D类颗粒节涌流态化的实验和数值模拟  

Experiment and Numerical Simulation on Slug Fluidization of Geldart D Particles

作　　者：杨富军[1] 王嘉骏[1] 顾雪萍[1] 冯连芳[1] 

机构地区：[1]浙江大学化学工程联合国家重点实验室聚合反应工程分室,浙江杭州310027

出　　处：《过程工程学报》2005年第6期597-600,共4页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:20490200)

摘　　要：应用双流体气固两相流模型,对均一粒径分布的GeldartD类颗粒的节涌流态化过程进行了模拟.研究了流化过程中流化状态转变、床层膨胀比以及压力脉动功率谱,从Froude准数和颗粒动能的角度分析了模拟结果中的流化特性,并与实验数据进行了对比.模拟结果准确预测了GeldartD类颗粒的节涌流态化特性,对床层膨胀高度和功率谱的预测与实验基本吻合.Froude准数和颗粒动能随时间的周期性脉动较好地反映了流化床内节涌流态化的气泡行为.The fluidization of mono-diameter Geldart D particles was experimentally studied and numerically simulated with the two-fluid model based on the granular kinetic theory. The simulation results of voidage distribution show the clear characterization of slug fluidization. The predictions of bed expansion ratio and power spectrum density of pressure fluctuation calculated using FFT method are in agreement with those from experiments. Analysis on Froude number and particle kinetic energy is also carried out. The pseudo-periodicity of Froude number and particle kinetic energy against time reflects exactly the gas-solid heterogeneous flow structure and motion of large gas bubbles in slug fluidized bed.

关 键 词：GeldartD类颗粒 流化床 双流体模型 节涌流态化 

分 类 号：TQ021[化学工程]