The invention LNG supply line, the LNG stored in the storage tank boil-off gas supply for supplying a vaporized gas generated as natural evaporation in the second Station line, the evaporation for supplying LNG from the storage tank to the first Station is installed on the gas supply line comprises a first connection line connecting the first ejector, and the LNG supply line and the first ejector for pressurizing the evaporated gas to be supplied to the second Station; It said first ejector includes a first nozzle for supplying the LNG unit, unit a second nozzle for supplying the evaporated gas, and characterized in that it comprises said first nozzle portion and a bottleneck is formed on the second nozzle unit It relates to an LNG boil-off gas treatment apparatus using a supersonic ejector.
According to the invention, by treating the boil-off gas generated from the liquefied natural gas, it is possible to maintain a constant pressure in the LNG storage tank, it is possible to improve the structural safety of the LNG storage tank.