KR20230070023A - Transfer method of liquefied carbon dioxide, floating body - Google Patents

Abstract

The transfer method of liquefied carbon dioxide includes a step of connecting a connecting pipe for connecting to an external facility disposed outside the floating body to a pipe that communicates with the inside of a tank provided in the floating body, and a moisture content inside the connecting pipe and the pipe. A step of introducing a purge gas adjusted to the predetermined upper limit or less and replacing the inside of the connection pipe and piping with purge gas; a step of replacing the inside of the connecting pipe and piping with carbon dioxide gas from the purge gas; A process of transferring liquefied carbon dioxide between an external facility and a tank through pipes and piping is included.

Description

Transfer method of liquefied carbon dioxide, floating body

The present disclosure relates to a transfer method and floating body of liquefied carbon dioxide.

This application claims priority based on Japanese Patent Application No. 2020-180560 for which it applied to Japan on October 28, 2020, and uses the content here.

For example, in Patent Document 1, a transfer device (natural gas) for transferring liquefied gas from a ship (import ship) equipped with a tank for storing liquefied gas (LNG) to an onshore facility (import terminal). A configuration having a conveying device) is disclosed. In such a configuration, the ship moored at the facility on land is in fluid communication with the facility and transfers the liquefied gas in the tank to the storage tank on land.

Patent Document 1: Japanese Patent Publication No. 2010-503132

By the way, when loading liquefied gas into a tank from external facilities such as facilities on land, or when unloading liquefied gas in a tank to external facilities, piping such as loading piping and unloading piping provided in the tank is connected to the external facility. connected through However, when connecting the connection pipe to the pipe, there is a possibility that air (air) enters the inside of the pipe. And, when accommodating liquefied carbon dioxide in a tank, when air intrusion into a pipe occurs, moisture contained in the air reacts with carbon dioxide to produce carbonic acid and hydrate. When carbonic acid or hydrate is generated in this way, there is a possibility that corrosion occurs inside the pipe or tank.

Therefore, after connecting the connection pipe to the piping of the tank, filling the connection pipe with carbon dioxide gas is performed. This suppresses direct contact of moisture contained in the air with liquefied carbon dioxide. However, even in this case, when the carbon dioxide gas is filled, there is a possibility that moisture and carbon dioxide contained in the air in the connecting pipe react to cause corrosion inside the tank or the pipe.

The present disclosure has been made in order to solve the above problems, and is capable of suppressing the reaction between carbon dioxide and moisture when transferring liquefied carbon dioxide and suppressing the occurrence of corrosion inside a tank or piping. It aims at providing a transfer method and floating body.

In order to solve the above problem, a method for transferring liquefied carbon dioxide according to the present disclosure includes a step of connecting a connecting pipe, a step of replacing with a replacement gas, a step of replacing with carbon dioxide gas, and transferring the liquefied carbon dioxide. include the process In the step of connecting the connection pipe, the connection pipe is connected to a pipe that communicates with the inside of the tank provided in the floating body. The connection pipe is for connecting the pipe to an external facility disposed outside the floating body. In the step of purging with the purge gas, a purge gas is introduced into the connecting pipe and the inside of the pipe, and the inside of the connecting pipe and the pipe is replaced with the purge gas. The moisture content of the purge gas is adjusted to a predetermined upper limit value or less. In the step of substituting with carbon dioxide gas, the inside of the connection pipe and the pipe are replaced with carbon dioxide gas from the substitution gas. In the step of transferring the liquefied carbon dioxide, the liquefied carbon dioxide is transferred between the external equipment and the tank through the connection pipe and the piping.

A floating body according to the present disclosure includes a floating body main body, a tank, a pipe, a displacement gas supply unit, and a carbon dioxide supply unit. The tank is disposed on the floating body body. The tank can store liquefied carbon dioxide. The piping communicates with the inside of the tank. As for the said piping, the connection pipe for supplying liquefied carbon dioxide between external equipment and the said tank is connectable. The purge gas supply unit introduces purge gas into the inside of the pipe and the pipe when the connecting pipe is connected to the pipe. In the purge gas, the water content is adjusted to a predetermined upper limit value or less. The carbon dioxide supply unit introduces carbon dioxide gas into the inside of the pipe and the connection pipe.

According to the liquefied carbon dioxide transfer method and floating body of the present disclosure, when the liquefied carbon dioxide is transferred, the reaction between carbon dioxide and moisture can be suppressed, and corrosion can be suppressed from occurring inside the tank or pipe.

1 is a plan view showing a schematic configuration of a ship as a floating body according to an embodiment of the present disclosure.
Fig. 2 is a view showing a tank and piping provided in a ship according to an embodiment of the present disclosure, and is a cross-sectional view seen in the direction of arrow II in Fig. 1 .
Fig. 3 is a view showing tanks and piping provided in a ship according to an embodiment of the present disclosure, and is a cross-sectional view seen in the direction of arrow II-II in Fig. 1;
Fig. 4 is a diagram showing external equipment connected to a ship according to an embodiment of the present disclosure through connecting pipes.
5 is a flow chart showing the procedure of the loading method of liquefied carbon dioxide according to the embodiment of the present disclosure.
Fig. 6 is a diagram showing a step of connecting connecting pipes in the transfer method of liquefied carbon dioxide according to an embodiment of the present disclosure.
7 is a diagram showing a step of substituting with a purge gas in the transfer method of liquefied carbon dioxide according to an embodiment of the present disclosure.
8 is a diagram showing a step of replacing with carbon dioxide gas in the transfer method of liquefied carbon dioxide according to an embodiment of the present disclosure.
9 is a diagram showing a step of transferring liquefied carbon dioxide in the method of transferring liquefied carbon dioxide according to an embodiment of the present disclosure.

Hereinafter, a floating body and a transfer method of liquefied carbon dioxide according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 9 .

(Configuration of vessel)

As shown in FIGS. 1 and 2 , in the embodiment of the present disclosure, the ship 1 as a floating object transports liquefied carbon dioxide. This vessel 1 is provided with at least a hull 2 as a floating body body, a tank facility 10, a displacement gas supply unit 20 (see FIG. 2), and a carbon dioxide supply unit 30 (see FIG. 2). are doing

(hull configuration)

The hull 2 has a pair of sheath sides 3A and 3B, a ship bottom 4 (see Fig. 2), and an upper deck 5 forming the outer shell. The sheath sides 3A and 3B have a pair of sheath side shell plates respectively forming left and right sheath sides on both sides in the ship width direction Dw. The ship bottom 4 is disposed below in the vertical direction Dv and has a ship bottom shell plate connecting these side sides 3A and 3B. As shown in FIG. 2, by these pair of side sides 3A and 3B and the ship bottom 4, the outer shell of the hull 2 is in a cross section orthogonal to the fore and aft direction Da, It forms a U shape. The upper deck 5 illustrated in this embodiment is a traditional deck exposed to the outside. In the hull 2, on the upper deck 5 on the side of the stern 2b, an upper structure 7 having a residence is formed.

Inside the ship body 2, a cargo loading compartment (hold) 8 is formed on the bow 2a side rather than the superstructure 7. The cargo loading compartment 8 is recessed toward the bottom of the ship below the upper deck 5 and is open upward.

(Configuration of tank facilities)

A plurality of tank installations 10 are arranged in the cargo loading compartment 8 along the fore and aft direction Da. In the embodiment of the present disclosure, two tank facilities 10 are arranged at intervals in the fore and aft direction Da.

As shown in FIGS. 2 and 3 , the tank facility 10 includes at least a tank 11 and a pipe 12 .

In this embodiment, the tank 11 is disposed on the hull 2. The tank 11 has a cylindrical shape extending in the horizontal direction, for example. In this embodiment, the tank 11 is arranged so that its long axis direction is along the fore and aft direction Da. The tank 11 accommodates liquefied carbon dioxide (L) therein. In addition, the tank 11 is not limited to a cylindrical shape, and the tank 11 may be spherical, square, or the like.

The pipe 12 includes a loading pipe 13 and an unloading pipe 14 . That is, as the piping 12 of the tank facility 10, there are two types of loading piping 13 and unloading piping 14.

As shown in Fig. 3, the loading piping 13 carries liquefied carbon dioxide (L) supplied from an outboard external facility 100 (see Fig. 4) such as a land-based liquefied carbon dioxide supply facility into a tank 11. It forms a conduit for loading. Among the loading pipes 13, a part of the side closer to the end 13a penetrates the top of the tank 11 and extends from the outside of the tank 11 to the inside. A portion of the loading pipe 13 on the side close to one end 13a extends in the vertical direction Dv within the tank 11 . One end 13a of the loading pipe 13 is opened in the tank 11 at the bottom of the tank 11 .

The rest of the loading pipe 13, that is, the part on the side close to the other end 13b is disposed outside the tank 11. As shown in FIG. 2, the other end 13b of the loading pipe 13 is provided with a connection portion 13j with an outboard. The connection part 13j has a flange etc., for example. The connecting portion 13j is disposed facing one of the side sides 3A and 3B (for example, the side side 3A). The opening of the connecting portion 14j is normally closed by a cover (not shown). The connecting portion 13j separates the cover (not shown) to cover (not shown) an end portion of the connection pipe 50 for connection with the equipment-side tank 101 of the external equipment 100. ), it is possible to connect instead.

The unloading pipe 14 sends the liquefied carbon dioxide (L) in the tank 11 to the external equipment 100 outboard. A part of the side close to one end 14a of the discharge pipe 14 extends from the outside of the tank 11 through the top of the tank 11 to the inside of the tank 11 . One end 14a of the unloading pipe 14 is disposed in the middle lower portion of the tank 11 . A pump (not shown) is provided at one end 14a of the unloading pipe 14 . A pump (not shown) sucks in the liquefied carbon dioxide (L) in the tank 11 and sends it to the discharge pipe 14. The discharge pipe 14 guides the liquefied carbon dioxide (L) delivered from the pump to the outside of the tank 11 (outboard).

Among the unloading piping 14, the part on the side close to the other end 14b which is a remainder is arrange|positioned outside the tank 11. As shown in FIG. 2, the other end 14b of the lowering pipe 14 is provided with a connection portion 14j with an outboard. The connecting portion 14j has, for example, a flange, and is arranged facing one of the side sides 3A and 3B (for example, the side side 3A). The opening of the connecting portion 14j is normally closed by a cover (not shown). The connection part 14j connects the end of the connection pipe 50 for connection with the equipment-side tank 101 of the external equipment 100 instead of the cover (not shown) by removing this cover (not shown). it is possible to do

As shown in FIG. 4 , the connection pipe 50 is a facility-side tank 101 of the external facility 100 when loading liquefied carbon dioxide (L) into the tank 11 from the external facility 100. The connection part 13j of the facility side pipe 102 provided in and the loading pipe 13 is connected and communicated. In addition, the connection pipe 50 is a facility-side piping provided in the facility-side tank 101 of the external facility 100 when unloading liquefied carbon dioxide (L) from the tank 11 to the external facility 100 ( 102) and the connection part 14j of the unloading pipe 14 are connected and communicated. In the following description, except for the case where the loading piping 13 and the unloading piping 14 are distinguished, the loading piping 13 and the unloading piping 14 are simply referred to as the piping 12, and the connection portions 13j and 14j ) is simply referred to as a connecting portion 12j.

The pipe 12 and the facility-side pipe 102 on the external facility 100 side are provided with on-off valves 15 and 105, respectively. The on-off valve 15 opens and closes a flow path in the pipe 12 . The on-off valve 105 opens and closes a flow path in the facility-side piping 102 . In addition, an opening valve 106 is provided in the facility-side piping 102 . When the opening valve 106 is opened, the flow path in the facility-side piping 102 and the outside communicate with each other. When the on-off valves 15 and 105 are closed in a state where the facility-side piping 102 and the piping 12 are connected by the connecting pipe 50, there is a gap between the on-off valve 15 and the on-off valve 105. The inside of the pipe 12, the connecting pipe 50, and the facility-side pipe 102 are in a state where they are not communicated with the facility-side tank 101 or the tank 11. Here, the outside to which the flow path in the facility-side piping 102 communicates is not limited to the atmosphere. For example, a container such as a tank capable of storing gas released through the opening valve 106 may be used.

As shown in FIG. 2 , the substitution gas supply unit 20 is connected to the pipe 12 by connecting the connecting pipe 50 to the external equipment 100, and the pipe 12 and the connecting pipe 50 Inside, a substitution gas (Ga) is introduced. As the substitution gas Ga, a gas that does not cause a chemical reaction with carbon dioxide is used. In the substituted gas Ga, the water content is adjusted to a predetermined upper limit value or less. As such a substitution gas Ga, air whose water content is adjusted to a predetermined upper limit value or less (so-called dry air) or an inert gas such as nitrogen or argon can be used. In this embodiment, dry air is used as the purge gas Ga. The displacement gas supply unit 20 includes an air dryer 21 . The air dryer 21 generates dry air whose moisture content is adjusted to a predetermined upper limit value, for example, a dew point temperature of -40°C or lower, by removing moisture from the atmosphere sucked in from the outside. The air dryer 21 is connected to the pipe 12 via a replacement gas supply pipe 22 . An opening/closing valve 23 is provided in the purge gas supply pipe 22 . The dry air generated by the air dryer 21 passes through the displacement gas supply pipe 22 by opening the on-off valve 23, and passes through the pipe 12, the connection pipe 50, and the facility-side pipe 102. ) is introduced into the interior of In addition, the upper limit of the amount of moisture in dry air may be any value capable of efficiently removing moisture in the pipe, and can be determined in advance by experiments or the like.

As shown in FIGS. 2 and 4 , the carbon dioxide supply unit 30 is connected to the pipe 12 in the state where the connecting pipe 50 for connecting to the external equipment 100 is connected to the pipe 12, the connecting pipe (50), and carbon dioxide gas (Gc) is introduced into the facility-side piping 102. In this embodiment, the carbon dioxide supply unit 30 uses, as the carbon dioxide gas Gc, the boil-off gas generated by vaporizing the liquefied carbon dioxide L in the tank 11 . The carbon dioxide supply unit 30 includes a boil-off gas supply pipe 31 (see FIGS. 2 and 3 ). The boil-off gas supply pipe 31 communicates the gas phase in the upper part of the tank 11 with the pipe 12 . The carbon dioxide supply unit 30 introduces boil-off gas from the tank 11 through the pipe 12 to the inside of the connection pipe 50 and the facility-side pipe 102 .

(Procedure of transfer method of liquefied carbon dioxide)

As shown in FIG. 5 , the transfer method (S10) of the liquefied carbon dioxide (L) according to this embodiment includes a step (S11) of connecting the connecting pipe 50 and a step of substituting with a purge gas (Ga) ( S12), a step of replacing with carbon dioxide gas (Gc) (S13), and a step of transferring liquefied carbon dioxide (L) (S14).

In the process of connecting the connecting pipe 50 (S11), as shown in FIG. 6 , one end of the connecting pipe 50 for connecting to the external equipment 100 is connected to the pipe 12 . In addition, the other end of the connection pipe 50 is connected to the facility-side piping 102 of the external facility 100. At this time, the on-off valves 15, 23, 105 and the open valve 106 are left closed. In this state, air enters inside the piping 12, the connecting pipe 50, and the equipment-side piping 102 located between the on-off valve 15 and the on-off valve 105.

In step S12 of substituting with purge gas Ga, purge gas Ga is introduce|transduced into the inside of the connection pipe 50 by the purge gas supply part 20, as shown in FIG. For this, while operating the air dryer 21, the on-off valves 15 and 105 are closed, and the on-off valve 23 and the open valve 106 are opened. By removing moisture in the air (atmospheric air) sucked in from the outside by the air dryer 21, dry air whose moisture content is adjusted to a predetermined upper limit value or less is generated, and this dry air becomes the purge gas Ga. This purge gas Ga passes through the purge gas supply pipe 22 and is supplied to the connecting portion 12j of the pipe 12 . The supplied substitution gas Ga flows from the pipe 12 to the connection pipe 50 and the equipment side pipe 102, and the inside of the pipe 12, the connection pipe 50 and the equipment side pipe 102 Air is sequentially pushed out from the open valve 106. The dew point of the air discharged from the opening valve 106 is measured, and the transfer of the purge gas Ga is continued until the dew point falls within a preset tolerance range. When the measured dew point falls within the allowable range, the introduction of the purge gas Ga by the purge gas supply unit 20 is stopped, and the open valve 106 and the on-off valve 23 are closed. Thereby, the inside of the piping 12 between the on-off valves 15 and 105, the connecting pipe 50, and the facility-side piping 102 is substituted with the substitution gas Ga.

In step S13 of replacing with carbon dioxide gas (Gc), the inside of the connection pipe 50 is replaced with carbon dioxide gas (Gc) from the replacement gas (Ga). In this case, as shown in FIG. 8 , the on-off valves 15 and 105 are opened, and the open valve 106 and the on-off valve 23 are closed. In this state, the boil-off gas in the tank 11 passes through the carbon dioxide supply unit 30 and the pipe 12, and into the connection pipe 50 and the facility-side pipe 102, the carbon dioxide gas (Gc) introduced as As a result, the substitution gas Ga (dry air) inside the pipe 12, the connection pipe 50, and the facility-side pipe 102 is sequentially pushed out toward the external facility 100 side. On the external equipment 100 side, the carbon dioxide concentration of the mixed gas of the substituted gas Ga and the carbon dioxide gas Gc expelled from the connection pipe 50 side is measured. When the measured carbon dioxide concentration falls within a preset concentration range, supply of the carbon dioxide gas (Gc) by the carbon dioxide supply unit 30 is stopped.

In the process of transferring liquefied carbon dioxide (L) (S14), as shown in FIG. 9 , it passes through the connection pipe 50 and the pipe 12 and liquefies between the external equipment 100 and the tank 11. It transfers carbon dioxide (L). For example, when loading liquefied carbon dioxide (L) into the tank 11 from the external equipment 100, from the equipment side tank 101 of the external equipment 100, the equipment side piping 102, connection Liquefied carbon dioxide (L) is introduced into the tank 11 through the pipe 50 and the pipe 12 (loading pipe 13).

In the case of unloading the liquefied carbon dioxide (L) from the inside of the tank 11 to the external equipment 100, from the pipe 12 (the unloading pipe 14), the connection pipe 50 and the equipment-side pipe 102 ), and introduces liquefied carbon dioxide (L) into the facility-side tank 101 of the external facility 100.

(action effect)

According to the transfer method (S10) of the liquefied carbon dioxide of the above embodiment, after replacing the inside of the connection pipe 50 and the pipe 12 with the replacement gas Ga, the replacement is further performed with the carbon dioxide gas Gc. . In the substituted gas Ga, the water content is adjusted to a predetermined upper limit value or less. Thereby, when the substitution gas Ga is substituted with the carbon dioxide gas Gc, the reaction of the carbon dioxide gas Gc with moisture is suppressed. After replacing the inside of the connection pipe 50 and the pipe 12 with carbon dioxide gas (Gc), the liquefied carbon dioxide (L) transferred between the external facility 100 and the tank 11 is transferred to the connection pipe 50 ) and inside the pipe 12, the occurrence of the reaction between the carbon dioxide gas (Gc) and water is suppressed even at this time. Therefore, when the liquefied carbon dioxide (L) is transferred, it is possible to suppress the reaction between the carbon dioxide and moisture, and to suppress the occurrence of corrosion in the tank 11 or the inside of the pipe 12.

In addition, the substitution gas Ga is dry air whose moisture content is adjusted to a predetermined upper limit value or less. Dry air used as the substitution gas Ga can be generated by drying air (atmospheric air) with an air dryer 21 . Therefore, on the ship 1, it becomes possible to prepare dry air easily.

In addition, the carbon dioxide gas (Gc) is a boil-off gas generated when the liquefied carbon dioxide (L) stored in the tank 11 is vaporized. Thereby, on the ship 1, it becomes possible to obtain carbon dioxide gas (Gc) easily.

In the ship 1 of the above embodiment, when the connecting pipe 50 for connecting to the external equipment 100 is connected to the pipe 12, the purge gas supply unit 20 connects the connecting pipe 50 and the pipe. Inside (12), a substitution gas (Ga) whose moisture content is adjusted to a predetermined upper limit value or less is introduced. In this way, the inside of the connection pipe 50 and the pipe 12 can be substituted with the substitution gas Ga. Further, by introducing carbon dioxide gas (Gc) into the inside of the connecting pipe 50 and the piping 12 in the carbon dioxide supply unit 30, the inside of the connecting pipe 50 and the piping 12 is replaced with a substitution gas ( Ga) can be replaced with carbon dioxide gas (Gc). After that, when transferring the liquefied carbon dioxide (L) by passing through the connection pipe 50 and the pipe 12 and transferring the liquefied carbon dioxide (L) between the external equipment 100 and the tank 11 It is possible to suppress the reaction between carbon dioxide and water, thereby suppressing the occurrence of corrosion in the tank 11 or the inside of the pipe 12.

In addition, the ship 1 is equipped with an air dryer 21 . Thereby, by drying atmospheric air (air) sucked in from the outside with the air dryer 21, dry air whose moisture content is adjusted to a predetermined upper limit value or less can be provided as the replacement gas Ga. Thereby, on the ship 1, it becomes possible to obtain easily the substituted gas Ga whose moisture content was adjusted to the predetermined|prescribed upper limit value or less.

In addition, in the ship 1, the boil-off gas generated by vaporizing the liquefied carbon dioxide L stored in the tank 11 is used as the carbon dioxide gas Gc, and the introduced into the interior Thereby, on the ship 1, it becomes possible to obtain carbon dioxide gas (Gc) easily.

(Other embodiments)

As mentioned above, the embodiment of the present disclosure has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like within the range not departing from the gist of the present disclosure are included.

In addition, in the above embodiment, as the connection part 12j of the pipe 12, the connection part 13j of the loading pipe 13 and the connection part 14j of the unloading pipe 14 were provided separately, but limited to this It is not. For example, the loading pipe 13 and the unloading pipe 14 are connected to one pipe 12 from the other end 13b, 14b side, and the connection portion 12j is connected to the loading pipe 13 and the unloading pipe ( 14) may be shared.

Moreover, in the said embodiment, although liquefied carbon dioxide (L) was transferred between the ship 1 and the external installation 100 installed on land, it is not limited to this. You may make it transfer liquefied carbon dioxide (L) between the vessel 1 and the side floating body installation which is arrange|positioned on the side and is not equipped with a propulsion mechanism. In this case, the floating body equipment corresponds to the external equipment 100 as viewed from the vessel 1 .

In the above embodiment, as the carbon dioxide gas Gc, the boil-off gas generated by vaporizing the liquefied carbon dioxide L in the tank 11 is used, but the carbon dioxide gas Gc is other than the boil-off gas. , for example, carbon dioxide gas contained in another vessel on the same ship or outboard.

Moreover, although it was set as the structure provided with the two tanks 11 in the ship 1 of the said embodiment, the number of tanks 11 and arrangement|positioning are not limited to this. Three or more tanks 11 may be provided. Further, in the above embodiment, the case where the plurality of tanks 11 are arranged in a row in the fore and aft direction Da has been exemplified, but the tanks 11 are arranged in a row in the line width direction (in other words, the left and right side directions). You can do it. Moreover, in the said embodiment, although the ship 1 was illustrated as a floating body, it is not limited to this. The floating body may be a two-sided floating body facility not provided with a propulsion mechanism. When the floating body is a floating body facility, the external facility 100 viewed from the floating body facility may be a ship.

<Bookkeeping>

The transfer method (S10) of liquefied carbon dioxide (L) described in each embodiment and the floating body 1 are grasped as follows, for example.

(1) The transfer method (S10) of the liquefied carbon dioxide (L) according to the first aspect is to the pipe 12 communicating with the inside of the tank 11 provided in the floating body 1, of the floating body 1 Step (S11) of connecting the connection pipe 50 for connection with the external equipment 100 disposed outside, and the moisture content inside the connection pipe 50 and the pipe 12 is below a predetermined upper limit value. A step (S12) of introducing the adjusted purge gas (Ga) and substituting the inside of the connection pipe 50 and the pipe 12 with the purge gas Ga, and the connecting pipe 50 and the pipe Step (S13) of replacing the interior of (12) with carbon dioxide gas (Gc) from the substitution gas (Ga), and passing through the connection pipe (50) and the pipe (12), the external facility (100) ) and a step (S14) of transferring liquefied carbon dioxide (L) between the tank 11.

As an example of the floating body 1, a ship and a floating body installation are mentioned. As an example of the floating body body 2, the floating body body 2 of a hull or a floating body facility can be mentioned.

As an example of substitution gas Ga, dry air and an inert gas are mentioned, for example.

According to the transfer method (S10) of this liquefied carbon dioxide (L), after replacing the inside of the connection pipe 50 and the pipe 12 with the replacement gas (Ga), it is further replaced with the carbon dioxide gas (Gc). . Since the water content of the substituted gas Ga is adjusted to a predetermined upper limit or less, when the substituted gas Ga is replaced with the carbon dioxide gas Gc, the reaction of carbon dioxide with water is suppressed. After replacing the inside of the connection pipe 50 and the pipe 12 with carbon dioxide gas (Gc), the liquefied carbon dioxide (L) transferred between the external facility 100 and the tank 11 is transferred to the connection pipe 50 ) and inside the pipe 12, the occurrence of a reaction between carbon dioxide and water is also suppressed at this time. Therefore, when the liquefied carbon dioxide (L) is transferred, it is possible to suppress the reaction between the carbon dioxide and moisture, and to suppress the occurrence of corrosion in the tank 11 or the inside of the pipe 12.

(2) The liquefied carbon dioxide (L) transfer method (S10) according to the second aspect is the liquefied carbon dioxide (L) transfer method (S10) of (1), wherein the substituted gas (Ga) has a moisture content Dry air adjusted to a predetermined upper limit or less.

In this way, the dry air used as the substitution gas Ga can be generated by drying air (atmospheric air) with an air dryer. Therefore, on the floating body 1, it becomes possible to prepare dry air easily.

(3) The liquefied carbon dioxide (L) transfer method (S10) according to the third aspect is the liquefied carbon dioxide (L) transfer method (S10) of (1) or (2), wherein the carbon dioxide gas (Gc ) is a boil-off gas generated when the liquefied carbon dioxide (L) stored in the tank 11 is vaporized.

Thereby, on the floating body 1, it becomes possible to obtain carbon dioxide gas (Gc) easily.

(4) The floating body 1 according to the fourth aspect includes a floating body body 2, a tank 11 disposed on the floating body body 2 and capable of storing liquefied carbon dioxide (L), and the tank 11 ), and a pipe 12 to which a connecting pipe 50 for supplying liquefied carbon dioxide (L) between the external equipment 100 and the tank 11 is connectable, and the connecting pipe 50 When ) is connected to the pipe 12, a purge gas supply unit for introducing a purge gas Ga whose moisture content is adjusted to a predetermined upper limit or less into the pipe 12 and the connecting pipe 50 ( 20) and a carbon dioxide supply unit 30 for introducing carbon dioxide gas (Gc) into the pipe 12 and the connection pipe 50.

In such a floating body 1, the substitution gas Ga whose moisture content is adjusted to the inside of the connection pipe 50 and the pipe 12 is introduced from the substitution gas supply unit 20 to the inside of the connection pipe 50 and the pipe 12. (50) and the inside of the pipe 12 can be substituted with substitution gas (Ga). Further, by introducing carbon dioxide gas (Gc) into the inside of the connecting pipe 50 and the piping 12 in the carbon dioxide supply unit 30, the inside of the connecting pipe 50 and the piping 12 is replaced with a substitution gas ( Ga) can be replaced with carbon dioxide gas (Gc). After that, when transferring the liquefied carbon dioxide (L) by passing through the connection pipe 50 and the pipe 12 and transferring the liquefied carbon dioxide (L) between the external equipment 100 and the tank 11 It is possible to suppress the reaction between carbon dioxide and water, thereby suppressing the occurrence of corrosion in the tank 11 or the inside of the pipe 12.

(5) The floating body 1 according to the fifth aspect is the floating body 1 of (4), wherein the replacement gas supply unit 20 is an air dryer 21 that reduces moisture contained in the atmosphere sucked in from the outside. is provided.

In this way, by reducing the moisture contained in the atmosphere sucked in from the outside by the air dryer 21, dry air can be provided as the replacement gas Ga whose moisture content is adjusted to a predetermined upper limit value or less.

(6) The floating body 1 according to the sixth aspect is the floating body 1 of (4) or (5), and the carbon dioxide supply unit 30 is a liquid carbon dioxide stored in the tank 11 (L ) is introduced into the pipe 12 and the connecting pipe 50 as the carbon dioxide gas Gc.

Thus, by using the boil-off gas as the carbon dioxide gas (Gc), it becomes possible to easily obtain the carbon dioxide gas (Gc) on the floating body 1.

According to the liquefied carbon dioxide transfer method and floating body of the present disclosure, when the liquefied carbon dioxide is transferred, the reaction between carbon dioxide and moisture can be suppressed, and corrosion can be suppressed from occurring inside the tank or pipe.

One… ship (floating body)
2… hull (floating body)
2a... player
2b... stern
3A, 3B... side
4… bottom
5... upper deck
7... superstructure
8… cargo loading compartment
10... tank equipment
11... Tank
12... pipe
12j... connection
13... loading piping
13a... first
13b... other end
13j... connection
14... unloading pipe
14a... first
14b... other end
14j... connection
15... on/off valve
20... purge gas supply
21... air dryer
22... Displacement gas supply line
23... on/off valve
30... carbon dioxide supply
50... connector
100... external facilities
101... Facility-side tank
102... Facility-side piping
105... on/off valve
106... open valve
Ga... displacement gas
Gc... carbon dioxide gas
L... liquefied carbon dioxide

Claims (6)

A step of connecting a connecting pipe for connecting to an external facility disposed outside the floating body to a pipe communicating with the inside of the tank provided in the floating body;
A step of introducing a purge gas whose moisture content is adjusted to a predetermined upper limit value or less into the inside of the connecting pipe and the pipe, and replacing the inside of the connecting pipe and the pipe with the purge gas;
a step of substituting the interior of the connection pipe and the piping with carbon dioxide gas from the purge gas;
A method for transferring liquefied carbon dioxide including a step of transferring liquefied carbon dioxide between the external equipment and the tank through the connection pipe and the piping. The method of claim 1,
The displacement gas is dry air whose moisture content is adjusted to a predetermined upper limit or less. According to claim 1 or claim 2,
The method of transferring liquefied carbon dioxide, wherein the carbon dioxide gas is a boil-off gas generated by vaporizing the liquefied carbon dioxide stored in the tank. a floating body,
A tank disposed on the floating body body and capable of storing liquefied carbon dioxide;
A piping communicating within the tank and to which a connection pipe for supplying liquefied carbon dioxide between an external facility and the tank is connectable;
When the connection pipe is connected to the pipe, a purge gas supply unit for introducing a purge gas whose moisture content is adjusted to a predetermined upper limit value or less into the pipe and the pipe and into the pipe;
A floating body comprising a carbon dioxide supply unit for introducing carbon dioxide gas into the inside of the pipe and the connection pipe. The method of claim 4,
The displacement gas supply unit is provided with an air dryer for reducing moisture contained in the atmosphere sucked in from the outside. According to claim 4 or claim 5,
The floating body according to claim 1, wherein the carbon dioxide supply unit introduces a boil-off gas generated by vaporization of liquefied carbon dioxide stored in the tank into the inside of the pipe and the connection pipe as the carbon dioxide gas.

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