Fluidized bed combustion apparatus and method of carrying out fluidized bed combustion.

摘要

The invention includes the steps of, and suitable apparatus for, maintaining a plurality of relatively dense beadlike particles (74) of inert solid material dispersed throughout the fluidized combustion bed (16), for circulation through heat exchange means separated from the combustion bed (16) and return to the fluidized bed (16) along with other bed constituents. Fine limestone particles may also be introduced into the combustion bed (16) along with fresh fuel particles. The circulating bed constituents are discharged from an arched heat exchange outlet to direct the returning bed constituents in a generally horizontal direction directly over the combustion bed (16) for generating increased circulation in the bed. In addition, the inlet (34) for introduction of fresh fuel and fine limestone is located just below the arched discharge channel (64) to enhance horizontal discharge velocity. A portion of the combustion chamber generally opposite the arched discharge channel (64) is provided with a sloped wall segment (70) to further enhance circulation within the bed (16).