蒸汽侧氧化膜对超临界机组T92钢管壁温的影响  

Influence of Steam-side Oxide Scale on Wall Temperature of T92 Tubes for Supercritical Units

作　　者：边彩霞[1] 周克毅[1] 胥建群[1] 徐啸虎[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《动力工程》2009年第5期502-506,共5页Power Engineering

摘　　要：通过建立T92钢受热管及其蒸汽侧氧化膜的数值分析模型,定量分析了不同厚度氧化膜对T92钢受热管壁温的影响,并在此基础上得出了不同受热条件下导致T92钢管超温运行的氧化膜的临界厚度值.结果表明:随着氧化膜厚度的增加,管壁平均温度和平均温度升高幅度均呈近似线性增加;且管内壁温度越高、管外热流密度越大,氧化膜的临界厚度值越小.因此,当T92钢应用于高温受热面时,需综合考虑壁面热负荷和管内壁温度对氧化膜临界厚度的影响.To quantitatively analyze the influence of oxide scale in different thickness on wall temperature of T92 tubes, a numerical model was built up for simulating the temperature distribution of T92 tube and its steam-side oxide scales, thus various critical thickness of oxide scale under different heating conditions ob- tained, above which overheating operation would occur to corresponding T92 tubes. Results show that with the growth of scale thickness, both the average tube wall temperature and the temperature rise increase approximately linearly; the higher the inner surface temperature and the larger the outer surface heat flux, the smaller the critical scale thickness will be. Therefore when T92 tubes are used as high-temperature heat surfaces, the influence of both the outer surface heat and the inner tube wall temperature should be comprehensively considered in determination of oxide scale thickness.

关 键 词：超临界机组 氧化膜 T92钢 受热管 壁温 

分 类 号：TK265[动力工程及工程热物理—动力机械及工程]