Method of and an apparatus for drying pulverulent materials
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United States of America Patent
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Nov 13, 1984
Issued Date -
N/A
app pub date -
Mar 3, 1980
filing date -
Jun 8, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A body of pulverulent material is confined in a receptacle, and a screw conveyor having a vertical axis conveys a predetermined quantity of the material per unit of time in the upward direction. The amount of the pulverulent material which is being conveyed is such that it fills the space between the turns of the helical conveyor screw of the screw conveyor, which is surrounded by a jacket, only in part, thus leaving a passage in the screw conveyor through which a stream of drying air is conveyed in contact with the pulverulent material so that the drying air withdraws moisture from the material. The rotational speed and/or the pitch or spacing of the consecutive turns of the conveyor screw is so selected that only such an amount of the pulverulent material enters through an opening in the jacket of the screw conveyor while the space between two consecutive turns is juxtaposed with the opening as to only partially fill such a space.
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