Experimental and Kinetic Study on Laminar Burning Velocities of High Ratio Hydrogen Addition to CH4+O2+N2 and NG+O2+N2 Flames

In 2020, energy-related CO2 emissions reached 31.5 Gt, leading to an unprecedented atmospheric level of 412.5 ppm. Hydrogen blending in natural gas (NG) is a solution for maximizing clean energy utilization and enabling long-distance H2 transport through pipelines. However, insufficient comprehension concerning the combustion characteristics NG, specifically when blended with high proportion hydrogen up 80%, particularly minority species, persists. Utilizing heat flux method at room temperature 1 atm, this experiment investigated laminar burning velocities CH4/NG/H2/air/He flames incorporating C2H6 C3H8, within NG. The results point out regularity SL enhancement, reaching its maximum equivalence ratio 1.4. Furthermore, propensity enhancement velocity aligned observed thermoacoustic oscillation instability during fuel-rich regimes. experimental findings were contrasted kinetic simulations, utilizing GRI 3.0 San Diego mechanisms facilitate analysis. inclusion augments chemical reactions preheating zone, while thermal effect from negligible. Both simulated revealed that CH4 NG large had no difference, matter whether or analysis aspect.