Abstract
The impact of different process variables on the thermal performance of a multi-effect boiling (MEB) falling film desalting process is investigated. The examined process variables include: number of effects, maximum brine temperature, inlet temperature of sea water feed, salt concentration factor (ratio of amount of sea water feed to reject brine), and the amount of fresh product. A rigorous analytical solution is first developed to interrelate the performance ratio with the different process variables. The analytical studies revealed that the performance ratio is highly dependent upon the number of effects and to a lesser extent upon the concentration factor. Variation of the maximum brine temperature and inlet feed water temperature has little effect on the performance ratio. For a constant concentration factor, the performance ratio is independent of the amount of fresh water product. The dependence of the total water production cost on the thermal performance ratio is also explored. Variation in performance ratio, plant capacity and energy cost considerably affects water cost.
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