Indirekt beheizter wirbelschichttrockner

Abstract

The invention relates to a method for generating process steam by burning dried lignite in a steam generator, comprising the drying of moist lignite in a fluidized bed dryer (1) with internal heat exchanger units (2) through which a heating medium flows, wherein at least some of the water is driven out of the lignite and removed from the dryer as vapors., dust is removed from the vapors in a dedusting device and the dried lignite is cooled in at least one cooler (6) arranged downstream of the fluidized bed dryer (1). The method according to the invention is distinguished by the fact that the brown coal dust occurring in the dedusting device is brought into direct contact with the dried and cooled lignite. (Figure 1)