Open AccessDiagnosis method of turbine blade loosening
Author(s) -
Qingliang Niu,
Yuli Gong,
Guohong Tian,
Chuanling Liu
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1986/1/012075
Subject(s) - steam turbine , rotor (electric) , vibration , blade (archaeology) , turbine , cylinder , turbine blade , structural engineering , generator (circuit theory) , mechanical engineering , engineering , materials science , power (physics) , acoustics , physics , quantum mechanics
Abnormal vibration of low-pressure rotor occurred after low-pressure cylinder cutting transformation of 330MW steam turbine generator unit in a power plant. Through the analysis of vibration data, the vibration spectrum was mainly manifested as low-frequency component of 18Hz, which fluctuates with time cycle, and it was judged that it might be related to the loosening of low-pressure rotor blades. After 6 months of operation, routine inspection after cylinder cutting showed that there were three loose roots and worn top steam seals on the secondary last stage blades of low pressure rotor. After repairing the blades, the abnormal vibration problem of the low pressure rotor of the turbine generator set was successfully solved.