Coupling Study on Plume Abatement and Water Saving Performance for Dry-wet Cooling Tower

With the increasingly severeness of water saving, emission reduction and environmental protection, the dry-wet plume abatement cooling tower has been paid more and more attention. In this paper, a theoretical model was established to compute the variation of gas-water parameters through the heat and mass transfer process of the typical dry-wet plume abatement cooling tower. According to the variation of the air parameters in the mixing process between the exhaust moist air and the ambient air, the plume forming characteristics and evaporation water amount were calculated and analyzed, and the accuracy of the theoretical model was validated by comparing with the literature data. According to the typical acceptance test procedures for dry-wet plume abatement cooling tower, through the dry bulb temperature and wet bulb temperature curves, the maximum humidity curves, the fogging frequency curves and the tower plume indicator, the effects of water mass flow rate ratio through dry zone on the plume abatement, water saving and cooling characteristics of tower were analyzed, by combining the measured data of one real dry-wet plume abatement cooling tower. For the working conditions with louvers being full open, the higher the water mass flow rate ratio through the dry zone, the better the water-saving performance and the cooling performance of the studied tower, which provides guidance for the design and operation optimization of dry-wet combined cooling tower. © 2021 Chin. Soc. for Elec. Eng.