This paper proposes a method for predicting the creep rupture life of superheater tubes, considering the continuous increasing metal temperature and stress as a result of oxide formation. The steam‐side oxide growth was assessed by the parabolic oxidation rate law, and the temperature profiles of superheater tubes was calculated combining the 3D computational fluid dynamics simulation and the 1D analytical models. Based on the estimated temperature and maximum elastic hoop stress, the parametric extrapolation technique was utilized to assess the creep rupture life. The validity of this method was confirmed by measuring the oxide thickness and the steam temperature in the field. The results found that T91 alloy in the steam outlet region and T23 alloy at the connection point was susceptible to creep rupture failure, which had the greatest cumulative damage and thickest oxide scale. The cumulative damage of superheater tubes varied significantly with tube count. Results suggested that replacement of the particular T91 alloy tubing section having the minimum creep rupture life with a better heat‐resistant steel would avoid mechanical failure by creep for the subject boiler system.

中文翻译：

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发电厂过热器蠕变断裂寿命评估

考虑到由于氧化物形成而导致的金属温度和应力的持续升高，本文提出了一种预测过热器蠕变断裂寿命的方法。通过抛物线氧化速率定律评估蒸汽侧氧化物的生长，并结合3D计算流体动力学模拟和1D分析模型来计算过热器管的温度分布。基于估计的温度和最大弹性环向应力，使用参数外推技术评估蠕变断裂寿命。通过在现场测量氧化物厚度和蒸汽温度，证实了该方法的有效性。结果发现，蒸汽出口区域的T91合金和连接点处的T23合金容易发生蠕变断裂破坏，具有最大的累积损伤和最厚的氧化皮。过热器管的累积损坏随管数而变化很大。结果表明，用更好的耐热钢代替蠕变断裂寿命最短的特殊T91合金管段，可以避免因锅炉系统蠕变引起的机械故障。