Abstract
The effect of hydrogen addition to ultra lean counterflow CH 4/air premixed flames on the extinction limits and the characteristics of NO x emission was investigated by numerical simulation. Detailed chemistry and complex thermal and transport properties were employed. The results show that the addition of hydrogen can significantly enlarge the flammable region and extend the flammability limit to lower equivalence ratios. If the equivalence ratio is kept constant, the addition of hydrogen increases the emission of NO in a flame due to the enhancement in the rate of the NNH or N 2O intermediate NO formation routes. The addition of hydrogen causes a monotonic decrease in the formation of NO 2 and N 2O, except flames near the extinction limits, where the emission of NO 2 and N 2O first increases, and then decreases with the increase in the fraction of hydrogen. Overall, hydrogen enrichment technology allows stable combustion under ultra lean conditions, resulting in significant CO 2 and NO emission reduction.
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