In spouted and spout fluid bed dryers, the suspension is spread into the be
d of inert particles, covering these particles with a thin layer. As the in
ert particles circulate, this suspension layer is dried and must become bri
ttle enough to break off by the particle attrition. The powder produced is
then carried out by air. Problems with the spout stability, particle agglom
eration and powder deposits inside the column should be overcome by control
ling the drying operation. The present work is aimed at modeling and simula
ting the drying of suspensions, such as organic and biological pastes, in c
onical spout-fluid beds of inert particles. A computer program has been dev
eloped combining the air flow and particle circulation models with the mass
and energy balances and the drying kinetic equations in order to describe
this drying process. The effect of cohesive forces is also incorporated to
the fluid flow model. Simulation results are analyzed and compared with exp
erimental data reported in the literature. Implication of these results in
drying suspensions is also discussed.