环柱形颗粒填充床传热参数

在一可同时测定轴向与径向温度分布的壁冷式固定床实验装置上 ,通过实验测定了球形、圆柱形和环柱形填充颗粒的径向有效导热系数和壁给热系数 .采用计及内、外环外表面积的颗粒等比表面积当量直径 ,将这些传热参数与Reynolds数相关联 .

HEAT TRANSFER PARAMETERS OF PACKED BED WITH RING PELLET

In the paper, the two-dimensional temperature profiles of spherical α -Al 2O 3, cylindrical methanol synthesis catalyst, and ring pellet ethylene oxide synthesis catalyst in packed bed with air flow are obtained by using a wall-cooled fix-bed experimental equipment, in which experimental temperature can be measured in both axial and radial directions at the same time. The radial effective conductivity and wall heat transfer coefficient are calculated by using a two-dimensional psuedo-homogeneous heat transfer model.With reference to different equivalent diameters for ring pellet, the equivalent specific surface diameter is determined by calculating both the inside and outside surfaces of ring pellet. The heat transfer parameters are correlated as a function of Reynolds number Re p.