Slide 1

Jangam, Mujumdar - Classification and Selection

Drying of Foods, Vegetables and Fruits 75

Figure 3.4. Selection tree for spray dryers/atomizers

NO YES

NO

NO NO

NO

Feed properties

Viscous

Product requirements

Pneumatic

nozzle

Heat sensitive (^) > 1m^3 /h Particle
size
Shape
Open Cycle
system
Feed rate
Closed loop
system
Selection of spray dryer
Hazard know-how:
explosive, flammable;
toxicity
Sphere Agglomerated
Pressure
Nozzle
Coated or
Encapsulated
Counter current flow;
Two-stage/multi-stage
Co-current type
of spray dryer
Single stage
<10 μm
Pressure
Nozzle
5 - 120 μm 80 - 250 μm 200 - 1000 μm
YES
YES (^) YES
Pressure
Nozzle
Pressure Nozzle,
Centrifugal Atomizer
Pressure Nozzle,
Centrifugal Atomizer,
two-stage/multi-stage
Centrifugal
Atomizer
Multi-stage
pressure nozzle
YES
Centrifugal
Atomizer