Solid Particle Distribution in Centrifugal Impeller Contactors

摘要

The recently developed centrifugal impeller is examined to investigate the solid-liquid mixing in a mechanically agitated contactor. Using the sample withdrawal method, the effects of impeller geometrical parameters, impeller rotational speed (200-700 rpm), solid particle size (500-1100 lm), and solid loading (2-10 vol%) on the degree of homogeneity are studied. The axial and the radial solid concentration profiles and the minimum impeller speed for the complete homogenization are also determined. In comparison with a widely used propeller impeller, considerably higher homogeneity values in lower impeller speeds are obtained (90% homogeneity against 16% homogeneity at 200 rpm at the same conditions). Having also lower power consumption makes this a superior impeller in solid-liquid mixing processes especially in shear-sensitive systems.