Vessel

Abstract

To further suppress gas discharged into the atmosphere from intruding into an internal space of a hull, an upper structure, etc.SOLUTION: A vessel includes: a hull; a tank provided in the hull and capable of retaining liquefied gas; and a vent post provided in the hull, connected to a circulation pass communicating with the tank, and discharging fluid introduced from a lower part into the atmosphere in a gas state from an upper part. The vent post has: a lower cylindrical body extending upward from the hull; and an upper cylindrical body capable of moving relatively against the lower cylindrical body between a first position extending upward from the lower cylindrical body and a second position in which an upper end is located below the first position.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] A vent post is provided in a ship carrying fuel for ship propulsion or flammable gas as cargo to release the flammable gas into the atmosphere outside the ship. Even when a liquefied gas such as ammonia is carried as fuel for ship propulsion or cargo, it is possible that the vaporized liquefied gas will be released into the atmosphere through the vent post if the pressure of the liquefied gas increases excessively. However, since ammonia, for example, is highly toxic, measures must be taken to prevent the ammonia released into the atmosphere from entering the internal space of the hull, superstructure, etc. For example, Patent Document 1 discloses a configuration including a vent post body that is cylindrical and extends vertically and that releases ammonia introduced from the bottom into the atmosphere from the top, and a heating unit that heats the vent post body in the vertical direction. In Patent Document 1, the temperature drop of ammonia passing through the vent post body is suppressed, thereby increasing the diffusibility of ammonia released from the vent post into the atmosphere. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-30147 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since gas released into the atmosphere from the vent post may infiltrate into the internal spaces of the hull, superstructure, etc., it is desirable to further prevent such gas from infiltrating into the internal spaces of the hull, superstructure, etc.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a ship that can further prevent gas released into the atmosphere from the vent post from entering the internal spaces of the hull, superstructure, etc. [Means for solving the problem]

[0006] In order to solve the above problems, the ship according to the present disclosure includes a hull, a tank, and a vent post. The tank is provided in the hull and is capable of storing liquefied gas. The vent post is provided in the hull and is connected to a flow path communicating with the tank. The vent post releases fluid introduced from a lower portion into the atmosphere in a gaseous state from an upper portion. The vent post has a lower cylindrical body and an upper cylindrical body. The lower cylindrical body extends upward from the hull. The upper cylindrical body is movable relative to the lower cylindrical body between a first position extending upward from the lower cylindrical body and a second position in which an upper end of the upper cylindrical body is located lower than the first position. Effect of the Invention

[0007] According to the ship disclosed herein, it is possible to further prevent gas released into the atmosphere from the vent post from entering the internal spaces of the hull, superstructure, etc. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of a vessel equipped with a vessel according to a first embodiment of the present disclosure. [Diagram 2] FIG. 2 is a diagram showing a configuration of a vent post provided in the marine vessel according to the first embodiment of the present disclosure. [Diagram 3] FIG. 11 is a diagram showing a state in which an upper cylinder body of a vent post is placed in a second position in the marine vessel according to the first embodiment of the present disclosure. [Figure 4] FIG. 11 is a side view of a vessel equipped with a vessel according to a second embodiment of the present disclosure. [Diagram 5] FIG. 11 is a diagram showing a configuration of a vent post provided in a vessel according to a second embodiment of the present disclosure. [Figure 6] A figure showing the upper cylinder body of the vent post according to the second embodiment of the present disclosure placed in a second position. [Figure 7] 1 is a diagram showing a state in which an upper cylinder body of a vent post is placed in a second position in a marine vessel according to a first embodiment of the present disclosure. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] First Embodiment Hereinafter, a vessel according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 7. FIG. (Vessel configuration) As shown in Fig. 1, the ship 1A of this embodiment includes a hull 2, a superstructure 4, a tank 10, and a vent post 20. Note that the ship 1A of this embodiment will be described as an example of a ship that can navigate using a main engine or the like. The type of ship 1A is not limited to a specific type of ship. Examples of the type of ship 1A include a liquefied gas carrier, a ferry, a RORO ship, a car carrier, and a passenger ship.

[0010] The hull 2 ​​is formed to float on seawater. The hull 2 ​​has a pair of side panels 5A, 5B that form its outer hull, and a ship bottom 6. The side panels 5A, 5B each have a pair of side shell plates that form the starboard and port sides, respectively. The ship bottom 6 has a ship bottom shell plate that connects the side panels 5A, 5B.

[0011] The hull 2 ​​further includes an upper deck 7, which is a full-length deck located at the topmost level. The superstructure 4 is formed on this upper deck 7. The superstructure 4 includes a superstructure main body 4a in which accommodation areas and the like are provided, and ancillary equipment 4b provided on the superstructure main body 4a. Examples of the ancillary equipment 4b include radar and communication antennas. In the ship 1A of this embodiment, for example, a cargo space 8 for carrying cargo is provided closer to the bow 2a in the bow-stern direction FA than the superstructure 4.

[0012] The tank 10 is provided in the hull 2. The tank 10 is provided in the cargo space 8 inside the hull 2. In this embodiment, multiple tanks 10 are provided at intervals in the bow-stern direction FA. In this embodiment, three tanks 10 are provided at intervals in the bow-stern direction FA. The number, arrangement, shape, etc. of the tanks 10 are not limited in any way and can be changed as appropriate. Each tank 10 can store ammonia, for example, as a liquefied gas.

[0013] The vent post 20 is provided on the upper deck 7. The vent post 20 is connected to the tank 10 via a connecting pipe 15. The connecting pipe 15 forms an ammonia flow path that communicates with the tank 10. A safety valve 18 is provided in the middle of the connecting pipe 15. The safety valve 18 is normally closed and blocks the ammonia flow path in the connecting pipe 15. When the ammonia pressure in the ammonia flow path in the connecting pipe 15 becomes equal to or greater than a preset specified value, the safety valve 18 opens and opens the ammonia flow path in the connecting pipe 15. When the safety valve 18 is opened, ammonia is released to the vent post 20 through the connecting pipe 15. In addition, the safety valve 18 returns to a closed state when the ammonia pressure in the ammonia flow path in the connecting pipe 15 becomes less than a preset specified value.

[0014] FIG. 2 is a diagram showing a configuration of a vent post provided in the vessel according to the first embodiment of the present disclosure. The vent post 20 is formed in a cylindrical shape extending in the vertical direction Dv. Ammonia (fluid) discharged from the tank 10 via the safety valve 18 is introduced into the vent post 20 from the lower part. The ammonia introduced into the lower part of the vent post 20 is not limited to gas, and may include liquid. The vent post 20 releases the introduced ammonia in a gaseous state into the atmosphere from the upper part. As shown in FIG. 2, the vent post 20 has a lower cylindrical body 21 and an upper cylindrical body 22.

[0015] The lower cylindrical body 21 extends upward from the hull 2. The lower cylindrical body 21 is fixed onto the upper deck 7. The lower cylindrical body 21 is formed in a tubular shape extending in the up-down direction Dv. The lower cylindrical body 21 is, for example, cylindrical.

[0016] The upper cylinder body 22 is formed in a tubular shape extending in the up-down direction Dv. The upper cylinder body 22 is, for example, cylindrical. In the embodiment of the present disclosure, the upper cylinder body 22 has an inner diameter larger than the outer diameter of the lower cylinder body 21. The upper cylinder body 22 is disposed radially outward of the lower cylinder body 21. In the present embodiment, the central axis (not shown) of the upper cylinder body 22 overlaps with the central axis (not shown) of the lower cylinder body 21 when viewed from above.

[0017] A rain catcher 23 is provided on the upper part of the upper cylindrical body 22. The rain catcher 23 is disposed inside an opening 22a formed at the upper end 22t of the upper cylindrical body 22. The rain catcher 23 receives water such as rainwater that enters the upper cylindrical body 22 from the opening 22a during rainy weather. The rain catcher 23 of this embodiment is shaped like a funnel, the diameter of which narrows as it approaches the bottom in the vertical direction Dv. A drain pipe 24 is connected to the rain catcher 23. The drain pipe 24 discharges the water received in the rain catcher 23 to the outside of the upper cylindrical body 22. By discharging the water received in the rain catcher 23 by the drain pipe 24 to the outside of the upper cylindrical body 22 in this way, ammonia is dissolved in the water that has entered the inside of the vent post 20 from the opening 22a of the upper cylindrical body 22, and the ammonia water is prevented from remaining inside the vent post 20.

[0018] An annular sealing member 25 is provided between the upper cylindrical body 22 and the lower cylindrical body 21. The annular sealing member 25 prevents leakage of ammonia and intrusion of rainwater and the like from the outside through the gap between the upper cylindrical body 22 and the lower cylindrical body 21.

[0019] FIG. 3 is a diagram showing a state in which an upper cylinder body of a vent post is placed in a second position in the marine vessel according to the first embodiment of the present disclosure. The upper cylinder body 22 is movable relative to the lower cylinder body 21 in the up-down direction Dv. The upper cylinder body 22 is movable relative to the lower cylinder body 21 between a first position P1 at which the upper cylinder body 22 extends upward from the lower cylinder body 21 as shown in Figs. 1 and 2, and a second position P2 at which an upper end 22t is located lower than the first position P1 as shown in Fig. 3.

[0020] As shown in Fig. 1, when the upper cylindrical body 22 is disposed at the first position P1, the upper end 22t of the upper cylindrical body 22 is located above the upper end 4t of the upper structure 4. As shown in Fig. 3, when the upper cylindrical body 22 is located at the second position P2, the upper end 22t of the upper cylindrical body 22 and the upper end 21t of the lower cylindrical body 21 are located at a height equal to or higher than the upper structure main body 4a.

[0021] As shown in FIG. 2, the vent post 20 of this embodiment is provided with a drive mechanism 27 that moves the upper cylinder 22 between the first position P1 and the second position P2. An example of the drive mechanism 27 is a hydraulic cylinder 28. The hydraulic cylinder 28 has a base end connected to the upper deck 7 and a tip end connected to the upper cylinder 22 via a bracket 29. The hydraulic cylinder 28 is hydraulically driven to extend and retract, and raises and lowers the upper cylinder 22 in the vertical direction. It is preferable that a plurality of hydraulic cylinders 28 are arranged in parallel in order to stably raise and lower the upper cylinder 22. In addition, since the inside of the vent post 20 is an ammonia atmosphere, which is a corrosive gas, it is preferable that the hydraulic cylinder 28 is arranged outside the vent post 20. In addition, in case of a malfunction in the hydraulic system of the hydraulic cylinder 28, it is preferable that the upper cylinder 22 is provided with a fixing member (not shown) such as a pin so that the position can be fixed when the upper cylinder 22 is arranged at the first position P1. Such hydraulic cylinders 28 and fixing members such as pins are operated by remote control by an operator.

[0022] 1, the upper cylindrical body 22 is disposed in a first position P1 during normal navigation. As a result, the upper end 22t of the upper cylindrical body 22 is located above the upper end 4t of the superstructure 4, so that the intrusion of ammonia into the hull 2 ​​and the accommodation space in the superstructure main body 4a of the superstructure 4 is suppressed. Also, as shown in FIG. 3, when the ship 1A passes under a structure 100 with a height restriction, the upper cylindrical body 22 is lowered by the drive mechanism 27 and disposed at the second position P2. An example of the structure 100 with a height restriction is a bridge girder. This suppresses interference between the vent post 20 and the structure 100. In this case, when the upper cylindrical body 22 is disposed at the second position P2, the upper end 22t of the upper cylindrical body 22 and the upper end 21t of the lower cylindrical body 21 are disposed at a height equal to or higher than the upper structure main body 4a. Therefore, even when the upper cylindrical body 22 is disposed at the second position P2, the intrusion of ammonia into the living space in the upper structure main body 4a is suppressed.

[0023] (Action and effect) In the ship 1A of the first embodiment, the upper cylinder 22 of the vent post 20 is movable relative to the lower cylinder 21 between a first position P1 extending upward from the lower cylinder 21 and a second position P2 where the upper end 22t is located lower than the first position P1. In general, the height of the vent post is set so as not to interfere with the structure 100 through which the ship passes. In contrast, by making the upper cylinder 22 movable relative to the lower cylinder 21 between the first position P1 and the second position P2, for example, when the ship 1A passes under the structure 100, the upper cylinder 22 can be positioned at the second position P2. This prevents the vent post 20 from interfering with the structure 100. Furthermore, during normal navigation when the ship 1A does not pass under the structure 100, the upper cylindrical body 22 is positioned at the first position P1 extending upward from the lower cylindrical body 21, so that the upper end 22t of the vent post 20 can be positioned at a higher position without considering interference with the structure 100. As a result, ammonia released into the atmosphere can be further prevented from entering the internal spaces of the hull 2, the superstructure 4, etc.

[0024] Furthermore, in the above first embodiment, when the upper cylindrical body 22 is positioned at the first position P1, the upper end 22t of the upper cylindrical body 22 is positioned above the upper end 4t of the upper structure 4, thereby further preventing ammonia released into the atmosphere from entering the internal space of the upper structure 4.

[0025] In addition, in the first embodiment, when the upper cylindrical body 22 is located at the second position P2, the upper end 22t of the upper cylindrical body 22 and the upper end 21t of the lower cylindrical body 21 are located at a height equal to or higher than the upper structure main body 4a. As a result, when the ship 1A passes under the structure 100, even when the upper cylindrical body 22 is located at the second position P2, ammonia discharged into the atmosphere is prevented from entering the internal space of the upper structure main body 4a.

[0026] In the first embodiment, when the ship 1A is navigating normally, the upper cylindrical body 22 is disposed at the first position P1, and when the ship 1A passes under a structure 100 with a height restriction, the upper cylindrical body 22 is disposed at the second position P2, thereby suppressing interference between the vent post 20 and the structure 100. This makes it possible to further suppress ammonia released into the atmosphere from entering the internal space of the hull 2, superstructure 4, etc. during normal navigation other than when the ship 1A passes under a structure 100 with a height restriction.

[0027] In the first embodiment, the upper cylindrical body 22 is made movable relative to the lower cylindrical body 21 in the vertical direction Dv, thereby allowing the vent post 20 to expand and contract in the vertical direction Dv. This allows the height of the vent post 20 to be adjusted. Therefore, during normal navigation, the upper cylindrical body 22 is placed at the first position P1 and the vent post 20 is in an extended state, and when passing under a structure 100 with a height restriction, the upper cylindrical body 22 is placed at the second position P2 and the vent post 20 is in a retracted state.

[0028] In the first embodiment, an annular seal member 25 is disposed between the upper cylinder 22 and the lower cylinder 21. This prevents leakage of ammonia released into the atmosphere through the gap between the upper cylinder 22 and the lower cylinder 21, and prevents infiltration of rainwater from the outside.

[0029] In the first embodiment, the upper cylinder body 22 is moved between the first position P1 and the second position P2 by the driving mechanism 27. This makes it possible to easily adjust the height of the vent post 20.

[0030] (Modification of the first embodiment) In the first embodiment, the lower cylinder 21 and the upper cylinder 22 are cylindrical, but are not limited to this. The lower cylinder 21 and the upper cylinder 22 may be rectangular or rectangular tubular. In addition, in the first embodiment, the upper cylindrical body 22 is arranged radially outward of the lower cylindrical body 21, but this is not limited to the above. The upper cylindrical body 22 may be arranged radially inward of the lower cylindrical body 21.

[0031] In the first embodiment, the vent post 20 is configured to be extendable in two stages, including the lower cylindrical body 21 and the upper cylindrical body 22, but may be configured to be extendable in three or more stages. In the first embodiment, the upper cylinder body 22 is configured to be movable up and down between the first position P1 and the second position P2, but this is not limited thereto. The drive mechanism 27 may be configured to position the upper cylinder body 22 at any position between the first position P1 and the second position P2.

[0032] In the first embodiment, the hydraulic cylinder 28 is exemplified as the drive mechanism 27, but the present invention is not limited to this. As the drive mechanism 27, other than the hydraulic cylinder 28, for example, a linear gear mechanism using a rack gear and a pinion gear, a mechanism for winding up a wire having one end engaged with the upper cylinder body 22, etc. can be used.

[0033] Second Embodiment Next, a second embodiment of the vessel according to the present disclosure will be described. In the second embodiment described below, the only difference from the first embodiment is the configuration of the vent post, so the same parts as in the first embodiment are denoted by the same reference numerals and will not be described again. FIG. 4 is a side view of a vessel equipped with a vessel according to a second embodiment of the present disclosure. As shown in FIG. 4, a ship 1B of the second embodiment includes a hull 2, a superstructure 4, a tank 10, and a vent post 30.

[0034] The vent post 30 is provided on the upper deck 7. The vent post 30 is connected to the tank 10 via a connecting pipe 15. The vent post 30 is formed in a cylindrical shape extending in the vertical direction Dv. Ammonia discharged from the tank 10 via the safety valve 18 is introduced into the vent post 30 from the lower part. The vent post 30 guides the introduced ammonia to the upper part and releases it into the atmosphere from the upper part.

[0035] Fig. 5 is a diagram showing a configuration of a vent post provided in a vessel according to a second embodiment of the present disclosure, and Fig. 6 is a diagram showing a state in which an upper cylinder body of the vent post according to the second embodiment of the present disclosure is disposed in a second position. As shown in FIGS. 5 and 6, the vent post 30 has a lower cylindrical body 31 and an upper cylindrical body 32. The lower cylindrical body 31 extends upward from the hull 2. The lower cylindrical body 31 is fixed onto the upper deck 7. The lower cylindrical body 31 is formed in a tubular shape extending in the up-down direction Dv. The lower cylindrical body 31 is, for example, cylindrical. In the second embodiment, a rain catcher 23 is provided on the upper part of the lower cylindrical body 31. A drain pipe 24 is connected to the rain catcher 23.

[0036] The upper cylinder 32 is formed in a tubular shape extending in the vertical direction Dv. The upper cylinder 32 is, for example, cylindrical. A rain catch 23 is provided on the upper part of the upper cylinder 32, similar to the upper part of the lower cylinder 31. A drain pipe 24 is connected to the rain catch 23.

[0037] The lower end of the upper cylinder 32 is connected to the upper end of the lower cylinder 31. Specifically, the edge of the lower end of the upper cylinder 32 and the edge of the upper end of the lower cylinder 31 are connected via a hinge mechanism 33 having a connecting shaft extending horizontally. The upper cylinder 32 is movable relative to the lower cylinder 31 between a first position P11 extending upward from the lower cylinder 31 as shown in FIG. 5 and a second position P12 tilted to the side with respect to the lower cylinder 31 as shown in FIG. 6. In other words, the upper cylinder 32 is supported so as to be swingable between the first position P11 and the second position P12 with respect to the lower cylinder 31. It is preferable to provide an appropriate mechanism for locking the upper cylinder 32 so that it does not fall when the upper cylinder 32 is in the first position P11.

[0038] The upper end 32t of the upper cylinder 32 in the second position P12 is located lower than the upper end 32t of the upper cylinder 32 in the first position P11. In this second embodiment, the upper cylinder 32 in the second position P12 is in a state in which it is laterally inclined with respect to the lower cylinder 31, for example, at an angle θ=90°. The angle θ at which the upper cylinder 32 is inclined in the second position P12 is not limited to 90°. The angle θ at which the upper cylinder 32 is inclined in the second position P12 may be any other angle as long as the upper cylinder 32 is inclined laterally with respect to the lower cylinder 31. In addition, the direction in which the upper cylinder 32 is inclined in the second position P12 may be the direction to be laterally in relation to the lower cylinder 31 extending in the vertical direction, and may be inclined in the bow-stern direction FA or in the width direction with respect to the hull 2.

[0039] FIG. 7 is a diagram showing a state in which the upper cylinder body of the vent post is placed in a second position in a marine vessel according to a second embodiment of the present disclosure. As shown in FIG. 4, when the upper cylindrical body 32 is disposed in the first position P11, the upper end 32t of the upper cylindrical body 32 is located above the upper end 4t of the upper structure 4. Furthermore, as shown in FIG. 7, when the upper cylinder body 32 is disposed in the second position P12, the upper end 31t of the lower cylinder body 31 is located at a height equal to or higher than the upper structure main body 4a.

[0040] As shown in FIG. 5 and FIG. 6, the vent post 30 of the second embodiment includes a drive mechanism 37 that moves the upper cylinder body 32 between the first position P11 and the second position P12. An example of the drive mechanism 37 is a hydraulic cylinder 38. The hydraulic cylinder 38 has a base end 38a rotatably connected to the upper deck 7 and a tip end 38b rotatably connected to a bracket 32b provided on the upper cylinder body 32. The bracket 32b extends from the lower part of the upper cylinder body 32 toward the outer periphery of the upper cylinder body 32. The hydraulic cylinder 38 is hydraulically driven to extend and retract, and rotates the upper cylinder body 32 around the connecting shaft of the hinge mechanism 33. Such a hydraulic cylinder 38 is operated by remote control by an operator. Since the inside of the vent post 30 is an atmosphere of ammonia, which is a corrosive gas, it is preferable to dispose the hydraulic cylinder 38 outside the vent post 30. In addition, a support member 50 may be provided that supports the upper cylinder body 32 from below when the upper cylinder body 32 is disposed in a tilted state in the second position P12.

[0041] 4, the upper cylindrical body 32 is disposed in a first position P11 during normal navigation. As a result, the upper end 32t of the upper cylindrical body 32 is positioned higher than the upper end 4t of the superstructure 4, so that the intrusion of ammonia into the hull 2 ​​and the accommodation space in the superstructure main body 4a of the superstructure 4 is suppressed. 7, when the ship 1B passes under a structure 100 with a height restriction, the upper cylinder 32 is tilted laterally relative to the lower cylinder 31 by the drive mechanism 37 and disposed at the second position P12. This prevents interference between the vent post 30 and the structure 100. In this case, when the upper cylinder 32 is disposed at the second position P12, the upper end 31t of the lower cylinder 31 is disposed at a height equal to or higher than the upper structure main body 4a, so that ammonia discharged from the upper end 31t of the lower cylinder 31 into the atmosphere is prevented from entering the living space in the upper structure main body 4a. In addition, a rain catcher 23 is provided at the upper part of the lower cylinder 31, so that the intrusion of water such as rainwater into the lower cylinder 31 is prevented.

[0042] (Action and effect) In the ship 1B of the second embodiment, as in the first embodiment, the upper cylindrical body 32 of the vent post 30 is movable relative to the lower cylindrical body 31 between a first position P11 extending upward from the lower cylindrical body 31 and a second position P12 in which the upper end 32t is located lower than the first position P11. As a result, for example, when the ship 1B passes under the structure 100, the upper cylindrical body 32 is positioned at the second position P12 to prevent the vent post 30 from interfering with the structure 100. In addition, during normal navigation in which the ship 1B does not pass under the structure 100, the upper cylindrical body 32 is positioned at the first position P11 extending upward from the lower cylindrical body 31, so that the upper end 32t of the vent post 30 can be positioned at a higher position. As a result, it is possible to further prevent ammonia discharged into the atmosphere from entering the internal space of the hull 2, the superstructure 4, etc.

[0043] In the second embodiment, the lower end of the upper cylindrical body 32 is rotatably connected to the upper end of the lower cylindrical body 31, so that the vent post 30 is bent at the middle in the vertical direction Dv. This allows the height of the vent post 30 to be adjusted. Therefore, during normal navigation, the upper cylindrical body 32 can be placed at the first position P11, and the vent post 30 can be stretched in the vertical direction Dv. When passing under a structure 100 with a height restriction, the upper cylindrical body 32 can be placed at the second position P12, and the upper cylindrical body 32 can be tilted to the side relative to the lower cylindrical body 31, thereby reducing the height of the vent post 30.

[0044] (Modification of the second embodiment) In the second embodiment, similarly to the first embodiment, the lower cylinder 31 and the upper cylinder 32 are cylindrical, but are not limited thereto. The lower cylinder 31 and the upper cylinder 32 may be rectangular tubular, etc. When the lower cylinder 31 and the upper cylinder 32 are rectangular tubular, it is preferable that the connecting shaft of the hinge mechanism 33 is disposed along one side of the lower cylinder 31 and the upper cylinder 32.

[0045] (Other embodiments) Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not depart from the gist of the present disclosure are also included. In each of the above embodiments, the tank 10 is configured to store ammonia as cargo, but is not limited to this. The tank 10 may be a fuel tank for a combustion device (not shown) that uses ammonia as fuel. The combustion device is a device that generates thermal energy by burning fuel, and is provided inside the hull 2. Examples of the combustion device include an internal combustion engine used in the main engine for propelling the hull, an internal combustion engine used in a power generation facility that supplies electricity to the inside of the ship, and a boiler that generates steam as a working fluid.

[0046] In addition, in each of the above embodiments, the tank 10 is provided in the cargo space 8 inside the hull 2, but this is not limited to the above. The tank 10 may be provided on the upper deck 7, for example. In addition, in each of the above embodiments, the vent post 20 is connected to the tank 10 via the connecting pipe 15 having the safety valve 18 provided thereon, but this is not limited to the above. For example, when the tank 10 is a fuel tank for a combustion device that uses ammonia as fuel, ammonia as fuel is supplied from the tank 10 to the combustion device via a fuel supply device. In this case, the connecting pipe 15 does not include the safety valve 18, and the ammonia is discharged from the tank 10 to the vent post 20 via the fuel supply device and its associated devices.

[0047] In the second embodiment, the lower end of the upper cylinder body 32 and the upper end of the lower cylinder body 31 are separated along a horizontal plane, but this is not limited thereto. The lower end of the upper cylinder body 32 and the upper end of the lower cylinder body 31 may be separated along a plane that is inclined with respect to the horizontal plane, making it easier to tilt the upper cylinder body 32 from the first position P11 to the second position P12, or making it harder for the upper cylinder body 32 to tilt from the first position P11.

[0048] In addition, in each of the above embodiments, ammonia has been exemplified as the liquefied gas stored in the tank 10, but this is not limited thereto. The liquefied gas stored in the tank 10 may be, for example, liquefied natural gas, liquefied petroleum gas, liquefied carbon dioxide, etc.

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

[0050] (1) A ship 1A, 1B in a first embodiment comprises a hull 2, a tank 10 provided in the hull 2 ​​and capable of storing liquefied gas, and a vent post 20, 30 provided in the hull 2 ​​and connected to a flow path communicating with the tank 10, for discharging a fluid introduced from a lower part into the atmosphere in a gaseous state from an upper part, and the vent post 20, 30 has a lower cylindrical body 21, 31 extending upward from the hull 2, and an upper cylindrical body 22, 32 that is movable relative to the lower cylindrical body 21, 31 between a first position P1, P11 extending upward from the lower cylindrical body 21, 31 and a second position P2, P12 whose upper end is located lower than the first position P1, P11.

[0051] Thereby, for example, when the ships 1A, 1B pass under the structure 100, by positioning the upper cylindrical bodies 22, 32 at the second positions P2, P12, interference of the vent posts 20, 30 with the structure 100 is suppressed. Also, during normal navigation when the ships 1A, 1B do not pass under the structure 100, by positioning the upper cylindrical bodies 22, 32 at the first positions P1, P11 extending upward from the lower cylindrical bodies 21, 31, the upper ends of the vent posts 20, 30 can be positioned at a higher position without considering interference with the structure 100. As a result, it is possible to further suppress the gas released into the atmosphere from entering the internal space of the hull 2, the superstructure 4, etc.

[0052] (2) The ships 1A, 1B of the second aspect are the ships 1A, 1B of (1), wherein the hull 2 ​​comprises a pair of ship sides 5A, 5B, an upper deck 7, and a superstructure 4 having living space provided on the upper deck 7, and when the upper cylindrical bodies 22, 32 are positioned at the first positions P1, P11, the upper ends 22t, 32t of the upper cylindrical bodies 22, 32 are positioned above the upper end 4t of the superstructure 4.

[0053] This makes it possible to further prevent gas released into the atmosphere from entering the internal space of the upper structure 4.

[0054] (3) The ships 1A, 1B in the third aspect are the ships 1A, 1B of (1) or (2), wherein the superstructure 4 comprises a superstructure main body 4a having the accommodation area and ancillary equipment 4b provided on the superstructure main body 4a, and when the upper cylinder bodies 22, 32 are positioned at the second positions P2, P12, the upper ends 21t, 31t of the lower cylinder bodies 21, 31 are positioned at a height equal to or higher than the superstructure main body 4a.

[0055] As a result, when the ships 1A, 1B pass under the structure 100, even when the upper cylinders 22, 32 are positioned at the second positions P2, P12, gas released into the atmosphere from the upper ends 21t, 31t of the lower cylinders 21, 31 is prevented from entering the internal space of the upper structure main body 4a.

[0056] (4) The ships 1A, 1B in the fourth aspect are any one of the ships 1A, 1B of (1) to (3), and the upper cylinder 22, 32 is disposed at the first position P1, P11 during normal navigation, and is disposed at the second position P2, P12 when passing under a structure 100 with a height restriction.

[0057] This makes it possible to suppress interference between the vent posts 20, 30 and the structure 100. Furthermore, during normal navigation except when the ships 1A, 1B pass under the structure 100 that has a height restriction, it is possible to further prevent gas released into the atmosphere from entering the internal spaces of the hull 2, superstructure 4, etc.

[0058] (5) The ship 1A in the fifth aspect is any one of the ships 1A of (1) to (4), wherein the upper cylindrical body 22 is arranged radially outside or inside the lower cylindrical body 21 and is movable relative to the lower cylindrical body 21 in the vertical direction.

[0059] This makes it possible to adjust the height of the vent post 20. Therefore, during normal navigation, the upper cylindrical body 22 is placed at the first position P1 and the vent post 20 is in an extended state, and when passing under a structure 100 with a height restriction, the upper cylindrical body 22 is placed at the second position P2 and the vent post 20 is in a retracted state.

[0060] (6) The vessel 1A according to a sixth aspect is the vessel 1A of (5), further including an annular seal member 25 disposed between the upper cylindrical body 22 and the lower cylindrical body 21.

[0061] This prevents leakage of gas released into the atmosphere from between the upper cylinder 22 and the lower cylinder 21, and prevents infiltration of rainwater from the outside.

[0062] (7) The ship 1B in the seventh aspect is any one of the ships 1B of (1) to (4), wherein the lower end of the upper cylindrical body 32 is rotatably connected to the upper end of the lower cylindrical body 31, and the upper cylindrical body 32 is in a state of being tilted laterally relative to the lower cylindrical body 31 at the second position P12.

[0063] This allows adjustment of the height of the vent post 30. Therefore, during normal navigation, the upper cylindrical body 32 can be placed at the first position P11, and the vent post 30 can be extended in the vertical direction Dv. When passing under a structure 100 with a height restriction, the upper cylindrical body 32 can be placed at the second position P12, and can be tilted to the side relative to the lower cylindrical body 31, thereby reducing the height of the vent post 30.

[0064] (8) The ships 1A, 1B of the eighth aspect are any one of the ships 1A, 1B of (1) to (7), and further include a drive mechanism 27 that moves the upper cylinder body 22, 32 between the first position P1, P11 and the second position P2, P12. Examples of the drive mechanism 27 include a hydraulic cylinder and a linear gear mechanism.

[0065] This allows the height of the vent posts 20, 30 to be easily adjusted. [Explanation of symbols]

[0066] DESCRIPTION OF SYMBOLS 1A, 1B... Ship 2... Hull 2a... Bow 4... Superstructure 4a... Superstructure body 4b... Auxiliary equipment 4t... Upper end 5A, 5B... Ship side 6... Ship bottom 7... Upper deck 8... Cargo space 10... Tank 15... Connecting pipe 18... Safety valve 20... Vent post 21... Lower cylinder 21t... Upper end 22... Upper cylinder 22a... Opening 22t... Upper end 23... Rain catcher 24... Drain pipe 25... Seal member 27, 37... Drive mechanism 28, 38... Hydraulic cylinder 29... Bracket 30... Vent post 31... Lower cylinder 31t... Upper end 32... Upper cylinder 32b... Bracket 32t... Upper end 33... Hinge mechanism 38a... Base end 38b... Tip 50... Support member 100...Structure P1, P11...First position P2, P12...Second position

Claims

1. The hull and A tank provided in the hull and capable of storing liquefied gas; A vent post is provided in the hull, connected to a flow path communicating with the tank, and discharges the fluid introduced from a lower portion into the atmosphere in a gaseous state from an upper portion; Equipped with The bent post is A lower cylinder body extending upward from the hull; A ship having an upper cylindrical body that is movable relative to the lower cylindrical body between a first position extending upward from the lower cylindrical body and a second position whose upper end is located lower than the first position.

2. The hull is A pair of sides and an upper deck; A superstructure having a living area provided on the upper deck, When the upper cylinder body is disposed at the first position, the upper end of the upper cylinder body is positioned higher than the upper end of the superstructure.

2. The watercraft of claim 1.

3. The superstructure comprises: A superstructure body having the accommodation space; and an auxiliary facility provided on the upper structure body, When the upper cylinder body is positioned at the second position, the upper end of the lower cylinder body is positioned at a height equal to or higher than the upper structure body.

3. The watercraft of claim 2.

4. The upper cylinder is When performing normal navigation, the satellite is disposed in the first position; When passing under a structure with a height restriction, the vehicle is disposed at the second position.

3. A vessel as claimed in claim 1 or 2.

5. The upper cylinder is disposed radially outside or inside the lower cylinder and is movable vertically relative to the lower cylinder.

3. A vessel as claimed in claim 1 or 2.

6. The device further includes an annular seal member disposed between the upper cylinder and the lower cylinder.

6. A watercraft as claimed in claim 5.

7. The lower end of the upper cylinder body is rotatably connected to the upper end of the lower cylinder body, and the upper cylinder body is in a state of being laterally tilted relative to the lower cylinder body in the second position.

3. A vessel as claimed in claim 1 or 2.

8. The upper cylinder body may further include a drive mechanism for moving the upper cylinder body between the first position and the second position.

3. A vessel as claimed in claim 1 or 2.

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