双层罐底板结构立式储罐泄漏扩散数值模拟及结构优化

摘要

针对现有立式储罐底板承受双面腐蚀,易发生泄漏事故,且罐底板检测方法单一、被动的现状,提出了一种可实施泄漏在线监测的双层罐底板结构立式储罐方案。采用计算流体力学CFD方法,对两种不同罐底板结构进行了对比分析及优化研究,得到了一种兼顾流动均匀性及流动死区的结构形式。进一步模拟研究了泄漏位置、吹扫速度v对夹层空间出口体积分数φ及扩散稳定时间T的影响规律。结果表明,发生在三个不同位置的泄漏对φ的总体影响趋势一致,且随着v的减小,φ和T都呈增大的趋势,速度越小趋势越明显。研究结果对于促进双层罐底板结构立式储罐的国产化进程具有重要意义。%Oil and gas leak accidents easily occur in existing oil storage tanks for the double-sided corrosion and passive detection method.So a double-layer structure of oil storage tank was proposed in this paper.Computational fluid dynamics（CFD） methods were used to compare and optimize the two different bottom structures of oil storage tanks,the optimal parameters of the bottom structure met the demand of good flow uniformity and no stagnation zone was obtained.Furthermore,three dimensional numerical simulations were conducted on bottom structures with different locations of leak and inlet velocities（v） in order to get laws of outlet volume fraction（φ） and diffusion stabilization time（T） influenced by them.The results showed that the general tendency of leakage diffusion occurring in three different positions was roughly identical,that is,φ and T increased with the decrease of v,and the tendency became distinct when v decreased.The result of research has great significance for speeding up localization of double bottom structure of oil storage tank.