AU2020409191A1

AU2020409191A1 - Ship

Info

Publication number: AU2020409191A1
Application number: AU2020409191A
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: 2022-06-30
Also published as: EP4079622A4; WO2021124622A1; EP4079622B1; DK4079622T3; CN114787029B; CN114787029A; JP2021095066A; KR20220093241A; EP4079622A1; JP7377094B2

Abstract

A ship comprising: a ship body; a tank that is provided in the ship body and stores one of ammonia and carbon dioxide; a supply line through which the other of ammonia and carbon dioxide is supplied into the tank; a discharge line that discharges a gas mixture obtained by mixing one of ammonia and carbon dioxide stored in the tank with the other of ammonia and carbon dioxide supplied into the tank through the supply line when the other of ammonia and carbon dioxide is supplied into the tank through the supply line; and a water tank that is provided in the ship body, that stores water, and into which the gas mixture discharged from the discharge line is introduced.

Description

DESCRIPTION

Title of Invention

SHIP

Technical Field

[0001]

The present disclosure relates to a ship.

The present application claims priority with respect

to Japanese Patent Application No. 2019-228934 filed in

Japan on December 19, 2019, the content of which is

incorporated herein by reference.

Background Art

[00021

A liquefied gas carrier or the like is provided with

a liquefied gas storage tank. Such a tank may be filled

with an inert gas and then the inert gas in the tank may

be replaced with air or the like such that the liquefied

gas remaining in the tank does not come into contact with

oxygen when the tank is opened for maintenance or the like

(see, for example, PTL 1).

Citation List

Patent Literature

[00031

[PTL 1] Japanese Unexamined Patent Publication No.

2013-193653

Summary of Invention

Technical Problem

[0004]

By the way, the type of gas stored in the tank may

be switched in the liquefied gas storage tank. At this

time, a problem may arise due to contact between the

residual gas of a first gas stored in the tank before the

switching and a second gas stored in the tank after the

switching. Examples of the problem include solid

generation resulting from a chemical reaction between the

first gas and the second gas. In addition, the first gas

may be mixed with the second gas and the first gas may

remain in the tank after the switching. Accordingly, in a

case where the type of gas stored in the tank is switched,

as in the case of the inert gas of PTL 1, the second gas

needs to be loaded into the tank after the first gas in

the tank is replaced with the inert gas.

However, as for the method described above, it is

necessary to sequentially execute the steps of discharging

the first gas to the outside of the tank, performing

replacement with the inert gas or the like in the tank,

and loading the second gas into the tank in switching the

type of gas loaded into the tank. As a result, it takes

time and effort to switch the type of gas loaded into the tank. In addition, depending on the type of the residual gas in the tank, the residual gas cannot be directly released from the tank into the atmosphere, and it may take time and effort to treat the residual gas.

[00051

The present disclosure has been made in view of the

above, and an object of the present disclosure is to

provide a ship in which the type of gas loaded into a tank

can be switched with ease and speed.

Solution to Problem

[00061

In order to achieve the above object, a ship

according to the present disclosure includes: a hull; a

tank provided in the hull and storing either ammonia or

carbon dioxide; a supply line supplying the other of the

ammonia and the carbon dioxide into the tank; a discharge

line discharging, when the other of the ammonia and the

carbon dioxide is supplied into the tank through the

supply line, a mixed gas in which one of the ammonia and

the carbon dioxide stored in the tank and the other of the

ammonia and the carbon dioxide supplied into the tank by

the supply line are mixed; and a water tank provided in

the hull and storing water, the mixed gas discharged from

the discharge line being introduced into the water tank.

Advantageous Effects of Invention

[00071

According to the ship of the present disclosure, it

is possible to efficiently switch the type of gas loaded

into the tank and work can be facilitated and expedited.

Brief Description of Drawings

[00081

Fig. 1 is a plan view illustrating a schematic

configuration of a ship according to an embodiment of the

present disclosure.

Fig. 2 is a side cross-sectional view illustrating a

state where liquefied carbon dioxide is loaded in a tank

to which the ship according to the embodiment of the

present disclosure is applied.

Fig. 3 is a side cross-sectional view illustrating a

state where liquefied ammonia is loaded in the tank to

which the ship according to the embodiment of the present

disclosure is applied.

Fig. 4 is a side cross-sectional view illustrating a

state where ammonia gas remains in the tank with the

liquefied ammonia discharged in the ship according to the

embodiment of the present disclosure.

Fig. 5 is a side cross-sectional view illustrating a

state where the liquefied carbon dioxide is supplied to

the tank and a mixed gas is sent into a water tank in the

ship according to the embodiment of the present disclosure.

Fig. 6 is a side cross-sectional view illustrating a

state where carbon dioxide gas remains in the tank with

the liquefied carbon dioxide discharged in the ship

according to the embodiment of the present disclosure.

Fig. 7 is a side cross-sectional view illustrating a

state where the liquefied ammonia is supplied to the tank

and the mixed gas is sent into the water tank in the ship

according to the embodiment of the present disclosure.

Description of Embodiments

[00091

Hereinafter, a ship according to an embodiment of

the present disclosure will be described with reference to

Figs. 1 to 7.

(Configuration of Hull of Ship)

A ship 1 of the embodiment of the present disclosure

illustrated in Figs. 1 and 2 is capable of selectively

carrying, for example, liquefied carbon dioxide and

liquefied ammonia. The ship 1 includes at least a hull 2,

a tank 21, an upper supply line 32, a lower supply line 33

as a supply line, a discharge line 35, and a water tank 50.

[0010]

(Hull Configuration)

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

broadsides 3A and 3B, a ship bottom (not illustrated), and

a deck 5, which form the outer shell of the hull 2. The broadsides 3A and 3B are provided with a pair of broadside skins respectively forming the left and right broadsides.

The ship bottom (not illustrated) is provided with a ship

bottom skin connecting the broadsides 3A and 3B. By the

pair of broadsides 3A and 3B and the ship bottom (not

illustrated), the outer shell of the hull 2 has a U shape

in a cross section orthogonal to a ship stern direction Da.

The deck 5 exemplified in this embodiment is a whole deck

exposed to the outside. In the hull 2, an upper structure

7 having a living quarter is formed on the deck 5 on a

stern 2b side.

[0011]

In the hull 2, a cargo loading section (hold) 8 is

formed closer to a bow 2a side than the upper structure 7.

The cargo loading section 8 is recessed toward the ship

bottom (not illustrated) below the deck 5 and is open

upward.

[00121

(Tank Configuration)

A plurality of the tanks 21 are disposed in the

cargo loading section 8. In this embodiment, for example,

a total of seven tanks 21 are disposed in the cargo

loading section 8. The tank 21 is not limited in any

manner in terms of layout and installation number in the

cargo loading section 8. In this embodiment, each tank 21 has, for example, a cylindrical shape extending in the horizontal direction (specifically, ship stern direction).

The tank 21 is not limited to a cylindrical tank and may

be spherical.

[00131

(Supply Line Configuration)

As illustrated in Fig. 2, the upper supply line 32

and the lower supply line 33 are provided in each tank 21.

The upper supply line 32 reaches the inside of the

tank 21 from the outside of the tank 21. An opening

portion 32a opening to the upper portion in the tank 21 is

formed at the tip of the upper supply line 32. Here, the

upper portion in the tank means the region in the tank 21

that is on the side closer to the upper end of the tank 21

than the center of the tank 21 in the ship height

direction (that is, the up-down direction of the tank 21).

As an example, the portion can be the top of the tank 21.

The upper supply line 32 is provided with an opening

closing valve 32v. In addition, the discharge line 35 is

branch-connected to the upper supply line 32.

[00141

The lower supply line 33 reaches the inside of the

tank 21 from the outside of the tank 21. An opening

portion 33a opening to the lower portion in the tank 21 is

formed at the tip of the lower supply line 33. Here, the lower portion in the tank 21 means the region in the tank

21 that is on the side closer to the lower end of the tank

21 than the center of the tank 21 in the ship height

direction. As an example, the portion can be the bottom

portion of the tank 21. The lower supply line 33 is

provided with an opening-closing valve 33v.

[00151

(Discharge Line Configuration)

When the type of gas loaded into the tank 21 is

switched, the discharge line 35 discharges the gas stored

in the tank 21 and containing at least one of ammonia and

carbon dioxide to the outside of the tank 21. One end

side of the discharge line 35 branches from the upper

supply line 32. The discharge line 35 is provided with an

opening-closing valve 35v.

[00161

(Water Tank Configuration)

The water tank 50 is provided in the hull 2 (see Fig.

1). The water tank 50 may be, for example, a ballast tank

provided in the hull 2. Water W can be stored in the

water tank 50. The water W stored in the water tank 50

may be seawater. The other end of the discharge line 35

is disposed in the water tank 50. As a result, the gas

discharged from the tank 21 through the discharge line 35

is introduced into the water W in the water tank 50.

[00171

The water tank 50 exemplified in this embodiment is

provided with a heating unit 52. The heating unit 52 is

configured to be capable of heating the water W in the

water tank 50. For example, the component (carbon dioxide

or ammonia) contained in the gas discharged from the tank

may cause a chemical reaction via the water W and a

substance resulting from the chemical reaction (for

example, ammonium carbonate) may be dissolved in the water

W in the water tank 50. In this case, it is possible to

perform separation into the components before the chemical

reaction (carbon dioxide, ammonia, and water) by the

heating unit 52 heating the water W in the water tank 50.

[00181

Further, a separated gas discharge line 53 is

connected to the water tank 50 exemplified in this

embodiment. By the separated gas discharge line 53, the

gas containing the above components separated by the

heating unit 52 can be discharged to the outside of the

ship.

[0019]

(Liquefied Gas Loading into and Discharge from Tank)

Either liquefied carbon dioxide Lc or liquefied

ammonia La is selectively loaded into the tank 21.

In a case where the ship 1 repeatedly carries only one of the liquefied carbon dioxide Lc and the liquefied ammonia La, liquefied carbon dioxide loading into the tank

21 or liquefied ammonia loading into the tank 21 is

performed as follows.

[00201

(Liquefied Carbon Dioxide Loading into Tank)

As illustrated in Fig. 2, in order to load the

liquefied carbon dioxide Lc into the tank 21, a pipe (not

illustrated) for supplying the liquefied carbon dioxide Lc

from an outboard liquefied carbon dioxide supply facility

or the like is connected to the lower supply line 33. The

opening-closing valve 33v is opened, and the liquefied

carbon dioxide Lc is sent from the outside of the ship

into the lower supply line 33. Then, the liquefied carbon

dioxide Lc is loaded into the tank 21 from the opening

portion 33a. In this manner, the liquefied carbon dioxide

Lc is stored in the tank 21. In addition, carbon dioxide

gas Gc resulting from partial vaporization of the

liquefied carbon dioxide Lc is in the upper portion in the

tank 21. The liquefied carbon dioxide Lc may be loaded

into the tank 21 through the upper supply line 32 with the

opening-closing valve 32v open.

[00211

(Liquefied Ammonia Loading into Tank)

As illustrated in Fig. 3, in order to load the liquefied ammonia La into the tank 21, a pipe (not illustrated) for supplying the liquefied ammonia La from an outboard liquefied ammonia supply facility or the like is connected to the lower supply line 33. The opening closing valve 33v is opened, and the liquefied ammonia La is sent from the outside of the ship into the lower supply line 33. Then, the liquefied ammonia La is loaded into the tank 21 from the opening portion 33a. In this manner, the liquefied ammonia La is stored in the tank 21. In addition, ammonia gas Ga resulting from partial vaporization of the liquefied ammonia La is in the upper portion in the tank 21. The liquefied ammonia La may be loaded into the tank 21 through the upper supply line 32 with the opening-closing valve 32v open.

[00221

(Gas Replacement from Liquefied Ammonia to Liquefied

Carbon Dioxide)

In the case of liquefied ammonia-to-liquefied carbon

dioxide replacement of the liquefied gas loaded into the

tank 21, first, the liquefied ammonia La in the tank 21 is

discharged to an outboard liquefied ammonia recovery

facility or the like. In order to discharge the liquefied

ammonia La stored in the tank 21, the opening-closing

valve 33v is opened and the liquefied ammonia La is

suctioned out of the tank 21 through the lower supply line

33 by, for example, a cargo pump (not illustrated). As a

result, the liquefied ammonia La in the tank 21 is

discharged to the outboard liquefied ammonia recovery

facility or the like through the lower supply line 33.

After the liquefied ammonia La in the tank 21 is

discharged, the ammonia gas Ga remains in the tank 21 as

illustrated in Fig. 4.

[00231

Subsequently, as illustrated in Fig. 5, the

liquefied carbon dioxide Lc is supplied to the lower

portion of the tank 21. In order to supply the liquefied

carbon dioxide Lc to the tank 21, the opening-closing

valve 33v is opened and the liquefied carbon dioxide Lc is

sent into the lower supply line 33 from the outside of the

ship. The liquefied carbon dioxide Lc is loaded into the

tank 21 from the opening portion 33a. The liquefied

carbon dioxide Lc is higher in specific gravity than the

ammonia gas Ga in the tank 21. Accordingly, the liquefied

carbon dioxide Lc sent into the tank 21 is stored in the

lower portion of the tank 21. The ammonia gas Ga is

stored above the liquefied ammonia La in the tank 21. In

addition, the carbon dioxide gas Gc generated by the

liquefied carbon dioxide Lc vaporizing also accumulates in

the upper portion of the tank 21. In other words, when

the liquefied carbon dioxide Lc is supplied into the tank

21, mixed gas Gm of the ammonia gas Ga and the carbon

dioxide gas Gc is stored in the upper portion of the tank

21.

[00241

When the liquefied carbon dioxide Lc is sent into

the tank 21 as described above, the opening-closing valve

v provided on the discharge line 35 is opened. When the

liquefied carbon dioxide Lc continues to be supplied to

the lower portion of the tank 21, the mixed gas Gm of the

ammonia gas Ga and the carbon dioxide gas Gc in the upper

portion of the tank 21 is pushed upward in the tank 21 as

the amount of the liquefied carbon dioxide Lc in the tank

21 increases. After the push, the mixed gas Gm flows into

the upper supply line 32 from the opening portion 32a open

in the upper portion in the tank 21. After flowing into

the upper supply line 32, the mixed gas Gm is introduced

into the water W in the water tank 50 through the

discharge line 35.

[00251

Then, ammonia (NH3 ) and carbon dioxide (C02), which

are components contained in the mixed gas Gm, are released

into the water W and cause a chemical reaction via the

water W (H20) . Then, solid ammonium carbonate ( (NH4)2CO3)

or ammonium bicarbonate (NH 4 HCO 3 ) is generated as a result

of the chemical reaction. The generated ammonium carbonate or ammonium bicarbonate is stored in the water tank 50 in a state of being dissolved in the water W.

[00261

If not the mixed gas Gm but only the ammonia gas Ga

is discharged from the upper portion of the tank 21 to the

upper supply line 32 in the initial stage in which the

liquefied carbon dioxide Lc is sent into the tank 21, the

ammonia gas Ga may be recovered, without being sent into

the water tank 50, through the upper supply line 32 by an

ammonia gas recovery facility or the like provided outside

the ship.

[00271

The opening-closing valves 33v and 35v are closed

when a predetermined amount of the liquefied carbon

dioxide Lc is stored in the tank 21. As a result, the

work of replacing the liquefied gas loaded into the tank

21 from the liquefied ammonia La to the liquefied carbon

dioxide Lc is completed.

[00281

(Gas Replacement from Liquefied Carbon Dioxide to

Liquefied Ammonia)

In the case of liquefied carbon dioxide-to-liquefied

ammonia replacement of the liquefied gas loaded into the

tank 21, first, the liquefied carbon dioxide Lc in the

tank 21 is discharged to an outboard liquefied carbon dioxide recovery facility or the like. In order to discharge the liquefied carbon dioxide Lc stored in the tank 21, the opening-closing valve 33v is opened and the liquefied carbon dioxide Lc is suctioned out of the tank

21 through the lower supply line 33 by, for example, a

cargo pump (not illustrated). As a result, the liquefied

carbon dioxide Lc in the tank 21 is discharged to the

outboard liquefied carbon dioxide recovery facility or the

like through the lower supply line 33.

After the liquefied carbon dioxide Lc in the tank 21

is discharged, the carbon dioxide gas Gc remains in the

tank 21 as illustrated in Fig. 6.

[00291

Subsequently, as illustrated in Fig. 7, the

liquefied ammonia La is supplied to the lower portion of

the tank 21. In order to supply the liquefied ammonia La

to the tank 21, the opening-closing valve 33v is opened

and the liquefied ammonia La is sent into the lower supply

line 33 from the outside of the ship. Then, the liquefied

ammonia La is loaded into the tank 21 from the opening

portion 33a.

[00301

The liquefied ammonia La is higher in specific

gravity than the carbon dioxide gas Gc in the tank 21.

Accordingly, the liquefied ammonia La sent into the tank

21 is stored in the lower portion of the tank 21. The

carbon dioxide gas Gc is stored above the liquefied carbon

dioxide Lc in the tank 21. In addition, the ammonia gas

Ga generated by the liquefied ammonia La vaporizing also

accumulates in the upper portion of the tank 21. In other

words, when the liquefied ammonia La is supplied into the

tank 21, the mixed gas Gm of the carbon dioxide gas Gc and

the ammonia gas Ga is stored in the upper portion of the

tank 21.

[00311

When the liquefied ammonia La is sent into the tank

21 as described above, the opening-closing valve 35v

provided on the discharge line 35 is opened. When the

liquefied ammonia La continues to be supplied to the lower

portion of the tank 21, the mixed gas Gm of the carbon

dioxide gas Gc and the ammonia gas Ga in the upper portion

of the tank 21 is pushed upward in the tank 21 as the

amount of the liquefied ammonia La in the tank 21

increases. After the push, the mixed gas Gm flows into

the upper supply line 32 from the opening portion 32a open

in the upper portion in the tank 21. After flowing into

the upper supply line 32, the mixed gas Gm is introduced

into the water W in the water tank 50 through the

discharge line 35.

[00321

Then, ammonia (NH3 ) and carbon dioxide (C02), which

are components contained in the mixed gas Gm, are released

into the water W and cause a chemical reaction via the

water W (H20) . Then, solid ammonium carbonate ( (NH 4 ) 2 CO3

) or ammonium bicarbonate (NH 4 HCO3) is generated as a result

of the chemical reaction. The generated ammonium

carbonate or ammonium bicarbonate is stored in the water

tank 50 in a state of being dissolved in the water W.

[00331

If not the mixed gas Gm but only the carbon dioxide

gas Gc is discharged from the upper portion of the tank 21

to the upper supply line 32 in the initial stage in which

the liquefied ammonia La is sent into the tank 21, the

carbon dioxide gas Gc may be recovered as it is by, for

example, a carbon dioxide recovery facility provided

outside the ship or may be released to the outside of the

ship without being sent into the water tank 50.

[0034]

The opening-closing valves 33v and 35v are closed

when a predetermined amount of the liquefied carbon

dioxide Lc is stored in the tank 21. As a result, the

liquefied gas loaded into the tank 21 can be replaced from

the liquefied carbon dioxide Lc to the liquefied ammonia

La.

[00351

(Pyrolysis Treatment of Water in Water Tank)

As described above, the water W in the water tank 50

can be pyrolyzed by operating the heating unit 52. The

ammonium carbonate- or ammonium bicarbonate-dissolved

water W is heated when the heating unit 52 is operated.

When the water W in the water tank 50 is heated to, for

example, 580C or higher, the ammonium carbonate or

ammonium bicarbonate is pyrolyzed into ammonia, carbon

dioxide, and the water W. These pyrolyzed ammonia and

carbon dioxide are discharged to, for example, a treatment

facility provided outside the ship through the separated

gas discharge line 53 or the like.

[00361

(Action and Effect)

The ship 1 of the above embodiment includes the tank

21 where one of the ammonia gas Ga and the carbon dioxide

gas Gc remains (is stored), the lower supply line 33

supplying the other of the liquefied ammonia La and the

liquefied carbon dioxide Lc into the tank 21, the

discharge line 35 discharging the mixed gas of the ammonia

gas Ga or the carbon dioxide gas Gc that remains in the

tank 21 and the gas vaporized from the other of the

liquefied ammonia La and the liquefied carbon dioxide Lc

when the other of the liquefied ammonia La and the

liquefied carbon dioxide Lc is supplied from the lower supply line 33, and the water tank 50 into which the mixed gas discharged from the discharge line 35 is introduced.

[00371

In such a configuration, when the other of the

liquefied ammonia La and the liquefied carbon dioxide Lc

is supplied through the lower supply line 33 into the tank

21 where one of the ammonia gas Ga and the carbon dioxide

gas Gc remains, the mixed gas in which ammonia and carbon

dioxide are mixed is discharged from the tank 21. This

mixed gas is introduced into the water tank 50 through the

discharge line 35 and released into the water W. Then, a

chemical reaction occurs as a result of ammonia-carbon

dioxide-water contact in the tank 21, and ammonium

carbonate or ammonium bicarbonate is generated. The

ammonium carbonate or ammonium bicarbonate is dissolved in

the water W and stored. Accordingly, there is no need to

discharge the gas or product discharged from the tank 21

in the event of gas type switch to the outside of the ship.

In other words, gas type switch can be performed even in a

case where it is difficult to release the gas discharged

from the tank 21 into the atmosphere. As a result, it is

possible to efficiently switch the type of gas loaded into

the tank 21 and gas type switch can be facilitated and

expedited.

[00381

The ship 1 of the above embodiment further includes

the heating unit 52 heating the water W in the water tank

and the separated gas discharge line 53 discharging the

gas separated from the water W by the heating unit 52

heating the water W.

In such a configuration, in the event of gas type

switch, the water W in the water tank 50 in which the

product of a mixed gas-water chemical reaction is

dissolved can be heated by the heating unit 52.

Accordingly, the ammonium carbonate or ammonium

bicarbonate dissolved in the water W can be pyrolyzed to

separate the gas such as carbon dioxide gas and ammonia

gas from the water W. The gas separated from the water W

in the water tank 50 can be discharged from the separated

gas discharge line 53. Accordingly, the gas separated

from the water W can be treated at an appropriate timing

regardless of, for example, the situation of gas type

switch.

[00391

(Other Embodiments)

Although an embodiment of the present disclosure has

been described in detail with reference to the drawings,

the specific configuration is not limited to this

embodiment and also includes, for example, design changes

within the gist of the present disclosure.

Although the water tank 50 is provided with the

heating unit 52 in the above embodiment, the heating unit

52 may be provided in an outboard treatment facility or

the like. In that case, the water W in the water tank 50

is discharged to the outside of the ship with the

component and product contained in the gas discharged from

the discharge line 35 dissolved and is treated at the

outboard treatment facility or the like.

Exemplified in the above embodiment is a case where

the discharge line 35 is branch-connected to the upper

supply line 32. Alternatively, the discharge line 35 may

be directly connected to the tank 21 with the upper supply

line 32 omitted.

Described in the above embodiment is a case where

the liquefied ammonia La or the liquefied carbon dioxide

Lc is supplied into the tank 21 from the lower portion of

the tank 21 by the lower supply line 33. Alternatively,

the liquefied ammonia La or the liquefied carbon dioxide

Lc may be supplied into the tank 21 from, for example, the

upper portion or center of the tank 21 instead of the

lower portion.

[0040]

The ship 1 described in the embodiment is, for

example, grasped as follows.

[00411

(1) A ship 1 according to a first aspect includes: a

hull 2; a tank 21 provided in the hull 2 and storing

either ammonia or carbon dioxide; a supply line 33

supplying the other of the ammonia and the carbon dioxide

into the tank 21; a discharge line 35 discharging, when

the other of the ammonia and the carbon dioxide is

supplied into the tank 21 through the supply line 33, a

mixed gas in which one of the ammonia and the carbon

dioxide stored in the tank 21 and the other of the ammonia

and the carbon dioxide supplied into the tank 21 by the

supply line 33 are mixed; and a water tank 50 provided in

the hull 2 and storing water W, the mixed gas discharged

from the discharge line 35 being introduced into the water

tank 50.

[00421

As for the ship 1, in a case where the type of gas

loaded into the tank 21 is switched, the other of ammonia

and carbon dioxide is supplied through the supply line 33

into the tank 21 in which one of ammonia and carbon

dioxide is stored. Then, the mixed gas of ammonia and

carbon dioxide is discharged from the discharge line 35.

The mixed gas discharged from the tank 21 is sent into the

water tank 50 through the discharge line 35. As a result

of contact between the mixed gas sent into the tank 21 and the water W, ammonium carbonate or ammonium bicarbonate as an example is generated as a product. This product dissolves in the water W by being introduced into the water tank 50.

In this manner, when the type of gas loaded into the

tank 21 is switched, the mixed gas discharged from the

tank 21 is allowed to chemically react with the water W

and can be stored in the water tank 50. Accordingly,

there is no need to discharge the gas or product

discharged from the tank 21 in the event of gas type

switch to the outside of the ship. In other words, gas

type switch can be performed even in a case where it is

difficult to release the gas discharged from the tank 21

into the atmosphere. As a result, it is possible to

efficiently switch the type of gas loaded into the tank 21

and gas type switch can be facilitated and expedited.

[00431

(2) The ship 1 according to a second aspect, which

is the ship 1 of (1), further includes a heating unit 52

heating the water W in the water tank 50; and a separated

gas discharge line 53 discharging a gas separated from the

water W by the heating unit 52 heating the water W.

[0044]

As a result, the water W in the water tank 50 in

which the product is dissolved can be heated. Accordingly, the ammonium carbonate or ammonium bicarbonate dissolved in the water W can be pyrolyzed to separate the gas such as carbon dioxide gas and ammonia gas from the water W.

In addition, the gas separated from the water W in the

water tank 50 can be discharged from the separated gas

discharge line 53. Accordingly, the gas separated from

the water W can be treated at an appropriate timing

regardless of, for example, the situation of switching the

type of gas in the tank 21.

Industrial Applicability

[00451

According to the ship of the present disclosure, it

is possible to efficiently switch the type of gas loaded

into the tank and work can be facilitated and expedited.

Reference Signs List

[00461

1: ship

2: hull

2a: bow

2b: stern

3A, 3B: side

5: deck

7: upper structure

8: cargo loading section

21: tank

32: upper supply line

32a: opening portion

32v: opening-closing valve

33: supply line

33: lower supply line (supply line)

33a: opening portion

33v: opening-closing valve

: discharge line

v: opening-closing valve

: water tank

52: heating unit

53: separated gas discharge line

Da: ship stern direction

Ga: ammonia gas

Gc: carbon dioxide gas

Gm: mixed gas

La: liquefied ammonia

Lc: liquefied carbon dioxide

W: water

Claims

Claims

[Claim 1]

A ship comprising:

a hull;

a tank provided in the hull and storing either

ammonia or carbon dioxide;

a supply line supplying the other of the ammonia and

the carbon dioxide into the tank;

a discharge line discharging, when the other of the

ammonia and the carbon dioxide is supplied into the tank

through the supply line, a mixed gas in which one of the

ammonia and the carbon dioxide stored in the tank and the

other of the ammonia and the carbon dioxide supplied into

the tank by the supply line are mixed; and

a water tank provided in the hull and storing water,

the mixed gas discharged from the discharge line being

introduced into the water tank.
[Claim 2]

The ship according to Claim 1, further comprising:

a heating unit heating the water in the water tank;

and

a separated gas discharge line discharging a gas

separated from the water by the heating unit heating the water.