流化床内沉浸管磨损特性的理论预测  

Predictions on Erosion Rate of Immersed Tubes in the Fluidized Bed

作　　者：赵云华[1] 何玉荣[1] 陆慧林[1] 刘文铁[1] 刘雅宁[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江省哈尔滨市150001

出　　处：《中国电机工程学报》2007年第2期6-10,共5页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50376013)~~

摘　　要：基于气固两相双流体模型和颗粒动力学方法模拟流化床内气体和颗粒流动特性,采用单层能量耗散磨损模型模拟沉浸管的磨损率和亚网格尺度模型(SGS)模拟气相湍流流动,同时应用贴体坐标系使计算网格与沉浸管表面相吻合。模拟计算得到了沉浸管的瞬时磨损率和时均磨损率。数值模拟流化床内气固两相流体动力行为和沉浸管磨损特性。模拟计算结果表明沉浸管磨损受气泡尾涡及颗粒运动的直接影响。分析了沿沉浸管环向时均磨损率的变化规律。当沉浸管横向相对节距为2．0～3．0时磨损率达最大。数值模拟得到的流化床内构件磨损率与前人的实验结果和数值模拟相吻合。The erosion rate and fluid dynamics were simulated combining the gas-solid two-phase flow model with a monolayer kinetic energy dissipation model in the bubbling fluidized bed. The kinetic theory of granular flow was used to predict the particle fluctuating properties and the sub-grid scale model （SGS） for gas turbulent flow. The body-fitted coordinate approach was used to make the grids fit the borderline of immersed tubes. The instantaneous erosion rate was predicted, and the time-averaged erosion rate of immersed tubes was obtained. Simulated results show that the erosion of immersed tube is mainly influenced by local visible bubble flow and particle motion close to the tube. The erosion rate reaches a maximum at the ratio of tube spacing to tube diameter from 2.0 to 3.0. Calculated erosion rates are in agreement with previous findings.

关 键 词：鼓泡流化床 磨损率 颗粒动力学 单层能量耗散磨损模型 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程]