The premixed combustion of natural gas and hydrogen at atmospheric pressure is investigated over a wide range of equivalence ratios and different degrees of steam and nitrogen dilution of up to 30% in the air. Emission formation, local temperatures, OH radical concentrations, and flame shape and position are measured in gas-fired tests. The measurement results confirm that steam effectively inhibits the formation of NO x emissions, even at constant flame temperature. For both natural gas and hydrogen, NO x and CO emissions below 10 ppm were measured up to near-stoichiometric fuel concentrations at wet conditions. Nitrogen dilution does not lead to reduced emissions. A numerical analysis conducted with a reactor network shows that the influence of steam dilution on radical concentrations and NO x formation depends strongly on the degree of humidity and on the equivalence ratio. The thermal, the N 2 O , and the NNH pathway are significantly constrained at wet conditions mainly due to reduced O atom concentrations, whereas prompt NO x can be increased due to higher CH radical concentrations for the natural gas flame. Thus, the inhibiting effect of steam dilution on NO x formation is stronger at high flame temperatures.


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    Title :

    Influence of Steam Dilution on Nitrogen Oxide Formation in Premixed Methane/Hydrogen Flames


    Contributors:

    Published in:

    Publication date :

    2013-01-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






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