Fuel supply and recovery system of ammonia fuel engine

Abstract

The utility model relates to the technical field of vehicles, and particularly discloses a fuel supply and recovery system of an ammonia fuel engine, which comprises a liquid ammonia tank, an ejector, a supply pipeline, a supply device, a recovery pipeline, a storage tank, a recovery pump, a pressurizing device, a pressurizing pipeline and a first electromagnetic control valve, and the supply pipeline is connected between the liquid ammonia tank and the ejector; the supply device is arranged on the supply pipeline and is used for conveying liquid ammonia in the liquid ammonia tank to the ejector, and the recovery pipeline is selectively communicated with the supply pipeline; the storage tank is communicated with the recovery pipeline; the recovery pump is arranged on the recovery pipeline and is used for conveying the ammonia fuel in the supply pipeline into the storage tank; the pressurizing device is communicated with the storage tank through a pressurizing pipeline and is used for pressurizing the ammonia fuel so as to liquefy the ammonia fuel; the first electromagnetic control valve is arranged on the pressurizing pipeline and used for connecting or disconnecting the pressurizing pipeline. Ammonia fuel is recovered through the recovery pump and liquefied through the pressurizing device, other gas cannot be mixed, the recovery process can be simplified, and the recovery cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a fuel supply and recovery system for an ammonia fuel engine. Background Art

[0002] Internal combustion engines usually use gasoline or diesel as the main fuel, and the carbon dioxide generated during operation is likely to cause climate change. Ammonia (NH3) is an excellent carbon-free hydrogen carrier and an attractive alternative to fossil fuels. The combustion of ammonia eliminates carbon emissions and sulfur emissions, so ammonia fuel engines have emerged. However, ammonia should be handled with special care when used for the combustion of internal combustion engines, because leakage can cause serious health damage, such as burning the human skin, eyes and the mucous membranes of the respiratory organs, and excessive inhalation by humans can even cause lung swelling, etc.

[0003] In order to ensure the safe use of ammonia fuel engines, in the prior art, when the ammonia engine stops working, nitrogen is usually used to purge the pipeline supplying ammonia to the engine until all the ammonia in the pipeline is discharged to ensure safe use, and then nitrogen and liquid ammonia are separated to recover ammonia. However, the separation operation process of nitrogen and liquid ammonia is complex and costly. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a fuel supply and recovery system for an ammonia fuel engine to simplify the ammonia recovery cost on the premise of ensuring the safe use of the ammonia fuel engine.

[0005] The utility model provides a fuel supply and recovery system for an ammonia fuel engine, and the fuel supply and recovery system for the ammonia fuel engine includes:

[0006] A liquid ammonia tank for storing liquid ammonia;

[0007] An injector for injecting liquid ammonia;

[0008] A supply pipeline connected between the liquid ammonia tank and the injector;

[0009] A supply device arranged on the supply pipeline, and the supply device is used to transport the liquid ammonia in the liquid ammonia tank to the injector;

[0010] A recovery pipeline selectively communicated with the supply pipeline;

[0011] A storage tank communicated with the recovery pipeline;

[0012] A recovery pump arranged on the recovery pipeline, and the recovery pump is used to transport the ammonia fuel in the supply pipeline to the storage tank;

[0013] A pressurizing device, which is connected to the storage tank through a pressurizing pipeline, and the pressurizing device is used to pressurize ammonia fuel to liquefy the ammonia fuel;

[0014] A first electromagnetic control valve, which is arranged on the pressurizing pipeline, and the first electromagnetic control valve is used to connect or disconnect the pressurizing pipeline.

[0015] As a preferred technical solution of the fuel supply and recovery system of an ammonia fuel engine, the fuel supply and recovery system of the ammonia fuel engine further includes a connecting pipeline connecting the pressurizing device and the liquid ammonia tank, and a first one-way valve arranged on the connecting pipeline, and the first one-way valve is configured to only allow ammonia fuel to flow from the pressurizing device to the liquid ammonia tank.

[0016] As a preferred technical solution of the fuel supply and recovery system of an ammonia fuel engine, the fuel supply and recovery system of the ammonia fuel engine further includes a filter arranged on the connecting pipeline, and the filter is located between the first one-way valve and the pressurizing device.

[0017] As a preferred technical solution of the fuel supply and recovery system of an ammonia fuel engine, the fuel supply and recovery system of the ammonia fuel engine further includes a second electromagnetic control valve arranged on the connecting pipeline, the second electromagnetic control valve is located between the filter and the pressurizing device, and the second electromagnetic control valve is used to connect or disconnect the connecting pipeline.

[0018] As a preferred technical solution of the fuel supply and recovery system of an ammonia fuel engine, the fuel supply and recovery system of the ammonia fuel engine further includes a second one-way valve arranged on the recovery pipeline, the second one-way valve is located between the recovery pump and the storage tank, and the second one-way valve is configured to only allow ammonia fuel to flow from the recovery pump to the storage tank.

[0019] As a preferred technical solution of the fuel supply and recovery system of an ammonia fuel engine, the fuel supply and recovery system of the ammonia fuel engine further includes a bypass pipeline, and a third one-way valve arranged on the bypass pipeline, both ends of the bypass pipeline are respectively connected to the supply pipeline and the storage tank, and the third one-way valve is configured to only allow ammonia fuel to flow from the supply pipeline to the storage tank.

[0020] As a preferred technical solution of the fuel supply and recovery system of an ammonia fuel engine, the supply device includes a first solenoid valve, a liquid ammonia pump, a second solenoid valve, a common rail pipe and a third solenoid valve arranged in sequence on the supply pipeline along the direction of transporting ammonia fuel in the supply pipeline, the second solenoid valve is used to connect or disconnect the recovery pipeline and the supply pipeline, and both the first solenoid valve and the third solenoid valve are used to connect or disconnect the supply pipeline.

[0021] As a preferred technical solution of the fuel supply and recovery system of an ammonia fuel engine, the fuel supply and recovery system of the ammonia fuel engine further includes an overflow pipeline and an overflow valve provided on the overflow pipeline, and two ends of the overflow pipeline are respectively connected to the common rail pipe and the storage tank.

[0022] As a preferred technical solution of the fuel supply and recovery system of an ammonia fuel engine, the fuel supply and recovery system of the ammonia fuel engine further includes a purge tank, a purge pipeline, a discharge pipeline and a burner. The purge tank is used for storing purge gas, and the purge tank is communicated with the purge pipeline. The discharge pipeline is communicated with the burner. The first solenoid valve is used to connect or disconnect the purge pipeline and the supply pipeline. The third solenoid valve is used to connect or disconnect the discharge pipeline and the supply pipeline.

[0023] As a preferred technical solution of the fuel supply and recovery system of an ammonia fuel engine, the fuel supply and recovery system of the ammonia fuel engine further includes a pressure reducing valve provided on the purge pipeline.

[0024] The fuel supply and recovery system of the ammonia fuel engine provided by the present utility model at least has the following beneficial effects:

[0025] The fuel supply and recovery system of the ammonia fuel engine includes a liquid ammonia tank, an injector, a supply pipeline, a supply device, a recovery pipeline, a storage tank, a recovery pump, a pressurizing device, a pressurizing pipeline and a first electromagnetic control valve. The liquid ammonia tank is used for storing liquid ammonia; the supply pipeline is connected between the liquid ammonia tank and the injector; the supply device is arranged on the supply pipeline, and the supply device is used to transport the liquid ammonia in the liquid ammonia tank to the injector. The injector is used to inject liquid ammonia. The recovery pipeline is selectively communicated with the supply pipeline; the storage tank is communicated with the recovery pipeline; the recovery pump is arranged on the recovery pipeline, and the recovery pump is used to transport the ammonia fuel in the supply pipeline to the storage tank; the pressurizing device is communicated with the storage tank through the pressurizing pipeline, and the pressurizing device is used to pressurize the ammonia fuel to liquefy the ammonia fuel; the first electromagnetic control valve is arranged on the pressurizing pipeline, and the first electromagnetic control valve is used to connect or disconnect the pressurizing pipeline. When the ammonia fuel engine stops working, the recovery pipeline is communicated with the supply pipeline, and the ammonia fuel in the supply pipeline and each component on the supply pipeline is transported to the storage tank through the recovery pump. After the ammonia fuel stored in the storage tank reaches a predetermined amount, the first electromagnetic control valve opens the pressurizing pipeline, and then the ammonia fuel is pressurized and liquefied through the pressurizing device to realize the recovery of the ammonia fuel. Compared with the prior art, nitrogen purging is not required, nitrogen will not be mixed in, and thus separation and extraction of liquid ammonia are not required, which can effectively simplify the recovery process of ammonia fuel and reduce the recovery cost. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the fuel supply and recovery system of the ammonia fuel engine in the embodiment of the present utility model.

[0027] In the figure:

[0028] 1. Liquid ammonia tank; 2. Injector; 3. Supply pipeline; 4. Recovery pipeline; 5. Storage tank; 6. Recovery pump; 7. Pressurizing device; 8. Pressurizing pipeline; 9. First electromagnetic control valve; 10. Connecting pipeline; 11. First check valve; 12. Filter; 13. Second electromagnetic control valve; 14. Second check valve; 15. Bypass pipeline; 16. Third check valve; 17. First solenoid valve; 18. Liquid ammonia pump; 19. Second solenoid valve; 20. Common rail pipe; 21. Third solenoid valve; 22. Overflow pipeline; 23. Overflow valve; 24. Purge tank; 25. Purge pipeline; 26. Discharge pipeline; 27. Burner; 28. Pressure reducing valve. Specific embodiments

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0031] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0033] In order to ensure the safe use of an ammonia fuel engine, in the prior art, when the ammonia engine stops working, the pipeline for supplying ammonia to the engine is usually purged with nitrogen until all the ammonia in the pipeline is discharged to ensure safe use, and then the nitrogen and liquid ammonia are separated to recover the ammonia. However, the separation operation process of nitrogen and liquid ammonia is complex and costly.

[0034] In view of this, the present embodiment provides a fuel supply and recovery system for an ammonia fuel engine to solve the above problems. The fuel supply and recovery system for the ammonia fuel engine can be applied to a vehicle.

[0035] As Figure 1 shown, the fuel supply and recovery system for the ammonia fuel engine provided in the present embodiment includes a liquid ammonia tank 1, an injector 2, a supply pipeline 3, a supply device, a recovery pipeline 4, a storage tank 5, a recovery pump 6, a pressurizing device 7, a pressurizing pipeline 8, and a first electromagnetic control valve 9. Among them, the liquid ammonia tank 1 is used to store liquid ammonia; the supply pipeline 3 is connected between the liquid ammonia tank 1 and the injector 2; the supply device is arranged on the supply pipeline 3, and the supply device is used to transport the liquid ammonia in the liquid ammonia tank 1 to the injector 2. The injector 2 is used to inject liquid ammonia, and the injector 2 is arranged in the combustion chamber of the ammonia fuel engine. When the ammonia fuel engine works, the liquid ammonia injected by the injector 2 participates in the combustion reaction in the combustion chamber. The recovery pipeline 4 is selectively communicated with the supply pipeline 3; the storage tank 5 is communicated with the recovery pipeline 4; the recovery pump 6 is arranged on the recovery pipeline 4, and the recovery pump 6 is used to transport the ammonia fuel in the supply pipeline 3 to the storage tank 5; the pressurizing device 7 is communicated with the storage tank 5 through the pressurizing pipeline 8, and the pressurizing device 7 is used to pressurize the ammonia fuel to liquefy the ammonia fuel; the first electromagnetic control valve 9 is arranged on the pressurizing pipeline 8, and the first electromagnetic control valve 9 is used to connect or disconnect the pressurizing pipeline 8.

[0036] The fuel supply and recovery system of the ammonia fuel engine provided in this embodiment, when the ammonia fuel engine is operating, the recovery pipeline 4 is not connected to the supply pipeline 3. The liquid ammonia in the liquid ammonia tank 1 is driven by the supply device to be transported to the injector 2, and the liquid ammonia injected by the injector 2 participates in the combustion reaction in the combustion chamber. When the ammonia fuel engine stops operating, the recovery pipeline 4 is connected to the supply pipeline 3, and the ammonia fuel in the supply pipeline 3 and each component on the supply pipeline 3 is transported to the storage tank 5 by the recovery pump 6. After the ammonia fuel stored in the storage tank 5 reaches a predetermined amount, the first electromagnetic control valve 9 opens the pressurization pipeline 8, and then the ammonia fuel is pressurized and liquefied by the pressurization device 7 to achieve the recovery of ammonia fuel. Compared with the prior art, nitrogen purging is not required, nitrogen will not be mixed in, and thus there is no need to separate and extract liquid ammonia, which can effectively simplify the recovery process of ammonia fuel and reduce the recovery cost.

[0037] Among them, the pressurization device 7 can adopt an air compressor or a combination of a motor and a piston cylinder. The ammonia fuel is transported into the cylinder body of the piston cylinder, and the piston of the piston cylinder is driven by the motor to pressurize the ammonia fuel to achieve the liquefaction of the ammonia fuel. In this embodiment, the first electromagnetic control valve 9 can adopt a two-position two-way solenoid valve.

[0038] In addition, when the ammonia fuel in the storage tank 5 does not reach the predetermined amount, the first electromagnetic control valve 9 keeps the pressurization pipeline 8 disconnected, and the pressurization device 7 is not turned on.

[0039] Optionally, the fuel supply and recovery system of the ammonia fuel engine further includes a connection pipeline 10 connecting the pressurization device 7 and the liquid ammonia tank 1, and a first one-way valve 11 provided on the connection pipeline 10. The first one-way valve 11 is configured to only allow the ammonia fuel to flow from the pressurization device 7 to the liquid ammonia tank 1. The ammonia fuel pressurized and liquefied by the pressurization device 7 can be transported to the liquid ammonia tank 1 through the connection pipeline 10 to achieve the recycling of ammonia.

[0040] Optionally, the fuel supply and recovery system of the ammonia fuel engine further includes a filter 12 provided on the connection pipeline 10. The filter 12 is located between the first one-way valve 11 and the pressurization device 7. By providing the filter 12, the ammonia fuel can be filtered.

[0041] Optionally, the fuel supply and recovery system of the ammonia fuel engine further includes a second electromagnetic control valve 13 provided on the connection pipeline 10. The second electromagnetic control valve 13 is located between the filter 12 and the pressurization device 7, and the second electromagnetic control valve 13 is used to connect or disconnect the connection pipeline 10. When the pressurization device 7 pressurizes the ammonia fuel, the second electromagnetic control valve 13 can be controlled to disconnect the connection pipeline 10 to prevent the high pressure generated by pressurization from damaging the filter 12. In this embodiment, the second electromagnetic control valve 13 can adopt a two-position two-way solenoid valve.

[0042] Optionally, the fuel supply and recovery system of the ammonia fuel engine further includes a second one-way valve 14 disposed in the recovery pipeline 4. The second one-way valve 14 is located between the recovery pump 6 and the storage tank 5, and the second one-way valve 14 is configured to allow only ammonia fuel to flow from the recovery pump 6 to the storage tank 5. By providing the second one-way valve 14, the ammonia fuel in the storage tank 5 can be prevented from flowing back through the recovery pump 6.

[0043] Optionally, the fuel supply and recovery system of the ammonia fuel engine further includes a bypass pipeline 15 and a third one-way valve 16 disposed in the bypass pipeline 15. The two ends of the bypass pipeline 15 are respectively connected to the supply pipeline 3 and the storage tank 5. The third one-way valve 16 is configured to allow only ammonia fuel to flow from the supply pipeline 3 to the storage tank 5. By providing the bypass pipeline 15, when the ammonia fuel engine is shut down, the recovery pump 6 does not need to be started first. The ammonia fuel in the supply pipeline 3 can be driven by the pressure difference between the pressure in the supply pipeline 3 and the pressure in the storage tank 5 to flow through the third one-way valve 16 to the storage tank 5. When the pressures in the storage tank 5 and the supply pipeline 3 are equal, the recovery pump 6 is then started to save energy. Among them, when the pressures in the storage tank 5 and the supply pipeline 3 are equal, the pressure in the supply pipeline 3 is 3 bar or below, and at this time, the ammonia fuel in the supply pipeline 3 is in a gaseous state.

[0044] Optionally, the supply device includes a first solenoid valve 17, a liquid ammonia pump 18, a second solenoid valve 19, a common rail pipe 20, and a third solenoid valve 21. Along the direction of ammonia fuel transportation in the supply pipeline 3, the first solenoid valve 17, the liquid ammonia pump 18, the second solenoid valve 19, the common rail pipe 20, and the third solenoid valve 21 are sequentially disposed in the supply pipeline 3. Among them, the second solenoid valve 19 is used to connect or disconnect the recovery pipeline 4 from the supply pipeline 3, and both the first solenoid valve 17 and the third solenoid valve 21 are used to connect or disconnect the supply pipeline 3. When the ammonia fuel engine is operating, both the first solenoid valve 17 and the third solenoid valve 21 connect the supply pipeline 3, and the second solenoid valve 19 disconnects the supply pipeline 3 from the recovery pipeline 4. When the ammonia fuel engine is operating, under the drive of the liquid ammonia pump 18, the liquid ammonia in the liquid ammonia tank 1 is pressurized and transported to the common rail pipe 20 for pressure stabilization, and then transported to the injector 2. Among them, exemplarily, the pressure of the liquid ammonia stored in the liquid ammonia tank 1 is 20 bar. After being pressurized by the liquid ammonia pump 18, the pressure of the liquid ammonia can reach 600 bar ± 12 bar. The higher the pressure of the liquid ammonia injected by the injector 2, the more beneficial it is to the atomization of ammonia fuel and can promote the mixing of ammonia fuel and air. In this embodiment, the first solenoid valve 17 and the third solenoid valve 21 can adopt two-position three-way solenoid valves, and the second solenoid valve 19 can adopt two-position two-way solenoid valves.

[0045] Optionally, the fuel supply and recovery system of the ammonia fuel engine further comprises an overflow pipeline 22 and an overflow valve 23 disposed on the overflow pipeline 22. The two ends of the overflow pipeline 22 are respectively connected to the common rail pipe 20 and the storage tank 5. By providing the overflow pipeline 22, when the engine is operating, when the pressure of the liquid ammonia in the common rail pipe 20 exceeds the overflow pressure, the liquid ammonia can be overflowed into the storage tank 5 through the overflow valve 23, so as to prevent the pressure of the liquid ammonia in the common rail pipe 20 and the supply pipeline 3 from exceeding the overflow pressure, playing a protective role.

[0046] Optionally, the fuel supply and recovery system of the ammonia fuel engine further comprises a purge tank 24, a purge pipeline 25, a discharge pipeline 26 and a burner 27. The purge tank 24 is used to store purge gas, and the purge tank 24 is communicated with the purge pipeline 25. The discharge pipeline 26 is communicated with the burner 27. The first solenoid valve 17 is used to connect or disconnect the purge pipeline 25 and the supply pipeline 3. The third solenoid valve 21 is used to connect or disconnect the discharge pipeline 26 and the supply pipeline 3. With such a setting, after the engine stops operating and when the pressures in the supply pipeline 3 and the storage tank 5 are equal, if the recovery pump 6 is abnormal, the first solenoid valve 17 can be controlled to connect the purge pipeline 25 and the supply pipeline 3, and the third solenoid valve 21 can be controlled to connect the supply pipeline 3 and the discharge pipeline 26. The purge gas is output through the purge tank 24 to purge the ammonia fuel in the supply pipeline 3 and other components on the supply pipeline 3 into the burner 27, and a combustion reaction is carried out in the burner 27 to harmlessly treat the ammonia fuel.

[0047] Wherein, the purge gas can be an inert gas, nitrogen, etc. Exemplarily, in this embodiment, the purge gas is specifically nitrogen, and the purge pressure is specifically 6 bar.

[0048] Optionally, the fuel supply and recovery system of the ammonia fuel engine further comprises a pressure reducing valve 28 disposed on the purge pipeline 25. The high-pressure purge gas output from the purge tank 24 can be reduced to the required pressure through the pressure reducing valve 28. In this embodiment, the pressure of the nitrogen stored in the purge tank 24 is specifically 50 bar to ensure that a sufficient amount of nitrogen can be stored in the supply pipeline 3 and can meet the purge requirement for a long time.

[0049] Obviously, the above embodiments of the present utility model are merely examples for clearly explaining the present utility model, and are not limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A fuel supply and recovery system for an ammonia fuel engine, characterized in that, Comprising: A liquid ammonia tank (1) for storing liquid ammonia; An injector (2) for injecting liquid ammonia; A supply pipeline (3) connected between the liquid ammonia tank (1) and the injector (2); A supply device provided on the supply pipeline (3), and the supply device is used to transport the liquid ammonia in the liquid ammonia tank (1) to the injector (2); A recovery pipeline (4) selectively communicated with the supply pipeline (3); A storage tank (5) communicated with the recovery pipeline (4); A recovery pump (6) provided on the recovery pipeline (4), and the recovery pump (6) is used to transport the ammonia fuel in the supply pipeline (3) to the storage tank (5); A pressurizing device (7) communicated with the storage tank (5) through a pressurizing pipeline (8), and the pressurizing device (7) is used to pressurize the ammonia fuel to liquefy the ammonia fuel; A first electromagnetic control valve (9) provided on the pressurizing pipeline (8), and the first electromagnetic control valve (9) is used to connect or disconnect the pressurizing pipeline (8).

2. The fuel supply and recovery system of the ammonia fuel engine according to claim 1, characterized in that, The fuel supply and recovery system of the ammonia fuel engine further includes a connection pipeline (10) connecting the pressurizing device (7) and the liquid ammonia tank (1), and a first one-way valve (11) provided on the connection pipeline (10), and the first one-way valve (11) is configured to only allow the ammonia fuel to flow from the pressurizing device (7) to the liquid ammonia tank (1).

3. The fuel supply and recovery system of the ammonia fuel engine according to claim 2, characterized in that, The fuel supply and recovery system of the ammonia fuel engine further includes a filter (12) provided on the connection pipeline (10), and the filter (12) is located between the first one-way valve (11) and the pressurizing device (7).

4. The fuel supply and recovery system of the ammonia fuel engine according to claim 3, characterized in that, The fuel supply and recovery system of the ammonia fuel engine further includes a second electromagnetic control valve (13) provided on the connection pipeline (10), the second electromagnetic control valve (13) is located between the filter (12) and the pressurizing device (7), and the second electromagnetic control valve (13) is used to connect or disconnect the connection pipeline (10).

5. The fuel supply and recovery system of the ammonia fuel engine according to claim 1, characterized in that, The fuel supply and recovery system of the ammonia fuel engine further includes a second one-way valve (14) provided on the recovery pipeline (4), the second one-way valve (14) is located between the recovery pump (6) and the storage tank (5), and the second one-way valve (14) is configured to only allow the ammonia fuel to flow from the recovery pump (6) to the storage tank (5).

6. The fuel supply and recovery system of the ammonia fuel engine according to claim 1, characterized in that, The fuel supply and recovery system of the ammonia fuel engine further includes a bypass pipeline (15), and a third one-way valve (16) provided on the bypass pipeline (15), both ends of the bypass pipeline (15) are respectively communicated with the supply pipeline (3) and the storage tank (5), and the third one-way valve (16) is configured to only allow the ammonia fuel to flow from the supply pipeline (3) to the storage tank (5).

7. The fuel supply and recovery system of the ammonia fuel engine according to claim 1, characterized in that, The supply device includes a first solenoid valve (17), a liquid ammonia pump (18), a second solenoid valve (19), a common rail pipe (20), and a third solenoid valve (21) that are sequentially arranged on the supply pipeline (3) along the direction of transporting ammonia fuel. The second solenoid valve (19) is used to connect or disconnect the recovery pipeline (4) from the supply pipeline (3). Both the first solenoid valve (17) and the third solenoid valve (21) are used to connect or disconnect the supply pipeline (3).

8. The fuel supply and recovery system of the ammonia fuel engine according to claim 7, characterized in that, The fuel supply and recovery system of the ammonia fuel engine further includes an overflow pipeline (22) and an overflow valve (23 arranged on the overflow pipeline (22). Both ends of the overflow pipeline (22) are respectively connected to the common rail pipe (20) and the storage tank (5).

9. The fuel supply and recovery system of the ammonia fuel engine according to claim 7, characterized in that, The fuel supply and recovery system of the ammonia fuel engine further includes a purge tank (24), a purge pipeline (25), a discharge pipeline (26), and a burner (27). The purge tank (24) is used to store purge gas, and the purge tank (24) is connected to the purge pipeline (25). The discharge pipeline (26) is connected to the burner (27). The first solenoid valve (17) is used to connect or disconnect the purge pipeline (25) from the supply pipeline (3). The third solenoid valve (21) is used to connect or disconnect the discharge pipeline (26) from the supply pipeline (3).

10. The fuel supply and recovery system of the ammonia fuel engine according to claim 9, characterized in that, The fuel supply and recovery system of the ammonia fuel engine further includes a pressure reducing valve (28) arranged on the purge pipeline (25).

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