带冷却塔的循环冷却水系统泵房前池涌波分析

Surge Analysis of Pump House Forebay in Circulating Cooling Water System with Cooling Tower

对带冷却塔的循环冷却水系统事故停泵工况下,冷却塔集水池水位变化对泵房前池涌波的影响进行研究,推导循环冷却水系统非恒定流方程,求得水泵完全停泵下泵房前池波涌最高水位及第二振幅的解析解,并采用有限差分法对进行泵房前池波涌的历时过程进行分析研究。计算结果表明:常规设计情况下,不可忽略冷却塔集水池内水位变化对泵房前池涌波的影响;冷却塔内集水池中的水位波动降低了泵房前池的最高涌波值,增加了第二振幅值,减小了波动周期。

In this paper,the influence of the water level change of the cooling tower sump on the surge in the forebay of the pump house is studied under the condition of pump shutdown in the circulating cooling water system with cooling tower.The unsteady flow equation of the circulating water supply system is deduced,and the analytical solution of the maximum water level and the second amplitude of the surge in the forebay of the pump house under the condition of complete pump shutdown is obtained has carried on the analysis research.The results show that:in the conventional design,the influence of the water level change in the cooling tower sump on the surge in the forebay can not be ignored;the water level fluctuation in the sump reduces the maximum surge value in the forebay of the pump house,increases the second amplitude value,and reduces the fluctuation period.