FLUIDIZED BED COMBUSTION APPARATUS

摘要

PROBLEM TO BE SOLVED: To reduce high temperature corrosion of a heat exchanger tube disposed in a heat recovery cell by circulating a heat medium alone to a heat recovery cell from a combustion cell. SOLUTION: In this fluidized bed combustion apparatus, the inside of a fluidized bed is divided into a combustion cell 10 and a heat recovery cell 12 by a division wall 17 made up of a cooling tube 14 branched off a down water pipe. The cooling tube is provided with fins 16 covering the upper part of the fluidized bed and an air column part and the fins have clearances so arranged to let a heat medium 11 pass but none of corrosive fuel. A partition plate is arranged to separate a wind box 21 provided at a lower part of the fluidized bed into a combustion cell side wind box and a heat recovery cell side wind box to address a load varying operation. Air nozzles of the wind box provided at the lower part of the fluidized bed are so arranged that the air nozzles below the division wall are made different in the direction of delivery or delivery speed from other air nozzles thereby varying the circulation volume of the heat medium.