METHOD AND APPARATUS FOR RETURNING SUPERCOOLED AND LIQUEFIED LNG IN LNG CARRIER

摘要

A device and a method for returning the over-coolant of a LNG ship are provided to reduce the cost and to prevent the pressure fluctuations of connecting system. A device for returning the over-coolant of a LNG ship comprises an over-coolant LNG removal vessel(5), a high pressure nitrogen gas supply line(L3) and a nitrogen gas exhaust line(L4). The over-coolant LNG removal vessel is installed in an over-coolant LNG return line(L2). The over-coolant LNG return line is connected to a LNG storage tank(1) from a vapor-liquid separator(4). The vapor-liquid separator separates over-coolant LNG from the evaporative gas. The high pressure nitrogen gas supply line is installed at over-coolant LNG removal vessel. The nitrogen gas exhaust line is installed at over-coolant LNG removal vessel. The nitrogen gas exhaust line ejects the nitrogen gas from over-coolant LNG removal vessel to the air.