Industrial Dryers

Techno Designs offers the most versatile Continuous Drying System for cohesive and non-cohesive filter press cakes or filter nutche cakes wherein solid content varies from 20 to 70 percent. Being a direct drying process, the material is suspended in the hot drying air. The system offers the advantages of a very low labour and handling costs.

PRINCIPLE OF SPIN FLASH DRYING

The Spin Flash Drying is more often in the line of an agitated fluidized bed system. The drying agitator works as rotor to break the lumps and the hot air enters at reasonably high velocities to give dynamic action to dryand disintegrate the product.

Fresh air is sucked through hot air generator, which can be direct, indirect in nature. The entry to the drying chamber is tangential to give whirling air suction across the dryer. The hot air generator can be Liquid, Solid or Gaseous Fuel fired. The feed screw pushes the material to the drying chamber. The drying chamber has a rotor driven from the bottom. The rotor has specially designed scrapper blades and disintegrator for breaking the lumpy mass into smaller fragments.

The lumps, which are broken by the rotor, start drying and simultaneously disintegrating in the stream of hot air.

The airborne fine powder particles get carried to the top of the drying chamber and a classifier classifies them to the required size. The particles with larger diameter go back to the chamber, while the fine travel through with the air for final collection through reverse pulse bag filters, wherein almost 100% powder recovery is achieved.

The Rotary Vacuum Dryers offered by us are a clean, simple and effective way to dry wet cakes, wet powders and slurries. These are used where either a solvent is to be recovered or the drying is to be carried out at relatively low temperatures for heat sensitive material. We manufacture our range using high grade material that includes C.S, SS 304 and SS 316. Available in different capacities, ranging from 50 liters to 16000 liters, these find application in industries related to dyes, pigments, agrochemicals, polymers, metal powders, herbal products, pharmaceuticals, food products and speciality chemicals.

Construction:

It contains a hollow shaft with specially designed hollow arms, which are heated by steam, hot water or thermic fluid; rotating in a centrally jacketed shell. The entire shell area is effectively covered by the specially designed scrapper arms. This scrapes the entire internal surface of the dryer, continuously moving, while the material remains in contact with hot surfaces for protracted periods of time. This helps in the reduction of the drying time, hence offering enhanced efficiency.

Operation:

After starting agitation, the feed is charged and vacuum is applied in RVD, dust catcher, condenser and receiver. Then the heating of the mass causes the vapors to evaporate, which is subsequently condensed and collected in the receiver. The recovery of the solvent is maximum, while the drying time is minimal. This is due to the higher heat transfer, vacuum and intensive mixing.

Optional features: 

• Breaker bar (for minimizing lump formation for particle size reduction)
• Nitrogen purging (for explosion proof environment)
• Stationary scrapper blades (for scrapping rotating agitator for highly sticky material)
• Sampling valve (for collecting samples during vacuum application)
• Flame proof motors (for ex-proof environment)