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US 4,691,448 AGranted
Apparatus and process for drying finely grained solid particles
AssigneeKrauss-Maffei Aktiengesellschaft
InventorsFranz Alstetter, Herbert Schiele, Peter Sedlmayer, Gunther Hultsch
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Abstract
Agitator elements are provided in an apparatus and a process for the transport of heat and material between finely grained solid particles and a flow of carrier gas in a rotating fluid bed in order to prevent settling of coarse particles or agglomerates. The agitator elements are immersed into the fluid bed and move at a velocity different from that of the revolving fluid bed.
Claims23
A centrifugal drying apparatus for drying finely grained solid particles suspended in a fluid bed comprising:
- a means for housing the drying apparatus;
- means for screening solid particles wherein said means for screening exhibits a plurality of solid particle screening bores which allow passage of drying gas, said means for screening surrounds and defines a swirl chamber and is rotatingly mounted within said means for housing;
- means for charging the drying apparatus connected to said means for screening;
- means for introducing drying gas through said plurality of bores into the swirl chamber, wherein said solid particles and said drying gas form a fluid bed in said means for screening;
- means for agitating mechanically said solid particles in the fluid bed.
2 more elements
A process for drying solid particles in a fluid bed comprising the steps of:
- exposing said solid particles to a centrifugal field in a screening drum;
- traversing said particles by a carrier flow of gas penetrating through orifices of said screening drum in essentially a radial manner from the outside of the drum to the inside of the drum to cause a swirling effect;
- maintaining the solid particles in suspension in a fluid bed at an appreciable velocity relative to the flow of carrier gas;
- mechanically agitating the solid particles in the fluid bed.
1 more element
Dependencies are inferred from the claim text.