Watercraft

Abstract

To effectively utilize a space in a hull by suppressing an increase in size of a bilge tank.SOLUTION: The ship includes a hull, an ammonia-related facility provided in the hull, a bilge tank configured to store bilge generated in the hull, a liquid discharge line connected to the bilge tank and configured to discharge liquid from the bilge tank, a gas discharge line connected to an upper portion of the bilge tank and configured to discharge gas from the bilge tank, and a heating unit configured to heat the bilge in the bilge tank.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to marine vessels. [Background technology]

[0002] When ammonia is used as fuel or loaded as cargo on a ship, bilge water containing ammonia may accumulate inside the ship. Patent Document 1 discloses a configuration in which a bilge tank for storing bilge water is provided inside the hull of a ship. In this configuration, the bilge water containing ammonia stored in the bilge tank is unloaded at a port or the like and disposed of at a land-based facility. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-123982 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the configuration described in Patent Document 1, bilge water generated while the ship is sailing must be stored in a bilge tank until the ship is unloaded at a port, etc. This results in an increase in the size of the bilge tank, which can hinder the effective use of space inside the ship.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a ship that can prevent the bilge tank from becoming too large and can make effective use of the space inside the hull. [Means for solving the problem]

[0006] In order to solve the above problems, a ship according to the present disclosure includes a hull, ammonia-related equipment, a bilge tank, a liquid discharge line, a gas discharge line, and a heating unit. The ammonia-related equipment is provided in the hull. The bilge tank stores bilge generated within the hull. The liquid discharge line is connected to the bilge tank and is capable of discharging liquid from the bilge tank. The gas discharge line is connected to an upper portion of the bilge tank and is capable of discharging gas from the bilge tank. The heating unit is capable of heating the bilge in the bilge tank. [Effects of the Invention]

[0007] According to the ship of the present disclosure, it is possible to prevent the bilge tank from becoming too large and to make effective use of the space inside the hull. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of a vessel according to an embodiment of the present disclosure. [Figure 2] 1 is a diagram illustrating a configuration of a bilge treatment facility of a ship according to an embodiment of the present disclosure. FIG. [Figure 3] FIG. 10 is a diagram illustrating a configuration of a bilge treatment facility of a ship according to a first modified example of an embodiment of the present disclosure. [Figure 4] FIG. 10 is a diagram illustrating a configuration of a bilge treatment facility of a ship according to a second modified example of an embodiment of the present disclosure. [Figure 5] FIG. 10 is a diagram illustrating a configuration of a bilge treatment facility of a ship according to a third modified example of an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a vessel according to an embodiment of the present disclosure will be described with reference to FIGS. (Vessel configuration) As shown in Fig. 1, the ship 1 mainly comprises a hull 2, an ammonia-related facility 10, a bilge well 15, and a bilge treatment facility 20. The type of ship 1 is not limited to a specific one. Examples of the type of ship 1 include carriers of liquefied gases such as liquefied natural gas (LNG), carbon dioxide, ammonia, and methanol, ferries, RORO ships (roll-on / roll-off ships), PCTCs (pure car & truck carriers), and passenger ships.

[0010] (Hull configuration) The hull 2 ​​has a pair of side walls 3A, 3B, a bottom wall 4, and an upper deck 5 that form its outer hull. The side walls 3A, 3B have a pair of side shell plates that form the port and starboard sides, respectively. The bottom wall 4 has a bottom shell plate that connects the side walls 3A, 3B. The upper deck 5 illustrated in this embodiment is a full-length deck that is exposed to the outside. A superstructure 7 having accommodation areas is formed on the hull 2. Note that the location of the superstructure 7 is merely an example, and it may be located, for example, on the bow 2a side of the hull 2.

[0011] (Configuration of ammonia-related facilities) The ammonia-related facility 10 is a facility that handles ammonia, and is installed, for example, inside the hull 2. An example of the ammonia-related facility 10 is a combustion device that uses ammonia as fuel. The combustion device is a device that generates thermal energy by burning ammonia as fuel. Examples of the combustion device include an internal combustion engine used as a main engine for propelling the ship 1, an internal combustion engine used in a power generation facility that supplies electricity to the ship 1, and a boiler that generates steam as a working fluid.

[0012] The ammonia-related facility 10 may also include an ammonia storage tank that stores liquefied ammonia as fuel to be used in the combustion device, and a piping system that is connected to the combustion device and the ammonia storage tank and through which a fluid containing ammonia flows. Furthermore, when the ship 1 is a carrier ship carrying liquefied ammonia as cargo, the ammonia-related facility 10 may include a tank capable of storing liquefied ammonia as cargo, a piping system connected to the tank, and the like.

[0013] (Bilge well configuration) A bilge well 15 is provided within the hull 2. The bilge well 15 refers to a location where bilge generated within the hull 2 ​​collects. In other words, multiple bilge wells 15 may be provided within the hull 2. An example of the bilge well 15 is the bottom 2d within the hull 2. Another example of the bilge well 15 is a tray (not shown) that is arranged below the combustion device, ammonia storage tank, piping system, etc. that make up the ammonia-related facility 10, and that receives liquid that leaks from the combustion device, ammonia storage tank, piping system, etc.

[0014] (Bilge treatment equipment configuration) FIG. 2 is a diagram showing the configuration of the bilge treatment equipment installed inside the hull. 2, the bilge treatment equipment 20 includes at least a bilge recovery line 101, a bilge tank 21, a heating unit 23, a gas discharge line 103, and a liquid discharge line 104. The bilge treatment equipment 20 is provided inside the hull 2. In this embodiment, the bilge treatment equipment 20 is provided in an equipment room such as a fuel adjustment room in which the ammonia-related equipment 10 is provided. Note that the ammonia-related equipment 10, bilge well 15, and bilge treatment equipment 20 may also be provided in a compartment provided on the upper deck 5, such as a fuel adjustment room or a cargo machinery room.

[0015] The bilge recovery line 101 recovers liquid bilge accumulated in the bilge well 15 inside the hull 2 ​​and sends it to the bilge tank 21. One end of the bilge recovery line 101 is connected to the bilge well 15. The other end of the bilge recovery line 101 is connected to the bilge tank 21. A bilge pump 22 is provided midway along the bilge recovery line 101. The bilge pump 22 sucks the bilge accumulated in the bilge well 15 and pumps it into the bilge tank 21. Note that if the bilge tank 21 is installed lower than the multiple bilge wells 15, the bilge pump 22 may be omitted. Also, for example, if multiple bilge wells 15 are arranged inside the hull 2, multiple bilge recovery lines 101 may be provided corresponding to the number of bilge wells 15. Also, for example, if multiple bilge wells 15 are provided, recovery lines (not shown) connected to each bilge well 15 may be configured to merge and connect to one end of the bilge recovery line 101.

[0016] The bilge recovery line 101 recovers bilge water intermittently, for example, at appropriate time intervals while the vessel 1 is sailing. Specifically, while the vessel 1 is sailing, the bilge pump 22 operates at appropriate time intervals, and bilge water accumulated in the bilge well 15 inside the hull 2 ​​is sucked up by the bilge recovery line 101. The bilge water sucked up by the bilge recovery line 101 is sent to the bilge tank 21 and stored in the bilge tank 21. When all of the bilge water accumulated in the bilge well 15 inside the hull 2 ​​has been sent to the bilge tank 21, the bilge pump 22 stops, and bilge recovery is completed. Note that, although the example has been given in which the bilge pump 22 is stopped and bilge recovery is completed after all of the bilge water accumulated in the bilge well 15 has been collected, the present invention is not limited to this configuration. For example, after the bilge accumulated in the bilge well 15 inside the hull 2 ​​is pumped into the bilge tank 21 for a preset time, the bilge pump 22 may be stopped even if the entire amount has not been collected, and the collection of the bilge may be completed.

[0017] The bilge tank 21 can store bilge water sent through the bilge recovery line 101. The bilge water (liquid L) sent through the bilge recovery line 101 accumulates in the lower part of the bilge tank 21. In other words, the liquid L is stored in the lower part of the bilge tank 21, and gas A is stored above the liquid L in the bilge tank 21.

[0018] A heating unit 23 is provided in the bilge tank 21. The heating unit 23 is capable of heating the bilge in the bilge tank 21. The heating unit 23 is provided in a lower part of the bilge tank 21 so as to be able to heat the liquid L stored in the bilge tank 21. The lower part of the bilge tank 21 may be, for example, a position closer to the bottom of the bilge tank 21 than to the center of the bilge tank 21 in the vertical direction. The heating unit 23 includes a heating unit main body 24 and a controller 25.

[0019] The heating unit main body 24 is capable of heating the liquid L in the bilge tank 21, i.e., the bilge stored in the bilge tank 21. An example of the heating unit main body 24 is a heat coil. The heating unit main body 24 is disposed in the lower part of the bilge tank 21 and is immersed in the bilge in the bilge tank 21. The heating unit main body 24 is not limited to a heat coil and may have any configuration as long as it is capable of heating the bilge in the bilge tank 21. The heating unit main body 24 increases the temperature of the liquid L in the bilge tank 21 to a temperature at which ammonia can be expelled into the gas phase, for example. The temperature at which ammonia can be expelled into the gas phase is higher than room temperature and lower than the boiling temperature of the liquid L (for example, 100°C), and an example of this temperature is approximately 70°C to 80°C.

[0020] The controller 25 switches ON / OFF of the power supply to the heating unit main body 24. The heating unit main body 24 generates heat when power is supplied by the controller 25, but does not generate heat when power is not supplied. In other words, the liquid L in the bilge tank 21 is heated by the heating unit main body 24 only when the heating unit main body 24 generates heat while immersed in the liquid L. For example, when the bilge stored in the bilge tank 21 contains ammonia, the ammonia contained in the bilge is vaporized by heating the bilge with the heating unit main body 24. The vaporized ammonia accumulates at least in the upper part of the bilge tank 21.

[0021] The bilge tank 21 is provided with an information acquisition unit 31 that acquires information regarding the ammonia concentration in the bilge tank 21. The ammonia concentration in the bilge can be estimated from pH. Therefore, in this embodiment, a pH sensor that detects the pH (hydrogen ion exponent) of the bilge in the bilge tank 21 is provided as the information acquisition unit 31.

[0022] The heating unit 23 heats the bilge based on information about the ammonia concentration acquired by the information acquiring unit 31. In this embodiment, the power supply to the heating unit main body 24 is switched ON / OFF depending on the pH of the bilge in the bilge tank 21 acquired by the information acquiring unit 31.

[0023] The ON / OFF switching of the power supply to the heating unit main body 24 in accordance with the pH of the bilge may be performed by, for example, an operator operating the controller 25. In addition, the detection result of the bilge pH acquired by the information acquisition unit 31 may be output to the controller 25, which then performs processing based on a predetermined program and controls the ON / OFF switching of the power supply to the heating unit main body 24 based on whether the bilge pH is above a preset threshold value.

[0024] The gas discharge line 103 is connected to the upper part of the bilge tank 21. The gas discharge line 103 is capable of discharging gas A accumulated in the upper part of the bilge tank 21 from the bilge tank 21 to the outside of the bilge tank 21. In this embodiment, the gas discharge line 103 discharges gas A into the atmosphere. The gas A accumulated in the upper part of the bilge tank 21 and discharged through the gas discharge line 103 may contain ammonia.

[0025] A gas detector 41 and an air supply unit 42 are provided along the gas exhaust line 103. The gas detector 41 detects the ammonia concentration of gas A flowing through the gas exhaust line 103. The air supply unit 42 is a fan and is capable of supplying dilution gas to reduce the ammonia concentration of gas A exhausted through the gas exhaust line 103. An example of the dilution gas is ambient air (air) taken in from the outside. The air supply unit 42 is capable of adjusting the flow rate of the dilution gas sent into the gas exhaust line 103 based on the ammonia concentration detected by the gas detector 41.

[0026] In this embodiment, a gas supply line 109 is connected to the gas discharge line 103. The gas supply line 109 can supply the ammonia-containing gas A discharged through the gas discharge line 103 to equipment provided inside the hull 2. Examples of the equipment provided inside the hull 2 ​​include an internal combustion engine and a boiler included in the ammonia-related facility 10, a denitration facility, and a re-liquefaction device for liquefying the gas A and returning it to the bilge tank 21.

[0027] The liquid discharge line 104 is connected to the bilge tank 21. The liquid discharge line 104 illustrated in this embodiment is connected to the lower part of the bilge tank 21. The liquid discharge line 104 is capable of discharging the liquid L from the bilge tank 21 to the outside of the bilge tank 21. An on-off valve 104v is provided midway along the liquid discharge line 104. The liquid discharge line 104 is capable of discharging the liquid L in the bilge tank 21 by opening the on-off valve 104v.

[0028] In this embodiment, the liquid discharge line 104 branches into a first branch line 106, a second branch line 107, and a third branch line 108 downstream of the on-off valve 104v.

[0029] The first branch line 106 opens toward the outside of the ship. An on-off valve 106v is provided midway along the first branch line 106. By opening the on-off valve 106v, the first branch line 106 can discharge the liquid L in the bilge tank 21 outside the ship.

[0030] The second branch line 107 is connected to an ammonia drain tank (not shown) provided inside the hull 2. An on-off valve 107v is provided midway along the second branch line 107. By opening the on-off valve 107v, the second branch line 107 can discharge the liquid L in the bilge tank 21 into the ammonia drain tank. The liquid L discharged into the ammonia drain tank is unloaded onto a land facility at a port or the like.

[0031] The third branch line 108 is connected to a liquid treatment unit 50 provided within the hull 2. An on-off valve 108v is provided midway along the third branch line 108. By opening the on-off valve 108v, the third branch line 108 sends the liquid L in the bilge tank 21 to the liquid treatment unit 50. The liquid treatment unit 50 separates the water and oil contained in the liquid L discharged through the liquid discharge line 104. The water separated from the liquid L by the liquid treatment unit 50 is discharged, for example, overboard. The oil separated from the liquid L by the liquid treatment unit 50 is stored in a waste oil tank (not shown) provided within the hull 2.

[0032] (Action and effect) In the ship of the above embodiment, the bilge tank 21 that stores bilge gas generated inside the hull 2 ​​is provided with a heating unit 23. As a result, if the bilge gas contains ammonia, the bilge gas in the bilge tank 21 is heated by the heating unit 23, and the ammonia contained in the bilge gas is vaporized and separated from the bilge gas. The separated ammonia gas accumulates in the upper part of the bilge tank 21 and is discharged to the outside of the bilge tank 21 through the gas discharge line 103. Therefore, even if bilge gas containing ammonia is generated inside the hull 2, the ammonia can be separated from the bilge gas. This eliminates the need to store the bilge gas while the ship 1 is sailing. This prevents the bilge tank 21 from becoming too large, and makes effective use of the space inside the hull 2.

[0033] Furthermore, in the above embodiment, the liquid treatment unit 50 separates the water and oil contained in the liquid L discharged through the liquid discharge line 104, thereby making it possible to appropriately treat the water and oil contained in the bilge.

[0034] In addition, in the above embodiment, by supplying air from the outside into the gas exhaust line 103 using the air supply unit 42, the gas A can be diluted with air, and the ammonia concentration of the gas A can be sufficiently reduced before it is released into the atmosphere.

[0035] In addition, in the above embodiment, the gas A containing ammonia gas discharged through the gas discharge line 103 is supplied to equipment installed inside the hull 2 ​​through the gas supply line 109, thereby making it possible to effectively utilize the ammonia contained in the bilge.

[0036] In addition, in the above embodiment, the bilge is heated by the heating unit 23 based on information regarding the ammonia concentration in the bilge tank 21 acquired by the information acquisition unit 31, so that the bilge can be heated at the appropriate time and the ammonia contained in the bilge can be removed from the bilge.

[0037] Furthermore, in the above embodiment, by providing the bilge recovery line 101, the bilge accumulated inside the hull 2 ​​can be sent to the bilge tank 21. As a result, even if the bilge accumulated inside the hull 2 ​​contains ammonia, the ammonia can be appropriately recovered.

[0038] (First Modification of the Embodiment) In the above embodiment, an air supply unit 42 is provided in the middle of the gas exhaust line 103, and diluted gas is sent into the gas exhaust line 103 to reduce the ammonia concentration of the gas A discharged through the gas exhaust line 103, but this is not limited to this.

[0039] FIG. 3 is a diagram illustrating a configuration of a bilge treatment facility of a ship according to a first modified example of an embodiment of the present disclosure. 3, for example, the air supply unit 43 may be provided with a fan that sends diluted gas to the upper part of the bilge tank 21. By sending diluted gas to the gas in the upper part of the bilge tank 21 by the air supply unit 43, the ammonia concentration of the gas A discharged through the gas discharge line 103 can be reduced.

[0040] (Second Modification of the Embodiment) In the above embodiment, the gas discharge line 103 discharges the gas A into the atmosphere, but this is not limiting. FIG. 4 is a diagram illustrating a configuration of a bilge treatment facility of a ship according to a second modified example of an embodiment of the present disclosure. As shown in FIG. 4, the gas discharge line 103 may be configured to discharge the gas A in the bilge tank 21 to a detoxification device 45. The detoxification device 45 detoxifies ammonia contained in the gas A discharged through the gas discharge line 103. Examples of the detoxification device 45 include a GCU (Gas Combustion Unit) and a catalytic combustion device. The detoxification device 45 may also be a so-called dilution layer in a tank (not shown) that stores fresh water or seawater as an absorbing liquid capable of absorbing ammonia. In this case, the gas A from the gas discharge line 103 is brought into contact with the absorbing liquid in the tank, thereby absorbing and diluting the ammonia contained in the gas A. The gas A that has passed through the detoxification device 45 is discharged into the atmosphere.

[0041] In this way, the ammonia contained in the gas discharged through the gas discharge line 103 is detoxified by the detoxification device 45, and the gas A can be released into the atmosphere.

[0042] (Third Modification of the Embodiment) In the above embodiment, the liquid treatment unit 50 is provided in the third branch line 108 branched off from the liquid discharge line 104 connected to the lower part of the bilge tank 21, but the present invention is not limited to this. FIG. 5 is a diagram illustrating a configuration of a bilge treatment facility of a ship according to a third modified example of an embodiment of the present disclosure. 5, a recovery line 110 for recovering oil contained in the liquid L in the bilge tank 21 may be connected to the upper layer of the liquid phase in which the liquid L is stored in the bilge tank 21. An on-off valve 110v is provided midway along the recovery line 110.

[0043] When the oil and water contained in the liquid L separate in the bilge tank 21, the oil collects in the upper layer of the liquid phase in the bilge tank 21, and the water collects in the lower layer of the liquid phase in the bilge tank 21. The oil contained in the liquid L is recovered from the bilge tank 21 through a recovery line 110. In addition, the water containing ammonia contained in the liquid L is recovered through a liquid discharge line 104 connected to the bottom of the bilge tank 21.

[0044] (Other embodiments) The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure. In the above embodiment, a pH sensor is provided as the information acquisition unit 31, but this is not limiting. Any other appropriate device can be used as the information acquisition unit 31 as long as it can acquire information related to the ammonia concentration in the bilge tank 21.

[0045] For example, when the heating section 23 heats the bilge in the bilge tank 21, the longer the time that has elapsed since the start of heating, the more ammonia is released from the bilge, and the ammonia concentration in the bilge tank 21 gradually decreases. For this reason, the information acquiring unit 31 may acquire, for example, the time that has elapsed since heating was started by the heating unit 23, as information relating to the ammonia concentration in the bilge tank 21. As a result, the heating unit 23 may heat the bilge until the time that has elapsed since heating started reaches a predetermined time that has been set in advance, and may stop heating the bilge after that time has elapsed.

[0046] Furthermore, the information acquiring unit 31 may acquire, for example, the temperature of the bilge as information relating to the ammonia concentration in the bilge tank 21. This allows the heating unit 23 to heat the bilge from the start of heating until the bilge reaches a predetermined temperature, and to stop heating the bilge after the temperature is reached.

[0047] Furthermore, if the ammonia concentration of the bilge in the bilge tank 21 can be sufficiently reduced by heating the bilge with the heating unit 23, the information acquisition unit 31 may be omitted.

[0048] Furthermore, with respect to each configuration shown in the above embodiment, some configurations may be omitted or other configurations may be added as appropriate, within the scope of the gist of the present invention.

[0049] <Additional Notes> The ship 1 described in each embodiment can be understood, for example, as follows.

[0050] (1) A ship 1 according to a first aspect includes a hull 2, ammonia-related equipment 10 provided in the hull 2, a bilge tank 21 for storing bilge generated within the hull 2, a liquid discharge line 104 connected to the bilge tank 21 and capable of discharging liquid from the bilge tank 21, a gas discharge line 103 connected to the top of the bilge tank 21 and capable of discharging gas from the bilge tank 21, and a heating unit 23 capable of heating the bilge in the bilge tank 21. Examples of the ammonia-related facility 10 include an ammonia storage tank that stores ammonia, equipment that uses ammonia as fuel, and a piping system through which ammonia flows.

[0051] As a result, when the bilge in the bilge tank 21 is heated by the heating unit 23, if the bilge contains ammonia, the ammonia vaporizes and separates from the bilge. The separated ammonia rises in the bilge and is discharged from the top of the bilge tank 21 to the outside of the bilge tank 21 through the gas discharge line 103. As a result of the separation of the ammonia, the liquid L, whose ammonia concentration has decreased, is discharged from the bilge tank 21 through the liquid discharge line 104. In this way, even if bilge containing ammonia is generated inside the hull 2, the ammonia can be separated from the bilge, so there is no need to store the bilge while the ship 1 is sailing. This prevents the bilge tank 21 from becoming too large, and makes it possible to make effective use of the space inside the hull 2.

[0052] (2) The ship 1 according to the second aspect is the ship 1 of (1), further comprising a liquid treatment unit 50 that separates water and oil contained in the liquid discharged through the liquid discharge line 104.

[0053] As a result, the liquid treatment unit 50 separates the water and oil contained in the liquid discharged through the liquid discharge line 104, thereby making it possible to appropriately treat the water and oil.

[0054] (3) The ship 1 according to the third aspect is the ship 1 of (1) or (2), further comprising an air supply unit 42, 43 that supplies air from the outside into the gas discharge line 103 or the bilge tank 21.

[0055] As a result, if the gas in the bilge tank 21 contains ammonia, the ammonia concentration can be diluted by supplying air from the outside through the air supply units 42 and 43 into the gas discharge line 103 or the bilge tank 21. This allows the gas in the bilge tank 21 to be released into the atmosphere.

[0056] (4) The ship 1 according to the fourth aspect is any one of the ships 1 of (1) to (3), and further includes a detoxification device 45 for detoxifying ammonia contained in the gas discharged through the gas discharge line 103.

[0057] As a result, the ammonia contained in the gas discharged through the gas discharge line 103 can be detoxified by the detoxification device 45, and the gas can be released into the atmosphere.

[0058] (5) The ship 1 according to the fifth aspect is any one of the ships 1 of (1) to (4), further comprising a gas supply line 109 that supplies the gas containing ammonia discharged through the gas discharge line 103 to equipment installed within the hull 2.

[0059] As a result, the gas containing ammonia discharged through the gas discharge line 103 can be supplied to equipment installed inside the hull 2 ​​through the gas supply line 109, making it possible to effectively utilize the ammonia contained in the bilge.

[0060] (6) The ship 1 according to the sixth aspect is any one of the ships 1 of (1) to (5), and further includes an information acquisition unit 31 that acquires information regarding the ammonia concentration in the bilge tank 21, and the heating unit 23 heats the bilge based on the information regarding the ammonia concentration acquired by the information acquisition unit 31.

[0061] As a result, by heating the bilge with the heating unit 23 based on information regarding the ammonia concentration in the bilge tank 21 acquired by the information acquisition unit 31, the bilge can be heated at the appropriate time and the ammonia contained in the bilge can be removed from the bilge. Examples of information relating to the ammonia concentration include the pH of the bilge, the heating time of the bilge by the heating unit 23, and the temperature of the bilge.

[0062] (7) The ship 1 according to the seventh aspect is any one of the ships 1 of (1) to (6), and further includes a bilge recovery line 101 that recovers the bilge accumulated within the hull 2 ​​and sends it to the bilge tank 21.

[0063] This allows the bilge water accumulated inside the hull 2 ​​to be sent to the bilge tank 21 through the bilge recovery line 101. This allows the ammonia to be appropriately recovered if the bilge water accumulated inside the hull 2 ​​contains ammonia. [Explanation of symbols]

[0064] 1...Ship 2...Hull 2a…bow 2d…Bottom part 3A, 3B...Side 4... Bottom of the ship 5...Upper deck 7...Superstructure 10...Ammonia-related facilities 15…Bilgewell 20...Bilge treatment facility 21...bilge tank 22...Bilge pump 23...Heating part 24...Heating unit main body 25...Controller 31…Information acquisition department 41...Gas detector 42, 43...Air supply section 45...Abatement device 50...Liquid processing unit 101...Bilge recovery line 103...Gas exhaust line 104...Liquid discharge line 104v...Shut-off valve 106...First branch line 106v...Shut-off valve 107...Second branch line 107v...Shut-off valve 108...Third branch line 108v...Shut-off valve 109...Gas supply line A...gas L…liquid

Claims

1. The hull and ammonia-related equipment installed in the hull; a bilge tank for storing bilge generated within the hull; a liquid discharge line connected to the bilge tank and capable of discharging liquid from the bilge tank; a gas discharge line connected to an upper portion of the bilge tank and capable of discharging gas from the bilge tank; a heating unit capable of heating the bilge in the bilge tank; A vessel equipped with:

2. a liquid treatment unit that separates water and oil contained in the liquid discharged through the liquid discharge line.

2. The watercraft of claim 1.

3. an air supply unit that supplies air from the outside into the gas discharge line or the bilge tank.

3. A vessel according to claim 1 or 2.

4. The system further includes a detoxification device that detoxifies ammonia contained in the gas discharged through the gas discharge line.

3. A vessel according to claim 1 or 2.

5. a gas supply line that supplies the gas containing ammonia discharged through the gas discharge line to equipment provided in the hull.

3. A vessel according to claim 1 or 2.

6. an information acquisition unit that acquires information about the ammonia concentration in the bilge tank; The heating unit heats the bilge based on information about the ammonia concentration acquired by the information acquisition unit.

3. A vessel according to claim 1 or 2.

7. The ship further includes a bilge recovery line that recovers the bilge accumulated in the hull and sends it to the bilge tank.

3. A vessel according to claim 1 or 2.

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