Abstract
Multi-stage flash distillation and multiple effect boiling distillation are not entirely different processes, but the two ends of a continuum. The defining variable in the continuum is the rate of brine circulation relative to distillate product. The multi-stage flash “end” is characterised by morphological simplicity as compared with the MEB end which is morphologically complex. This simplicity is obtained at the cost only of increased circulation, i.e. pumping power. No water cost improvement is obtainable from the MEB system except by increasing performance ratio well beyond that achieved by multi-stage flash up to date. Multi-stage flash systems can be designed to give higher performance ratios also, and it is to this end that effort should be directed with greater acumen All argument for reversion to the MEB system is based on the assumption that in the VTE film boiling embodiment assured high heat transfer coefficients can be obtained and maintained in practice.
Published Version
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