Method of Discharging LubricationOil in Boil-Off Gas Reliquefaction System and Method of SupplyingFuelfor Engine

Disclosed is a method for discharging the lubrication oil in a boil-off gas re-liquefaction system by compressing the boil-off gas by a compressor, cooling the compressed boil-off gas in a heat exchanger through heat exchange with the boil-off gas before compression, and reducing the pressure of the fluid, which has been cooled through the heat exchange, by a pressure reducing device. The lubrication oil discharge method is characterized in that the compressor includes at least one oil-feeding cylinder, the boil-off gas is compressed by the compressor after bypassing the heat exchanger through a bypass line, the boil-off gas compressed by the compressor is supplied to an engine, and the surplus boil-off gas remaining after the boil-off gas supply to the engine is supplied to the heat exchanger, such that the condensed or coagulated lubrication oil is dissolved or the viscosity thereof is lowered by the boil-off gas, which is compressed by the compressor and of which temperature is increased. 증발가스를 압축기에 의해 압축시키고, 압축된 증발가스를 압축되기 전의 증발가스와 열교환기에서 열교환시켜 냉각시키고, 열교환시켜 냉각시킨 유체를 감압장치에 의해 감압시켜, 증발가스를 재액화시키는 시스템 내의 윤활유를 배출시키는 방법이 개시된다. 상기 윤활유 배출 방법은, 상기 압축기는 급유식 실린더를 적어도 한 개 포함하고, 증발가스를 우회라인을 통해 상기 열교환기를 우회시킨 후 상기 압축기에 의해 압축시키고, 상기 압축기에 의해 압축된 증발가스를 엔진에 공급하고, 상기 엔진에 공급하고 남은 잉여 증발가스를 상기 열교환기에 공급하여, 상기 압축기에 의해 압축되며 온도가 높아진 증발가스에 의해 응축 또는 응고된 윤활유를 녹이거나 점도를 낮춰 배출시키는 것을 특징으로 한다.