Heat saving method for drying wet solids

摘要

A heat saving method for drying wet particulate solids as the latter move upwardly in a loaded screw flight conveyer wherein, by establishing a non-condensable gas barrier at the upper end of the flight, the vapors formed by heating the upwardly moving mass are induced to flow downwardly for condensation by the cooler incoming particulate matter, thereby effecting an internal transfer of the heat of vaporization of the wetting liquid and a consequent reduction in the heat required to dry the particulate matter and recover the separated vapor in liquid form.