For the finest confirmation of diluted stream performance, use the Rising Film Evaporators. They have simple building ideas yet offer cost-effective solutions to their customers. The fluid is treated within the tubes, which are equipped with the shell-sided heating medium. The feed liquid enters the evaporator from the bottom head and ascends the tubes. On the shell side, heating media are present to function as a heat source. They are basic in design yet extremely effective in delivering exceptional results to their consumers.
For a wide range of applications, Alaqua provides rising film evaporators, along with different types of evaporators and other processing equipment. Our solutions guarantee that our clients are satisfied.
Rising tube evaporators find diverse applications, including effluent treatment, polymer manufacturing, food production, thermal desalination, medicines, and solvent recovery. “Large Long-Tube Evaporators for Seawater Distillation,” – Aschner, F.S., Schaal, M., and Hasson, D., 1971. Rising tube evaporators in these sectors act as reboilers or pre-processors, removing volatile components before stripping.
Rising tube evaporators desalinate seawater by heating with steam in long tubes, causing vapor to rise at lower temperatures in a vacuum.
Food processing and juice concentration-
The food business requires handling delicate goods that are vulnerable to high temperatures for the long term. Rising film evaporators can work fast and efficiently enough to prevent the product from being exposed to high temperatures that might harm or compromise its quality. So, they suitably function as concentrators in the food sector for juices, milk, and other dairy products that demand careful handling.
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Advantages and Limitations:
Low residence time-
In comparison to other evaporator designs, such as plate-type evaporators, the major benefit of the rising film evaporators is the short residence time of the liquid feed in the evaporator. Operating at higher temperatures ensures good product quality despite heat sensitivity. Continuous processing in the evaporator saves energy and time over batches.
Coefficients of heat transfer:
The comparatively high heat transfer coefficient of this evaporator type is another important benefit. This is important because it lowers the evaporator’s initial capital cost by reducing the overall heat transfer surface required. Accessible components with customizable designs make shell-and-tube systems cost-effective for basic evaporation, enhancing their suitability for construction. Furthermore, this sort of evaporator may readily accommodate foaming product vapor separators, which are commonly accessible.
Research indicates rising film evaporators, though efficient, may be less so than vertical or horizontal tube falling film evaporators. As a result, falling film evaporators have largely replaced rising film evaporators in recent years since they offer similar benefits while also being more efficient. Furthermore, rising film evaporators require a driving force to move the film against gravity, which imposes a constraint since the driving force requires a significant temperature differential between the heating surfaces.
Limited Product Flexibility:
Another significant drawback of rising film evaporators is the necessity for low-viscosity and low-fouling materials. Plate-type evaporators handle viscous liquids better due to easily accessible interior sections for cleaning and maintenance, reducing fouling issues.