The open spray drying system for small spray dryer is relatively simple. air (or other heat carriers) are sucked by the blower through the filter and sent to the heater to be heated into hot air, which flows evenly into the tower through the hot air distributor at the top of the drying tower. The material liquid to be dried is sent to the air flow atomizer by the feed pump. When the droplets contact with the hot air, they are dried into granular products, which are continuously discharged from the cyclone at the bottom of the drying tower cone. The purified waste gas is discharged by the exhaust fan Extract and discharge into the atmosphere.