| 摘要 |
PROBLEM TO BE SOLVED: To reduce the depth of wear of evaporation tubes near the top surface of a lower refractory material in a circulation fluidized bed combustion furnace provided with the lower refractory material at a lower part of a wall surface thereof, on which a plurality of evaporation tubes are arranged. SOLUTION: A plurality of evaporation tubes 2 are arranged on the wall surface of this circulation fluidized bed boiler, and a lower refractory material is provided at a lower part of the wall surface. A nozzle 11 for blowing a gas toward the inside of a furnace is arranged between the adjacent generating tubes 2 above a stage 3' at the top surface part of the lower refractory material. Particles are concentrated on the evaporation tubes near the stage 3' by varying the accumulation height of the particles of fluidizing material by removing the particles accumulated on the stage 3' by a gas blown from the nozzle 11, thereby preventing a reduction in the thickness of the generating tubes 2 at specified points.
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