Discussion
Match each dryer in List I with the material it suits in List II.
List I
A. Spray dryer
B. Fluidised bed dryer
C. Deep bed dryer
D. Freeze dryer
List II
1. Free-flowing granular solids
2. Liquids and slurries
3. High-value heat-sensitive products
4. Bulk grain at modest cost
Select the correct match.
Answer: C
Correct answer: A-2, B-1, C-4, D-3
Each dryer is matched to the feed it can handle. A spray dryer (A) takes liquids and slurries (2), atomising them into hot air. A fluidised bed dryer (B) takes free-flowing granular solids (1) that can be suspended in an upward air stream.
A deep bed dryer (C) takes bulk grain at modest cost (4), its low capital cost matching the value of the commodity. A freeze dryer (D) takes high-value heat-sensitive products (3), whose quality justifies its expense. The list runs, in effect, from cheapest feed handling to most expensive quality preservation.
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