Abstract
This paper presents 5 different configurations of countercurrent grouping feed of the low temperature multi-effect distillation (MED). Mathematical models are developed for all the configurations. These models are used to study the effect of all the different feed configurations on the gain output ratio (GOR), spray density, specific heat transfer area, brine discharge salinity, and specific power consumption. Results indicate that for the MED system with large number of effects (10 effects or more), 3 or 4 groups of feeding method is preferred. Compared with the conventional way of countercurrent grouping feed configuration, the higher GOR, the smaller specific heat transfer area and the lower salinity of brine discharge could be expected in the partially mixed brine feeding mode. For the 11-effects MED design with the installed capacity of 25,000m3/d, the best feed configuration is 3 groups with partially mixed brine countercurrent grouping feed mode.
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