Global Processing

Dewatering-drying system

May 5, 2008

New dewatering-drying system consisting of a circular vibratory screener integrated with a circular fluid bed dryer removes oversize and undersize particles while dewatering and drying on-size material. The screener, a 30 in. (762 mm) diameter Vibroscreen model K30-2-SS, together with the 40 in. (1016 mm) diameter Kason model K40/48-1FBD-SS dryer, removes up to 50 gallons (189 liters) of water per minute, and dries up to 700 lbs (318 kg) of on-size particles per hour. The screener is equipped with an imbalanced-weight gyratory motor that vibrates the screening chamber, which is suspended on springs. Oversize particles travel in controlled spiral pathways from the center of the upper screen to a spout at the screen''s periphery where they are discharged for reprocessing. On-size dewatered pellets falling onto the lower screen travel in controlled spiral pathways to an extended spout at the screen''s periphery that leads to the fluid bed dryer. Undersize fines and water pass through the lower screen onto an integral metal chute and through a third spout for reprocessing. The circular fluid bed dryer is typically half the size and weight of a rectangular fluid bed dryer of equivalent capacity and allows consolidation of all primary system components. Inherent strength of the circular processor eliminates the need for heavy-gauge walls and cross braces otherwise required to withstand continuous vibration, allowing vibratory motors to be downsized.