基于有限元等效模型的大型膜顶搪瓷拼装储罐安全性分析

Safety analysis of large membrane-roofed enamel assembled storage tanks based on finite element equivalent modeling

为了提高储罐的安全性,建立了大型膜顶储罐的等效分析模型,分析不同工况下罐体壁板及其零部件的应力及变形,探究拉筋带数量、中心立柱高度等对罐体的应力及变形的影响规律,求解得到了其最优值。结果表明:在膜顶拼装储罐未产气加上雨雪天气影响等极端工况下,储罐的罐壁以及抗风圈发生失效,需要对储罐结构进行优化以提高罐体安全性;拉筋带数量和中心立柱高度是影响罐体安全性的主要因素,拉筋带数量增加到80根,中心立柱与拉筋带夹角增大到77.5°可以有效提高罐体的安全性;首层壁板厚度和膜压已为最优值,满足罐体安全性要求。所得结论可提高拼接罐体的可靠性,为后续拼接罐体的设计提供参考。

In order to improve the safety of the storage tank,the equivalent analysis model of large membrane-roofed tanks was established to analyze the stress and deformation of the tank wall plate and its components under different working conditions,the influences of the law of the number of tensile strips,the height of the center column,etc.on the tank's stress and deformation were investigated,and their optimal values were obtained.The results show that under the extreme working conditions such as the membrane-roofed assembled tank without gas production and the influence of rain and snow,the tank wall and the wind girder failed,and it is needed to optimize the structure of the tank in order to improve the safety of the tank;The number of tensile strips and the height of the center column are the main factors affecting the safety of the tank.When the number of tensile strips is increased to 80,and the angle between the center column and the tensile strips is increased to 77.5°,which can effectively improve the safety of the tank;The thickness of the first layer of the wall plates and the membrane pressure have been the optimal value,and meet the safety requirements of the tank.The conclusions obtained provide reference for the design of subsequent spliced tanks and improve the reliability of the spliced tanks.