PROCESS AND APPARATUS FOR RELIQUEFACTION AND RECYCLING OF BOG INTO AN LNG TANK

    公开(公告)号:US20240288125A1

    公开(公告)日:2024-08-29

    申请号:US18294447

    申请日:2022-08-02

    IPC分类号: F17C9/04

    摘要: Method and apparatus for reliquefying and returning boil-off gas (BOG) to a liquefied natural gas (LNG) tank, the method including: Withdrawing BOG (F2) from the headspace of an LNG tank; compressing the BOG in a first compression stage to a first pressure p1 between 8 and 18 bara and tapping of a first portion of this gas; further compressing a second portion of the gas from step in a final compression stage to a second pressure p2≥120 bara; cooling at least part of the further compressed gas to a first temperature T1 between −20° C. and −100° C.; expanding the gas from step to a third pressure p3 between 8 and 20 bara; and separating the gas from step into a liquid phase and a gaseous phase to combine the gaseous phase with the tapped first portion of the gas from the first compression stage and to return the liquid phase into the LNG tank.