Equipped with hot air transition furnace and RS410 Riyadh burner to complete the transition from coal to gas. The three-pass dryer is the equipment developed by the company supporting the drying system. Compared with the imported equipment, the investment is low: the thermal efficiency of the traditional single-pass dryer is increased by more than 45%, and the floor area is reduced by more than 50%. Real investment saving and high efficiency: It solves the difficulty of sealing, and can meet user requirements in the control of terminal moisture, easily adjust the required terminal moisture, and the discharge temperature is low.