Experimental study on the effect of hydrogen addition on methane/ethylene diffusion flame soot formation based on light extinction measurement

In this study, the mixed diffusion flame soot of methane, ethylene and hydrogen were studied, and the two-dimensional light extinction measurement was applied to investigate the distribution characteristics of the ethylene flame soot concentration with different methane and hydrogen ratios. The soot concentration distribution was analyzed, and the effect of hydrogen addition and methane addition on the soot distribution of a laminar ethylene diffusion flame was investigated. The experiments showed that the flame soot of pure ethylene was mainly distributed in both sides of the flame, which increased first and then decreased in the height direction, and the distribution in the radial direction moved toward the center of the flame as the height increased. The low methane addition in pure ethylene flame will produce a synergistic effect to promote soot formation, and its effect disappeared with the increase of methane addition, and the adding of hydrogen in pure ethylene flame will inhibit soot formation, and the inhibiting effect increased with the increase of hydrogen. When the three gases were blended together, the inhibition effect of hydrogen on soot formation was greater than the promotion effect of methane on soot formation at this ratio.