Spray drying technology refers to the method of spraying, so that the materials are dispersed in the hot air flow in the state of mist droplets, the materials are fully in contact with the hot gas, and the process of heat and mass transfer is completed in an instant, so that the solvent is quickly evaporated into gas to achieve the purpose of drying . This technology can eliminate unit operations such as evaporation, crystallization, separation and crushing, and can be produced continuously and automatically with stable operation. With this drying method, the gas-solid two-phase contact surface area is large, and the drying time is short, generally 5 to 30 seconds, suitable for drying heat-sensitive materials. The product obtained by drying has good performance, the available particles are small, and the product has good fluidity and instant solubility. The disadvantage is that the dryer has a large volume and a low heat transfer coefficient, resulting in low thermal efficiency and large power consumption.