反应堆舱室屏蔽冷却水系统换热性能的数值模拟研究

Numerical simulation of heat transfer performance of shieldedcooling water system in reactor cabins

以某高温气冷堆项目的屏蔽冷却水系统为研究对象,采用Fluent软件对笼式和扩展板式2种管道布置方案进行了数值模拟计算,分析了保温材料的导热系数、保温层厚度、扩展板竖向间距和高度对混凝土壁面温度的影响。研究结果表明:保温材料导热系数的降低和保温层厚度的增加有利于降低混凝土壁面的最高温度,且扩展板管道布置方案对混凝土壁面的冷却效果优于笼式方案;通过降低扩展板的间距可以加强混凝土壁面的散热效果,但扩展板高度的变化对评价指标没有明显的积极作用。

Taking the shielded cooling water system of a high temperature gas-cooled reactor project as the research object,the numerical simulation of two pipeline layout schemes of cage and extension plate is carried out by Fluent software,and the influence of the thermal conductivity of insulation material,the thickness of insulation layer,the vertical distance and height of extension plate on the temperature of the concrete wall is analysed.The results show that the decrease of the thermal conductivity of insulation material and the increase of the thickness of insulation layer are beneficial to reducing the maximum temperature of the concrete wall,and the cooling effect of the extension plate pipe layout scheme on the concrete wall is better than that of the cage scheme.By reducing the distance between extension plates,the heat dissipation effect of the concrete wall can be enhanced,but the change of the height of extension plate has no obvious positive effect on the evaluation index.