Fluid Bed Dryer
What are fluid bed dryers?
Fluid bed dryers are designed to dry powder particles, where the residual moisture content is higher than what is wanted in the final powder. Hot drying air is distributed through specially designed perforated plates, on which the powder particles/agglomerates are resting.
The velocity of the drying air makes the powder ‘fluidize’, i.e. the particles get airborne; however, to the extent that only the finest/smallest particles leave the fluid bed with the air, while the bigger particles/agglomerates are conveyed/transported with the upward and forward directed flow of air (due to the perforation technique of the plate) into the subsequent section. Here cold and/or dehumidified air is introduced to cool the powder to the wanted temperature.
Fluid bed drying is suited for powders, granules, agglomerates and pellets with an average particle size between 50 microns and 5 mm.
What does GEA Niro offer?
GEA Niro offers two types of basic fluid bed designs, both individually designed to the solids flow pattern in the dryer.
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The integrated fluid bed is a back-mix fluid bed – typically connected directly below the drying chamber - from where moist powder, which is non-fluidizable, enters. It is used in the
MSD/FSD™, the
IFD™ and in
Compact Dryers™. The moisture content of the already fluidizing powder is lower than the powder that enters. The product temperature and moisture remain uniform throughout the fluidized layer. By controlling the powder layer in the back-mix fluid bed, the residence time can be controlled.
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The VIBRO-FLUIDIZER™ is a plug-flow fluid bed applied for powders that are directly fluidizable. The design of this type of fluid bed is important for achieving a narrow and controlled residence time distribution. The powder passes through the
VIBRO-FLUIDIZER™, while coming close to equilibrium with the incoming drying air.
Fluid Bed Dryer
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