汽轮机转子温度计算中惯性环节系数的确定方法

Determination of Inertia Coefficient for Calculation of Turbine Rotor Temperatures

提出了一种利用有限元计算结果、通过模式搜索法来确定有关惯性环节系数的方法.该方法将冷态启动、热态启动和极热态启动过程的汽轮机转子有限元法计算所得体积平均温度作为标准值,通过优化搜索来确定惯性环节法计算汽轮机转子体积平均温度的并联惯性环节的个数,以及每个惯性环节的时间常数和权重系数.通过温态启动过程的汽轮机转子有限元法和惯性环节法计算所得体积平均温度的对比,来验证该方法计算所得系数的精度和易用性.结果表明:该方法所得的常数和系数满足工程应用的精度要求,为汽轮机转子的热应力优化控制和汽轮机变负荷运行的安全性提供了技术支持.

A method was proposed for determination of relevant inertial coefficients through pattern-based direct search algorithm using finite element calculation results,which takes the average temperature of turbine rotor in cold,hot and extremely hot start process calculated by finite element method as standard values,and subsequently determines the number of parallel inertia links,and the time constant and weighting coefficients of each inertia link by optimized search algorithm.A comparison was made to the calculated rotor bulk temperature in warm start process between finite element method and inertia link algorithm,so as to verify the calculation accuracy and availability of the proposed method.Resuts show that the constant and coefficient obtained by the proposed method can satisfy the precision requirement of actural engineering projects,which therefore may serve as a reference for safety operation of turbine rotors in thermal stress control and optimization at variable operation modes.