Ship, and fuel supply system to ship

Abstract

This ship is provided with: a hull; fuel gas consumption equipment provided on the hull; a fixed tank fixed to the hull and capable of supplying fuel to the fuel gas consumption equipment; and a tank mounting part for detachably mounting a portable tank loaded from the outside of the hull, and capable of storing fuel to be supplied only to the fixed tank out of the gas consumption equipment and the fixed tank.

Description

Ships and ship fuel supply systems

[0001] This application claims priority to Japanese Patent Application No. 2023-142431, filed on September 1, 2023, the contents of which are incorporated herein by reference.

[0002] For example, as disclosed in Patent Document 1, a ship that uses liquefied gas as fuel is equipped with a fuel tank that can store the liquefied gas. In such a ship, liquefied gas is loaded into the fuel tank before departure from a port. To load the fuel tank, a bunker ship or a tank truck (vehicle) equipped with a tank that can store the liquefied gas is used.

[0003] JP 2018-69934 A

[0004] However, as in Patent Document 1, in order to load liquefied gas from the tank of a bunker ship or tank truck into the fuel tank of a ship, it is necessary to connect the tank of the bunker ship or tank truck to the fuel tank of the ship with a fuel pipe (hose), which is time-consuming and labor-intensive.In addition, while liquefied gas is being loaded from the tank of the bunker ship or tank truck into the fuel tank of the ship, the ship cannot depart, which results in a longer anchorage time for the ship.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a ship and a fuel supply system for the ship that can efficiently load fuel onto the ship and shorten the ship's berthing time.

[0006] In order to solve the above problems, the ship according to the present disclosure comprises a hull, a fuel gas consuming device, a fixed tank, and a tank mounting section. The fuel gas consuming device is provided on the hull. The fixed tank is fixed to the hull and is capable of supplying fuel to the fuel gas consuming device. The tank mounting section detachably mounts a portable tank that is loaded from outside the hull. The portable tank is capable of storing fuel to be supplied only to the fixed tank out of the fuel gas consuming device and the fixed tank.

[0007] A fuel supply system for a vessel according to the present disclosure includes the vessel described above and a portable tank, the portable tank being mountable on the tank mounting section.

[0008] According to the ship and fuel supply system for the ship disclosed herein, fuel can be loaded onto the ship efficiently, and the ship's berthing time can be shortened.

[0009] 10 is a side view of a vessel and a fuel supply system for the vessel according to an embodiment of the present disclosure. FIG. 11 is a plan view showing the configuration of a fuel supply system for a vessel according to an embodiment of the present disclosure. FIG. 12 is a view showing a tank mounting unit and a portable tank mounted on the tank mounting unit according to an embodiment of the present disclosure. FIG. 13 is a side view of the tank mounting unit and the portable tank shown in FIG. 3. FIG. 14 is a plan view showing a liquefied gas supply line connecting a fixed tank and a portable tank according to an embodiment of the present disclosure. FIG. 15 is a view showing a state in which liquefied gas as fuel is supplied from one portable tank to the fixed tank in the fuel supply system according to an embodiment of the present disclosure. FIG. 16 is a view showing a state in which liquefied gas as fuel is supplied from another portable tank different from that shown in FIG. 6 to the fixed tank in the fuel supply system according to an embodiment of the present disclosure. FIG. 17 is a view showing a connection state between the fixed tank and the portable tank according to a second embodiment of the present disclosure. FIG. 18 is a view showing a connection state between the fixed tank and the portable tank according to a third embodiment of the present disclosure. FIG. 19 is a view showing a connection state between the fixed tank and the portable tank according to a fourth embodiment of the present disclosure. FIG. 19 is a view showing a state in which the inside of the portable tank is pressurized through a pressurization line in the configuration shown in FIG. 10. FIG. 19 is a view showing a state in which the pressure in the portable tank is adjusted through a pressure adjustment line in the configuration shown in FIG. 10. FIG. 10 is a diagram illustrating a connection state between a fixed tank and a portable tank in a modified example of the fourth embodiment of the present disclosure.

[0010] First Embodiment A ship and a fuel supply system for the ship according to an embodiment of the present disclosure will be described below with reference to Figures 1 to 13. (Overall Configuration of the Ship) As shown in Figures 1 and 2, the ship 1 of this embodiment includes at least a hull 2, a fixed tank 20, and a tank mounting unit 30. The type of ship 1 is not limited to a specific one. Examples of the type of ship 1 include a carrier of liquefied gases such as liquefied natural gas (LNG), carbon dioxide, and ammonia, a cargo ship, a ferry, a roll-on / roll-off ship (RORO ship), a pure car and truck carrier (PCTC), a passenger ship, and an observation / research vessel.

[0011] (Hull Structure) The hull 2 ​​has a pair of side walls 3A, 3B that form its outer shell, a bottom wall 4, and an upper deck 5. The side walls 3A, 3B are made up of a pair of side wall shell plates that form the port and starboard sides, respectively. The bottom wall 4 is made up of a bottom wall shell plate that connects the side walls 3A, 3B. The upper deck 5 is a full-length deck that is exposed to the outside. The hull 2 ​​has a superstructure 7 with accommodation areas formed on the upper deck 5, for example, on the stern 2b side.

[0012] Fuel gas consumers 8 are provided within the hull 2. The fuel gas consumers 8 are devices that generate thermal energy by burning fuel. Examples of the fuel gas consumers 8 include an internal combustion engine used as the main engine for propelling the ship 1, 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.

[0013] The fixed tank 20 is provided, for example, on the upper deck 5. The fixed tank 20 is provided, for example, on the stern 2b side of the superstructure 7 in the hull 2. The fixed tank 20 may also be provided on the bow 2a side of the superstructure 7 in the hull 2. The fixed tank 20 may also be provided inside the hull 2.

[0014] The fixed tank 20 stores fuel to be burned in the fuel gas consuming equipment 8. The fixed tank 20 of this embodiment can store liquefied gas, such as LNG (liquefied natural gas), LPG (liquefied petroleum gas), ammonia, hydrogen, etc., as fuel to be burned in the fuel gas consuming equipment 8. The fixed tank 20 of this embodiment has, for example, a cylindrical shape extending horizontally and is provided so as to extend in the bow-stern direction FA. Furthermore, the shape of the fixed tank 20 is not limited to a cylindrical shape, and the fixed tank 20 may be, for example, spherical, rectangular, etc. The fixed tank 20 is connected to the fuel gas consuming equipment 8 via a fuel supply piping system 25. The fixed tank 20 can supply fuel to the fuel gas consuming equipment 8 via the fuel supply piping system 25.

[0015] (Configuration of Tank Mounting Unit) The tank mounting unit 30 detachably mounts a portable tank 40 (described later). The tank mounting unit 30 is provided, for example, on the upper deck 5. In this embodiment, the tank mounting unit 30 is provided, for example, between the superstructure 7 and the fixed tank 20. The installation position of the tank mounting unit 30 is not limited in any way, and for example, the tank mounting unit 30 may be provided closer to the bow 2a of the hull 2 ​​than the superstructure 7. In this embodiment, multiple tank mounting units 30 are provided. As shown in FIG. 2, this embodiment illustrates a case where, for example, four sets of tank mounting units 30A to 30D are provided at intervals in the ship's width direction Dw. The arrangement and number of the multiple tank mounting units 30 can be changed as appropriate.

[0016] Fig. 3 is a diagram showing a tank mounting section and a portable tank mounted on the tank mounting section according to an embodiment of the present disclosure. Fig. 4 is a side view of the tank mounting section and the portable tank shown in Fig. 3. As shown in Figs. 3 and 4, each tank mounting section 30 is capable of mounting a portable tank 40 that is loaded from outside the hull 2. The tank mounting section 30 has a tank support surface 30f facing upward. When the portable tank 40 is mounted on the tank support surface 30f, the tank support surface 30f can support the portable tank 40 from below. Note that the tank support surface 30f may be provided with a protrusion or the like for fixing the portable tank 40 to the tank.

[0017] 4 , each tank mounting section 30 can secure a portable tank 40 thereon using a fastening member 100 such as a lashing rod, with the portable tank 40 being mounted thereon. By using a lashing rod or the like used for fastening containers as the fastening member 100, the portable tank 40 can be easily attached to and detached from the tank mounting section 30.

[0018] Fig. 5 is a plan view showing a liquefied gas supply line connecting a fixed tank and a portable tank in an embodiment of the present disclosure. As shown in Fig. 5, the ship 1 is provided with a liquefied gas supply line 50 connecting the portable tanks 40 mounted on each tank mounting unit 30 and the fixed tank 20. The liquefied gas supply line 50 is capable of supplying liquefied gas in a liquid state from the portable tanks 40 mounted on the tank mounting unit 30 to the fixed tank 20. For example, one end of the liquefied gas supply line 50 is fixedly connected to the fixed tank 20. The other end of the liquefied gas supply line 50 is detachably connected to the portable tank 40 mounted on the tank mounting unit 30.

[0019] The liquefied gas supply line 50 is provided so as to be able to connect the portable tanks 40 mounted on each of the plurality of tank mounting sections 30 to the fixed tank 20. In this embodiment, the liquefied gas supply line 50 has a plurality of branch pipes 51 (51A to 51D) that branch into a plurality of pipes on the tank mounting section 30 side (the other end side). Each of the branch pipes 51A to 51D is detachably connected to each of the portable tanks 40 mounted on the plurality of tank mounting sections 30.

[0020] The vessel 1 further includes a connection switching unit 60. The connection switching unit 60 selectively connects the portable tank 40 mounted on any one of the multiple tank mounting units 30 to the fixed tank 20. The connection switching unit 60 of this embodiment includes multiple on-off valves 61 (61A to 61D). The on-off valve 61A is provided on a branch pipe 51A that can be connected to the portable tank 40 mounted on the tank mounting unit 30A. The on-off valve 61B is provided on a branch pipe 51B that can be connected to the portable tank 40 mounted on the tank mounting unit 30B. The on-off valve 61C is provided on a branch pipe 51C that can be connected to the portable tank 40 mounted on the tank mounting unit 30C. The on-off valve 61D is provided on a branch pipe 51D that can be connected to the portable tank 40 mounted on the tank mounting unit 30D. The connection switching unit 60 selectively connects the portable tank 40 mounted on any one of the multiple tank mounting units 30 to the fixed tank 20 by opening any one of the on-off valves 61A to 61D and closing the other on-off valves 61.

[0021] (Configuration of Portable Tank) The portable tank 40 is loaded from outside the hull 2. In other words, the portable tank 40 does not constitute the ship 1. As shown in Figures 3 and 4 , the portable tank 40 includes a tank body 41 and a container frame 42.

[0022] The tank body 41 is a pressure vessel capable of storing fuel therein. The tank body 41 is capable of storing liquefied gas as fuel to be supplied to the fixed tank 20. More specifically, the tank body 41 is connected to the fixed tank 20 via the liquefied gas supply line 50, thereby being capable of storing fuel (liquefied gas) to be supplied only to the fixed tank 20 out of the fuel gas consuming equipment 8 and the fixed tank 20. The tank body 41 of this embodiment has, for example, a cylindrical shape extending horizontally. Furthermore, the shape of the tank body 41 is not limited to a cylindrical shape, and the tank body 41 may be, for example, spherical, rectangular, or the like.

[0023] The container frame 42 supports the tank body 41 via, for example, a support base 44. The container frame 42 illustrated in this embodiment has external dimensions similar to those of a 20-foot container or a 40-foot container, which are ISO standard containers. This allows the portable tank 40 to be transported overland by a vehicle such as a trailer, or lifted by a lifting device (not shown) such as a crane, just like a 20-foot container or a 40-foot container.

[0024] The container frame 42 includes, for example, a lower frame 42a, multiple support columns 42b, and an upper frame 42c. When viewed from the vertical direction Dv, the lower frame 42a is formed into a rectangular frame shape with a long side in a first direction Da intersecting the vertical direction Dv and a short side in a second direction (a direction perpendicular to the plane of the paper in FIG. 3 ) intersecting the vertical direction Dv and the first direction Da. The multiple support columns 42b are provided at at least four corners of the lower frame 42a. The support columns 42b may be provided at other locations in addition to the four corners of the lower frame 42a. Each support column 42b rises upward from the lower frame 42a in the vertical direction Dv. The upper frame 42c is provided on the multiple support columns 42b. Like the lower frame 42a, when viewed from the vertical direction Dv, the upper frame 42c is formed into a rectangular frame shape with a long side in the first direction Da and a short side in the second direction. The upper frame 42c connects the upper ends of the multiple struts 42b together. The container frame 42 can be fastened to the tank mounting section 30 by fastening members 100 such as lashing rods. The container frame 42 also has locking sections 43 for locking wire cables W or the like, and can be lifted by a lifting device. The configuration of the container frame 42 can be modified as appropriate. The container frame 42 may also be in the shape of a hollow box. The tank body 41 is provided within such a container frame 42.

[0025] The ship 1 and the portable tank 40 as described above constitute a fuel supply system 10A for the ship 1. In the fuel supply system 10A, liquefied gas as fuel is stored in advance in the tank body 41 of the portable tank 40 outside the ship 1. The portable tank 40 storing the liquefied gas is loaded onto a vehicle such as a trailer and transported to the port (quay) where the ship 1 is anchored. The portable tank 40 is then lifted and loaded onto the ship 1 using a lifting device such as a crane provided at the port or a crane provided on the ship 1. The portable tank 40 is mounted on a tank mounting unit 30 provided on the upper deck 5. In this embodiment, multiple tank mounting units 30 are provided, and multiple portable tanks 40 are sequentially mounted on the multiple tank mounting units 30. After each portable tank 40 is mounted on the tank mounting unit 30, the portable tank 40 is secured with a securing member 100. Thereafter, the portable tank 40 and the fixed tank 20 are connected via the liquefied gas supply line 50. After the connection work of the liquefied gas supply line 50 is completed, the on-off valve 61 of the branch pipe 51 connected to the portable tank 40 is opened, thereby connecting the portable tank 40 and the fixed tank 20, and the liquefied gas stored in the portable tank 40 is supplied to the fixed tank 20.

[0026] FIG. 6 is a diagram illustrating a state in which liquefied gas as fuel is delivered from one portable tank to a fixed tank in a fuel supply system according to an embodiment of the present disclosure. FIG. 7 is a diagram illustrating a state in which liquefied gas as fuel is delivered from another portable tank to a fixed tank, different from that shown in FIG. 6, in a fuel supply system according to an embodiment of the present disclosure. Here, in the connection switching unit 60, for example, as shown in FIG. 6, by opening the on-off valve 61A and closing the other on-off valves 61B to 61D, the portable tank 40 mounted on one tank mounting unit 30A and the fixed tank 20 are connected through the branch pipe 51A provided with the on-off valve 61A. As a result, the liquefied gas as fuel is delivered from the portable tank 40 mounted on the one tank mounting unit 30A to the fixed tank 20.

[0027] 7, for example, by opening the on-off valve 61B and closing the other on-off valves 61A, 61C, and 61D, the portable tank 40 mounted on another tank mounting section 30B different from that shown in Fig. 6 is connected to the fixed tank 20 through the branch pipe 51B provided with the on-off valve 61B. As a result, liquefied gas as fuel is supplied from the portable tank 40 mounted on the other tank mounting section 30B to the fixed tank 20.

[0028] Similarly, by opening the on-off valve 61C and closing the other on-off valves 61A, 61B, and 61D, the portable tank 40 mounted on yet another tank mounting section 30C is connected to the fixed tank 20 through the branch pipe 51C provided with the on-off valve 61C. This allows liquefied gas as fuel to be supplied from the portable tank 40 mounted on yet another tank mounting section 30C to the fixed tank 20. By opening the on-off valve 61D and closing the other on-off valves 61A, 61B, and 61C, the portable tank 40 mounted on yet another tank mounting section 30D is connected to the fixed tank 20 through the branch pipe 51D provided with the on-off valve 61D. This allows liquefied gas as fuel to be supplied from the portable tank 40 mounted on yet another tank mounting section 30D to the fixed tank 20. In this way, by sequentially switching the opening and closing of the on-off valves 61A to 61D using the connection switching unit 60, liquefied gas can be sequentially supplied from the portable tank 40 mounted on any one of the multiple tank mounting units 30 to the fixed tank 20.

[0029] Here, when the portable tanks 40 are sequentially mounted on the multiple tank mounting sections 30, the supply of liquefied gas to the fixed tanks 20 may be started from a portable tank 40 that has been secured to the tank mounting section 30 and connected to the liquefied gas supply line 50, even if the mounting of the other portable tanks 40 has not been completed. Furthermore, after all the portable tanks 40 have been mounted on the tank mounting sections 30 and secured, the ship 1 may depart from the port even if the connection of the portable tanks 40 to the liquefied gas supply line 50 has not been completed.

[0030] (Operation and Effect) The ship 1 and the fuel supply system 10A for the ship 1 according to the above embodiment are provided with the tank mounting unit 30 on which the portable tank 40 is detachably mounted. Therefore, the portable tank 40, which previously stores liquefied gas as fuel, can be brought in from outside the ship and mounted on the tank mounting unit 30, and the liquefied gas stored in the portable tank 40 mounted on the tank mounting unit 30 can be supplied to the fixed tank 20. To supply liquefied gas from the portable tank 40 to the fixed tank 20, the portable tank 40 and the fixed tank 20 must be connected, but this connection work can be performed on board the ship. Furthermore, the supply of liquefied gas from the portable tank 40 to the fixed tank 20 can also be performed on board the ship. Therefore, the connection work between the portable tank 40 and the fixed tank 20 and the supply of liquefied gas can be performed even after the ship 1 has departed. This prevents the ship 1 from being hindered from departing due to the need to connect the piping or supply the liquefied gas. As a result, liquefied gas can be loaded onto the ship 1 efficiently, and the time the ship 1 is anchored can be shortened.

[0031] Furthermore, in the above embodiment, the vessel 1 is provided with the liquefied gas supply line 50, and by connecting the portable tank 40 mounted on the tank mounting section 30 to the fixed tank 20 via the liquefied gas supply line 50, it is possible to supply liquefied gas in a liquid state from the portable tank 40 to the fixed tank 20. This allows the work of connecting the portable tank 40 and the fixed tank 20 to be carried out efficiently.

[0032] In the above embodiment, the liquefied gas supply line 50 is provided to be able to connect the portable tank 40 mounted on each of the multiple tank mounting units 30 to the fixed tank 20. The connection switching unit 60 selectively connects the portable tank 40 mounted on any one of the multiple tank mounting units 30 to the fixed tank 20. As a result, by first connecting the portable tank 40 mounted on one of the multiple portable tanks 40 mounted on the multiple tank mounting units 30 to the fixed tank 20 using the connection switching unit 60, liquefied gas in liquid state can be supplied from the portable tank 40 mounted on the one tank mounting unit 30 to the fixed tank 20. Thereafter, by connecting the portable tank 40 mounted on another of the multiple portable tanks 40 mounted on the multiple tank mounting units 30 to the fixed tank 20 using the connection switching unit 60, liquefied gas in liquid state can be supplied from the portable tank 40 mounted on the other tank mounting unit 30 to the fixed tank 20. In this way, liquefied gas in a liquid state can be sequentially supplied to the fixed tank 20 from the multiple portable tanks 40 mounted on the multiple tank mounting sections 30. Furthermore, by mounting multiple portable tanks 40 on the multiple tank mounting sections 30, the total amount of liquefied gas carried as fuel on the vessel 1 can be increased. This allows the multiple portable tanks 40 to function as, so to speak, auxiliary tanks, and makes it possible to reduce the size of the fixed tank 20 by the amount of liquefied gas stored in the multiple portable tanks 40.

[0033] In the above embodiment, the container frame 42 of the portable tank 40 can be lifted by a lifting device, thereby enabling the portable tank 40 to be loaded onto or unloaded from the ship 1. Furthermore, by fastening the container frame 42 of the portable tank 40 to the tank mounting unit 30, the portable tank 40 can be detachably mounted on the tank mounting unit 30. Such a container frame 42 can have the same structure as a so-called container, and can be easily realized at low cost.

[0034] Second Embodiment Next, a second embodiment of a vessel and a fuel supply system for a vessel according to the present disclosure will be described. In the second embodiment described below, the connection state between the portable tank 40 mounted on the tank mounting unit 30 and the fixed tank 20 differs from that in the first embodiment. Therefore, the same components as in the first embodiment will be denoted by the same reference numerals and will not be described again. FIG. 8 is a diagram showing the connection state between the fixed tank and the portable tank in the second embodiment of the present disclosure. As shown in FIG. 8 , in the vessel 1 and the fuel supply system 10B for the vessel 1 according to this embodiment, the tank mounting unit 30P mounts the portable tank 40 at a position higher in the vertical direction Dv than the fixed tank 20. For example, if the tank mounting unit 30P is provided on the upper deck 5 and the fixed tank 20 is provided within the hull 2 ​​below the upper deck 5, the tank mounting unit 30P mounts the portable tank 40 at a position higher in the vertical direction Dv than the fixed tank 20. Furthermore, even if the fixed tank 20 is installed on the upper deck 5, the tank support surface 30f of the tank mounting section 30P may be installed at a higher position in the vertical direction Dv than the fixed tank 20.

[0035] The fixed tank 20 and the portable tank 40 mounted on the tank mounting section 30P are connected by a liquefied gas supply line 50P and a gas return line 52P. The liquefied gas supply line 50P is provided to communicate the liquid phase in the fixed tank 20 with the liquid phase in the portable tank 40 mounted on the tank mounting section 30P. An on-off valve 61P is provided on the liquefied gas supply line 50P. The gas return line 52P is provided to communicate the gas phase in the fixed tank 20 with the gas phase in the portable tank 40 mounted on the tank mounting section 30P. An on-off valve 62P is provided on the gas return line 52P.

[0036] When the on-off valves 61P and 62P are opened, the liquefied gas in liquid state in the portable tank 40 is sent by gravity to the liquid phase of the fixed tank 20 below. When the liquid level of the liquid phase in the fixed tank 20 rises due to the liquefied gas being sent to the fixed tank 20, the liquefied gas in gas state in the fixed tank 20 is pushed out of the fixed tank 20. The pushed-out liquefied gas in gas state is returned to the gas phase in the portable tank 40 above through the gas return line 52P. In other words, the pressures of the gas phases of the fixed tank 20 and the portable tank 40 are equalized.

[0037] (Effects) According to the second embodiment of the ship 1 and the fuel supply system 10B for the ship 1, the tank mounting section 30P mounts the portable tank 40 at a higher position in the vertical direction Dv than the fixed tank 20, so that liquefied gas in a liquid state can be efficiently supplied from the portable tank 40 to the fixed tank 20 by utilizing gravity.

[0038] In the vessel 1 and the fuel supply system 10B for the vessel 1 according to the second embodiment, as in the first embodiment, the vessel 1 can be efficiently loaded with liquefied gas, thereby shortening the time the vessel 1 is at anchor.

[0039] Here, when multiple portable tanks 40 are connected to the fixed tank 20, the on-off valve 61P is opened only in the liquefied gas supply line 50P connected to the portable tank 40 that supplies liquefied gas to the fixed tank 20. In the gas return line 52P, the on-off valve 62P may be opened only in the gas return line 52P connected to the portable tank 40 that returns the liquefied gas in gas state inside the fixed tank 20. Also, the on-off valve 62P may be opened in the gas return line 52P connected to the multiple portable tanks 40. This allows the gas phase inside the fixed tank 20 to communicate with the gas phases inside the multiple portable tanks 40, allowing the pressure inside the multiple portable tanks 40 to be adjusted.

[0040] Third Embodiment Next, a third embodiment of a vessel and a fuel supply system for a vessel according to the present disclosure will be described. In the third embodiment described below, the connection state between the portable tank 40 mounted on the tank mounting unit 30 and the fixed tank 20 differs from that of the first and second embodiments. Therefore, the same parts as those in the first and second embodiments will be denoted by the same reference numerals and will not be described again. Figure 9 is a diagram showing the connection state between the fixed tank and the portable tank according to the third embodiment of the present disclosure. As shown in Figure 9, the vessel 1 and the fuel supply system 10C for the vessel 1 according to the third embodiment include a pressurized line 70Q and a depressurized line 80Q.

[0041] The pressurized line 70Q sends gas at a pressure higher than the pressure inside the portable tank 40 to the portable tank 40 mounted on the tank mounting unit 30. The pressurized line 70Q of this embodiment sends liquefied gas in a gaseous state supplied from the fixed tank 20 to the fuel gas consuming equipment 8 to the gas phase of the portable tank 40. The liquefied gas in a gaseous state supplied from the fixed tank 20 to the fuel gas consuming equipment 8 is pressurized by a pump (not shown) and further vaporized by an evaporator (not shown) to a pressure equal to or higher than a predetermined pressure higher than the pressure inside the portable tank 40. Furthermore, when sending gas at a pressure higher than the pressure inside the portable tank 40 to the portable tank 40 through the pressurized line 70Q, the pressures inside the fixed tank 20 and the portable tank 40 may be equalized in advance. In this way, by sending liquefied gas in a gaseous state at a pressure higher than the pressure inside the portable tank 40 through the pressurized line 70Q into the gas phase inside the portable tank 40, the liquefied gas in a liquid state inside the portable tank 40 is sent to the fixed tank 20 through the liquefied gas supply line 50.

[0042] The decompression line 80Q discharges the gaseous liquefied gas in the fixed tank 20 to the outside of the fixed tank 20. The decompression line 80Q is connected to, for example, a fuel gas consuming device 8, a gas combustion device (not shown) that burns excess gas, or the like. The gaseous liquefied gas in the fixed tank 20 is supplied to the fuel gas consuming device 8, the gas combustion device (not shown), or the like through the decompression line 80Q and burned, thereby reducing the pressure inside the fixed tank 20. In this manner, a pressure difference can be generated between the portable tank 40 and the fixed tank 20. Note that, in the description of the third embodiment, the case where both the pressurization of the portable tank 40 by the pressurization line 70Q and the decompression of the fixed tank 20 by the decompression line 80Q are performed is exemplified. However, by performing at least one of these, the liquefied gas can be sent from the portable tank 40 to the fixed tank 20. In addition, in the above third embodiment, an example was given of a case where the pressurized line 70Q sends the gaseous liquefied gas supplied from the fixed tank 20 to the fuel gas consuming equipment 8 to the gas phase of the portable tank 40, but the liquefied gas sent to the gas phase of the portable tank 40 is not limited to the gaseous liquefied gas supplied from the fixed tank 20 to the fuel gas consuming equipment 8.

[0043] (Effects) According to the ship 1 and the fuel supply system 10C for the ship 1 of the third embodiment, gas at a pressure higher than the pressure inside the portable tank 40 is sent to the portable tank 40 via the pressurized line 70Q, thereby efficiently supplying liquefied gas in a liquid state from the portable tank 40 to the fixed tank 20.

[0044] Furthermore, when the pressurized line 70Q of the third embodiment sends liquefied gas in a gaseous state within the fixed tank 20 to the portable tank 40, the liquefied gas in a liquid state can be efficiently supplied from the portable tank 40 to the fixed tank 20. Furthermore, when the liquefied gas in a gaseous state within the fixed tank 20 is used as gas with a pressure higher than that within the portable tank 40, the need to provide a pump or the like for transferring the liquefied gas in a liquid state from the portable tank 40 to the fixed tank 20 is reduced.

[0045] In the vessel 1 and the fuel supply system 10C for the vessel 1 of the third embodiment, as in the first and second embodiments, the vessel 1 can be efficiently loaded with liquefied gas, thereby shortening the berthing time of the vessel 1.

[0046] Fourth Embodiment Next, a fourth embodiment of a vessel and a fuel supply system for a vessel according to the present disclosure will be described. In the fourth embodiment described below, the connection state between the portable tank 40 mounted on the tank mounting unit 30 and the fixed tank 20 differs from that of the first to third embodiments. Therefore, the same parts as those in the first to third embodiments will be denoted by the same reference numerals and will not be described again. Figure 10 is a diagram showing the connection state between the fixed tank and the portable tank according to the fourth embodiment of the present disclosure. As shown in Figure 10, the vessel 1 and the fuel supply system 10D for the vessel 1 according to the fourth embodiment include a pressurized line 70R, a reduced pressure line 80R, and a pressure adjustment line 90R.

[0047] The pressurized line 70R sends gas to the portable tank 40 mounted on the tank mounting unit 30 at a pressure higher than the pressure inside the portable tank 40. The pressurized line 70R of this embodiment is provided to communicate the gas phase inside the portable tank 40 with the fuel supply piping system 25R, which supplies liquefied gas as fuel to the fuel gas consuming equipment 8.

[0048] The fuel supply piping system 25R is provided with a gas vaporizer 27. The gas vaporizer 27 vaporizes the liquefied gas in the fixed tank 20 and supplies it to the fuel gas consuming equipment 8. The gas vaporizer 27 includes a pump 28 and an evaporator 29. The pump 28 pressurizes the liquid liquefied gas supplied from the liquid phase in the fixed tank 20. The evaporator 29 evaporates the pressurized liquid liquefied gas. In this way, the gaseous liquefied gas vaporized by the gas vaporizer 27 is made to have a higher pressure than the gaseous phase in the portable tank 40. The pressurized line 70R is provided with an on-off valve 71R. When the on-off valve 71R is opened, the gaseous phase in the portable tank 40 and the fuel supply piping system 25R are connected to each other.

[0049] The decompression line 80R discharges the liquefied gas in a gaseous state from the fixed tank 20 to the outside of the fixed tank 20. The decompression line 80R is connected to, for example, a fuel gas consuming device 8. The liquefied gas in a gaseous state from the fixed tank 20 can be supplied to the fuel gas consuming device 8 through the decompression line 80R and burned as liquefied gas, thereby reducing the pressure inside the fixed tank 20.

[0050] The pressure adjustment line 90R is provided to communicate between the pressurized line 70R and the depressurized line 80R. One end of the pressure adjustment line 90R is connected to the pressurized line 70R on the portable tank 40 side of the on-off valve 71R. The pressure adjustment line 90R is provided with an on-off valve 91R.

[0051] 11 is a diagram showing the state in which the inside of the portable tank is pressurized through the pressurization line in the configuration shown in FIG. 11 . As shown in FIG. 11 , the on-off valve 91R is closed when the on-off valve 71R of the pressurization line 70R is open and the inside of the portable tank 40 is pressurized. When the on-off valve 71R is open, the gas phase inside the portable tank 40 is connected to the fuel supply piping system 25R, and at least a portion of the liquefied gas vaporized in the gas vaporizer 27 is sent to the gas phase of the portable tank 40 through the pressurization line 70R. This pressurizes the inside of the portable tank 40, and the liquefied gas in liquid state is efficiently supplied from the portable tank 40 to the fixed tank 20 through the liquefied gas supply line 50R.

[0052] Fig. 12 is a diagram showing the state in which the pressure inside the portable tank is adjusted through the pressure adjustment line in the configuration shown in Fig. 10. As shown in Fig. 12, the on-off valve 91R is opened as necessary when the on-off valve 71R is closed and the portable tank 40 is not pressurized. By opening the on-off valve 91R, the gas phase of the fixed tank 20 and the gas phase of the portable tank 40 are communicated through the pressure adjustment line 90R, thereby equalizing the pressure inside the fixed tank 20 and the portable tank 40. Furthermore, when the pressure inside the portable tank 40 is higher than the pressure in the decompression line 80R, the liquefied gas in the gaseous state inside the portable tank 40 can be supplied to the fuel gas consuming appliance 8 through the pressure adjustment line 90R.

[0053] (Effects) According to the ship 1 and the fuel supply system 10D for the ship 1 of the fourth embodiment, gas at a pressure higher than the pressure inside the portable tank 40 is sent to the portable tank 40 via the pressurized line 70R, thereby enabling efficient supply of liquefied gas in a liquid state from the portable tank 40 to the fixed tank 20.

[0054] Furthermore, in the fourth embodiment, the pressurized line 70R sends the gaseous liquefied gas obtained by vaporizing the liquefied gas in the fixed tank 20 to the portable tank 40, thereby efficiently supplying the liquid liquefied gas from the portable tank 40 to the fixed tank 20. Furthermore, by using the fuel supply pump 28 to prepare gas at a pressure higher than the pressure in the portable tank 40, the need for a separate pump or the like to prepare high-pressure gas is reduced. Furthermore, the pressure difference between the portable tank 40 and the fixed tank 20 can be used to supply the liquid liquefied gas from the portable tank 40 to the fixed tank 20. Therefore, the need for a pump or the like to transfer the liquid liquefied gas from the portable tank 40 to the fixed tank 20 is reduced.

[0055] In the vessel 1 and the fuel supply system 10D for the vessel 1 of the fourth embodiment, as in the first to third embodiments, the vessel 1 can be efficiently loaded with liquefied gas, thereby shortening the berthing time of the vessel 1.

[0056] 13 is a diagram showing a connection state between a fixed tank and a portable tank in a modification of the fourth embodiment of the present disclosure. As shown in FIG. 13, a boat 1 and a fuel supply system 10E for the boat 1 in this modification of the fourth embodiment include a pressurized line 70R, a depressurized line 80R, and a pressure adjustment line 90S.

[0057] The pressure adjustment line 90S in this modified example is provided to communicate the gas phase in the portable tank 40 with the decompression line 80R. The pressure adjustment line 90S in this modified example is provided independently of the pressurization line 70R. An on-off valve 91S is provided in the pressure adjustment line 90S. By opening this on-off valve 91S, the gas phase in the fixed tank 20 and the gas phase in the portable tank 40 are communicated via the pressure adjustment line 90S, thereby equalizing the pressure in the fixed tank 20 and the portable tank 40. Furthermore, when the pressure in the portable tank 40 is higher than the pressure in the decompression line 80R, the liquefied gas in a gaseous state in the portable tank 40 can also be supplied to the fuel gas consuming appliance 8 through the pressure adjustment line 90S.

[0058] In this case, the pressure adjustment line 90S is provided independently of the pressurized line 70R, so even when the gas phase in the portable tank 40 is being pressurized by the pressurized line 70R, the pressure of the gas phase in another portable tank 40 can be adjusted through the pressure adjustment line 90S.

[0059] (Other Embodiments) 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. While the second to fourth embodiments and their modifications have been described above, these configurations can be combined as appropriate. Furthermore, the procedure for supplying liquefied gas from the portable tank 40 to the fixed tank 20 is not limited to the above-described procedure and can be modified as appropriate.

[0060] <Additional Notes> The boat 1 and the fuel supply systems 10A to 10E for the boat 1 described in each embodiment can be understood, for example, as follows.

[0061] (1) A ship 1 according to a first aspect comprises a hull 2, a fuel gas consuming device 8 provided on the hull 2, a fixed tank 20 fixed to the hull 2 ​​and capable of supplying liquefied gas to the fuel gas consuming device 8, and a tank mounting unit 30, 30P on which a portable tank 40 is detachably mounted, loaded from outside the hull 2, and capable of storing liquefied gas to be supplied only to the fixed tank 20 out of the fuel gas consuming device 8 and the fixed tank 20. Examples of the fuel gas consuming device 8 include an internal combustion engine and a boiler.

[0062] As a result, by carrying in a portable tank 40 containing liquefied gas from outside the ship and mounting it on the tank mounting section 30, 30P, the liquefied gas stored in the portable tank 40 mounted on the tank mounting section 30, 30P can be supplied to the fixed tank 20. To supply liquefied gas from the portable tank 40 to the fixed tank 20, the portable tank 40 and the fixed tank 20 must be connected, but this connection work can be performed on board. In addition, the supply of liquefied gas from the portable tank 40 to the fixed tank 20 can also be performed on board. Therefore, the connection work between the portable tank 40 and the fixed tank 20 and the supply of liquefied gas can be performed even after the ship 1 has departed. This prevents the ship 1 from being interrupted by the piping connection work or the liquefied gas supply work. As a result, liquefied gas can be loaded onto the ship 1 efficiently, and the ship 1's berthing time can be shortened.

[0063] (2) The vessel 1 according to the second aspect is the vessel 1 of (1), in which the fuel is liquefied gas, and further includes a liquefied gas supply line 50 that supplies the liquefied gas in liquid form from the portable tank 40 mounted on the tank mounting section 30, 30P to the fixed tank 20.

[0064] As a result, by connecting the portable tank 40 mounted on the tank mounting section 30, 30P to the fixed tank 20 with the liquefied gas supply line 50, it is possible to supply liquefied gas in a liquid state from the portable tank 40 to the fixed tank 20. Therefore, the work of connecting the portable tank 40 and the fixed tank 20 can be carried out efficiently.

[0065] (3) The ship 1 according to the third aspect is the ship 1 of (2), wherein the liquefied gas supply line 50 is configured to be able to connect the portable tank 40 mounted on each of the plurality of tank mounting sections 30, 30P to the fixed tank 20, and further includes a connection switching section 60 that selectively connects the portable tank 40 mounted on any one of the plurality of tank mounting sections 30, 30P to the fixed tank 20.

[0066] As a result, by first connecting the portable tank 40 mounted on one tank mounting section 30, 30P to the fixed tank 20 using the connection switching section 60, among the multiple portable tanks 40 mounted on the multiple tank mounting sections 30, 30P, liquefied gas in liquid state can be supplied from the portable tank 40 mounted on one tank mounting section 30, 30P to the fixed tank 20. Thereafter, by connecting the portable tank 40 mounted on another tank mounting section 30, 30P to the fixed tank 20 using the connection switching section 60, liquefied gas in liquid state can be supplied from the portable tank 40 mounted on the other tank mounting section 30, 30P to the fixed tank 20. In this way, liquefied gas in liquid state can be sequentially supplied to the fixed tank 20 from the multiple portable tanks 40 mounted on the multiple tank mounting sections 30, 30P.

[0067] (4) The ship 1 according to the fourth aspect is the ship 1 of (2) or (3), in which the tank mounting section 30P mounts the portable tank 40 at a position higher in the vertical direction Dv than the fixed tank 20.

[0068] This allows the liquefied gas in a liquid state to be efficiently supplied from the portable tank 40 to the fixed tank 20 by utilizing gravity.

[0069] (5) The ship 1 according to the fifth aspect is the ship 1 according to (2) or (3), further comprising pressurized lines 70Q, 70R for supplying gas at a pressure higher than the pressure inside the portable tank 40 to the portable tank 40 mounted on the tank mounting section 30, 30P.

[0070] This allows the liquefied gas in a liquid state to be efficiently supplied from the portable tank 40 to the fixed tank 20.

[0071] (6) The sixth aspect of the ship 1 is the ship 1 of (5), in which the pressurized lines 70Q, 70R send the liquefied gas in gaseous form in the fixed tank 20 to the portable tank 40 mounted on the tank mounting section 30, 30P.

[0072] This allows for efficient supply of liquefied gas in a liquid state from the portable tank 40 to the fixed tank 20. Furthermore, by using the liquefied gas in a gas state in the fixed tank 20 as gas with a higher pressure than the pressure in the portable tank 40, the need for a separate pump or the like to prepare high-pressure gas is reduced.

[0073] (7) The ship 1 according to the seventh aspect is the ship 1 of (5), further comprising a gas vaporization unit 27 that vaporizes the liquefied gas in the fixed tank 20 and supplies it to the fuel gas consumption equipment 8, and the pressurized line 70Q sends at least a portion of the liquefied gas in gaseous state vaporized in the gas vaporization unit 27 to the portable tank 40.

[0074] This allows for efficient supply of liquefied gas in a liquid state from the portable tank 40 to the fixed tank 20. Furthermore, by using the liquefied gas in a gaseous state vaporized by the gas vaporizer 27 as gas with a higher pressure than the pressure inside the portable tank 40, the need for a separate pump or the like to prepare high-pressure gas is reduced.

[0075] (8) The fuel supply system 10A to 10E for a ship 1 according to the eighth aspect includes any one of the ships 1 described in (1) to (7) and a portable tank 40 that can be mounted on the tank mounting section 30, 30P.

[0076] This allows the connection work between the portable tank 40 and the fixed tank 20 and the supply work of liquefied gas to be carried out even after the ship 1 has departed. Therefore, the departure of the ship 1 is prevented from being hindered due to the work of connecting the pipes or the work of supplying liquefied gas. As a result, the loading of liquefied gas onto the ship 1 can be carried out efficiently, and the berthing time of the ship 1 can be shortened.

[0077] (9) The fuel supply systems 10A to 10E for a ship 1 according to the ninth aspect are the fuel supply system 10 for a ship 1 of (8), in which the portable tank 40 comprises a tank body 41 capable of storing the liquefied gas, and a container frame 42 that supports the tank body 41, can be secured to the tank mounting section 30, 30P, and can be lifted by a lifting device.

[0078] As a result, by lifting the container frame 42 of the portable tank 40 with a lifting device, the portable tank 40 can be loaded onto or unloaded from the ship 1. Furthermore, by fastening the container frame 42 of the portable tank 40 to the tank mounting sections 30, 30P, the portable tank 40 can be detachably mounted on the tank mounting sections 30, 30P. Such a container frame 42 can have the same structure as a so-called container, and can be easily realized at low cost.

[0079] According to the ship and fuel supply system for the ship disclosed herein, fuel can be loaded onto the ship efficiently, and the ship's berthing time can be shortened.

[0080] REFERENCE SIGNS LIST 1 Ship 2 Hull 2a Bow 2b Stern 3A, 3B Side 4 Ship bottom 5 Upper deck 7 Superstructure 8 Fuel gas consuming equipment 10A to 10E Fuel supply system 20 Fixed tank 25, 25R Fuel supply piping system 27 Gas vaporization section 28 Pump 29 Evaporator 30, 30A to 30D, 30P Tank mounting section 30f Tank support surface 40 Portable tank 41 Tank body 42 Container frame 42a Lower frame 42b Support 42c Upper frame 43 Locking section 44 Support base 50, 50P, 50R Liquefied gas supply line 51, 51A to 51D Branch pipe 52P Gas return line 60 Connection switching section 61, 61A to 61D, 61P, 62P On-off valve 70Q, 70R Pressurized line 71R On-off valve 80Q, 80R Depressurized line 90R, 90S Pressure adjustment line 91R, 91S On-off valve 100 Binding member W Wire cable

Claims

1. A ship comprising: a hull; a fuel gas consuming equipment provided on the hull; a fixed tank fixed to the hull and capable of supplying fuel to the fuel gas consuming equipment; and a tank mounting section for detachably mounting a portable tank which is loaded from outside the hull and capable of storing fuel to be supplied only to the fixed tank among the fuel gas consuming equipment and the fixed tank.

2. The ship according to claim 1, wherein the fuel is liquefied gas, and further comprising a liquefied gas supply line for supplying the liquefied gas in a liquid state from the portable tank mounted on the tank mounting section to the fixed tank.

3. The ship as described in claim 2, further comprising a connection switching unit that selectively connects the portable tank and the fixed tank mounted on any one of the plurality of tank mounting units, and further comprising a plurality of tank mounting units, the tank mounting unit being provided with a plurality of tank mounting units and a connection switching unit that selectively connects the portable tank and the fixed tank mounted on any one of the plurality of tank mounting units.

4. The ship according to claim 2 or 3, wherein the tank mounting section mounts the portable tank at a vertically higher position than the fixed tank.

5. The ship according to claim 2 or 3, further comprising a pressurized line for supplying gas at a pressure higher than the pressure inside the portable tank to the portable tank mounted on the tank mounting section.

6. The ship according to claim 5, wherein the pressurized line sends the liquefied gas in a gaseous state in the fixed tank to the portable tank mounted on the tank mounting section.

7. The ship described in claim 5, further comprising a gas vaporization unit which vaporizes the liquefied gas in the fixed tank and supplies it to the fuel gas consuming equipment, and the pressurized line sends at least a portion of the liquefied gas in gaseous state vaporized in the gas vaporization unit to the portable tank.

8. A fuel supply system for a ship, comprising: the ship according to claim 1; and a portable tank that can be mounted on the tank mounting section.

9. A fuel supply system for a ship as described in claim 8, wherein the portable tank comprises: a tank body capable of storing the fuel; and a container frame that supports the tank body, can be secured to the tank mounting section, and can be lifted by a lifting device.

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