Local porosity in conical spouted beds consisting of solids of varying density |
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Authors: | María J San José Martin Olazar Sonia Alvarez Alberto Morales Javier Bilbao |
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Affiliation: | Departamento de Ingeniería Química, Universidad del País Vasco, Apartado 644, 48080 Bilbao, Spain |
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Abstract: | Local bed voidage has been measured in conical spouted beds by means of an optical fibre, for different geometric factors of the contactor (angle and inlet diameter) and under different experimental conditions (height of the stagnant bed, particle diameter and air velocity). The study has been carried out with glass beads and materials of lower density (high- and low-density polyethylene, polypropylene and extruded and expanded polystyrene). From the results, a correlation has been proposed for calculation of the local bed voidage in the spout and annular zones. The effect of the experimental conditions on the bed voidage in the solid ascent (core) and descent (periphery) regions of the fountain has been studied and the fountain has been proven to be of greater importance in the design of conical spouted beds, as solid density and shape factor are lower. |
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Keywords: | Fluidization Hydrodynamics Particle processing Conical spouted bed Spouted bed Voidage |
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