Agitated Thin Film Evaporator Dryers

Agitated thin film evaporators are attractive for the concentration, distillation, stripping or deodorization of liquids in broad variety of chemical-process-industries (CPI) applications where the process streams are temperature sensitive (and must have only brief exposure to heat), viscous, or tend to foul or foam.
A vertical thin-film evaporator consists of two major assemblies: a heated body and a close-clearance rotor. The process fluid enters the unit tangentially above the heated zone, and is distributed evenly over the inner surface of the body wall by a distribution ring mounted on the rotor. The rotor blades spread the product over the entire heated wall, and generate highly turbulent flow conditions in the thin layer of liquid. The product spirals down the wall, while the turbulent conditions developed by the rotor blades generate optional heat flux, rapidly evaporating volatile components. The resulting vapours flow upward through the unit into a centrifugal separator, which returns entrained droplets or froth directly back to the heating zone. Clean vapours pass through the vapor outlet ready for condensing or further processing. Meanwhile, the concentrated liquid stream or dried powder leaves the evaporator / Dryer through its bottom conical outlet. Continuous washing by the bow waves generated by the rotor minimizes surface fouling of the thermal wall, where the concentrated liquid or residue is most prevalent.

• Once step drying can eliminate number of steps like pre-concentration, filtration or centrifugation in some kind of slurries with same thermal efficiency.
• Feeds can be processed without pre-concentration or dilution; Drying or concentration cost is mot economical in case of recirculation of vapours through TVR / MVR.
• Indirect heating and drying in absence of air eliminates oxidation of products. Particularly effective for heat, light and oxygen sensitive products. Best suited for solvent bearing products for complete solvent recovery.
• Best suitable for heat sensitive products due to its quick processing time.
• Operation can be under vacuum and under low temperature to protect heat sensitive products properties.
• Thermal efficiency can exceed 90%, Probably the most energy efficient dryer in the market.
• Intense agitation suppresses fouling, keeps heat transfer surface clean for continuous heat transfer with almost same thermal efficiency.
• Excellent turn down capability
• Low product holdup, ideal for hazardous applications
• Different rotor configurations to suit variety of applications with varying properties.