The turbine rotor, one of the main facilities in a power plant, it generates electricity while rotating at 3600 RPM. Because it rotates at high speed, it requires careful management because high vibration occurs even if it is deformed by only 0.1mm. However, bending occurs due to various causes during turbine operating. If turbine rotor bending occurs, the power plant must be stopped and repaired. In the past, straightening was carried out using a heating torch and furnace in the field. In case of straightening in this way, it is impossible to proceed systematically, so damage to the turbine rotor may occur and take long period for maintenance. Long maintenance period causes excessive cost, so it is necessary to straighten the rotor by minimizing damage to the rotor in a short period of time. To solve this problem, we developed a turbine rotor straightening equipment using high-frequency induction heating equipment. A straightening was validated for 500MW HIP rotor, and the optimal parameters for straightening were selected. In addition, based on the experimental results, finite element analysis was performed to build a database. Using the database, a straightening amount prediction model available for rotor straightening was developed. Using the developed straightening equipment and straightening prediction model, it is possible to straightening the rotor with minimized damage to the rotor in a short period of time.
본 연구는 4개 발전사 협력과제(남부발전, 동서발전, 서부발전, 중부발전) 연구비에 의해 지원되었음
References
Ha, H.C. and Choi, S.P., "Vibration Characteristics of Steam Turbine due to the Rubbing," The Korean Society for Power System Engineering, Vol. 97, No. 1, pp. 5-8, 1999
한상규, "증기터빈 고중압로터 열적변형 곡직실험을 통한 굽힘량 개선", M.S. Thesis, 기계시스템공학과, 충남대학교, 대전, 2019
ABAQUS Analysis User's Manual, Dassault System, USA, 2020
H. Dyja, P. Korczak, "The thermal-mechanical and microstructural model for the FEM simulation of hot plate rolling", Journal of Materials Processing Technology, Vol92-93, pp. 463-467, 1999https://doi.org/10.1016/S0924-0136(99)00215-0