DRYING OF POWDERY MATERIALS IN A PULSED FLUID BED DRYER |
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Authors: | Z. Gawrzynski R. Glaser T. Kudra |
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Affiliation: | 1. Faculty of Apparatus and Process Engineering, Wroclaw University of Economics , Komandorska 118/120, Wroclaw , 53-345 , Poland;2. CANMET, Energy Diversification Research Laboratory , 1615 Lionel-Boulet Blvd, Varennes , PQ , J3X 1S6 , Canada |
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Abstract: | ABSTRACT Drying of recycled polypropylene powder was studied experimentally in a laboratory pulsed fluid bed dryer (PFB) with relocated air stream. It was proved that fluidization of fine particles having a large specific surface area and a broad size distribution is technically feasible when using the composite supporting grid. Drying and hydrodynamic characteristics for a pulsed fluid bed of fine particles are found to be similar to the ones for coarse particles. Equations for minimum pulsed fluidization velocity, pressure drop, and surface and volumetric heat transfer coefficients are given. |
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Keywords: | drying kinetics hydrodynamics heat transfer pressure drop polypropylene reduced moisture content size distribution |
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