BOG RE-LIQUEFACTION APPARATUS AND METHOD FOR VESSEL

摘要

A re-liquefaction apparatus using evaporation gas as cooling fluid to re-liquefy evaporation gas generated from an LNG storage tank is disclosed. The bog re-liquefaction apparatus and a method for a vessel comprises: an evaporation gas compressing part to compress evaporation gas discharged from the storage tank; a gas turbine to consume energy of an evaporation gas compressed in the evaporation gas compressing part; a self-heat exchanger to perform heat exchange of the compressed evaporation gas which consumed a part of the energy in the gas turbine, and evaporation gas discharged from the storage tank; a reduction valve to reduce pressure of the compressed evaporation gas whose temperature is lowered through heat exchange in the self heat exchanger; and a gas-fluid separator to separate liquefied compressed evaporation gas from the compressed evaporation gas whose pressure is reduced by the reduction valve, and the separated gas returned to the storage tank.