LNG BOG RELIQUEFACTION APPARATUS AND LNG BOG RELIQUEFACTION METHOD

摘要

An LNG(Liquefied Natural Gas) BOG(Boil-Off Gas) reliquefaction apparatus and a method are provided to reduce the temperature of BOG in a low temperature and high pressure state by heat-exchanging BOG compressed at normal temperature and high pressure by a compressor before exchanging heat with nitrogen, and BOG of very low temperature flowing out from a storage tank. The LNG BOG reliquefaction apparatus is composed of a BOG compressing unit(110) for compressing BOG generated from an LNG storage tank; a condenser(120) for condensing the BOG compressed by the BOG compressing unit; a nitrogen cycle for supplying cold heat to the condenser; and a self-heat exchanger(114) formed at a BOG supply line to cool down the BOG compressed by heat-exchanging the BOG of very low temperature generated from the storage tank and the high pressure BOG compressed by the BOG compressing unit.