US-12624798-B2 - Bunkering vessel

US12624798B2US 12624798 B2US12624798 B2US 12624798B2US-12624798-B2

Abstract

A bunkering vessel according to the present invention is for loading a liquefied gas to and unloading a liquefied gas from a liquefied gas storage tank of a target, and it includes a bunkering tank storing a liquefied gas; a manifold provided at a bunkering station of the bunkering vessel to flow in a liquefied gas to and flow out a liquefied gas from the bunkering vessel; a liquefied gas transfer line connecting the bunkering tank and the manifold to flow a liquefied gas; and a dry gas supply portion producing a dry gas, and the dry gas supply portion supplies a dry gas to the liquefied gas storage tank through the manifold before loading a liquefied gas to the liquefied gas storage tank to remove moisture inside the liquefied gas storage tank.

Inventors

Jae Sig HAN
Ki Hyung KWON
Dong Jin Lee
Bum Woo HAN
Jai Hyun PARK
Sang Ho Han
Hyun Suk Kim

Assignees

HD HYUNDAI HEAVY INDUSTRIES CO., LTD.

Dates

Publication Date: 20260512
Application Date: 20240719

Claims (7)

1 . A bunkering vessel for loading a liquefied gas to or unloading the liquefied gas from a liquefied gas storage tank of a target, comprising: a bunkering tank storing the liquefied gas; a manifold provided at a bunkering station of the bunkering vessel to flow in the liquefied gas to and flow out the liquefied gas from the bunkering vessel; a liquid phase transfer line transferring a liquefied gas in a liquid phase by connecting the bunkering tank and the manifold; and a gas phase transfer line transferring a liquefied gas in a gas phase by connecting the bunkering tank and the manifold, wherein the bunkering vessel supplies the liquefied gas through the manifold to the liquefied gas storage tank prepared at the target and receives a discharge gas from the target, and the bunkering vessel further comprising a liquefied gas vaporizer vaporizing the liquefied gas, wherein before loading the liquefied gas to the target, the liquefied gas vaporized at the liquefied gas vaporizer or a liquefied gas of a relatively small flow rate compared to a flow rate of the liquefied gas upon loading is supplied to the liquefied gas storage tank provided at the target through the manifold, and the discharge gas is received from the target, and wherein the liquefied gas vaporizer vaporizes a liquefied gas received from the bunkering tank or the liquefied gas storage tank and then supplies to the gas phase transfer line, and the discharge gas is a gas stored in the liquefied gas storage tank and then discharged when the liquefied gas vaporized at the liquefied gas vaporizer is injected into the liquefied gas storage tank.
2 . The bunkering vessel of claim 1 , wherein the bunkering vessel receives the discharge gas through the liquid phase transfer line or the gas phase transfer line.
3 . The bunkering vessel of claim 2 , wherein the liquid phase transfer line or the gas phase transfer line supplies the discharge gas to at least one of a gas combustion unit and a venting portion when a concentration of an inert gas included in the discharge gas is higher than or equal to a predetermined value, and supplies the discharge gas to at least one of the gas combustion unit and a buffer tank when a concentration of the inert gas included in the discharge gas is lower than a predetermined value.
4 . A bunkering vessel for loading a liquefied gas to or unloading the liquefied gas from a liquefied gas storage tank of a target, comprising: a bunkering tank storing the liquefied gas; a manifold provided at a bunkering station of the bunkering vessel to flow in the liquefied gas to and flow out the liquefied gas from the bunkering vessel; a liquid phase transfer line transferring a liquefied gas in a liquid phase by connecting the bunkering tank and the manifold; and a gas phase transfer line transferring a liquefied gas in a gas phase by connecting the bunkering tank and the manifold, wherein the bunkering vessel supplies the liquefied gas through the manifold to the liquefied gas storage tank prepared at the target and receives a discharge gas from the target, and wherein after the liquefied gas is unloaded from the liquefied gas storage tank, the liquefied gas is supplied to the liquefied gas storage tank through the manifold, and the discharge gas is received from the target, and the bunkering vessel further comprising a liquefied gas vaporizer vaporizing the liquefied gas, and wherein after the liquefied gas is unloaded from the liquefied gas storage tank, a liquefied gas in a gas phase is supplied to the liquefied gas storage tank.
5 . The bunkering vessel of claim 4 , wherein the discharge gas is a liquefied gas remaining in the liquefied gas storage tank.
6 . The bunkering vessel of claim 4 , wherein immediately after unloading the liquefied gas from the liquefied gas storage tank, the bunkering vessel supplies the liquefied gas to the liquefied gas storage tank through the liquid phase transfer line and receives the discharge gas through the gas phase transfer line.
7 . The bunkering vessel of claim 4 , wherein the liquid phase transfer line or the gas phase transfer line supplies the discharge gas to a buffer tank, wherein the buffer tank supplies the liquefied gas in a liquid phase to the bunkering tank.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a Bypass Continuation application of PCT/KR2022/001074 filed on Jan. 20, 2022. The disclosure of each of the foregoing applications is incorporated herein by reference in its entirety. TECHNICAL FIELD The present invention relates to a bunkering vessel. BACKGROUND ART Recently, as environmental regulations are strengthened, the use of liquefied natural gas (LNG), which is close to an eco-friendly fuel among various fuels, is increasing. Liquefied natural gas is generally transported through LNG carriers, and at this time, the LNG may 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 LNG becomes liquid, its volume is reduced to 1/600 compared to the gaseous state, so transport efficiency can be increased. Unlike diesel, when LNG is loaded into or unloaded from a vessel that transports LNG or uses it as fuel, it must be maintained in a cryogenic state. In addition, while loading and unloading are carried out, it is necessary to control the temperature and pressure of the storage tank in which LNG is stored for stable storage of the LNG. Therefore, recently, continuous research and development has been conducted on a bunkering technology for maintaining LNG in a liquid state and supplying it to LNG carriers or LNG-powered vessels and on vessels using the same. DISCLOSURE Technical Problem The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to provide a bunkering vessel capable of loading a liquefied gas to and unloading a liquefied gas from a liquefied gas storage tank of a target. In addition, another object of the present invention is to provide a vessel capable of controlling the temperature and pressure conditions inside a target liquefied gas storage to satisfy conditions required in individual processes for loading a liquefied gas to and unloading a liquefied gas from a bunkering vessel. Technical Solution A bunkering vessel according to one aspect of the present invention is a bunkering vessel for loading a liquefied gas to and unloading a liquefied gas from a liquefied gas storage tank of a target, including a bunkering tank storing a liquefied gas; a manifold provided at a bunkering station of the bunkering vessel to flow in a liquefied gas to and flow out a liquefied gas from the bunkering vessel; a liquefied gas transfer line connecting the bunkering tank and the manifold to flow a liquefied gas; and a dry gas supply portion producing a dry gas, wherein before loading a liquefied gas to the liquefied gas storage tank, the dry gas supply portion supplies a dry gas to the liquefied gas storage tank through the manifold to remove moisture inside the liquefied gas storage tank, and wherein the liquefied gas transfer line includes a liquid phase transfer line transferring a liquefied gas of a liquid phase; and a gas phase transfer line transferring a liquefied gas of a gas phase, and wherein the bunkering vessel further includes a gas supply line delivering a dry gas received from the dry gas supply portion to at least one of the liquid phase transfer line and the gas phase transfer line, wherein the gas supply line may supply a dry gas through the liquid phase transfer line when an external temperature of the bunkering vessel is higher than or equal to a predetermined temperature, and supply a dry gas through the gas phase transfer line when an external temperature of the bunkering vessel is lower than a predetermined temperature. A bunkering vessel according to another aspect of the present invention is a bunkering vessel for loading a liquefied gas to and unloading a liquefied gas from a liquefied gas storage tank of a target, including a bunkering tank storing a liquefied gas; a manifold provided at a bunkering station of the bunkering vessel to flow in a liquefied gas to and flow out a liquefied gas from the bunkering vessel; a liquefied gas transfer line connecting the bunkering tank and the manifold to flow a liquefied gas; and a dry gas supply portion producing a dry gas, wherein before loading a liquefied gas to the liquefied gas storage tank, the dry gas supply portion supplies a dry gas to the liquefied gas storage tank through the manifold to remove moisture inside the liquefied gas storage tank, and wherein the liquefied gas transfer line includes a liquid phase transfer line transferring a liquefied gas of a liquid phase; and a gas phase transfer line transferring a liquefied gas of a gas phase, and wherein the bunkering vessel further includes a gas supply line delivering a dry gas received from the dry gas supply portion to at least one of the liquid phase transfer line and the gas phase transfer line, wherein the gas supply line may supply a dry gas through the liquid phase transfer line when an internal temperature of the liquefied gas storage tank is higher than or equal to a