The Ravi International – Rotary Vacuum Dryer Advantages and Disadvantages. Rotary vacuum dryer is a cylindrical or cone vessel integrated with jacketed or limpet coil and rotated by a hollow shaft. Basically this is used for a batch operation plant. The complete drying of the product is done by combination process of under vacuum, stirring / agitation and consistent heating is through a jacket. It is an efficient method that offers a drying of the slurry product with quality. Generally this dryer is designed to remove moisture content from product materials under consistent heat and vacuum.
The following are Rotary Vacuum Dryer Advantages and Disadvantages
Advantage of Rotary vacuum dryer :-
- Efficiently heat transfer
- Uniform drying process
- Good solvent recovery capacity
- Less time cycle time for one batch process.
- It is power consumption and useful for cost reduction.
- Less hazards at the workplace because of the closed system process.
- Low pressure and temperature drying processing of highly toxic materials
- No degradation of dry product due to over-exposure, more temperature and time.
- Automated discharge of product with condenser of moisture and recovery of solvents.
Disadvantage of Rotary vacuum dryer :-
- More complex system arrangement
- Mechanical seal is a expensive part of the system
- Specialization required for design, process and operation
- Leakage of steam is a big issue due to rotating and static parts
- Vacuum build up and agitation in running condition is a critical task
Special Features of RVD :-
- Available with Direct drive and belt drive and Available with Mechanical seal arrangement
- Available Pulse jet dust filter arrangement and Sampling valve and Breaker bars arrangement
- Product temperature and vacuum probe arrangement and Rotor Types: Paddles or Helical Ribbon.
- Heating Surfaces: Shell, End Covers, and Shaft and Heating Media: Steam, Hot Water/Oil, Thermic Fluid.
- Suitable for drying heat sensitive material, as low temperature for drying can be maintained by high vacuum.
- Higher Thermal Efficiency. Almost 100% recovery of solvents.
- Heating Temp.: From 30°C to 300°C.
- Limpet coil could be provided instead of jacket if the heating media is fluid.
- The Evaporation Rate 4-12 Kg/H/Sq.m approx of heating surface area of water at heating temperature of 100°C.
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