The current research provides the impact of hydrogen enrichment on gas turbine combustion characteristics. The uniqueness of this study is it enables isolating the hydrogen effects while minimizing the impact of other parameters that are known to influence combustion characteristics.  Experiments are carried out under high operating pressure and a wide range of firing temperatures that extends from the Lean Blow Out (LBO) limit up to extreme temperatures. Aerodynamic effects are isolated by using a perforated plate burner to provide simple flame structure. Also, the study is conducted under perfectly premixed conditions to exclude the mixing effects from the problem under investigation. Air flow, residence time, pressure and temperature are all held constant to enable back to back comparison. Hydrogen enrichment is varied from 0 to 25 percent by volume (comparison at the same combustor exit temperature). No cooling air or effusion air is used in the combustion zone to ensure that there is no impact on the problem under investigation and to focus the study on kinetics effects and flame shape variation. NOx, CO emissions, LBO limits as well as flame luminosity are reported. Oxygen and carbo dioxide are measured at the combustor exit and used to ensure test integrity and confirm the exit temperature estimation. A reactor network model is also validated against the experimental data. The effective residence time in the model is varied slightly to mimic the slight change observed in flame length with hydrogen addition. This basic research provides a key resolution to the contradictory results that are typically reported in the literature for the impact of hydrogen on NOx emissions.


Hydrogen Enrichment Impact on Gas Turbine Combustion Characteristics

Division / Sponsor:
International Gas Turbine Institute (IGTI)

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

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