ABSTRACT In may 2002 , the author presented ( in the first CEE conference at MTC, Egypt, a new design for a compact circulating fluidized bed (CCFB) , to be used for incineration of solid wastes for pollution prevention and control of the environment. The present paper tries to evaluate the effectiveness and performance of such a design in another field of chemical engineering processing; this is the drying of solids or humidification of air. Results proved an acceptable performance for solids drying and for the use of solids as desiccants as well as humidification and dehumidification of gases. The results may be extended to the use of solids as adsorbents with acceptable performances.