Dispersion characteristics of liquefied natural gas in a fuel preparation room
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This study investigated the dispersion characteristics of liquefied natural gas (LNG) in a confined space of a fuel preparation room under accidental leakage conditions. Eleven leakages and simulation scenarios were simulated using FLACS-CFD V22.2 to analyze the spatial and temporal evolution of LNG vapor dispersion within an enclosed environment. These scenarios encompassed variations in leak size, release direction, and ventilation rate to comprehensively assess the effects of key parameters on gas accumulation and dispersion behavior. The results revealed that the leakage orientation and ventilation efficiency significantly influenced the concentration distribution and dilution rate of the LNG vapor. In particular, inadequate ventilation and low air exchange rates lead to the creation of persistent high-concentration zones near the floor owing to the dense property of the cold LNG vapor. These findings provide critical insights for the design and safe operation of fuel preparation rooms and the establishment of reliable ventilation and gas detection strategies. This study contributes to enhancing the safety of LNG-fueled ships by offering practical recommendations for minimizing flammable gas accumulation and improving hazard prevention in enclosed fuel preparation rooms.
Abstract
This study investigated the dispersion characteristics of liquefied natural gas (LNG) in a confined space of a fuel preparation room under accidental leakage conditions. Eleven leakages and simulation scenarios were simulated using FLACS-CFD V22.2 to analyze the spatial and temporal evolution of LNG vapor dispersion within an enclosed environment. These scenarios encompassed variations in leak size, release direction, and ventilation rate to comprehensively assess the effects of key parameters on gas accumulation and dispersion behavior. The results revealed that the leakage orientation and ventilation efficiency significantly influenced the concentration distribution and dilution rate of the LNG vapor. In particular, inadequate ventilation and low air exchange rates lead to the creation of persistent high-concentration zones near the floor owing to the dense property of the cold LNG vapor. These findings provide critical insights for the design and safe operation of fuel preparation rooms and the establishment of reliable ventilation and gas detection strategies. This study contributes to enhancing the safety of LNG-fueled ships by offering practical recommendations for minimizing flammable gas accumulation and improving hazard prevention in enclosed fuel preparation rooms.