超临界机组孔板下游FAC传质过程动力学分析  

Kinetic Study on Mass Transfer Process with Flow-accelerated Corrosion Downstream of Orifice Plates in Supercritical Units

作　　者：肖卓楠[1] 宋其珉 郭玮 杨杰 赵乐 XIAO Zhuonan;SONG Qimin;GUO Wei;YANG Jie;ZHAO Le(School of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia Autonomous Region,China)

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014010

出　　处：《动力工程学报》2025年第3期347-353,共7页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51966016);内蒙古自治区自然科学基金资助项目(2018LH05012)。

摘　　要：为了更好地预测电厂管道流动加速腐蚀(FAC),基于电厂管道实际工况,使用COMSOL软件根据气含率变化调整水的物性参数,模拟孔板管道下的流场,观察浓度及高湍动能分布区域,通过模拟计算得到不同流相下速度、壁面剪切力及传质系数的变化,并结合单相流、两相流流动中加速腐蚀预测模型,分析了不同气含率对流动加速腐蚀的影响。结果表明:水蒸气的存在导致孔板下游上、中、下部壁面上两相流的FAC速率较单相流的FAC速率均有不同程度增大,且上部壁面的流动加速腐蚀速率增幅最明显;当温度为150℃,介质为两相流且气含率为0.5%时,壁面处的FAC速率最大,为单相流情况下的1.001112倍。To better predict the flow-accelerated corrosion(FAC)in power plant pipelines,the physical parameters of the steam-water mixture were calculated based on the gas holdup according to the actual operating conditions of the power plant pipeline.Using COMSOL software,the flow field downstream of the orifice plate in the pipeline was simulated,and the concentration of iron ions and the distribution of turbulent kinetic energy were analyzed.The variation patterns of velocity,wall shear force,and mass transfer coefficient under different flow phases were obtained.Combined with single-phase flow and two-phase flow accelerated corrosion prediction models,the impact of gas holdup on flow-accelerated corrosion was analyzed.Results show that the presence of water vapor leads to an increase in the FAC rate of two-phase flow on the upper,middle,and lower walls of the pipeline downstream of the orifice plate,compared to the FAC rate of single-phase flow,with the most significant increase occurring on the upper wall.When the temperature is 150℃,the medium is two-phase mixture,and the gas holdup is 0.5%,the FAC rate at the wall is the highest,being 1.001112 times that of the single-phase flow case.

关 键 词：超临界机组 气含率 流动加速腐蚀 多相流 数值模拟 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]