Fuel and load flexibility have been increasingly important features of industrial gas turbines in order to meet the demand for increased utilization of renewable fuels and to provide a way to balance the grid fluctuations due to unsteady supplies of wind and solar power. Experimental investigations were performed in a standard 3rd generation dry low emission (DLE) burner under atmospheric pressure conditions to study the effect of load variations and hydrogen (H~2~) enrichment in the natural gas (NG) flame. High-speed KHz planar laser-induced fluorescence (PLIF) of OH radicals and imaging of OH chemiluminescence were employed to investigate the flame stabilization, turbulence flame interactions and flame dynamics. Along with the optical measurements, combustion emissions were also recorded to observe the effect of changing operating condition on NO~X~ level. The employed burner is used in Siemens SGT-700 and SGT-800 gas turbines with minor hardware differences and the study thus is a step to characterize fuel and load flexibility for these turbines. The flame was investigated combusting H~2~/NG fuel mixtures where the H~2~ amount was changed from 0 to 100% in volumetric ratio. The results show that the characteristics of the flames are clearly affected by the addition of hydrogen and by the load variations. The flame becomes more compact, the anchoring position moves upstream the burner exit and the OH signal distribution becomes more distinct for H~2~ addition due to increased reaction rate, diffusivity, and laminar burning velocity. Changing the load from part to full, similar trends were observed in the flame behavior but in this case due to higher heat release for increased turbulence intensity.


Investigation of Fuel and Load Flexibility in a SGT-600/700/800 Burner Under Atmospheric Pressure Conditions Using High-Speed OH-PLIF and OH Chemiluminescence Imaging

Division / Sponsor:
International Gas Turbine Institute (IGTI)

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2020/volume/84058

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