Influence of Steam Dilution on Nitrogen Oxide Formation in Premixed Methane/Hydrogen Flames
Influence of Steam Dilution on Nitrogen Oxide Formation in Premixed Methane/Hydrogen Flames
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蒸汽稀释对预混甲烷/氢气火焰中氮氧化物形成的影响
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
C. Paschereit
中科院分区：
文献类型：
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作者：
S. Göke;C. Paschereit
研究了天然气和氢气在常压下的预混合燃烧，在相当大的等效比和不同程度的空气中蒸汽和氮的稀释度高达30%。排放形成，局部温度，OH自由基浓度，火焰形状和位置在燃气试验中测量。测量结果证实，即使在恒定的火焰温度下，蒸汽也能有效地抑制NOx排放的形成。对于天然气和氢气，在潮湿条件下测量了低于10 ppm的NOx和CO排放量，直至接近化学计量的燃料浓度。氮的稀释不会导致排放的减少。用反应器网络进行的数值分析表明，蒸汽稀释对自由基浓度和NOx形成的影响在很大程度上取决于湿度和当量比。在潮湿条件下，由于O原子浓度降低，热、N2O和NNH途径受到显著限制。
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 NOx emissions, even at constant flame temperature. For both natural gas and hydrogen, NOx 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 NOx formation depends strongly on the degree of humidity and on the equivalence ratio. The thermal, the N2O, and the NNH pathway are significantly constrained at wet conditions mainly due to reduced O atom concentrations...