Slide 1

Jangam, Mujumdar - Classification and Selection

Figure 3.2. Classification of fluidized bed dryer based on different criteria

Fluidized bed
dryers

Mode of

operation

Flow regime

Pressure

Batch

Continuous

Semi-Continuous

Well-mixed

Plug Flow Fluid bed dryer

Circulating

Hybrid

Low (Heat Sensitive products)

Atmospheric

High (steam)

Temperature Constant^

Time Dependent

Gas flow Continuous^

Pulsating

Heat flow

Continuous/pulsed

Convection/conduction

Fluidization

action

Gas flow

Jet flow (spouted bed dryer)

Mechanical (agitated bed dryer)

External (Vibrated bed dryer

Fluidization

medium

Heated air

Superheated steam^

dehumidified air

Freeze