BOIL-OFF GAS RELIQUEFACTION SYSTEM, METHOD FOR DISCHARGING LUBRICATING OIL IN BOIL-OFF GAS RELIQUEFACTION SYSTEM, AND ENGINE FUEL SUPPLY METHOD

摘要

A boil-off gas reliquefaction system is disclosed. The boil-off gas reliquefaction system comprises: a compressor for compressing boil-off gas; a heat exchanger for subjecting the boil-off gas compressed by the compressor to heat exchange, and thus cooling same, by using the boil-off gas before being compressed by the compressor as a refrigerant; a bypass line for enabling the boil-off gas to bypass the heat exchanger and be supplied to the compressor; a second valve for controlling fluid flow and opening/closing, which is installed on a second supply line for transferring, to the compressor, the boil-off gas used as a refrigerant in the heat exchanger; and a decompressing device installed at the rear end of the heat exchanger, and decompressing the fluid cooled by the heat exchanger, wherein the compressor comprises at least one oil-lubricated cylinder, and the bypass line converges into the second supply line at the rear end of the second valve.