Ship ammonia vapor treatment system and ship

Abstract

A ship ammonia vapor treatment system comprises a liquid ammonia storage tank, a BOG compressor, an ammonia gas liquefier, a liquid ammonia pump and a liquid ammonia / ammonia gas mixer, a BOG outlet of the liquid ammonia storage tank is connected with an inlet of the BOG compressor, an outlet of the BOG compressor is connected with an ammonia gas inlet of the ammonia gas liquefier, and a liquid ammonia outlet of the ammonia gas liquefier is connected with an inlet of the liquid ammonia / ammonia gas mixer; the liquid ammonia pump is arranged in the liquid ammonia storage tank, an outlet of the liquid ammonia pump is connected with an inlet of the liquid ammonia / ammonia gas mixer, and a liquid ammonia outlet of the liquid ammonia / ammonia gas mixer is used for being connected to an ammonia fuel engine. 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 BOG compressor, an ammonia liquefier, a liquid ammonia pump and a liquid ammonia / ammonia gas mixer, wherein the BOG outlet of the liquid ammonia storage tank is connected to the inlet of the BOG compressor, the outlet of the BOG compressor is connected to the ammonia inlet of the ammonia liquefier, the liquid ammonia outlet of the ammonia liquefier is connected to the inlet of the liquid ammonia / ammonia gas mixer; the liquid ammonia pump is arranged in the liquid ammonia storage tank, the outlet of the liquid ammonia pump is connected to the inlet of the liquid ammonia / ammonia gas mixer, and the liquid ammonia outlet of the liquid ammonia / ammonia gas mixer is used to be connected to an ammonia fuel engine.

[0006] Furthermore, a throttle valve is provided on the pipeline between the liquid ammonia outlet of the ammonia liquefier and the inlet of the liquid ammonia / ammonia mixer.

[0007] Furthermore, the ship ammonia vapor treatment system also includes a booster pump, the inlet of the booster pump is connected to the liquid ammonia outlet of the liquid ammonia / ammonia gas mixer, and the outlet of the booster pump is used to be connected to the ammonia fuel engine.

[0008] Furthermore, the ship ammonia vapor processing system also includes a cooling system, which is connected to the ammonia liquefier, and the cooling fluid in the cooling system can flow through the ammonia liquefier to cool the ammonia vapor in the ammonia liquefier.

[0009] Furthermore, the cooling system is a water cooling system, and the cooling water in the water cooling system can flow through the ammonia liquefier.

[0010] Furthermore, the ship ammonia vapor treatment system also includes a ventilation mast, which is connected to the top outlet of the liquid ammonia / ammonia gas mixer, and a non-condensable gas discharge valve is provided on the pipeline between the ventilation mast and the top outlet of the liquid ammonia / ammonia gas mixer.

[0011] Furthermore, a pressure sensor is provided on the liquid ammonia / ammonia gas mixer, and the ship ammonia vapor treatment system also includes a control module, which is electrically connected to the pressure sensor and the non-condensable gas discharge valve by signals, respectively, and is used to control the opening and closing of the non-condensable gas discharge valve according to the pressure value detected by the pressure sensor.

[0012] Furthermore, an ammonia absorption device is provided between the ventilation mast and the top outlet of the liquid ammonia / ammonia gas mixer.

[0013] The utility model also provides a ship, comprising the ship ammonia vapor treatment system mentioned above.

[0014] The marine ammonia vapor processing system provided by the utility model is provided with a BOG compressor, an ammonia liquefier, a liquid ammonia pump and a liquid ammonia / ammonia gas mixer. The BOG compressor is used to compress the ammonia vapor from the liquid ammonia storage tank, and then the ammonia liquefier is used to cool the ammonia vapor so that the ammonia vapor is condensed and liquefied into liquid ammonia. The liquid ammonia condensed by the ammonia liquefier and the liquid ammonia output by the liquid ammonia pump can be transported to the liquid ammonia / ammonia gas mixer and mixed, so that the ammonia vapor mixed in the liquid ammonia from the ammonia liquefier can be further condensed and liquefied, thereby increasing the re-liquefaction ratio of the ammonia vapor. The liquid ammonia mixed in the liquid ammonia / ammonia gas mixer is then supplied to the ammonia fuel engine as a fuel supply source.

[0015] At the same time, the liquid ammonia / ammonia gas mixer can also play a role of buffering and gas-liquid separation. The condensed liquid ammonia and unliquefied ammonia vapor can be separated into gas and liquid in the liquid ammonia / ammonia gas mixer. On the one hand, it can ensure that pure liquid ammonia is supplied to the ammonia fuel engine. On the other hand, when the amount of gas in the liquid ammonia / ammonia gas mixer gradually increases, the pressure in the liquid ammonia / ammonia gas mixer gradually increases, which can further liquefy the ammonia vapor in the liquid ammonia / ammonia gas mixer, thereby increasing the liquefaction ratio of the ammonia vapor. The ship's ammonia vapor treatment system reliquefies the ammonia vapor in the liquid ammonia storage tank and supplies it as fuel, which not only reduces fuel waste, prevents over-temperature and over-pressure of the liquid ammonia storage tank, and ensures the operating safety of the liquid ammonia storage tank, but also reduces the processing volume and processing time of the BOG compressor and the ammonia liquefier, and reduces operating energy consumption because the treated liquid ammonia will not return to the liquid ammonia storage tank. At the same time, since the ammonia vapor after cooling and condensing in the ammonia liquefier can be further condensed and liquefied in the liquid ammonia / ammonia mixer, that is, the low-temperature liquid ammonia in the liquid ammonia storage tank is used as the cooling medium for ammonia vapor, the utilization rate of cold energy is improved, which can further reduce operating energy consumption and operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a ship ammonia vapor treatment system in an embodiment of the utility model.

[0017] Figure 2 Schematic diagram of control logic of the control module in the embodiment of the utility model.

[0018] Figure 3 This is a schematic structural diagram of a ship ammonia vapor treatment system in another embodiment of the present invention. DETAILED DESCRIPTION

[0019] 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.

[0020] The terms "first", "second", "third", "fourth" and the like (if any) in the description and claims of the present utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0021] 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.

[0022] like Figure 1As shown, the marine ammonia vapor processing system provided by the embodiment of the utility model comprises a liquid ammonia storage tank 1, a BOG (i.e., ammonia vapor, Boil-Off Gas) compressor 2, an ammonia liquefier 3, a liquid ammonia pump 4, and a liquid ammonia / ammonia gas mixer 5. The BOG outlet of the liquid ammonia storage tank 1 is connected to the inlet of the BOG compressor 2, the outlet of the BOG compressor 2 is connected to the ammonia inlet of the ammonia liquefier 3, and the liquid ammonia outlet of the ammonia liquefier 3 is connected to the inlet of the liquid ammonia / ammonia gas mixer 5. The liquid ammonia pump 4 is arranged in the liquid ammonia storage tank 1, the outlet of the liquid ammonia pump 4 is connected to the inlet of the liquid ammonia / ammonia gas mixer 5, and the liquid ammonia outlet of the liquid ammonia / ammonia gas mixer 5 is used to be connected to an ammonia fuel engine (not shown), so as to supply fuel to the ammonia fuel engine.

[0023] Among them, the liquid ammonia storage tank 1 is used to store liquid ammonia; the BOG compressor 2 is used to compress the ammonia vapor output from the liquid ammonia storage tank 1; the ammonia liquefier 3 is used to cool the compressed ammonia vapor to condense the ammonia vapor into liquid ammonia, and the condensed liquid ammonia and uncondensed ammonia vapor enter the liquid ammonia / ammonia gas mixer 5; the liquid ammonia pump 4 is used to transport the liquid ammonia in the liquid ammonia storage tank 1 to the liquid ammonia / ammonia gas mixer 5, and the low-temperature liquid ammonia from the liquid ammonia storage tank 1 and the liquid ammonia and ammonia vapor from the ammonia liquefier 3 are mixed in the liquid ammonia / ammonia gas mixer 5 and supplied as fuel.

[0024] The marine ammonia vapor treatment system provided by the embodiment of the utility model is provided with a BOG compressor 2, an ammonia liquefier 3, a liquid ammonia pump 4 and a liquid ammonia / ammonia gas mixer 5. The BOG compressor 2 is used to compress the ammonia vapor from the liquid ammonia storage tank 1, and then the ammonia liquefier 3 is used to cool the ammonia vapor to condense and liquefy the ammonia vapor into liquid ammonia. The liquid ammonia condensed by the ammonia liquefier 3 and the liquid ammonia output by the liquid ammonia pump 4 can be transported to the liquid ammonia / ammonia gas mixer 5 and mixed, so that the ammonia vapor mixed in the liquid ammonia from the ammonia liquefier 3 can be further condensed and liquefied (limited by the heat exchange efficiency of the ammonia liquefier 3, a small amount of ammonia vapor in the ammonia liquefier 3 is not completely liquefied), thereby increasing the proportion of ammonia vapor re-liquefaction; the liquid ammonia mixed in the liquid ammonia / ammonia gas mixer 5 is then supplied to the ammonia fuel engine as a fuel supply source.

[0025] At the same time, the liquid ammonia / ammonia gas mixer 5 can also play a role of buffering and gas-liquid separation. The condensed liquid ammonia and the unliquefied ammonia vapor can be separated into gas and liquid in the liquid ammonia / ammonia gas mixer 5. On the one hand, it can ensure that pure liquid ammonia is supplied to the ammonia fuel engine. On the other hand, when the amount of gas in the liquid ammonia / ammonia gas mixer 5 (the gas includes unliquefied ammonia vapor and the non-condensable gas described below) gradually increases, the pressure in the liquid ammonia / ammonia gas mixer 5 gradually increases, which can further liquefy the ammonia vapor in the liquid ammonia / ammonia gas mixer 5, thereby increasing the liquefaction ratio of the ammonia vapor. The ship ammonia vapor treatment system reliquefies the ammonia vapor in the liquid ammonia storage tank 1 and supplies it as fuel, which not only reduces fuel waste, prevents the liquid ammonia storage tank 1 from overheating and overpressure, and ensures the operating safety of the liquid ammonia storage tank 1, but also because the treated liquid ammonia will not return to the liquid ammonia storage tank 1, it can reduce the processing volume and processing time of the BOG compressor 2 and the ammonia liquefier 3, and reduce the operating energy consumption; at the same time, because the ammonia vapor after cooling and condensing in the ammonia liquefier 3 can be further condensed and liquefied in the liquid ammonia / ammonia mixer 5, that is, the low-temperature liquid ammonia in the liquid ammonia storage tank 1 is used as the cooling medium for the ammonia vapor, the utilization rate of cold energy is improved, and the operating energy consumption and operating cost can be further reduced.

[0026] Furthermore, if Figure 1 As shown, in this embodiment, a throttle valve 6 is provided on the pipeline between the liquid ammonia outlet of the ammonia liquefier 3 and the inlet of the liquid ammonia / ammonia gas mixer 5, and the throttle valve 6 is used to throttle and cool the condensed liquid ammonia (the throttle valve 6 expands, decompresses and cools the liquid ammonia, and the pressure of the decompressed liquid ammonia is slightly higher than the pressure in the liquid ammonia / ammonia gas mixer 5).

[0027] Furthermore, if Figure 1 As shown, in this embodiment, the ship ammonia vapor treatment system also includes a booster pump 7, the inlet of the booster pump 7 is connected to the liquid ammonia outlet of the liquid ammonia / ammonia gas mixer 5, and the outlet of the booster pump 7 is used to be connected to the ammonia fuel engine; the booster pump 7 is used to pressurize the liquid ammonia in the liquid ammonia / ammonia gas mixer 5 and pump it to the ammonia fuel engine for fuel supply.

[0028] Furthermore, if Figure 1 As shown, in this embodiment, the ship ammonia vapor processing system also includes a cooling system 30, which is connected to the ammonia liquefier 3. The cooling fluid in the cooling system 30 can flow through the ammonia liquefier 3 to cool the ammonia vapor in the ammonia liquefier 3.

[0029] Furthermore, if Figure 1As shown, in this embodiment, the cooling system 30 is a water cooling system, and the cooling water in the water cooling system (i.e., the cooling fluid is cooling water) can flow through the ammonia liquefier 3 to cool the ammonia vapor in the ammonia liquefier 3. Among them, the cooling water can be seawater or low-temperature fresh water, so that the outlet condensation temperature of the ammonia liquefier 3 is as low as possible, and the proportion of condensed liquid after being treated by the throttle valve 6 is increased; at the same time, the cooling water is used to cool the ammonia vapor, and the raw materials are easy to obtain and the cost is low. Of course, in other embodiments, the cooling system 30 can also be a coolant refrigeration system, etc.

[0030] Specifically, since the liquid ammonia condensed by the ammonia liquefier 3 is ultimately supplied to the ammonia fuel engine, the temperature of the condensed liquid ammonia does not need to be too low (the supply temperature of the ammonia fuel engine is generally around 25°C to 45°C), and the liquid ammonia / ammonia vapor after cooling and condensing by the ammonia liquefier 3 can be further condensed and liquefied in the liquid ammonia / ammonia gas mixer 5. Therefore, the cooling system 30 does not need to use deep cooling equipment, but only needs to use a water cooling system (after cooling treatment by the water cooling system, the temperature of the liquid ammonia at the outlet of the ammonia liquefier 3 is around 40°C), which can save energy consumption and equipment costs of the cooling system 30.

[0031] Furthermore, if Figure 1 As shown, in this embodiment, the ammonia liquefier 3 is a heat exchanger, a heat exchange tube 31 is provided in the ammonia liquefier 3, and a water cooling system is connected to a cooling water inlet and a cooling water outlet of the heat exchange tube 31. The water cooling system may specifically include a water storage tank (not shown) and a water pump (not shown), etc. The water pump is connected to the water storage tank and the heat exchange tube 31 to transport the cooling water in the water storage tank to the heat exchange tube 31 for heat exchange.

[0032] Furthermore, if Figure 1 As shown, in this embodiment, the ship ammonia vapor treatment system also includes a ventilation mast 8, which is connected to the top outlet of the liquid ammonia / ammonia gas mixer 5, and a non-condensable gas discharge valve 81 is provided on the pipeline between the ventilation mast 8 and the top outlet of the liquid ammonia / ammonia gas mixer 5.

[0033] 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, while 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. When the non-condensable gases follow the ammonia vapor into the liquid ammonia / ammonia gas mixer 5, if these non-condensable gases are not discharged, they will gather in the liquid ammonia / ammonia gas mixer 5, resulting in overpressure of the liquid ammonia / ammonia gas mixer 5 and reducing the efficiency of reliquefaction.

[0034] Therefore, in this embodiment, by providing a vent mast 8 and a non-condensable gas discharge valve 81, when the pressure in the liquid ammonia / ammonia gas mixer 5 rises to a certain value (the more non-condensable gas in the liquid ammonia / ammonia gas mixer 5, the greater the pressure), the ammonia vapor in the liquid ammonia / ammonia gas mixer 5 is further liquefied, and at this time, most of the gas in the gas phase space in the liquid ammonia / ammonia gas mixer 5 is non-condensable gas; then the non-condensable gas discharge valve 81 is opened to discharge the non-condensable gas in the liquid ammonia / ammonia gas mixer 5 through the vent mast 8, thereby improving the re-liquefaction treatment efficiency of the ammonia vapor.

[0035] Furthermore, if Figure 1 and Figure 2 As shown, in this embodiment, a pressure sensor 51 is provided on the liquid ammonia / ammonia gas mixer 5, and the pressure sensor 51 is used to detect the pressure in the liquid ammonia / ammonia gas mixer 5 (the pressure sensor 51 specifically detects the pressure of the gas phase space in the liquid ammonia / ammonia gas mixer 5). The ship ammonia vapor treatment system also includes a control module 9, which can be a PLC control device; the non-condensable gas discharge valve 81 is an electric control valve, and the control module 9 is connected to the pressure sensor 51 and the non-condensable gas discharge valve 81 by electrical signals respectively, and the control module 9 is used to control the opening and closing of the non-condensable gas discharge valve 81 according to the pressure value detected by the pressure sensor 51. Specifically, when the pressure in the liquid ammonia / ammonia gas mixer 5 rises to a certain value, the ammonia vapor in the liquid ammonia / ammonia gas mixer 5 is further liquefied. At this time, most of the gas in the gas phase space in the liquid ammonia / ammonia gas mixer 5 is non-condensable gas. The control module 9 controls the non-condensable gas discharge valve 81 to open, so that the non-condensable gas in the liquid ammonia / ammonia gas mixer 5 is discharged through the vent 8; when the pressure in the liquid ammonia / ammonia gas mixer 5 drops to a certain value, the non-condensable gas discharge ends, and the control module 9 controls the non-condensable gas discharge valve 81 to close. At the same time, the liquid ammonia / ammonia gas mixer 5 is also provided with monitoring instruments such as a temperature sensor (not shown) and a liquid level sensor (not shown) to monitor the temperature and liquid level of the liquid ammonia in the liquid ammonia / ammonia gas mixer 5.

[0036] like Figure 3 As shown, in another embodiment, an ammonia absorption device 82 is provided between the vent mast 8 and the top outlet of the liquid ammonia / ammonia gas mixer 5 (specifically, the ammonia absorption device 82 is provided between the non-condensable gas discharge valve 81 and the vent mast 8), and the ammonia absorption device 82 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 82 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).

[0037] 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 liquid ammonia pump 4 is arranged in the liquid phase space 10B, so as to be able to absorb the liquid ammonia in the liquid phase space 10B.

[0038] Furthermore, if Figure 1 As shown, in this embodiment, the main working process of the ship ammonia vapor treatment system is as follows:

[0039] The 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 ammonia vapor in the liquid ammonia storage tank 1 enters the BOG compressor 2 and is compressed. The ammonia vapor after compression and temperature increase enters the ammonia liquefier 3. Cooling water is used as the cooling medium to condense and liquefy the ammonia vapor in the ammonia liquefier 3 into liquid ammonia. The condensed liquid ammonia is expanded, decompressed and cooled by the throttle valve 6 and then transported to the liquid ammonia / ammonia mixer 5. The liquid ammonia pump 4 transports the liquid ammonia in the liquid ammonia storage tank 1 to the liquid ammonia / ammonia mixer 5. The low-temperature liquid ammonia from the liquid ammonia storage tank 1 and the liquid ammonia from the ammonia liquefier 3 are mixed in the liquid ammonia / ammonia mixer 5. At the same time, the ammonia vapor mixed in the liquid ammonia from the ammonia liquefier 3 is further condensed and liquefied under the action of the low-temperature liquid ammonia. The liquid ammonia in the liquid ammonia / ammonia mixer 5 is supplied as fuel to the ammonia fuel engine. When a certain amount of non-condensable gas is accumulated in the liquid ammonia / ammonia gas mixer 5 , the non-condensable gas discharge valve 81 is opened to discharge the non-condensable gas in the liquid ammonia / ammonia gas mixer 5 through the vent mast 8 .

[0040] 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.

[0041] The ship ammonia vapor treatment system provided by the embodiment of the utility model is provided with a BOG compressor 2, an ammonia liquefier 3, a liquid ammonia pump 4 and a liquid ammonia / ammonia gas mixer 5. The BOG compressor 2 is used to compress the ammonia vapor from the liquid ammonia storage tank 1, and then the ammonia liquefier 3 is used to cool the ammonia vapor to condense and liquefy the ammonia vapor into liquid ammonia; the liquid ammonia condensed by the ammonia liquefier 3 and the liquid ammonia output by the liquid ammonia pump 4 can be transported to the liquid ammonia / ammonia gas mixer 5 and mixed, so that the ammonia vapor mixed in the liquid ammonia from the ammonia liquefier 3 can be further condensed and liquefied, thereby increasing the proportion of ammonia vapor re-liquefaction; the liquid ammonia mixed in the liquid ammonia / ammonia gas mixer 5 is then supplied to the ammonia fuel engine as a fuel supply source. At the same time, the liquid ammonia / ammonia gas mixer 5 can also play a role of buffering and gas-liquid separation. The condensed liquid ammonia and the unliquefied ammonia vapor can be separated into gas and liquid in the liquid ammonia / ammonia gas mixer 5. On the one hand, it can ensure that pure liquid ammonia is supplied to the ammonia fuel engine. On the other hand, when the liquid level in the liquid ammonia / ammonia gas mixer 5 gradually increases, the pressure in the liquid ammonia / ammonia gas mixer 5 gradually increases, which can further liquefy the ammonia vapor in the liquid ammonia / ammonia gas mixer 5, thereby increasing the liquefaction ratio of the ammonia vapor. The ship ammonia vapor treatment system reliquefies the ammonia vapor in the liquid ammonia storage tank 1 and supplies it as fuel, which not only reduces fuel waste, prevents the liquid ammonia storage tank 1 from overheating and overpressure, and ensures the operating safety of the liquid ammonia storage tank 1, but also because the treated liquid ammonia will not return to the liquid ammonia storage tank 1, it can reduce the processing volume and processing time of the BOG compressor 2 and the ammonia liquefier 3, and reduce the operating energy consumption; at the same time, because the ammonia vapor after cooling and condensing in the ammonia liquefier 3 can be further condensed and liquefied in the liquid ammonia / ammonia mixer 5, that is, the low-temperature liquid ammonia in the liquid ammonia storage tank 1 is used as the cooling medium for the ammonia vapor, the utilization rate of cold energy is improved, and the operating energy consumption and operating cost can be further reduced.

[0042] 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 BOG compressor (2), an ammonia liquefier (3), a liquid ammonia pump (4) and a liquid ammonia / ammonia gas mixer (5), wherein the BOG outlet of the liquid ammonia storage tank (1) is connected to the inlet of the BOG compressor (2), the outlet of the BOG compressor (2) is connected to the ammonia gas inlet of the ammonia liquefier (3), and the liquid ammonia outlet of the ammonia liquefier (3) is connected to the inlet of the liquid ammonia / ammonia gas mixer (5); the liquid ammonia pump (4) is arranged in the liquid ammonia storage tank (1), the outlet of the liquid ammonia pump (4) is connected to the inlet of the liquid ammonia / ammonia gas mixer (5), and the liquid ammonia outlet of the liquid ammonia / ammonia gas mixer (5) is used to be connected to an ammonia fuel engine; The ship ammonia vapor treatment system also includes a ventilation mast (8), which is connected to the top outlet of the liquid ammonia / ammonia gas mixer (5), and a non-condensable gas discharge valve (81) is provided on the pipeline between the ventilation mast (8) and the top outlet of the liquid ammonia / ammonia gas mixer (5).

2. The ship ammonia vapor treatment system according to claim 1, characterized in that: A throttle valve (6) is provided on the pipeline between the liquid ammonia outlet of the ammonia liquefier (3) and the inlet of the liquid ammonia / ammonia mixer (5).

3. The ship ammonia vapor treatment system according to claim 1, characterized in that: The ship ammonia vapor treatment system further comprises a booster pump (7), the inlet of the booster pump (7) is connected to the liquid ammonia outlet of the liquid ammonia / ammonia gas mixer (5), and the outlet of the booster pump (7) is used to be connected to the ammonia fuel engine.

4. The ship ammonia vapor treatment system according to claim 1, characterized in that: The ship ammonia vapor processing system further comprises a cooling system (30), wherein the cooling system (30) is connected to the ammonia liquefier (3), and a cooling fluid in the cooling system (30) can flow through the ammonia liquefier (3) to cool the ammonia vapor in the ammonia liquefier (3).

5. The ship ammonia vapor treatment system according to claim 4, characterized in that: The cooling system (30) is a water cooling system, and the cooling water in the water cooling system can flow through the ammonia liquefier (3).

6. The ship ammonia vapor treatment system according to claim 1, characterized in that: The liquid ammonia / ammonia gas mixer (5) is provided with a pressure sensor (51), and the ship ammonia vapor treatment system further comprises a control module (9), the control module (9) being respectively connected to the pressure sensor (51) and the non-condensable gas discharge valve (81) by electrical signals, and the control module (9) being used to control the opening and closing of the non-condensable gas discharge valve (81) according to the pressure value detected by the pressure sensor (51).

7. The ship ammonia vapor treatment system according to claim 1, characterized in that: An ammonia absorption device (82) is provided between the ventilation mast (8) and the top outlet of the liquid ammonia / ammonia gas mixer (5).

8. A ship, characterized in that: The invention comprises a ship ammonia vapor treatment system as claimed in any one of claims 1 to 7.

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