Process and apparatus for drying material to be dried

US5373646A · kind A · utility

Assignee

• Sicowa Verfahrenstechnik Fur Baustoffe GmbH & Co., KG · DE

Inventors

• Franz Wosnitza · Aachen, DE
• Georg Zimmermann · Gerlingen, DE

Key dates

• Filing date: May 7, 1992
• Grant date: Dec 20, 1994
• Expiry date: May 7, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F26B7/00
• WIPO field: Environmental technology
• WIPO sector: Chemistry

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.