Fluidized Bed dryer - Wesman - #1

FLUIDIZED BED DRYER

When high-velocity air or gas passes through a bed of sand, the sand becomes a

gas-solid mixture with characteristics of a liquid. In this fluidized state close contact

between hot gas and sand enhances heat transfer by conduction and convection,

and ensures efficient mixing and uniform drying.

SAND DRYERS come in sizes

from 200 kg to 12 tonnes per

hour. It consists of a vertical

container holding the sand to

be dried, a distribution plate,

and a pressure chamber. Hot

air comes from an oil or gas

fired hot air generator or electric

air heater designed to operate

at high back pressure. Special

nozzles in the distribution plate

allow hot gases to pass through

but prevent sand from falling

into the pressure chamber.

STAR FEATURES

An expansion chamber at the top reduces the gas velocity and causes solid particles entrained in the fluidizing gas to drop back onto the bed. The exhaust gas may be passed through an optional CYCLONE SEPARATOR to extract fine particles which may be entrained. Wesman Fluidized Bed Sand Dryers operate at temperatures from 160°C to 600°C and can be configured for batch or continuous operation. Higher temperatures provide a greater yield but necessitate use of an after-cooler. Wesman supplies a matching after-cooler where, instead of hot air, ambient air fluidizes the column of hot sand from the dryer.

SEE REVERSE FOR INSTALLATION DIMENSIONS