锅炉蒸汽侧氧化膜对过热器金属壁温的影响分析  

The Influence of Steam-side Oxide Scale on the SuperheaterTube Temperature

作　　者：姚余善 李代智[2] 周克毅[1] YAO Yushan LI Daizhi ZHOU Keyi(School of Energy and Environment, Southeast University, Nanjing 210096, China Jiangsu Engineering Consulting Center, Nanjing 210003, China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096 [2]江苏省工程咨询中心,江苏南京210003

出　　处：《江苏电机工程》2016年第5期10-13,共4页Jiangsu Electrical Engineering

基　　金：国家自然科学基金项目(51176031)

摘　　要：针对大型燃煤锅炉高温受热面沿宽度方向受热不均从而引发受热面超温的问题,以某600 MW超临界燃煤锅炉末级过热器为研究对象,结合高温受热面蒸汽侧氧化膜生长预测模型,通过热偏差计算,分析了氧化膜的生长对金属壁温的影响。结果表明:蒸汽侧氧化膜的生长引起管壁温度不同程度地升高,严重的可能导致过热器局部区域超温运行,从而降低了金属高温蠕变断裂寿命,因而热偏差计算中必须考虑氧化膜对金属壁温的影响。For the problem of overheating caused by unevenly heating of high-temperature heating surfaces along the width direction in large coal-fired boilers, a detail study have been performed on the final superheater of 600 MW supercritical coal-fired boiler. Based on the prediction of oxide scale growth model and the heat deviation calculation, the influence of the oxide scale growth on tube temperature was analyzed. Results show that tube temperature increases with the growth of oxide scale, which would lead to local temperature over-run of the superheater tube and decline of creep rupture life, thus the effect of oxide scale on tube temperature should be considered in the heat deviation calculation.

关 键 词：氧化膜 壁温 热偏差 蠕变断裂寿命 

分 类 号：TK222[动力工程及工程热物理—动力机械及工程]