Abstract: In the water cooling towers of 300MW units, more advanced central shaft siphontype water distribution mode was adopted mostly. However, the practical effect of this water distribution mode was unsatisfactory; when the circulating pump is operating with high speed, the siphon can not be realized effectively, and the cooling effect of the circulating water was affected. At overhaul of unit No.3 in Huadian Tengzhou Xinyuan Thermal Power Company Limited, the siphon type water distribution mode of the water cooling tower had been reformed. The hoist gate type water distribution mode was adopted, and water distribution for full tower by single circulating pump was realized, which ensures the safe, stable and economical operation of the water cooling tower under various conditions.

Key words: water cooling tower, central shaft, reformation, hoist gate, water distribution mode