HYDRODYNAMICS AND MASS TRANSFER IN A SPOUTED BED DRYER

The disposal of sludge generated by water treatment plants poses major financial and environmental problems. Drying of the sludge is an essential pan of any disposal process which may include incinerating, landfilling or upgrading. In the present study, experiments were carried out to investigate th...

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Bibliographic Details
Published in:Drying technology 2000-01, Vol.18 (1-2), p.323-340
Main Authors: El-Nans, M. H., Rognon, S., Legros, R., Mayer, R. C.
Format: Article
Language:English
Subjects:
DRYERS
DRYING
EBULLATED BED
ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
HYDRODYNAMICS
MASS TRANSFER
Mass transfer coefficient
Minimum spouting velocity
Sludge
SLUDGES
Spouted bed dryer
WASTE DISPOSAL
WATER TREATMENT PLANTS
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Summary:The disposal of sludge generated by water treatment plants poses major financial and environmental problems. Drying of the sludge is an essential pan of any disposal process which may include incinerating, landfilling or upgrading. In the present study, experiments were carried out to investigate the drying of sludge in a spouted bed and to characterize the hydrodynamics and mass transfer mechanisms. The effect of bed moisture content on the minimum spouting velocity (U ms ) was examined for sludge granules. U ms was found to increase with increasing the moisture content of the sludge particles. The gas phase mass transfer coefficient in the dryer was determined using porous calcined alumina particles and the results were compared with predictions by correlations available in the literature. The existing correlations gave poor predictions for the mass transfer coefficient. A new correlation for the mass transfer coefficient in a spouted bed dryer was developed based on the experimental results.
ISSN:0737-3937
1532-2300
DOI:10.1080/07373930008917707