor, then cooled, condensed and reliquefied. This requires the outside world to provide a large amount of cold energy to the reliquefaction heat exchanger, and the overall energy consumption of the ship is very high. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides an ammonia fuel supply system and a supply method for ships in which a compressor and a low-pressure pump are connected in parallel for supplying fuel.

[0005] According to one aspect of the present invention, an ammonia fuel supply system for a ship is provided, characterized in that it comprises: a fuel supply device, a fuel recovery device, an evaporation gas treatment device and a circulation tank; wherein:

[0006] The fuel supply device comprises: a first supply pipeline and a second supply pipeline, wherein the first supply pipeline is connected between the fuel storage tank and the circulation tank, and the second supply pipeline is connected between the circulation tank and the main engine, and is used to supply the fuel that meets the conditions from the fuel storage tank to the main engine;

[0007] The fuel recovery device comprises: a first recovery pipeline and a second recovery pipeline connected between the main engine and the circulation tank, wherein the first recovery pipeline is used to recover the ammonia fuel refluxed from the main engine, and the recovered fuel is transported to the second supply pipeline through the circulation tank to participate in the fuel transportation cycle; the second recovery pipeline is used to recover the ammonia fuel remaining after the main engine is shut down, and the recovered fuel is transported to the second supply pipeline through the circulation tank to participate in the fuel transportation cycle;

[0008] The evaporated gas processing device comprises: a compressor device, a reliquefaction auxiliary heat exchanger, a first output pipeline and a second output pipeline; wherein: the output end of the fuel storage tank, the compressor device, the reliquefaction auxiliary heat exchanger and the input end of the fuel storage tank are sequentially connected through the first output pipeline to form a first circulation pipeline, which is used to compress and heat-exchange the evaporated gas output by the fuel storage tank, and then return it to the fuel storage tank to participate in the fuel supply; the output end of the fuel storage tank, the compressor device, the second supply pipeline and the circulation tank are sequentially connected through the second output pipeline to form a second circulation pipeline, which is used to compress and heat-exchange the evaporated gas output by the fuel storage tank, and then transport it to the circulation tank to participate in the fuel transportation cycle.

[0009] Optionally, the first supply pipeline includes a low-pressure pump, which is disposed inside the fuel storage tank and connected to the circulation tank through a pipeline, and pumps ammonia fuel from the fuel storage tank to the circulation tank by pressurizing.

[0010] Optionally, the second supply pipeline includes: a high-pressure pump, a reliquefaction main heat exchanger, a fuel heater and a filter connected in sequence through pipelines; the ammonia fuel passes through the high-pressure pump, the reliquefaction main heat exchanger, the fuel heater and the filter in sequence to generate ammonia fuel that meets the host conditions and is supplied to the host.

[0011] Optionally, in the second circulation pipeline, the compressor device, the reliquefaction main heat exchanger of the second supply pipeline and the circulation tank are connected in sequence through the second output pipeline.

[0012] Optionally, a de-reliquefaction main heat exchanger regulating valve is provided on the second output pipeline between the compressor device and the reliquefaction main heat exchanger, for controlling the fuel flow of the second circulation pipeline.

[0013] Optionally, a temperature sensor is provided at the outlet end of the reliquefaction main heat exchanger for monitoring the outlet temperature of the reliquefaction main heat exchanger, and controlling the operation of the second circulation pipeline or the first circulation pipeline according to the outlet temperature; wherein, when the outlet temperature is less than a set temperature threshold, the second circulation pipeline operates and the first circulation pipeline is closed; when the outlet temperature is greater than or equal to the set temperature threshold, the second circulation pipeline is closed and the first circulation pipeline operates.

[0014] Optionally, a fuel return valve is provided on the first recovery line.

[0015] Optionally, a purge reflux valve is provided on the second recovery pipeline.

[0016] Optionally, a de-reliquefaction auxiliary heat exchanger control valve is provided on the first output pipeline between the compressor device and the reliquefaction auxiliary heat exchanger, for controlling the fuel flow of the first circulation pipeline.

[0017] According to another aspect of the present invention, there is provided an ammonia fuel supply method for a ship, comprising: a fuel supply part, a fuel recovery part and an evaporated gas treatment part; wherein:

[0018] The fuel supply part comprises:

[0019] obtaining initial ammonia fuel from a fuel storage tank and pre-storing it;

[0020] The pre-stored initial ammonia fuel and / or the reusable reflux ammonia fuel are used as the ammonia fuel to be supplied for supply processing, and the fuel that can meet the conditions is generated and output to the main engine, thereby completing the fuel supply from the fuel storage tank to the main engine;

[0021] The fuel recovery part includes:

[0022] The ammonia fuel refluxed from the main engine or the residual ammonia fuel after shutdown is obtained and pre-stored to form reusable reflux ammonia fuel and complete fuel recovery.

[0023] The evaporation gas processing part comprises:

[0024] After being compressed and heat-exchanged, the evaporated gas output from the fuel storage tank is returned to the fuel storage tank to participate in the fuel supply or as ammonia fuel to be supplied, participating in the fuel delivery cycle.

[0025] 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:

[0026] The ammonia fuel supply system and method for ships provided by the present invention connects a compressor and a low-pressure pump in parallel to supply fuel, can provide fuel with suitable conditions for the main engine, recover the fuel refluxed from the main engine, and can process the evaporated gas in the storage tank, effectively controlling the pressure in the tank.

[0027] The ammonia fuel supply system and supply method for ships provided by the present invention fully utilize the cold energy generated by heat exchange during the supply of liquid ammonia fuel, and do not require a large amount of cold energy to be provided by the outside to liquefy the boil-off gas, thereby greatly reducing the overall energy consumption of the ship.

[0028] The ammonia fuel supply system and supply method for ships provided by the present invention have simple structure and reliable operation, thus providing guarantee for the safe supply of ammonia fuel on ships. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0030] Figure 1 The figure is a schematic structural diagram of an ammonia fuel supply system for ships in a preferred embodiment of the present invention.

[0031] In the figure: 1 is a storage tank, 2 is a low-pressure pump, 3 is a circulation tank, 4 is a high-pressure pump, 5 is a reliquefaction main heat exchanger, 6 is a fuel heater, 7 is a filter, 8 is a main engine, 9 is a compressor unit, 10 is a reliquefaction auxiliary heat exchanger, 11 is a control valve for the de-reliquefaction auxiliary heat exchanger, 12 is a regulating valve for the de-reliquefaction main heat exchanger, 13 is a fuel reflux valve, and 14 is a purge reflux valve. DETAILED DESCRIPTION

[0032] The following is a detailed description of the embodiments of the present invention: This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

[0033] An embodiment of the present invention provides an ammonia fuel supply system for a ship, such as Figure 1 As shown, the system may include: a fuel supply device, a fuel recovery device, an evaporation gas treatment device and a circulation tank 3; wherein:

[0034] The fuel supply device comprises: a first supply pipeline and a second supply pipeline, wherein the first supply pipeline is connected between the fuel storage tank 1 and the circulation tank 3, and the second supply pipeline is connected between the circulation tank 3 and the main engine 8, and is used to supply the fuel that meets the conditions from the fuel storage tank 1 to the main engine 8;

[0035] The fuel recovery device comprises: a first recovery pipeline and a second recovery pipeline connected between the main engine 8 and the circulation tank 3, wherein the first recovery pipeline is used to recover the ammonia fuel refluxed from the main engine 8, and the recovered fuel is transported to the second supply pipeline through the circulation tank 3 to participate in the fuel transportation cycle; the second recovery pipeline is used to recover the ammonia fuel remaining after the main engine is shut down, and the recovered fuel is transported to the second supply pipeline through the circulation tank 3 to participate in the fuel transportation cycle;

[0036] The boil-off gas processing device comprises: a compressor device 9, a reliquefaction auxiliary heat exchanger 10, a first output pipeline and a second output pipeline; wherein: the output end of the fuel storage tank 1, the compressor device 9, the reliquefaction auxiliary heat exchanger 10 and the input end of the fuel storage tank 1 are sequentially connected through the first output pipeline to form a first circulation pipeline, which is used to compress and heat-exchange the boil-off gas output by the fuel storage tank 1, and then return it to the fuel storage tank 1 to participate in the fuel supply; the output end of the fuel storage tank 1, the compressor device 9, the second supply pipeline and the circulation tank 3 are sequentially connected through the second output pipeline to form a second circulation pipeline, which is used to compress and heat-exchange the boil-off gas output by the fuel storage tank 1, and then transport it to the circulation tank 3 to participate in the fuel transportation cycle.

[0037] In a preferred embodiment, the first supply pipeline includes a low-pressure pump 2, which is disposed inside the fuel storage tank 1 and connected to the circulation tank 3 through a pipeline, and pumps ammonia fuel from the fuel storage tank 1 to the circulation tank 3 by pressurizing.

[0038] In a preferred embodiment, the second supply pipeline includes: a high-pressure pump 4, a reliquefaction main heat exchanger 5, a fuel heater 6 and a filter 7 connected in sequence through pipelines; the ammonia fuel passes through the high-pressure pump 4, the reliquefaction main heat exchanger 5, the fuel heater 6 and the filter 7 in sequence to generate an ammonia fuel that meets the host conditions and is supplied to the host.

[0039] In a preferred embodiment, in the second circulation line, the compressor device 9, the reliquefaction main heat exchanger 5 of the second supply line and the circulation tank 3 are connected in sequence through the second output line.

[0040] In a preferred embodiment, a de-reliquefaction main heat exchanger regulating valve 12 is provided on the second output pipeline between the compressor device 9 and the reliquefaction main heat exchanger 5 for controlling the fuel flow rate of the second circulation pipeline.

[0041] In a preferred embodiment, a temperature sensor is provided at the outlet of the reliquefaction main heat exchanger 5, which is used to monitor the outlet temperature of the reliquefaction main heat exchanger 5, and control the operation of the second circulation pipeline or the first circulation pipeline by the outlet temperature; wherein, when the outlet temperature is less than the set temperature threshold, the second circulation pipeline is operated and the first circulation pipeline is closed; when the outlet temperature is greater than or equal to the set temperature threshold, the second circulation pipeline is closed and the first circulation pipeline is operated. Further, when the outlet temperature is greater than or equal to the set threshold a, the opening of the de-reliquefaction main heat exchanger regulating valve 12 is reduced, and when the outlet temperature is greater than or equal to the set threshold b, the de-reliquefaction main heat exchanger regulating valve 12 is closed and the first circulation pipeline is opened.

[0042] In a preferred embodiment, a fuel return valve 13 is provided on the first recovery line.

[0043] In a preferred embodiment, a purge reflux valve 14 is provided on the second recovery line.

[0044] In a preferred embodiment, a de-reliquefaction auxiliary heat exchanger control valve 11 is provided on the first output pipeline between the compressor device 9 and the reliquefaction auxiliary heat exchanger 10 for controlling the fuel flow rate of the first circulation pipeline.

[0045] An embodiment of the present invention provides an ammonia fuel supply method for a ship, which may include: a fuel supply part, a fuel recovery part and an evaporated gas treatment part; wherein:

[0046] Fuel supply section, including:

[0047] obtaining initial ammonia fuel from a fuel storage tank and pre-storing it;

[0048] The pre-stored initial ammonia fuel and / or the reusable reflux ammonia fuel are used as the ammonia fuel to be supplied for supply processing, and the fuel that can meet the conditions is generated and output to the main engine, thereby completing the fuel supply from the fuel storage tank to the main engine;

[0049] Fuel recovery section, including:

[0050] The ammonia fuel refluxed from the main engine or the residual ammonia fuel after shutdown is obtained and pre-stored to form reusable reflux ammonia fuel and complete fuel recovery.

[0051] The evaporation gas treatment part includes:

[0052] After being compressed and heat-exchanged, the evaporated gas output from the fuel storage tank is returned to the fuel storage tank to participate in the fuel supply or as ammonia fuel to be supplied, participating in the fuel delivery cycle.

[0053] It should be noted that the steps in the method provided by the present invention can be implemented by using corresponding devices, components, etc. in the system. 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.

[0054] The technical solutions provided by the above embodiments of the present invention are further described below.

[0055] The ammonia fuel supply system for ships provided by the above embodiment of the present invention, the fuel supply device uses a low-pressure pump to pressurize liquid ammonia into low-pressure liquid ammonia of a certain pressure, and the low-pressure liquid ammonia flows into the circulation tank. The liquid ammonia is further pressurized by the high-pressure pump from the bottom of the circulation tank, and the high-pressure liquid ammonia exchanges heat with the low-pressure ammonia gas at the outlet of the compressor in the reliquefaction main heat exchanger to liquefy it, and then it is heated by the fuel heater after heat exchange, and impurities are removed by the filter and supplied to the main engine. The fuel recovery device transports the fuel refluxed by the main engine and the residual fuel after shutdown to the circulation tank, and re-enters the fuel supply cycle as ammonia fuel. The evaporation gas treatment device pressurizes the excess evaporation gas in the storage tank into low-pressure ammonia gas through the compressor unit. The low-pressure ammonia gas is divided into two paths, one of which is liquefied through the reliquefaction main heat exchanger, and the cold energy generated by the heat exchange during the supply of liquid ammonia fuel is fully utilized to liquefy the evaporation gas, and then recovered to the circulation tank as the supply fuel of the high-pressure pump. The other low-pressure ammonia gas can also be liquefied through the reliquefaction auxiliary heat exchanger and refluxed into the storage tank.

[0056] In some embodiments of the present invention:

[0057] The low-pressure pump 2, the circulation tank 3, the high-pressure pump 4, the reliquefaction main heat exchanger 5, the fuel heater 6, and the filter 7 are connected in sequence through pipelines. The return line of the main engine 8 is connected to the circulation tank 3. The return line is divided into two routes. The first route is connected to the fuel return valve 13 and then goes to the circulation tank 3. The second route is connected to the purge return valve 14 and then goes to the circulation tank 3.

[0058] After the evaporated gas leaves the storage tank 1, it goes to the compressor unit. The low-pressure ammonia gas is divided into two paths. One path is connected to the reliquefaction auxiliary heat exchanger control valve 11, the reliquefaction auxiliary heat exchanger 10 and the storage tank, and the other path is connected to the reliquefaction main heat exchanger regulating valve 12, the reliquefaction main heat exchanger 5 and the circulation tank 3.

[0059] The low-pressure liquid ammonia at the outlet of the circulation tank is connected to the high-pressure pump 4, the reliquefaction main heat exchanger 5, the fuel heater 6, and the filter 7 in sequence through pipelines.

[0060] The low-pressure ammonia gas used as fuel after liquefaction is connected to the reliquefaction main heat exchanger regulating valve 12, the reliquefaction main heat exchanger 5 and the circulation tank 3 in sequence through pipelines.

[0061] The outlet flow and destination of low-pressure ammonia are adjusted. A temperature sensor is set at the outlet of the low-pressure liquid ammonia of the reliquefaction main heat exchanger 5, and the de-reliquefaction main heat exchanger regulating valve 12 is controlled according to the outlet temperature of the reliquefaction main heat exchanger 5 monitored by the temperature sensor. When the sensor temperature is high, the regulating valve opening is reduced. When the sensor temperature is too high, the regulating valve 12 is closed, and the de-reliquefaction auxiliary heat exchanger control valve 11 is opened, and the low-pressure ammonia will be stored in the storage tank after liquefaction.

[0062] Furthermore, the specific process of fuel supply and recovery is as follows:

[0063] The low-pressure pump 2 is installed inside the storage tank 1. The liquid ammonia in the storage tank 1 is pressurized into low-pressure liquid ammonia by the low-pressure pump 2 and injected into the circulation tank 3. The low-pressure liquid ammonia is then discharged from the bottom of the circulation tank 3, and is further pressurized into high-pressure liquid ammonia by the high-pressure pump 4, so that its pressure meets the requirements of the main engine 8. The high-pressure liquid ammonia first passes through the reliquefaction main heat exchanger 5 to provide cold energy for the reliquefaction process, and then is heated by the fuel heater 6 to meet the requirements of the main engine 8. After the high-pressure liquid ammonia is heated, it is filtered through the filter 7 and finally enters the main engine 8 as fuel. The refluxed fuel is discharged from the main engine 8, and then passes through the fuel reflux valve 13 and is injected into the circulation tank 3. When the main engine is shut down, it is necessary to use nitrogen to purge the main engine and pipelines. At this time, the fuel reflux valve 13 is closed and the purge reflux valve 14 is opened.

[0064] Furthermore, the specific process of the evaporation gas treatment part is as follows:

[0065] The excess evaporation gas at the top of the storage tank enters the compressor unit 9 through a pipeline connection and is pressurized into low-pressure ammonia. The low-pressure ammonia is then divided into two paths, one of which returns to the storage tank after liquefaction, and the other is used as fuel after liquefaction. For the path that returns to the storage tank after liquefaction, the low-pressure ammonia passes through the reliquefaction auxiliary heat exchanger control valve 11 and the reliquefaction auxiliary heat exchanger 10, and returns to the tank after liquefaction. For the path that is used as fuel after liquefaction, the low-pressure ammonia passes through the reliquefaction main heat exchanger regulating valve 12 and the reliquefaction main heat exchanger 5, and returns to the circulation tank 3 after liquefaction, and enters the high-pressure pump 4 as fuel.

[0066] When the load of the main engine 8 is low or it is shut down, the liquid ammonia flow rate at the outlet of the high-pressure pump is low, and it is impossible to supply high-pressure liquid ammonia with sufficient cooling energy. However, the pressure of the storage tank still needs to be controlled, so the outlet direction and flow rate of the low-pressure ammonia need to be adjusted. A temperature sensor is set on the low-pressure liquid ammonia pipeline between the reliquefaction main heat exchanger 5 and the circulation tank 3, and the regulating valve 12 of the de-reliquefaction main heat exchanger is controlled according to the temperature measured by the sensor. When the sensor temperature is high, the opening of the regulating valve 12 is reduced. When the sensor temperature is too high, the regulating valve 12 is closed, and the control valve 11 of the de-reliquefaction auxiliary heat exchanger is opened, and the low-pressure ammonia will be stored in the storage tank after liquefaction.

[0067] The ammonia fuel supply system and method for ships provided by the present invention connect a compressor and a low-pressure pump in parallel to provide fuel with suitable conditions for the main engine, recover the fuel refluxed from the main engine, and process the evaporated gas in the storage tank to effectively control the pressure in the storage tank; it has the characteristics of simple structure and reliable operation, and provides a guarantee for the safe supply of ammonia fuel on ships.

[0068] All matters not covered in the above embodiments of the present invention are well known in the art.

[0069] 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 modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. An ammonia fuel supply system for a ship, characterized in that: include: Fuel supply device, fuel recovery device, evaporated gas treatment device and circulation tank; wherein: The fuel supply device comprises: a first supply pipeline and a second supply pipeline, wherein the first supply pipeline is connected between the fuel storage tank and the circulation tank, and the second supply pipeline is connected between the circulation tank and the main engine, and is used to supply the fuel that meets the conditions from the fuel storage tank to the main engine; The fuel recovery device comprises: a first recovery pipeline and a second recovery pipeline connected between the main engine and the circulation tank, wherein the first recovery pipeline is used to recover the ammonia fuel refluxed from the main engine, and the recovered fuel is transported to the second supply pipeline through the circulation tank to participate in the fuel transportation cycle; the second recovery pipeline is used to recover the ammonia fuel remaining after the main engine is shut down, and the recovered fuel is transported to the second supply pipeline through the circulation tank to participate in the fuel transportation cycle; The boil-off gas processing device comprises: a compressor device, a reliquefaction auxiliary heat exchanger, a first output pipeline and a second output pipeline; wherein: the output end of the fuel storage tank, the compressor device, the reliquefaction auxiliary heat exchanger and the input end of the fuel storage tank are sequentially connected through the first output pipeline to form a first circulation pipeline, which is used to compress and heat-exchange the boil-off gas outputted from the fuel storage tank and then return it to the fuel storage tank to participate in fuel supply; the output end of the fuel storage tank, the compressor device, the second supply pipeline and the circulation tank are sequentially connected through the second output pipeline to form a second circulation pipeline, which is used to compress and heat-exchange the boil-off gas outputted from the fuel storage tank and then transport it to the circulation tank to participate in fuel transportation cycle; The first supply pipeline includes a low-pressure pump, which is disposed inside the fuel storage tank and connected to the circulation tank through a pipeline, and pumps ammonia fuel from the fuel storage tank to the circulation tank by pressurizing; The second supply pipeline includes: a high-pressure pump, a reliquefaction main heat exchanger, a fuel heater and a filter connected in sequence through pipelines; the ammonia fuel passes through the high-pressure pump, the reliquefaction main heat exchanger, the fuel heater and the filter in sequence to generate ammonia fuel that meets the host conditions and is supplied to the host; In the second circulation line, the compressor device, the reliquefaction main heat exchanger of the second supply line and the circulation tank are sequentially connected through the second output line; A de-reliquefaction main heat exchanger regulating valve is provided on the second output pipeline between the compressor device and the reliquefaction main heat exchanger, for controlling the fuel flow of the second circulation pipeline; A temperature sensor is provided at the outlet end of the reliquefaction main heat exchanger for monitoring the outlet temperature of the reliquefaction main heat exchanger and controlling the operation of the second circulation pipeline or the first circulation pipeline according to the outlet temperature; wherein, when the outlet temperature is less than a set temperature threshold, the second circulation pipeline operates and the first circulation pipeline is closed; when the outlet temperature is greater than or equal to the set temperature threshold, the second circulation pipeline is closed and the first circulation pipeline operates.

2. The ammonia fuel supply system for ships according to claim 1, characterized in that: The first recovery pipeline is provided with a fuel return valve.

3. The ammonia fuel supply system for ships according to claim 1, characterized in that: The second recovery pipeline is provided with a purge reflux valve.

4. The ammonia fuel supply system for ships according to claim 1, characterized in that: A de-reliquefaction auxiliary heat exchanger control valve is provided on the first output pipeline between the compressor device and the reliquefaction auxiliary heat exchanger, for controlling the fuel flow of the first circulation pipeline.

5. An ammonia fuel supply method using the ammonia fuel supply system for a ship according to claim 1, characterized in that: include: Fuel supply section, fuel recovery section and evaporated gas treatment section; wherein: The fuel supply part comprises: obtaining initial ammonia fuel from a fuel storage tank and pre-storing it; The pre-stored initial ammonia fuel and / or the reusable reflux ammonia fuel are used as the ammonia fuel to be supplied for supply processing, and the fuel that can meet the conditions is generated and output to the main engine, thereby completing the fuel supply from the fuel storage tank to the main engine; The fuel recovery part includes: Obtain the ammonia fuel refluxed from the main engine or the residual ammonia fuel after shutdown and pre-store it to form reusable reflux ammonia fuel and complete fuel recovery; The evaporation gas processing part comprises: After being compressed and heat-exchanged, the evaporated gas output from the fuel storage tank is returned to the fuel storage tank to participate in the fuel supply or as ammonia fuel to be supplied, participating in the fuel delivery cycle.

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