Drum Dryer

Principles of Drum Dryer

• Drum drying involves spreading a liquid or slurry on a rotating heated drum.
• As the drum rotates, the material dries and is then scraped off.

Construction of Drum Dryer

1. Rotating Drum: Hollow drum heated internally by steam or other means.
2. Feed System: Feeds material onto the drum surface.
3. Doctor Blade: Scrapes dried material off the drum surface.
4. Heating System: Heats the drum internally.

Working of Drum Dryer

1. Feeding: Material is fed onto the rotating drum.
2. Drying: Drum heats the material, causing moisture to evaporate.
3. Scraping: A doctor blade scrapes off the dried material.
4. Collection: Dried material is collected for further processing or packaging.

Uses

• Drying food products like purees, slurries, and chemicals.

Merits

• Rapid Drying: High drying rates.
• Compact Design: Space-efficient.
• Continuous Operation: Suitable for large-scale production.

Demerits

• Limited Material Suitability: Not suitable for heat-sensitive materials.
• Product Quality: Can cause degradation in some materials

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