Today’s Power generation market is driven by environmental regulations and free-marketrneconomics. The Advanced Gas Turbine technology, in conjunction refinement of HeatrnRecovery Steam Generators and Steam Turbine plant, make Combined Cycle installations thernmost efficient power stations.rnExisting conventional plant can equally benefit by adding Gas Turbines and Heat RecoveryrnSteam Generator’s in a so-called ‘repowering’ process.rnThis paper presents the thermal optimisation potentials of retrofitting the steam turbine withinrnrepowering schemes. Typically, the changing of the thermal cycle parameters of the plant,rndeleting the feed heating steam-bleeds or modifying live and reheat steam conditions tornoptimise the combined cycle process, results in off-design operation of the existing steamrnturbine.rnRetrofitting the steam turbine is a cost-effective way to match the new cycle conditions andrnincreases the overall cycle efficiency. This paper highlights that Steam Turbine retrofittingrnmust be considered as an integral part of the entire project in order to maximise the potentialrnfor even greater gain. Unfortunately, history has shown that much repowering has beenrncarried out without considering the benefits of re-matching the steam turbine.rnIn such cases, a retrospective Steam Turbine retrofit can still offer significant benefits to thernplant owner, especially if the retained, unmodified, steam turbine went into operation somerndecades before.
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