THE STABILITY OF WET SPOUTED BEDS |
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Authors: | Torsten Schneider John Bridgwater |
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Affiliation: |
a EKATO Ruhr- und Mischtechnik GmbH,, Schopfheim, Germany
b School of Chemical Engineering, The University of Birmingham, Birmingham, England |
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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. |
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