LNG BOIL OFF GAS RELIQUEFYING APPARATUS AND LNG SUPPLY SYSTEM PROVIDED WITH THE SAME

摘要

It is applicable to new and existing liquefied natural gas tanks, and provides a boil-off gas reliquefaction apparatus which is very inexpensive to invest. A first line L10, a first heat exchanger 10 for exchanging BOG, and a first return line branching from the first line L10 in the first heat exchanger to join an intermediate position of the compression process line (L12), an expander 13 for expanding the BOG passing through a part of the first heat exchanger 10, and a booster for boosting the BOG expanded in the expander 13 and passing through the first heat exchanger 10 ( 14), a second heat exchanger 11 for heat-exchanging the BOG passed through the first heat exchanger 10, and at least one for freely expanding and reliquefying the BOG passed through the second heat exchanger 11; The expansion valve 16 and the gas-liquid separator 12 which isolates BOG expanded by the expansion valve 16 into BOG and LNG are included.