27万m^(3) LNG全容储罐热角保护结构安全性分析  

Structural Safety Analysis for Thermal Corner Protection of 2.7×10^(5) m^(3) LNG Storage Tank

作　　者：陈团海[1] 张超[1] 肖立[1] 扬帆[1] Chen Tuanhai;Zhang Chao;Xiao Li;Yang Fan(CNOOC Gas and Power Group,Beijing 100028,China)

机构地区：[1]中海石油气电集团有限责任公司,北京100028

出　　处：《化工设备与管道》2025年第1期20-27,共8页Process Equipment & Piping

摘　　要：针对LNG储罐罐容增大后热角保护(TCP)结构在控制工况下受力和变形发生巨大变化的情况,研究了全球最大27万m^(3)LNG储罐的TCP结构安全性分析方法。首先建立了TCP热分析模型计算各泄漏工况下的温度场;随后采用“可分离接触”有限元技术建立了TCP结构分析模型,并进行非线性求解;最后采用应力线性化方法进行应力分类与校核,并对结构安全性进行评估。结果表明:泄漏后由于低温收缩的影响,TCP壁板与背部泡沫玻璃砖发生分离,TCP底板翘起,TCP壁板出现较大应力;TCP母材最大应力出现在壁板根部,焊材最大应力出现在顶盖板与预埋件连接处;储罐罐容增大后,TCP壁板膜应力增大明显,壁板膜应力由结构荷载及温差荷载共同产生,进行应力校核时需要剔除温度产生的二次应力影响。The TCP structural safety analysis method for the world's largest 270000 m^(3) LNG tank was proposed,considering that the TCP structure appeared significant changes in stress and deformation under the controlled cases after increasing tank capacity.Firstly,the TCP thermal analysis model for a 270000 m^(3) LNG tank was established to calculate the temperature field distribution under different leakage conditions.Subsequently,a TCP structural analysis model including the"separable contact"was established,and nonlinear solutions were performed.Finally,stress linearization method was used for stress verification and safety analysis.The results show that under the leakage case,the TCP wall plate and the foam glass brick at the back are separated,the TCP bottom plate is warped,and the TCP wall plate has a large stress due to the influence of low temperature shrinkage.The maximum stress of the TCP base material appears at the root of the wall plate,and the maximum stress of the welding material appears at the connection between the top cover plate and the wall embedded plate.The stress of the TCP wall plate membrane increases significantly after the tank capacity increases.The membrane stress is generated by mechanical and temperature loads simultaneously,when conducting stress verification of membrane stress,it is necessary to eliminate the influence of secondary stress caused by temperature.

关 键 词：超大型LNG储罐 热角保护 结构安全性 可分离接触 热固耦合 应力线性化 

分 类 号：TE972[石油与天然气工程—石油机械设备]