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.
出处
《动力工程》
CSCD
北大核心
2009年第5期502-506,共5页
Power Engineering
关键词
超临界机组
氧化膜
T92钢
受热管
壁温
supercritical unit
oxide scale
T92 steel
heat surface tube
wall temperature
