Ship and ship navigation method

Abstract

To improve ship navigation efficiency.SOLUTION: A ship comprises a hull with a pair of sideboards and an upper deck, multiple ballast tanks provided in the hull along each of the pair of the sideboards, a hold provided in the hull between the multiple ballast tanks in the ship width direction and capable of accommodating bulk cargo, and a tank provided in the hull above the ballast tank and capable of storing liquefied carbon dioxide.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a ship and a method for operating a ship. [Background technology]

[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. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-122179 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, in the ship described in Patent Document 1, for example, ore is loaded into a hold through a hatch while anchored at a port in an ore-producing area, and then the ship sails to a destination and unloads the ore stored in the hold at the destination. On the other hand, after unloading at the destination, when the ship heads to the departure port or another destination, the hold becomes empty. Similarly, even in a ship equipped with a hold capable of accommodating bulk cargo such as coal, cement, grain, etc., the hold may be empty when the bulk cargo loaded at the port of departure is unloaded at the destination and the ship travels to the port of departure or another destination. When the hold is empty, the displacement is small and the draft is shallow, so that the draft must be deepened by loading ballast water into the ballast tanks in order to fully submerge the propellers that propel the ship. In this way, sailing through an empty hold involves fuel consumption, which leads to a decrease in the ship's 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. [Means for solving the problem]

[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 ship sides and an upper deck. The ballast tank is provided within the hull along each of the pair of ship sides. 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 tank. The tank is capable of storing liquefied carbon dioxide.

[0007] A method of operating a ship according to the present disclosure is a method of operating a ship as described above. The method of operating the ship includes a step of navigating a facility for utilizing bulk cargo as a destination, a step of unloading the bulk cargo, a step of storing liquefied carbon dioxide, and a step of navigating toward another destination different from the destination. In the step of navigating toward a facility for utilizing bulk cargo as a destination, the bulk cargo is stored in the hold, and the ballast tank is empty, and the ship navigates toward the facility for utilizing the bulk cargo 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 the liquefied carbon dioxide, ballast water is stored in the ballast tank, and liquefied carbon dioxide is stored in the tank. In the step of navigating toward a destination different from the destination, the ship navigates toward the other destination different from the destination, with the hold empty, ballast water is stored in the ballast tank, and liquefied carbon dioxide is stored in the tank. Effect of the Invention

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

[0009] [Figure 1] FIG. 1 is a side view of a marine vessel according to an embodiment of the present disclosure. [Diagram 2] FIG. 1 is a plan view of a marine vessel according to an embodiment of the present disclosure. [Diagram 3] 1 is a cross-sectional view of a marine vessel according to an embodiment of the present disclosure as viewed from the bow-stern direction. [Figure 4] 4 is a flowchart illustrating the steps of a marine vessel operation method according to an embodiment of the present disclosure. [Diagram 5] 1 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. [Figure 6] 1 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. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0011] (Hull configuration) The hull 2 ​​has a pair of side panels 3A, 3B that form its outer hull, a ship bottom 4, and an upper deck 5. The side panels 3A, 3B have a pair of side panel shells that form the port and starboard sides, respectively. The ship bottom 4 has a ship bottom panel shell that connects the side panels 3A, 3B. The upper deck 5 is a full deck that is exposed to the outside. As shown in Figures 1 and 2, the hull 2 ​​has a superstructure 6 with living quarters formed on the upper deck 5, for example, on the stern 2b side.

[0012] (Hold configuration) The hold 10 is provided on the bow 2a side of the superstructure 6 in the hull 2 ​​exemplified in this embodiment. As shown in Figs. 2 and 3, the hold 10 is formed in 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 transverse direction Dw. The pair of side walls 7A and 7B are spaced apart in the transverse direction Dw. The side wall 7A on one side in the transverse direction Dw is spaced apart from the ship's side 3A on one side in the transverse direction Dw, on the inside of the transverse direction Dw. The side wall 7B on the other side in the transverse direction Dw is spaced apart from the ship's side 3B on the other side in the transverse direction Dw, on the inside of the transverse direction Dw. Each of the pair of side walls 7A and 7B extends in the bow-stern direction FA. The location of the hold 10 is not limited to the bow 2a side of the superstructure 6.

[0013] As shown in Figs. 1 and 2, a plurality of partition walls 8 are provided between the pair of ship sides 3A, 3B at intervals in the bow-stern direction FA. Each partition wall 8 is a so-called transverse bulkhead that extends in the ship width direction Dw in a plan view (in other words, when viewed from the vertical direction Dv). 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 when viewed from the bow-stern direction FA. The hold 10 illustrated in this embodiment is partitioned into a total of five hold compartments 10A to 10E arranged in the bow-stern direction FA by the plurality of partition walls 8. Note that, although the case where the hold 10 is partitioned into a total of five hold compartments 10A to 10E has been illustrated, 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 communicating with each of the hold compartments 10A to 10E of the hold 10 are formed on the upper deck 5. 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] Bulk cargo can be stored in each of the hold compartments 10A-10E of the hold 10. Examples of bulk cargo that can be stored in the hold compartments 10A-10E include various types of ores such as iron ore, coal, cement, and grains. A plurality of different types of bulk cargo may be stored in the plurality of hold compartments 10A-10E. In this embodiment, iron ore can be stored in the plurality of hold compartments 10A-10E.

[0016] (Ballast tank configuration) Ballast tanks 20A, 20B are provided within the hull 2 ​​along each of a pair of ship sides 3A, 3B. Each of the ballast tanks 20A, 20B is provided in a row in the fore-aft direction FA. Specifically, ballast tank 20A is provided along ship side 3A, and a plurality of ballast tanks 20A are provided in a row in the fore-aft direction FA. Ballast tank 20B is provided along ship side 3B, and a plurality of ballast tanks 20B are provided in a row in the fore-aft direction FA.

[0017] As shown in Fig. 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 as viewed from the bow-stern direction FA. The top plate 21A closes the gap 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 as viewed from the up-down direction Dv.

[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 Fig. 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 Fig. 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 as viewed from the bow-stern direction FA. The top plate 21B closes the gap 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 as viewed from the up-down direction Dv.

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

[0021] In each of the ballast tanks 20A, 20B, a pump (not shown) is capable of introducing seawater into the tank from outside the ship and discharging seawater from inside the tank to outside the ship. The number of ballast tanks 20A, 20B arranged in the bow-stern direction FA can be changed as appropriate.

[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-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 in the ship's width direction Dw of the top plate 21A, the inner side wall 7A in the ship's width direction Dw of the top plate 21A, 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 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 width direction Dw is provided vertically above the ballast tank 20B when viewed from the fore-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 in the ship's width direction Dw of the top plate 21B, the inner side wall 7B in the ship's width direction Dw of the top plate 21B, and the upper deck 5. The tank 30B is provided on the top plate 21B via support legs 31.

[0027] As shown in Fig. 2, the tanks 30A, 30B are arranged in a row in the fore-aft direction FA. In this embodiment, the tanks 30A, 30B are arranged between adjacent partition walls 8 in the fore-aft direction FA. As a result, as shown in Fig. 1, each of the tanks 30A, 30B is arranged within a range A in the fore-aft direction FA in which the ballast tanks 20A, 20B are arranged with respect to at least one of the ballast tanks 20A, 20B. Here, in this embodiment, the tanks 30A, 30B are arranged within a range A in the fore-aft direction FA in which the ballast tanks 20A, 20B arranged on both sides of the hold compartments 10A-10D in the ship width direction Dw are arranged, but the tanks 30A, 30B do not have to be arranged in correspondence with all of the 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 type, spherical, rectangular, etc. 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 heat insulating material (not shown) to suppress heat input from the outside to the liquefied carbon dioxide in the tank 30. In addition, each tank 30 may 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, etc. The tank dome 33 extends upward from the tank 30 in the vertical direction Dv, 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, making piping installation easy.

[0030] (Procedures for the operation of ships) Fig. 4 is a flowchart showing the steps of a ship operation method according to an embodiment of the present disclosure. As shown in Fig. 4, a ship operation method S10 according to the present embodiment includes a step S11 of loading bulk cargo, a step S12 of sailing to a facility that uses the bulk cargo 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] FIG. 5 is a cross-sectional view showing a state in which bulk cargo is stored in a hold in a ship operation method according to an embodiment of the present disclosure. In step S11 of loading bulk cargo, as shown in FIG. 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 dumped 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, where the ship 1 sails to the facility that utilizes the bulk cargo, the ship 1 sails from the port of the ore producing area where the bulk cargo B was loaded into the hold 10 in step S11 as its departure point, to the facility that utilizes the bulk cargo B as its destination. At this time, the ship 1 sails 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 manufactures steel using iron ore as the bulk cargo B as a raw material.

[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 a tank and ballast water is stored in a ballast tank in a ship navigation method according to an embodiment of the present disclosure. After completion of step S13, step S14 is carried out to store the liquefied carbon dioxide L. In step S14 of this embodiment, as shown in Fig. 6, ballast water W is stored in the ballast tanks 20A and 20B, and liquefied carbon dioxide L is stored in the tank 30. In this embodiment, in step S14, liquefied carbon dioxide L, which is obtained by liquefying carbon dioxide generated during steelmaking using iron ore as a raw material at a steelworks, which is a utilization facility of the bulk cargo B, is stored in the tank 30. The amount of ballast water W to be stored in the ballast tanks 20A and 20B is adjusted according to the amount of liquefied carbon dioxide L loaded and stored in the tank 30 so that the stability and stability of the ship 1 are maintained.

[0036] Here, the step S14 of storing the liquefied carbon dioxide L may be performed at a port different from the port where the step S13 of unloading the bulk cargo B was performed. In this case, the ship 1 is navigated from the port where the 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 and 20B at the port where the 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 the step S14 is performed. Although the case where the ballast water W is stored in the ballast tanks 20A and 20B in step S14 has been described, storing the ballast water W in the ballast tanks 20A and 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, 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 ship 1 arrives at the other destination, a step S16 of unloading the liquefied carbon dioxide is carried out. In the 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 the navigation method S10 for the ship 1, the above-described steps S11 to S16 are sequentially repeated.

[0039] (Action and effect) The ship 1 of the above embodiment is equipped with ballast tanks 20A and 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 accommodates the bulk cargo B in the hold 10 and navigates to the destination with the ballast tanks 20A and 20B empty, while after unloading the bulk cargo B at the destination, the ship 1 can navigate to another destination by storing ballast water W in the ballast tanks 20A and 20B and storing liquefied carbon dioxide L in the tank 30. This makes it possible to prevent the ship 1 from navigating in an empty state. As a result, the operation efficiency of the ship 1 can be improved.

[0040] 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, and thus the hull 2 ​​can be made more stable, compared to a case in which the tank 30 is provided above the upper deck 5. In addition, 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. In addition, the ballast water W stored in the ballast tanks 20A and 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, the tank 30 is located vertically above the ballast tanks 20A, 20B in the up-down direction Dv when viewed from the bow-stern direction FA, which facilitates the construction of 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 of the fore-aft direction FA in which the ballast tanks 20A, 20B are arranged in a row in the fore-aft direction FA, with respect to at least one of the multiple ballast tanks 20A, 20B, so that the liquefied carbon dioxide L stored in the tank 30 can effectively function as ballast.

[0044] In the above embodiment, the tank 30 (30A, 30B) is accommodated in the space SA, SB surrounded by the top plates 21A, 21B of the ballast tanks 20A, 20B, the outer ship sides 3A, 3B in the ship width direction Dw of the top plates 21A, 21B, the inner side walls 7A, 7B in the ship width direction Dw of the top plates 21A, 21B, and the upper deck 5. This makes it easier to ensure thermal insulation in the tank 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 the destination that uses the bulk cargo B, and 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 to produce liquefied carbon dioxide L, which is stored in the tank 30. This improves the operation 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 plant and captures carbon dioxide generated when the iron ore is used to make steel at the steel plant, thereby improving the operating efficiency of the ship 1 and also improving the efficiency of the operation of the steel plant.

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

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

[0050] (1) A ship 1 in a first embodiment comprises a hull 2 ​​having a pair of ship sides 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 ship sides 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, while 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 operation efficiency of the ship 1 can be improved.

[0052] (2) The ship 1 according to a 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 a case in which the tank 30 is provided above the upper deck 5. Also, with the hold 10 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 a 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 in a fourth aspect is any one of the ships 1 of (1) to (3), wherein 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 facilitates the construction of piping for loading liquefied carbon dioxide into the tank 30 and piping for discharging liquefied carbon dioxide from the tank 30.

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

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

[0060] (6) The ship 1 in the sixth aspect is any one of the ships 1 in (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 transverse 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 ship sides 3A, 3B on the outer side of the top plates 21A, 21B in the ship's transverse direction Dw, the side walls 7A, 7B on the inner side of the top plates 21A, 21B in the ship's transverse 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) An operation method S10 of a ship 1 relating to a seventh aspect 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) An eighth aspect of the method S10 for operating a ship 1 is a method S10 for operating a ship 1 of (7), in which in the step S14 for storing the liquefied carbon dioxide L, the liquefied carbon dioxide L liquefied from carbon dioxide generated at the utilization facility is stored in the tank 30.

[0065] This makes it possible to improve the operation efficiency of the ship 1 and to efficiently capture carbon dioxide at the utilization facility.

[0066] (9) A ninth aspect of the present invention relates to a method S10 for operating a ship 1, which 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 the steelworks, to capture the carbon dioxide generated when the iron ore is used to make steel at the steelworks. This increases the operating efficiency of the ship 1 and also improves the efficiency of the steelworks' operations. [Explanation of symbols]

[0068] 1... Ship 2... Hull 2a... Bow 2b... Stern 3A, 3B... Side 4... Ship bottom 5... Upper deck 6... Superstructure 7A, 7B... Side wall 8... Compartment wall 10... Hold 10A-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 hull having a pair of sides and an upper deck; A plurality of ballast tanks are provided within the hull along each of the pair of ship sides; A hold provided within the hull between the plurality of ballast tanks in the ship width direction and capable of accommodating bulk cargo; a tank provided above the ballast tank within the hull and capable of storing liquefied carbon dioxide; ship.

2. The tank is provided below the upper deck.

2. The watercraft of claim 1.

3. The tanks are provided on both sides of the hold in the ship width direction.

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

4. The tank is provided vertically above the ballast tank when viewed from the bow-stern direction of the hull.

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

5. The ballast tanks are arranged in a row in the bow-stern direction of the hull, The tank is provided within a bow-stern range of at least one of the ballast tanks.

5. The watercraft of claim 4.

6. The hold is formed between a pair of side walls provided on both sides of the hull in the ship width direction, The tank is accommodated in a space surrounded by a top plate of the ballast tank, the ship side on the outer side of the top plate in the ship width direction, the side wall on the inner side of the top plate in the ship width direction, and the upper deck.

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

7. A method for operating a ship according to claim 1, comprising the steps of: storing the bulk cargo in the hold and navigating the vessel to a destination of a facility for utilizing the bulk cargo while emptying the ballast tanks; unloading the bulk cargo from the hold at the destination; storing liquefied carbon dioxide in the tank; and a step of navigating the hold in an empty state and with liquefied carbon dioxide stored in the tank to a destination other than the destination. How the ship is operated.

8. In the step of storing the liquefied carbon dioxide, The carbon dioxide generated at the utilization facility is liquefied and the liquefied carbon dioxide is stored in the tank. A method for operating a ship according to claim 7.

9. said bulk cargo being iron ore; The utilization facility is a steelworks. A method for operating a ship according to claim 7 or 8.

Images