Ship

Abstract

This ship comprises: a hull; a vent post extending upward from the hull, introducing gas generated in the hull from a lower part, and discharging the gas from an upper part into the atmosphere; and an auxiliary propulsion part having a cylindrical body which has a cylindrical shape centered on an axis extending upward from the hull to surround the vent post, and can rotate around the axis, and a drive part which rotates the cylindrical body around the axis, the auxiliary propulsion part generating a portion of the propulsion force of the hull.

Description

ship

[0001] This application claims priority to Japanese Patent Application No. 2024-112457, filed on July 12, 2024, the contents of which are incorporated herein by reference.

[0002] A vessel carrying fuel for propulsion or flammable gas as cargo is provided with a vent post for releasing the flammable gas into the atmosphere outside the vessel. For example, Patent Document 1 discloses a configuration including a vent post for releasing ammonia from an ammonia-containing portion provided in the hull into the atmosphere. The vent post extends upward from the upper deck of the hull, for example. When discharging gas that may be harmful to humans, the outlet of such a vent post must be located at a height equal to or higher than that specified by regulations.

[0003] Japanese Patent Application Laid-Open No. 2022-156543

[0004] By the way, ships equipped with rotor sails or rigid sails as auxiliary propulsion units that generate part of the ship's propulsion force are known. These auxiliary propulsion units, such as rotor sails and rigid sails, generate part of the ship's propulsion force by utilizing the wind flowing around the ship. Such auxiliary propulsion units that utilize wind are often installed on the upper deck of the hull.

[0005] However, such an auxiliary propulsion unit must be arranged in a limited space on the deck. In ships such as liquefied gas carriers and liquefied gas fueled ships that are equipped with vent posts and gas piping on the upper deck, such as the ship described in Patent Document 1, it is difficult to determine the space for arranging the auxiliary propulsion unit, and it may be difficult to employ an auxiliary propulsion unit.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a ship in which an auxiliary propulsion unit can be easily adopted.

[0007] In order to solve the above problems, the vessel according to the present disclosure includes a hull, a vent post, and an auxiliary propulsion unit. The vent post extends upward from the hull. Gas generated within the hull is introduced into the vent post from the bottom and discharged into the atmosphere from the top. The auxiliary propulsion unit has a tubular section and a drive unit. The tubular section is cylindrical, centered on an axis extending upward from the hull, and surrounds the vent post. The tubular section is rotatable about the axis. The drive unit rotates the tubular section about the axis. The auxiliary propulsion unit generates part of the propulsive force of the hull.

[0008] According to the vessel of the present disclosure, an auxiliary propulsion unit can be easily adopted.

[0009] Fig. 1 is a side view of a marine vessel according to a first embodiment of the present disclosure; Fig. 2 is a diagram showing a configuration of a vent post and an auxiliary propulsion unit of the marine vessel according to the first embodiment of the present disclosure; Fig. 3 is a side view of a marine vessel according to a second embodiment of the present disclosure; Fig. 4 is a diagram showing a configuration of a vent post and an auxiliary propulsion unit of the marine vessel according to the second embodiment of the present disclosure;

[0010] First Embodiment A ship according to an embodiment of the present disclosure will now be described with reference to Figures 1 to 4. (Configuration of Ship) As shown in Figure 1, a ship 1A according to this embodiment includes a hull 2, a tank 10, and a post section 20A. The type of ship 1A is not limited to a specific type. Examples of the type of ship 1A include a liquefied gas carrier that transports LPG (liquefied petroleum gas), LNG (liquefied natural gas), liquefied ammonia, methanol, liquefied hydrogen, etc., and a liquefied gas-fueled ship that runs on LPG, LNG, liquefied ammonia, methanol, liquefied hydrogen, etc. as fuel.

[0011] (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. In the ship 1A of this embodiment, a cargo space 8 for carrying cargo is provided, for example, closer to the bow 2a side of the superstructure 7 in the fore-aft direction FA.

[0012] The tanks 10 are provided in the hull 2. The tanks 10 are 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 lined up 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 stores liquefied gas. Each tank 10 can store liquefied gas, for example, liquefied ammonia.

[0013] (Configuration of Post Section) Figure 2 is a diagram showing the configuration of a vent post and an auxiliary propulsion section of a ship according to the first embodiment of the present disclosure. The post section 20A includes a vent post 30 and an auxiliary propulsion section 40A. The post sections 20A of the first embodiment are provided on the upper deck 5, and three of them are provided at intervals in the fore-aft direction FA. In other words, the number of post sections 20A of the first embodiment is the same as the number of tanks 10. Note that the number, arrangement, shape, etc. of the post sections 20A are not limited in any way and can be changed as appropriate.

[0014] (Configuration of the vent post) The vent post 30 extends upward from the hull 2. The vent post 30 of the first embodiment extends upward from the upper deck 5 of the hull 2. The vent post 30 is formed in a tubular shape extending in the vertical direction Dv. The vent post 30 has, for example, a cylindrical shape. The vent post 30 is connected to the tank 10 via a connecting pipe 15. The connecting pipe 15 is capable of communicating with the gas phase inside the tank 10. The connecting pipe 15 forms a circulation path for ammonia gas. Ammonia gas discharged from the tank 10 as gas generated inside the hull 2 ​​is introduced into the lower part of the vent post 30 via the connecting pipe 15. The vent post 30 releases the introduced ammonia gas into the atmosphere from the upper part.

[0015] A safety valve (not shown) is provided midway through the connecting pipe 15. The safety valve (not shown) is normally closed and blocks the flow path within the connecting pipe 15. On the other hand, when the pressure in the flow path within the connecting pipe 15 reaches or exceeds a preset specified value, the safety valve (not shown) is opened. When the safety valve (not shown) is opened, the flow path within the connecting pipe 15 is opened. When the flow path within the connecting pipe 15 is opened, ammonia gas passes through the connecting pipe 15 and is introduced into the vent post 30 and released into the atmosphere. Furthermore, the safety valve (not shown) returns to a closed state when the pressure in the flow path within the connecting pipe 15 falls below a preset specified value.

[0016] (Configuration of Auxiliary Propulsion Unit) The auxiliary propulsion unit 40A generates part of the propulsive force of the hull 2. In the first embodiment, a case where the auxiliary propulsion unit 40A is a rotor sail will be described as an example. As shown in Figure 2, the auxiliary propulsion unit 40A includes a cylindrical body 41A and a drive unit 42A.

[0017] The cylindrical body 41A has a cylindrical shape centered on an axis O that extends upward from the hull 2. The cylindrical body 41A of the first embodiment has a cylindrical shape centered on the axis O. The cylindrical body 41A is provided with a gap on the outer side in the radial direction Dr, centered on the axis O, relative to the vent post 30. In other words, the cylindrical body 41A surrounds the entire circumference of the vent post 30 from the outer side in the radial direction Dr.

[0018] The lower end of the cylindrical body 41A is spaced upward from the upper deck 5 (in other words, the hull 2). The upper end of the cylindrical body 41A is located lower than the upper end of the vent post 30. In other words, the vent post 30 protrudes upward from the cylindrical body 41A.

[0019] The cylindrical body 41A is supported on the hull 2 ​​via a cylindrical body support mechanism 43A. The cylindrical body support mechanism 43A supports the load of the cylindrical body 41A from below and supports the cylindrical body 41A so that it can rotate freely around the axis O. The cylindrical body support mechanism 43A is provided outside the cylindrical body 41A in the radial direction Dr, which is centered on the axis O.

[0020] The cylindrical body support mechanism 43A includes a housing 44 and a pad 45. In the first embodiment, the housing 44 and the pad 45 are provided above and spaced apart from the upper deck 5. This allows the housing 44 of the cylindrical body support mechanism 43A to be positioned while minimizing interference with other equipment and piping systems arranged on the upper deck 5.

[0021] The housing 44 integrally includes a bottom wall portion 441, a peripheral wall portion 442, and an upper wall portion 443. The housing 44 is supported, for example, by a support base (not shown) provided on the upper deck 5. The bottom wall portion 441 is plate-shaped and extends along a plane intersecting the axis O. The bottom wall portion 441 has an opening 441h centered on the axis O and is annular when viewed from above. The inner peripheral edge of the opening 441h is spaced outward in the radial direction Dr from the outer peripheral surface of the cylindrical body 41A.

[0022] The peripheral wall portion 442 rises upward from the upper surface of the bottom wall portion 441. When viewed from above, the peripheral wall portion 442 of the first embodiment is formed in a cylindrical shape centered on the axis line O. However, the peripheral wall portion 442 is not limited to a cylindrical shape.

[0023] The upper wall portion 443 extends from the upper end of the peripheral wall portion 442 in a direction approaching the axis O, i.e., inward in the radial direction Dr. The upper wall portion 443 has an opening 443h centered on the axis O. The inner peripheral edge of the opening 443h is spaced outward in the radial direction Dr from the outer circumferential surface of the cylindrical body 41A. When viewed from above, the upper wall portion 443 overlaps at least a portion of the pad 45. In other words, the pad 45 is located vertically below at least a portion of the upper wall portion 443.

[0024] The pad 45 is joined to the outer peripheral surface of the cylindrical body 41A by welding or the like. The pad 45 has an annular shape when viewed from above. The pad 45 is formed in a plate shape extending in a direction perpendicular to the axis O.

[0025] The pad 45 is supported on the bottom wall portion 441 via a thrust bearing 46 so as to be rotatable about the axis O. The pad 45 is further supported on the radial inner side of the peripheral wall portion 442 in the radial direction Dr so as to be rotatable about the axis O via a radial bearing 47. An upper wall portion 443 is located above the pad 45, and this upper wall portion 443 restricts the upward movement of the pad 45.

[0026] The driving unit 42A is provided on the outer side of the cylindrical body 41A in the radial direction Dr. The driving unit 42A is provided below and spaced apart from the cylindrical body support mechanism 43A. The driving unit 42A includes a driven gear 48 and a driving motor 49.

[0027] The driven gear 48 is joined to the outer peripheral surface of the cylindrical body 41A by welding or the like. When viewed from above, the driven gear 48 has an annular shape centered on the axis O. The driven gear 48 is formed in a plate shape extending from the outer peripheral surface of the cylindrical body 41A perpendicular to the axis O. The outer periphery of the driven gear 48 has a plurality of gear teeth (not shown) arranged in a circumferential direction centered on the axis O.

[0028] The drive motor 49 is disposed radially outward of the driven gear 48 in the Dr direction. The drive motor 49 is provided on the upper deck 5 via a support member (not shown). The drive motor 49 includes a motor body 491 and a drive gear 492.

[0029] The motor body 491 has a drive shaft 491s extending in the vertical direction Dv. The motor body 491 converts electrical energy into rotational energy and drives the drive shaft 491s to rotate about its central axis C. A drive gear 492 is provided on the drive shaft 491s. The drive gear 492 has a plurality of gear teeth (not shown) on its outer periphery that mesh with the gear teeth of the driven gear 48. The drive motor 49 drives the drive gear 492 together with the drive shaft 491s to rotate about the central axis C, thereby rotating the driven gear 48 and the cylindrical body 41A about the axis O.

[0030] In the first embodiment, the drive motor 49 can switch the rotation direction of the driven gear 48 and the cylindrical body 41A between a first direction Dc1 about the axis O (for example, rotation in this direction is referred to as forward rotation) and a second direction Dc2 opposite to the first direction Dc (for example, rotation in this direction is referred to as reverse rotation). In other words, the drive motor 49 can rotate the cylindrical body 41A forward and reverse about the axis O.

[0031] In the first embodiment, the auxiliary propulsion unit 40A, which is a rotor sail, rotates the cylindrical body 41A around the axis O using the drive unit 42A when wind is blowing from a direction intersecting the fore-aft direction FA. Then, due to the Magnus effect, a pressure difference occurs between the bow 2a side and the stern 2b side of the cylindrical body 41A in the fore-aft direction FA. When the drive unit 42A rotates the cylindrical body 41A so that the pressure on the stern 2b side in the fore-aft direction FA of the cylindrical body 41A is higher than the pressure on the bow 2a side in the fore-aft direction FA of the cylindrical body 41A, a force acts on the cylindrical body 41A pushing the cylindrical body 41A toward the bow 2a in the fore-aft direction FA. In this way, the auxiliary propulsion unit 40A generates part of the propulsive force of the hull 2.

[0032] (Operation and Effect) In the vessel 1A of the first embodiment, the auxiliary propulsion unit 40A that generates part of the propulsive force of the hull 2 ​​is provided so as to surround the vent post 30. This makes it easy to arrange the auxiliary propulsion unit 40A in the limited space on the upper deck 5 in the vessel 1A that is equipped with the vent post 30. Therefore, the auxiliary propulsion unit 40A can be easily adopted.

[0033] In the first embodiment, the auxiliary propulsion unit 40A is a rotor sail. As a result, when wind is blowing from a direction intersecting the fore-and-aft direction FA of the vessel 1A, the cylindrical body 41A can be rotated about the axis O by the drive unit 42A to generate part of the thrust of the hull 2 ​​by the Magnus effect. Therefore, the inside of the cylindrical body 41A can be effectively used as a space for arranging the vent post 30 without impeding the generation of thrust by the rotor sail.

[0034] Furthermore, in the first embodiment described above, the cylinder support mechanism 43A, which supports the load of the cylinder 41A from below, is provided on the radial outside Dr of the cylinder 41A, so that the cylinder support mechanism 43A can be positioned while suppressing interference between the cylinder support mechanism 43A and the vent post 30.

[0035] Similarly, in the first embodiment, the drive unit 42A is provided on the radially outer side of the cylindrical body 41A in the radial direction Dr. Therefore, the drive unit 42A can be disposed while suppressing interference between the drive unit 42A and the vent post 30.

[0036] Furthermore, in the first embodiment, the vent post 30 protrudes upward from the cylindrical body 41A, which prevents the gas discharged into the atmosphere from coming into contact with the auxiliary propulsion part 40A. This allows the gas to be smoothly discharged into the atmosphere from the vent post 30.

[0037] Second Embodiment Next, a second embodiment of a ship according to the present disclosure will be described. In the second embodiment described below, only the configuration of the auxiliary propulsion unit differs from the first embodiment, and therefore the same parts as in the first embodiment will be denoted by the same reference numerals and will not be described again. (Configuration of Ship) Figure 3 is a side view of a ship according to a second embodiment of the present disclosure. As shown in Figure 3, a ship 1B of this second embodiment includes a hull 2, a tank 10, and a post unit 20B.

[0038] (Configuration of Post Section) Figure 4 is a diagram showing the configuration of a vent post and an auxiliary propulsion section of a ship according to a second embodiment of the present disclosure. The post section 20B is provided on the upper deck 5. In the second embodiment, three post sections 20B are provided at intervals in the bow-stern direction FA. The number of post sections 20B provided is the same as the number of tanks 10. Note that the number, arrangement, shape, etc. of the post sections 20B are not limited in any way and can be changed as appropriate. As shown in Figures 3 and 4, each post section 20B includes a vent post 30 and an auxiliary propulsion section 40B.

[0039] (Configuration of the vent post) The vent post 30 extends upward from the hull 2. The vent post 30 of the second embodiment extends upward from the upper deck 5 of the hull 2. The vent post 30 is formed in a tubular shape extending in the vertical direction Dv. The vent post 30 has, for example, a cylindrical shape. The vent post 30 is connected to the tank 10 via a connecting pipe 15. The connecting pipe 15 is capable of communicating with the gas phase inside the tank 10. The connecting pipe 15 forms a circulation path for ammonia gas. Ammonia gas discharged from the tank 10 as gas generated inside the hull 2 ​​is introduced into the lower part of the vent post 30 via the connecting pipe 15. The vent post 30 releases the introduced ammonia gas into the atmosphere from the upper part.

[0040] A safety valve (not shown) is provided midway through the connecting pipe 15. The safety valve (not shown) is normally closed and blocks the flow path within the connecting pipe 15. On the other hand, when the pressure in the flow path within the connecting pipe 15 reaches or exceeds a preset specified value, the safety valve (not shown) opens. When the safety valve (not shown) opens, the flow path within the connecting pipe 15 is opened. When the flow path within the connecting pipe 15 is opened, ammonia gas passes through the connecting pipe 15 and is introduced into the vent post 30 and released into the atmosphere. Furthermore, the safety valve (not shown) returns to a closed state when the pressure in the flow path within the connecting pipe 15 falls below a preset specified value.

[0041] (Configuration of Auxiliary Propulsion Unit) The auxiliary propulsion unit 40B generates part of the propulsive force of the hull 2. In the second embodiment, a case will be described where the auxiliary propulsion unit 40B is a rigid sail. As shown in FIG. 4 , the auxiliary propulsion unit 40B includes a cylindrical body 41B, a drive unit 42B, and a sail 50.

[0042] The cylindrical body 41B has a cylindrical shape centered on an axis O extending upward from the hull 2. The cylindrical body 41B of the second embodiment may be cylindrical and centered on the axis O, or may be, for example, a polygonal cylindrical shape. The cylindrical body 41B is provided with a gap on the outer side in the radial direction Dr centered on the axis O relative to the vent post 30. In other words, the cylindrical body 41B surrounds the entire circumference of the vent post 30 from the outer side in the radial direction Dr.

[0043] The lower end of the cylindrical body 41B is spaced upward from the upper deck 5 (in other words, the hull 2). The upper end of the cylindrical body 41B is located lower than the upper end of the vent post 30. In other words, the vent post 30 protrudes upward from the cylindrical body 41B.

[0044] The cylindrical body 41B is supported on the hull 2 ​​via a cylindrical body support mechanism 43B. The cylindrical body support mechanism 43B supports the load of the cylindrical body 41B from below and supports the cylindrical body 41B so that it can rotate freely around the axis O. The cylindrical body support mechanism 43B is provided outside the cylindrical body 41B in the radial direction Dr, which is centered on the axis O.

[0045] The cylindrical body support mechanism 43B includes a housing 44 and a pad 45. In the second embodiment, the housing 44 and the pad 45 are provided above and spaced apart from the upper deck 5. This allows the housing 44 of the cylindrical body support mechanism 43B to be positioned while minimizing interference with other equipment and piping systems arranged on the upper deck 5.

[0046] The housing 44 integrally includes a bottom wall portion 441, a peripheral wall portion 442, and an upper wall portion 443. The housing 44 is supported, for example, by a support base (not shown) provided on the upper deck 5. The bottom wall portion 441 is plate-shaped and extends along a plane intersecting the axis O. The bottom wall portion 441 has an opening 441h centered on the axis O and has an annular shape when viewed from above. The inner peripheral edge of the opening 441h is spaced outward in the radial direction Dr from the outer peripheral surface of the cylindrical body 41B.

[0047] The peripheral wall portion 442 rises upward from the upper surface of the bottom wall portion 441. When viewed from above, the peripheral wall portion 442 of the second embodiment is formed in a cylindrical shape centered on the axis line O. However, the peripheral wall portion 442 is not limited to a cylindrical shape.

[0048] The upper wall portion 443 extends from the upper end of the peripheral wall portion 442 in a direction approaching the axis O, i.e., inward in the radial direction Dr. The upper wall portion 443 has an opening 443h centered on the axis O. The inner peripheral edge of the opening 443h is spaced outward in the radial direction Dr from the outer circumferential surface of the cylindrical body 41B. When viewed from above, the upper wall portion 443 overlaps at least a portion of the pad 45. In other words, the pad 45 is located vertically below at least a portion of the upper wall portion 443.

[0049] The pad 45 is joined to the outer peripheral surface of the cylindrical body 41B by welding or the like. The pad 45 has an annular shape when viewed from above. The pad 45 is formed in a plate shape extending in a direction perpendicular to the axis O.

[0050] The pad 45 is supported on the bottom wall portion 441 via a thrust bearing 46 so as to be rotatable about the axis O. The pad 45 is further supported inside the peripheral wall portion 442 via a radial bearing 47 so as to be rotatable about the axis O. An upper wall portion 443 is located above the pad 45, and this upper wall portion 443 restricts the upward movement of the pad 45.

[0051] The driving unit 42B is provided on the outer side of the cylindrical body 41B in the radial direction Dr. The driving unit 42B is provided below and spaced apart from the cylindrical body support mechanism 43B. The driving unit 42B includes a driven gear 48 and a driving motor 49.

[0052] The driven gear 48 is joined to the outer peripheral surface of the cylindrical body 41B by welding or the like. When viewed from above, the driven gear 48 has an annular shape centered on the axis O. The driven gear 48 is formed in the shape of a plate extending from the outer peripheral surface of the cylindrical body 41B perpendicular to the axis O. The outer periphery of the driven gear 48 has a plurality of gear teeth (not shown) arranged in a circumferential direction centered on the axis O.

[0053] The drive motor 49 is disposed radially outward of the driven gear 48 in the Dr direction. The drive motor 49 is provided on the upper deck 5 via a support member (not shown). The drive motor 49 includes a motor body 491 and a drive gear 492.

[0054] The motor body 491 has a drive shaft 491s extending in the vertical direction Dv. The motor body 491 converts electrical energy into rotational energy and drives the drive shaft 491s to rotate about its central axis C. A drive gear 492 is provided on the drive shaft 491s. The drive gear 492 has a plurality of gear teeth (not shown) on its outer periphery that mesh with the gear teeth of the driven gear 48. The drive motor 49 drives the drive gear 492 together with the drive shaft 491s to rotate about the central axis C, thereby rotating the driven gear 48 and the cylindrical body 41B about the axis O.

[0055] The sails 50 are provided on the cylindrical body 41B and extend outward from the cylindrical body 41B in the radial direction Dr of the cylindrical body 41B. The sails 50 are formed, for example, in the shape of a plate extending along a plane including the axis O. The sails 50 are formed, for example, from a hard material such as metal. The sails 50 are provided symmetrically on one side and the other side of the cylindrical body 41B in the radial direction Dr. The specific shape, number, etc. of the sails 50 are not limited in any way and can be changed as appropriate.

[0056] The rigid sail, which is the auxiliary propulsion unit 40B, adjusts the direction of the sail 50 in accordance with the wind direction around the vessel 1B by rotating the cylindrical body 41B around the axis O with the drive unit 42B. When the wind hits the sail 50 with the sail 50 facing in the appropriate direction, a force acts on the sail 50 to push the hull 2 ​​toward the bow 2a in the fore-aft direction FA. In this way, the auxiliary propulsion unit 40B generates part of the propulsive force of the hull 2.

[0057] (Operation and Effect) In the vessel 1B of the second embodiment, the auxiliary propulsion unit 40B that generates part of the propulsive force of the hull 2 ​​is provided so as to surround the vent post 30. This makes it easy to arrange the auxiliary propulsion unit 40B in the limited space on the upper deck 5 in the vessel 1B that is equipped with the vent post 30. Therefore, the auxiliary propulsion unit 40B can be easily adopted.

[0058] Furthermore, in the second embodiment, the auxiliary propulsion unit 40B is a hard sail. With this auxiliary propulsion unit 40B, the sail 50, which extends outward from the cylindrical body 41B in the radial direction Dr of the cylindrical body 41B, can be rotated around the axis O in accordance with the wind direction, so that the sail 50 catches the wind and generates part of the propulsive force of the hull 2. Therefore, the inside of the cylindrical body 41B can be effectively used as a space for arranging the vent post 30 without impeding the generation of propulsive force by the hard sail.

[0059] Furthermore, in the second embodiment, the cylinder support mechanism 43B, which supports the load of the cylinder 41B from below, is provided on the radial outside Dr of the cylinder 41B, so that the cylinder support mechanism 43B can be positioned while suppressing interference between the cylinder support mechanism 43B and the vent post 30.

[0060] Similarly, in the second embodiment, the drive unit 42B is provided on the outer side of the cylindrical body 41B in the radial direction Dr, so that the drive unit 42B can be positioned while suppressing interference between the drive unit 42B and the vent post 30.

[0061] Furthermore, in the second embodiment, the vent post 30 protrudes upward from the cylindrical body 41B, which prevents the gas discharged into the atmosphere from coming into contact with the auxiliary propulsion section 40B. This allows the gas to be smoothly discharged into the atmosphere from the vent post 30.

[0062] While the embodiments of the present disclosure have been described above in detail with reference to the drawings, the specific configurations are not limited to these embodiments and include design modifications within the scope of the present disclosure. In the above embodiments, examples of the configurations of the cylinder support mechanisms 43A and 43B and the drive units 42A and 42B have been described, but the specific configurations of the cylinder support mechanisms and the drive units can be modified as appropriate.

[0063] Furthermore, in each of the above embodiments, the tank 10 stores liquefied ammonia as cargo (cargo), but this is not limiting. 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 as a main engine for propelling the hull, an internal combustion engine used in a power generation facility that supplies electricity to the ship, and a boiler that generates steam as a working fluid.

[0064] Furthermore, in each of the above embodiments, the tank 10 is provided in the cargo space 8 inside the hull 2, but this is not limitative. The tank 10 may be provided on the upper deck 5, for example.

[0065] In addition, in each of the above embodiments, liquefied ammonia is exemplified as the liquefied gas stored in the tank 10, but this is not limiting. The liquefied gas may be, for example, liquefied natural gas, liquefied petroleum gas, liquefied hydrogen, methanol, etc.

[0066] <Additional Notes> The boats 1A and 1B described in the respective embodiments can be understood, for example, as follows.

[0067] (1) The vessels 1A, 1B according to the first aspect comprise a hull 2, a vent post 30 extending upward from the hull 2, through which gas generated within the hull 2 ​​is introduced from the bottom and discharged into the atmosphere from the top, and auxiliary propulsion units 40A, 40B which generate part of the propulsive force of the hull 2, each having a cylindrical body 41A, 41B centered on an axis O extending upward from the hull 2 ​​and surrounding the vent post 30, and which are rotatable around the axis O, and each having a drive unit 42A, 42B which rotates the cylindrical body 41A, 41B around the axis O.

[0068] This makes it easier to arrange the auxiliary propulsion units 40A, 40B in the limited space on the deck 5 of the vessels 1A, 1B equipped with the vent post 30. Therefore, the auxiliary propulsion units 40A, 40B can be easily adopted.

[0069] (2) The vessel 1A according to the second aspect is the vessel 1A of (1), in which the auxiliary propulsion unit 40A is a rotor sail, the cylindrical body 41A is cylindrical with the axis O as its center, and the drive unit 42A is capable of rotating the cylindrical body 41A forward and backward around the axis O.

[0070] This allows the inside of the cylindrical body 41A to be effectively used as a space for arranging the vent post 30 without interfering with the generation of thrust by the rotor sail.

[0071] (3) The vessel 1B according to the third aspect is the vessel 1B of (1), wherein the auxiliary propulsion unit 40B is a rigid sail provided on the cylindrical body 41B and having a sail 50 extending from the cylindrical body 41B outward in the radial direction Dr of the cylindrical body 41B.

[0072] This allows the inside of the cylindrical body 41B to be effectively used as a space for arranging the vent post 30 without interfering with the generation of propulsive force by the rigid sail.

[0073] (4) The vessels 1A, 1B according to a fourth aspect are any one of the vessels 1A, 1B of (1) to (3), and further include a cylindrical body support mechanism 43A, 43B that is provided radially outside the cylindrical bodies 41A, 41B centered on the axis O in the radial direction Dr, supports the load of the cylindrical bodies 41A, 41B from below, and supports the cylindrical bodies 41A, 41B so as to be rotatable around the axis O.

[0074] This allows the cylindrical body support mechanisms 43A, 43B to be arranged while suppressing interference between the cylindrical body support mechanisms 43A, 43B and the vent post 30.

[0075] (5) The ships 1A, 1B according to a fifth aspect are the ships 1A, 1B of (4), in which the drive units 42A, 42B are provided on the outer side of the cylindrical bodies 41A, 41B in the radial direction Dr.

[0076] This allows the drive units 42A, 42B to be positioned while minimizing interference between the drive units 42A, 42B and the vent post 30.

[0077] (6) The vessels 1A, 1B according to a sixth aspect are any one of the vessels 1A, 1B according to (1) to (5), in which the vent post 30 protrudes upward from the cylindrical bodies 41A, 41B.

[0078] This allows gas to be smoothly released into the atmosphere from the vent post 30 .

[0079] According to the vessel of the present disclosure, an auxiliary propulsion unit can be easily adopted.

[0080] DESCRIPTION OF REFERENCE NUMERALS 1A, 1B Ship 2 Hull 2a Bow 2b Stern 3A, 3B Side 4 Ship bottom 5 Upper deck (deck) 7 Superstructure 8 Cargo space 10 Tank 15 Connecting pipe 20A, 20B Post section 30 Vent post 40A, 40B Auxiliary propulsion section 41A, 41B Cylindrical body 42A, 42B Drive section 43A, 43B Cylindrical body support mechanism 44 Housing 441 Bottom wall section 441h Opening 442 Peripheral wall section 443 Upper wall section 443h Opening 45 Pad 46 Thrust bearing 47 Radial bearing 48 Driven gear 49 Drive motor 491 Motor body 491s Drive shaft 492 Drive gear 50 Sail

Claims

1. A vessel comprising: a hull; a vent post extending upward from the hull, through which gas generated within the hull is introduced from the bottom and discharged into the atmosphere from the top; and an auxiliary propulsion unit that generates part of the propulsive force of the hull, the auxiliary propulsion unit having a cylindrical body centered on an axis extending upward from the hull and surrounding the vent post, and that is rotatable about the axis, and a drive unit that rotates the cylindrical body about the axis.

2. The vessel according to claim 1, wherein the auxiliary propulsion unit is a rotor sail, the cylindrical body has a cylindrical shape centered on the axis, and the drive unit is capable of rotating the cylindrical body forward and backward around the axis.

3. The vessel according to claim 1, wherein the auxiliary propulsion unit is a rigid sail provided on the cylindrical body and having a sail extending radially outward from the cylindrical body.

4. A vessel as described in claim 1 or 2, further comprising a cylindrical body support mechanism that is provided radially outside the cylindrical body centered on the axis, supports the load of the cylindrical body from below, and supports the cylindrical body so that it can rotate freely around the axis.

5. The vessel according to claim 4, wherein the drive unit is provided radially outside the cylindrical body.

6. A vessel according to claim 1 or 2, wherein the vent post protrudes above the cylindrical body.

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