Patent ID: 6935051
Filing Date: 2005-08-30
Classification: F26B

Abstract:
1. An apparatus for the heating or drying of particulate material comprising a vertically disposed inner cylindrical housing, a vertically disposed outer cylindrical housing positioned in surrounding relationship with said inner housing, the respective housings having inwardly facing opposed wall surfaces which define an annular space between said housings, said annular space having an inlet end adjacent the top of the housings and an outlet end adjacent the bottom of the housings, means for introducing particulate material into said inlet end and means for removing the particulate material from said outlet end, each of said opposed wall surfaces defining multiple alternating radially inward directed and radially outward directed circumferential sections whereby said annular space defines an undulating path from said inlet end to said outlet end, perforations defined by spaced apart sections of each wall surface wherein each wall surface is defined by circumferential perforated sections which alternate with circumferential sections without perforations and wherein the perforated sections of the wall surface defined by the outer housing are angled radially outward relative to the vertical axis of the outer housing, and the perforated sections of the wall surface defined by the inner housing are angled radially inward relative to the vertical axis of the inner housing, and means for introducing gas to said annular space through the perforated sections of one wall surface and means for withdrawing gas from said annular space through the perforated sections of the other wall surface whereby the particulate material is exposed to said gas as it moves between said inlet end and said outlet end.