In static fluid bed dryer, a specially designed perforated plate is
used to keep the product in fluidization by upward moving velocity of air or
gas. Fluidization occurs when the drag force of the upward moving gas equals
or becomes more than the weight of the particle.
Mixing of product and drying media takes place.
High heat transfer and optimum physical reaction are achieved.
By using different velocity of gas and air, particle
classification is achieved.
Higher operating temperatures are possible because of rapid heat
and mass transfer rates.
Control of residence time makes possible to adjust moisture
content of dried product.
Because of no moving parts maintenance becomes negligible.
Application :
Drying, cooling or sterilization process for salts, polymers, chemicals &
fertilizers and pharmaceuticals & food stuffs.
The vibratory fluid bed dryer is used for fluidization of materials
which are often characterized by having one or more of the following
physical properties:
Wide particle size distribution
Low strength of wet or dry particles
Stickiness or thermo plasticity of the particles
Pasty properties of the wet feed
In the vibratory fluid bed dryer, the material is easily transported
through the dryer by the combined effects of fluidization and vibration. The
fluidization velocity can be judiciously selected to minimize entertainment
of the smaller particles, to avoid gas bubbling in the fluid bed thereby
minimizing attrition. The residence time can be adjusted, by varying the bed
height, through the overflow weir position. A cooling section can also be
provided,
by partitioning of the plenum chamber.
Application :
Drying or cooling, process for salts, chemicals, Tea and Milk products
(used as a secondary dyer)
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