Rotary Vacuum Paddle Dryer

Working principle & application:

Rotary Vacuum Paddle Dryer is horizontal, mechanically agitated vacuum dryer, which gives low temperature drying, mixing and breaking effects simultaneously. The apply of vacuum is to lower the boiling point of water or solvents contained in wet material to be dried.

RVPD consists of a jacketed cylindrical vessel and a hollow rotor fitted with double-walled discs to considerably increase heating surface. Heating medium, such as steam, hot water or hot thermal oil, is forced to circulate both inside the jacket and hollow rotor to form heating surface.

Wet material is gravity fed into the drying chamber via the infeed port with screw feeder, then vacuum and heat are applied to reach the evaporation point of water or solvents contained in wet material. Meanwhile, the disc rotor rotates in different directions to completely mix, move and break the wet material for fast and uniform heat transfer. Moisture evaporates rapidly and is extracted as vapor by the vacuum pump. Tubular condenser is installed to recover the evaporated moisture. The drying process can be batch or continuous operation.

Rotary Vacuum Paddle Dryer is ideally suited for low temperature drying of wet powders, filter cakes, sticky pastes or slurry materials in various industries with the following special features:

• 1) Heat sensitive and/or oxygen sensitive
• 2) Contained solvents and need to be recovered
• 3) Hazardous and/or smelly wet materials (has to contain the release of pollutive substances)