US 5,656,179 AGranted

Device for continuous filtration and drying of a solid suspension

AssigneeBayer Aktiengesellschaft

InventorsDietrich Gehrmann, Norbert Schweigler

Life of this patent

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Abstract

The device for continuous filtration and drying of a solid suspension comprises a belt filter (1) and downstream a belt drier (2). By means of a porous conveyor belt (3) the filter cake generated in the belt filter (1) is conveyed further into the belt drier (2) in which there are provided heating devices for heating and drying the filter cake (7) which is on the conveyor belt (3). After leaving the belt filter (1), the filter cake (7) is present on the conveyor belt (3) in the form of a gas-permeable bed of solids in layer form having a maximum layer thickness of 50 mm, preferably a maximum of 20 mm. The heating devices in the belt drier comprise, on the one hand, a hot gas chamber (8) disposed above the conveyor belt (3) to generate a hot gas which flows through the bed of solids downwardly from above and, on the other hand, one or more contact heating elements (10, 15, 18, 19, 20, 22) disposed above and/or below the conveyor belt (3).

Claims11

Dependent claims

A method for filtering and drying a solid suspension comprising

a) charging and metering the suspension to be treated on to a previous conveyor belt to form a uniform gas permeable layer of solids, passing the conveyor belt through a filtration zone in which liquid is drawn off and collected below the belt while the solids contained in said suspension are retained on said belt in the form of a gas permeable bed of solids having a thickness equal to or less than 50 mm;
b) moving the conveyor belt with said gas permeable bed of solids thereon from the filtration zone into a heating zone comprising a source of hot gas and means for directing said hot gas through said gas permeable bed of solids and said belt and further comprising heating elements disposed above said belt, which can be brought into contact with said solids, heating elements disposed below said belt, which can be brought into contact with said belt, or both of said heating elements, wherein heat is imparted to the gas permeable layer of solids by
(a) directing a stream of hot gas through the gas permeable layer of solids and through the conveyor belt, or
(b) contacting the gas permeable layer of solids with one or more heating elements, which are disposed above the conveyor belt, or
(c) contacting the belt with one or more heating elements disposed below the conveyor belt, or any combination of (a), (b) and (c).

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/550,314Filed 30 Oct 1995 · division
Priority: DE 43 36 736.428 Oct 1993
Granted: 12 Aug 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

F26B 17/045
The belts being all horizontal or slightly inclined: the material on the belt being agitated, dispersed or turned over by mechanical means, e.g.…
B01D 33/04
Filters with filtering elements which move during the filtering operation: with filtering bands or the like supported on cylinders which are…
B01D 33/58
Filters with filtering elements which move during the filtering operation: handling the filter cake in the filter for purposes other than for…
B01D 33/642
By compression: by pressure belts