FURNACE STRUCTURE OF CIRCULATING FLUIDIZED-BED BOILER

摘要

PROBLEM TO BE SOLVED: To provide a furnace structure of a circulating fluidized-bed boiler in which interference of an upward gas flow with a downward gas flow is prevented or suppressed, and local wear of a water-wall generated near a bend portion is reduced as a result.SOLUTION: The furnace structure of the circulating fluidized-bed boiler is provided in which a furnace wall 1 formed by connecting a plurality of water-wall tubes 3 via fins 4 defines a combustion chamber 2, and a refractory material 5A is provided covering the lower inner surface of the furnace wall 1. In the furnace structure of the circulating fluidized-bed boiler, the furnace wall 1 includes a bend part 7 where the furnace wall 1 is bulged out to the furnace outside, at a transferring part to the refractory material 5A. The refractory material 5A having an upper end surface 5a formed in the furnace inside-side space of the bend part 7 is located in a lower part of the furnace, and the furnace inside-side end portion of the upper end surface 5a is located at the furnace inside center-side of a vertical line 8 drooping from the furnace inside surface of a fin 4 constituting the furnace wall 1 above the bend part 7.