地下储油罐热力学有限元分析

Thermodynamic Finite Element Analysis of Underground Storage Tank

在石油工业的中下游产业中,使用有许多埋藏在地下的储油罐,其安装好后常会因受温度的影响造成油罐损坏而导致事故。因此储油罐在投入使用之前进行热力学有限元分析,避免可能发生的事故是有必要的。针对小型加油站地下储油罐,运用有限元软件ANSYS,采用耦合场分析的方法,计算地下储油罐由温度场引起的应力场分布。根据储油罐的轴对称结构,选择过其对称轴的一平面建立了地下储油罐的二维平面模型,先计算了其瞬态热传导问题,再根据温度分布计算储油罐应力场分布。通过计算得到储油罐瞬时温度场分布及储油罐应力场分布。计算结果表明,温度场对储油罐产生的等效应力为拉应力,在储油罐设计时应考虑其影响。

Many storage tanks are used in midstream and downstream production of petroleum industry; they often affected by temperature and induced tank damage, which caused some accidents after installation. Thus, in order to avoiding possible accidents, it＇s necessary to make thermodynamic finite element analysis for storage tank before using. The paper aimed at small scale gas station＇s underground storage tank, used software ANSYS and coherent field analytic method to calculate stress field distribution which was caused by the temperature field of underground storage tank. According to axisymmetric structure of storage tank, the paper selected a plane through its symmetry axis to create two-dimensional model, calculated its transient heat conduction problems at first, and then calculated tank＇s stress field distribution based on temperature distribution. According to calculation, obtained the instantaneous temperature distribution of storage tank and tank＇s stress field distribution. The results showed that equivalent stress which was caused by temperature field on the tank was tensile stress, and it＇s should be considered its impact at designing storage tank.