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Fluid Bed Drier
Fluid Bed Drier
A Fluid Bed Drier is particularly suited to the drying of free flowing granular powders. It consists of a mass of powder, buoyed up out of permanent contact with each other by a flowing fluid (usually air). The turbulent activity within the mass of the powder as it dries promotes high mass and heat transfer rates, whilst ensuring that each powder particle is dried in a uniform manner. It consists of a supply fan, an inlet filter, a heat source which could be water, steam, or electricity this hot air is fed through to the fluidisation chamber via a perforated plate where the flow of hot air lifts the powder to be dried. The fines are usually lifted from the body of the drying powder and are caught in finger bag type sock filters. There is a pneumatic bag shaker attached to the filter bag support frame will routinely shake the bags to remove the build up of fines from these finger socks. The filtered air is exhausted from the powder drier via an exhaust fan and filter set.