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Numerical Simulation and Optimization of a Multilayer Belt Dryer for Granular Food Materials

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1008692.(doi:10.13031/2013.29703)
Authors:   Jian Chang, Ting-Ting Qi, Xiang-Dong Liu
Keywords:   dryer structure, garlic drying, heat and mass transfer, mathematical model, operating condition.

Proper design and operating optimization of a multilayer belt dryer are involved in a comprehensive understanding of its drying kinetics in the drying course. To investigate the distributions of material moisture content and temperature in granular bed and the profiles of air humidity and temperature in air channel above granular bed, which are decisive to decisions of dryer structure and operating condition, a mathematical model for simultaneous heat and mass transfer process in a multilayer belt dryer, was established. The numerical simulation based on the model was conducted for a practical drying process of garlic slices in an industrial scale dryer and the calculated results were verified by the collected data from the drying process. Based on the drying kinetic data obtained from the further simulations, the proper parameters of dryer structure, namely, length of belt for each layer, height of air channel between layers and number of belt layers, and operating conditions, namely, height of material bed, belt velocity and air velocity, were discussed.

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