Control method and device for pulverizing system

The invention discloses a control method and device for a pulverizing system. The method comprises the steps that the current operation mode of a coal mill is determined according to the opening number of exit doors; an allowable switching mode of the coal mill is determined according to the current operation mode and the allowable change value and the allowable minimum value of the opening number; if a switching instruction for a target switching mode is detected, the target switching mode belongs to the allowable switching mode, and the coal mill meets a target allowable condition corresponding to the target switching mode, the coal mill is switched from the current operation mode to the target operation mode corresponding to the target switching mode; and by changing the opening number of the exit doors of the coal mill and changing the operation mode of the coal mill, the pulverized coal concentration of remaining pulverized coal pipes can be improved on the basis of closing different numbers of exit door