Analysis of the fluidization behaviour and application of a novel spouted bed
apparatus for spray granulation and coating


Gryczka, O. and Heinrich, S. and Jacob, M. and Deen, N.G. and Kuipers, J.A.M. (2009) Analysis of the fluidization behaviour and application of a novel spouted bed
apparatus for spray granulation and coating.
In: 9th International Symposium on Agglomeration, 22 - 26 June 2009, Sheffield, UK.

open access
Abstract:Spouted beds are well known for their good mixing of the solid phase and for their intensive heat
and mass transfers between the fluid phase and the solid phase. Nearly isothermal conditions are
enabled which is of advantage for the treatment of granular solid materials in granulation,
agglomeration or coating processes. In this work the hydrodynamic behaviour of a novel spouted
bed apparatus with two horizontal and slit-shaped gas inlets is investigated by high-frequency
recordings of the gas phase pressure fluctuations over the entire bed. The hydrodynamic stable
operation domain, which is of importance for operating the apparatus, will be identified and
depicted in the Re-G-Ar-diagram by Mitev [1]. Another focus of this work is the simulation of the
spouting process by application of a continuum approach in FLUENT 6.2. The effect of the
frictional stresses on the hydrodynamic behaviour is examined by performing simulations with and
without consideration of friction. The angle of internal friction fi in Schaeffer`s [10] model will be
varied and the simulation results will be compared with experiments. It was found that the influence
of friction is not very big by application of the quite simple and empirical frictional viscosity model
by Schaeffer [10] basing on soil mechanical principles. Also the simulation results under negligence
of friction were similar to those under consideration of friction. Another part of this work is the
industrial application of the novel spouted bed in granulation and coating processes. Compared to
classical fluidized beds, a much narrower particle size distribution, a higher yield and a higher
product quality was obtained in the novel spouted bed
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