Spray drying technology refers to the method of spraying to disperse the material in the hot air stream in a mist state. The material is in full contact with the hot gas, and the heat transfer and mass transfer process is completed in an instant, so that the solvent is quickly evaporated into a gas to achieve the purpose of drying. . The technology can eliminate unit operations such as evaporation, crystallization, separation and pulverization, and can be continuously and automatically produced, and the operation is stable. 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, which is suitable for drying the heat sensitive material. The product obtained by drying has good performance, the obtained microparticles are small, and the product has good fluidity and fast solubility. The disadvantage is that the dryer has a large volume and a low heat transfer coefficient, resulting in low thermal efficiency and high power consumption.