大型LNG储罐充注引分层的数值模拟研究

摘要

研究大型LNG储罐充注对分层的影响规律,对了解大型LNG储罐分层现象及翻滚的预防有着重要意义.运用动网格技术建立了大型LNG储罐三维充注模型,分别研究了充注口速度、高度、长度、角度、管径等因素对分层的影响.结果表明:大型LNG储罐的最佳速度为5 m/s左右,当充注流量一定时,要根据最佳流速来确定充注口管径.当轻流体充注时,充注口角度在0°时最佳,且充注口高度越低越好;当重流体充注时,充注口角度在45°-60°范围内最佳.%Studying the phenomenon of stratification and the prevention of LNG rollover is important to realize the influence law of stratification caused by filling in large LNG storage tank.The 3 D filling model of large LNG storage tank was presented,and the influences of difference filling speed,filling pipe height,filling pipe diameter,filling pipe length,filling pipe angle on stratification were studied.The result shows that the most optimal filling speed in large LNG storage tank is about 5 m/s.Furthermore,when the filling flow rate is constant,filling pipe diameter is determined by this velocity.Moreover,when the lighter fluid is filling,the most optimal filling angle is 0°,and the lower the filling pipe height,the smaller the layered.When the heavy fluid is filling,the range of the most optimal filling angle is between 45° and 60°.