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고주파 가열 장비를 활용한 터빈로터 휨 교정수식모델 개발
박준수,현중섭,박현구,박광하,Park, Junsu,Hyun, Jungseob,Park, Hyunku,Park, Kwangha 한국전력공사 2021 KEPCO Journal on electric power and energy Vol.7 No.2
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.
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이재홍(Jaehong Lee),박광하(Kwangha Park),구재량(Jae Raeyang Koo),박준수(Jun Su Park),박현구(Hyun-Ku Park) 한국기계가공학회 2023 한국기계가공학회지 Vol.22 No.2
A reliability assessment of the repair weld for the steam-turbine bucket cover was performed. The 410 stainless steel alloy was welded via GTAW (gas tungsten arc welding) with an ER410NiMo filler rod. The welding procedure for the steam-turbine bucket cover was qualified using a tensile test, guided-bend test, and hardness measurement. Two-stage post-weld heat treatment was performed to improve the weld metal toughness. The residual stress was then measured using the indentation test method. The mechanical properties of the welded material were assessed via high- and low-cycle fatigue tests and constant load stress corrosion tests in comparison to the performance of the base metal. The repair weld procedure is demonstrated using an original bucket cover. Finally, a high-speed rotational test of a full-size rotor assembled with a welded bucket cover was performed under steam-turbine start-up and shutdown conditions.
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