This work aims at estimating the efficiency gain resulting from using lean premixed combustors in hydrogen-fired combined cycles with respect to diffusive flame combustors with significant inert dilution to limit NOx emissions. The analysis is carried out by considering a hydrogen-fired, specifically tailored gas turbine whose features are representative of a state-of-the-art natural gas–fired F-class gas turbine. The comparison between diffusion flame and lean premixed combustion is carried out considering nitrogen and steam as diluents, as well as different stoichiometric flame temperatures and pressure drops. Results show that the adoption of lean premixed combustors allows us to significantly reduce the efficiency decay resulting from inert dilution. Combined cycle efficiency slightly reduces from 58.5%–57.9% when combustor pressure drops vary in the range 3%–10%. Such efficiency values are comparatively higher than those achieved by diffusive flame combustor with inert dilution. Finally, the study investigated the effects of decreasing the maximum operating blade temperature so as to cope with possible degradation mechanisms induced by hydrogen combustion.
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Using Hydrogen as Gas Turbine Fuel: Premixed Versus Diffusive Flame Combustors
Matteo Gazzani,
Matteo Gazzani
1
e-mail: matteo.gazzani@mail.polimi.it
1Corresponding author.
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Emanuele Martelli,
Emanuele Martelli
Energy Department,
Politecnico di Milano
,Via Lambruschini 4
,Milano 20156
, Italy
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Iarno Brunetti
Iarno Brunetti
Enel Ingegneria e Ricerca
,via A. Pisano 120
,Pisa 56121
, Italy
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Matteo Gazzani
e-mail: matteo.gazzani@mail.polimi.it
Emanuele Martelli
Energy Department,
Politecnico di Milano
,Via Lambruschini 4
,Milano 20156
, Italy
Iarno Brunetti
Enel Ingegneria e Ricerca
,via A. Pisano 120
,Pisa 56121
, Italy
1Corresponding author.
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received October 21, 2013; final manuscript received November 22, 2013; published online January 2, 2014. Editor: David Wisler.
J. Eng. Gas Turbines Power. May 2014, 136(5): 051504 (10 pages)
Published Online: January 2, 2014
Article history
Received:
October 21, 2013
Revision Received:
November 22, 2013
Citation
Gazzani, M., Chiesa, P., Martelli, E., Sigali, S., and Brunetti, I. (January 2, 2014). "Using Hydrogen as Gas Turbine Fuel: Premixed Versus Diffusive Flame Combustors." ASME. J. Eng. Gas Turbines Power. May 2014; 136(5): 051504. https://doi.org/10.1115/1.4026085
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