This paper looks at both the increased operational flexibility features brought about by the sequential combustion system of the latest GT26 (50 Hz) and GT24 (60 Hz) upgrades launched in 2011, as well as giving an update on the operational capabilities validated at Alstom’s power plant in Birr, Switzerland. In particular, this paper looks at the improved fuel flexibility, the newly introduced flexible operation modes, and the unique low load operation capability – all made possible thanks to the sequential combustion system of the GT26/GT24.
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