Patent ID: 6814571
Filing Date: 2004-11-09
Classification: C22B,F23C,F27B,F27D

Abstract:
An arrangement to reduce build-up in a roasting of fine-grained material in a fluidized bed furnace, said arrangement comprising a gas distribution unit situated in the lower part of the furnace, connected to a plurality of primary jets, via which gas is fed through the bottom of the grate into the fluidized bed space, into which fine-grained solid material is fed via a feed unit located in a furnace wall and made to fluidize, said furnace wall being equipped with an overflow aperture for calcined material and with a discharge aperture located in the upper part of the furnace, the part of the grate beneath the fine-grained material feed point being equipped with a plurality of secondary gas jets, which are connected to a separate gas feed line and the number of secondary jets at the feed grate point being at least 5% of the number of primary gas jets in the feed grate area.