Tray Dryer

Principles of Tray Dryer

• A tray dryer operates on the principle of convection drying, where heated air circulates over the trays containing the wet material.
• The moisture from the material is transferred to the air and carried away, leaving the material dry.

Construction of Tray Dryer

1. Chamber: An insulated enclosure to maintain heat.
2. Trays: Perforated trays hold the material to be dried, allowing air to pass through.
3. Heating System: Heaters (electric, steam, or gas) provide the necessary heat.
4. Air Circulation: Fans circulate hot air to ensure uniform drying.
5. Exhaust System: Removes moist air from the chamber.

Working of Tray Dryer

1. Loading: Material is spread evenly on the trays.
2. Heating: Heaters raise the temperature inside the chamber.
3. Air Circulation: Fans circulate hot air over the material.
4. Moisture Removal: Moist air is exhausted out of the chamber.
5. Monitoring: Temperature and humidity are monitored and controlled.

Uses

• Drying pharmaceuticals, food products, chemicals, and powders.

Merits

• Uniform Drying: Even distribution of heat and air.
• Simple Operation: Easy to operate and maintain.
• Versatility: Suitable for a wide range of materials.

Demerits

• Slow Process: Can be slower compared to other drying methods.
• Labor Intensive: Requires manual loading and unloading.
• Energy Consumption: Can be energy intensive.

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