Ship ammonia vapor treatment system and ship

Abstract

A ship ammonia vapor treatment system comprises a liquid ammonia storage tank, a liquid ammonia pump, a liquid ammonia supercooling system and a first throttling valve, and a spraying device is arranged at the top in the liquid ammonia storage tank; the liquid ammonia pump is arranged in the liquid ammonia storage tank, an outlet of the liquid ammonia pump is connected with a liquid ammonia inlet of the liquid ammonia supercooling system, a liquid ammonia outlet of the liquid ammonia supercooling system is connected with an inlet of the first throttling valve, and an outlet of the first throttling valve is connected with the spraying device. According to the ship ammonia vapor treatment system, the ammonia vapor in the liquid ammonia storage tank can be subjected to reliquefaction treatment, so that the ammonia vapor is reused, and the waste of fuel is reduced. The utility model further provides a ship.

Description

Technical Field

[0001] The utility model relates to the technical field of ships, in particular to a ship ammonia vapor treatment system and a ship. Background Art

[0002] As the problem of global warming intensifies, reducing greenhouse gas emissions has become one of the important tasks facing the world today. Increasing the proportion of zero-carbon or low-carbon energy in the world's energy consumption structure will help reduce greenhouse gas emissions and promote the realization of "carbon neutrality" in the global carbon cycle system. In the field of shipping, ammonia as a zero-carbon fuel has attracted widespread attention. As a ship engine fuel, ammonia is usually stored in fuel tanks in the form of liquid ammonia at -33°C. During the storage process, due to heat leakage from the environment, the liquid ammonia in the fuel tank will inevitably absorb heat and evaporate. The accumulation of ammonia vapor (boiled gas, or BOG) produced by evaporation will cause the tank pressure to increase, which is easy to cause safety accidents. Therefore, the ammonia vapor in the fuel tank needs to be treated.

[0003] At present, ammonia vapor treatment mostly adopts the method of direct absorption by an ammonia treatment device (for example, using water to absorb ammonia to form ammonia water), which will lead to fuel waste. Utility Model Content

[0004] The utility model aims to provide a ship ammonia vapor processing system, which can reliquefy the ammonia vapor in the liquid ammonia storage tank so that the ammonia vapor can be reused, thereby reducing the waste of fuel.

[0005] The utility model provides a ship ammonia vapor treatment system, comprising a liquid ammonia storage tank, a liquid ammonia pump, a liquid ammonia supercooling system and a first throttle valve, wherein a spray device is provided on the top of the liquid ammonia storage tank; the liquid ammonia pump is arranged in the liquid ammonia storage tank, the outlet of the liquid ammonia pump is connected to the liquid ammonia inlet of the liquid ammonia supercooling system, the liquid ammonia outlet of the liquid ammonia supercooling system is connected to the inlet of the first throttle valve, and the outlet of the first throttle valve is connected to the spray device;

[0006] The liquid ammonia pump is used to transport the liquid ammonia in the liquid ammonia storage tank to the liquid ammonia supercooling system, the liquid ammonia supercooling system is used to cool the liquid ammonia, and the first throttle valve is used to throttle and cool the liquid ammonia; the spraying device is used to spray the cooled liquid ammonia into the liquid ammonia storage tank so that the ammonia vapor in the liquid ammonia storage tank is condensed and liquefied into liquid ammonia.

[0007] Furthermore, the liquid ammonia supercooling system includes a liquid ammonia supercooler and a condensing system, the outlet of the liquid ammonia pump is connected to the liquid ammonia inlet of the liquid ammonia supercooler, and the liquid ammonia outlet of the liquid ammonia supercooler is connected to the inlet of the first throttle valve; the condensing system is connected to the liquid ammonia supercooler, and the cooling fluid in the condensing system can flow through the liquid ammonia supercooler to cool the liquid ammonia in the liquid ammonia supercooler.

[0008] Furthermore, the condensing system includes a refrigeration compressor, a condenser and a second throttle valve, the outlet of the refrigeration compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the second throttle valve, the outlet of the second throttle valve is connected to the refrigerant inlet of the liquid ammonia subcooler, and the refrigerant outlet of the liquid ammonia subcooler is connected to the inlet of the refrigeration compressor; the refrigerant can circulate among the refrigeration compressor, the condenser, the second throttle valve and the liquid ammonia subcooler.

[0009] Furthermore, the internal space of the liquid ammonia storage tank is divided into a gas phase space and a liquid phase space, the gas phase space is located above the liquid phase space, the spray device is arranged in the gas phase space, and the liquid ammonia pump is arranged in the liquid phase space.

[0010] Furthermore, the spray device includes a spray pipe and a plurality of spray heads arranged on the spray pipe, and the outlet of the first throttle valve is connected to the spray pipe.

[0011] Furthermore, a temperature sensor and a pressure sensor are provided on the liquid ammonia storage tank, and the ship ammonia vapor treatment system also includes a control module, which is electrically connected to the temperature sensor, the pressure sensor, the liquid ammonia pump and the liquid ammonia supercooling system respectively, and the control module is used to control the opening and closing of the liquid ammonia pump and the liquid ammonia supercooling system according to the temperature value detected by the temperature sensor and the pressure value detected by the pressure sensor.

[0012] Furthermore, the ship ammonia vapor treatment system also includes a ventilation mast, which is connected to the top outlet of the liquid ammonia storage tank, and a non-condensable gas discharge valve is provided on the pipeline between the ventilation mast and the top outlet of the liquid ammonia storage tank.

[0013] Furthermore, the liquid ammonia storage tank is provided with a temperature sensor and a pressure sensor, and the ship ammonia vapor treatment system also includes a control module, which is electrically connected to the temperature sensor, the pressure sensor and the non-condensable gas discharge valve respectively, and the control module is used to control the opening and closing of the non-condensable gas discharge valve according to the temperature value detected by the temperature sensor and the pressure value detected by the pressure sensor.

[0014] Furthermore, an ammonia absorption device is provided between the ventilation mast and the top outlet of the liquid ammonia storage tank.

[0015] The utility model also provides a ship, comprising the ship ammonia vapor treatment system mentioned above.

[0016] The ship ammonia vapor treatment system provided by the utility model is provided with a liquid ammonia pump, a liquid ammonia supercooling system and a first throttle valve, and a spray device is provided on the top of the liquid ammonia storage tank. The liquid ammonia in the liquid ammonia storage tank is first transported to the liquid ammonia supercooling system by the liquid ammonia pump, and then the liquid ammonia supercooling system is used to cool the liquid ammonia to make the liquid ammonia become supercooled liquid ammonia, and then the first throttle valve is used to further throttle and cool the liquid ammonia. The supercooled liquid ammonia can be sprayed on the ammonia vapor accumulated in the liquid ammonia storage tank through the spray device, so that the ammonia vapor in the liquid ammonia storage tank is condensed and liquefied to be converted into liquid ammonia stored in the liquid ammonia storage tank, thereby reducing fuel waste, preventing the liquid ammonia storage tank from overheating and overpressure, and ensuring the operation safety of the liquid ammonia storage tank. At the same time, the ship ammonia vapor treatment system has a simple structure, and the equipment cost and operation cost are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a ship ammonia vapor treatment system in an embodiment of the utility model.

[0018] Figure 2 Schematic diagram of control logic of the control module in the embodiment of the utility model.

[0019] Figure 3 This is a schematic structural diagram of a ship ammonia vapor treatment system in another embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0022] The directional words such as up, down, left, right, front, back, top, bottom, etc. (if any) involved in the specification and claims of the utility model are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, and are only for the clarity and convenience of expressing the technical solution. It should be understood that the use of directional words should not limit the scope of protection requested by this application.

[0023] like Figure 1As shown, the marine ammonia vapor treatment system provided by the embodiment of the utility model comprises a liquid ammonia storage tank 1, a liquid ammonia pump 2, a liquid ammonia supercooling system 3 and a first throttle valve 4, and a spray device 5 is provided on the top of the liquid ammonia storage tank 1. The liquid ammonia pump 2 is arranged in the liquid ammonia storage tank 1, the outlet of the liquid ammonia pump 2 is connected to the liquid ammonia inlet of the liquid ammonia supercooling system 3, the liquid ammonia outlet of the liquid ammonia supercooling system 3 is connected to the inlet of the first throttle valve 4, and the outlet of the first throttle valve 4 is connected to the spray device 5.

[0024] Among them, the liquid ammonia storage tank 1 is used to store liquid ammonia; the liquid ammonia pump 2 is used to transport the liquid ammonia in the liquid ammonia storage tank 1 to the liquid ammonia supercooling system 3, and the liquid ammonia supercooling system 3 is used to cool the liquid ammonia to convert the liquid ammonia into supercooled liquid ammonia (that is, the temperature of the liquid ammonia after being treated by the liquid ammonia supercooling system 3 is lower than the temperature of the liquid ammonia in the liquid ammonia storage tank 1); the first throttle valve 4 is used to throttle and cool the liquid ammonia (the first throttle valve 4 expands, decompresses and cools the liquid ammonia) to further reduce the temperature of the liquid ammonia; the spray device 5 is used to spray the cooled liquid ammonia into the liquid ammonia storage tank 1, so that the ammonia vapor (that is, BOG, Boil-Off Gas) in the liquid ammonia storage tank 1 is condensed and liquefied into liquid ammonia.

[0025] The ship ammonia vapor treatment system provided by the utility model is provided with a liquid ammonia pump 2, a liquid ammonia supercooling system 3 and a first throttle valve 4, and a spray device 5 is provided on the top of the liquid ammonia storage tank 1. The liquid ammonia pump 2 is first used to transport the liquid ammonia in the liquid ammonia storage tank 1 to the liquid ammonia supercooling system 3, and then the liquid ammonia supercooling system 3 is used to cool the liquid ammonia to make the liquid ammonia become supercooled liquid ammonia, and then the first throttle valve 4 is used to further throttle and cool the liquid ammonia. The supercooled liquid ammonia can be sprayed on the ammonia vapor accumulated in the liquid ammonia storage tank 1 through the spray device 5, so that the ammonia vapor in the liquid ammonia storage tank 1 is condensed and liquefied to become liquid ammonia stored in the liquid ammonia storage tank 1 again, thereby reducing fuel waste, preventing the liquid ammonia storage tank 1 from overheating and overpressure, and ensuring the operation safety of the liquid ammonia storage tank 1. At the same time, the ship ammonia vapor treatment system has a simple structure, and low equipment cost and operation cost.

[0026] Furthermore, if Figure 1 As shown, in this embodiment, the liquid ammonia supercooling system 3 includes a liquid ammonia supercooler 31 and a condensing system 32. The outlet of the liquid ammonia pump 2 is connected to the liquid ammonia inlet of the liquid ammonia supercooler 31, and the liquid ammonia outlet of the liquid ammonia supercooler 31 is connected to the inlet of the first throttle valve 4. The condensing system 32 is connected to the liquid ammonia supercooler 31, and the cooling fluid in the condensing system 32 can flow through the liquid ammonia supercooler 31 to cool the liquid ammonia in the liquid ammonia supercooler 31.

[0027] Furthermore, if Figure 1As shown, in this embodiment, the condensing system 32 is a refrigerant cooling system, and the condensing system 32 includes a refrigeration compressor 321, a condenser 322 and a second throttle valve 323. The outlet of the refrigeration compressor 321 is connected to the inlet of the condenser 322, the outlet of the condenser 322 is connected to the inlet of the second throttle valve 323, the outlet of the second throttle valve 323 is connected to the refrigerant inlet of the liquid ammonia subcooler 31, and the refrigerant outlet of the liquid ammonia subcooler 31 is connected to the inlet of the refrigeration compressor 321. The refrigerant (that is, the cooling fluid is the refrigerant) can circulate between the refrigeration compressor 321, the condenser 322, the second throttle valve 323 and the liquid ammonia subcooler 31.

[0028] Specifically, after the low-temperature liquid refrigerant exchanges heat with the liquid ammonia in the liquid ammonia supercooler 31 in the liquid ammonia supercooler 31, the liquid ammonia in the liquid ammonia supercooler 31 is further cooled, and at the same time, the refrigerant absorbs heat and evaporates into a gaseous state; the gaseous refrigerant enters the refrigeration compressor 321, and the refrigeration compressor 321 compresses the gaseous refrigerant to a high-temperature and high-pressure state, and then the gaseous refrigerant in the high-temperature and high-pressure state enters the condenser 322 to cool and condense into a liquid refrigerant, and the liquid refrigerant expands and reduces pressure and temperature through the second throttle valve 323, and enters the liquid ammonia supercooler 31 again to exchange heat with the liquid ammonia in the liquid ammonia supercooler 31, completing the refrigerant cycle. The condenser 322 can use cooling water as a cold source, and the cooling water can be seawater or low-temperature fresh water.

[0029] Among them, the refrigerant can be R507A refrigerant, R448A refrigerant, etc. The condensation temperature and vaporization temperature of this type of refrigerant are greatly different (that is, the working range is wider). It can directly absorb heat from the low-temperature liquid ammonia in the liquid ammonia supercooler 31 and release heat in the cooling water in the condenser 322, thereby achieving a good heat exchange effect and improving the cooling efficiency.

[0030] Furthermore, if Figure 1 As shown, in this embodiment, a heat exchange tube 311 is provided in the liquid ammonia subcooler 31, the refrigerant inlet of the heat exchange tube 311 is connected to the outlet of the second throttle valve 323, and the refrigerant outlet of the heat exchange tube 311 is connected to the inlet of the refrigeration compressor 321; the refrigerant can circulate between the refrigeration compressor 321, the condenser 322, the second throttle valve 323 and the heat exchange tube 311.

[0031] Furthermore, if Figure 1As shown, in this embodiment, the internal space of the liquid ammonia storage tank 1 is divided into a gas phase space 10A and a liquid phase space 10B, the gas phase space 10A is located above the liquid phase space 10B, the liquid ammonia in the liquid ammonia storage tank 1 is stored in the liquid phase space 10B, and the ammonia vapor in the liquid ammonia storage tank 1 is concentrated in the gas phase space 10A. The spray device 5 is arranged in the gas phase space 10A, so that the ammonia vapor in the gas phase space 10A can be sprayed; the liquid ammonia pump 2 is arranged in the liquid phase space 10B, so that the liquid ammonia in the liquid phase space 10B can be sucked.

[0032] Furthermore, if Figure 1 As shown, in this embodiment, the spray device 5 includes a spray pipe 51 and a plurality of spray heads 52 disposed on the spray pipe 51, the plurality of spray heads 52 are disposed at intervals on the spray pipe 51, and the outlet of the first throttle valve 4 is connected to the spray pipe 51, so that the supercooled liquid ammonia can be uniformly sprayed through the spray pipe 51 through the plurality of spray heads 52, thereby improving the reliquefaction efficiency of ammonia vapor. Of course, in other embodiments, the spray device 5 can also be other structures.

[0033] Furthermore, if Figure 1 and Figure 2 As shown, in this embodiment, a temperature sensor 11 and a pressure sensor 12 are provided on the liquid ammonia storage tank 1, and the temperature sensor 11 and the pressure sensor 12 are used to detect the temperature and pressure in the liquid ammonia storage tank 1 respectively (specifically, the temperature sensor 11 and the pressure sensor 12 generally detect the temperature and pressure of the gas phase space 10A in the liquid ammonia storage tank 1 respectively). The ship ammonia vapor treatment system also includes a control module 7, which can be a PLC control device. The control module 7 is electrically connected to the temperature sensor 11, the pressure sensor 12, the liquid ammonia pump 2 and the liquid ammonia supercooling system 3 (specifically, the control module 7 is electrically connected to the refrigeration compressor 321 in the liquid ammonia supercooling system 3 to control its opening and closing), and the control module 7 is used to control the opening and closing of the liquid ammonia pump 2 and the liquid ammonia supercooling system 3 according to the temperature value detected by the temperature sensor 11 and the pressure value detected by the pressure sensor 12.

[0034] Specifically, when the temperature value detected by the temperature sensor 11 and / or the pressure value detected by the pressure sensor 12 exceeds the upper limit of the preset safety range, it indicates that the liquid ammonia storage tank 1 is at risk of over-temperature and over-pressure; at this time, the control module 7 controls the liquid ammonia pump 2 and the liquid ammonia supercooling system 3 to turn on, thereby spraying and condensing the ammonia vapor in the liquid ammonia storage tank 1, and then cooling and reducing the pressure of the liquid ammonia storage tank 1; when the temperature value detected by the temperature sensor 11 and the pressure value detected by the pressure sensor 12 are lower than the lower limit of the preset safety range, the control module 7 controls the liquid ammonia pump 2 and the liquid ammonia supercooling system 3 to turn off.

[0035] Furthermore, if Figure 1As shown, in this embodiment, the ship ammonia vapor treatment system also includes a ventilation mast 6, which is connected to the top outlet of the liquid ammonia storage tank 1, and a non-condensable gas discharge valve 61 is provided on the pipeline between the ventilation mast 6 and the top outlet of the liquid ammonia storage tank 1.

[0036] Specifically, there will be some impurity gases in the liquid ammonia storage tank 1 (such as nitrogen, which generally remain in the liquid ammonia storage tank 1 when the liquid ammonia storage tank 1 is purged with nitrogen, filled with liquid ammonia, etc.), and the condensation temperature of these impurity gases is lower than the temperature of liquid ammonia (for example, the condensation temperature of nitrogen is -196°C, and the storage temperature of liquid ammonia is generally around -33°C), so these impurity gases will always exist in the liquid ammonia storage tank 1 in a gaseous state, that is, form non-condensable gases, and mix with the ammonia vapor in the liquid ammonia storage tank 1; if these non-condensable gases are not discharged, they will continue to circulate with the ammonia vapor, causing overpressure in the liquid ammonia storage tank 1, increasing the processing burden of the ship's ammonia vapor treatment system, and reducing the efficiency of reliquefaction.

[0037] Therefore, in this embodiment, by setting a vent mast 6 and a non-condensable gas discharge valve 61, when the temperature and / or pressure in the liquid ammonia storage tank 1 drops to a certain value, it means that most of the ammonia vapor in the liquid ammonia storage tank 1 has been condensed and liquefied into liquid ammonia, and at this time, most of the gas in the gas phase space 10A in the liquid ammonia storage tank 1 is non-condensable gas; then open the non-condensable gas discharge valve 61 to discharge the non-condensable gas in the non-condensable gas discharge valve 61 through the vent mast 6, thereby improving the reliquefaction processing efficiency of the system.

[0038] Furthermore, if Figure 1 and Figure 2 As shown, in this embodiment, the non-condensable gas discharge valve 61 is an electrically controlled valve, and the control module 7 is electrically connected to the temperature sensor 11, the pressure sensor 12 and the non-condensable gas discharge valve 61, respectively. The control module 7 is used to control the opening and closing of the non-condensable gas discharge valve 61 according to the temperature value detected by the temperature sensor 11 and the pressure value detected by the pressure sensor 12. Specifically, when the temperature value detected by the temperature sensor 11 and the pressure value detected by the pressure sensor 12 are lower than a certain value (for example, the above-mentioned lower limit of the preset safety range), the control module 7 controls the non-condensable gas discharge valve 61 to open; after the non-condensable gas is discharged, the control module 7 controls the non-condensable gas discharge valve 61 to close.

[0039] Furthermore, if Figure 3As shown, in another embodiment, an ammonia absorption device 8 is provided between the vent mast 6 and the top outlet of the liquid ammonia storage tank 1 (specifically, the ammonia absorption device 8 is provided between the non-condensable gas discharge valve 61 and the vent mast 6), and the ammonia absorption device 8 is used to further absorb a small amount of ammonia mixed in the non-condensable gas to reduce the emission of ammonia or achieve zero emission of ammonia. The ammonia absorption device 8 can be specifically a bubbling absorption device (specifically, water can be placed in a container, and the non-condensable gas mixed with ammonia is passed into the water to absorb and separate the ammonia).

[0040] Furthermore, if Figure 1 As shown, in this embodiment, the main working process of the ship ammonia vapor treatment system is as follows:

[0041] Ammonia vapor in the liquid ammonia storage tank 1 is concentrated in the gas phase space 10A at the top of the liquid ammonia storage tank 1. The liquid ammonia from the liquid ammonia storage tank 1 is pressurized by the liquid ammonia pump 2 and then transported to the liquid ammonia supercooler 31. The condensation system 32 cools the liquid ammonia in the liquid ammonia supercooler 31 (the temperature of the liquid ammonia at the inlet of the liquid ammonia supercooler 31 is about -30°C, and the temperature of the liquid ammonia at the outlet of the liquid ammonia supercooler 31 is about -40°C); then the first throttle valve 4 expands and decompresses the liquid ammonia to cool it, and the cooled liquid ammonia is sprayed into the liquid ammonia storage tank 1 through the spray device 5, so that the ammonia vapor in the liquid ammonia storage tank 1 is condensed and liquefied into liquid ammonia, so as to reduce the temperature and pressure in the liquid ammonia storage tank 1. When the temperature and / or pressure in the liquid ammonia storage tank 1 is reduced to a certain value, the non-condensable gas discharge valve 61 is opened, and the non-condensable gas in the non-condensable gas discharge valve 61 is discharged through the vent mast 6, thereby improving the reliquefaction processing efficiency of the system.

[0042] An embodiment of the utility model further provides a ship, in particular an ammonia fuel ship, comprising the ship ammonia vapor treatment system described above.

[0043] The ship ammonia vapor treatment system provided by the embodiment of the utility model is provided with a liquid ammonia pump 2, a liquid ammonia supercooling system 3 and a first throttle valve 4, and a spray device 5 is provided at the top of the liquid ammonia storage tank 1. The liquid ammonia pump 2 is first used to transport the liquid ammonia in the liquid ammonia storage tank 1 to the liquid ammonia supercooling system 3, and then the liquid ammonia supercooling system 3 is used to cool the liquid ammonia to make the liquid ammonia become supercooled liquid ammonia, and then the first throttle valve 4 is used to further throttle and cool the liquid ammonia. The supercooled liquid ammonia can be sprayed on the ammonia vapor accumulated in the liquid ammonia storage tank 1 through the spray device 5, so that the ammonia vapor in the liquid ammonia storage tank 1 is condensed and liquefied to become liquid ammonia stored in the liquid ammonia storage tank 1 again, thereby reducing fuel waste, preventing the liquid ammonia storage tank 1 from overheating and overpressure, and ensuring the operation safety of the liquid ammonia storage tank 1. At the same time, the ship ammonia vapor treatment system has a simple structure, and low equipment cost and operation cost.

[0044] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A ship ammonia vapor treatment system, characterized in that: The invention comprises a liquid ammonia storage tank (1), a liquid ammonia pump (2), a liquid ammonia supercooling system (3) and a first throttle valve (4); a spray device (5) is provided on the top of the liquid ammonia storage tank (1); the liquid ammonia pump (2) is arranged in the liquid ammonia storage tank (1); the outlet of the liquid ammonia pump (2) is connected to the liquid ammonia inlet of the liquid ammonia supercooling system (3); the liquid ammonia outlet of the liquid ammonia supercooling system (3) is connected to the inlet of the first throttle valve (4); and the outlet of the first throttle valve (4) is connected to the spray device (5); The liquid ammonia pump (2) is used to transport the liquid ammonia in the liquid ammonia storage tank (1) to the liquid ammonia supercooling system (3); the liquid ammonia supercooling system (3) is used to cool the liquid ammonia; the first throttle valve (4) is used to throttle and cool the liquid ammonia; the spray device (5) is used to spray the cooled liquid ammonia into the liquid ammonia storage tank (1), so that the ammonia vapor in the liquid ammonia storage tank (1) is condensed and liquefied into liquid ammonia.

2. The ship ammonia vapor treatment system according to claim 1, characterized in that: The liquid ammonia supercooling system (3) comprises a liquid ammonia supercooler (31) and a condensing system (32); the outlet of the liquid ammonia pump (2) is connected to the liquid ammonia inlet of the liquid ammonia supercooler (31); the liquid ammonia outlet of the liquid ammonia supercooler (31) is connected to the inlet of the first throttle valve (4); the condensing system (32) is connected to the liquid ammonia supercooler (31); the cooling fluid in the condensing system (32) can flow through the liquid ammonia supercooler (31) to cool the liquid ammonia in the liquid ammonia supercooler (31).

3. The ship ammonia vapor treatment system according to claim 2, characterized in that: The condensation system (32) comprises a refrigeration compressor (321), a condenser (322) and a second throttle valve (323); the outlet of the refrigeration compressor (321) is connected to the inlet of the condenser (322); the outlet of the condenser (322) is connected to the inlet of the second throttle valve (323); the outlet of the second throttle valve (323) is connected to the refrigerant inlet of the liquid ammonia subcooler (31); and the refrigerant outlet of the liquid ammonia subcooler (31) is connected to the inlet of the refrigeration compressor (321); the refrigerant can circulate between the refrigeration compressor (321), the condenser (322), the second throttle valve (323) and the liquid ammonia subcooler (31).

4. The ship ammonia vapor treatment system according to claim 1, characterized in that: The internal space of the liquid ammonia storage tank (1) is divided into a gas phase space (10A) and a liquid phase space (10B), the gas phase space (10A) is located above the liquid phase space (10B), the spray device (5) is arranged in the gas phase space (10A), and the liquid ammonia pump (2) is arranged in the liquid phase space (10B).

5. The ship ammonia vapor treatment system according to claim 1, characterized in that: The spray device (5) comprises a spray pipe (51) and a plurality of spray heads (52) arranged on the spray pipe (51); the outlet of the first throttle valve (4) is connected to the spray pipe (51).

6. The ship ammonia vapor treatment system according to claim 1, characterized in that: The liquid ammonia storage tank (1) is provided with a temperature sensor (11) and a pressure sensor (12). The ship ammonia vapor treatment system further comprises a control module (7). The control module (7) is respectively connected to the temperature sensor (11), the pressure sensor (12), the liquid ammonia pump (2) and the liquid ammonia supercooling system (3) by electrical signals. The control module (7) is used to control the opening and closing of the liquid ammonia pump (2) and the liquid ammonia supercooling system (3) according to the temperature value detected by the temperature sensor (11) and the pressure value detected by the pressure sensor (12).

7. The ship ammonia vapor treatment system according to any one of claims 1 to 6, characterized in that: The ship ammonia vapor treatment system also includes a ventilation mast (6), the ventilation mast (6) is connected to the top outlet of the liquid ammonia storage tank (1), and a non-condensable gas discharge valve (61) is provided on the pipeline between the ventilation mast (6) and the top outlet of the liquid ammonia storage tank (1).

8. The ship ammonia vapor treatment system according to claim 7, characterized in that: The liquid ammonia storage tank (1) is provided with a temperature sensor (11) and a pressure sensor (12), and the ship ammonia vapor treatment system further comprises a control module (7), the control module (7) being respectively connected to the temperature sensor (11), the pressure sensor (12) and the non-condensable gas discharge valve (61) by electrical signals, and the control module (7) being used to control the opening and closing of the non-condensable gas discharge valve (61) according to the temperature value detected by the temperature sensor (11) and the pressure value detected by the pressure sensor (12).

9. The ship ammonia vapor treatment system according to claim 7, characterized in that: An ammonia absorption device (8) is provided between the ventilation mast (6) and the top outlet of the liquid ammonia storage tank (1).

10. A ship, characterized in that: The invention comprises a ship ammonia vapor treatment system as claimed in any one of claims 1 to 9.

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