Abstract
The formation of calcium sulphate scale in Vertical Tube Evaporators (VTE) of the falling film type has been investigated in a single tube experiment using fluted tubes. It was found that the scaling threshold is dependent not only on the brine concentration and temperature, but also on the heat flux to the evaporating film. With normal sea water concentrations and a high heat flux, scale was observed at 240°F (115°C), whereas with a low heat flux scale-free operation was possible at 266°F (130°C). The effect of heat flux is attributed to the presence of local areas of high concentration in the falling film which form as a result of uneven evaporation from the film. A simple model has been developed to explain the results.
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