MINIMUM SPOUTING VELOCITY OF BINARY PARTI CLE-SYSTEMS IN A SPOUTED BED WITH A DRAFT TUBE

For stable operation of a spouted bed with a draft tube, the minimum s pouting gas velocity for binary mixtures of glass beads is calculated based on three definitions. The effects of the mass fraction of finer particles and the distance of entrainment zone are investigated, and t he minimum spouting velocity is compared with that of coarser particle s only. As a result, it is shown that a higher gas velocity than the m inimum stable spouting gas velocity necessitates for the stable spouti ng, and the addition of only a small amount of finer particles causes the bed to spout at a much lower gas velocity.