Spray drying is a method in which systems technology is applied to the drying of materials. After atomizing the material in the drying chamber, in the contact with the hot air, the moisture evaporates rapidly, that is, the dry product is obtained. The method can directly dry the solution, emulsion and suspension into powder or granular products, omitting processes such as evaporation and pulverization. Through mechanical action, the material that needs to be dried is dispersed as fine particles as fog, and when it comes into contact with hot air, most of the water is instantly removed, and the solid matter in the material is dried into powder. The atomization methods of spray dryers mainly include pressure type, centrifugal type and airflow type. Pressure spray micronization device: there are two kinds of guide grooves with rotating liquid flow c, one is that the axis of the guide groove is perpendicular to the axis of the nozzle and does not intersect, and the other is that the axis of the guide groove forms a certain angle with the horizontal. Its purpose is to increase the turbulence of the solution when sprayed.
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