Overview

In order to meet the needs of the market, our company, on the basis of absorbing and digesting the advanced technology and experience of similar foreign products, combined with our company's technology of producing spray drying equipment for many years, through repeated demonstration and experimental research, determined the design plan and manufacturing process of BLPG series closed cycle centrifugal spray drying units. After material test verification, the development was successful, and was welcomed by the user units after being introduced to the market.

Closed cycle centrifugal spray drying unitIt is a specialized equipment for drying organic solvent slurry. The unit uses nitrogen (or other inert gas) as the drying cycle gas, which prevents oxidation of the materials during the drying process and recovers organic solvents. The closed cycle spray drying unit is generally used for drying the powder of slurry prepared by organic solvents such as ethanol, acetone, hexane, etc. The equipment is explosion-proof, and the drying process is safe and environmentally friendly.

working principle

The closed cycle centrifugal spray drying unit works in a closed environment. The drying medium is inert gas, usually N2, which is suitable for drying materials containing toxic gas or materials prone to oxidation during the drying process; The system uses inert gas as the circulating gas, which has a protective effect on dry materials. The circulating gas undergoes processes of moisture loading and dehumidification, and the medium can be reused;

After being heated by a heater, nitrogen enters the drying tower, and the liquid material is transported to the centrifugal nozzle by a screw pump. The liquid is atomized into droplets by a high-speed rotating atomizer, and the heat and mass exchange process is completed in the drying tower. The powdered material after drying is discharged from the bottom of the tower. The evaporated organic solvent gas, under the negative pressure of the fan, condenses the dust trapped in the gas through a cyclone separator and a spray tower, and the saturated organic solvent gas is condensed into liquid and discharged from the condenser. The non condensable gas medium is continuously heated and reused as a drying carrier in the system. The drying medium in the drying system is N2, and the internal operation is under positive pressure to maintain a certain positive pressure value. If the internal pressure drops, the pressure transmitter will automatically control the N2 inlet to ensure system pressure balance.

Features of the equipment

1. The dryer adopts a micro positive pressure design scheme to prevent oxygen-containing ambient air from entering the tower. The main fan adopts special sealing components and cooling measures to maintain a sealed state during high-speed operation.
2. Nitrogen is used as the heating cycle gas in the system to keep it running in a low oxygen or micro oxygen state at all times.
3. Using programmable control method, the control system operates at low voltage. When the pressure inside the system exceeds the set value, the actuator immediately opens and releases pressure to ensure safe operation.
4. By adopting advanced solvent recovery technology, the dried solvent gas is fully recovered, which not only saves equipment and operating costs, but also avoids the pollution of organic gases to the environment. The solvent recovery rate can reach over 95%.

Scope of application

1. The raw material liquid is composed of solids and organic solvents;
2. Require complete recovery of organic solvents;
3. Dry and toxic solid powder products;
4. Do not allow odors, solvent vapors, and particulate matter to escape (to prevent pollution to the environment and atmosphere);
5. When dust may form explosive mixtures in the air;
6. When there is a risk of explosion and combustion in the solvent of the boiler;
7. During the drying process, dust is not allowed to come into contact with oxygen.

This unit is suitable for industries such as pharmaceuticals, chemicals, food, and lithium battery materials where oxidation prevention is necessary during the drying process and high consistency of the powder after drying is required. The average particle size of 10-100 μ m can be obtained by centrifugal spray. Of course, the entire drying process is completed under nitrogen protection, and organic solvents can be recovered simultaneously.