火电机组凝汽器化学补水雾化的数值研究  

Numerical Study on Condenser Chemical Make-up Water Atomization of Thermal Power Unit

作　　者：周兰欣[1] 尹建兴[1] 仲博学[1] 文建平 

机构地区：[1]华北电力大学电站设备状态检测与控制教育部重点实验室,河北省保定市071003 [2]安徽平圩电厂,安徽省平圩市100007

出　　处：《电力建设》2009年第12期6-9,共4页Electric Power Construction

摘　　要：基于两相流理论,采用标准湍流模型和离散相模型,建立凝汽器补水雾化两相流动的物理数学模型,利用CFD计算软件进行了相应的数值计算。对影响喷雾凝结换热效果的主要因素,如喷雾压力、喷嘴孔径、喷雾方式、排汽流速、喷嘴布置方式等进行了详细分析。由计算结果可知:随着排汽流速的增加,蒸汽凝结量减少,出口水滴平均温度升高;喷雾压力,喷嘴孔径及喷雾方向对换热效果具有综合作用,最佳的补水雾化系统需要进行综合技术比较才能确定。Based on two-phase flow theory, the mathematical model for two-phase flow for condenser water atomization is established with standard turbulence model and discrete-phase model, and corresponding numerical calculations is performed by means of CFD. A detailed analysis on the main factors effecting on spraying condensation heat transfer, such as spray pressure, nozzle size, spraying directions, exhaust flow rate and nozzle arrangement, is executed. The results show that ： with increase of exhaust flow the volume of steam condensation is reduced and average temperature of outlet water droplets increased. Spray pressure, nozzle diameter and spraying directions have effect on the heat transfer, the best water atomization system should be determined by general technical comparison.

关 键 词：凝汽器 补水雾化 凝结换热 数值模拟 

分 类 号：TK264.11[动力工程及工程热物理—动力机械及工程]