| 摘要 |
PROBLEM TO BE SOLVED: To surpress accumulation of ash in the vicinity of a manhole 13 situated in an auxiliary side wall 7 of a furnace 1. SOLUTION: By increasing a ratio of an air feed amount of a burner 2b, positioned on the side wall side, of a plurality of burners 2 situated in the direction of a furnace width of a pair of furnace wall surfaces 4 of the furnace 1 than that of a burner 2a situated on a furnace wall surface 4 situated near to a central, the gas flow velocity in the vicinity of a furnace side wall, in the vicinity of an auxiliary side wall, and in the vicinity of the wall surface of a rear heat transfer part can be increased to a value higher than a gas flow velocity at the central part of a gas flow passage surrounded by each wall. Therefore, a gas speed 22 in the vicinity of the auxiliary side wall on the bottom wall of the auxiliary side wall is higher than that at the central part of the bottom wall of the auxiliary side wall, and an accumulation amount 24 of coal ash, produced by combustion of coal, in the vicinity of an auxiliary side wall 7 at the bottom wall of the auxiliary side wall is reduced than a conventional accumulation amount.
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