Discussion
A spray dryer is used principally for
Answer: B
Correct answer: Drying liquids to a powder in seconds
A spray dryer atomises a liquid feed into a fine mist within a chamber of hot air. Because the droplets are tiny, their surface area per unit mass is enormous and drying is complete in seconds, producing a free-flowing powder collected at the base and in a cyclone.
The short residence time is what allows heat-sensitive materials such as milk, coffee extract and egg to be dried at high air temperatures - evaporative cooling keeps the droplet near the wet bulb temperature until it is nearly dry. It cannot handle solids such as grain, fodder or fruit slices.
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