| 摘要 |
PROBLEM TO BE SOLVED: To provide a combustion method for coal mixed fuel in a boiler that can improve the coal mixing rate of subbituminous coal to bituminous coal.SOLUTION: There is provided a combustion method for coal mixed fuel of a boiler using dust coal as mixed coal of subbituminous coal and bituminous coal obtained by crushing coal by a roller mill 2, the combustion method is characterized in that the coal mixing rate of the subbituminous coal to the bituminous coal is 50% or larger by adjusting Air[kg]/Coal[kg] as the ratio of the supply amount of primary air for drying supplied to the entrance side of the roller mill 2 and the supply amount of dust coal conveyed with the primary air and supplied into a furnace 1 together with the primary air via a burner 3 to a value exceeding a value Air[kg]/Coal[kg] under a reference condition as a condition which is optimum when dust coal of only the bituminous coal is burnt. |
