Ammonia vapor treatment system for ship

Abstract

A ship ammonia vapor treatment system comprises a liquid ammonia storage tank, a BOG compressor, an ammonia gas liquefier, a condensation system and a first throttling valve, and a spraying device is arranged at the top in the liquid ammonia storage tank; 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, a liquid ammonia outlet of the ammonia gas liquefier is connected with an inlet of the first throttling valve, and an outlet of the first throttling valve is connected with the spraying device; and the condensing system is connected with the ammonia liquefier. 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.

Description

Technical Field

[0001] The utility model relates to the technical field of ships, in particular to a ship ammonia vapor treatment system. 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 condensation system and a first throttle valve, wherein a spray device is provided at the top of the liquid ammonia storage tank; 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 first throttle valve, and the outlet of the first throttle valve is connected to the spray device; the condensation system is connected to the ammonia liquefier;

[0006] The BOG compressor is used to compress ammonia vapor; the condensing system is used to cool the ammonia vapor in the ammonia liquefier so that the ammonia vapor in the ammonia liquefier is condensed into liquid ammonia; the first throttle valve is used to throttle and cool the condensed liquid ammonia; the spraying device is used to spray the condensed 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 ammonia liquefier includes a tank body and a heat exchange tube arranged in the tank body, the outlet of the BOG compressor is connected to the top inlet of the tank body, and the bottom outlet of the tank body is connected to the inlet of the first throttle valve; the condensation system is connected to the heat exchange tube, and the cooling fluid in the condensation system can flow through the heat exchange tube.

[0008] Furthermore, a liquid ammonia buffer tank is provided between the ammonia liquefier and the first throttle valve, the liquid ammonia outlet of the ammonia liquefier is connected to the inlet of the liquid ammonia buffer tank, and the liquid ammonia outlet of the liquid ammonia buffer tank is connected to the inlet of the first throttle valve.

[0009] Furthermore, the ship ammonia vapor treatment system also includes a liquid ammonia pump, the inlet of the liquid ammonia pump is connected to the liquid ammonia outlet of the liquid ammonia buffer tank, and the outlet of the liquid ammonia pump is used to be connected to an ammonia fuel engine.

[0010] Furthermore, the inlet of the liquid ammonia pump is connected to the pipeline between the liquid ammonia outlet of the liquid ammonia buffer tank and the inlet of the first throttle valve, and the liquid ammonia outlet of the liquid ammonia buffer tank is connected to the inlet of the first throttle valve and the inlet of the liquid ammonia pump through the first control valve and the second control valve respectively.

[0011] The utility model provides a ship ammonia vapor processing system, comprising a liquid ammonia storage tank, a BOG compressor, an ammonia liquefier, a condensing system, a liquid ammonia buffer tank and a liquid ammonia pump; 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 buffer tank, the liquid ammonia outlet of the liquid ammonia buffer tank is connected to the inlet of the liquid ammonia pump, and the outlet of the liquid ammonia pump is used to be connected to an ammonia fuel engine; the condensing system is connected to the ammonia liquefier;

[0012] The BOG compressor is used to compress ammonia vapor; the condensing system is used to cool the ammonia vapor in the ammonia liquefier to condense the ammonia vapor in the ammonia liquefier into liquid ammonia; the liquid ammonia pump is used to pressurize the liquid ammonia in the liquid ammonia buffer tank and pump it to the ammonia fuel engine.

[0013] Furthermore, the ammonia liquefier includes a tank body and a heat exchange tube arranged in the tank body, the outlet of the BOG compressor is connected to the top inlet of the tank body, and the bottom outlet of the tank body is connected to the inlet of the liquid ammonia buffer tank; the condensation system is connected to the heat exchange tube, and the cooling fluid in the condensation system can flow through the heat exchange tube.

[0014] Furthermore, the condensation system is a water cooling system, and cooling water in the water cooling system can flow through the heat exchange tubes.

[0015] Furthermore, the condensing system is a refrigerant cooling system, which 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 inlet of the heat exchange tube, and the outlet of the heat exchange tube is connected to the inlet of the refrigeration compressor; the refrigerant can circulate between the refrigeration compressor, the condenser, the second throttle valve and the heat exchange tube.

[0016] Furthermore, the ship ammonia vapor treatment system also includes a ventilation mast, which is connected to the top outlet of the liquid ammonia buffer 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 buffer tank.

[0017] The marine ammonia vapor processing system provided by the utility model is provided with a BOG compressor, an ammonia liquefier, a condensation system and a first throttle valve, and a spray device is provided at the top of a liquid ammonia storage tank, and the ammonia vapor is firstly compressed by the BOG compressor, and then the ammonia vapor in the ammonia liquefier is cooled by the condensation system to condense the ammonia vapor in the ammonia liquefier into liquid ammonia, and then the condensed liquid ammonia is throttled and cooled by the first throttle valve; on the one hand, the throttled and cooled liquid ammonia can flow back to the liquid ammonia storage tank for re-storage and utilization, thereby reducing fuel waste; on the other hand, the throttled and cooled liquid ammonia can be sprayed on the ammonia vapor accumulated in the liquid ammonia storage tank by the spray device, so that the ammonia vapor in the liquid ammonia storage tank is condensed and liquefied, that is, the ammonia vapor in the liquid ammonia storage tank can be condensed and liquefied after being processed by the BOG compressor, the ammonia liquefier and the first throttle valve, and can also be condensed and liquefied by the liquid ammonia sprayed by the spray device, thereby greatly improving the re-liquefaction efficiency of the ammonia vapor and saving the equipment operation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a ship ammonia vapor treatment system in the first embodiment of the utility model.

[0019] Figure 2 It is a schematic structural diagram of a ship ammonia vapor treatment system in the second embodiment of the utility model.

[0020] Figure 3 It is a structural schematic diagram of a ship ammonia vapor treatment system in the third embodiment of the utility model.

[0021] Figure 4 It is a structural schematic diagram of a ship ammonia vapor treatment system in the fourth embodiment of the utility model. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] First embodiment

[0026] like Figure 1 As shown, the ship ammonia vapor treatment system provided by the first embodiment of the utility model includes a liquid ammonia storage tank 1, a BOG (ammonia vapor, Boil-Off Gas) compressor 2, an ammonia liquefier 3, a condensation system 4 and a first throttle valve 5, and a spray device 11 is provided on the top of the liquid ammonia storage tank 1. Specifically, the internal space of the liquid ammonia storage tank 1 is divided into a gas phase space and a liquid phase space, the gas phase space is located above the liquid phase space, and the spray device 11 is arranged in the gas phase space of the liquid ammonia storage tank 1.

[0027] 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, the liquid ammonia outlet of the ammonia liquefier 3 is connected to the inlet of the first throttle valve 5, the outlet of the first throttle valve 5 is connected to the spray device 11 (the spray device 11 may specifically include a spray pipe and a plurality of nozzles arranged on the spray pipe, and the outlet of the first throttle valve 5 is connected to the spray pipe); the condensation system 4 is connected to the ammonia liquefier 3.

[0028] 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 condensation system 4 is used to cool the ammonia vapor in the ammonia liquefier 3, so that the ammonia vapor in the ammonia liquefier 3 is condensed into liquid ammonia; the first throttle valve 5 is used to throttle and cool the condensed liquid ammonia; the spraying device 11 is used to spray the condensed 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.

[0029] The marine ammonia vapor processing system provided by the utility model is provided with a BOG compressor 2, an ammonia liquefier 3, a condensation system 4 and a first throttle valve 5, and a spray device 11 is provided on the top of a liquid ammonia storage tank 1, and the ammonia vapor is first compressed by the BOG compressor 2, and then the ammonia vapor in the ammonia liquefier 3 is cooled by the condensation system 4, so that the ammonia vapor in the ammonia liquefier 3 is condensed into liquid ammonia, and then the first throttle valve 5 is used to throttle and cool the condensed liquid ammonia; on the one hand, the throttled and cooled liquid ammonia can flow back to the liquid ammonia storage tank 1 for re-storage and utilization, thereby Reduce fuel waste; on the other hand, the liquid ammonia after throttling and cooling can be sprayed on the ammonia vapor accumulated in the liquid ammonia storage tank 1 through the spray device 11, so that the ammonia vapor in the liquid ammonia storage tank 1 is condensed and liquefied, that is, the ammonia vapor in the liquid ammonia storage tank 1 can be condensed and liquefied after being processed by the BOG compressor 2, the ammonia liquefier 3 and the first throttle valve 5, and can also be condensed and liquefied by the liquid ammonia sprayed by the spray device 11, thereby greatly improving the reliquefaction efficiency of the ammonia vapor and saving the equipment operation cost (that is, reducing the processing volume of the BOG compressor 2, the ammonia liquefier 3 and the first throttle valve 5).

[0030] Furthermore, if Figure 1 As shown, in this embodiment, the ammonia liquefier 3 includes a tank body 31 and a heat exchange tube 32 disposed in the tank body 31, the outlet of the BOG compressor 2 is connected to the top inlet of the tank body 31, and the bottom outlet of the tank body 31 is connected to the inlet of the first throttle valve 5 (the condensed liquid ammonia will be concentrated in the lower space in the tank body 31, and the uncondensed ammonia vapor will be concentrated in the upper space in the tank body 31). The condensation system 4 is connected to the heat exchange tube 32, and the cooling fluid in the condensation system 4 can flow through the heat exchange tube 32 to cool the ammonia vapor in the tank body 31.

[0031] Furthermore, if Figure 1 As shown, in this embodiment, the condensation system 4 is a water cooling system, and the cooling water in the water cooling system (that is, the cooling fluid is cooling water) can flow through the heat exchange tube 32. 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 first throttle valve 5 is increased; at the same time, the ammonia vapor is cooled by cooling water, and the raw materials are easy to obtain and the cost is low. 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 32 to transport the cooling water in the water storage tank to the heat exchange tube 32 for heat exchange.

[0032] Furthermore, if Figure 1As shown, in this embodiment, a liquid ammonia buffer tank 6 is further provided between the ammonia liquefier 3 and the first throttle valve 5, the liquid ammonia outlet of the ammonia liquefier 3 is connected to the inlet of the liquid ammonia buffer tank 6, and the liquid ammonia outlet of the liquid ammonia buffer tank 6 is connected to the inlet of the first throttle valve 5. The liquid ammonia buffer tank 6 can play the role of buffering and gas-liquid separation. Since the present embodiment adopts a water cooling system to cool the ammonia vapor in the ammonia liquefier 3, the temperature of the condensed liquid ammonia cannot be reduced to a very low level (the temperature of the condensed liquid ammonia is generally around 40°C), so the liquid ammonia condensed by the ammonia liquefier 3 contains a small amount of unliquefied ammonia vapor; by providing a liquid ammonia buffer tank 6, the condensed liquid ammonia and the unliquefied ammonia vapor can be separated into gas and liquid in the liquid ammonia buffer tank 6, which can ensure that the medium entering the first throttle valve 5 is pure liquid ammonia, thereby increasing the proportion of condensed liquid after being treated by the first throttle valve 5; on the other hand, when the amount of gas in the liquid ammonia buffer tank 6 (the gas includes unliquefied ammonia vapor and the non-condensable gas described below) gradually increases, the pressure in the liquid ammonia buffer tank 6 gradually increases, which can further liquefy the ammonia vapor in the liquid ammonia buffer tank 6, thereby increasing the liquefaction ratio of the ammonia vapor, that is, improving the recovery rate of the ammonia vapor.

[0033] Specifically, the liquid ammonia buffer tank 6 is provided with monitoring instruments such as a pressure sensor, a temperature sensor and a liquid level sensor. The liquid ammonia is discharged to the first throttle valve 5 only when the liquid level in the liquid ammonia buffer tank 6 reaches a certain height. On the one hand, it can ensure that the medium entering the first throttle valve 5 is pure liquid ammonia. On the other hand, it can increase the pressure in the liquid ammonia buffer tank 6 (hold the pressure), thereby further liquefying the ammonia vapor in the liquid ammonia buffer tank 6.

[0034] Furthermore, if Figure 1 As shown, in this embodiment, the ship ammonia vapor treatment system also includes a ventilation mast 8 for discharging non-condensable gas, the ventilation mast 8 is connected to the top outlet of the liquid ammonia buffer tank 6, and a non-condensable gas discharge valve 93 is provided on the pipeline between the ventilation mast 8 and the top outlet of the liquid ammonia buffer tank 6.

[0035] 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.

[0036] Therefore, in this embodiment, by providing a vent mast 8 and a non-condensable gas discharge valve 93, when the pressure in the liquid ammonia buffer tank 6 rises to a certain value (the more non-condensable gas in the liquid ammonia buffer tank 6, the greater the pressure), the ammonia vapor in the liquid ammonia buffer tank 6 is further liquefied. At this time, most of the gas in the gas phase space in the liquid ammonia buffer tank 6 is non-condensable gas; then the non-condensable gas discharge valve 93 is opened to discharge the non-condensable gas in the liquid ammonia buffer tank 6 through the vent mast 8, thereby improving the reliquefaction processing efficiency of the system.

[0037] Furthermore, if Figure 1 As shown, in this embodiment, a first regulating valve 94 is provided on the pipeline between the BOG outlet of the liquid ammonia storage tank 1 and the inlet of the BOG compressor 2. The first regulating valve 94 can regulate and control the inlet pressure of the BOG compressor 2. The inlet pressure of the BOG compressor 2 can be adjusted according to the actual working conditions. A second regulating valve 95 is provided on the pipeline between the liquid ammonia outlet of the ammonia liquefier 3 and the inlet of the liquid ammonia buffer tank 6.

[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 at the top of the liquid ammonia storage tank 1. After the first regulating valve 94 is opened, the ammonia vapor in the liquid ammonia storage tank 1 enters the BOG compressor 2 and is compressed (compressed to a pressure of about 18 kg); the ammonia vapor after compression and temperature increase enters the ammonia liquefier 3, and exchanges heat with the cooling water in the condensation system 4, so that the ammonia vapor is cooled to about 40°C and becomes liquid ammonia.

[0040] The condensed liquid ammonia is collected in the liquid ammonia buffer tank 6. When the liquid level in the liquid ammonia buffer tank 6 reaches a certain height, the first throttle valve 5 is opened, and the liquid ammonia is decompressed through the first throttle valve 5 to a pressure slightly higher than the pressure of the liquid ammonia storage tank 1 and the pipeline back pressure. At the same time, the temperature is reduced to the saturation temperature under the current pressure. Under the action of the pressure difference, the liquid ammonia is transported back to the liquid ammonia storage tank 1, and sprayed into the liquid ammonia storage tank 1 through the spraying device 11, and heat is exchanged with the ammonia vapor at the top of the liquid ammonia storage tank 1, so that the ammonia vapor in the liquid ammonia storage tank 1 is further condensed and liquefied into liquid ammonia; at the same time, when the pressure in the liquid ammonia buffer tank 6 rises to a certain value, the ammonia vapor in the liquid ammonia buffer tank 6 is further liquefied. At this time, most of the gas in the gas phase space in the liquid ammonia buffer tank 6 is non-condensable gas, and then the non-condensable gas discharge valve 93 is opened to discharge the non-condensable gas in the liquid ammonia buffer tank 6 to the atmosphere through the vent mast 8, thereby improving the reliquefaction treatment efficiency of the system. After the exhaust is completed, the non-condensable gas discharge valve 93 is closed to ensure the condensation pressure in the BOG compressor 2 and the ammonia liquefier 3.

[0041] 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 condensation system 4 and a first throttle valve 5, and a spray device 11 is provided on the top of the liquid ammonia storage tank 1, and the ammonia vapor is first compressed by the BOG compressor 2, and then the ammonia vapor in the ammonia liquefier 3 is cooled by the condensation system 4, so that the ammonia vapor in the ammonia liquefier 3 is condensed into liquid ammonia, and then the first throttle valve 5 is used to throttle and cool the condensed liquid ammonia; on the one hand, the throttled and cooled liquid ammonia can be returned to the storage tank 1; on the other ... On the other hand, the liquid ammonia after throttling and cooling can be sprayed on the ammonia vapor accumulated in the liquid ammonia storage tank 1 by the spray device 11, so that the ammonia vapor in the liquid ammonia storage tank 1 is condensed and liquefied, that is, the ammonia vapor in the liquid ammonia storage tank 1 can be condensed and liquefied after being processed by the BOG compressor 2, the ammonia liquefier 3 and the first throttle valve 5, and can also be condensed and liquefied by the liquid ammonia sprayed by the spray device 11, thereby greatly improving the reliquefaction efficiency of ammonia vapor and saving equipment operation costs. The ship ammonia vapor processing system can convert the ammonia vapor in the ship liquid ammonia storage tank 1 into a low-temperature liquid by liquefaction and transport it back to the liquid ammonia storage tank 1, offset the heat input from the environment, control the temperature and pressure of the liquid ammonia storage tank 1, and ensure the safety of operation.

[0042] Second embodiment

[0043] like Figure 2 As shown, the ship ammonia vapor treatment system provided by the second embodiment of the utility model is basically the same as the first embodiment, and the difference lies in the structure of the condensation system 4.

[0044] Specifically, in this embodiment, the condensation system 4 is a refrigerant cooling system, which includes a refrigeration compressor 41, a condenser 42 and a second throttle valve 43, the outlet of the refrigeration compressor 41 is connected to the inlet of the condenser 42, the outlet of the condenser 42 is connected to the inlet of the second throttle valve 43, the outlet of the second throttle valve 43 is connected to the inlet of the heat exchange tube 32, and the outlet of the heat exchange tube 32 is connected to the inlet of the refrigeration compressor 41; the refrigerant can circulate between the refrigeration compressor 41, the condenser 42, the second throttle valve 43 and the heat exchange tube 32. The condenser 42 can use cooling water as a cold source, and the cooling water can be seawater or low-temperature fresh water.

[0045] Specifically, after the low-temperature liquid refrigerant exchanges heat with the ammonia vapor in the ammonia liquefier 3 in the heat exchange tube 32, the ammonia vapor in the ammonia liquefier 3 is condensed into liquid ammonia, and at the same time, the refrigerant absorbs heat and evaporates into a gas; the gaseous refrigerant enters the refrigeration compressor 41, and the refrigeration compressor 41 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 42 to be cooled and condensed into a liquid refrigerant, and the liquid refrigerant expands, reduces pressure and cools down through the second throttle valve 43, and then enters the heat exchange tube 32 again to exchange heat with the ammonia vapor in the ammonia liquefier 3, completing the refrigerant cycle.

[0046] 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 ammonia vapor in the ammonia liquefier 3 and release heat in the cooling water in the condenser 42, thereby achieving a good heat exchange effect and improving the cooling efficiency.

[0047] At the same time, compared with the first embodiment, since the present embodiment adopts a refrigerant cooling system to cool the ammonia vapor in the ammonia liquefier 3, the temperature of the liquid ammonia at the outlet of the ammonia liquefier 3 is lower (the outlet liquid ammonia temperature is about -40°C), the reliquefaction efficiency of the ammonia vapor in the ammonia liquefier 3 is higher, and more cold energy is transported back to the liquid ammonia storage tank 1. Therefore, there is no need to set a liquid ammonia buffer tank 6 for gas-liquid separation between the ammonia liquefier 3 and the first throttle valve 5 (the ammonia vapor is almost completely liquefied after passing through the ammonia liquefier 3), and no ventilation mast 8 and non-condensable gas discharge valve 93 are set (of course, liquid ammonia buffer tank 6, ventilation mast 8 and non-condensable gas discharge valve 93 can also be set).

[0048] The other structures and functions of this embodiment are the same or similar to those of the first embodiment and are not described in detail here.

[0049] Third embodiment

[0050] like Figure 3 As shown, the ship ammonia vapor treatment system provided by the third embodiment of the utility model is substantially the same as the first embodiment, except that the flow direction of the reliquefied liquid ammonia is different.

[0051] Specifically, the ship ammonia vapor treatment system provided by the embodiment of the utility model includes a liquid ammonia storage tank 1, a BOG compressor 2, an ammonia liquefier 3, a condensation system 4, a liquid ammonia buffer tank 6 and a liquid ammonia pump 7. 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, the liquid ammonia outlet of the ammonia liquefier 3 is connected to the inlet of the liquid ammonia buffer tank 6, the liquid ammonia outlet of the liquid ammonia buffer tank 6 is connected to the inlet of the liquid ammonia pump 7, and the outlet of the liquid ammonia pump 7 is used to be connected to an ammonia fuel engine (not shown), so as to supply fuel to the ammonia fuel engine; the condensation system 4 is connected to the ammonia liquefier 3.

[0052] Among them, the liquid ammonia storage tank 1 is used to store liquid ammonia; the BOG compressor 2 is used to compress ammonia vapor; the condensation system 4 is used to cool the ammonia vapor in the ammonia liquefier 3, so that the ammonia vapor in the ammonia liquefier 3 is condensed into liquid ammonia; the liquid ammonia buffer tank 6 plays the role of buffering, collecting liquid ammonia and gas-liquid separation; the liquid ammonia pump 7 is used to pressurize the liquid ammonia in the liquid ammonia buffer tank 6 and pump it to the ammonia fuel engine.

[0053] Furthermore, if Figure 3 As shown, in this embodiment, the ammonia liquefier 3 includes a tank body 31 and a heat exchange tube 32 arranged in the tank body 31, the outlet of the BOG compressor 2 is connected to the top inlet of the tank body 31, and the bottom outlet of the tank body 31 is connected to the inlet of the liquid ammonia buffer tank 6; the condensation system 4 is connected to the heat exchange tube 32, and the cooling fluid in the condensation system 4 can flow through the heat exchange tube 32.

[0054] Furthermore, if Figure 3 As shown, in this embodiment, the condensing system 4 is a water cooling system, and the cooling water in the water cooling system can flow through the heat exchange tube 32. Of course, in other embodiments, the condensing system 4 can also be a refrigerant cooling system (the specific structure and working principle of the refrigerant cooling system can refer to the second embodiment, which will not be repeated here).

[0055] Furthermore, if Figure 3 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 buffer tank 6, and a non-condensable gas discharge valve 93 is provided on the pipeline between the ventilation mast 8 and the top outlet of the liquid ammonia buffer tank 6.

[0056] The marine ammonia vapor treatment system provided in this embodiment provides fuel supply for the ammonia fuel engine by condensing and liquefying the ammonia vapor in the liquid ammonia storage tank 1 into liquid ammonia, thereby reducing fuel waste. At the same time, since the condensed liquid ammonia does not need to flow back to the liquid ammonia storage tank 1, there is no need to set a spray device 11 in the liquid ammonia storage tank 1, and there is no need to set a first throttle valve 5 after the liquid ammonia buffer tank 6.

[0057] The other structures and functions of this embodiment are the same or similar to those of the first embodiment and are not described in detail here.

[0058] Fourth embodiment

[0059] like Figure 4 As shown, the ship ammonia vapor treatment system provided by the fourth embodiment of the utility model is basically the same as the first embodiment, and the difference lies in the flow direction of the reliquefied liquid ammonia.

[0060] Specifically, based on the first embodiment, the ship ammonia vapor treatment system of this embodiment also includes a liquid ammonia pump 7, the inlet of the liquid ammonia pump 7 is connected to the liquid ammonia outlet of the liquid ammonia buffer tank 6, and the outlet of the liquid ammonia pump 7 is used to be connected to an ammonia fuel engine (not shown), so that the condensed liquid ammonia can selectively flow back to the liquid ammonia storage tank 1, and can also provide fuel supply to the ammonia fuel engine through the liquid ammonia pump 7.

[0061] Furthermore, if Figure 4 As shown, in this embodiment, the inlet of the liquid ammonia pump 7 is connected to the pipeline between the liquid ammonia outlet of the liquid ammonia buffer tank 6 and the inlet of the first throttle valve 5, and the liquid ammonia outlet of the liquid ammonia buffer tank 6 is connected to the inlet of the first throttle valve 5 and the inlet of the liquid ammonia pump 7 through the first control valve 91 and the second control valve 92 respectively; by controlling the opening and closing of the first control valve 91 and the second control valve 92, the flow direction of the liquid ammonia in the liquid ammonia buffer tank 6 is controlled. Of course, in other embodiments, the inlet of the first throttle valve 5 and the inlet of the liquid ammonia pump 7 can also be connected to different liquid ammonia outlets on the liquid ammonia buffer tank 6 respectively.

[0062] Furthermore, if Figure 4 As shown, in this embodiment, the condensation system 4 is a water cooling system. Of course, in other embodiments, the condensation system 4 can also be a refrigerant cooling system (the specific structure and working principle of the refrigerant cooling system can refer to the second embodiment, which will not be repeated here).

[0063] The other structures and functions of this embodiment are the same or similar to those of the first embodiment and are not described in detail here.

[0064] 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 condensing system (4) and a first throttle valve (5); a spraying device (11) is provided on the top of the liquid ammonia storage tank (1); 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); the liquid ammonia outlet of the ammonia liquefier (3) is connected to the inlet of the first throttle valve (5); the outlet of the first throttle valve (5) is connected to the spraying device (11); the condensing system (4) is connected to the ammonia liquefier (3); The BOG compressor (2) is used to compress ammonia vapor; the condensing system (4) is used to cool the ammonia vapor in the ammonia liquefier (3) so that the ammonia vapor in the ammonia liquefier (3) is condensed into liquid ammonia; the first throttle valve (5) is used to throttle and cool the condensed liquid ammonia; the spraying device (11) is used to spray the condensed 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 ammonia liquefier (3) comprises a tank body (31) and a heat exchange tube (32) arranged in the tank body (31); the outlet of the BOG compressor (2) is connected to the top inlet of the tank body (31), and the bottom outlet of the tank body (31) is connected to the inlet of the first throttle valve (5); the condensation system (4) is connected to the heat exchange tube (32), and the cooling fluid in the condensation system (4) can flow through the heat exchange tube (32).

3. The ship ammonia vapor treatment system according to claim 1, characterized in that: A liquid ammonia buffer tank (6) is also provided between the ammonia liquefier (3) and the first throttle valve (5); the liquid ammonia outlet of the ammonia liquefier (3) is connected to the inlet of the liquid ammonia buffer tank (6); and the liquid ammonia outlet of the liquid ammonia buffer tank (6) is connected to the inlet of the first throttle valve (5).

4. The ship ammonia vapor treatment system according to claim 3, characterized in that: The ship ammonia vapor treatment system further comprises a liquid ammonia pump (7), the inlet of the liquid ammonia pump (7) is connected to the liquid ammonia outlet of the liquid ammonia buffer tank (6), and the outlet of the liquid ammonia pump (7) is used to be connected to an ammonia fuel engine.

5. The ship ammonia vapor treatment system according to claim 4, characterized in that: The inlet of the liquid ammonia pump (7) is connected to the pipeline between the liquid ammonia outlet of the liquid ammonia buffer tank (6) and the inlet of the first throttle valve (5), and the liquid ammonia outlet of the liquid ammonia buffer tank (6) is connected to the inlet of the first throttle valve (5) and the inlet of the liquid ammonia pump (7) through a first control valve (91) and a second control valve (92), respectively.

6. 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 condensing system (4), a liquid ammonia buffer tank (6) and a liquid ammonia pump (7); 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), the liquid ammonia outlet of the ammonia liquefier (3) is connected to the inlet of the liquid ammonia buffer tank (6), the liquid ammonia outlet of the liquid ammonia buffer tank (6) is connected to the inlet of the liquid ammonia pump (7), and the outlet of the liquid ammonia pump (7) is used to be connected to an ammonia fuel engine; the condensing system (4) is connected to the ammonia liquefier (3); The BOG compressor (2) is used to compress ammonia vapor; the condensation system (4) is used to cool the ammonia vapor in the ammonia liquefier (3) so that the ammonia vapor in the ammonia liquefier (3) is condensed into liquid ammonia; and the liquid ammonia pump (7) is used to pressurize the liquid ammonia in the liquid ammonia buffer tank (6) and pump it to the ammonia fuel engine.

7. The ship ammonia vapor treatment system according to claim 6, characterized in that: The ammonia liquefier (3) comprises a tank body (31) and a heat exchange tube (32) arranged in the tank body (31); the outlet of the BOG compressor (2) is connected to the top inlet of the tank body (31), and the bottom outlet of the tank body (31) is connected to the inlet of the liquid ammonia buffer tank (6); the condensation system (4) is connected to the heat exchange tube (32), and the cooling fluid in the condensation system (4) can flow through the heat exchange tube (32).

8. The ship ammonia vapor treatment system according to claim 2 or 7, characterized in that: The condensation system (4) is a water cooling system, and the cooling water in the water cooling system can flow through the heat exchange tube (32).

9. The ship ammonia vapor treatment system according to claim 2 or 7, characterized in that: The condensing system (4) is a refrigerant cooling system, which comprises a refrigeration compressor (41), a condenser (42) and a second throttle valve (43); the outlet of the refrigeration compressor (41) is connected to the inlet of the condenser (42), the outlet of the condenser (42) is connected to the inlet of the second throttle valve (43), the outlet of the second throttle valve (43) is connected to the inlet of the heat exchange tube (32), and the outlet of the heat exchange tube (32) is connected to the inlet of the refrigeration compressor (41); the refrigerant can circulate between the refrigeration compressor (41), the condenser (42), the second throttle valve (43) and the heat exchange tube (32).

10. The ship ammonia vapor treatment system according to claim 3 or 6, characterized in that: The ship ammonia vapor treatment system also includes a ventilation mast (8), which is connected to the top outlet of the liquid ammonia buffer tank (6), and a non-condensable gas discharge valve (93) is provided on the pipeline between the ventilation mast (8) and the top outlet of the liquid ammonia buffer tank (6).

Images