Intelligent mill-load control for pulverizing system in alumina sintering process

The pulverizing system in alumina sintering process uses the air with residual heat produced by cooling clinker as the hot air to dry the coal powder.When the temperature of hot air is low and varies frequently,it may cause an overload condition for the pulverizing system,leading to operational faults of"coal blockage"and even the termination of the mill operation and the operation of mill-load controller.To deal with this problem,we propose a rule-based reasoning switching mechanism which switches between the PI controller for normal load and the controller for overload.This method has been applied successfully to a pulverizing system for alumna sintering process,in which the pulverizing system is controlled to generate the maximal output power when the temperature of hot air is low and varies frequently,thus,avoiding the fault of"coal blockage".