Nozzle bottom arrangement for a dryer and a method for operating said dryer

摘要

The invention relates to a nozzle grid device (14) and to a method for operating the latter. The nozzle grid arrangement (14) has a nozzle group with first nozzles (15a) and a further nozzle group with second nozzles (15b). The two nozzle groups can be supplied independently of each other with a fluidizing medium. The respective volumetric flow can be switched on and off or can be adjusted variably. The first nozzles (15a) and the second nozzles (15b) are uniformly distributed over the entire surface of the nozzle grid arrangement (14). As a result, a homogeneous fluidized bed is produced in the fluidized bed dryer (10) irrespective of whether only one of the nozzle groups (15a or 15b) or all of the nozzles (15) is or are operated.