Prediction of the Height of the Lean-Bed Zone in Gas-Solid Semifluidized Beds

Abstract

It has been observed by many investigators that a lean-bed zone exists in between fluidized beds and packed beds.No attempt has been made however to predict it. Data have been obtained on the heights of the lean-bed zone in semifluidized beds using air-glass beads, air-ilmenite and airchromite systems. Based on the lines of statistical design, the experiments were carried out at two levels. An equation is presented for predicting the heights of the lean-bed zone in terms of solid, fluid and bed properties. The equation has been, verified by carrying out additional independent experiments and has been found to hold good within ±15per cent.