| 摘要 |
PURPOSE:To restrain the generation of NOx gas by a method wherein a recirculating gas for burning having low oxygen concentration is blown into the burning area in which finely divided powders are floating in the upper part space of a fire grate. CONSTITUTION:A recirculating gas 10 for burning having low oxygen concentration which is discharged from a heat exchanger 6 is blown toward an area 9 in which finely devided powders are floated and burnt. Thereby, the oxygen concentration in the area 9 is decreased, consequently, the generation of NOx gas can be restrained. |
