过热器/再热器管道壁面温度的预测  

Prediction of wall temperature diversification of superheater and reheater tubes

作　　者：徐鸿[1] 赵志渊[1] 林振娴[1] 

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《中南大学学报（自然科学版）》2011年第9期2865-2874,共10页Journal of Central South University:Science and Technology

基　　金：中央高校基本科研业务费专项资金资助项目(09QX61);北京市教育委员会共建项目(X90017)

摘　　要：为了得到过热器/再热器管壁温度分布特性,通过对过热器/再热器管道的传热过程进行研究,并与经验公式相结合建立具有氧化膜的炉管传热的物理模型。分析在不同的管道几何尺寸、烟气温度、蒸汽流量和温度的情况下,管道外壁温度、氧化层/基体界面温度和氧化层/蒸汽界面温度的变化过程,最后定量地解释管道外壁温度、氧化膜/基体温度随运行时间增长而升高的原因,得到了它们的温升系数Aw和An与氧化层引起的温升系数B之间的关系为:B=α1Aw+α2An(其中,α1和α2分别为管外壁、氧化层/基体界面对氧化膜增长的敏感程度)。In order to get the wall temperature distribution characteristics of superheater/reheater tubes,a heat-transfer physical model of tubes with the oxide film was established by studying the heat transfer process of superheater/reheater tubes and the empirical formula.The temperature changing processes of tube outer-wall,the oxide scale/substrate interface and the oxide scale/steam interface were analyzed at different tube geometries,gas temperatures,steam flows,pressures and temperatures.Finally,the reason why the tube outer-wall temperature and the oxide scale/substrate interface temperature increase with the increase of the running time is quantitative interpreted,and the relationship between Aw,An and B is as follows：,in which and represent the sensitivity of tube outer-wall and the interface between oxide scale and substrate to the growth of oxide scale.

关 键 词：氧化膜 温度 传热 预测 

分 类 号：TG171[金属学及工艺—金属表面处理]