Fluidized bed drying
The fluidized-bed drying is an industrial process for the drying of solids ( crystalline or particulate solids or extrudates etc.). In fluidized bed drying or fluidized bed drying, a particle system is kept in suspension by a flow directed against gravity. There is a high heat exchange through forced convection . Advantages over other drying systems are the fast kinetics (short drying time) and the low necessary temperature (low thermal load on the material to be dried). The disadvantage is the high energy input for fluidizing the layer.
Vibrated fluidized beds
When the fluidized beds are vibrated , the entire apparatus is made to vibrate. This serves to avoid dead zones and caking on the perforated base.
Technical application
There are continuous and discontinuous fluidized bed dryers. With continuous fluidized bed drying, the moist - mostly water-laden - solid is fed continuously (i.e. without interruption) into the dryer and the material to be dried is also discharged in a continuous stream. The adhering solvent is removed continuously with the laden gas stream (mostly air). Examples for the technical application:
- Drying of sodium chloride (table salt)
Fluidized bed drying is mainly used in the food, chemical and pharmaceutical industries.
Web links
- Declaration of fluidized beds (English)