Since ancient times, human beings have been accustomed to using natural heat sources and natural ventilation to dry materials, which are completely restricted by natural conditions and have low production capacity. With the development of production, they are gradually replaced by artificially controllable heat sources and mechanical ventilation and dehumidification.
In the early 20th century, spray dryers began to be used in dairy production, providing a powerful tool for drying liquid materials on a large scale. Since the 40s, with the development of fluidization technology, high-strength, high-productivity boiling beds and airflow dryers have appeared one after another. Cryosublimation, radiation, and dielectric dryers offer new means of meeting special requirements. In the 60s, far-infrared and microwave dryers began to be developed.
