Numerical Simulation of H2 Addition Effect to CH4 Premixed Turbulent Flames for Gas Turbine Burner

Abstract

Present computational simulation studied H2-CH4 combustion characteristics in a specific gas turbine combustor used for power generation. Across four thermal loads (1.1-4.4 bar) and varying hydrogen fraction (0-50% by volume), changes in flame temperature, reaction zone stability, and flow field are scrutinized. Results show coherent thermal patterns and stable flame fronts across all conditions, indicating hydrogen addition does not deteriorate combustion when blended with methane. Flame temperatures increase by approximately 40 K with increasing hydrogen fraction. Acceptable NOx emissions are observed, peaking at 6.20 ppm with 50 % H2 at 168 kW. The combustor enables reliable operation for blends up to 50% hydrogen. These results suggest potential for increasing legislated hydrogen blending limits for more sustainable gas turbine power generation. By expanding the viable envelope for hydrogen-methane mixtures, this work contributes to understanding combustion of decarbonized fuels in gas turbines. However, as results are limited to the investigated combustor geometry, generalized conclusions cannot be drawn at this stage. Nonetheless, this study represents an incremental advancement in knowledge that may inform future research on sustainable power generation and decarbonization efforts.

Keywords

• hydrogen-methane
• high pressure burners
• swirled flames
• gas turbine
• pollutants