Airflow drying adopts parallel flow operation of material and gas, so the material temperature and air temperature can reach a reasonable state from the beginning to the end.The drying time is short, and the thermal efficiency is high, so a higher drying temperature can be used. Moreover, the rotary dryer also has the characteristics of wide application range, simple operation, stable operation, low energy consumption and high output. The use of this equipment can achieve the best economic benefits with the smallest investment, the lowest energy consumption, the fastest speed, the least manpower and space.