The device is especially for organic solvents, and uses the inert gas medium formed by circulating nitrogen to replace the usual air medium for spray drying. In addition to recovering products, organic solvents can also be recovered. According to the relevant characteristics of organic solvents, a set of closed cycle spraying system is specially designed. The new equipment developed by our company does not necessarily need to reach the boiling point for evaporation. As long as the alcohol in the external air is not saturated, the alcohol can also evaporate at 30-40 degrees Celsius. Based on this principle, our company has developed a set of closed cycle spray dryers that can evaporate in low temperature environments.