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Vacuum Rotary / Paddle Dryers provide fast, uniform, low temperature drying of press cake, filter cake, and slurry type materials requiring agitation and recovery of solvents during drying. The batch drying time depends on the composition, nature and amount of solvent present in the wet product.

VRD Model Sizes 60% Wet Charge Working Capacity Total Internal Capacity
2×4 VRD    7.3 cubic feet   10.6 cubic feet
2×8 VRD   14.5 cubic feet   21.2 cubic feet
3×10 VRD   39.3 cubic feet   63.0 cubic feet
3×20 VRD   78.6 cubic feet 130.0 cubic feet
4×15 VRD 100.6 cubic feet 139.6 cubic feet
4×20 VRD 134.0 cubic feet 187.0 cubic feet
5x15VRD 147.7 cubic feet 183.7 cubic feet
5×30 VRD 295.4 cubic feet 369.5 cubic feet
6×36 VRD 536.2 cubic feet 584.4 cubic feet

Product Details

Consisting of a stationary horizontal jacketed cylinder (vacuum chamber) designed for vacuum or pressure operation under controlled heat with an internal revolving agitator, which can be heated to further shorten drying time. The custom-select agitator mixes and circulates the product into contact with the heated surfaces to achieve uniform drying with minimum power consumption, tumbling, and dusting.

The batch operation of the vacuum rotary dryer is simplified by automatically loading (charging) the wet product into the top of the jacket cylinder with the agitator rotating for uniform distribution and complete dry product discharge through a pneumatically operated underside discharge door.

The jacketed cylinder and agitator are designed to meet the operating pressures and material compatibility requirements for each individual application and are built to comply with ASME, PED Pressure Codes or other national design and construction codes.

Due to hundreds of various types of products and demands of inducing and controlling a vacuum environment, almost all aspects of a vacuum rotary dryer’s mechanical design, operating components and ancillary support equipment can be customized to meet each individual’s process design application needs.

The vast majority of Buflovak vacuum rotary dryers are installed on a production-guaranteed basis because the specific process (chemistry) design was tested and then pilot-run in the Buflovak laboratory, which provided reliable scale-up data for correct dryer configuration and working capacity to meet each individual process design application.

The following chart is an example of the flexible vacuum rotary dryer capacity range to meet your specific dry product production rate. The length of any given rotary dryer diameter can be adjusted for exact volume requirements to meet and balance upstream and downstream design capacity.

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