Verfahren zum erzeugen von prozessdampf

Abstract

The invention relates to an indirectly heated fluidized bed dryer (1) for drying moist, fine-grained bulk materials. The fluidized bed dryer (1) comprises a housing (2) with a gas-injection bottom (6) with built- in heat exchanger parts extending above the gas- injection bottom (6) and at least one discharge device, provided below the gasinjection bottom (6), for the dried bulk material. The fluidized bed dryer (1) according to the invention is distinguished in that the usable flow cross section of the housing (2) increases in the region of the built-in heat exchanger parts while the cross-sectional area of the housing remains the same over the height of the built-in heat exchanger parts in the direction of flow of the fluidizing medium. In this way, an inadmissible expansion of the stationary fluidized bed is reliably prevented. (Figure. 1).