Ravi International – Rotary Vacuum Dryer Working Principle are as follows :-
- The Rotary Vacuum Dryer operates under the principle of rotational motion. The Rotary Vacuum Dryer is a cylindrical jacketed vessel with a central agitator having specially designed blades. A hollow shaft with suitable seals forms the drive connection to impart rotation to the dryer shell, thus allowing material to tumble inside it and also in contact with the heated surface of the inner wall.
- Temperature plays an important role in Rotary Vacuum Dryers operations; hence there is a temperature control mechanism provided for controlling temperature at the desired level as per requirements. Rotary vacuum dryers are most heat sensitive products processed at low temperatures up to 180°C resulting in excellent quality products with longer shelf life & lower energy consumption as compared to other methods such as spray/flash drying etc.
- The machines have a unique design that helps mix and agitate materials during the processing cycle, thus providing homogeneous blending. Excellent product results and high output capacity are comparable advantages experienced when using RVD’s compared to other equipment used for drying purposes in industry . The agitation helps efficiently proper drying process mechanism & helps break bonds formed between the particles on their surfaces aiding them in reducing viscosity & improving properties like solubility , particle size reduction & abrasion resistance of the end product.
- RVD proves beneficial in case of reactive compounds thanks to its low peak residence temperature that decreases the possibility of degradation or decomposition thus maintaining purity & quality. By setting specific rates & timing for feed rates / outlet valves / vacuum pumps etc. controls set according to stability of end products can be obtained .
- Yield depends on a lot of factors, but important ones being the degree of vacuum achieved, heating rate & duration at which the same temp is maintained.
3 theoretical cases exist:
- High yield- Material gets cool slowest
- Moderate yield- Material cooled at moderate speed
- Low yield – Cooling was too fast leading to reduced yield
Efficiency can be further increased by various means like continuous crust breaker, eliminating hot spots, insulated electrical heaters etc making sure best practices are followed. One should be able to select the most optimal condition based upon capacity requirement.
- Rotary Vacuum Dryers vary greatly in terms of design features right from internal components such as screw conveyor arrangement, cycle timer arrangement, nozzles configuring achievable vacuum levels, temperature range selection fluctuation prevention device selection. As they come in many shapes and sizes. it’s always better to select one keeping production goals, material characteristics usage, and smooth flow in mind otherwise latest models available on market.
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