一起液化石油气钢瓶爆炸案例的有限元分析  

Finite Element Analysis of a LPG Cylinder Explosion Case

作　　者：程永攀 陈强 盛维武 李小婷 陈险峰 魏嘉 CHENG Yongpan;CHEN Qian;SHENG Weiwu;LI Xiaoting;CHEN Xianfeng;WEI Jia

机构地区：[1]中石化炼化工程(集团)股份有限公司洛阳技术研发中心,河南洛阳471003

出　　处：《煤气与热力》2025年第3期I0042-I0046,共5页Gas & Heat

摘　　要：对一起民用液化石油气钢瓶爆炸事故进行了原因分析,经过宏观检查发现钢瓶下封头与底座连接圆周处存在大量腐蚀坑,利用有限元软件ANSYS对钢瓶进行弹塑性力学性能分析,观察钢瓶腐蚀坑附近的应力状态。当钢瓶腐蚀沟槽深度为0.3 mm时,内压由2 MPa升高到3 MPa时,腐蚀沟槽局部已发生屈服失效。在保持钢瓶内压为2.5 MPa时,当腐蚀沟槽深度达到0.4 mm时,腐蚀沟槽处的最大Mises应力达到材料的屈服强度;当腐蚀沟槽深度达到1.4 mm时,腐蚀沟槽处的最大Mises应力超过材料的抗拉强度,极有可能发生爆炸。The causes for an explosion accident of a civilian LPG cylinder are analyzed.After macroscopic inspection,a large number of corrosion pits are found at the circumference of the connection between the lower head and the base of the cylinder.Finite element software ANSYS is used to analyze the elastic‑plastic mechanical properties of the cylinder and observe the stress state near the corrosion pits.When the corrosion groove depth of the cylinder is 0.3 mm and the internal pressure increases from 2 MPa to 3 MPa,local yielding failure has occurred in the corrosion groove.When the internal pressure of the cylinder is maintained at 2.5 MPa,and the depth of the corrosion groove reaches 0.4 mm,the maximum Mises stress at the corrosion groove reaches the yield strength of the material.When the depth of the corrosion groove reaches 1.4 mm,the maximum Mises stress at the corrosion groove exceeds the tensile strength of the material,and there is a high possibility of explosion.

关 键 词：液化石油气钢瓶 腐蚀 应力集中 有限元分析 弹性失效 

分 类 号：TU996.9[建筑科学—供热、供燃气、通风及空调工程]