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Ansaldo GT26 Sequential Combustor Performance in Long-Term Commercial Operation

[+] Author Affiliations
Selma Zahirovic, Klaus Knapp

Ansaldo Energia Switzerland AG, Baden, Switzerland

Paper No. GT2017-64289, pp. V04BT04A008; 10 pages
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 4B: Combustion, Fuels and Emissions
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5085-5
  • Copyright © 2017 by ASME


The Ansaldo GT26 reheat gas turbine features the sequential combustion system with further improvements for extended fuel flexibility, increased operational flexibility and even lower NOx emissions compared to its predecessor, GT26 (2006). Better overall sequential combustor performance is achieved through an improved sequential burner and fuel lance. The design optimizations resulted in an improved fuel/oxidant mixing for lower NOx and CO emissions over a broad load range and extended fuel flexibility with regards to highly reactive fuels. The wide operation window is extended thanks to integrated acoustic damping devices, reducing combustion pulsations and extending lifetime. The improved hardware passed through an extensive testing and validation program on the high pressure full-scale test rig and validation engine. The performance of the Ansaldo GT26 sequential combustor in long-term operation is assessed based on data of two commercial engines and presented in this paper. For both engines, a broad operating window with reduced sequential combustor acoustic load was demonstrated, reconfirming the effectiveness of the damping devices. The emission compliance test ratified emission levels significantly below the site-specific guarantee limits, showing single digit NOx emissions at 15%-vol. O2 at base load. Natural gases with different heating values and C2+content were supplied and varied during continuous engine operation, revealing combustor insensitivity to lower Wobbe numbers. Long-term monitoring data bear witness to unchanged performance of the two engines since commissioning.

Copyright © 2017 by ASME



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