【摘要】 以某1000MW机组凝汽器为研究对象,应用Fluent软件对投运胶球清洗系统时的水室流场和胶球运动轨迹进行了数值模拟.结果表明:胶球的运动轨迹在水室内变化很大,部分管束区的胶球出现汇集,造成管束不通畅,影响了对管束的清洗效果;通过在入口管板上加装弧形凸起扣板,胶球在管束内分布变得均匀;当凸起扣板厚度取0.15m时,凝汽器的总体传热系数可以提高约4.4%.更多还原

【Abstract】 Taking the condenser in a 1 000 MW unit as an object of study,the water chamber flow field and rubber ball trajectories were simulated with the help of software Fluent during operation of the rubber ball cleaning system.Simulation results show that the rubber ball trajectories change a lot in the water chamber and the rubber balls agglomerate partly in the tube bundle,which causes blocked water flow and inefficient cleaning effect.The distribution of rubber balls becomes uniform in the tube bundle when curved buckles are added on the inlet tube sheet.When the thickness of curved buckles is 0.15 m,the total heattransfer coefficient of condenser would be increased by 4.4%.更多还原