Working principle

　　The closed cycle spray drying system works in a closed environment. The drying medium is inert gas, generally N ₂, which is suitable for drying materials containing organic solvents, toxic gases or materials prone to oxidation during drying; The system uses inert gas as the circulating gas, which has a protective effect on dry materials. The circulating gas undergoes the process of carrying and removing moisture, and the medium can be reused; Nitrogen enters the drying tower after being heated by the heater. Liquid materials are transported to the centrifugal nozzle through the screw pump. The liquid is atomized into droplets by the high-speed circulating atomizer. The heat and mass exchange process is completed in the drying tower. The dried powdery materials are discharged from the bottom of the tower. The evaporated organic solvent gas passes the dust trapped in the gas through the cyclone separator After dust removal in the spray tower, the saturated organic solvent gas condenses into a liquid and is discharged from the condenser. The non condensable gas medium is continuously heated and used as a drying carrier for recycling in the system. The conventional conventional centrifugal spray drying achieves the purpose of moisture removal through continuous air supply and exhaust, which is also an obvious difference between explosion-proof closed centrifugal spray drying equipment and conventional centrifugal spray drying equipment; The drying medium in the drying system is N ₂, which is operated under positive pressure internally to maintain a certain positive pressure value. If the internal pressure drops, the pressure transmitter automatically controls the amount of N ₂ input to ensure system pressure balance.

Structural diagram

Dry powder recovery rate: ≥ 95%

Residual solvent of the product: ≤ 2%

System oxygen content: ≤ 500PPM

Electrical riot prevention: EXDIIBT4

Equipment system: positive pressure state