| 摘要 |
PURPOSE:To enable a wear at a mil for crushing coal to be reduced and decrease a capacity of an applied motor for mil by a method wherein a degree of pulverization at the mil for a fine coal mil at a lower stage for sufficiently accomplishing a combustion is decreased as much as possible even in case that a staying time of flame in a furnace is long and a relative rough fine coal is applied. CONSTITUTION:The degree of pulverization at a mil 3a for supplying fine powder coal to the upper-most burner 2a is raised highest and in turn a degree of fine coal at a mil 3d for supplying fine powder coal to the lower-most burner 2d is decreased lowest, a degree of fine coal at mils 3b and 3c for supplying fine coal to the two intermediate stage burners 2b and 2c is decreased lower than or equal to that of the upper stage burners 2a and 2b or increased more than or equal to that of the lower stage burners 2c and 2d. As a practical method for varying a degree of pulverization in the mil, a degree of opening of vanes in a mil having fixed type classifiers and in case of a mil having a rotary type sieves, its number of rotation is varied.
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