Hydrodynamic characteristics of a gas- liquid –solid fluidized bed containing a binary mixture of particles

الملخص EN

The present work is an experimental study on the effect of solid loading and solid properties of both single and binary mixtures on the hydrodynamic parameters (gas holdup and bubble dynamics) of a fluidized bed bubble column.

The experiments were performed in a QVF glass made column of 15 cm diameter.

Wide range of solid particle diameters (0.5 to 3mm) with two different densities (i.e., 1025 and 1150 kg / m3) were investigated for the bubble effect on gas holdup and bubble dynamics using air with different gas superficial velocities ( 3 to 9 cm / s).

A binary mixture consisting of different compositions of solid particles was prepared to be utilized in the study.

It was observed that for specified operating conditions used in the experiments there is a proportional relationship between gas holdup and both superficial gas velocity and particle diameter while an inverse relationship exists between gas holdup and both solid concentration and particles density.

Bubble dynamics (i.e., bubble diameter and bubble rise velocity) is looked at from a different view point, it increases with increasing solid concentration and with decreasing particles diameter.