Evaluating the Potential for Overpressures from the Ignition of a LNG Vapor Cloud During Offloading
- 作者：Filippo GavelliScott G.DavisOlav R.Hansen
- 会议时间：2014-10-01
- 作者单位：GexCon US,7735 Old Georgetown Rd suite 1010,Bethesda, MD 20814
- 母体文献：2014油气储运安全消防技术研讨会论文集
- 会议名称：2014油气储运安全消防技术研讨会
- 会议地点：北京
- 主办单位：中国石油化工集团公司
- 语种：chi
摘要
Natural gas (composed primarily of methane) is generally not considered to pose overpressure hazards when ignited in unconfined and low-or medium-congested areas, as most of the areas within LNG regasification facilities can typically be classified.However, as the degrees of confinement and/or congestion increase, the potential exists for the ignition of a methane cloud to result in damaging overpressures (as demonstrated by the recurring residential explosions due to natural gas leaks).Therefore, it is prudent to examine a proposed facility's design to identify areas where vapor cloud explosions (VCEs) may cause damage, particularly if the damage may extend offsite.An area of potential interest for VCEs is the dock, while an LNG carrier is being offloaded: the vessel hull provides one degree of confinement and the shoreline may provide another;some degree of congestion is provided by the dock and associated equipment.In this paper, the computational fluid dynamics (CFD)software FLACS is used to evaluate the consequences of the ignition of a flammable vapor cloud from an LNG spill during the LNG carrier offloading process.The simulations will demonstrate different approaches that can be taken to evaluate a vapor cloud explosion scenario in a partially confined and partially congested geometry.