摘要
对于内罐需设置锚固的低温LNG储罐,由于锚固结构较复杂,温度分布不均、梯度大以及多处热膨胀位置被约束限制,依靠理论解析法来确定结构强度已不现实,而数值求解的方法则是一条比较有效的途径。通过建立三维有限元数值模型并进行热力耦合模拟分析,以高地震区的SSE地震工况为例,得到了该工况下的温度分布、变形特点及各点应力状态。结果表明:在SSE地震工况下储罐具有较好的绝热效果;在内罐盛液后,由于温差的作用使锚固系统产生较大的变形及热应力,当应力过大时,通过对结构采取位移补偿的措施可降低其应力水平。研究结果对保障储罐的安全具有重要意义,并为类似低温储罐的温度场及力学分析提供参考。
For low-temperature LNG storage tanks that need to be anchored in the inner tank,due to the complex anchoring structure,uneven temperature distribution,large gradient and constraints on multiple thermal expansion locations,it is not practical to determine the structural strength by theoretical analysis,while numerical solution is a more effective approach.The temperature distribution,deformation characteristics and stress state of each point were obtained by setting up a 3D finite element numerical model and thermodynamic coupling analysis,taking the SSE earthquake condition in the high earthquake area as an example.The results show that the storage tank has good insulation effect under SSE earthquake condition.After the inner tank is filled with liquid,the anchoring system will produce large deformation and thermal stress due to the effect of temperature difference.When the stress is too large,the stress level can be reduced by taking displacement compensation measures for the structure.The research results are of great significance to ensure the safety of storage tanks,and provide a reference for the temperature field and mechanical analysis of similar low-temperature storage tanks.
作者
周威
金吉
杨传平
Zhou Wei;Jin Ji;Yang Chuanping(China Wuhuan Engineering Co.,Ltd.,Wuhan,Hubei 430223,China)
出处
《化工设备与管道》
CAS
北大核心
2023年第4期42-47,共6页
Process Equipment & Piping
关键词
LNG储罐
锚固
数值求解
温度场
应力分析
热力耦合
LNG storage tank
anchoring
numerical solution temperature field
stress analysis
thermodynamic coupling
作者简介
周威(1986-),男,高级工程师,硕士。主要从事大型储罐和压力容器的设计及应力分析的工作和研究。
