Importance

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Abstract

The invention relates to a method for reliquefying boil-off gas (BOG) containing volatile components, the method comprising the following steps: a) compressing a BOG stream, wherein the BOG stream exits a final compression stage as a finally compressed BOG stream having a final pressure; b) condensing the finally compressed BOG stream to obtain an at least partly condensed, finally compressed fluid stream; c) providing a fluid receptacle having a fluid stream inlet and a fluid stream outlet, wherein the position of the fluid stream outlet is selected such that it is above a predefined fluid containment volume; d) feeding the fluid stream from step b) through the fluid stream inlet into the fluid receptacle; e) setting a liquid level setpoint for the fluid receptacle such that the liquid level setpoint is at the level of the upper edge of the fluid stream outlet or a predefined amount above it; f) setting an upper final pressure limit for the final compression stage; g) measuring the liquid level in the fluid receptacle; h) measuring the final pressure; i) discharging a fluid stream from the fluid receptacle through the fluid stream outlet; j) cooling the fluid stream from step i) to a temperature equal to the saturation temperature of the fluid stream at a pressure lower than the final pressure, in order to condense gaseous components of the fluid stream; k) transferring the cooled fluid stream when the measured liquid level is at least equal to the liquid level setpoint and/or when the measured final pressure is equal to the final pressure limit. The invention also relates to an apparatus for carrying out the method.

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First Claim