Operating Principle of a Single or Double Drum Dryer
A drum dryer is basically a conduction dryer. A wet feed film (in liquid or paste form) is applied to a rotating metal cylinder or a pair of metallic cylinders, that are heated inside with steam. Material film dries to the final moisture level and is scraped off the drums via a set of knife-blades.
Special Features of a Drum Dryer:
- Suitable for handling liquid or pasty feeds.
- Product in powdery, flaky form.
- Uniform drying due to uniform application of film.
- Medium range capacities.
- Very High thermal efficiency.
- Minimum Thermal degradation.
- Continuous operation.
- Accomplishment of drying in single step, eliminating need for any intermediate concentration processes.
Applications:
Paraffin wax, Clay, fire clay, plaster slag, incinerating and composing refuse, waste products, residue and sewage sludge, agricultural products , greenstuffs, grain, root vegetables, etc.