Abstract
In order to mitigate performance deterioration of natural draft dry cooling system (NDDCS) in hot weather, a water spray system utilizing seasonal or reclaimed water is proposed for NDDCS in a 600 MW power plant. The performance of water spray air precooling and its effect on NDDCS are quantitatively evaluated by a comprehensive 3D numerical model via criterions of water evaporation efficiency (EE) and the relative improvement of heat rejection (RI). The results show that the uncontrollable ambient air humidity plays a dominant role in determining the performance of evaporation cooling aided NDDCS as compared to the controllable factors of water droplet size and injection distance. For low ambient humidity (40 °C, 20% RH), EE is generally over 95% and achieved RI is about 1.4%, and this relatively good cooling performance is insensitive to water droplet dimension or injection distance. For moderate ambient humidity, the effect of water droplet dimension and injection distance can be equivalent to that of air humidity, and a particular performance enhancement of NDDCS can be achieved by careful manipulation of the two controllable factors. However, the achievable enhancement by adjusting these two factors becomes less notable as ambient humidity further increases.
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