单支撑超超临界汽轮发电机组轴系动平衡分析OA

Shafting vibration faults of various types have occurred in domestically manufactured,Siemens-technology-based,single-supported steam turbine generator sets.This paper analyzes and details the treatment of these faults.For the low-pressure rotor issue,temporary vibration sensors were installed to intuitively determine the rotor's vibration mode.A shaft vibration model was then constructed,which resolved the challenge of strong vibration coupling between rotors in single-supported steam turbine.Based on the vibration mode information obtained from the temporary sensors,a counter weight scheme was formulated and implemented.The feasibility of this scheme was verified by two dynamic balancing operations of low-pressure rotor,which showed good repeatability in influence coefficients and Bode plot data before and after weighting,so the vibration at bearing No.3 was effectively reduced.To address the thermal imbalance of the generator rotor,counter weights were added at the generator-turbine coupling,thus,the increased relative vibration was effectively mitigated at the generator's front bearing and the turbine's rear bearing,with vibration data confirming the on-site effectiveness of the coupling weighting scheme.Furthermore,to resolve the increased runout and vibration of the collector ring rotor after long-term operation,high-speed dynamic balancing was performed on the collector ring fan,which successfully reduced the relative vibration of the collector ring rotor.The research findings can provide reference for diagnosing shafting vibration faults and calculating high-speed dynamic balancing data for similar units.