作　　者： ; ; ;

机构地区： 中南大学化学化工学院

出　　处： 《过程工程学报》 2010年第1期51-55,共5页

摘　　要： 在直径41mm、高1500mm的间歇操作三相流化床中对双组分固体颗粒的轴向浓度分布、混合和离析行为进行了实验研究.实验所用固体混合物为密度相近、直径不同的大孔吸附树脂(H-103)与橡胶球.采用多个百叶窗式金属网及床层膨胀法测量颗粒固含率及流化床气含率沿床层轴向的变化情况,借用描述液-固两相流化床的沉降?分散模型描述气-液-固三相流化床,并采用了Fan等的离析速度与床层高呈线性关系的假定.实验结果证明,沉降?分散模型可以用来描述气-液-固三相流化床中的固体浓度分布,Fan等的假设是成立的. Experiments were carried out to examine axial concentration distribution and mixing and segregation behaviour of binary solids mixtures in a three-phase fluidized bed of 41 mm I.D. and 1500 mm height under batch operation mode. Macroporous adsorption resin and rubber balls with different diameters but similar density were employed in the experiments. Multiple shutter plates and bed expansion method were used to determine axial variation of the bed properties including concentrations of particles in the binary mixture and gas hold-ups. The sedimentation-dispersion model which was employed to describe two-phase fluidized bed could be modified to describe three-phase fluidized bed. Experimental results show that the sedimentation-dispersion model could be used to describe the gas-liquid-solid three-phase fluidized bed of solid concentration distribution, and Fan＇s assumption was established.

关 键 词： 三相流化床 间歇操作 二元组分 混合与离析 沉降 分散模型

领　　域： [化学工程]