Spray dryer is a kind of equipment that disperses liquid materials into tiny droplets through atomizer, contacts with hot air, quickly evaporates water, and forms dry powder. Its working principle is based on three steps: atomization, drying, and separation. During the atomization stage, liquid materials are dispersed into droplets of 10-200 μ m using pressure, centrifugal, or air flow atomizers; During the drying stage, droplets come into contact with hot air, causing rapid evaporation of moisture; During the separation stage, the dried powder is collected through a cyclone separator or bag filter.
In terms of performance characteristics, the spray dryer has the advantages of high efficiency, continuity and strong adaptability. Its drying speed is fast, usually only taking a few seconds to tens of seconds to complete the drying process. For example, the evaporation intensity of a certain model of spray dryer can reach 5-30kg water/m ³ · h. The continuous operation characteristics make it suitable for large-scale production, and its strong adaptability is reflected in its ability to handle various liquid materials, including solutions, suspensions, and emulsions, and its protective effect on heat sensitive materials.
