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θ函数法是锅炉承压部件寿命评估发展到第四阶段的评估方法,与Larson-Miller相比具有精度高、外推时间长等优点。为了实现锅炉承压部件寿命的在线监测,本文以θ函数法作为基础算法,在VC编程环境下,将寿命预测步骤设计编写成计算机程序,实现了θ函数的数据拟合,并将拟合结果用于蠕变损耗分析;同时,给出了蠕变损耗的计算方法与步骤;最后,结合现场运行数据,运用θ函数法,对某电厂中材料为P91的高温过热器出口联箱进行蠕变寿命损耗的在线估算与预测,实现了θ函数法与现场实际的结合。
The θ function method is the assessment method of the life assessment of boiler pressure components to the fourth stage. Compared with Larson-Miller, θ function method has the advantages of high precision and long time extrapolation. In order to realize the on-line monitoring of the life of boiler pressure parts, this paper takes the θ function method as the basic algorithm, and in the VC programming environment, the life prediction step design is compiled into a computer program, the θ function data fitting is realized, and the fitting result Which is used to analyze the creep loss. At the same time, the calculation method and steps of creep loss are given. Finally, combining with the field operation data, using the θ function method, the creep of the outlet header of the high temperature superheater with the material P91 in a power plant Online life expectancy loss estimation and prediction, to achieve the θ function method and the actual field combination.