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

Process for the drying of solid material, which solid material includes less than 98% by weight of an evaporable material, said process comprising feeding said solid material to a fluidized-bed drier, in which an indirectly heated fluidized bed is formed which contains the solid material fluidized by a fluidizing medium, the fluidizing medium being the evaporable material in vapor form;

• discharging the dried material from the fluidized-bed drier;
• feeding the dried material, if required after cooling, to a subsequent use selected from the group consisting of a further processing stage, for utilization and for disposal in a landfill;
• separating components of the vapor which are non-condensable and insoluble in the condensate of the evaporable material by cooling and condensation of the vapor, and removing said non-condensable and insoluble components for a subsequent use selected from the group consisting of releasing into the environment, feeding to a deodorization stage and feeding to another gas purification process;
• adjusting the temperature of the fluidized bed, depending on the desired proportion by weight of the evaporable material in the solid material discharged from the fluidized bed, by adding solid material having a higher proportion by weight of evaporable material to the fluidized bed and removing dried solid material from the fluidized bed, so that said temperature of the fluidized bed corresponds to the boiling curve of the evaporable material in the solid material removed from the fluidized bed, so that the vapor removed from the fluidized-bed drier also contains gaseous substances of the evaporable material, other gaseous impurities and only gaseous components of the solid constituents of the solid material which are volatile below the boiling curve.