Boil-off gas reliquefaction device and LNG supply system including the same

摘要

A boil-off gas reliquefaction apparatus that can be applied to new and existing liquefied natural gas tanks and has a very low investment cost. A first line (L10), a first heat exchanger (10) for exchanging heat of BOG, and a middle of a compression process line branched from the first line (L10) in the first heat exchanger. The first return line (L12) that joins the position, the expander (13) that expands the BOG that has passed through a part of the first heat exchanger (10), and the first heat exchanger (13) that is expanded by the expander (13). 10), a second heat exchanger (11) for exchanging heat of the BOG that has passed through the first heat exchanger (10), and a second heat exchanger (11). At least one expansion valve (16) for freely expanding and re-liquefying the BOG having passed through the gas), and a gas-liquid separator (12) for separating the BOG expanded by the expansion valve (16) into BOG and LNG And have. [Selection] Figure 1A