KR102469960B1 - Bunkering Vessel - Google Patents

Abstract

The present invention is a method for operating a bunkering ship including a bunkering tank for storing liquefied gas. decompressing; and (2) a bunkering step of supplying the liquefied gas stored in the bunkering tank to the liquefied gas storage tank, wherein the bunkering ship is may be supplied and injected into the liquid liquefied gas stored in the bunkering tank.

Description

Bunkering Vessel {Bunkering Vessel}

The present invention relates to a bunkering ship and a method of operating the bunkering ship.

Recently, as environmental regulations are strengthened, the use of liquefied natural gas (Liquefied Natural Gas), which is close to eco-friendly fuel, among various fuels is increasing. Liquefied natural gas is generally transported through an LNG carrier. At this time, the liquefied natural gas can be stored in a tank of an LNG carrier in a liquid state by lowering the temperature to -162 ° C or less under 1 atm. When liquefied natural gas is in a liquid state, its volume is reduced to 1/600 compared to its gaseous state, so the transport efficiency can be increased.

Terminals can be used when the distance from the source of liquefied natural gas to the place of consumption is long, and bunkering ships can receive liquefied natural gas from liquefied gas sources such as terminals and redistribute it to ships that transport or use liquefied natural gas as fuel. have. Unlike the conventional diesel fuel bunkering process, when loading or unloading the liquefied natural gas, the liquefied natural gas must be maintained at a cryogenic temperature. However, despite handling liquefied natural gas at a cryogenic temperature, a large amount of evaporation gas may be generated during loading or unloading of liquefied natural gas. Temperature and pressure must be controlled.

Recently, continuous research and development on bunkering technology for maintaining liquefied natural gas in a liquid state and supplying it to liquefied natural gas carriers or propulsion ships and ships using the same have been conducted, and higher bunkering efficiency and evaporation gas generated during the bunkering process have been conducted. A study on the treatment method is being conducted.

An object of the present invention is to provide a bunkering ship capable of loading and unloading liquefied gas in a liquefied gas storage tank for bunkering.

In addition, an object of the present invention is to provide a bunkering ship capable of treating gas generated in a bunkering preparation step and a bunkering step using a bunkering tank, which is a cargo tank of a bunkering ship.

One aspect of the present invention is a method of operating a bunkering ship including a bunkering tank for storing liquefied gas, (1) supplying gas inside a liquefied gas storage tank to a bunkering target to a gas combustion unit of the bunkering ship to obtain the liquefied gas Depressurizing the storage tank and (2) bunkering step of supplying the liquefied gas stored in the bunkering tank to the liquefied gas storage tank, wherein the bunkering ship is It may be to receive the boil-off gas generated from the inside and inject it into the liquefied gas stored in the bunkering tank.

Specifically, the bunkering ship pressurizes the liquefied gas supplied from the bunkering tank with an HD compressor and pressurizes the liquefied gas supplied from the first fuel supply line and the bunkering tank for supplying the gas to the gas combustion unit with an LD compressor. A second fuel supply line supplied to the power generation engine of the bunkering ship may be further included, and in step (1), the gas inside the liquefied gas storage tank to be bunkered may be supplied to the first fuel supply line.

Specifically, the bunkering ship further includes a gas injection line connected to the first fuel supply line and the second fuel supply line, respectively, and connected to the bunkering tank, and in step (2), the liquefied gas At least a portion of the boil-off gas generated in the storage tank may be supplied to the bunkering tank by sequentially flowing through the first fuel supply line or the second fuel supply line and the gas injection line.

Specifically, in the step (2), at least a portion of the boil-off gas generated in the liquefied gas storage tank is sequentially flowed through the second fuel supply line and the gas injection line and supplied to the bunkering tank, and the bunkering At least a part of boil-off gas generated in the tank may be supplied to the power generation engine by flowing it through the second fuel supply line.

Specifically, the gas injection line may be connected downstream of the HD compressor of the first fuel supply line and downstream of the LD compressor of the second fuel supply line, respectively.

The bunkering vessel according to the present invention can load and unload cryogenic liquefied gas into a liquefied gas storage tank for bunkering.

In addition, the bunkering ship according to the present invention supplies the boil-off gas generated from the bunkering ship or the boil-off gas generated from the bunkering target to the bunkering tank of the bunkering ship to condense and treat it, thereby reducing the installation cost of a separate device for re-liquefying the boil-off gas and can save space.

In addition, the bunkering ship according to the present invention controls the internal environment of the liquefied gas storage tank to be bunkered prior to loading to an environment suitable for loading the liquefied gas, thereby reducing the flow rate of boil-off gas generated in the liquefied gas storage tank during bunkering. can

1 is a conceptual diagram of a bunkering system for a bunkering ship according to an embodiment of the present invention.
2 is a conceptual diagram illustrating a process of loading liquefied gas to a bunkering ship according to an embodiment of the present invention.
3 is a conceptual diagram illustrating a process in which a bunkering ship receives boil-off gas from a bunkering target and condenses it according to an embodiment of the present invention.
4 is a conceptual diagram illustrating a case in which only one bunkering tank is used in the condensation process of FIG. 3 .
5 is a conceptual diagram illustrating a gassing-up process of supplying liquefied gas to a bunkering target in a bunkering ship according to an embodiment of the present invention.
6 is a conceptual diagram illustrating a cool-down process of supplying liquefied gas to a bunkering target in a bunkering ship according to an embodiment of the present invention.
7 is a conceptual diagram illustrating a process in which a bunkering ship depressurizes a liquefied gas storage tank to be bunkered according to an embodiment of the present invention.
8 is a conceptual diagram illustrating a process in which a bunkering ship loads liquefied gas into a bunkering target according to an embodiment of the present invention.

Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In adding reference numerals to components of each drawing in this specification, it should be noted that the same components have the same numbers as much as possible, even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

Hereinafter, high pressure (HP: high pressure), low pressure (LP: low pressure), high temperature and low temperature are relative, do not represent absolute values, and can be used relatively according to each embodiment of the present invention. Note that.

Hereinafter, bunkering is meant to encompass loading for supplying liquefied gas to a target from a bunkering ship and unloading for supplying liquefied gas to a bunkering ship by withdrawing the liquefied gas from the target. Bunkering ships receive liquefied gas supply from liquefied gas suppliers such as terminals, platforms, ports, and other bunkering ships, and can load and unload them into liquefied gas storage tanks for bunkering. it means.

Hereinafter, it is noted that the bunkering target is used to encompass all offshore plants such as FSRUs and FPSOs in addition to liquefied gas carriers that transport liquefied gas as cargo and liquefied gas propulsion ships that can use liquefied gas as fuel. In addition, the bunkering target may include other bunkering ships and liquefied gas transport vehicles having liquefied gas storage tanks. However, in a specific embodiment of the present invention, the target may be limited to any one or more of the above.

Hereinafter, liquefied gas may be used as a meaning encompassing all gaseous fuels generally stored in a low-temperature liquid state, such as LNG, LPG, ethylene, and ammonia. However, in the following embodiments and drawings, the liquefied gas will be described as an example of liquefied natural gas.

Hereinafter, boil off gas (BOG) may mean a gaseous liquefied gas as a natural or forcibly vaporized liquefied gas. However, boil-off gas may be used in the sense of including liquefied boil-off gas as well as gaseous boil-off gas. In addition, it should be noted that liquefied gas may be used as a term encompassing both a liquid state and a naturally vaporized or forcibly vaporized gas state.

Hereinafter, expressions such as first and second are intended to refer to a plurality of specific components provided in the present invention, and each expression may refer to any one of a plurality of components.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram showing a bunkering system as an internal system of a bunkering ship according to an embodiment of the present invention.

Referring to FIG. 1, the bunkering ship includes a bunkering tank 10, a manifold 20, an HD compressor 30, an LD compressor 40, a first liquid transfer line L10, and a second liquid transfer line L12. , gas phase transfer line (L20), first fuel supply line (L21), second fuel supply line (L23), gas processing line (L30) and the like. Hereinafter, although not shown, each line may include a valve for controlling the flow rate of the fluid flowing through the corresponding line.

The bunkering tank 10 is a storage tank mounted inside a bunkering ship to store liquefied gas for loading and unloading into a liquefied gas storage tank (not shown) for bunkering, and may be a cargo tank of a bunkering ship. The bunkering tank 10 may be a membrane tank having a membrane-type insulation structure suitable for storing cryogenic liquefied gas, but is not limited thereto, and liquefied gas, boil-off gas generated by natural evaporation of liquefied gas, or injected from the outside It may also be a pressure tank capable of withstanding the pressure of liquefied gas.

A plurality of bunkering tanks 10 may be provided inside the bunkering ship. For example, the bunkering tank 10 may be provided side by side along the stern from the bow of the ship, or may be provided side by side on the port and starboard sides of the ship. As shown in FIG. 1, the first bunkering tank 10a and the second bunkering tank 10b may be provided side by side.

The bunkering tank 10 may be connected to a manifold 20 to be described later to supply liquefied gas stored therein to a bunkering target through the manifold 20 or to receive liquefied gas from a bunkering target. When a plurality of bunkering tanks 10 are provided, each of the bunkering tanks 10a and 10b includes a first liquid transfer line L10, a liquid return line L11, a second liquid transfer line L12, and a gas injection line (L13) and gas phase transfer line (L20), etc. may be connected.

The first liquid transfer line L10 is a line having one end connected to the bunkering tank 10 and the other end connected to the manifold 20 to allow liquid liquefied gas to flow. The first liquid transfer line (L10) has one end extending to the bottom of the inside of the bunkering tank 10 and connected to the first pump 11, and the other end to be connected to the liquid manifolds (L, 21) of the manifold 20 can The bunkering ship withdraws the liquid liquefied gas stored in the bunkering tank 10 using the first pump 11, transfers it through the first liquid transfer line L10, and transfers it through the liquid manifold 21 to the bunkering target. Liquefied gas can be supplied to the liquefied gas storage tank.

Although not shown, the first pump 11 may be provided at the bottom of a pump tower disposed inside the bunkering tank 10, and may be installed to be submerged in liquid liquefied gas stored in the bunkering tank 10 . The first pump 11 may be installed to be spaced apart from the inner bottom surface of the bunkering tank 10, and may be provided in plurality.

The first liquid phase transfer line L10 may further include a branched liquid return line L11 connected to the inside of the bunkering tank 10 . The liquid return line L11 may be branched from the first liquid transfer line L10 from the outside of the bunkering tank 10 and connected to the inside of the bunkering tank 10 again, and a separate pump is not provided. Loading for a bunkering ship, that is, when supplying liquid liquefied gas to the bunkering tank 10, the liquid liquefied gas supplied through the liquid manifold 21 is transferred through the liquid transfer line L10, It may be supplied to the bunkering tank 10 through the return line L11.

The second liquid transfer line L12 is a line having one end connected to the bunkering tank 10 and the other end connected to the manifold 20 to allow liquid liquefied gas to flow. The second liquid transfer line (L12) has one end extending to the lower end of the inside of the bunkering tank 10 and connected to the second pump 12, and the other end may be connected to the liquid manifold 21 of the manifold 20 . The second liquid phase transfer line (L12) may transfer liquefied gas at a lower flow rate than the first liquid phase transfer line (L10), and may be, for example, a spray line.

The second pump 12 is provided inside the bunkering tank 10 and may be disposed at a position relatively lower than the first pump 11 . The first pump 11 can be used for loading and unloading of liquefied gas by processing a relatively large flow rate, and the second pump 12 is used to load and unload liquefied gas before or after loading and unloading of liquefied gas for bunkering. It may be for supplying only a small amount of liquefied gas to the storage tank or withdrawing a small amount of liquefied gas remaining in the bunkering tank 10.

For example, the second pump 12 may be disposed inside a sump (not shown) formed on the bottom of the bunkering tank 10 . The sump is provided in the shape of a puddle at the bottom of the bunkering tank 10, and after most of the liquefied gas is withdrawn from the bunkering tank 10, a small amount of liquefied gas may be stored in the sump. The second pump 12 may withdraw liquid liquefied gas accumulated in the sump.

The second liquid transfer line (L12) may include a liquefied gas supply line (L14) branching from the outside of the bunkering tank (10). The liquefied gas supply line (L14) may vaporize some of the liquid liquefied gas flowing through the second liquid transfer line (L12) and supply it to the liquefied gas demand place of the bunkering ship. A forced vaporizer 41 may be provided in the liquefied gas supply line L14. The forced vaporizer 41 may vaporize liquid liquefied gas by using fruit such as seawater, fresh water, or steam as a heat source and supply the liquefied gas to a demand place. A second gas return line (L25) branching from the liquefied gas supply line (L14) and connected to the gas phase transfer line (L20) may be provided in the liquefied gas supply line (L14). At least a portion of the vaporized liquefied gas in the forced vaporizer 41 may be supplied to the gas transfer line L20 through the second gas return line L25.

The gaseous transfer line L20 is a line having one end connected to the bunkering tank 10 and the other end connected to the manifold 20 to allow gaseous liquefied gas to flow. One end of the gas transfer line L20 may be connected to an upper end of the bunkering tank 10, and the other end may be connected to the gas manifolds V and 22 of the manifold 20. The bunkering ship transfers the boil-off gas generated inside the bunkering tank 10 through the gas phase transfer line L20 and transfers it to the outside of the bunkering ship through the gas phase manifold 22, or fuel supply lines (L21, L23 to be described later) ) can be supplied.

The manifold 20 is provided in the bunkering station of the bunkering ship, and is connected to the first liquid transfer line L10, the second liquid transfer line L12, and the gaseous transfer line L20 to flow in and out liquefied gas for the bunkering vessel. can The manifold 20 has a liquid manifold 21 having one end connected to at least one of the first liquid phase transfer line L10 and the second liquid phase transfer line L12 and a gaseous phase having one end connected to the gas phase transfer line L20. A manifold 22 may be included. The other end of each manifold can communicate with a liquefied gas storage tank for bunkering through a pipe (not shown) provided separately. The pipe may be provided to the loading arm, is suitable for flowing cryogenic liquefied gas, and may be connected to the manifold 20 by including a cryogenic adapter and a cryogenic coupler. The bunkering ship is connected to the bunkering target through the manifold 20 and can maintain a state in which liquefied gas can flow.

Although not shown, the bunkering station may be equipped with an ESD (Emergency Shut-Down system) connected to the manifold 20, and to monitor the temperature, pressure, flow rate, etc. of liquefied gas communicating through the manifold 20 A sensor and a valve for controlling the flow rate of liquefied gas flowing through each manifold may be provided. The bunkering station may be provided on top of the bunkering tank 10 in the bunkering ship. For example, the bunkering station may be disposed above or below the upper deck, and the bunkering tank 10 may be disposed between the bunkering station and the bottom of the bunkering ship.

A plurality of liquid phase manifolds 21 and a plurality of gas phase manifolds 22 may be respectively provided in the manifold 20 . A plurality of individual manifolds may be arranged side by side in a bunkering station. For example, in the manifold 20, two liquid phase manifolds 21 and two gas phase manifolds 22 may be sequentially arranged. The two liquid phase manifolds 21 may be provided to communicate with each other, and the two gas manifolds 22 may also be provided to communicate with each other, but is not limited thereto. Although not shown, a plurality of manifolds 20 may be provided in a bunkering ship. The manifold 20 is provided on one side of the bunkering ship and can be connected to a liquefied gas carrier, propulsion ship, terminal, platform, etc., and an additional manifold is provided at the stern to be connected to other bunkering ships.

The fuel supply line may supply the liquefied gas supplied from the bunkering tank 10 to the liquefied gas demand place of the bunkering ship. The liquefied gas demand source may be a gas combustion unit (GCU) or a power generation engine (G/E), but is not limited thereto, and may further include an auxiliary boiler. The gas combustion unit burns the gas handled in the ship using liquefied gas as fuel and can discharge it to the outside of the bunkering ship. The power generation engine may generate electric power using liquefied gas as fuel, and the generated electric power may be supplied to propulsion of a bunkering ship or to a power demand place in the ship. The auxiliary boiler can heat fresh water or sea water using liquefied gas as fuel, or generate steam. Preferably, the fuel supply line may have one end connected to the gaseous transfer line (L20) and the other end connected to a liquefied gas demand source to supply gaseous liquefied gas. For example, the fuel supply line may include a first fuel supply line (L21) and a second fuel supply line (L23) connected to different liquefied gas demand sources.

One end of the first fuel supply line L21 is connected to the gaseous transport line L20 to receive gaseous liquefied gas from the bunkering tank 10 and supply it to a liquefied gas demand place of a bunkering ship. The first fuel supply line L21 may include a high-duty (HD) compressor 30 . The HD compressor 30 may pressurize and supply gaseous liquefied gas supplied to the liquefied gas consumer through the first fuel supply line L21 according to conditions required by the liquefied gas consumer. Although not shown, the first fuel supply line L21 may further include a heater downstream of the HD compressor 30 . The liquefied gas is pressurized while passing through the HD compressor 30 and the temperature is increased, but may be lower than the temperature required by the liquefied gas consumer, and the heater may additionally heat the liquefied gas to meet the required temperature. Preferably, the HD compressor 30 may pressurize the gaseous liquefied gas flowing through the first fuel supply line L21 and supply it to the gas combustion unit.

The first fuel supply line L21 may receive liquefied gas from a gas processing line L30 to be described later. The gas processing line (L30) is connected to the manifold 20, and can supply the liquefied gas supplied from the liquefied gas storage tank for bunkering to the first fuel supply line (L21), the first fuel supply line (L21) After being pressurized by the HD compressor 30, it may be supplied to a liquefied gas demand place or supplied to the bunkering tank 10 and condensed.

When the flow rate or pressure of the liquefied gas flowing through the first fuel supply line L21 is low, the HD compressor 30 pressurizes the liquefied gas so that it can be supplied to the liquefied gas consumer or the bunkering tank 10 . The HD compressor 30 pressurizes the gaseous liquefied gas flowing through the first fuel supply line L21 and supplies it into the cryogenic liquid liquefied gas stored in the bunkering tank 10 to condense or liquefy the gaseous liquefied gas efficiency can be improved. The HD compressor 30 may pressurize gaseous liquefied gas to 10 to 20 bar. Although not shown, a plurality of HD compressors 30 may be provided.

One end of the gas processing line (L30) is connected to the manifold 20 and the other end is connected to the first fuel supply line (L21) to allow liquefied gas to flow. Preferably, the gas processing line (L30) has one end connected to one or more gas phase manifolds 22, and the other end may be connected downstream of the HD compressor 30 of the first fuel supply line (L21). The gas processing line L30 may receive exhaust gas or liquefied gas discharged from a liquefied gas storage tank of a bunkering target connected through the manifold 20 and transfer it to the first fuel supply line L21.

The gas processing line (L30) may include one or more branch lines branching from the gas processing line (L30) and connected to the first fuel supply line (L21). For example, the gas processing line (L30) is a first branch line (L31) and the first branch line (L31) branching between the manifold (20), the point where the gas processing line (L30) is connected to the first fuel supply line (L21) A second branch line L32 may be included.

The first branch line L31 may be branched from the gas processing line L30 and connected upstream of the HD compressor 30 of the first fuel supply line L21. In this case, the liquefied gas supplied to the gas processing line (L30) through the manifold 20 bypasses the HD compressor 30 on the first fuel supply line (L21) along the gas processing line (L30) to obtain the first fuel. It may be supplied to the supply line (L21) or supplied to the HD compressor 30 through the first branch line (L31).

The second branch line L32 may be branched from the gas processing line L30 and connected upstream of the HD compressor 30 of the first fuel supply line L21. At this time, the mixer 31 may be provided in the second branch line L32, and the gas phase branch line L22 branched from the gas phase transfer line L20 may be further connected to the mixer 31. In this case, at least a part of the liquefied gas supplied to the gas processing line L30 through the manifold 20 and the liquefied gas flowing through the gas phase transfer line L20 are mixed in the mixer 31, and the first fuel supply line (L21) may be supplied.

The second fuel supply line (L23) has one end connected to the gaseous transport line (L20) to receive gaseous liquefied gas from the bunkering tank 10 and supply it to the liquefied gas demand place of the bunkering ship. The second fuel supply line L23 may include a low-duty (LD) compressor 40 . The LD compressor 40 may pressurize and supply gaseous liquefied gas supplied to a liquefied gas consumer through the second fuel supply line L23 according to conditions required by the liquefied gas consumer. Although not shown, the second fuel supply line L23 may further include a heater downstream of the LD compressor 40 . Preferably, the LD compressor 40 may pressurize the gaseous liquefied gas flowing through the second fuel supply line L23 and supply it to the power generation engine.

The second fuel supply line (L23) may receive liquefied gas from the gas processing line (L30). The gas processing line (L30) is connected to the manifold 20, and can supply the liquefied gas supplied from the liquefied gas storage tank for bunkering to the first fuel supply line (L21), the first fuel supply line (L21) At least a portion of the liquefied gas may be supplied to the second fuel supply line (L23) via the gas phase transfer line (L20). The liquefied gas supplied through the second fuel supply line L23 may be pressurized in the LD compressor 40 and then supplied to a liquefied gas demand place or supplied to the bunkering tank 10 and condensed.

The LD compressor 40 can handle a smaller flow rate than the HD compressor 30, and pressurizes the liquefied gas flowing through the second fuel supply line L23 so that it is supplied to the liquefied gas demand place or the bunkering tank 10. can The LD compressor 40 pressurizes the gaseous liquefied gas flowing through the second fuel supply line L23 and supplies it into the cryogenic liquid gas stored in the bunkering tank 10 to condense or liquefy the gaseous liquefied gas efficiency can be improved. The LD compressor 40 may pressurize gaseous liquefied gas at 10 to 20 bar. Although not shown, a plurality of LD compressors 40 may be provided and may be arranged in parallel with each other.

The second fuel supply line L23 may include a first gas return line L24 branching from the second fuel supply line L23 and connected to a gas injection line L30 to be described later. Preferably, the first gas return line (L24) can be branched downstream of the LD compressor (40) to transfer the gaseous liquefied gas to the gas injection line (L30).

The bunkering ship according to this embodiment may include a gas injection line (L13). The gas injection line L13 has one end connected to the fuel supply line and the other end connected to the bunkering tank 10 to allow liquefied gas to flow. Preferably, the gas injection line (L13) has one end connected to at least one of the first fuel supply line (L21) and the second fuel supply line (L23), and the other end is connected to the bunkering tank 10 to form a fuel supply line The liquefied gas supplied from may be delivered to the bunkering tank 10.

More specifically, the gas injection line (L13) has one end of the first fuel supply line (L21), the second fuel supply line (L23), the first gas processing line (L30), the first branch line (L31), the second The liquefied gas may be supplied by being connected to at least one of the branch line L32 and the first gas return line L24.

For example, exhaust gas or liquefied gas introduced into the bunkering ship through the manifold 20 and the gas processing line L30 may be directly delivered to the gas injection line L13 through the gas processing line L30. . Alternatively, the exhaust gas or liquefied gas may be delivered to the gas injection line L13 via at least a portion of the gas processing line L30 and the first fuel supply line L21. Alternatively, exhaust gas or liquefied gas passes through at least one of the first branch line L31 and the second branch line L32 through the gas processing line L30, and through at least a portion of the first fuel supply line L21. It can be delivered to the gas injection line (L13). Alternatively, the exhaust gas or liquefied gas is delivered to the gas injection line L13 through the first fuel supply line L21, the gas phase transfer line L20, and the second fuel supply line L23 through the gas processing line L30. It can be. When exhaust gas or liquefied gas passes through the second fuel supply line (L23), it may be delivered to the gas injection line (L13) via the first gas return line (L24) branching from the second fuel supply line (L23). have.

The other end of the gas injection line L13 may extend to the lower end of the inside of the bunkering tank 10, and at least a portion thereof may be provided to be submerged in liquefied gas stored in the bunkering tank 10. The gas injection line L13 may inject the liquefied gas supplied from the liquefied gas storage tank to be bunkered into the liquefied gas stored in the bunkering tank 10 to condense or liquefy at least a portion thereof. A control valve 14 may be provided outside the bunkering tank 10 in the gas injection line L13, and an injection nozzle 13 may be provided inside the bunkering tank 10.

The control valve 14 may control the flow rate of the gaseous liquefied gas supplied to the bunkering tank 10 through the gas injection line L13. When a plurality of bunkering tanks 10 are provided, the gas injection line L13 may be connected to each of the bunkering tanks 10a and 10b, and the corresponding first control valve 14a and second control valve 14b can be provided.

The injection nozzle 13 may inject gaseous liquefied gas supplied to the bunkering tank 10 through the gas injection line L13 into the liquid liquefied gas stored in the bunkering tank 10 . A plurality of injection nozzles 13 may be provided, and may be disposed along the height direction of the bunkering tank 10 in the gas injection line L13. That is, the plurality of injection nozzles 13 may be provided to inject liquefied gas at different heights within the bunkering tank 10 . For example, the first injection nozzle 13a may be disposed at the lowest height compared to other injection nozzles at the end of the gas injection line L13, and at a position spaced apart from the first injection nozzle 13a by a predetermined distance. Other spray nozzles 13b to 13d may be arranged. Although not shown, each of the injection nozzles 13a to 13d may be provided in plurality at a predetermined position on the gas injection line L13.

As described above, the bunkering ship according to the present embodiment is provided with a gas injection line (L13), so that the evaporation gas generated in the bunkering tank 10 or the exhaust gas or evaporation gas supplied from the liquefied gas storage tank for bunkering is transferred to the bunkering tank By injecting into the liquid liquefied gas stored in (10), at least some of it can be condensed or liquefied, so that re-liquefaction facilities can be reduced or omitted not only in bunkering ships but also in bunkering targets, and fuel for liquefied gas demanders in bunkering ships It is possible to minimize liquefied gas loss and increase bunkering efficiency.

Hereinafter, a process of processing liquefied gas in a bunkering ship according to an embodiment of the present invention will be described in more detail with reference to FIGS. 2 to 8 . 2 to 8 illustrate the case where the liquefied gas is liquefied natural gas, and the flow of liquefied gas or gaseous liquefied gas shown in each figure comprehensively illustrates various cases described in each embodiment. should be understood as

2 is a conceptual diagram illustrating a process of loading liquefied gas to a bunkering ship according to an embodiment of the present invention. The bunkering vessel includes a bunkering tank (10), a manifold (20), a first liquid transfer line (L10), a liquid return line (L11), a gaseous transfer line (L20), a first fuel supply line (L21), and a second fuel It may include a supply line (L23) and the like, and the same content as described with reference to FIG. 1 will be replaced with the content of the previous embodiment.

The bunkering ship according to the present embodiment may receive liquefied gas for loading from the outside and store it in the bunkering tank 10 before bunkering, that is, before loading the liquefied gas into the bunkering target. The bunkering ship may be supplied with liquefied gas from the outside through the manifold 20. The bunkering ship may be supplied with liquefied gas through the liquid manifold 21 and return liquefied gas through the gas manifold 22 at the same time. The liquid liquefied gas is supplied to the first liquid transfer line L10 connected to the liquid manifold 21 and may be stored in the bunkering tank 10 through the liquid return line L11. The gaseous liquefied gas may include boil-off gas generated by evaporation in the bunkering tank 10 as the liquefied gas is stored in the bunkering tank 10, and may be withdrawn through the gaseous transport line L20 have.

Gas-phase liquefied gas flowing through the gas-phase transfer line L20 may be discharged to the outside of the bunkering ship through the gas-phase manifold 22 . At this time, the pressure of the gaseous liquefied gas flowing through the gaseous transfer line L20 may vary according to the flow rate of the boil-off gas generated inside the bunkering tank 10. For example, when the flow rate of the boil-off gas is high, the gaseous liquefied gas flowing through the gaseous phase transfer line (L20) constitutes a free flow without separate pressurization to the outside through the gaseous manifold (21). can be supplied. However, when the flow rate of the boil-off gas is small, the flow of the gaseous liquefied gas from the bunkering tank 10 and the gaseous transport line L20 may not be smooth, which increases the internal pressure of the bunkering tank 10 And accordingly, it is possible to reduce the efficiency of supplying liquid liquefied gas. In this case, in the HD compressor 30 provided in the first fuel supply line (L21) by supplying at least a portion of the gaseous liquefied gas flowing through the gaseous transport line (L20) to the first fuel supply line (L21). can be pressurized. When the bunkering ship is moored to load liquefied gas into the bunkering tank 10, the operation load of the gas combustion unit may be reduced or not operated. Therefore, it is possible to use the first fuel supply line (L21) for supplying fuel to a liquefied gas consumer such as a gas combustion unit to discharge gaseous liquefied gas to the outside. The HD compressor 30 may pressurize the gaseous liquefied gas to the outside, for example, to a pressure required to transport it to land. The gaseous liquefied gas pressurized by the HD compressor 30 may be supplied to the gas processing line L30 or the gaseous branching line L22, and supplied to the gaseous manifold 22 through the gaseous transport line L20 or directly. and can be discharged to the outside.

Alternatively, the bunkering ship may supply some of the gaseous liquefied gas flowing through the gaseous transport line L20 to a liquefied gas demand place of the bunkering ship and use it as fuel. For example, the gaseous transfer line L20 may supply some of the gaseous liquefied gas to the power generation engine of the bunkering ship through the second fuel supply line L23. The liquefied gas demand of the bunkering ship can preferentially use the boil-off gas generated in the bunkering tank 10 as a fuel rather than the liquefied gas stored in the bunkering tank 10, which is a waste of liquefied gas due to external discharge of the boil-off gas It is possible to provide an effect of reducing and managing the internal pressure of the bunkering tank 10. An LD compressor 40 is provided in the second fuel supply line L23, so that gaseous liquefied gas can be pressurized and supplied at a pressure required by the power generation engine.

In this embodiment as described above, after processing the boil-off gas generated while loading the liquefied gas into the bunkering tank 10 of the bunkering ship using the HD compressor 30 or the LD compressor 40 provided in the bunkering ship, It is possible to improve the loading efficiency of the liquefied gas through the smooth treatment of the boil-off gas inside the bunkering tank 10 by discharging it to the outside or using it inside the bunkering ship.

3 and 4 are conceptual views illustrating a process in which a bunkering ship receives boil-off gas from a bunkering target and condenses it according to an embodiment of the present invention. The bunkering ship may be connected to the bunkering target through the manifold 20 so that liquefied gas can communicate with it. The bunkering ship includes a bunkering tank (10), a manifold (20), a first liquid transfer line (L10), a gas injection line (L13), a vapor transfer line (L20), a first fuel supply line (L21), and a second fuel It may include a supply line (L23), a gas processing line (L30), and the like, and the same description as that described with reference to FIG. 1 will be replaced with the description of the previous embodiment.

After loading the liquefied gas into the bunkering tank, the bunkering ship according to the present embodiment is connected to the bunkering target in order to load the liquefied gas into the liquefied gas storage tank of the bunkering target. The bunkering ship according to the present embodiment may receive and process liquefied gas, preferably boil-off gas, inside the liquefied gas storage tank before loading the liquefied gas into the liquefied gas storage tank for bunkering.

The bunkering ship can receive liquefied gas from the bunkering target through the manifold 20, and the gas injection line (L13) transfers the liquefied gas supplied from the liquefied gas storage tank of the bunkering target to the liquid phase stored in the bunkering tank 10. It can be injected into liquefied gas. Referring to FIG. 3 , a bunkering ship may inject boil-off gas into a gas injection line L13 for each of a plurality of bunkering tanks 10a and 10b. Referring to FIG. 4 , the bunkering ship may inject boil-off gas into the gas injection line L13 only for any one bunkering tank 10a.

The bunkering ship may receive boil-off gas from the bunkering target through the gas phase manifold 22 . While the boil-off gas flows through the gas treatment line L30 connected to the gas phase manifold 22, the first branch line L31, the first fuel supply line L21, the gas phase transfer line L20, and the second fuel The gas may be transferred to the gas injection line L13 through at least one of the supply line L23 and the first gas return line L24.

For example, when the pressure of the boil-off gas supplied from the bunkering target is sufficient to be supplied to the bunkering tank 10 via the gas injection line L13, the boil-off gas may form a free flow. In this case, the bunkering ship may supply the boil-off gas supplied through the gas processing line L30 to the gas injection line L13 via the first fuel supply line L21. At this time, the boil-off gas supplied to the first fuel supply line L21 through the gas processing line L30 may not pass through the HD compressor 30 provided on the first fuel supply line L21.

For example, when the pressure of the boil-off gas supplied from the bunkering target is insufficient to flow to the gas injection line (L13), the bunkering ship supplies the boil-off gas supplied through the gas processing line (L30) to the first fuel according to the flow rate After being supplied to the line (L21) or the second fuel supply line (L23) and pressurized, it can be supplied to the gas injection line (L13).

When the flow rate of the boil-off gas is low, the bunkering ship transfers the boil-off gas supplied through the gas processing line (L30) through the first branch line (L31) to the first fuel supply line (L21), gas phase transfer line (L20), and It can be supplied in the order of the second fuel supply line (L23). At this time, in the first fuel supply line (L21), based on the direction in which fuel is supplied to the liquefied gas demand place, the first boil-off gas is supplied upstream of the HD compressor 30, but instead of being supplied to the HD compressor 30, gaseous transport It may be supplied to the second fuel supply line (L23) via the line (L20). The boil-off gas supplied to the second fuel supply line L23 may be pressurized by the LD compressor 40 and supplied to the gas injection line L13 through the first gas return line L24.

When the flow rate of the boil-off gas is greater, the bunkering ship may supply the boil-off gas supplied through the gas processing line L30 to the first fuel supply line L21 through the first branch line L31. The boil-off gas supplied to the first fuel supply line (L21) may be pressurized by the HD compressor 30 and supplied to the gas injection line (L13). Alternatively, when the flow rate of boil-off gas is greater or the flow rate of boil-off gas suddenly increases due to changes in environmental conditions where the bunkering ship and bunkering target are located, the bunkering ship removes the boil-off gas supplied through the gas processing line (L30) It can be supplied to both the first fuel supply line (L21) and the second fuel supply line (L23) through the first branch line (L31). The bunkering ship can process boil-off gas by using both the HD compressor 30 of the first fuel supply line (L21) and the LD compressor 40 of the second fuel supply line (L23), and the pressurized boil-off gas is gas It may be injected into the bunkering tank 10 through the injection line L13.

The gas injection line L13 extends to the inside of the bunkering tank 10 and may include a plurality of nozzles 13 for injecting liquefied gas at different heights in the bunkering tank 10 . Preferably, the gas injection line L13 may include a plurality of nozzles 13 disposed at regular intervals from the end to a point corresponding to 50% of the height of the bunkering tank 10. If the location of the nozzle 13 is higher than 50% of the height of the bunkering tank 10, the condensation effect of the liquid liquefied gas may be reduced.

The boil-off gas supplied through the gas injection line L13 may have a pressure sufficient to form a free flow or may be pressurized in the above-described HD compressor 30 or LD compressor 40, but the bunkering tank 10 It may be lower than the internal pressure. When the amount of liquefied gas or internal boil-off gas stored in the bunkering tank 10 increases, the internal pressure of the bunkering tank 10 may increase. In particular, as the flow rate of the liquefied gas increases, the The pressure may increase as you go down. The boil-off gas supplied through the gas injection line L13 may not reach the first nozzle 13a located at the most distal end. In this case, the second to fourth nozzles 13b to 13d) can be injected.

When a bunkering ship has a plurality of bunkering tanks 10a and 10b, boil-off gas is injected into all bunkering tanks 10a and 10b as shown in FIG. 3, or for any one bunkering tank 10a as shown in FIG. Evaporation gas can be injected. Referring to FIG. 3, the bunkering ship opens both the first control valve 14a and the second control valve 14b and injects boil-off gas into all bunkering tanks 10a and 10b, thereby storing liquefied gas for bunkering. A large amount of boil-off gas supplied from the tank can be quickly processed. However, as condensation of boil-off gas occurs in all bunkering tanks 10a and 10b, the temperature and pressure of the liquefied gas stored in each bunkering tank 10a and 10b may increase.

As shown in FIG. 4, the bunkering ship opens only the first control valve 14a and closes the second control valve 14b to use the first bunkering tank 10a for condensation of boil-off gas, and the second bunkering tank 10b ) can be used to withdraw liquid liquefied gas or to be used as a fuel supply source for liquefied gas demanders of bunkering ships. The second bunkering tank 10b, which is not used for condensation of boil-off gas, can maintain a relatively low temperature and pressure compared to the first bunkering tank 10a, so it is suitable for use in loading liquefied gas immediately after boil-off gas treatment. Preferably, the first bunkering tank 10a used for condensing boil-off gas may have a higher internal pressure than the second bunkering tank 10b. When the internal pressure of the bunkering tank 10 is low, the amount of boil-off gas can be increased as the boil-off gas is injected, and since the boil-off gas throughput through the gas injection line (L13) is limited, the internal pressure is higher Injecting boil-off gas into only one bunkering tank 10a and maintaining a relatively low temperature and pressure in the second bunkering tank 10b may be advantageous for loading and supplying liquefied gas thereafter.

In this embodiment as described above, prior to loading the liquefied gas into the liquefied gas storage tank for bunkering, the boil-off gas supplied from the liquefied gas storage tank is liquefied by liquefying the liquid stored in the bunkering tank 10 provided in the bunkering ship By injecting into the gas, the evaporation gas can be condensed and treated. At this time, a plurality of nozzles 13 are provided for each height in the gas injection line L13 for injection of the boil-off gas to inject the boil-off gas into the liquid liquefied gas regardless of the change in internal pressure of the bunkering tank 10 to improve the condensation efficiency. can A bunkering ship may inject boil-off gas into a plurality of bunkering tanks 10, but increase condensation efficiency by injecting boil-off gas into the first bunkering tank 10a having a relatively high internal pressure, and a second bunker with a relatively low internal pressure The tank 10b maintains a relatively low temperature and can then be used for loading liquefied gas and supplying fuel.

5 is a conceptual diagram illustrating a gassing-up process in which a bunkering ship supplies liquefied gas to a bunkering target according to an embodiment of the present invention. The bunkering ship includes a bunkering tank (10), a manifold (20), a second liquid transfer line (L12), a liquefied gas supply line (L14), a gaseous transfer line (L20), a second gas return line (L25), gas treatment It may include a line (L30), a first branch line (L31), a first fuel supply line (L21), and the like, and the same content as described with reference to FIG. 1 will be replaced with the content of the previous embodiment.

The bunkering ship according to the present embodiment may perform a gassing-up process as a test run support for a bunkering target. The gassing-up process is to first supply a relatively small flow rate compared to the loading of the liquefied gas to remove other gases present in the liquefied gas storage tank to be bunkered. The liquefied gas storage tank before loading the liquefied gas may be filled with inert gas such as carbon dioxide. Carbon dioxide contained in the inert gas is sublimated by the cryogenic liquefied gas as the liquefied gas is loaded thereafter, and may damage components such as a liquefied gas storage tank or a pump provided inside the liquefied gas storage tank. Through the gassing-up process, carbon dioxide inside the liquefied gas storage tank can be removed to protect the liquefied gas storage tank and other facilities.

The bunkering ship according to the present embodiment may supply a relatively small flow rate of liquefied gas to the liquefied gas storage tank before loading the liquefied gas into the liquefied gas storage tank to be bunkered. The bunkering ship may vaporize the liquefied gas stored in the bunkering tank 10 and then supply it to the liquefied gas storage tank for bunkering.

Since the gassing-up process supplies liquefied gas at a lower flow rate compared to the loading of liquefied gas and is performed before loading of liquefied gas, the bunkering ship is equipped with the first liquid transfer line L10 and the first pump 11 provided therewith It is possible to use a second liquid transfer line (L12) having a low processing flow rate and a second pump (12) provided thereto. The bunkering ship may withdraw liquid liquefied gas through the second liquid transfer line L12 of the bunkering tank 10, vaporize it, and supply it to a bunkering target through the manifold 20. The second liquid transfer line (L12) may supply the liquid liquefied gas to the liquefied gas supply line (L14). The liquefied gas supplied to the liquefied gas supply line L14 may be vaporized in the forced vaporizer 41 provided on the liquefied gas supply line L14 and supplied to the gas phase manifold 22 via the gas phase transfer line L20. have.

As gaseous liquefied gas is injected into the liquefied gas storage tank for bunkering, the gas stored in the liquefied gas storage tank may be discharged. The exhaust gas discharged from the liquefied gas storage tank of the bunkering target may be an inert gas, a boil-off gas of liquefied gas, or a mixture thereof, hereinafter referred to as exhaust gas. The exhaust gas may be supplied to the bunkering ship through the gas phase manifold 22 of the bunkering ship. The exhaust gas may be transported to the gas combustion unit through at least one of the first branch line L31 and the first fuel supply line L23 while flowing through the gas treatment line L30 connected to the gas phase manifold 22. can Since inert gas may be mixed with the exhaust gas, it is preferable to process it in a gas combustion unit instead of supplying it through the gas injection line L13.

For example, when the pressure of the exhaust gas supplied from the bunkering target is sufficient to be supplied to the gas combustion unit, the bunkering ship supplies the exhaust gas supplied through the gas processing line (L30) through the first fuel supply line (L21) It can be supplied with a gas combustion unit. At this time, the exhaust gas supplied to the first fuel supply line L21 through the gas processing line L30 may not pass through the HD compressor 30 provided on the first fuel supply line L21.

For example, when the pressure of the exhaust gas supplied from the bunkering target is insufficient to flow to the gas combustion unit, the bunkering ship removes the exhaust gas supplied through the gas processing line L30 through the first branch line L31. After being supplied to the upstream of the HD compressor 30 of 1 fuel supply line L21 and pressurized, it can be supplied to the gas combustion unit.

As described above, in this embodiment, liquefied gas is vaporized and supplied to the forced vaporizer 40 provided in the bunkering ship for gassing up during test operation of the bunkering target, and the exhaust gas discharged from the liquefied gas storage tank of the bunkering target is bunkering Can be handled on board. Accordingly, the bunkering target can reduce or omit a liquefied gas vaporizer or an inert gas processing facility.

6 is a conceptual diagram illustrating a cool-down process in which a bunkering ship supplies liquefied gas to a bunkering target according to an embodiment of the present invention. The bunkering ship includes a bunkering tank (10), a manifold (20), a second liquid transfer line (L12), a gas phase transfer line (L20), a first fuel supply line (L21), a gas branch line (L22), and a second fuel It may include a supply line (L23), a first gas return line (L24), a gas processing line (L30), a first branch line (L31), a second branch line (L32), etc., as described with reference to FIG. The same content will replace the description with the content of the previous embodiment.

The bunkering ship according to the present embodiment may perform a cool-down process as a test run support for a bunkering target, but is not limited thereto. The cool-down process is to remove the gas stored in the liquefied gas storage tank by supplying a small amount of cryogenic liquefied gas to the liquefied gas storage tank in the form of a liquid before loading the liquefied gas into the liquefied gas storage tank for bunkering. It can be done even when it is not commissioned. The liquefied gas storage tank before loading the liquefied gas may be filled with liquefied gas in a relatively high temperature compared to the liquefied gas in the liquid phase. The cool-down process is to reduce the amount of liquefied gas evaporated by the high-temperature gaseous liquefied gas during loading of the liquefied gas, and through the cool-down process, the temperature inside the liquefied gas storage tank is reduced to a temperature similar to that of the liquid liquefied gas. It can be lowered to protect liquefied gas storage tanks and other equipment.

The bunkering ship according to the present embodiment may supply a relatively small flow rate of liquefied gas to the liquefied gas storage tank prior to loading the liquefied gas into the liquefied gas storage tank for bunkering.

Since the cool-down process supplies a small flow rate of liquefied gas compared to the loading of liquefied gas and is performed before loading of liquefied gas, the bunkering ship is equipped with the first liquid transfer line L10 and the first pump 11 provided thereto. It is possible to use a second liquid transfer line (L12) having a low processing flow rate and a second pump (12) provided thereto. The bunkering ship may withdraw liquid liquefied gas through the second liquid transfer line L12 of the bunkering tank 10 and supply it to a bunkering target through the liquid manifold 21.

As the liquefied gas is injected into the liquefied gas storage tank for bunkering, the gas stored in the liquefied gas storage tank may be discharged. The gas discharged from the liquefied gas storage tank of the bunkering target may be a boil-off gas as a gaseous liquefied gas. The boil-off gas may be supplied to the bunkering ship through the gas phase manifold 22 of the bunkering ship. The boil-off gas may be supplied to the gas combustion unit or supplied to the bunkering tank 10 through the gas injection line L13 while flowing through the gas treatment line L30 connected to the gas phase manifold 22. Preferably, the boil-off gas may be injected into the liquefied gas stored in the bunkering tank 10 through the gas injection line L13. While the boil-off gas flows through the gas treatment line (L30), the first branch line (L31), the second branch line (L32), the first fuel supply line (L21), the gas phase transfer line (L20), the second fuel supply The gas may be transferred to the gas injection line L13 through at least one of the line L23 and the first gas return line L24.

For example, when the pressure of the boil-off gas supplied from the bunkering target is sufficient to be supplied to the bunkering tank 10 through the gas injection line (L13), the bunkering ship supplies the boil-off gas supplied through the gas treatment line (L30) It can be supplied to the gas injection line (L13) via the first fuel supply line (L12). At this time, the boil-off gas supplied to the first fuel supply line L21 through the gas processing line L30 may not pass through the HD compressor 30 provided on the first fuel supply line L21.

For example, when the pressure of the boil-off gas supplied from the bunkering target is insufficient to flow to the gas injection line (L13), the bunkering ship first After being supplied to the fuel supply line (L21) or the second fuel supply line (L23) and pressurized, it may be supplied to the gas injection line (L13).

When the flow rate of the boil-off gas is low, the bunkering ship transfers the boil-off gas supplied through the gas processing line (L30) through the first branch line (L31) to the first fuel supply line (L21), gas phase transfer line (L20), and It can be supplied in the order of the second fuel supply line (L23). At this time, the first fuel supply line (L21) may not pass through the HD compressor 30, and is pressurized by the LD compressor 40 of the second fuel supply line (L23), through the first gas return line (L24) It can be supplied through the gas injection line (L13).

When the flow rate of the boil-off gas is high, the bunkering ship transfers the boil-off gas supplied through the gas processing line (L30) through the first branch line (L31) through the first fuel supply line (L21) to the gas injection line (L13) can be supplied with The boil-off gas supplied to the first fuel supply line (L21) may be pressurized by the HD compressor 30 and supplied to the gas injection line (L13).

At this time, if the temperature of the boil-off gas supplied from the bunkering target is higher than a predetermined temperature, for example, a temperature required by each compressor, a problem occurs in which normal suction and discharge operations are not performed. Therefore, when the temperature of the boil-off gas supplied from the bunkering target is higher than a predetermined temperature, the bunkering ship mixes the boil-off gas with the relatively low-temperature liquefied gas from the bunkering tank 10 and supplies it to each compressor.

The bunkering ship may supply the boil-off gas to the mixer 31 through the second branch line L32 when the temperature of the boil-off gas supplied through the gas processing line L30 is higher than a predetermined temperature. At this time, at least a part of the liquefied gas in the gas phase inside the bunkering tank 10 may be withdrawn through the gas phase transfer line L20 and supplied to the mixer 31 . The bunkering ship may supply gaseous liquefied gas to the mixer 31 through a gaseous branching line L22 branching from the gaseous transporting line L20.

In the mixer 31, the evaporation gas and the liquefied gas in the gas phase are mixed to maintain the gas phase, but can be cooled to a temperature that can be processed by each compressor, and the cooled evaporation gas is passed through the first fuel supply line (L21) to the gas injection line. (L13) or supplied to the gas injection line (L13) via the first fuel supply line (L21), the gas transfer line (L20), the second fuel supply line (L23) and the first gas return line (L24) It can be. Accordingly, the HD compressor 30 and the LD compressor 40 can normally perform a pressurization operation by receiving the evaporation gas having a required temperature.

Injecting the boil-off gas into the bunkering tank 10 through the gas injection line L13 replaces the description of the previous embodiment.

In this embodiment as described above, the evaporation gas discharged as the liquefied gas is supplied for the test run of the bunkering target or the cooldown before loading is injected into the liquefied gas stored in the bunkering tank 10 provided in the bunkering ship Thus, the boil-off gas can be condensed and treated. At this time, the condensation efficiency can be improved by pressurizing the BOG using the HD compressor 30 and the LD compressor 40 of the bunkering tank 10 according to the flow rate of the BOG, and if the temperature of the BOG is higher than a predetermined temperature, the bunkering tank It is possible to ensure normal operation of the compressor by mixing it with the gaseous liquefied gas supplied from (10) and supplying it to each compressor.

7 is a conceptual diagram showing a process of depressurizing a liquefied gas storage tank of a bunkering target by a bunkering ship according to an embodiment of the present invention, and FIG. 8 is a conceptual diagram showing a process of the bunkering ship loading liquefied gas into a bunkering target . The bunkering ship includes a bunkering tank 10, a manifold 20, a first liquid transfer line L10, a first fuel supply line L21, a second fuel supply line L23, and a first gas return line L24 , a gas processing line (L30), a first branch line (L31), and the like, and the same content as described with reference to FIG. 1 will be replaced with the content of the previous embodiment.

The bunkering ship according to the present embodiment may depressurize the inside of the liquefied gas storage tank to be bunkered and load the liquefied gas into the liquefied gas storage tank.

Referring to FIG. 7 , a bunkering ship may receive gas discharged from a liquefied gas storage tank to be bunkered through a manifold 20 . Preferably, the exhaust gas discharged from the liquefied gas storage tank to be bunkered may be boil-off gas. The exhaust gas may be supplied to the bunkering ship through the gas phase manifold 22 of the bunkering ship. The exhaust gas flows through the gas treatment line L30 connected to the gas phase manifold 22, passes through the first fuel supply line L23, or passes through the first branch line L31 and the first fuel supply line L23. It can be supplied to the gas combustion unit through.

Referring to FIG. 8 , the bunkering ship may supply the liquefied gas stored in the bunkering tank 10 to the liquefied gas storage tank after processing the gas inside the liquefied gas storage tank to be bunkered. The bunkering ship may withdraw a large amount of liquefied gas through the first liquid transfer line L10 and the first pump 11 provided therein, and supply it to a bunkering target through the liquid manifold 21.

As the liquefied gas is injected into the liquefied gas storage tank for bunkering, the evaporation gas stored in the liquefied gas storage tank and the evaporation gas generated from the injected liquefied gas may be discharged. The boil-off gas may be supplied to the bunkering ship through the gas phase manifold 22 of the bunkering ship. The boil-off gas may be supplied to the gas combustion unit or supplied to the bunkering tank 10 through the gas injection line L13 while flowing through the gas treatment line L30 connected to the gas phase manifold 22. Preferably, the boil-off gas may be injected into the liquefied gas stored in the bunkering tank 10 through the gas injection line L13.

In this embodiment, as the supply of liquefied gas progresses, the flow rate of boil-off gas supplied from the bunkering target may also increase. Boiled gas supplied through the gas processing line L30 may be supplied to the gas injection line L13 via the first fuel supply line L21 or the second fuel supply line L23 according to the flow rate or pressure, which is It is replaced with the description of the above-described embodiment.

7 and 8, the method of operating a bunkering ship according to an embodiment of the present invention is largely divided into (1) supplying the gas inside the liquefied gas storage tank of the bunkering target to the gas combustion unit of the bunkering ship to obtain the liquefied gas It can be divided into a step of depressurizing the storage tank and (2) a bunkering step of supplying the liquefied gas stored in the bunkering tank to the liquefied gas storage tank. In this case, in the step (2), the bunkering ship may receive the boil-off gas generated in the liquefied gas storage tank and inject it into the liquefied liquefied gas stored in the bunkering tank.

Step (1) is to depressurize the inside of the liquefied gas storage tank for bunkering according to FIG. 7, and supply the gas inside the liquefied gas storage tank for bunkering to the first fuel supply line to obtain a gas processing unit of a bunkering ship may be processed in

In step (2), the liquefied gas is loaded into the liquefied gas storage tank for bunkering according to FIG. 8, and the bunkering ship receives the boil-off gas generated in the liquefied gas storage tank according to the loading of the liquefied gas, (L30), the first fuel supply line (L21) or the second fuel supply line (L23) and the gas injection line (L13) by flowing through and injected into the liquefied gas stored in the bunkering tank 10 to be condensed. The bunkering ship may flow at least a part of the boil-off gas supplied from the bunkering target to the second fuel supply line (L21) and supply it to the power generation engine.

Of course, the present invention is not limited to the above-described embodiment, and may include a combination of the above embodiments or a combination of at least one of the above embodiments and known technology as another embodiment.

In the above, the present invention has been described centering on the embodiments of the present invention, but these are only examples and do not limit the present invention, and those skilled in the art to which the present invention belongs do not deviate from the essential technical content of the present embodiment. It will be appreciated that various combinations or modifications and applications not exemplified in the embodiments are possible within the range. Therefore, technical contents related to modifications and applications that can be easily derived from the embodiments of the present invention should be construed as being included in the present invention.

10: bunkering tank 11: first pump
12: second pump 13: nozzle
14: regulating valve 20: manifold
21: liquid manifold 22: gas phase manifold
30: HD Compressor 31: Mixer
40: LD compressor 41: forced vaporizer
L10: first liquid transfer line L11: liquid return line
L12: second liquid transfer line L13: gas injection line
L14: Liquefied gas supply line L20: Gas phase transfer line
L21: first fuel supply line L22: weather branch line
L23: second fuel supply line L24: first gas return line
L25: second gas return line L30: gas treatment line
L31: first branch line L32: second branch line

Claims (5)

A method of operating a bunkering ship including a bunkering tank for storing liquefied gas,
(1) supplying the gas inside the liquefied gas storage tank of the bunkering target to the gas combustion unit of the bunkering ship to depressurize the liquefied gas storage tank; and
(2) a bunkering step of supplying the liquefied gas stored in the bunkering tank to the liquefied gas storage tank;
The bunkering ship,
In the step (2), the boil-off gas generated in the liquefied gas storage tank is supplied and injected into the liquefied liquefied gas stored in the bunkering tank,
The bunkering ship,
a first fuel supply line for pressurizing the liquefied gas supplied from the bunkering tank with an HD compressor and supplying the liquefied gas to the gas combustion unit; and
Further comprising a second fuel supply line for pressurizing the liquefied gas supplied from the bunkering tank with an LD compressor and supplying it to the power generation engine of the bunkering ship,
In step (1),
A method of operating a bunkering ship, wherein the bunkering target supplies gas inside the liquefied gas storage tank to the first fuel supply line. delete According to claim 1,
The bunkering ship,
Further comprising a gas injection line connected to the first fuel supply line and the second fuel supply line, respectively, and connected to the bunkering tank,
In step (2),
At least a portion of the boil-off gas generated in the liquefied gas storage tank is sequentially flowed through the first fuel supply line or the second fuel supply line and the gas injection line to be supplied to the bunkering tank. driving method. According to claim 3,
In step (2),
At least a portion of the boil-off gas generated in the liquefied gas storage tank is sequentially flowed through the second fuel supply line and the gas injection line and supplied to the bunkering tank, and at least a portion of the boil-off gas generated in the bunkering tank A method of operating a bunkering vessel, wherein the flow is supplied to the second fuel supply line and supplied to the power generation engine. According to claim 3,
The gas injection line,
The method of driving a bunkering ship, which is connected to the HD compressor downstream of the first fuel supply line and the LD compressor downstream of the second fuel supply line, respectively.

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