大型天然气储备装置FLNG采用薄膜型液货舱储存天然气,由于天然气低至-163℃,与外界温度形成高达200多度的温度差,因此有必要考虑热应力对结构的影响.本文以工程实际为研究背景,采用有限元方法计算了FLNG三舱段模型在绝缘层完整和破损下的热应力.同时结合服役环境,对大型FLNG在超低温作用下的安全性问题展开研究,分析超低温对FLNG结构强度的影响.所得结论对我国自主研发液化天然气储备装置具有一定的参考价值.%FLNG adopts membrane liquid cargo to store LNG,As the temperature of LNG could reach-163,it will be up to 200 degrees temperature with the external environment.It is necessary to consider the effect of thermal stress on structure.According to the practical engineering,using finite element method to calculus the thermal stress under different cases.And combining with the service conditions,this thesis work on structural safety problem and the strength of FLNG's structure under ultra-low temperature.The result of this paper could be helpful for future work on developing FLNG.
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