ABSTRACT
Rotary dryers are commonly used in several industries, due to their low construction costs and versatility to handle a wide range of materials when in comparison with other types of dryers. The design of the flights, the dimensions of the equipment, and the operational conditions influence the drying rate and how the contact between the solid material and the drying gas occurs. By using an optimal load, both equipment efficiency and quality of the dry product are ensured. Furthermore, to ensure that the drum is operating in near-ideal conditions, it is essential to know the mass of solids transported by the flights and the volumetric holdup, which can be estimated by geometric models. This chapter focuses on the description of the dimensions of the equipment and flights formats for a better use of the active drying area of the dryers. It is also described the methods for design load determination and the influence of operational variables on ideal rotational speeds.
