大型LNG储罐翻滚现象的预测模型研究  

Study on prediction model of rollover accident of large LNG storage tank

作　　者：宋旦鹏 杜书成[2] 李兆慈[3] 孙恒[3] 

机构地区：[1]华电郑州机械设计研究院有限公司,郑州450015 [2]中国石油天然气股份有限公司天然气与管道分公司,北京100007 [3]中国石油大学(北京),北京102249

出　　处：《华电技术》2014年第4期22-23,26,共3页HUADIAN TECHNOLOGY

基　　金：中国石油天然气股份有限公司科技风险创新研究项目"大型LNG储罐分层机理及预测模型的研究"(07-06D-01-04-04-02)

摘　　要：大型LNG储罐储存过程中,充注分层是导致"翻滚"的直接原因。以意大利LNG储罐"翻滚"事故为例,以已有模型为基础,认为上、下层间存在中间过渡层。应用大空间自然对流换热关联式,提出一种计算通过分界面的热量、质量的方法,通过编程计算得到上/下层密度、温度及组分随时间变化的曲线,并对曲线进行了分析。分析结果表明:相邻层密度接近时,还存在一定的温度差,此时发生翻滚。In storage process of LNG in large LNG storage tank,the stratification of filled LNG in the tank is the direct reason causing'rollover accident'. Taking the 'rollover accident'of an Italian LNG storage tank as example,according to existing research model,it is believed that there is a transition layer between the upper layer and the under layer. Using the correlation of the natural-convection heat transfer in large space,a method to calculate the heat and mass transferred through the interface was proposed. By programming calculation,the variation curves of density,temperature and components of the LNG in upper and under layers over time were obtained. The curves were analyzed,and the analysis result shows that when the densities of the upper and under layers are nearly equal,there is certain temperature difference between the upper a under layers,and the rollover accident may occur under this condition.

关 键 词：液化天然气 储罐 分层 翻滚 自然对流 

分 类 号：TE972[石油与天然气工程—石油机械设备]