Abstract
In view of the problems of low heat and mass transfer efficiency in the evaporation process of seawater desalination and wastewater treatment, high gravity direct contact evaporation (HG-DCE) technology was developed to improve efficiency and performance of heat and mass exchange. Research platform of HG-DCE was designed, in which rotating packed bed was used as evaporator to study the evaporation process and characteristics of system, and the equilibrium evaporation temperature was theoretically analyzed and experimentally verified in this paper. The results showed that the temperature of both outlet gas and circulating water have a limit value named adiabatic saturation temperature, which proved the excellent heat and mass transfer ability. Furthermore, the effects of different factors on evaporation performance were studied. The amount of water vapor carried by air reached 44.8 g/kg and evaporation efficiency reached 80–90 %, which were much higher than other works. Evaporation intensity reached 1224 kg/(m3·h), which was 1–2 orders of magnitude higher than other evaporation systems. In conclusion, HG-DCE system greatly intensified the direct contact evaporation process to obtain high evaporation capacity and evaporation intensity, providing theoretical guidance and design basis for the application of high gravity technology in seawater desalination and wastewater evaporation.
Published Version
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