3W Drying single drum dryer

Drum dryer operation.
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A drum dryer consists of one or two horizontally mounted hollow cylinder(s) made of high-grade cast iron or stainless steel, a supporting frame, a product feeding system, a scraper, and auxiliaries.
Typical structures of single and double drum dryers are shown in the video.
1. The diameter of typical drums ranges from 0.5m to 6m and the length from 1m to 6m.
 In operation, steam at temperature up to 200°C heats the inner surface of the drum.
The moist material is uniformly applied in a thin layer (0.5mm–2 mm) onto the outer drum surface.
Most of the moisture is removed at water boiling temperature. The residence time of the product on the drum ranges from a few seconds to dozens of seconds to reach final moisture contents of often less than 5% (wet basis) (Tang, et.al., 2003). The energy consumption in a drum dryer may range between 1.1 kg steams per kg of evaporated water and1.6 kg steam per kg of evaporated water, corresponding to energy efficiencies of about 60%–90% (Hall, 1986; Moore, 1995).