A bed plate for a fluid bed dryer, said bed plate having a plurality of gas distributing openings defined therein, the openings of the bed plate being arranged in pairs of substantially oppositely directed openings, the area of one of the openings in each pair exceeding that of the other, a depressed portion of the plate extending between the openings of each pair.
Product Reclamation In A Fluid Bed Dryer
A fluid bed dryer utilizing a rotating air distribution disc to deliver rotating streams of air to the fluid bed includes salvage apparatus which accumulates, concentrates and returns particulate material which falls from the fluid bed during the drying operation to the fluid bed. A salvage ring is mounted below and completely encircles the disc to receive and accumulate particles of material which fall from the fluid bed to the disc and are flung from the disc by centrifugal force. A collector which is positioned within the salvage ring and driven by the disc, sweeps the internal area of the salvage ring to concentrate the accumulated particles of material and deliver them to a funnel which is connected to a passageway leading back to the fluid bed dryer. The collected particles of material are returned to the fluid bed by air pressure created by pressure differentials within the dryer apparatus.
A process for salvaging otherwise waste product in a fluid bed dryer for drying a particulate product by passage of a current of air through a fluidizing chamber to fluidize the particulate product to be dried and contained therein underfluid bed drying conditions, which includes passing a rotating current of air through the fluidized bed to maintain a rotating wave form therein by a rotating air apertured