AU2020404622B9

AU2020404622B9 - Ship and method of loading liquefied carbon dioxide into ship

Info

Publication number: AU2020404622B9
Application number: AU2020404622A
Authority: AU
Inventors: Toshinori Ishida; Shinsuke Morimoto; Toshio Ogata
Original assignee: Mitsubishi Shipbuilding Co Ltd
Current assignee: Mitsubishi Shipbuilding Co Ltd
Priority date: 2019-12-19
Filing date: 2020-09-08
Publication date: 2024-05-02
Anticipated expiration: 2040-09-08
Also published as: AU2020404622B2; FI4056459T3; EP4056459B1; EP4056459A1; DK4056459T3; KR20220093214A; JP2021095051A; JP7350647B2; AU2020404622A1; EP4056459A4; WO2021124619A1; CN114761317B; CN114761317A

Abstract

This ship includes a hull, a tank, and loading piping. The hull has a pair of ship sides. The tank is provided in the hull. The tank can store liquefied carbon dioxide. The loading piping loads liquefied carbon dioxide, supplied from the outside of the ship, into the tank. The loading piping includes transport piping, upper loading piping, lower loading piping, a first on-off valve, and a second on-off valve. The transport piping has a connection part connected to the outside of the ship. The transport piping extends into the hull. The upper loading piping branches off and extends from the transport piping. The upper loading piping opens at the upper part of the inside of the tank. The lower loading piping branches off and extends from the transport piping. The lower loading piping opens at the lower part of the inside of the tank. The first on-off valve is provided in the upper loading piping. The second on-off valve is provided in the lower loading piping.

Description

SHIP AND METHOD OF LOADING LIQUEFIED CARBON DIOXIDE INTO SHIP

Technical Field

[00011

The present disclosure relates to a ship and a method

of loading liquefied carbon dioxide into a ship.

This application claims the right of priority based on

Japanese Patent Application No. 2019-228784 filed with the

Japan Patent Office on December 19, 2019, the content of

which is incorporated herein by reference.

Background Art

[0002]

PTL 1 discloses loading a liquefied gas such as LNG

(Liquefied Natural Gas) into a tank through a pipe led from

the vicinity of a top portion of the tank to the vicinity

of a bottom portion of the tank.

Citation List

Patent Literature

[00031

[PTL 1] Japanese Patent No. 5769445

Summary of Invention

Technical Problem

[0004]

Incidentally, there is a demand for carrying liquefied carbon dioxide by using a tank as in PTL 1. In the liquefied carbon dioxide, the pressure of a triple point (hereinafter referred to as triple point pressure) at which a gas phase, a liquid phase, and a solid phase coexist is higher than the triple point pressure of LNG or LPG. Therefore, the triple point pressure becomes close to the operating pressure of the tank. In a case where the liquefied carbon dioxide is contained in the tank, for the following reasons, there is a possibility that the liquefied carbon dioxide may be solidified to generate dry ice.

[00051

In the tank of PTL 1, a lower end of a loading pipe,

which is open in the tank, is disposed at a lower portion

in the tank. With such disposition, the vicinity of the

opening of the loading pipe is pressurized with an increase

in liquid head. Therefore, flash evaporation of the

liquefied gas discharged from the opening of the loading

pipe can be suppressed. However, in a pipe top portion

disposed at the highest position of the loading pipe, the

pressure of the liquefied carbon dioxide inside is reduced

by the amount corresponds to the height difference between

the liquid level of the liquefied carbon dioxide in the tank

and the pipe top portion with respect to the pressure of

the liquefied carbon dioxide at the pipe lower end.

[00061

As a result, depending on a tank operating pressure,

the pressure of the liquefied carbon dioxide becomes equal

to or lower than the triple point pressure in the pipe top

portion of the loading pipe where the pressure of the

liquefied carbon dioxide becomes the lowest, or the

liquefied carbon dioxide evaporates, and due to the

evaporation latent heat thereof, the temperature of the

liquefied carbon dioxide remaining without evaporating is

lowered, so that there is a possibility that the liquefied

carbon dioxide may be solidified in the pipe top portion of

the loading pipe to generate dry ice.

Then, in this manner, if dry ice is generated in the

loading pipe, the flow of the liquefied carbon dioxide in

the loading pipe is obstructed, so that there is a

possibility that the operation of the tank may be affected.

[0007]

Preferred embodiments of the present invention seek to

provide a ship and a method of loading liquefied carbon

dioxide into a ship, in which it is possible to suppress

the generation of dry ice in a loading pipe and smoothly

perform the operation of a tank.

Solution to Problem

[0008]

According to an aspect of the present invention, there

is provided a ship comprising: A ship comprising:a hull having a pair of broadsides; a tank that is provided in the hull and is capable of storing liquefied carbon dioxide; and a loading pipe that loads liquefied carbon dioxide that is supplied from an outside of the ship into the tank, wherein the loading pipe includes a transport pipe having a connection part for connection with the outside of the ship, an upper loading pipe that branches off and extends from the transport pipe and is open to an upper portion in the tank, a lower loading pipe that branches off and extends from the transport pipe and is open to a lower portion in the tank, a first on-off valve provided in the upper loading pipe, a second on-off valve provided in the lower loading pipe, a spray pipe that branches off from the transport pipe to reach inside the tank and has a plurality of injection holes disposed on a lower side with respect to an opening of the upper loading pipe and on an upper side with respect to an opening of the lower loading pipe, and an on-off valve provided in the spray pipe.

[0009a]

According to a further aspect of the present invention,

there is provided a method of loading liquefied carbon

dioxide into a ship as described herein, the method

comprising the steps of: a step of opening the on-off valve

to inject the liquefied carbon dioxide into the tank from

the spray pipe; a step of opening the first on-off valve to load the liquefied carbon dioxide into the tank through the upper loading pipe; and a step of closing the first on-off valve and opening the second on-off valve to load the liquefied carbon dioxide into the tank through the lower loading pipe, after a liquid level of the liquefied carbon dioxide in the tank has reached a switching level set to be higher than the opening of the lower loading pipe.

[0009b]

According to another aspect of the present invention,

there is provided a ship comprising: a hull having a pair

of broadsides; a tank that is provided in the hull and is

capable of storing liquefied carbon dioxide; and a loading

pipe that loads liquefied carbon dioxide that is supplied

from an outside of the ship into the tank, wherein the

loading pipe includes a transport pipe having a connection

part for connection with the outside of the ship, an upper

loading pipe that branches off and extends from the

transport pipe and is open in the tank at a height equal to

or higher than a height when a liquid level of the liquefied

carbon dioxide is at a height corresponding to 90% of a

volume of the tank in an up-down direction, a lower loading

pipe that branches off and extends from the transport pipe

and is open in the tank at a height equal to or lower than

a height when the liquid level of the liquefied carbon

dioxide is at a height corresponding to 10% of the volume of the tank in the up-down direction, a first on-off valve provided in the upper loading pipe, and a second on-off valve provided in the lower loading pipe.

[0009c]

According to yet a further aspect of the present

invention, there is provided a ship comprising: a hull

having a pair of broadsides; a tank that is provided in the

hull and is capable of storing liquefied carbon dioxide;

and a loading pipe that loads liquefied carbon dioxide that

is supplied from an outside of the ship into the tank,

wherein the loading pipe includes a transport pipe having a

connection part for connection with the outside of the ship,

an upper loading pipe that branches off and extends from

the transport pipe and is open to an upper portion in the

tank, a lower loading pipe that branches off and extends

from the transport pipe and is open to a lower portion in

the tank, a first on-off valve provided in the upper loading

pipe, and a second on-off valve provided in the lower

loading pipe, wherein the ship further comprising: a control

device that controls opening/closing operations of the first

on-off valve and the second on-off valve, based on a liquid

level of the liquefied carbon dioxide in the tank, when the

liquefied carbon dioxide is loaded into the tank, and a

liquid level detection unit that detects the liquid level

of the liquefied carbon dioxide that is stored in the tank, wherein the control device opens the first on-off valve to load the liquefied carbon dioxide into the tank through the upper loading pipe, and opens the second on-off valve to load the liquefied carbon dioxide into the tank through the lower loading pipe in a case where the liquid level of the liquefied carbon dioxide that is detected by the liquid level detection unit reaches a switching level set to be higher than the opening of the lower loading pipe.

Advantageous Effects of Invention

[0010]

According to the ship and the method of loading

liquefied carbon dioxide into a ship of the present

disclosure, it is possible to suppress the generation of

dry ice in a loading pipe and smoothly perform the operation

of a tank.

Brief Description of Drawings

[0011]

Fig. 1 is a plan view showing a schematic configuration

of a ship according to an embodiment of the present

disclosure.

Fig. 2 is a side sectional view showing a tank and a

loading pipe provided in the ship according to the

embodiment of the present disclosure.

Fig. 3 is a side sectional view showing a state where

liquefied carbon dioxide is loaded into a tank from an upper loading pipe, in the ship according to the embodiment of the present disclosure.

Fig. 4 is a side sectional view showing a state where

liquefied carbon dioxide is loaded into a tank from a spray

pipe, in the ship according to the embodiment of the present

disclosure.

Fig. 5 is a diagram showing a hardware configuration

of a control device provided on the ship according to the

embodiment of the present disclosure.

Fig. 6 is a functional block diagram of the control

device provided on the ship according to the embodiment of

the present disclosure.

Fig. 7 is a flowchart showing procedure of a method of

loading liquefied carbon dioxide into a ship according to

the embodiment of the present disclosure.

Fig. 8 is a flowchart showing procedure of processing

that is performed by the control device in order to execute

the method of loading liquefied carbon dioxide into a ship

according to the embodiment of the present disclosure.

Fig. 9 is a side sectional view showing a tank and a

loading pipe provided in a ship according to a modification

example the embodiment of the present disclosure.

Description of Embodiments

[00121

Hereinafter, a ship according to an embodiment of the present disclosure will be described with reference to Figs.

1 and 2.

(Hull Composition of Ship)

A ship 1 of an embodiment of the present disclosure

carries liquefied carbon dioxide or various liquefied gases

including liquefied carbon dioxide. As shown in Figs. 1

and 2, the ship 1 includes at least a hull 2, a tank 21,

and a loading pipe 30. In this embodiment, a case of

carrying liquefied carbon dioxide will be described as an

example.

[0013]

(Configuration of Hull)

As shown in Fig. 1, the hull 2 has a pair of broadsides

3A and 3B forming an outer shell thereof, a ship bottom (not

shown), and an exposure deck 5. The broadsides 3A and 3B

are provided with a pair of broadside outer plates forming

the left and right broadsides respectively. The ship bottom

(not shown) is provided with a ship bottom outer plate

connecting the broadsides 3A and 3B. Due to the pair of

broadsides 3A and 3B and the ship bottom (not shown), the

outer shell of the hull 2 has a U-shape in a cross-section

orthogonal to a bow-stern direction Da. The exposure deck

is an all-deck that is exposed to the outside. In the

hull 2, a superstructure 7 having an accommodation space is

formed on the exposure deck 5 on the stern 2b side.

[00141

In the hull 2, a tank system storage compartment (a

hold) 8 is formed on the bow 2a side with respect to the

superstructure (the accommodation space) 7. The tank system

storage compartment 8 is a closed compartment that is

recessed toward the ship bottom (not shown) below the

exposure deck 5 and protrudes upward or has the exposure

deck 5 as a ceiling.

[0015]

(Configuration of Tank)

A plurality of tanks 21 are provided in the tank system

storage compartment 8. In the tank 21 in this embodiment,

for example, a total of seven tanks 21 are provided in the

tank system storage compartment 8. The layout and the

number of tanks 21 installed in the tank system storage

compartment 8 are not limited in any way. In this embodiment,

each tank 21 has, for example, a cylindrical shape extending

in the horizontal direction (specifically, the bow-stern

direction). The tank 21 contains liquefied carbon dioxide

L inside. The tank 21 is not limited to a cylindrical shape

and may have a spherical shape.

[0016]

(Configuration of Loading Pipe)

The loading pipe 30 loads the liquefied carbon dioxide

L, which is supplied from the outside of the ship, such as a liquefied carbon dioxide supply facility on land or a bunker ship, into the tank 21.

As shown in Fig. 2, the loading pipe 30 includes a

transport pipe 31, an upper loading pipe 32, a lower loading

pipe 33, a first on-off valve 34, a second on-off valve 35,

and a spray pipe 38.

[0017]

The loading pipe 30 has a connection part 31j provided

at a bunker station or the like and connected to the outside

of the ship. The connection part 31j has, for example, a

flange or the like, and is provided on at least one (for

example, the broadside 3A) of the broadsides 3A and 3B. A

supply pipe (not shown) for supplying liquefied carbon

dioxide from the outside of the ship, such as a liquefied

carbon dioxide supply facility or a bunker ship, can be

mounted to or dismounted from the connection part 31j. The

loading pipe 30 is mainly provided in the hull 2.

[0018]

The upper loading pipe 32 branches off from the

transport pipe 31 and reaches the inside of the tank 21.

The upper loading pipe 32 of this embodiment extends

downward in a ship height direction (hereinafter referred

to as an up-down direction Dv) from the transport pipe 31.

An opening 32a formed at a lower end of the upper loading

pipe 32 is located at an upper portion in the tank 21. Here, the upper portion in the tank 21 means a region in the tank

21 above the center of the tank 21 in the up-down direction

Dv. The opening 32a of the upper loading pipe 32 may be

located at a height equal to or higher than a height Ha when

a liquid level Lf of the liquefied carbon dioxide L is at a

height corresponding to, for example, 90% of the volume of

the tank 21 in the up-down direction Dv. As shown in Fig.

3, the upper loading pipe 32 supplies the liquefied carbon

dioxide L into the tank 21 from the opening 32a provided at

the upper portion in the tank 21.

[0019]

The lower loading pipe 33 branches off from the

transport pipe 31 and reaches the inside of the tank 21,

similar to the upper loading pipe 32. The lower loading

pipe 33 of this embodiment extends downward in the up-down

direction Dv from the transport pipe 31. An opening 33a

formed at a lower end of the lower loading pipe 33 is located

at a lower portion in the tank 21. Here, the lower portion

in the tank 21 means a region in the tank 21 below the

center of the tank 21 in the up-down direction Dv. The

opening 33a of the lower loading pipe 33 may be located at

a height equal to or lower than a height Hb when the liquid

level Lf of the liquefied carbon dioxide L is at a height

corresponding to, for example, 10% of the volume of the tank

21 in the up-down direction Dv. As shown in Fig. 2, the lower loading pipe 33 supplies the liquefied carbon dioxide

L into the tank 21 from the opening 33a provided at the

lower portion in the tank 21.

[0020]

The first on-off valve 34 is provided in the upper

loading pipe 32. The first on-off valve 34 opens and closes

the flow path in the upper loading pipe 32.

The second on-off valve 35 is provided in the lower

loading pipe 33. The second on-off valve 35 opens and

closes the flow path in the lower loading pipe 33.

Each of the first on-off valve 34 and the second on

off valve 35 can be switched between an opened state and a

closed state, based on a control signal that is output from

a control device 60 (described later).

[0021]

The spray pipe 38 branches off from the transport pipe

31 and reaches the inside of the tank 21. The spray pipe

38 has a plurality of injection holes (not shown). The

injection holes of the spray pipe 38 exemplified in this

embodiment are disposed on the lower side with respect to

the opening 32a of the upper loading pipe 32 and the upper

side with respect to the opening 33a of the lower loading

pipe 33 in the up-down direction Dv. As shown in Fig. 4,

the spray pipe 38 injects the liquefied carbon dioxide L

that is supplied through the transport pipe 31 into the tank

21 from the plurality of injection holes. The spray pipe

38 is provided with an on-off valve 39 for opening and

closing the flow path from the transport pipe 31 to the

spray pipe 38 on the side close to the transport pipe 31.

The on-off valve 39 can be switched between an opened state

and a closed state, based on a control signal that is output

from the control device 60 (described later).

[0022]

The ship 1 further includes a liquid level detection

unit 51, a pressure detection unit 52, and the control

device 60.

[0023]

(Configurations of Liquid Level Detection Unit and

Pressure Detection Unit)

The liquid level detection unit 51 detects the liquid

level Lf of the liquefied carbon dioxide L that is stored

in the tank 21. The liquid level detection unit 51 outputs

a detection signal of the detected liquid level Lf to the

control device 60.

[0024]

The pressure detection unit 52 detects a pressure P of

the liquefied carbon dioxide L in the loading pipe 30. The

pressure detection unit 52 is provided, for example, at a

top portion 30t, which is the highest position of the

loading pipe 30. The pressure detection unit 52 detects the pressure P of the liquefied carbon dioxide L in the loading pipe 30 at the top portion 30t. The pressure detection unit 52 outputs a detection signal of the detected pressure P to the control device 60.

[0025]

(Configuration of Control Device)

The control device 60 controls the opening/closing

operations of the first on-off valve 34 and the second on

off valve 35, based on the liquid level Lf of the liquefied

carbon dioxide L in the tank 21, which is detected by the

liquid level detection unit 51, when the liquefied carbon

dioxide L is loaded into the tank 21.

[0026]

(Hardware Configuration Diagram)

As shown in Fig. 5, the control device 60 is a computer

that includes a CPU 61 (Central Processing Unit), a ROM 62

(Read Only Memory), a RAM 63 (Random Access Memory), an HDD

64 (Hard Disk Drive), and a signal receiving module 65. The

detection signal from the liquid level detection unit 51

and the detection signal from the pressure detection unit

52 are input to the signal receiving module 65.

[0027]

(Functional Block Diagram)

As shown in Fig. 6, the control device 60 realizes a

functional configuration of each of a signal input unit 70, an on-off valve control unit 71, a liquid level determination unit 72, a pressure determination unit 73, and an output unit 74 by executing, for example, a program stored in the own device in advance by the CPU 61.

The signal input unit 70 receives the detection signal

from the liquid level detection unit 51 and the detection

signal from the pressure detection unit 52 by using the

signal receiving module 65.

[0028]

The liquid level determination unit 72 determines

whether or not the liquid level Lf of the liquefied carbon

dioxide L in the tank 21 detected by the liquid level

detection unit 51 has reached a switching level Ls (refer

to Figs. 2 and 3) set in advance to be higher than the

opening 33a of the lower loading pipe 33. As the switching

level Ls, for example, the liquid level Lf in the range

where the pressure P of the liquefied carbon dioxide L in

the loading pipe 30 at the top portion 30t becomes higher

than the triple point pressure of the liquefied carbon

dioxide L when only the second on-off valve 35 of the lower

loading pipe 33 is made be in an opened state is set.

Further, as the switching level Ls, a lower limit or the

liquid level Lf slightly higher than the lower limit, of

the liquid level Lf in the range where the pressure P of

the liquefied carbon dioxide L in the loading pipe 30 at the top portion 30t becomes higher than the triple point pressure of the liquefied carbon dioxide L, may be set. The switching level Ls can be obtained by, for example, an experiment, simulation, calculation, or the like.

[0029]

The pressure determination unit 73 determines whether

or not the pressure P of the liquefied carbon dioxide L

detected by the pressure detection unit 52 has been lowered

to a pressure equal to or lower than a reference pressure

Ps determined in advance. Here, the reference pressure Ps

is the triple point pressure of the liquefied carbon dioxide

L, or a pressure higher than the triple point pressure.

[0030]

The on-off valve control unit 71 controls the

opening/closing operations of the first on-off valve 34,

the second on-off valve 35, and the on-off valve 39.

The on-off valve control unit 71 makes the on-off valve

39 be in an opened state and the first on-off valve 34 and

the second on-off valve 35 be in a closed state, prior to

the loading of the liquefied carbon dioxide L into the tank

21. At the time of the start of the loading of the liquefied

carbon dioxide L into the tank 21, the on-off valve control

unit 71 makes the on-off valve 39 be in a closed state and

the first on-off valve 34 be in an opened state. Further,

after the start of the loading of the liquefied carbon dioxide L, the on-off valve control unit 71 makes the first on-off valve 34 be in a closed state and the second on-off valve 35 be in an opened state, in a case where the liquid level determination unit 72 determines that the liquid level

Lf of the liquefied carbon dioxide L detected by the liquid

level detection unit 51 has reached the switching level Ls.

The on-off valve control unit 71 outputs a control signal

for opening and closing the first on-off valve 34 and the

second on-off valve 35 to the first on-off valve 34 and the

second on-off valve 35 through the output unit 74. Further,

the on-off valve control unit 71 makes the first on-off

valve 34 be in an opened state, in a case where the pressure

of the liquefied carbon dioxide L detected by the pressure

detection unit 52 becomes equal to or lower than the

reference pressure Ps determined in advance, when the second

on-off valve 35 is made be in an opened state.

[0031]

(Procedure of Method of Loading Liquefied Carbon

Dioxide into Ship)

As shown in Fig. 7, a method S10 of loading the

liquefied carbon dioxide L into the ship 1 according to this

embodiment includes a step Sl of loading the liquefied

carbon dioxide through the upper loading pipe, and a step

S12 of loading the liquefied carbon dioxide through the

lower loading pipe.

[00321

In the step Sl of loading the liquefied carbon dioxide

through the upper loading pipe, first, only the on-off valve

39 among the first on-off valve 34, the second on-off valve

, and the on-off valve 39 is made be in an opened state.

Then, as shown in Fig. 4, the liquefied carbon dioxide L is

injected from the spray pipe 38 into the tank. In this way,

the inside of the tank 21 is cooled, the pressure in the

tank 21 is lowered, and more liquefied carbon dioxide L can

be loaded.

[00331

Thereafter, the on-off valve 39 is made be in a closed

state and the first on-off valve 34 is made be in an opened

state. In this way, as shown in Fig. 3, the liquefied

carbon dioxide L is loaded into the tank 21 through the

upper loading pipe 32. In this state, the upper loading

pipe 32 is open to the upper portion in the tank 21.

Therefore, the liquefied carbon dioxide L is discharged to

a gas phase in the tank 21 from the opening 32a of the upper

loading pipe 32. Further, a height difference Ahl from the

top portion 30t, which is located at the highest position

of the loading pipe 30, is smaller than a height difference

Ah2 between the opening 33a of the lower loading pipe 33,

which is open to the lower portion in the tank 21, and the

top portion 30t. Therefore, it is possible to suppress a decrease in the pressure of the liquefied carbon dioxide L in the top portion 30t of the loading pipe 30 regardless of the position of the liquid level Lf of the liquefied carbon dioxide L.

[00341

After the liquefied carbon dioxide L is loaded into

the tank 21 through the upper loading pipe 32 and the liquid

level Lf of the liquefied carbon dioxide L has reached the

switching level Ls set to be higher than the opening 33a of

the lower loading pipe 33, the processing transitions to

the step S12 of loading the liquefied carbon dioxide through

the lower loading pipe. In the step S12 of loading the

liquefied carbon dioxide through the lower loading pipe,

the first on-off valve 34 is made be in a closed state and

the second on-off valve 35 is made be in an opened state.

In this way, as shown in Fig. 2, the liquefied carbon dioxide

L is loaded into the tank 21 through the lower loading pipe

33. In this state, the liquefied carbon dioxide L is stored

to a level higher than the opening 33a of the lower loading

pipe 33 (specifically, a level higher than the switching

level Ls). Therefore, a pressure according to the height

of the liquid level Lf (specifically, the switching level

Ls or higher) of the liquefied carbon dioxide L stored in

the tank 21 is applied to the liquefied carbon dioxide L in

the lower loading pipe 33. In this way, the pressure of the liquefied carbon dioxide L in the top portion 30t of the loading pipe 30 is increased.

[00351

(Processing Procedure)

Next, procedure of processing for automatically

executing the method of loading the liquefied carbon dioxide

into the ship under the control of the control device 60

will be described.

As shown in Fig. 8, when the loading of the liquefied

carbon dioxide L into the tank 21 is started, first, the

control device 60 causes the on-off valve control unit 71

to make the on-off valve 39 of the spray pipe 38 be in an

opened state (step S21). Then, the liquefied carbon dioxide

L that is supplied from the outside of the ship is injected

into the tank 21 from the spray pipe 38, and the pressure

in the tank 21 is lowered.

[00361

Subsequently, the control device 60 causes the on-off

valve control unit 71 to make the on-off valve 39 be in a

closed state and the first on-off valve 34 be in an opened

state (step S22). Then, the liquefied carbon dioxide L,

which is supplied from the outside of the ship, is supplied

from the upper portion in the tank 21 through the transport

pipe 31 and the upper loading pipe 32. In this way, the

"step Sl of loading the liquefied carbon dioxide through the upper loading pipe" is executed.

[00371

After the start of the loading of the liquefied carbon

dioxide L, the liquid level determination unit 72 determines

whether or not the liquid level Lf of the liquefied carbon

dioxide L detected by the liquid level detection unit 51

has reached the switching level Ls set to be higher than

the opening 33a of the lower loading pipe 33 (step S23).

As a result of this determination, in a case where it is

determined that the liquid level Lf has not reached the

switching level Ls, the processing of step S23 is repeated

at time intervals determined in advance. On the other hand,

in a case where it is determined that the liquid level Lf

has reached the switching level Ls, the processing proceeds

to step S24.

[00381

In step S24, the on-off valve control unit 71 makes

the first on-off valve 34 be in a closed state and the

second on-off valve 35 be in an opened state. In this way,

the supply of the liquefied carbon dioxide L to the tank 21

through the upper loading pipe 32 is stopped. Further, the

supply of the liquefied carbon dioxide L to the tank 21

through the lower loading pipe 33 is started. In this way,

the "step S12 of loading the liquefied carbon dioxide

through the lower loading pipe" is executed.

[00391

After the start of the loading of the liquefied carbon

dioxide L through the lower loading pipe 33, the pressure

determination unit 73 determines whether or not the pressure

P detected by the pressure detection unit 52, that is, the

pressure P of the liquefied carbon dioxide L in the top

portion 30t of the loading pipe 30 has been lowered to a

pressure equal to or lower than the reference pressure Ps

determined in advance (step S25). As a result, in a case

where it is determined that the pressure of the liquefied

carbon dioxide L has reached the reference pressure Ps, the

processing proceeds to step S26.

[0040]

In step S26, the on-off valve control unit 71 operates

the second on-off valve 35 toward a closed state and the

first on-off valve 34 toward an opened state. At this time,

the second on-off valve 35 may be operated to a fully-closed

state in a short time or may be gradually closed, such as

being stepwise closed for each the opening degree set in

advance, for example. Similarly, the first on-off valve 34

may be operated to a fully-opened state in a short time or

may be gradually opened, such as being stepwise opened for

each opening degree determined in advance, for example.

[0041]

In this way, for example, in a case where the pressure

P of the liquefied carbon dioxide L is lowered to a pressure

equal to or lower than the reference pressure Ps while the

liquefied carbon dioxide L is being loaded through the lower

loading pipe 33, the first on-off valve 34 is operated in

an open direction. Then, as shown in Fig. 3, the liquefied

carbon dioxide L is supplied into the tank 21 from the upper

loading pipe 32. At this time, the opening 32a of the upper

loading pipe 32 is disposed in the gas phase above the

liquid level Lf of the liquefied carbon dioxide L loaded in

the tank 21. The pressure of the gas phase (the operating

pressure of the tank 21) is set to be higher than the

reference pressure Ps. Therefore, the pressure of the

liquefied carbon dioxide L in the top portion 30t of the

loading pipe 30 increases.

[00421

Thereafter, the pressure determination unit 73

determines whether or not the pressure of the liquefied

carbon dioxide L in the top portion 30t of the loading pipe

, which is detected by the pressure detection unit 52,

has been returned to a return pressure Pt determined in

advance (Pt > Ps) (Step S27). As a result of this

determination, in a case where it is determined that the

pressure of the liquefied carbon dioxide L has not reached

the return pressure Pt, the loading of the liquefied carbon

dioxide L from the upper loading pipe 32 is continued. On the other hand, in a case where in step S27, it is determined that the pressure of the liquefied carbon dioxide L has reached the return pressure Pt, the on-off valve control unit 71 makes the first on-off valve 34 be in a closed state and the second on-off valve 35 be in an opened state (step

S28). In this way, the liquefied carbon dioxide L returns

to a state of being supplied into the tank 21 from the lower

loading pipe 33.

[0043]

In this way, the liquefied carbon dioxide L is loaded

into the tank 21, and when loading of a predetermined amount

is completed, the on-off valve control unit 71 closes both

the first on-off valve 34 and the second on-off valve 35

and ends the loading of the liquefied carbon dioxide L.

[0044]

(Operation and Effects)

The ship 1 of the above embodiment includes the upper

loading pipe 32 that is open to the upper portion in the

tank 21, the lower loading pipe 33 that is open to the lower

portion in the tank 21, the first on-off valve 34 provided

in the upper loading pipe 32, and the second on-off valve

provided in the lower loading pipe 33.

In the ship 1, when the first on-off valve 34 is made

be in an opened state, the liquefied carbon dioxide L that

is supplied from the outside of the ship 1 is supplied from the upper portion of the tank 21 through the transport pipe

31 and the upper loading pipe 32. Further, when the second

on-off valve 35 is made be in an opened state, the liquefied

carbon dioxide L that is supplied from the outside of the

ship is supplied from the lower portion of the tank 21

through the transport pipe 31 and the lower loading pipe 33.

Since the opening 32a of the upper loading pipe 32 is located

at the upper portion in the tank 21, the height difference

from the top portion 30t that is at the highest position in

the loading pipe 30 is smaller than that in the opening 33a

of the lower loading pipe 33 that is located at the lower

portion in the tank 21, Therefore, when the liquefied carbon

dioxide L is loaded by the upper loading pipe 32, it is

possible to suppress a decrease in the pressure P of the

liquefied carbon dioxide L at the highest position in the

loading pipe 30 regardless of the liquid level Lf.

[0045]

Further, since the opening 33a of the lower loading

pipe 33 is located at the lower portion in the tank 21, if

the liquefied carbon dioxide L is stored to a level higher

than the opening 33a of the lower loading pipe 33, a pressure

according to the height of the liquid level Lf of the

liquefied carbon dioxide L stored in the tank 21 is applied

to the liquefied carbon dioxide L in the lower loading pipe

33. Then, if the liquid level Lf reaches a position where due to a rise of the liquid level Lf, an ambient pressure of the opening 33a becomes higher than the gas phase in the tank 21, it is possible to make the liquefied carbon dioxide

L flowing into the tank 21 from the opening 33a be in a

pressurized state (in other words, a sub-cool state).

Therefore, it is possible to suppress the occurrence of

flash evaporation of the liquefied carbon dioxide L flowing

into the tank 21.

[0046]

In this manner, by appropriately adjusting the

open/closed states of the first on-off valve 34 and the

second on-off valve 35 according to the storage state or

the like of the liquefied carbon dioxide L in the tank 21,

it is possible to suppress a decrease in the pressure of

the liquefied carbon dioxide L at the highest position of

the loading pipe 30. Therefore, it is possible to restrain

the pressure of the liquefied carbon dioxide L at the

highest position of the loading pipe 30 from approaching

the triple point pressure. In this way, it becomes possible

to suppress the generation of dry ice due to the

solidification of the liquefied carbon dioxide L in the

loading pipe 30 and smoothly perform the operation of the

tank 21.

[0047]

The ship 1 of the above embodiment further includes the control device 60 for controlling the opening/closing operations of the first on-off valve 34 and the second on off valve 35, based on the liquid level Lf of the liquefied carbon dioxide L in the tank 21, in a case where the liquefied carbon dioxide L is loaded into the tank 21.

By controlling the opening/closing operations of the

first on-off valve 34 and the second on-off valve 35 by the

control device 60, based on the liquid level Lf of the

liquefied carbon dioxide L in the tank 21, it is possible

to automatically suppress a decrease in the pressure of the

liquefied carbon dioxide L at the highest position of the

loading pipe 30.

[0048]

Further, in the ship 1 of the above embodiment, a

configuration is made such that the control device 60 makes

the second on-off valve 35 be in an opened state in a case

where the liquid level Lf of the liquefied carbon dioxide L

that is detected by the liquid level detection unit 51

reaches the switching level Ls set to be higher than the

opening 33a of the lower loading pipe 33.

By such control of the control device 60, it is

possible to load the liquefied carbon dioxide L into the

tank 21 through the upper loading pipe 32 by making the

first on-off valve 34 be in an opened state until the liquid

level Lf of the liquefied carbon dioxide L in the tank 21 reaches the set switching level Ls. Since the upper loading pipe 32 is open to the upper portion in the tank 21, it is possible to perform the loading of the liquefied carbon dioxide L in a state of suppressing a decrease in the pressure of the liquefied carbon dioxide L at the highest position of the loading pipe 30.

[0049]

Further, by such control of the control device 60, it

is possible to load the liquefied carbon dioxide L into the

tank 21 through the lower loading pipe 33 by making the

second on-off valve 35 be in an opened state in a case where

the liquid level Lf of the liquefied carbon dioxide L in

the tank 21 reaches the switching level Ls. At this time,

since the liquefied carbon dioxide L is stored to a level

higher than the switching level Ls, a pressure according to

the height of the liquid level Lf of the liquefied carbon

dioxide L stored in the tank 21, that is, the liquid level

Lf equal to or higher than the switching level Ls, is applied

to the liquefied carbon dioxide L in the lower loading pipe

33. In this way, it is possible to perform the loading of

the liquefied carbon dioxide L in a state where the pressure

of the liquefied carbon dioxide L at the highest position

of the loading pipe 30 is increased.

[0050]

Further, in the ship 1 of the above embodiment, a configuration is made such that the control device 60 makes the first on-off valve 34 be in an opened state in a case where the pressure P of the liquefied carbon dioxide L that is detected by the pressure detection unit 52 is equal to or lower than the reference pressure Ps determined in advance, when the second on-off valve 35 is in an opened state.

In this way, it is possible to make the first on-off

valve 34 be in an opened state in a case where the pressure

P of the liquefied carbon dioxide L in the loading pipe 30

is lowered to a pressure equal to or lower than the reference

pressure Ps in a state where the second on-off valve 35 is

made be in an opened state and the liquefied carbon dioxide

L is loaded into the tank 21 through the lower loading pipe

33. Since the upper loading pipe 32 is open to the upper

portion in the tank 21, it is possible to make the height

difference from the highest position of the loading pipe 30

small as compared with when the liquefied carbon dioxide L

is loaded through the lower loading pipe 33. In this way,

it becomes possible to increase the pressure of the

liquefied carbon dioxide L at the highest position of the

loading pipe 30.

[0051]

In the method of loading the liquefied carbon dioxide

L into the ship 1 of the above embodiment, when loading the liquefied carbon dioxide L into the tank 21, first, the first on-off valve 34 is made be in an opened state and the liquefied carbon dioxide L is loaded into the tank 21 through the upper loading pipe 32. Since the upper loading pipe 32 is open to the upper portion in the tank 21, it is possible to perform the loading of the liquefied carbon dioxide L in a state of suppressing a decrease in the pressure of the liquefied carbon dioxide L at the highest position of the loading pipe 30. Therefore, by restraining the pressure of the liquefied carbon dioxide L at the highest position of the loading pipe 30 from approaching the triple point pressure, it is possible to suppress the generation of dry ice due to the solidification of the liquefied carbon dioxide L in the loading pipe 30.

Therefore, it becomes possible to smoothly perform the

operation of the tank 21.

[00521

In the method of loading the liquefied carbon dioxide

L, thereafter, the second on-off valve 35 is made be in an

opened state and the liquefied carbon dioxide L is loaded

into the tank 21 through the lower loading pipe 33. In a

state where the liquefied carbon dioxide L is loaded through

the lower loading pipe 33, the liquefied carbon dioxide L

is stored to a level higher than the opening of the lower

loading pipe 33. Therefore, a pressure according to the height of the liquid level Lf of the liquefied carbon dioxide L stored in the tank 21 can be applied to the liquefied carbon dioxide L in the lower loading pipe 33.

In this way, flash evaporation of the liquefied carbon

dioxide L that has flowed into the tank 21 can be suppressed.

[00531

The embodiments of the present disclosure have been

described in detail above with reference to the drawings.

However, the specific configurations are not limited to the

embodiments, and also include design changes or the like

within a scope which does not deviate from the gist of the

present disclosure.

In the above embodiment, the lower loading pipe 33 is

provided so as to extend downward from the top portion of

the tank 21 into the tank 21. However, there is no

limitation thereto.

For example, as shown in Fig. 9, a lower loading pipe

33B may be provided so as to wrap around from the upper side

to the lower side of the tank 21, and an end portion of the

lower loading pipe 33B may be connected to a lower end 21b

of the tank 21. Even with such a configuration, the opening

33a of the lower loading pipe 33B can be located at the

lower portion in the tank 21.

[00541

Further, in the above embodiment, the processing

procedure in the method S10 of loading the liquefied carbon

dioxide L into the ship 1 and the control device 60 for

executing the method S10 of loading the liquefied carbon

dioxide L into the ship 1 are shown. However, the procedure

can be appropriately changed in order.

[00551

Further, in the above embodiment, the liquefied carbon

dioxide L is injected from the spray pipe 38 into the tank

21. However, the injection of the liquefied carbon dioxide

L may be omitted.

[00561

The ships 1 and the method of loading liquefied carbon

dioxide into the ship 1 described in the embodiment are

grasped as follows, for example.

[00571

(1) The ship 1 according to a first aspect includes

the hull 2 having a pair of broadsides 3A and 3B, the tank

21 that is provided in the hull 2 and is capable of storing

the liquefied carbon dioxide L, and the loading pipe 30 that

loads the liquefied carbon dioxide L that is supplied from

the outside of the ship into the tank 21, in which the

loading pipe 30 includes the transport pipe 31 having the

connection part 31j for connection with the outside of the ship and extending into the hull 2, the upper loading pipe

32 that branches off and extends from the transport pipe 31

and is open to the upper portion in the tank 21, the lower

loading pipe 33 that branches off and extends from the

transport pipe 31 and is open to the lower portion in the

tank 21, the first on-off valve 34 provided in the upper

loading pipe 32, and the second on-off valve 35 provided in

the lower loading pipe 33.

[00581

In the ship 1, when the first on-off valve 34 is opened,

the liquefied carbon dioxide L that is supplied from the

outside of the ship is supplied from the upper portion in

the tank 21 through the transport pipe 31 and the upper

loading pipe 32. Further, when the second on-off valve 35

is opened, the liquefied carbon dioxide L that is supplied

from the outside of the ship is supplied from the lower

portion in the tank 21 through the transport pipe 31 and

the lower loading pipe 33.

Since the upper loading pipe 32 is open to the upper

portion in the tank 21, the height difference from the

highest position in the loading pipe 30 is small as compared

with that in the lower loading pipe 33 that is open to the

lower portion in the tank 21. In this way, it is possible

to suppress a decrease in the pressure of the liquefied

carbon dioxide L at the highest position of the loading pipe regardless of the liquid level Lf in the tank 21.

Further, since the lower loading pipe 33 is open to

the lower portion in the tank 21, when the liquefied carbon

dioxide L is stored to a level higher than the opening of

the lower loading pipe 33, a pressure according to the

height of the liquid level Lf of the liquefied carbon

dioxide L stored in the tank 21 is applied to the liquefied

carbon dioxide L in the lower loading pipe 33. In this way,

the pressure of the liquefied carbon dioxide L at the

highest position of the loading pipe 30 can be increased.

In this manner, by appropriately adjusting the opening

and closing of the first on-off valve 34 and the second on

off valve 35 according to the storage situation or the like

of the liquefied carbon dioxide L in the tank 21, it is

possible to suppress a decrease in the pressure of the

liquefied carbon dioxide L at the highest position in the

loading pipe 30. Therefore, the pressure of the liquefied

carbon dioxide L at the highest position of the loading pipe

can be restrained from approaching the triple point

pressure. In this way, it is possible to suppress the

generation of dry ice due to the solidification of the

liquefied carbon dioxide L in the loading pipe 30. As a

result, in a case where the liquefied carbon dioxide L is

contained in the tank 21, it is possible to suppress the

generation of dry ice in the loading pipe 30 and smoothly perform the operation of the tank 21.

[00591

(2) In the ship 1 according to a second aspect, the

ship according to the above (1) further includes the control

device 60 that controls the opening/closing operations of

the first on-off valve 34 and the second on-off valve 35,

based on the liquid level Lf of the liquefied carbon dioxide

L in the tank 21, in a case where the liquefied carbon

dioxide L is loaded into the tank 21.

[00601

In this way, the control device 60 controls the

opening/closing operations of the first on-off valve 34 and

the second on-off valve 35, based on the liquid level Lf of

the liquefied carbon dioxide L in the tank 21, so that it

is possible to automatically suppress a decrease in the

pressure of the liquefied carbon dioxide L at the highest

position in the loading pipe 30.

[0061]

(3) In the ship 1 according to the above (3), the ship

1 of the above (2) further includes the liquid level

detection unit 51 that detects the liquid level Lf of the

liquefied carbon dioxide L that is stored in the tank 21,

in which the control device 60 opens the first on-off valve

34 to load the liquefied carbon dioxide L into the tank 21

through the upper loading pipe 32, and opens the second on off valve 35 to load the liquefied carbon dioxide L into the tank 21 through the lower loading pipe 33 in a case where the liquid level Lf of the liquefied carbon dioxide L that is detected by the liquid level detection unit 51 reaches the switching level Ls set to be higher than the opening 33a of the lower loading pipe 33.

[0062]

In this way, by the control of the control device 60,

the first on-off valve 34 is opened and the liquefied carbon

dioxide L is loaded into the tank 21 through the upper

loading pipe 32 until the liquid level Lf of the liquefied

carbon dioxide L in the tank 21 reaches the set switching

level Ls. Since the upper loading pipe 32 is open to the

upper portion in the tank 21, the loading of the liquefied

carbon dioxide L can be performed in a state of suppressing

a decrease in the pressure of the liquefied carbon dioxide

L at the highest position in the loading pipe 30.

Further, by the control of the control device 60, when

the liquid level Lf of the liquefied carbon dioxide L in

the tank 21 has reached the switching level Ls set to be

higher than the opening 33a of the lower loading pipe 33,

the second on-off valve 35 is opened and the liquefied

carbon dioxide L is loaded into the tank 21 through the

lower loading pipe 33. In this state, the liquefied carbon

dioxide L is stored to a level higher than the opening of the lower loading pipe 33, and therefore, a pressure according to the height of the liquid level Lf of the liquefied carbon dioxide L stored in the tank 21 is applied to the liquefied carbon dioxide L in the lower loading pipe

33. In this way, it is possible to perform the loading of

the liquefied carbon dioxide L in a state where the pressure

of the liquefied carbon dioxide L at the highest position

of the loading pipe 30 is increased.

[00631

(4) In the ship 1 according to a fourth aspect, the

ship 1 of the above (2) or (3) further includes the pressure

detection unit 52 that detects the pressure of the liquefied

carbon dioxide L in the loading pipe 30, in which the control

device 60 opens the first on-off valve 34 in a case where

the pressure P of the liquefied carbon dioxide L that is

detected by the pressure detection unit 52 is equal to or

lower than the reference pressure Ps determined in advance,

in a state where the second on-off valve 35 is opened.

[0064]

In this way, the first on-off valve 34 is opened in a

case where the pressure P of the liquefied carbon dioxide L

in the loading pipe 30 has been lowered to a pressure equal

to or lower than the reference pressure Ps in a state where

the second on-off valve 35 is opened and the liquefied

carbon dioxide L is loaded into the tank 21 through the lower loading pipe 33. Since the upper loading pipe 32 is open to the upper portion in the tank 21, it is possible to make the height difference from the highest position in the loading pipe 30 small as compared with when the liquefied carbon dioxide L is loaded through the lower loading pipe

33. In this way, it is possible to perform the loading of

the liquefied carbon dioxide L in a state of suppressing a

decrease in the pressure of the liquefied carbon dioxide L

at the highest position in the loading pipe 30.

[00651

(5) The method of loading the liquefied carbon dioxide

L into the ship 1 according to a fifth aspect is a method

of loading the liquefied carbon dioxide L into the ship 1

of any one of the above (1) to (4) including: a step Sl of

opening the first on-off valve 34 to load the liquefied

carbon dioxide L into the tank 21 through the upper loading

pipe 32, and a step S12 of closing the first on-off valve

34 and opening the second on-off valve 35 to load the

liquefied carbon dioxide L into the tank 21 through the

lower loading pipe 33, after the liquid level Lf of the

liquefied carbon dioxide L in the tank 21 has reached the

switching level Ls set to be higher than the opening 33a of

the lower loading pipe 33.

[00661

In this way, when the liquefied carbon dioxide L is loaded into the tank 21, first, the first on-off valve 34 is opened and the liquefied carbon dioxide L is loaded into the tank 21 through the upper loading pipe 32. Since the upper loading pipe 32 is open to the upper portion in the tank 21, the loading of the liquefied carbon dioxide L can be performed in a state of suppressing a decrease in the pressure of the liquefied carbon dioxide L at the highest position in the loading pipe 30.

Thereafter, the second on-off valve 35 is opened and

the liquefied carbon dioxide L is loaded into the tank 21

through the lower loading pipe 33. In this state, the

liquefied carbon dioxide L is stored to a level higher than

the opening of the lower loading pipe 33, and therefore, a

pressure according to the height of the liquid level Lf of

the liquefied carbon dioxide L stored in the tank 21 is

applied to the liquefied carbon dioxide L in the lower

loading pipe 33. In this way, it is possible to perform

the loading of the liquefied carbon dioxide L in a state

where the pressure of the liquefied carbon dioxide L at the

highest position of the loading pipe 30 is increased.

In this way, the pressure of the liquefied carbon

dioxide L at the highest position of the loading pipe 30 is

restrained from approaching the triple point pressure. In

this way, it is possible to suppress the generation of dry

ice due to the solidification of the liquefied carbon dioxide L in the loading pipe 30. As a result, in a case where the liquefied carbon dioxide L is contained in the tank 21, it is possible to suppress the generation of dry ice in the loading pipe 30 and smoothly perform the operation of the tank 21.

Industrial Applicability

[0067]

According to the ship and the method of loading

liquefied carbon dioxide into a ship of the present

disclosure, it is possible to suppress the generation of

dry ice in a loading pipe and smoothly perform the operation

of a tank.

[0068]

Throughout this specification and the claims which

follow, unless the context requires otherwise, the word

"comprise", and variations such as "comprises" and

"comprising", will be understood to imply the inclusion of

a stated integer or step or group of integers or steps but

not the exclusion of any other integer or step or group of

integers or steps.

[0069]

While various embodiments of the present invention

have been described above, it should be understood that they

have been presented by way of example only, and not by way

of limitation. It will be apparent to a person skilled in the relevant art that various changes in form and detail can be made therein without departing from the spirit and scope of the invention. Thus, the present invention should not be limited by any of the above described exemplary embodiments.

Reference Signs List

[00701

1: ship

2: hull

2a: bow

2b: stern

3A, 3B: broadside

5: exposure deck

7: superstructure

8: tank system storage compartment

21: tank

21b: lower end

30: loading pipe

30t: top portion

31: transport pipe

31j: connection part

32: upper loading pipe

32a: opening

33, 33B: lower loading pipe

33a: opening

34: first on-off valve

: second on-off valve

38: spray pipe

39: on-off valve

51: liquid level detection unit

52: pressure detection unit

: control device

61: CPU

62: ROM

63: RAM

64: HDD

: signal receiving module

: signal input unit

71: on-off valve control unit

72: liquid level determination unit

73: pressure determination unit

74: output unit

L: liquefied carbon dioxide

Lf: liquid level

Ls: switching level

Claims

Claims

[Claim 1]

A ship comprising:

a hull having a pair of broadsides;

a tank that is provided in the hull and is capable of

storing liquefied carbon dioxide; and

a loading pipe that loads liquefied carbon dioxide

that is supplied from an outside of the ship into the tank,

wherein the loading pipe includes

a transport pipe having a connection part for

connection with the outside of the ship,

an upper loading pipe that branches off and

extends from the transport pipe and is open to an upper

portion in the tank,

a lower loading pipe that branches off and

extends from the transport pipe and is open to a lower

portion in the tank,

a first on-off valve provided in the upper

loading pipe,

a second on-off valve provided in the lower

loading pipe,

a spray pipe that branches off from the transport

pipe to reach inside the tank and has a plurality of

injection holes disposed on a lower side with respect to an opening of the upper loading pipe and on an upper side with respect to an opening of the lower loading pipe, and an on-off valve provided in the spray pipe.
[Claim 2]

The ship according to claim 1, further comprising:

a control device that controls opening/closing

operations of the first on-off valve and the second on-off

valve, based on a liquid level of the liquefied carbon

dioxide in the tank, when the liquefied carbon dioxide is

loaded into the tank.
[Claim 3]

The ship according to claim 2, further comprising:

a liquid level detection unit that detects the liquid

level of the liquefied carbon dioxide that is stored in the

tank,

wherein the control device opens the first on-off

valve to load the liquefied carbon dioxide into the tank

through the upper loading pipe, and opens the second on-off

valve to load the liquefied carbon dioxide into the tank

through the lower loading pipe in a case where the liquid

level of the liquefied carbon dioxide that is detected by

the liquid level detection unit reaches a switching level

set to be higher than the opening of the lower loading pipe.
[Claim 4]

The ship according to claim 2 or 3, further comprising:

a pressure detection unit that detects a pressure of

the liquefied carbon dioxide in the loading pipe,

wherein the control device opens the first on-off

valve in a case where the pressure of the liquefied carbon

dioxide that is detected by the pressure detection unit

becomes equal to or lower than a reference pressure

determined in advance, in a state where the second on-off

valve is opened.
[Claim 5]

A method of loading liquefied carbon dioxide into the

ship according to any one of claims 1 to 4, the method

comprising:

a step of opening the on-off valve to inject the

liquefied carbon dioxide into the tank from the spray pipe;

a step of opening the first on-off valve to load the

liquefied carbon dioxide into the tank through the upper

loading pipe; and

a step of closing the first on-off valve and opening

the second on-off valve to load the liquefied carbon dioxide

into the tank through the lower loading pipe, after a liquid

level of the liquefied carbon dioxide in the tank has reached a switching level set to be higher than the opening of the lower loading pipe.