Process and device for drying solid materials in an indirectly heated fluidized bed

US5373648A · kind A · utility

Assignee

• Uet Umwelt- und Energietechnik GmbH · DE

Inventor

• Bodo Wolf · Berlin, DE

Key dates

• Filing date: Mar 18, 1993
• Grant date: Dec 20, 1994
• Expiry date: Mar 18, 2013

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F26B3/08
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process and apparatus are disclosed for drying solid materials, which allows the thermal energy used for drying to be recovered and the emissions produced during degassing and gasification to be reduced. A solid material which contains an evaporable material, particularly water, is fed to a fluidized bed drier. The solid material is fluidized by fluidizing medium, the fluidizing medium being the evaporable material. The dried solid material is removed from the drier and is fed to further processing, use or disposal. The non-condensable components of the solid material which are insoluble in the condensate of the evaporable material are separated by cooling and condensation of the vapor and released for subsequent use or disposal. The temperature of the fluidized bed is regulated by introducing solid material with a higher content of evaporable material, and by removing the dried solid material from, the fluidized bed, such that the temperature corresponds to the boiling curve of the evaporable material of the solid material removed from the fluidized bed. Therefore, the vapor removed from the fluidized bed contains gaseous substances of the evaporable material, other gaseous impu…