ATTRITION OF FCC POWDER IN THE JETTING REGION OF A FLUIDIZED-BED

Experimental data on the attrition of fluidized cracking catalyst (FCC ) powder in the jetting region of a fluidized bed indicate that the at trition rate is proportional to the orifice velocity raised to the pow er 3. This dependence is analysed here by coupling the kinetics of att rition, based on single-particle impact attrition testing, with a hydr odynamic model of the jetting region, from which the profiles of parti cle velocity and concentration can be calculated. It is shown that the approach predicts a power index which is in reasonable agreement with the experimental data, and it can therefore identify the relative con tributions to attrition arising from the material response and jet hyd rodynamics.