核电厂海水冷却塔填料安装方式研究

Installation Method of Seawater Cooling Tower Packing in Nuclear Power Plant

为开展核电厂超大型海水冷却塔的塔芯优化,采用物理模型试验方法,测试了搁置式、玻璃钢托架悬吊式和穿杆悬吊式3种填料安装方式下的热力阻力性能。结果表明,采用玻璃钢托架悬吊式和穿杆悬吊式安装方式的填料,其换热效果和通风阻力均要优于搁置式。以某滨海核电厂海水冷却塔为例,对3种填料安装方式下的综合冷却性能进行了工艺计算对比,结果表明穿杆悬吊式的冷却效果最优,对比搁置式出塔水温可降低约0.7℃,或同样出塔水温下淋水面积可减少约1 900 m2,能够提高经济性和建造的可行性。考虑到防冻、国产PVC填料材质水平及核电厂对稳定性和可靠性的特殊要求,推荐玻璃钢托架悬吊式作为优选方案。

In order to optimize the core of super large seawater cooling tower in a nuclear power plant,thermal resistance performance of three packing installation modes(shelving type,FRP bracket suspension type and through rod suspension type)was tested by physical model test method.The results showed that heat transfer efficiency and ventilation resistance of the packing with bracket suspension and through rod suspension were better than those of the shelving type.Comprehensive cooling performance of three packing installation methods in a seawater cooling tower of a coastal nuclear power plant was compared.The results showed that the cooling effect of the through rod suspension type was the best.Compared with the shelving type,the water temperature could be reduced by about 0.7℃,or the drenching area under the same outlet water temperature could be reduced by about 1900 m2,which improved the economy and construction feasibility.Considering antifreeze requirements,domestic PVC packing material quality and special requirements of stability and reliability in nuclear power plants,the bracket suspension type is recommended as the preferred scheme.