The objective of the study is to build a simple yet informative model of heat and mass transfer in a circulation fluidized bed and to adapt it to engineering practice. The theory of Markov chains is used for theoretical study. The model based on the local states of gas and solid allows calculating the drying kinetics, and takes into account crosswise heat and moisture transfers. It is validated at a lab-scale circulating fluidized bed. It is shown that the rate of circulation has the strong influence on drying kinetics. The generalization of experimental data made it possible to simplify the model and adapt it to engineering practice.

circulating fluidized bed, rate of circulation, drying kinetics, moisture content, Markov chain model.