FURNACE WALL STRUCTURE FOR FLUIDIZED-BED BOILER

摘要

PROBLEM TO BE SOLVED: To reduce the wear and thickness decrease of a water tube at a water cooled wall. ;SOLUTION: The water cooled wall 21 of a furnace is constituted by many tubes 22 arranged at a predetermined interval in the longitudinal and lateral directions of a boiler and extended substantially perpendicularly toward the upward or downward direction and fins 23 for connecting the adjacent tubes 22. The each tube 22 has a large-diameter part 22a at the upper part, a small- diameter part 22c at the lower part, and a tapered swaged part 22c reducing in the diameter toward the downward direction between the part 22a and the part 22b. The upper end of a refractory material 24 lined on the inside of the wall 21 is disposed near the lower end of the part 22b, and a gradient gradually reducing in thickness toward the upper end is provided at the upper end of the material 24.;COPYRIGHT: (C)1997,JPO