Discussion
Consider the following pairs of dryer and the material it suits:
Spray dryer - Liquids and slurries
Fluidised bed dryer - Free-flowing granular material
Freeze dryer - High-value heat-sensitive products
Drum dryer - Whole grains in deep beds
How many of the pairs given above are correctly matched?
Answer: D
Correct answer: Only three
Three pairs are right. A spray dryer suits liquids and slurries, which it atomises into hot air; a fluidised bed dryer suits free-flowing granular material that can be suspended in an upward air stream; and a freeze dryer suits high-value heat-sensitive products, whose structure and flavour it preserves.
The fourth is wrong. A drum dryer handles liquids and slurries, spreading a thin film on a heated drum - not whole grains in deep beds, which need a through-flow air dryer. A drum could not process a granular bed at all.
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