Rotary Dryers Fluid Dynamics Aspects and Modelling

• Published in: Particulate Drying pp. 103 - 130
• Main Authors: Barrozo, Marcos Antonio de Souza, dos Santos, Dyrney Araujo, Duarte, Cláudio Roberto, Nascimento, Sullen Mendonça
• Format: Book Chapter
• Language: English
• Published: United Kingdom CRC Press 2024; Taylor & Francis Group
• Edition: 1
• Subjects: Rotary Dryers; DEM Simulation; Filling Degree; Angular Position; Drum Rotation Speed; Froude Number; Particle Segregation; Nano Spray Drying; Fixed Bed Drying; Airborne Phase; Radial Segregation; Critical Solid Fraction; Critical Rotation Speed; Rotary Drum; Cfd Simulation; Superheated Steam Fluidized Bed; Total Holdup; Euler Euler Approach; Rotational Speed; Bed Material Surface; Superheated Steam Fluidized Bed Dryer; Granular Flow; Paste Feed Rate; Critical Froude Number; Axial Segregations
• ISBN: 9781032074672; 1032074736; 1032074671; 9781032074733
• DOI: 10.1201/9781003207108-7

Rotary dryers have been used in many industrial sectors, including the cement, fertilizer, and minerals industries, because of their high processing capacity and their greater flexibility in handling a wide variety of materials than other types of dryers. There are two main types of configurations of a rotary drum: with flights and without flights. For both configurations, the fluid dynamics aspects strongly influence the drying performance. This chapter presents some important analysis about the fluid dynamics behavior in rotary drums with and without flights. The prediction of the particle motion inside a rotary drum, including the effect of the granular material properties, is of fundamental importance. Particle segregation is shown to negatively affect the process performance in rotary drums, where minor differences in physical properties can segregate particles when rotary drums are in movement, yielding poor mixing zones.