Mixing of Particles in a Circulating Fluidized Bed

A phenomenological model of longitudinal mixing of particles in a circulating fluidized bed is formulated. The model allows for the main features of the process: ascending motion of particles in the core of the bed and their descending motion in the annular zone (internal circulation of the solid phase); considerable changes in the concentration of particles and in the values of the ascending and descending zones over the bed height; external circulation of the solid phase and the effect of the near‐bottom fluidized bed on the process as a whole. The validity of the initial proposition is confirmed by comparison of calculated and experimental curves of mixing.