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US 4,057,908 AGranted
Method and apparatus for drying damp powder
AssigneeGrefco, Inc.
InventorsMelvin J. Mirliss, Richard B. Nielsen
Life of this patent
Estimating the term…
Abstract
To dry fragile low density materials without damage, gas assisted injection and suspension of damp powder to a low velocity stream of heated gas followed by cyclone drying assures long residence time and produces a free-flowing product.
Claims13
A damp powder drier for producing unfractured particles or agglomerates, said drier comprised of:
- an extended duct having an inlet end and an outlet end;
- an enclosed volume having generally circular side walls;
- supply means, including a feed port, to provide a continuous supply of damp material to be dried to said extended duct;
- means to provide a flow of heated gas into the inlet end of said extended duct, said heated gas moving within said duct at low velocity and sufficient to suspend said damp material in said gas flow;
- delivery means connecting said outlet end of said duct of extended length to said enclosed volume and providing entrance to said enclosed volume generally tangentially to said circular side walls thereof whereby a swirling motion is induced in said gas;
- and
- discharge means to collect dried material from said enclosed volume and to exhaust said gas from said chamber by a separate path,
- said extended duct, said enclosed volume and said delivery means being unobstructed and providing in combination an unobstructed flow path for said gas.
5 more elements
The method for drying damp powder comprised of the steps of:
- feeding damp powder to be dried into a low velocity flow of heated gas;
- suspending said damp powder in said low velocity flow of gas;
- decreasing without increasing the velocity of said flow of gas and said suspended powder in progressive stages along the flow path of said gas and said suspended powder;
- and
- separating the powder, when dried, from said flow of gas.
2 more elements
Dependencies are inferred from the claim text.