Boil-off gas treatment system

Abstract

A boil-off gas treatment system is disclosed. The boil-off gas treatment system according to the present invention comprises: a compressor which compresses boil-off gas that is generated in an LNG storage tank of a ship or floating structure; a heat exchanger which cools the boil-off gas that has been compressed in the compressor using boil-off gas that is to be introduced into the compressor by means of exchanging heat therebetween; an expansion means which adiabatically expands the boil-off gas that was cooled in the heat exchanger; a gas-liquid separator which separates the boil-off gas that was adiabatically expanded in the expansion means into gas and liquid, and supplies liquefied natural gas to the LNG storage tank; and a bypass line which supplies the adiabatically-expanded boil-off gas from the downstream of the expansion means to the downstream of the gas-liquid separator.

Description

technical field

[0001] The present invention relates to a boil-off gas treatment system, and more particularly to a boil-off gas treatment system comprising: a compressor for compressing boil-off gas generated in an LNG storage tank of a ship structure or a floating structure; a heat exchanger, cooling the compressed boil-off gas by heat exchange with the boil-off gas to be supplied to the compressor; an expansion unit performing adiabatic expansion of the boil-off gas cooled by the heat exchanger; and gas-liquid separation machine that performs gas / liquid separation of the boil-off gas subjected to adiabatic expansion performed by the expansion unit, and supplies LNG to the liquefied natural gas storage tank in which a bypass line is constituted so that the adiabatic expansion The boil-off gas can be supplied from the downstream side of the expansion unit to the downstream side of the gas-liquid separator, thereby enabling diversification of system operation. Background tec...

Examples

Embodiment Construction

[0041] The above and other aspects, advantages and objects of the invention will become apparent from the accompanying drawings and the following description of exemplary embodiments of the invention.

[0042] Hereinafter, exemplary embodiments of the present invention will be explained in detail with reference to the accompanying drawings. Throughout the drawings, the same components will be denoted by the same reference numerals.

[0043] In general, the International Maritime Organization regulates nitrogen oxides (NO X ) and sulfur oxides (SO X ) emissions, and recent attempts to regulate carbon dioxide (C0 2 ) emissions. Specifically, for nitrogen oxides (NO X ) and sulfur oxides (SO X ) was raised in 1997 by the Agreement on the Prevention of Marine Pollution from Ships (MARPOL; The prevention of Maritime Pollution from Ships). Eight years later, the agreement fulfilled the requirements for implementation and entered into force in May 2005, and the regulation is no...

technical field

[0001] The present invention relates to a boil-off gas treatment system, and more particularly to a boil-off gas treatment system comprising: a compressor for compressing boil-off gas generated in an LNG storage tank of a ship structure or a floating structure; a heat exchanger, cooling the compressed boil-off gas by heat exchange with the boil-off gas to be supplied to the compressor; an expansion unit performing adiabatic expansion of the boil-off gas cooled by the heat exchanger; and gas-liquid separation machine that performs gas / liquid separation of the boil-off gas subjected to adiabatic expansion performed by the expansion unit, and supplies LNG to the liquefied natural gas storage tank in which a bypass line is constituted so that the adiabatic expansion The boil-off gas can be supplied from the downstream side of the expansion unit to the downstream side of the gas-liquid separator, thereby enabling diversification of system operation. Background tec...

Examples

Embodiment Construction

[0041] The above and other aspects, advantages and objects of the invention will become apparent from the accompanying drawings and the following description of exemplary embodiments of the invention.

[0042] Hereinafter, exemplary embodiments of the present invention will be explained in detail with reference to the accompanying drawings. Throughout the drawings, the same components will be denoted by the same reference numerals.

[0043] In general, the International Maritime Organization regulates nitrogen oxides (NO X ) and sulfur oxides (SO X ) emissions, and recent attempts to regulate carbon dioxide (C0 2 ) emissions. Specifically, for nitrogen oxides (NO X ) and sulfur oxides (SO X ) was raised in 1997 by the Agreement on the Prevention of Marine Pollution from Ships (MARPOL; The prevention of Maritime Pollution from Ships). Eight years later, the agreement fulfilled the requirements for implementation and entered into force in May 2005, and the regulation is no...

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