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THE STABILITY OF WET SPOUTED BEDS
Authors:Torsten Schneider  John Bridgwater
Affiliation:1. EKATO Ruhr- und Mischtechnik GmbH, Postfach 1110/20, D-7860, Schopfheim, Germany;2. School of Chemical Engineering, The University of Birmingham , Birmingham, B15 2TT, England
Abstract:ABSTRACT

In granulation, coating or drying of slurries on inert particles a liquid phase is added to a gas-spouted bed. The effect of liquid injection on spouting velocity, fountain height, bed pressure drop and stability of the spouting regime is examined in a 0.15 m diameter bed with four types of inert particles 2 to 5 mm in size, 1140 to 2880 kg/m3 in true density, and 1.3 and 1400 mPa·s in liquid viscosity. Key factors are the liquid content and the presence of cohesive forces due to liquid bonds between particles. In a spoutability chart the maximum spoutable liquid content is related to the ratio of inertial force of a particle to the viscous or cohesive force exerted onto the particle by the liquid film. The spoutability chart serves to define regions of stable spouting.
Keywords:cohesive forces  spoutability chart  spouting velocity  bed pressure drop  processing liquid and pasty materials
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