Ship and method for operating ship

Abstract

This ship comprises: a hull having a pair of broadsides and an upper deck; a plurality of ballast tanks provided within the hull along each of the pair of broadsides; a hold provided within the hull between the plurality of ballast tanks in a ship width direction, the hold being capable of accommodating bulk cargo; and a tank provided above the ballast tanks within the hull, the tank being capable of storing liquefied carbon dioxide.

Description

Ships and ship operation methods

[0001] This application claims priority to Japanese Patent Application No. 2023-143216, filed on September 4, 2023, the contents of which are incorporated herein by reference.

[0002] Patent Document 1 discloses that ore is transported over long distances by an ore carrier. The ore carrier disclosed in Patent Document 1 is equipped with a hold for storing ore and a hatch for loading and unloading the ore from the hold.

[0003] JP 2011-122179 A

[0004] The vessel described in Patent Document 1, for example, loads ore into a hold through a hatch while anchored at a port in an ore-producing region, then sails to its destination and unloads the ore stored in the hold. However, after unloading at the destination, the hold becomes empty when the vessel heads to its port of departure or another destination. Similarly, even in a vessel equipped with a hold capable of accommodating bulk cargo such as coal, cement, or grain, the hold may become empty when the vessel unloads the bulk cargo at its port of departure and then heads to its port of departure or another destination. When the hold is empty, the vessel's displacement decreases and the vessel's draft becomes shallow. Therefore, in order to fully submerge the propellers that propel the vessel, it is necessary to deepen the vessel's draft by loading ballast water into the ballast tanks. Navigating an empty hold thus consumes fuel, leading to reduced vessel operational efficiency.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a ship and a ship operation method that can improve the operation efficiency of the ship.

[0006] In order to solve the above problems, a ship according to the present disclosure includes a hull, a plurality of ballast tanks, a hold, and a tank. The hull has a pair of side walls and an upper deck. The ballast tanks are provided within the hull along each of the pair of side walls. The hold is provided within the hull between the plurality of ballast tanks in the ship's width direction. The hold is capable of accommodating bulk cargo. The tank is provided within the hull above the ballast tanks. The tank is capable of storing liquefied carbon dioxide.

[0007] A method for operating a ship according to the present disclosure is a method for operating a ship as described above. The method for operating a ship includes the steps of: sailing to a bulk cargo utilization facility as a destination; unloading the bulk cargo; storing liquefied carbon dioxide; and sailing toward another destination different from the destination. In the step of sailing to a bulk cargo utilization facility as a destination, the bulk cargo is stored in the hold and the ballast tanks are emptied, and the ship sails toward the bulk cargo utilization facility as a destination. In the step of unloading the bulk cargo, the bulk cargo is unloaded from the hold at the destination. In the step of storing liquefied carbon dioxide, ballast water is stored in the ballast tanks and liquefied carbon dioxide is stored in the tanks. In the step of sailing toward a destination different from the destination, the hold is emptied, ballast water is stored in the ballast tanks, and liquefied carbon dioxide is stored in the tanks, and the ship sails toward the other destination different from the destination.

[0008] According to the ship and ship operation method disclosed herein, the operation efficiency of the ship can be improved.

[0009] Fig. 1 is a side view of a ship according to an embodiment of the present disclosure. Fig. 2 is a plan view of a ship according to an embodiment of the present disclosure. Fig. 3 is a cross-sectional view of a ship according to an embodiment of the present disclosure as viewed from the bow and stern. Fig. 4 is a flowchart showing the steps of a method for operating a ship according to an embodiment of the present disclosure. Fig. 5 is a cross-sectional view showing a state in which bulk cargo is stored in a hold in a method for operating a ship according to an embodiment of the present disclosure. Fig. 6 is a cross-sectional view showing a state in which liquefied carbon dioxide is stored in a tank and ballast water is stored in a ballast tank in a method for operating a ship according to an embodiment of the present disclosure.

[0010] A ship and a method for operating the ship according to an embodiment of the present disclosure will be described below with reference to Figures 1 to 6. (Overall configuration of the ship) As shown in Figures 1 to 3, the ship 1 of this embodiment includes at least a hull 2, a hold 10, ballast tanks 20A and 20B, and a tank 30.

[0011] (Hull Structure) The hull 2 ​​has a pair of side walls 3A, 3B that form its outer shell, a bottom 4, and an upper deck 5. The side walls 3A, 3B have a pair of side shell plates that form the port and starboard sides, respectively. The bottom 4 has a bottom shell plate that connects the side walls 3A, 3B. The upper deck 5 is a full-length deck that is exposed to the outside. As shown in Figures 1 and 2, the hull 2 ​​has a superstructure 6 with accommodation areas formed on the upper deck 5, for example, on the stern 2b side.

[0012] (Configuration of the Hold) In the hull 2 ​​illustrated in this embodiment, the hold 10 is provided closer to the bow 2a than the superstructure 6. As shown in Figures 2 and 3, the hold 10 is formed within the hull 2, between ballast tanks 20A and 20B (described later). The hold 10 is formed between a pair of side walls 7A and 7B spaced apart in the ship's transverse direction Dw. The pair of side walls 7A and 7B are spaced apart in the ship's transverse direction Dw. The side wall 7A on one side in the ship's transverse direction Dw is spaced inward in the ship's transverse direction Dw from the ship's side 3A on one side in the ship's transverse direction Dw. The side wall 7B on the other side in the ship's transverse direction Dw is spaced inward in the ship's transverse direction Dw from the ship's side 3B on the other side in the ship's transverse direction Dw. Each of the pair of side walls 7A and 7B extends in the fore-and-aft direction FA. The location of the hold 10 is not limited to the bow 2a side of the superstructure 6.

[0013] As shown in Figures 1 and 2, a plurality of partition walls 8 are provided between the pair of ship sides 3A, 3B at intervals in the fore-and-aft direction FA. Each partition wall 8 is a so-called transverse bulkhead that extends in the ship's breadth direction Dw in a plan view (in other words, when viewed from the up-and-down direction Dv). When viewed from the fore-and-aft direction FA, each partition wall 8 closes the space between the pair of ship sides 3A, 3B between the ship bottom 4 and the upper deck 5. The hold 10 illustrated in this embodiment is partitioned by these multiple partition walls 8 into a total of five hold compartments 10A to 10E lined up in the fore-and-aft direction FA. Note that, although the example shows a case in which the hold 10 is partitioned into a total of five hold compartments 10A to 10E, the number of hold compartments can be changed as appropriate.

[0014] The hold 10 formed between the pair of side walls 7A, 7B is covered from above by the upper deck 5. Hatches 12 are formed on the upper deck 5, which communicate with each of the hold compartments 10A to 10E of the hold 10. The hatches 12 penetrate the upper deck 5 from top to bottom. Each hatch 12 is provided with a hatch cover 13 that can be opened and closed by sliding, for example, in the ship's width direction Dw.

[0015] Each of the hold compartments 10A to 10E of the hold 10 is capable of storing bulk cargo. Examples of bulk cargo that can be stored in the hold compartments 10A to 10E include various types of ores such as iron ore, coal, cement, and grain. A plurality of different types of bulk cargo may be stored in the plurality of hold compartments 10A to 10E. In this embodiment, iron ore can be stored in the plurality of hold compartments 10A to 10E.

[0016] (Configuration of ballast tanks) Ballast tanks 20A, 20B are provided inside the hull 2 ​​along each of a pair of ship sides 3A, 3B. Multiple ballast tanks 20A, 20B are provided lined up in the fore-aft direction FA. Specifically, ballast tank 20A is provided along ship side 3A, with multiple ballast tanks 20A lined up in the fore-aft direction FA. Ballast tank 20B is provided along ship side 3B, with multiple ballast tanks 20B lined up in the fore-aft direction FA.

[0017] As shown in Figure 3, the ballast tank 20A on one side in the ship's width direction Dw is provided between the ship's side 3A on one side in the ship's width direction Dw and the sidewall 7A on one side in the ship's width direction Dw. A top plate 21A made of a watertight deck is provided above the ship's bottom 4 between the ship's side 3A on one side in the ship's width direction Dw and the sidewall 7A on one side in the ship's width direction Dw. The top plate 21A extends in the ship's width direction Dw when viewed from the fore-aft direction FA. When viewed from the up-down direction Dv, the top plate 21A blocks the space between the ship's side 3A on one side in the ship's width direction Dw and the sidewall 7A on one side in the ship's width direction Dw.

[0018] In the hold compartments 10A to 10D, each ballast tank 20A is formed to be surrounded by adjacent compartment walls 8 in the fore-aft direction FA, the ship's side 3A, the side wall 7A, the ship's bottom 4, and the top plate 21A. Note that, as shown in Figure 1, the ballast tank 20A in the hold compartment 10E may be formed to be surrounded by adjacent compartment walls 8 in the fore-aft direction FA, the ship's side 3A, the side wall 7A, the ship's bottom 4, and the upper deck 5.

[0019] As shown in Figure 3, the ballast tank 20B on the other side in the ship's width direction Dw is provided between the ship's side 3B on the other side in the ship's width direction Dw and the sidewall 7B on the other side in the ship's width direction Dw. A top plate 21B made of a watertight deck is provided above the ship's bottom 4 between the ship's side 3B on the other side in the ship's width direction Dw and the sidewall 7B on the other side in the ship's width direction Dw. The top plate 21B extends in the ship's width direction Dw when viewed from the fore-aft direction FA. When viewed from the up-down direction Dv, the top plate 21B blocks the space between the ship's side 3B on the other side in the ship's width direction Dw and the sidewall 7B on the other side in the ship's width direction Dw.

[0020] In the hold compartments 10A to 10D, each ballast tank 20B is surrounded by adjacent compartment walls 8 in the fore-aft direction FA, the ship's side 3B, the side wall 7B, the ship's bottom 4, and the top plate 21B. As shown in Figure 1, in the hold compartment 10E, the ballast tank 20B is surrounded by adjacent compartment walls 8 in the fore-aft direction FA, the ship's side 3A, the side wall 7A, the ship's bottom 4, and the upper deck 5.

[0021] Each of the ballast tanks 20A, 20B is configured to allow seawater to be introduced into the tank from outside the ship and discharged out of the tank using a pump (not shown). The number of ballast tanks 20A, 20B arranged in the bow-stern direction FA can be changed as needed.

[0022] (Tank configuration) As shown in Figures 1 and 3, each tank 30 is provided below the upper deck 5. The tanks 30 are provided on both sides of the hold 10 in the ship's width direction Dw. The tanks 30 include a tank 30A provided on one side in the ship's width direction Dw and a tank 30B provided on the other side in the ship's width direction Dw.

[0023] 3, the tank 30A provided on one side in the ship's width direction Dw is provided above the ballast tank 20A within the hull 2. The tank 30A provided on one side in the ship's width direction Dw is provided vertically above the ballast tank 20A when viewed from the fore-and-aft direction FA of the hull 2.

[0024] The tank 30A is accommodated in a space SA surrounded by the top plate 21A of the ballast tank 20A, the outer side 3A of the top plate 21A in the ship's width direction Dw, the inner side wall 7A of the top plate 21A in the ship's width direction Dw, and the upper deck 5. The tank 30A is provided on the top plate 21A via support legs 31.

[0025] The tank 30B provided on the other side in the ship's width direction Dw is provided above the ballast tank 20B within the hull 2. The tank 30B provided on the other side in the ship's width direction Dw is provided vertically above the ballast tank 20B when viewed from the fore-and-aft direction FA of the hull 2.

[0026] The tank 30B is accommodated in a space SB surrounded by the top plate 21B of the ballast tank 20B, the outer side 3B of the top plate 21B in the ship's width direction Dw, the inner side wall 7B of the top plate 21B in the ship's width direction Dw, and the upper deck 5. The tank 30B is provided on the top plate 21B via support legs 31.

[0027] As shown in Figure 2, the tanks 30A, 30B are arranged in multiple rows in the fore-and-stern direction FA. In this embodiment, the tanks 30A, 30B are each arranged between adjacent compartment walls 8 in the fore-and-stern direction FA. As a result, as shown in Figure 1, each of the tanks 30A, 30B is arranged within a range A in the fore-and-stern direction FA in which at least one of the multiple ballast tanks 20A, 20B is arranged. Here, in this embodiment, the tanks 30A, 30B are arranged within a range in the fore-and-stern direction FA in which the multiple ballast tanks 20A, 20B are arranged on both sides of the hold compartments 10A-10D in the ship's width direction Dw. However, the tanks 30A, 30B do not necessarily have to be arranged in correspondence with all of the multiple ballast tanks 20A, 20B.

[0028] Each of the tanks 30 (tanks 30A, 30B) is capable of storing liquefied carbon dioxide. The tanks 30 are, for example, cylindrical and extend horizontally. In the embodiment of the present disclosure, each tank 30 is provided so as to extend in the bow-stern direction FA. Note that the tanks 30 are not limited to being cylindrical, and the tanks 30 may be bi-lobe, spherical, rectangular, or the like. Furthermore, the tanks 30 may be provided so as to extend in the up-down direction Dv.

[0029] Each tank 30 may be provided with a thermal insulator (not shown) to suppress heat input from the outside to the liquefied carbon dioxide in the tank 30. Each tank 30 may also be provided with various devices for managing the state of the liquefied carbon dioxide L in the tank 30. As shown in FIG. 3 , a tank dome 33 is provided on the top of each tank 30 for loading liquefied carbon dioxide into the tank 30, discharging liquefied carbon dioxide from the tank 30, detecting the pressure inside the tank 30, and the like. The tank dome 33 extends upward in the vertical direction Dv from the tank 30, penetrates the upper deck 5, and protrudes above the upper deck 5. The tank dome 33 is provided so as not to interfere with the hatch cover 13 when the hatch cover 13 is opened. This allows the piping for loading liquefied carbon dioxide into the tank 30 and the piping for discharging liquefied carbon dioxide from the tank 30 to be connected above the upper deck 5, facilitating piping installation.

[0030] (Procedure of ship operation method) Figure 4 is a flowchart showing procedures of a ship operation method according to an embodiment of the present disclosure. As shown in Figure 4, a ship operation method S10 according to this embodiment includes a step S11 of loading bulk cargo, a step S12 of sailing to a bulk cargo utilization facility as a destination, a step S13 of unloading the bulk cargo, a step S14 of storing liquefied carbon dioxide, a step S15 of sailing to another destination different from the destination, and a step S16 of unloading the liquefied carbon dioxide.

[0031] Figure 5 is a cross-sectional view showing a state in which bulk cargo has been stored in a hold in a method of operating a ship according to an embodiment of the present disclosure. In step S11 of loading bulk cargo, as shown in Figure 5, bulk cargo B is loaded into hold 10 inside hull 2. In this embodiment, iron ore is loaded into hold 10 as bulk cargo B. With ship 1 anchored at a port in an ore-producing area, hatch cover 13 is opened and iron ore as bulk cargo B is loaded into hold 10 through hatch 12. After loading of bulk cargo B is completed, hatch cover 13 is closed. Ballast tanks 20A, 20B and tank 30 are empty.

[0032] In step S12 of sailing to a facility for utilizing bulk cargo, the ship 1 is sailed from the port of the ore producing area where the bulk cargo B was loaded into the hold 10 in step S11 as a departure point, to a facility for utilizing the bulk cargo B as a destination. At this time, the ship 1 is sailed to the destination with the bulk cargo B stored in the hold 10 and the ballast tanks 20A, 20B and the tank 30 empty.

[0033] The utilization facility for the bulk cargo B is a facility that performs predetermined processing using iron ore as the bulk cargo B transported by the ship 1. In this embodiment, the utilization facility for the bulk cargo B is a steelworks that uses iron ore as the bulk cargo B as a raw material to produce steel.

[0034] When the ship 1 arrives at the destination, step S13 is executed. In step S13 of unloading the bulk cargo B, the hatch cover 13 is opened at the destination, and the bulk cargo B is unloaded from the hold 10.

[0035] FIG. 6 is a cross-sectional view showing a state in which liquefied carbon dioxide is stored in the tanks and ballast water is stored in the ballast tanks in a method for operating a ship according to an embodiment of the present disclosure. After completion of step S13, step S14 is carried out to store liquefied carbon dioxide L. In step S14 of this embodiment, as shown in FIG. 6, ballast water W is stored in ballast tanks 20A and 20B, and liquefied carbon dioxide L is stored in tank 30. In this embodiment, in step S14, liquefied carbon dioxide L obtained by liquefying carbon dioxide generated during steelmaking using iron ore at a steelworks that is a facility using bulk cargo B is stored in tank 30. The amount of ballast water W stored in ballast tanks 20A and 20B is adjusted according to the amount of liquefied carbon dioxide L loaded and stored in tank 30 so as to maintain the stability and stability of ship 1.

[0036] Here, step S14 of storing the liquefied carbon dioxide L may be performed at a port different from the port where step S13 of unloading the bulk cargo B was performed. In this case, the ship 1 is navigated from the port where step S13 of unloading the bulk cargo B was performed to another port where the liquefied carbon dioxide L is stored, and the liquefied carbon dioxide L is loaded into the tank 30 at the other port. In this case, by storing a predetermined amount of ballast water W in the ballast tanks 20A, 20B at the port where step S13 of unloading the bulk cargo B was performed, the stability and stability of the ship 1 are ensured during the navigation to the other port where step S14 is performed. Note that, although the case where ballast water W is stored in the ballast tanks 20A, 20B in step S14 has been described, storing ballast water W in the ballast tanks 20A, 20B may be omitted if necessary.

[0037] In step S15 of sailing toward another destination different from the destination, the hold 10 is emptied in step S13, and in step S14, the ship 1 is sailed toward the other destination different from the destination with ballast water W stored in the ballast tanks 20A and 20B and liquefied carbon dioxide L stored in the tank 30. Examples of the other destination include the departure point where the bulk cargo B was loaded in step S11, another port where a carbon dioxide utilization facility is installed to recover the liquefied carbon dioxide L stored in the tank 30, etc.

[0038] When the vessel 1 arrives at the other destination, step S16 of unloading the liquefied carbon dioxide is carried out. In step S16 of unloading the liquefied carbon dioxide, the liquefied carbon dioxide in the tank 30 is discharged from the tank 30 and stored in a storage facility or the like provided at the other destination that is capable of storing liquefied carbon dioxide. Thereafter, in method S10 of operating the vessel 1, steps S11 to S16 as described above are sequentially repeated.

[0039] (Operation and Effect) The ship 1 of the above embodiment is equipped with ballast tanks 20A, 20B, a hold 10 capable of accommodating bulk cargo B, and a tank 30 capable of storing liquefied carbon dioxide L. As a result, when the ship 1 transports bulk cargo B to a destination, the ship 1 stores the bulk cargo B in the hold 10 and leaves the ballast tanks 20A, 20B empty while sailing to the destination. After unloading the bulk cargo B at the destination, the ship 1 stores ballast water W in the ballast tanks 20A, 20B and stores liquefied carbon dioxide L in the tank 30, and sails to another destination. This prevents the ship 1 from sailing empty. As a result, the operation efficiency of the ship 1 can be improved.

[0040] Furthermore, in the above embodiment, by providing the tank 30 below the upper deck 5, the center of gravity of the hull 2 ​​can be lowered compared to when the tank 30 is provided above the upper deck 5, thereby achieving greater stability. Furthermore, when the hold 10 is empty, the liquefied carbon dioxide L stored in the tank 30 can function as ballast. This ensures the stability and stability of the ship 1. Furthermore, the ballast water W stored in the ballast tanks 20A, 20B can be reduced by the weight of the liquefied carbon dioxide L stored in the tank 30 and the weight of the tank 30 itself.

[0041] Furthermore, in the above embodiment, by providing the tanks 30 (30A, 30B) on both sides of the hold 10 in the ship's width direction Dw, the weight of the liquefied carbon dioxide L stored in the tanks 30 can be made to function as ballast in a well-balanced manner in the ship's width direction Dw. Also, the tanks 30 can be arranged without narrowing the cargo loading space in the hold 10.

[0042] In addition, in the above embodiment, by locating the tank 30 vertically above the ballast tanks 20A, 20B in the up-down direction Dv when viewed from the bow-stern direction FA, it becomes easier to install piping for loading liquefied carbon dioxide into the tank 30 and piping for discharging liquefied carbon dioxide from the tank 30.

[0043] Furthermore, in the above embodiment, the tank 30 is arranged within a range A in the bow-stern direction FA in which the ballast tanks 20A, 20B are arranged, relative to at least one of the multiple ballast tanks 20A, 20B arranged in a row in the bow-stern direction FA, so that the liquefied carbon dioxide L stored in the tank 30 can effectively function as ballast.

[0044] In the above embodiment, the tanks 30 (30A, 30B) are housed in spaces SA, SB surrounded by the top plates 21A, 21B of the ballast tanks 20A, 20B, the outer side walls 3A, 3B of the top plates 21A, 21B in the ship's width direction Dw, the inner side walls 7A, 7B of the top plates 21A, 21B in the ship's width direction Dw, and the upper deck 5. This makes it easier to ensure thermal insulation in the tanks 30.

[0045] Furthermore, in the operation method S10 of the ship 1 of the above embodiment, bulk cargo B is stored in the hold 10, and the ship 1 sails to a facility at a destination that uses the bulk cargo B. After unloading the bulk cargo B from the hold 10 at the destination, ballast water W is stored in the ballast tanks 20A and 20B, and liquefied carbon dioxide L is stored in the tank 30, and the ship 1 sails to another destination. This prevents the ship 1 from sailing empty. As a result, the operation efficiency of the ship 1 can be improved.

[0046] Furthermore, in the above embodiment, after the bulk cargo B is unloaded from the hold 10 at the utilization facility of the destination bulk cargo B, the carbon dioxide generated at the utilization facility is liquefied and the liquefied carbon dioxide L is stored in the tank 30. This improves the operating efficiency of the ship 1 and enables efficient recovery of carbon dioxide at the utilization facility.

[0047] Furthermore, in the above embodiment, the ship 1 transports iron ore to be used at the steel mill and captures the carbon dioxide generated when the iron ore is used to make steel at the steel mill, thereby improving the operating efficiency of the ship 1 and also making the steel mill more efficient.

[0048] Other Embodiments While the embodiments of the present disclosure have been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design modifications and the like are also included within the scope of the present disclosure. In the above embodiment, each tank 30 is arranged within the range A in the bow-stern direction FA in which the ballast tanks 20A and 20B are arranged, but this is not limited thereto. For example, the tank 30 may be arranged at a position offset in the bow-stern direction FA relative to each of the multiple ballast tanks 20A and 20B. For example, the tank 30 may be arranged so as to straddle multiple ballast tanks 20A and 20B adjacent to each other in the bow-stern direction FA. Furthermore, in the above embodiment, the tanks 30 are arranged on both sides of each of the hold compartments 10A to 10E in the ship's width direction Dw, but this is not limited thereto. The tanks 30 may be arranged on both sides of the hold 10 in the width direction of the ship. For example, in the width direction Dw of the hold section 10A, the tanks 30 may be arranged only on the starboard side, and in the width direction Dw of the hold section 10B, the tanks 30 may be arranged only on the port side. In other words, the tanks 30 arranged on the port side and the tanks 30 arranged on the starboard side may be arranged alternately (in other words, staggered) in the bow-stern direction FA.

[0049] <Additional Notes> The vessel 1 and the operation method S10 for the vessel 1 described in the embodiment can be understood, for example, as follows.

[0050] (1) A ship 1 according to a first aspect comprises a hull 2 ​​having a pair of side walls 3A, 3B and an upper deck 5, a plurality of ballast tanks 20A, 20B provided within the hull 2 ​​along each of the pair of side walls 3A, 3B, a hold 10 provided within the hull between the ballast tanks 20A, 20B in the ship's width direction and capable of accommodating bulk cargo B, and a tank 30 provided within the hull 2 ​​above the ballast tanks 20A, 20B and capable of storing liquefied carbon dioxide L.

[0051] As a result, when transporting bulk cargo B to a destination, the bulk cargo B is stored in the hold 10 and the ballast tanks 20A, 20B are left empty while the ship sails to the destination, and after unloading the bulk cargo B at the destination, ballast water W is stored in the ballast tanks 20A, 20B and liquefied carbon dioxide L is stored in the tank 30, and the ship can sail to another destination. This prevents the ship 1 from sailing empty. As a result, the operating efficiency of the ship 1 can be improved.

[0052] (2) The ship 1 according to the second aspect is the ship 1 of (1), in which the tank 30 is provided below the upper deck 5.

[0053] This allows the center of gravity of the hull 2 ​​to be lowered, making it more stable, compared to when the tank 30 is provided above the upper deck 5. Furthermore, when the hold 10 is empty, the liquefied carbon dioxide L stored in the tank 30 can function as ballast. This allows the ballast water W stored in the ballast tanks 20A, 20B to be reduced by the weight of the liquefied carbon dioxide L stored in the tank 30 and the weight of the tank 30 itself.

[0054] (3) The ship 1 according to the third aspect is the ship 1 of (1) or (2), in which the tanks 30 are provided on both sides of the hold 10 in the ship's width direction Dw.

[0055] This allows the weight of the liquefied carbon dioxide L stored in the tank 30 to function as ballast in a well-balanced manner. Also, the tank 30 can be arranged without narrowing the cargo loading space in the hold 10.

[0056] (4) The ship 1 according to the fourth aspect is any one of the ships 1 of (1) to (3), in which the tank 30 is provided vertically above the ballast tanks 20A, 20B when viewed from the bow-stern direction FA of the hull 2.

[0057] This makes it easier to install the piping for loading liquefied carbon dioxide into the tank 30 and the piping for discharging liquefied carbon dioxide from the tank 30.

[0058] (5) The ship 1 according to the fifth aspect is the ship 1 of (4), wherein the ballast tanks 20A, 20B are arranged in a row in the bow-stern direction FA of the hull 2, and the tank 30 is arranged within a range A in the bow-stern direction FA in which the ballast tanks 20A, 20B are arranged, relative to at least one of the ballast tanks 20A, 20B.

[0059] This allows the liquefied carbon dioxide L stored in the tank 30 to function effectively as ballast.

[0060] (6) The ship 1 according to the sixth aspect is any one of the ships 1 of (1) to (5), wherein the hold 10 is formed between a pair of side walls 7A, 7B provided on both sides of the hull 2 ​​in the ship's width direction Dw, and the tank 30 is accommodated in a space SA, SB surrounded by the top plates 21A, 21B of the ballast tanks 20A, 20B, the side walls 3A, 3B on the outer side of the top plates 21A, 21B in the ship's width direction Dw, the side walls 7A, 7B on the inner side of the top plates 21A, 21B in the ship's width direction Dw, and the upper deck 5.

[0061] This makes it easier to ensure thermal insulation in the tank 30 that stores the liquefied carbon dioxide.

[0062] (7) The seventh aspect of the operation method S10 of the ship 1 is an operation method S10 of any one of the ships 1 of (1) to (6), and includes a step S12 of storing the bulk cargo B in the hold 10 and leaving the ballast tanks 20A, 20B empty, and sailing to a facility for using the bulk cargo B as a destination, a step S13 of unloading the bulk cargo B from the hold 10 at the destination, a step S14 of storing liquefied carbon dioxide L in the tank 30, and a step S15 of sailing to a destination other than the destination with the hold 10 empty and liquefied carbon dioxide L stored in the tank 30.

[0063] This prevents the ship 1 from sailing with an empty load, thereby improving the operation efficiency of the ship 1.

[0064] (8) The eighth aspect of the method S10 for operating a ship 1 is the method S10 for operating a ship 1 of (7), and in the step S14 for storing the liquefied carbon dioxide L, the liquefied carbon dioxide L, which is obtained by liquefying carbon dioxide generated at the utilization facility, is stored in the tank 30.

[0065] This increases the operating efficiency of the ship 1 and enables efficient recovery of carbon dioxide at utilization facilities.

[0066] (9) A ninth aspect of the method S10 for operating a ship 1 is the method S10 for operating a ship 1 of (7) or (8), in which the bulk cargo B is iron ore and the utilization facility is a steel mill.

[0067] This allows the ship 1, which transports iron ore to be used at the steelworks, to capture carbon dioxide generated when the iron ore is used to make steel at the steelworks, thereby improving the operating efficiency of the ship 1 and also improving the efficiency of the operation of the steelworks.

[0068] According to the ship and ship operation method disclosed herein, the operation efficiency of the ship can be improved.

[0069] REFERENCE SIGNS LIST 1...ship 2...hull 2a...bow 2b...stern 3A, 3B...side 4...bottom 5...upper deck 6...superstructure 7A, 7B...side wall 8...compartment wall 10...hold 10A to 10E...hold compartment 12...hatch 13...hatch cover 20A, 20B...ballast tank 21A, 21B...top plate 30, 30A, 30B...tank 31...support leg 33...tank dome A...area B...cargo L...liquefied carbon dioxide SA, SB...space

Claims

1. A ship comprising: a hull having a pair of shipboard sides and an upper deck; a plurality of ballast tanks provided within the hull along each of the pair of shipboard sides; a hold provided within the hull between the plurality of ballast tanks in the ship's width direction and capable of accommodating bulk cargo; and a tank provided within the hull above the ballast tanks and capable of storing liquefied carbon dioxide.

2. The ship according to claim 1, wherein the tank is provided below the upper deck.

3. A ship as claimed in claim 1 or 2, wherein the tanks are provided on both sides of the hold in the ship's width direction.

4. A ship as claimed in claim 1 or 2, wherein the tank is provided vertically above the ballast tank when viewed from the bow and stern of the hull.

5. A ship as described in claim 4, wherein the ballast tanks are arranged in a row in the bow-stern direction of the hull, and the tank is arranged within a bow-stern range of at least one of the ballast tanks.

6. A ship as described in claim 1 or 2, wherein the hold is formed between a pair of side walls provided on both sides of the hull in the ship's width direction, and the tank is contained in a space surrounded by the top plate of the ballast tank, the ship's side on the outer side of the top plate in the ship's width direction, the side wall on the inner side of the top plate in the ship's width direction, and the upper deck.

7. A method of operating a ship as described in claim 1, comprising the steps of: storing the bulk cargo in the hold and emptying the ballast tanks, and sailing to a facility for using the bulk cargo as a destination; unloading the bulk cargo from the hold at the destination; storing liquefied carbon dioxide in the tanks; and sailing to a destination different from the destination with the hold empty and the liquefied carbon dioxide stored in the tanks.

8. A method for operating a ship as described in claim 7, wherein in the step of storing liquefied carbon dioxide, carbon dioxide generated at the utilization facility is liquefied and stored in the tank.

9. The method of operating a ship according to claim 7 or 8, wherein the bulk cargo is iron ore, and the utilization facility is a steelworks.

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