Solid fuel boiler and method of operating combustion apparatus

摘要

There is disclosed a solid fuel boiler including a plurality of solid fuel burners (5) and a furnace wall (25, 26) to perform horizontal firing; a duct through which a part of combustion exhaust gas recirculates to a furnace (3) from a downstream side of the furnace (3); heat tubes (8) (38) disposed on a furnace wall and area (7) of the furnace (3); and ports (9) via which the recirculation to a reducing flame portion of the the furnace (3) without combining the gas (9) with a flame in the vicinity the burner (5), so that molten ash is firmly sticking to the furnace wall fuel NOx, and unburned carbon. <IMAGE>