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Boil-off gas reliquefaction method for LNG vessel

A technology for liquefied natural gas and evaporated gas, which is applied in container discharge methods, gas/liquid distribution and storage, liquefaction, etc., can solve problems such as tank damage, and achieve the effect of maintaining re-liquefaction performance

Active Publication Date: 2018-07-31
DAEWOO SHIPBUILDING & MARINE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when boil-off gas accumulates in the storage tank, there is a risk that the pressure inside the storage tank will rise excessively causing damage to the tank

Method used

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  • Boil-off gas reliquefaction method for LNG vessel
  • Boil-off gas reliquefaction method for LNG vessel
  • Boil-off gas reliquefaction method for LNG vessel

Examples

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Embodiment Construction

[0069] Hereinafter, embodiments of the present invention will be explained in detail with reference to the accompanying drawings. The present invention can be applied to various ships such as ships equipped with engines fueled by natural gas and ships including liquefied gas storage tanks. It should be understood that the following examples can be modified in various ways and do not limit the scope of the present invention.

[0070] The boil-off gas processing system according to the present invention described below can be applied to all types of ships and marine structures provided with storage tanks for storing cryogenic liquid cargo or liquefied gas, including, for example, LNG carriers, liquefied ethane gas Ships such as carrier ships and LNG Regasification Vessels (LNGRV), and ships such as LNG Floating Production Storage and Offloading (LNG Floating ProductionStorage and Offloading, LNG FPSO) and LNG floating storage regasification Unit (LNG Floating Storage and Regasi...

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PUM

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Abstract

The disclousre provides a boil-off gas (BOG) reliquefaction method for a LNG vessel. The BOG reliquefaction method comprises the steps of: (1) compressing a boil-off gas; (2) cooling the boil-off gas,which has been compressed in step (1), by subjecting same to heat exchange with a boil-off gas as a refrigerant by means of a heat exchanger so as to obtain a fluid; (3) expanding a fluid which has been cooled in step (2); and (4) stably maintaining reliquefaction performance no matter how the quantity of the reliquefied target boil-off gas compressed in step (1) and supplied to the heat exchanger varies.

Description

technical field [0001] The present invention relates to a boil-off gas reliquefaction method for a liquefied natural gas (LNG) ship, in which boil-off gas generated in a storage tank of a liquefied natural gas (LNG) ship to be supplied as fuel to an engine exceeds the Excess boil-off gas for fuel demand is reliquefied using the boil-off gas as a refrigerant. Background technique [0002] The consumption of liquefied gases, such as liquefied natural gas (LNG), has increased dramatically worldwide in recent years. The volume of liquefied gas obtained by cooling natural gas to very low temperatures is much smaller than that of natural gas and is therefore more suitable for storage and transportation. In addition, since air pollutants in natural gas can be reduced or removed during the liquefaction process, liquefied gases such as liquefied natural gas are environmentally friendly fuels with low air pollutant emissions when burned. [0003] Liquefied natural gas is a colorless...

Claims

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Application Information

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IPC IPC(8): F25J1/00F25J1/02F02M21/02
CPCF02M21/0215F25J1/0022F25J1/0257F25J1/0279F25J1/0045B63B25/16B63H21/38F17C6/00F17C9/02F17C13/00F25J1/0025F25J1/0244F02M21/02F25J5/002F25J1/004F25J1/0202F25J1/0254F25J1/0277F28F9/0278F28D9/0006F28D2021/0033F02M21/0287F02M21/06F25J1/023B63J2/12B63J2002/125B63J2099/003F02B43/00F02B2043/103F25J2290/62
Inventor 丁海元姜东亿李準埰崔东圭
Owner DAEWOO SHIPBUILDING & MARINE ENG CO LTD