During the severe cold winter operation of the power units with heat supplying and wet cooling tower

water icing is easy to occur under low heat load work conditions such as deep peak regulation and large extraction heating load. Traditional anti-freezing measures are difficult to respond quickly to the anti-freezing requirements of the power unit

and cannot achieve accurate adjustments

resulting in reduced energy efficiency of the power unit. Therefore

this study establishes a three-dimensional numerical model for the wet cooling tower with two-layer louvers under constant heat load. It explores the regulation mechanism of the two-layer louver installation on the water temperature distribution characteristics of the key surfaces such as the bottom layer of packing and the surface of the water pond

combined with the engineering reality of the wet cooling unit operating in severe cold areas in winter with outer ring water distribution. The results show that compared to whole tower water distribution

the outer-ring water distribution can increase the minimum water temperature on the water pond surface by 10.20~13.90℃

then eliminating the risk of freezing effectively. When the ambient temperature further decreases and the outer ring water distribution cannot meet the anti-freezing demand

the louver control can be activated in time

so as to increase the minimum water temperature

and then provide theory basis for the wet cooling tower anti-freezing and energy-saving louver control strategies.