石油与天然气化工2025，Vol.54Issue(6)：48-55,8.DOI:10.3969/j.issn.1007-3426.2025.06.006
LNG储罐珍珠岩沉降的热-力耦合效应及保冷性能优化
Thermal-mechanical coupling effects and cryogenic performance optimization of perlite settlement in LNG storage tank
摘要
Abstract
Objective The aim is to address the insulation layer failure of large liquefied natural gas(LNG)storage tanks due to temperature changes and the settlement of expanded perlite during long-term operation,this study investigates the comprehensive impact on the cryogenic performance and structural safety.Method By comparing theoretical derivation and numerical simulation,the density distribution changes laws of the perlite insulation layer during the settlement process and its influence mechanism on cold leakage were analyzed.Based on the ABAQUS finite element software,a thermal-mechanical coupling model of the storage tank considering the settlement effect was established,and a sensitivity analysis was conducted to quantify the impact of settlement on the temperature field distribution.Result Firstly,the settlement of perlite led to an increase in density in the bottom area,forming a local thermal bridge effect.Secondly,the expansion of the upper voids caused by settlement enlarged the distribution range of low-temperature thermal stress,and the maximum thermal stress in the bottom concrete layer of the storage tank increased.Thirdly,the accumulation of boil-off gas(BOG)in the annular space intensified the local temperature change rate,which might induce the risk of concrete cracking.Conclusion The perlite settlement is the core factor leading to the degradation of the cryogenic performance and structural safety risks of LNG storage tanks.Optimizing the perlite filling process and adding gas diversion devices can improve the impact of BOG;the research results provide theoretical basis and engineering guidance for the design optimization and full life cycle maintenance of ultra-large capacity LNG storage tanks.关键词
超大容积/LNG储罐/珍珠岩沉降/温度效应/热-力耦合/蒸发速率/隔热优化Key words
ultra-large capacity/LNG storage tank/perlite settlement/temperature affect/thermo-mechanical coupling/evaporation rate/insulation optimization引用本文复制引用
刘洋,肖立,李宇航,孙小虎,何亚彬..LNG储罐珍珠岩沉降的热-力耦合效应及保冷性能优化[J].石油与天然气化工,2025,54(6):48-55,8.基金项目
中海石油气电集团有限公司科研项目"LNG储罐内珍珠岩状态三维精密化测绘成像装置及填充空腔智能计算系统研发"(QDKJZH-2024-14) （QDKJZH-2024-14）
