Air-drying method for repairing ancient books

1. uneven feeding and excessive fluctuation; 2. There is aggregate or shell in the preheater; 3. Improper air intake coordination of the system (low air consumption); 4. Preheater flap valve is not flexible; 5. Excessive fuel fluctuation; 6. Inappropriate diffusion devices; 7. The air leakage of the preheater system is large. Will cause the phenomenon of rotary kiln erosion.