Fluidized-solids reactors with continuous solids feed—II: Conversion for overflow and carryover particles

Abstract

Based upon the simple model of particles which keep their diameters almost constant during reaction with the gas flowing in the fluidized bed, and applying the exit age-distribution functions obtained in Part I, equations for the conversion of product particles were derived. For chemical reaction controlling: ▪ For gas diffusion through solid phase controlling: ▪ where y is the conversion of particles of diameter x, φ is the ratio of time required for complete conversion of one particle of diameter x to the average residence time of the particle. The above equations are applicable to both overflow and carryover particles, hence the conversion for overflow particles must be equal to that for carryover particles for a given particle size. The mean value of the conversion y can be given as follows: for overflow stream ▪ for carryover stream ▪ where K 1( x) and K 2( x) represent the size frequency distribution functions for the overflow and carryover particles respectively.