Balanceamento estático de acoplamento de turbo gerador usando método do coeficiente de influência

Abstract

Large rotary machines are very common in thermoelectric plants, whether in steam plants, natural gas or operating in combined cycle. The importance of achieving high reliability and availability of these equipment for power generation process justifies the use of advanced Maintenance Engineering techniques for the monitoring and diagnosis of faults, such as vibration analysis and rotor dynamics analysis. Among the several known failures in rotary machines, this work highlights unbalance, which can generate high maintenance costs and high risk to operational safety if not detected and corrected prematurely. By means of a previous theoretical basis from the branches of rotor dynamics and mechanical vibrations, concomitantly with a survey of information concerning the equipment in question, it will be possible to carry out a well-structured case study of the static balancing of a coupling that couples the low pressure turbine shaft to the electric generator shaft of a turbo generator with a capacity of 365 MW, through the coefficient of influence method, based on the mechanical vibrations of the most affected bearing by the unbalance, and using rotor analysis tools such as the Bode plot, orbit analysis and spectrum analysis as criteria for monitoring and evaluation of equipment conditions.