Classification of Dryers

Classification of  Dryer

CLASSIFICATION OF DRYERS: 

Drying equipments may be classified in several ways. The two most useful classifications are based on—

1. The methods of transferring heat to the wet solids
2. The methods of handling of the wet materials/solids handling/supplying feed into the dryer.

Methods of transferring heat: This method classifies driers as—

1. Direct dryers:

a.            Batch type:

i.               Tray and compartment dryers

ii.             Fluidized bed dryer.

b.           Continuous type:

i.               Pneumatic conveying dryers

ii.             Rotary dryers

iii.           Spray dryers

iv.            Through circulation dryers

v.              Tunnel dryers

2. Indirect dryers:

a.            Batch type:

i.               Agitated pan dryers

ii.             Freeze dryers

iii.           Vacuum

-                     Rotary dryer

-                     Tray dryer

b.           Continuous type:

i.               Cylinder dryers

ii.             Drum dryers

iii.           Steam tube rotary dryer

Infra-red / Radiant /Dielectric heat dryer: