FUEL GAS SUPPLYING SYSTEM

摘要

PURPOSE: A fuel gas supply system is provided to reduce a cooling load for reliquefaction of boil-off gas by utilizing the cold heat of boil-off gas and LNG. CONSTITUTION: A fuel gas supply system comprises a high pressure pump(170), a vaporizer(180), a reliquefying device(140), a compressing unit(120), and a refrigerant pre-cooling heat exchanger(110). The high pressure pump draws out LNG from an LNG tank and compresses the LNG to high pressure. The vaporizer is installed in the middle of the fuel gas supply line after the high pressure pump. The reliquefying apparatus reliquefies the evaporative gas generating in the LNG tank. The compressing unit is installed in the middle of an evaporative gas liquefaction line connected from the LNG tank to the reliquefying apparatus and compresses the evaporative gas generating in the LNG tank. The refrigerant pre-cooling heat exchanger is installed between the LNG tank and the compressing unit and implements heat exchange between refrigerant and the evaporative gas circulating in the reliquefying device.