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为了得到锅炉水冷壁管道周向温度分布和内壁氧化膜生长的特性,通过对其传热过程的研究,建立起预测具有内壁氧化膜的管道温度分布的数值模型。并根据管状热流设备测得的管道热流密度,针对某电厂的水冷壁管道实际运行情况进行计算,结果表明在圆周角为120°时管道各界面的温度和氧化膜厚度最小,在圆周角为0°时管道各界面的温度和氧化膜厚度最大,与实际运行数据有很好的一致性。用该方法预测氧化膜厚度及管壁各界面温度是可行的。
In order to obtain the circumferential distribution of temperature and the growth of oxide film in the inner wall of boiler water wall, a numerical model for predicting the temperature distribution of the inner wall oxide film is established by studying its heat transfer process. According to the pipe heat flux density measured by the tubular heat flow equipment, the actual operation of the water wall pipe in a power plant is calculated. The results show that when the circumferential angle is 120 °, the temperature and the oxide film thickness of the pipe interface are the smallest. When the circumferential angle is 0 ° when the temperature of the pipeline interface and oxide film thickness of the largest, with the actual operating data has a good consistency. It is feasible to predict the thickness of the oxide film and the temperature of each interface of the tube by this method.