Bending Fault Caused by Steam Turbine HP-IP Rotor Materials

doi:10.11930/j.issn.1004-9649.2014.8.94.3

Electric Power ›› 2014, Vol. 47 ›› Issue (8): 94-97.DOI: 10.11930/j.issn.1004-9649.2014.8.94.3

• Generation Technology • Previous Articles Next Articles

Bending Fault Caused by Steam Turbine HP-IP Rotor Materials

LI Heng-hai¹, AN Zheng-feng², WANG Bao-yu¹, GU Zhi-de³

1. Huadian Electric Power Research Institute, Hangzhou 310030, China;
2. Datang Jingtai Power Plant, Baiyin 730408, China;
3. Gansu Electric Power Research Institute, Lanzhou 730050, China

Received:2014-04-10 Online:2014-08-18 Published:2015-12-10

Abstract

Abstract: Aiming at the HP-IP rotor bending faults which frequently happened in the operation of 600-MW turbine generating units in recent years, the reason and mechanism of the rotor bending are analyzed through the bending characteristics of the similar HP-IP rotor bending examples of two 600-MW supercritical units. It is concluded that the defect of HP-IP rotor materials is the key factor causing the bending. The uneven material makes the elastic bending happen in the high temperature steam and the stress relaxation caused by the excessive and asymmetrically axis distributed residual stress in high temperature steam heating leads to permanent bending. The secure and economic operation problems caused by rotor bending are summarized. The processing methods and prevention strategies are also included.

Key words: 600-MW steam turbine, HP-IP rotor, material defect, bending fault

CLC Number:

TK263.6+1

LI Heng-hai, AN Zheng-feng, WANG Bao-yu, GU Zhi-de. Bending Fault Caused by Steam Turbine HP-IP Rotor Materials[J]. Electric Power, 2014, 47(8): 94-97.

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Bending Fault Caused by Steam Turbine HP-IP Rotor Materials

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