Hot air is made to impinge in a plug flow manner on a moving loosely formed bed of wet feed. Moisture evaporates as the material traverses along the length of the bed and is rendered dry at the discharge end. Humid air is continuously exhausted. The dryer is employed for wet crystals which are very fragile as well for wet performed feeds which are not suitable for the normal belt dryer operation.
Features
Minimum operating cost due to indirect heating.
Outlet gas can be utilized for upstream drying process.
Low power requirement due to low RPM of the main calciner shell.