The abnormal vibration happened to the high-pressure steam pipes of a 660 MW ultra-supercritical unit.Through the vibration analysis
vibration measurement
evaluation and modal analysis
the causes of the vibration are found.And then the measure of installing dampers in the appropriate locations is proposed to reduce the vibration.After the treatment
the measurement on the vibration is carried out again
which shows that the vibration is controlled within the allowable safety limit.It provides a strong guarantee for the safe and stable operation of power plant and the results can be used for reference in dealing with the vibration of pipes of same type units.