A kinetic model is d e v e l o p e d for t h e drying of solids in fluidized b e d s , assuming a falling rate period following a constant rate period. Experimental d a t a obtained using b a t c h a n d continuous single a n d spiral fluidized b e d s are satisfactorily m a t c h e d with t h e ass
Drying of solids in vacuum fluidized bed
β Scribed by Bulent Umur Kozanoglu; Juan Antonio Vilchez; Joaquim Casal; Josep Arnaldos
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 874 KB
- Volume
- 80
- Category
- Article
- ISSN
- 0008-4034
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β¦ Synopsis
Abstract
A drying process in a fluidized bed under vacuum conditions is experimentally and theoretically studied. A fluidized bed operating in reduced pressure presents a possibility for a better quality of production, with safer process conditions. A mathematical model is developed for the reducedβpressure drying process in a fluidized bed. Some parameters were analyzed by comparing experimental results with model predictions. The predictions from the model agreed quite closely with the experimental data. The results showed that a decrease in pressure reduces the interparticular resistance. A good agreement was also found applying the model to data, at atmospheric pressure, from other authors.
π SIMILAR VOLUMES
Notation a air mass #ow, kg/s A air mass, kg c , c constants C N speci"c heat, kJ/kg K h enthalpy #ow, kJ/s H total enthalpy, kJ H T latent heat of evaporation, kJ/kg J evaporation rate, kg H O/kg dm s k drying rate constant, s\ ΒΈbed depth, m m #ow rate of dry matter, kg/s M dry matter mass, kg ΒΉ te