Organic solvent Closed low temperature spray dryer

1. Introduction to Closed low temperature centrifugal spray dryer functions and principles
     The Closed low temperature spray dryer is specially designed for organic solvents, and uses an 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 closed-loop centrifugal spray system is specially designed.
     The closed-loop spray dryer developed by our company does not need to reach the boiling point for evaporation. As long as the alcohol in the outside air does not reach a saturated state, the alcohol can also evaporate at 30-40 degrees Celsius.
     Through this principle, our company has developed a set of closed-circuit spray dryers that can evaporate even in low temperature environments.
 2. Overall structure (subject to the supplier's final design)
     The equipment is mainly composed of: feeding system, heating system, atomization system, spray drying system, inert gas circulation system, product recovery system, and condensation system. Machine size: length < 1.6 meters, width < 1.2 meters, height < 1.6 meters;
     2.1. Feeding system
     The feeding system includes: batching tank, solvent tank, feeding peristaltic pump, feeding pipeline and atomizer. First, the prepared slurry is put into the batching tank, and after stirring evenly, driven by the peristaltic pump, the slurry passes through the pipe. The road valve reaches the atomizer, and the atomizer needs to be equipped with a special explosion-proof atomizer nozzle, and the nozzle life is guaranteed for one year.
     2.2. Heating system
     The heating system is composed of a nitrogen-electric heating system. The closed heating element directly heats the drying medium (nitrogen) in the pipeline and passes through a set of pressure regulating control devices. The temperature control accuracy is within ±2°C, and the maximum temperature of the heater is 110° C.
     2.3. Drying tower
     The drying tower includes: tower body, explosion-proof lighting, gas distributor, temperature control equipment, pressure relief device, air inlet pipeline, air outlet pipeline, oxygen content measurement sensor and other components, and a filter device needs to be installed inside the air inlet pipeline; The atomized slurry is heated by hot air, and the slurry is volatilized and dried to become a discharge port where the powder falls to the bottom, and the gas is discharged from the exhaust pipe for a closed-circuit circulation pipeline. The material of the drying tower: 304 stainless steel.
     2.4. Product recycling system
     The gas discharged from the bottom of the drying tower contains powder and organic solvent vapor, which is recovered by a filter device, the powder and organic solvent gas are separated, the powder is recovered, and the organic gas enters the condenser for recovery and reuse.
     2.5. Gas circulation system
     The gas circulation is completed by a set of circulating fans. The drying medium is output from the circulating fan, flows through the condensing device, electric heater, drying tower, cyclone separator or bag filter, and then returns to the circulating fan for repeated use, that is, a gas circulation system is formed.
     2.6. Condensing system
     The condensing system consists of a refrigeration unit, a condenser, a refrigerant circulating pump, a filter, a heat exchanger and a connecting pipeline. The "wet" gas (including evaporated organic solvent vapor) discharged from the dust collector enters the condenser, and the gas is cooled and deliquored by the condenser and returned to the gas circulation system. The device is automatically discharged into the solvent tank, and the condensing temperature is less than or equal to 12°C.