The rotary vacuum dryer (paddle dryer) is a horizontal jacketed cylinder with a slowly rotating internal agitator. Drying under vacuum lowers the boiling point of moisture and solvents, so heat-sensitive products can be dried at low temperature, and evaporated solvents can be recovered through a condenser and receiver.
It handles wet cakes from centrifuges and filters, pastes and slurries. Heating media can be steam, hot water, hot oil or thermic fluid in the shell, end covers and shaft.
Working principle
Heat is transferred by conduction from the heated shell, end covers and agitator to the product. The agitator continuously renews the product in contact with the heated surfaces, while vacuum removes the vapour, which is condensed and collected in the receiver.
Technical specifications
Machine Range
Gross volume
100 – 20,000 L
Typical wet load
40 – 45 % of gross volume
Drive
5 – 75 HP
Heating temperature
30 – 300 °C
Heating media
Steam / hot water / hot oil / thermic fluid
Need a different size or material? Specifications are for standard models; we build to your capacity and process.Ask for a custom size
