ANALYSIS OF STEAM TURBINE INSTABILITIES OF A100 MW COMBINED CYCLE POWER PLANT

摘要

An analysis of the vibration field of the steam turbine in a combined cycle power plant has been used to identify the causes of the plant rejection at commissioning. The steam turbine group consists of a high pressure turbine connected through a gear box to a medium and low pressure turbine. The high vibration level in the main steam turbine journal bearings caused the plant can't reach nominal power 100 MW, and at approximately 43 MW the plant was rejected.Vibration is measured through proximity non-contact sensors (two per bearing at 90°), which give relative displacements between shafts and the bearing housing. Accelerometers are also located in the bearing housing.