冷却塔填料及非均匀配水协同优化研究

Synergistic optimization study of cooling tower packing and non-uniform water distribution

为提升冷却塔的冷却性能,以北方某300 MW机组冷却塔为例,建立冷却塔三维数值计算模型,对比二分区及三分区不均匀填料对出塔水温的影响,确定最优半径分界点,并协同非均匀配水进行优化,分析不同优化方案对出塔内空气流速、塔水温、通风量的影响。结果表明:二分区及三分区非等间距填料下出塔水温分别为31.798℃和31.696℃,冷却性能提升;非等间距填料与非均匀配水的耦合优化显著提高了空气动力和温度场的均匀性;随着内区配水量的增加,水温和通风量均呈现先增加后减少的趋势;最佳内区配水量为50.0%,出塔水温为31.360℃通风量7122.8 kg/s;与26 mm和30 mm等距填料布置相比,协同优化后,出塔水温分别降低了0.768℃和0.830℃,冷却性能显著提升。

In order to improve the cooling performance of cooling tower,this study takes a 300 MW unit cooling tower in the north as an example,establishes a 3D numerical calculation model of cooling tower,compares the effect of non-equal packing in two and three zones on the outlet tower water temperature,determines the optimal radius dividing point,and cooperates with non-uniform water distribution for optimization,analyzes the effect of different optimization schemes on the air flow rate,tower water temperature and ventilation volume in the outlet tower.The results show that the cooling performance is improved with the exit tower water temperature of 31.798℃ and 31.696℃ under the non-equally spaced packing in the second and third divisions,respectively.The coupling optimization of non-equally spaced packing with non-uniform water distribution significantly improves the uniformity of aerodynamic and temperature fields.With the increase of water distribution in the inner zone,the outlet water temperature and ventilation volume both show a trend of first increase and then decrease,and the optimal water distribution in the inner zone is 50%,and the outlet tower water temperature is 31.36℃ and ventilation volume is 7122.8 kg/s.Compared with 26 mm and 30 mm equidistant packing arrangement,after collaborative optimization,the water temperature of the tower is reduced by 0.768℃ and 0.83℃,respectively,and the cooling performance is significantly improved.