Abstract:

Based on the structure feature of a power plant’s S109FA gassteam combined cycle unit D10 steam turbine, the performance data of different test period was compared. It was indicated that the unit performance lost in the past 10 years. Combined with the problems found during maintenance, the causes of performance loss were indicated as high pressure cylinder vane damage and flow part scaling. Prevention measurements and suggestion was indicated. This performance analysis could be referred for performance improvement projects of similar units.

Key words:

gassteam combined cycle unit, D10 steam turbine, flow part structure, performance diagnosis