Process and apparatus for drying material to be dried

Details Process and apparatus for drying material to be dried Process and apparatus for drying material to be dried

1992-05-07

1994-12-20

Gromada, Denise L.

Drying and gas or vapor contact with solids

Material treated by electromagnetic energy

Radio or high-frequency energy

34257, 34412, 34 92, F26B 334

Patent

active

053736460

ABSTRACT:
The invention relates to a process and an apparatus for drying sludge, in particular sewage sludge, or moist bulk material, wherein the material to be dried is heated by supplying energy by means of an electromagnetic alternating field generated between electrodes in a sealed pressurized vessel at an overpressure and the material moisture evaporated by the heating is used as heat transfer medium for heating the material to be dried in a step which is separate from the heating in the electromagnetic alternating field. In this process, the material to be dried is received with electrically insulated contiguous contact with the electrodes located in the pressurized vessel at least for a dwell time which is necessary for the heating and is then subjected to a flash drying.

REFERENCES:
patent: 2555450 (1951-06-01), Lee
patent: 3235971 (1966-02-01), Tooby
patent: 4222176 (1980-09-01), Tjurin et al.
patent: 4428127 (1984-01-01), Grassmann
patent: 4488362 (1984-12-01), Grassmann
patent: 4909899 (1990-03-01), Kiiskila
patent: 5172487 (1992-12-01), Hansen et al.

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