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Active Combustion Control System for Reduction of NOx and Pulsation Levels in Gas Turbines

[+] Author Affiliations
Stanka Kokanović, Gianfranco Guidati, Stephan Torchalla, Bruno Schuermans

ALSTOM (Switzerland), Ltd., Baden, Switzerland

Paper No. GT2006-90895, pp. 673-682; 10 pages
  • ASME Turbo Expo 2006: Power for Land, Sea, and Air
  • Volume 1: Combustion and Fuels, Education
  • Barcelona, Spain, May 8–11, 2006
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4236-3 | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME


This paper presents two different active combustion control systems (ACCS) for the reduction of NOx levels, and suppression of thermo-acoustic instabilities within stationary gas turbines. Dependent on the actual measurement the ACCSs steer the fuel split between different burner groups or within the burner itself in order to find an optimum operation point. In a first step, an active control system has been developed for the ALSTOM GT13E2 gas turbine where the fuel ratio between two burner groups has to be handled to optimise NOx and pulsation levels. Since perturbations in combustion operating conditions have a direct effect on combustion pulsation behaviour, it is possible to control combustor equivalence ratio by using combustion pulsation measurements as an input for the control system. By doing that, lower operating NOx emissions are achieved as operating safety margin to lean blow out (LBO) may be reduced by more than 50% due to a more accurate and controlled handling of combustor equivalence ratio. Although combustion instabilities due to lean blow out are of minor concern within the GT26, the success of this combustion control approach has led to the development of a more advanced method where both, NOx levels and pulsation amplitudes are feedback-controlled simultaneously in order to track the optimum operating point. By using two premixed stages in the burners fuel supply, the equivalence ratio within the combustor is adapted. Engine and single burner test results confirmed control model dynamics predictions. This paper illustrates the applied closed-loop controls concepts and the successful controller verification on single burner and on engine level.

Copyright © 2006 by ASME



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