Abstract
Liquefied natural gas (LNG) has been a rapidly growing energy source due to its low carbon emissions, high energy density and ease of long-distance transportation. However, heat leakage into an LNG storage facility is unavoidable due to the lack of complete insulation. Owing to this heat ingress a portion of LNG vaporizes, thus forming what is referred to as Boil-off gas (BOG). Due to safety and economic considerations, BOG recondensation at an LNG regasification terminal is of utmost importance. This consumes a substantial amount of energy. Additionally, at the regasification terminal, the imported LNG is regasified using sea water as a heat source. This results in the wastage of the entire cold energy associated with LNG. The available LNG cold energy can be recovered for power generation using an Organic Rankine Cycle (ORC). In this study, we demonstrate the integration of BOG recondensation process with an ORC-based power generation configuration that utilizes LNG cold energy. The technical feasibility of the proposed integrated process is investigated using process simulation and optimization.
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