Abstract

The methods of scale control used in MSF evaporators, namely sodium polyphosphate, acid dosing and organic polymers are reviewed. Temperature limitations, scale control performance and plant corrosion are discussed for each method. It is shown that unit water costs reduce with increasing brine temperature and that organic polymers are now competitive with acid dosing. Recent developments in scale control for MSF and other evaporation processes are briefly discussed, including sulphate ion exchange, fluidized bed evaporators and the use of surfactants.

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