METHOD FOR TREATING LOW-TEMPERATURE LIQUID AND ITS BOIL-OFF GAS AND APPARATUS THEREFOR

摘要

PROBLEM TO BE SOLVED: To increase the pressure of a low-temp. liq. (e.g. an LNG) contained in a storage vessel and its BOG (boil-off gas) with a small power without using a cold-reserving container. SOLUTION: A BOG from an LNG storage vessel 10 is compressed to a first pressure with a first compressor 16 and mixed, using a mixer 17, with an LNG delivered under pressure from the vessel 10 to liquefy at least a part of the BOG. The resultant mixed fluid is separated with a gas-liq. separator 20 into gas and liq. components. The gas component is compressed to a second pressure, which is higher than the first pressure, with a second compressor 26 while the liq. component is compressed and evaporated with a second pump 22 and an evaporator 24.