Effect of heat transfer coefficient of steam turbine rotor on thermal stress field under off-design condition

Abstract

The precise calculation of temperature and thermal stress field of steam turbine rotor under off-design conditions is of paramount significance for safe and economic operation, in which an accurate calculation of heat transfer (HT) coefficient plays a decisive role. HT coefficient changes dramatically along with working conditions. First, a finite element analysis of rotor model, applied with ordinary rotor materials, has been conducted to investigate the temperature and thermal stress difference along with the change of HT coefficient from 20 W/(m²·°C) to 20000 W/(m²·°C). Next, the differentiation between existing empirical formulas has been analyzed from the aspect of physical significance of non-dimension parameters. Finally, a verifying case of the cold startup of a 1000MW unit has been proceeded. The result shows that the accuracy of coefficient calculation when steam parameters are low has a greater influence on that of rotor temperature and thermal stress, which means a precise empirical HT coefficient formula, like the Sarkar formula is strongly recommended. When steam parameters are high and HT coefficient is larger than 10⁴ W/(m²·°C), there will be barely any influence on the calculation of thermal stress. This research plays a constructive role in the calculation and analysis of thermal stress.

Keywords

steam turbine / rotor / thermal stress / heat transfer coefficient / empirical formula

References

[1] Yang Z L, Wang H N, Yang C G. Analysis of 600 MW turbine rotor thermal stress and loss of life. Turbine Technology, 2011(5): 383–385(in Chinese)

[2] Yang S M, Tao W Q. Heat Transfer. 4th ed. Beijing: Higher Education Press, 2006 (in Chinese).

[3] Zhang H L, Xie D M, Xiong Y H, Sun K F. The research and development of high-quality thermal-stress online monitoring model for 600 MW turbine rotors. In: Proceedings of the CSEE, 2006, 26(1): 21–25

[4] Sarkar D, Mukherjee P K, Sen S K. Approximate analysis of steady state heat convection in an induction motor. IEEE Transactions on Energy Conversion, 1993, 8(1): 78–84

[5] Adinarayana N, Sastri V M K. Estimation of convective heat transfer coefficient in industrial steam turbine. Journal of Pressure Vessel Technology, 1996, 118(2): 247–250

[6] Ding Y Y, Zhou H L. Steam Turbine Strength Calculation. Beijing: China Water and Electric Power Press, 1985

[7] Liu Y F, Hao R T, Gao J Q. The comparison and application of two common formula of heat transfer coefficient. Turbine Technology, 2007, (2): 97–98, 102 (in Chinese)

[8] Qi H T, Hu N S, Zhou Y Y. Application to the calculation formula of the H-exchange coefficient of ALSTHOM. Turbine Technology, 2004, 46(1): 21–22 (in Chinese)

[9] Liu S, Zhou Y, Zhang H L, Xie D M. Precision correction for surface heat transfer coefficient of a steam turbine rotor. Thermal Power Generation, 2014, 43(7): 143–147

[10] Zhang C, Xu Z L, Liu S, Feng Y X, Yang Y, Zheng L K. Steam turbine rotor thermal stress calculation with thermos-structural coupled model. Journal of Xi’an Jiaotong University, 2014, 48(4): 68–72 (in Chinese)

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg