Explain construction and application of tray dryer.

Explain construction and application of tray dryer.
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1 Answer

Answer :

Construction of tray dryer.

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• The simplest form of dryer , the source of heat ( electric heater or steam coil) is at floor level & relies on natural convection.

• Therefore no efficient heat transfer.

• Modern dryer consists of well insulated cabinet with strategically placed fans and heating coils.

• The air circulates through the dryer at 200- 2000 feet/mins

• In small ovens , there may be provision for a single passage of heated air , while in large units, the thermal efficiency is improved by recirculation of air which is reheated after its passage over each shelf.

• The forced air circulation increases heat transfer & reduces local vapour concentration.

Application of tray dryer.

Used

1) For drying of crude drugs

2)For chemicals

3)For powders

4)For Granules used in tablet manufacturing 

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