| 摘要 |
A furnace, especially a coal burning furnace, in which the coal to be burned is placed on a grate near the bottom of a combustion chamber. According to the invention, a fan, or blower, has the inlet and the outlet connected to conduits which lead downwardly at opposite sides of the furnace and turn inwardly into the combustion chamber and blow the flue gases back into the combustion chamber at about 3 inches above the flame center and slightly forward thereof to provide an over and under draft. The conduits extending downwardly from the fan, or blower, at the sides of the boiler preferably have clean-outs at the lower ends thereof, with doors, and solid particles entrained in the flue gas which drop out therefrom can thereby be removed from the conduits. Further, each conduit is preferably provided with a blowdown nozzle at the top to which compressed air can be supplied to blow down the conduit and thereby dislodge solid material that may accumulate therein during operation of the boiler.
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