Flights in a rotary dryer are provided to________________?
Correct answer: D. Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
- A. None of these
- B. Reduce the residence time of solid
- C. Increase the residence time of the solid
- D. Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
Explanation
Flights pick up the solids and cascade them through the hot gas, repeatedly exposing fresh surfaces for heat and moisture transfer. Their main purpose is therefore to improve contact, rather than simply changing residence time.
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