Abstract
Details of the mechanism of direct contact distillation are studied experimentally. Two separate streams of water of controlled mass rates and inlet temperatures are maintained through an evacuated enclosure, simulating a single stage direct contact evaporation-condensation unit. Before admission into the stage, the water is deaerated and the amount of residual dissolved noncondensable gases is determined by an oxygen analyser. The influence of noncondensable gases present in the gaseous phase upon performance of the distillation process is studied quantitatively. Apparatus developed for measurement of profiles of molar concentration of noncondensable gases above condensing surface is described. Measurements of concentration of noncondensable gases in distillation stage were performed. These indicate an increase in noncondensable gas concentration in the vicinity of condensing surface by a factor of 20. Geometrical location of suction intakes for elimination of noncondensable gases is shown to have a marked influence upon mass transfer performance. These experimentally determined trends are explained theoretically by an analysis of diffusion in the vapor-noncondensable gas mixture.
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