Fluidized-bed combustor

Furnaces – Refuse incinerator – Refuse suspended in or supported by a fluid medium

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Details

34 57A, 122 4D, F23D 1902

Patent

active

041300718

ABSTRACT:
A coal-dolomite mixture is ground into particle-sized bits and fed into a downward sloping duct beneath the distributor plate in a fluidized-bed combustor. High velocity air is introduced through ports spaced at intervals along the bottom of the duct, thereby entraining the mixture in an air stream. The air and entrained solid is guided upward into a slot-like chamber which passes through the distributor plate and opens into the fluidized bed a distance above the plate. Vanes in the duct and chamber and baffles above the chamber exit control the flow of the air and entrained solids so that the coal-dolomite mixture is evenly distributed throughout the fluidized bed. The distributor plate is covered with a layer of high temperature alumina stones graded in size, with the coarse stones in closest contact with the plate and the fine stones on top, thereby shielding the plate from the high temperatures of the combustion zone and preventing the weeping of hot and ash burning coal particles onto the plate. The stones are large enough so that they do not fluidize.

REFERENCES:
patent: 2723838 (1955-11-01), Peters
patent: 2835483 (1958-05-01), Lindsay
patent: 2997031 (1961-08-01), Ulmer
patent: 3863359 (1975-02-01), Grega
patent: 3981690 (1976-09-01), Chen et al.

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