HOW TO USE FLUIDIZATION TO OBTAIN DRYING KINETICS COUPLED WITH QUALITY EVOLUTION

Abstract

This paper presents the main activities of the Gas Fluidization and Drying Team of the Chemical Engineering Laboratory at Toulouse. The emphasis has been put on the modeling of a fluidized bed dryer and its derivates such as a flotation fluidized bed, by the analysis of heat and mass transfer together with the physico-chemical transformations of the product during drying. Several studies have been performed on different solids (cereal and chemical products) to illustrate the effect of the operating conditions on dehydration and degradation kinetics The knowledge of heat and mass transfer coefficients in flotation fluidized bed allows to determine intrinsec drying and degradation kinetics. These kinetics can be used in any conductive or convective drier model.

Key Words and Phrases:

• Drying curves
• Solid-particles Fluidized bed dryer
• Cereal grains
• crystalline products