Alaqua
Alaqua - Rising Film Long Tube Vertical Evaporators (LTV )
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These operate on a “thermo-siphon” principle. Feed product enters the bottom of the heating tubes and as it heats, steam begins to form. The ascending force of this steam produced during the boiling causes liquid and vapors to flow upwards in parallel flow. At the same time the production of vapor increases and the product is pressed as a thin film on the walls of the tubes, and the liquid rises upwards. This upward movement against gravity has the beneficial effect of creating a high degree of turbulence in the liquid. This is advantageous during evaporation of viscous products and products that have a tendency to foul the heating surfaces.
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- Usually there must be a high temperature difference between the heating and boiling sides in this type of evaporator. Otherwise the energy of the vapor flow is not sufficient to convey the liquid and to produce the rising film.
- This type of evaporator is often used with product recirculation, where some of the formed concentrate is reintroduced back to the feed inlet in order to produce sufficient liquid loading inside the heating tubes. A number of different designs have been developed using this basic principle.