MATHEMATICAL MODELING OF DIFFUSION-CONTROLLED PNEUMATIC-CONVEYING DRYERS
作者:
JIANSTEVEN QI,
期刊:
Chemical Engineering Communications
(Taylor Available online 1996)
卷期:
Volume 146,
issue 1
页码: 185-199
ISSN:0098-6445
年代: 1996
DOI:10.1080/00986449608936489
出版商: Taylor & Francis Group
关键词: Modeling;Pneumatic;Conveying;Dryers
数据来源: Taylor
摘要:
A mathematical model for a continuous pneumatic-conveying dryer has been developed for removing internally bound moisture from solid particulates. The dryer relies on a recirculating carrier gas stream for entrainment. Drying is carried out by injecting into the gas loop a fresh stream of conditioned drying gas while an equal amount of wet gas is vented out. Because pneumatic-conveying dryers usually employ huge gas velocities, the particulates are well dispersed in the gas. Therefore, for solids absent of surface moisture, the drying kinetics is controlled by intraparticle diffusion. The mode! developed based on the diffusion mechanism relates the moisture reduction in the solids to various process parameters (diffusiv-ity, partition coefficient, particle size, residence time, solids loading, drying gas usage, and carrier gas recirculating rate), and is fully predictive. Therefore, it can be used to study the effects of these variables. The model was compared with the plant data and found to match the data within ± 15%.
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