JP2022138421A - Ship - Google Patents

Abstract

To provide a ship capable of effectively making use of a storage battery while suppressing an increase in size of the ship.SOLUTION: A ship 1 comprises a storage battery 30 for storing electric power. The storage battery 30 is arranged in a rudder gear room 7. A space in the ship can be saved by suppressing installation of a newly added dedicated battery room for placing the storage battery 30 and by placing the storage battery 30 in the rudder gear room 7 which is an existing space in the ship 1. An existing ventilation mechanism (a ventilation part 33) is provided in the rudder gear room 7 since an installation place of the storage battery 30 must be ventilated. Therefore, an increase in size of the ship 1 due to increased facilities can be suppressed by placing the storage battery 30 in the rudder gear room 7 and by diverting the existing ventilation mechanism.SELECTED DRAWING: Figure 2

Description

The present invention relates to ships.

As a conventional ship, the one described in Patent Document 1 is known. This ship includes a cargo handling section for storing cargo, an engine room for arranging the main engine, a pump room for arranging pumps, and the like. In a ship, various devices operate at necessary timings for propulsion of the hull, driving of pumps for cargo handling, and the like.

JP 2008-132974 A

Here, a storage battery may be mounted on the ship as described above. In this case, the storage battery can store electric power generated by the energy of a predetermined operation (rotation of the propeller by the main engine, etc.) in the ship, and supply electric power for the operation of various devices. However, it can be difficult to place in the limited space of the ship. On the other hand, if an independent battery room or the like is provided for arranging the storage battery, a problem arises in that the size of the ship increases.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a ship capable of effectively using a storage battery while suppressing an increase in size.

A ship according to the present invention includes a ventilation room in which a ventilation mechanism is provided, and a storage battery for storing electric power, and the storage battery is arranged in the ventilation room.

Ships are equipped with storage batteries that store electric power. The storage battery can store electric power generated by predetermined power (power of the main engine that rotates the propeller) in the ship. In addition, the storage battery can supply the stored electric power at appropriate timing for the operation of various devices. Here, the storage battery is arranged in a ventilation chamber in which a ventilation mechanism is provided. In this way, by suppressing the need to newly add a dedicated battery room for arranging the storage battery, and by arranging the storage battery in the existing space of the ventilation room on the ship, it is possible to save space on board. can be done. In addition, the existing ventilation mechanism (ventilation by a fan) is installed in the ventilation room, as opposed to the place where the storage battery is placed needs to be ventilated. Therefore, by arranging the storage battery in the steering gear room and using the existing ventilation mechanism, it is possible to suppress the enlargement of the ship due to the increase in facilities and the increase in the number of devices. As described above, the storage battery can be effectively used while suppressing an increase in size. In addition, the engine room can be mentioned as another room where a ventilation mechanism with a fan is installed. Therefore, the storage battery may be provided in the engine room.

The ventilation room is a steering gear room in which a steering gear for operating the rudder is arranged, and the storage battery may be arranged in the steering gear room. In this case, the location of the storage battery can be ventilated using a ventilation mechanism (ventilation by a fan) provided as existing equipment in the steering gear room.

The storage battery may be arranged on the bow side of the steering gear. The steering gear is arranged directly above the rudder provided on the stern side. Therefore, in the steering gear room, there is more space on the bow side than on the stern side with respect to the steering gear. By arranging the storage battery in a place with sufficient space in this way, the degree of freedom in arrangement can be improved.

The steering gear room is configured on multiple floors, and the storage battery may be arranged on at least one of the floors. In this case, the storage battery can be arranged by effectively utilizing the space in the height direction of the steering gear room.

The storage battery may be capable of storing electric power generated by the rotation of the rotating shaft of the propeller of the propulsion shaft system. The propeller shaft is powered by the highly efficient main engine. Therefore, part of the power of the highly efficient main engine can be recovered as electric power, and the electric power can be stored in the storage battery.

The battery may be capable of supplying power to a device that rotates the shaft of the propeller of the propulsion shaft system. For example, when propelling a ship at a low speed in a harbor, the main engine can be stopped and the propeller can be rotated by the electric power of the storage battery. Since the main engine can be kept stopped in this way, it is possible to suppress the generation of smoke in harbors and the like, and to reduce air pollution in harbors.

The storage battery may be capable of supplying power to equipment that operates during cargo handling. For example, if the equipment that operates during cargo handling is driven by a turbine driven by steam from a boiler or a motor driven by electric power from a generator, the size of the boiler or generator that serves as the drive source should be increased even though the equipment is only used during cargo handling. need to be done. On the other hand, by using the electric power stored in the storage battery for equipment that operates during cargo handling, it is possible to suppress the increase in size of the drive source as described above and reduce air pollution in ports.

A vessel may be a tanker. As a result, it is possible to suppress the increase in size of the tanker and effectively utilize the storage battery in the tanker.

ADVANTAGE OF THE INVENTION According to this invention, the ship which can utilize a storage battery effectively can be provided, suppressing enlargement.

It is a side view showing a ship concerning an embodiment of the present invention. Figure 2 is an enlarged view of the stern portion of the vessel of Figure 1; It is the schematic which shows an example of arrangement|positioning of the storage battery in a steering gear room. It is the schematic which shows an example of arrangement|positioning of the storage battery in a steering gear room. It is a schematic diagram which shows the connection structure between each electrical equipment in a ship. It is a schematic diagram which shows the flow of the electricity in each electricity supply mode. It is a schematic diagram which shows the flow of the electricity in each electricity supply mode. It is a schematic diagram which shows the flow of the electricity in each electricity supply mode. It is a schematic diagram which shows the flow of the electricity in each electricity supply mode.

Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, the same or corresponding parts are denoted by the same reference numerals, and overlapping descriptions are omitted.

FIG. 1 is a side view showing a ship according to an embodiment of the invention. 2 is an enlarged view showing the stern portion of the vessel of FIG. 1; FIG. As shown in FIG. 1 , a ship 1 of this embodiment is a tanker or the like having a container for containing cargo, and includes a hull 2 , a propulsion shaft system 3 and a rudder 4 . In the following description, the bow side direction may be referred to as "forward" and the stern side direction may be referred to as "rear".

The hull 2 has an engine room 6 on the stern side. The engine room 6 is a space for arranging equipment such as the main engine. The main engine drives the propeller of the propulsion shaft system 3 . A pump room 5 is provided on the bow side of the engine room 6 . The hull 2 has a steering gear room 7 , a space under the steering gear room 8 , and a stern structure 9 in this order from above on the stern side of the engine room 6 . The steering gear room 7 is a space for arranging a steering gear for steering the rudder 4 and the like. The steering gear room lower space 8 is a space provided below the steering gear room 7 . The stern structure 9 is provided below the steering room lower space 8 and constitutes a part of the propulsion shaft system 3 . A cargo oil tank, a ballast tank, and the like are provided on the bow side of the pump room 5 .

Next, with reference to FIG. 2, the structure of the stern side will be described in more detail. As shown in FIG. 2 , the steering gear room lower space 8 is provided so as to slope downward from the rear end portion of the hull 2 on the stern side toward the bow side. Therefore, the rear end of the stern structure 9 is arranged closer to the bow than the rear end of the hull 2 . The rear end portion of the stern structure 9 has a shape that protrudes toward the stern side, and the propeller 11 of the propulsion shaft system 3 is provided at the tip portion of the protruding shape.

The propulsion shaft system 3 is a mechanism that generates a propulsion force for the ship 1 . A propulsion shafting 3 is provided for the stern structure 9 . The propulsion shaft system 3 is arranged below the steering gear room space 8, and is arranged at a position lower than at least the water surface when the ship 1 is in operation. The propulsion shaft system 3 includes a propeller 11 and a rotating shaft 12 . The propeller 11 rotates with the rotation of the rotating shaft 12 to generate a water flow toward the rear side. The rotating shaft 12 extends horizontally in the stern structure 9 from the propeller 11 toward the bow side. A main engine 21 in the engine room 6 applies rotational force to the bow-side end of the rotating shaft 12 .

The rudder 4 is a mechanism for turning the ship 1 . The rudder 4 includes a rudder plate 13 and a rotating shaft 14 . The steering plate 13 is arranged on the stern side of the steering gear room space 8 and the stern structure 9, and is arranged at a position lower than at least the water surface when the ship 1 is in operation. Further, the steering plate 13 is arranged at a position facing the propeller 11 on the stern side.

The rudder plate 13 extends in the vertical direction while being spread in the front-rear direction. The rudder blade 13 is connected to the rotating shaft 14 at its upper end. The rotating shaft 14 extends upward from the upper end of the rudder plate 13 . The rotating shaft 14 extends to the inside of the hull 2 through the steering gear room lower space 8 . The rotary shaft 14 extends to the steering gear room 7 and is connected to a steering gear 16 provided in the steering gear room 7 . By rotating the rotating shaft 14, the steering gear 16 can rotate the rudder plate 13 around the rotating shaft 14 to change the orientation.

In addition to the main engine 21 , the engine room 6 is provided with a main switchboard 22 , a diesel generator 23 , a shaft generator 24 , and a cargo oil pump motor 26 . The main switchboard 22 is a device for distributing power to each electrical device of the ship 1 . The main distribution board 22 is fed with power generated on board and distributes the power to appropriate equipment on board. In this embodiment, it is possible to automatically or manually switch whether power is supplied from the diesel generator 23, the shaft generator 24, or the storage battery 30. FIG. The diesel generator 23 is a device for generating electric power using fuel. The diesel generator 23 supplies the generated power to the main switchboard 22 .

The shaft generator 24 is a device that converts the rotational force of the rotating shaft 12 of the propeller 11 into electric power. The shaft generator 24 is provided on the rotating shaft 12 between the propeller 11 and the main engine 21 . The shaft generator 24 generates electricity by converting part of the rotational force into electric power while the main engine 21 is rotating the rotating shaft 12 . The shaft generator 24 supplies the generated power to the main switchboard 22 . The shaft generator 24 is also powered by the main switchboard 22 . The shaft generator 24 can also function as a motor that rotates the rotating shaft 12 by being supplied with electric power. The cargo oil pump motor 26 is a device that generates driving force for driving the pump 27 in the pump chamber 5 .

Here, the ship 1 includes a storage battery 30 that stores electric power generated on board. The storage battery 30 is supplied with electric power generated by the shaft generator 24 and the diesel generator 23 via the main switchboard 22 and stores the electric power. In addition, the storage battery 30 discharges at the timing when electric power is required in the ship, thereby supplying necessary equipment in the ship with electric power via the main switchboard 22 . Between the storage battery 30 and the main distribution board 22, a charging/discharging board 31 for managing charging/discharging of the storage battery 30 is provided.

In this embodiment, the storage battery 30 is arranged in the steering gear room 7 . A charge/discharge board 31 is also arranged in the steering gear room 7 . The steering gear room 7 is provided with a ventilation part 33 to the outside. The ventilation part 33 is configured by a ventilator provided on the ceiling of the steering gear room 7, that is, on the deck. The ventilation part 33 has a mechanism for exhausting air from the inside of the steering gear room 7, such as a fan. The steering gear room 7 is also provided with an intake opening. As a result, the outside air vent 33 can ventilate the inside of the steering gear room 7 . The ventilation part 33 can function as equipment for ventilating the installation space of the steering gear 16 and can also function as equipment for ventilating the installation space of the storage battery 30 .

Next, a specific example of arrangement of the storage battery 30 in the steering gear room 7 will be described with reference to FIG. 3 . FIG. 3(a) is a schematic view showing the inside of the steering gear room 7 when viewed from above. FIG. 3(b) is a schematic diagram showing the state inside the steering gear room 7 when viewed from the starboard side. As shown in FIG. 3A, the steering gear room 7 includes a bow-side front wall portion 7a, an aft-side rear wall portion 7b, a starboard-side side wall portion 7c, a port-side side wall portion 7d, It includes a floor portion 7e and a ceiling portion 7f (see FIG. 3(b)). The front wall portion 7 a also functions as a partition wall portion with the engine room 6 . The floor portion 7e also functions as a partition wall portion with the space 8 below the steering gear room. The ceiling portion 7f also functions as a deck. The steering gear room 7 has a configuration in which the lateral width increases toward the bow side. Therefore, the width of the front wall portion 7a is larger than that of the rear wall portion 7b. The left and right side walls 7c and 7d have a shape that widens in the width direction from the rear wall 7b toward the front wall 7a.

The steering gear 16 is a device arranged directly above the rudder 4 . Therefore, the steering gear 16 is arranged on the stern side of the steering gear room 7 . In this way, since the steering gear 16, which occupies a large space, is arranged at a position closer to the stern side, the bow side of the steering gear room 7 has a margin of space in the longitudinal direction. Furthermore, since the steering gear room 7 has a wider lateral width on the bow side, there is more space. Therefore, the storage battery 30 and the charging/discharging board 31 are arranged on the bow side of the steering gear 16 . Here, the storage battery 30 and the charging/discharging board 31 are arranged in the space between the front wall portion 7a and the steering gear 16 in the front-rear direction. Moreover, the storage battery 30 has an elongated shape in the left-right direction and is arranged in the space. The charging/discharging board 31 is arranged at a position adjacent to the storage battery 30 in the left-right direction. The electric wire of the electricity line L1 connected to the storage battery 30 and the charging/discharging board 31 is routed to the main switchboard 22 of the engine room 6 via the front wall portion 7a. Since the storage battery 30 and the charging/discharging board 31 are arranged on the bow side, the length of the electric wire of the electricity supply line L1 in the steering gear room 7 can be shortened.

As shown in FIG. 3(b), the steering gear 16, the storage battery 30, and the charge/discharge board 31 are installed on the floor 7e. The space in which the steering gear 16, the storage battery 30, and the charging/discharging board 31 are arranged continues up to the ceiling portion 7f. Therefore, the air around the steering gear 16 , the storage battery 30 , and the charging/discharging board 31 is ventilated through the ventilation section 33 .

Also, an arrangement as shown in FIG. 4 may be employed. In the example shown in FIG. 4, the steering gear room 7 is constructed on a plurality of floors (here, the second floor). Such a configuration can be adopted when the ceiling portion 7f of the steering gear room 7 is high. FIG. 4(a) is a schematic view showing the state of the first floor portion of the steering gear room 7 when viewed from above. FIG. 4(b) is a schematic view showing the state of the second floor of the steering gear room 7 when viewed from above. FIG. 4(c) is a schematic diagram showing the state inside the steering gear room 7 when viewed from the starboard side. As shown in FIG. 4(c), the steering gear room 7 is configured as a two-story space by partitioning the space between the floor 7e and the ceiling 7f with the second floor 7g. The second floor section 7g constitutes the floor section of the second floor section and the ceiling section of the first floor section.

As shown in FIG. 4( a ), the steering gear 16 , the charge/discharge board 31 , and the storage battery 30 are arranged in the first floor portion of the steering gear room 7 . The positions and shapes of the steering gear 16 and the charging/discharging board 31 are the same as those shown in FIG. On the other hand, the storage battery 30 is arranged divided into a plurality of units. In the first floor portion, a pair of storage battery 30 units are arranged at positions on the bow side of the steering gear room 7 and near the left and right side walls 7c and 7d. As shown in FIG. 4(b), on the second floor, a plurality of storage batteries 30 are arranged side by side over the entire area. In the second floor, the units of the storage battery 30 are arranged in a row on the stern side and a row on the bow side. Note that the row on the bow side has more units of the storage battery 30 than the row on the stern side. Note that the arrangement of the storage batteries 30 on each floor is not limited to that shown in FIG. Moreover, the unit of the storage battery 30 may be arranged on at least one of the floors, and for example, the unit of the storage battery 30 may be arranged only on the second floor.

A duct 36 extending to the space of the steering gear room 7 is provided from the ventilation part 33 . The duct 36 has an opening 36a that extends downward as it is and opens in the space of the first floor, and an opening 36b that branches and opens in the space of the second floor. As a result, the space on the first floor is ventilated through the opening 36a, and the space on the second floor is ventilated through the opening 36b.

Next, an example of the mode of electricity distribution by the main switchboard 22 for using the storage battery 30 will be described with reference to FIGS. 5 to 9. FIG. FIG. 5 is a schematic diagram showing a connection structure between electrical devices in the ship 1. As shown in FIG. 6 to 9 are schematic diagrams showing the flow of electricity in each energization mode. As shown in FIG. 5, the storage battery 30, the charging/discharging board 31, and the main distribution board 22 are connected via a power supply line L1. The diesel generator 23 and the main switchboard 22 are connected via an electricity line L2. The shaft generator 24 and the main switchboard 22 are connected via a power supply line L3. The cargo oil pump motor 26 and the main switchboard 22 are connected via a power supply line L4. The other equipment 29 of the ship 1 and the main switchboard 22 are connected via the power line L5. In FIGS. 6 to 9, of the energizing lines, the energizing lines through which electricity is flowing are indicated by solid lines, and the energizing lines through which electricity is not flowing are indicated by broken lines.

FIG. 6 is a schematic diagram showing the flow of electricity in the energization mode during navigation. During navigation, the main engine 21 rotates the propeller 11 via the rotating shaft 12 in order to propel the ship 1 . At this time, the shaft generator 24 converts the rotational force of the rotating shaft 12 into electric power to generate electric power. The shaft generator 24 supplies electric power to the main switchboard 22 via the power supply line L3. The main switchboard 22 supplies power to other devices 29 through the power supply line L5. Further, the main switchboard 22 supplies electric power to the storage battery 30 via the power supply line L1. Thereby, the storage battery 30 stores the electric power generated by the shaft generator 24 .

FIG. 7 is a schematic diagram showing the flow of electricity in the energization mode during cargo handling. During cargo handling, the main engine 21 is stopped because the ship is stopped at a harbor. The storage battery 30 supplies electric power to the main switchboard 22 via the electricity supply line L1 by discharging. The main switchboard 22 supplies electric power to the cargo oil pump motor 26 via the power supply line L4. As a result, the cargo oil pump 27 is activated to perform cargo handling work. The main switchboard 22 supplies power to other devices 29 through the power supply line L5. At this time, the shaft generator 24 and the diesel generator 23 have stopped generating power. Therefore, the use of boilers and generators in harbors is reduced, and smoke generated in harbors can be reduced.

FIG. 8 is a schematic diagram showing the flow of electricity in the energization mode during low-speed voyage in harbors. Since it is preferable to refrain from using the main engine 21 and the generator in harbors from the viewpoint of reducing air pollution, the main engine 21 and the diesel generator 23 are stopped. Therefore, by using the electric power of the storage battery 30, the ship 1 is propelled at a low speed. Specifically, the storage battery 30 supplies electric power to the main switchboard 22 via the electricity supply line L1 by discharging. The main switchboard 22 supplies electric power to the shaft generator 24 via the power supply line L3. As a result, the shaft generator 24 operates as a motor and imparts rotational force to the rotating shaft 12 . Therefore, the propeller 11 rotates at a low speed as much as possible with the electric power of the storage battery 30 . The main switchboard 22 supplies power to other devices 29 through the power supply line L5. As described above, the main engine 21 and diesel generator 23 are stopped. Therefore, the use of boilers and generators in harbors is reduced, and smoke generated in harbors can be reduced.

FIG. 9 is a schematic diagram showing the flow of electricity in the energization mode when the shaft generator 24 fails or when the capacity of the storage battery 30 decreases. At this time, as shown in FIG. 8, the shaft generator 24 cannot generate power. Accordingly, the diesel generator 23 generates power and supplies the power to the main switchboard 22 through the power supply line L2. The main switchboard 22 supplies power to other devices 29 through the power supply line L5.

Next, actions and effects of the ship 1 according to this embodiment will be described.

The ship 1 includes a storage battery 30 that stores electric power. The storage battery 30 can store electric power generated by a predetermined power in the ship 1 , for example, high-efficiency power of the main engine 21 that rotates the propeller 11 . In addition, the storage battery 30 can supply the stored electric power at appropriate timing for the operation of various devices. Here, the storage battery 30 is arranged in the steering gear room 7 (ventilation room). In this way, by suppressing the provision of a new dedicated battery room for arranging the storage battery 30 and by arranging the storage battery 30 in the steering gear room 7 which is the existing space in the ship 1, the ship can be saved. Space can be saved. In addition, the steering gear room 7 is provided with an existing ventilation mechanism (ventilation unit 33 that can be ventilated by a fan), in contrast to the place where the storage battery 30 is arranged that requires ventilation. Therefore, by arranging the storage battery 30 in the steering gear room 7 and using an existing ventilation mechanism, it is possible to suppress an increase in the size of the ship 1 and an increase in equipment due to an increase in equipment. As described above, the storage battery 30 can be effectively used while suppressing an increase in size.

The storage battery 30 may be arranged on the bow side of the steering gear 16 . The steering gear 16 is arranged directly above the rudder 4 provided on the stern side. Therefore, in the steering gear room 7 , there is more space on the bow side than on the stern side with respect to the steering gear 16 . In this way, by arranging the storage battery 30 in a place with sufficient space, the degree of freedom in arrangement can be improved.

The steering gear room 7 is configured on multiple floors, and the storage battery may be arranged on at least one of the floors. In this case, the space in the height direction of the steering gear room 7 can also be effectively used to dispose the storage battery 30 .

The storage battery 30 may be capable of storing electric power generated by the rotation of the rotating shaft 12 of the propeller 11 of the propulsion shaft system 3 . A rotating shaft 12 of the propeller 11 is rotated by the power of a highly efficient main engine 21 . Therefore, the shaft generator 24 can convert a part of the power of the highly efficient main engine 21 into electric power and recover it, and the storage battery 30 can store the electric power.

The storage battery 30 may be capable of supplying electric power to a device (shaft generator 24 ) that rotates the rotating shaft 12 of the propeller 11 of the propulsion shaft system 3 . For example, when propelling the ship 1 at a low speed in a harbor, the main engine 21 can be stopped and the propeller 11 can be rotated by the electric power of the storage battery 30 . Since the main engine 21 can be kept stopped in this way, it is possible to suppress the generation of smoke in harbors and the like, and to reduce air pollution in the harbors.

The storage battery 30 may be capable of supplying power to equipment (cargo oil pump 27) that operates during cargo handling. For example, when the cargo oil pump 27 that operates during cargo handling is driven by a turbine driven by steam from a boiler or by a motor driven by electric power from a generator, the boiler or generator that serves as a drive source is used even though it is used only during cargo handling. need to be enlarged. On the other hand, by using the electric power stored in the storage battery 30 for the cargo oil pump 27 that operates during cargo handling, it is possible to suppress the increase in size of the drive source as described above. In addition, the generation of smoke in ports and harbors can be suppressed, and air pollution in ports and harbors can be reduced.

Vessel 1 may be a tanker. As a result, it is possible to suppress the increase in size of the tanker and effectively utilize the storage battery in the tanker.

The invention is not limited to the embodiments described above.

For example, the arrangement of the storage battery 30 in the steering gear room 7 shown in FIGS. 3 and 4 is merely an example, and may be changed as appropriate without departing from the gist of the present invention.

Also, the configuration of the electrical system of the ship 1 and the mode of energization shown in FIGS. 5 to 9 are merely examples, and may be changed as appropriate without departing from the gist of the present invention.

In addition, in the above-described embodiment, a ship is used as a tanker as it is particularly suitable, but it can also be applied to a dual-purpose ship that can load not only oil but also solid cargo (bulk) such as ore and coal, etc. .

In the above-described embodiments, the steering gear room was exemplified as the ventilation room. However, the ventilation room may be a room with at least a fan function. Such a ventilation room may correspond not only to the steering gear room but also to an engine room equipped with a ventilation mechanism such as a fan. Therefore, a storage battery may be provided in the engine room.

DESCRIPTION OF SYMBOLS 1... Ship (tanker), 3... Propulsion shaft system, 4... Rudder, 7... Steering gear room (ventilation room), 11... Propeller, 12... Rotating shaft, 16... Steering gear, 30... Storage battery.

Claims (8)

a ventilation room in which a ventilation mechanism is provided;
and a storage battery for storing electric power,
The marine vessel, wherein the storage battery is arranged in the ventilation room. The ventilation room is a steering gear room in which a steering gear for operating the rudder is arranged,
2. A marine vessel according to claim 1, wherein said storage battery is arranged in said steering gear compartment. The ship according to claim 2, wherein said storage battery is arranged on the bow side of said steering gear. 4. The ship according to claim 2 or 3, wherein said steering gear room is arranged in a plurality of floors, and said storage battery is arranged in at least one of the floors. The ship according to any one of claims 1 to 4, wherein the storage battery is capable of storing electric power generated by rotation of the rotating shaft of the propeller of the propulsion shaft system. The ship according to any one of claims 1 to 5, wherein said storage battery can supply electric power to a device that rotates a rotating shaft of a propeller of a propulsion shaft system. The vessel according to any one of claims 1 to 5, wherein the storage battery can supply power to equipment that operates during cargo handling. A vessel according to any preceding claim, wherein said vessel is a tanker.

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