BOG BOG treatment system for LNG tank ship

摘要

The present invention relates to a fuel tank BOG treatment system for a gas propulsion vessel, comprising: an LNG fuel tank having a BOG circulation line in which BOG (Boil Off Gas) generated therein is circulated from an inlet to an outlet; A low temperature side liquefying equipment having a refrigerant line circulated through a heat exchanger, a cooler, a condenser, and an expander, and a refrigerant line for cooling the BOG by heat exchange between the refrigerant and the BOG in the heat exchanger; And separating the liquid and gas from the BOG installed in the BOG circulation line and cooled by the heat exchanger, the liquid being connected to the inlet side BOG circulation line to be recovered to the LNG fuel tank, And a gas-liquid separator connected to the circulation line and having a bypass line to be re-cooled by the heat exchanger.