Nitric Oxide Formation in H2/CO Syngas Non-premixed Jet Flames
Nitric Oxide Formation in H2/CO Syngas Non-premixed Jet Flames
复制标题
H2/CO 合成气非预混合射流火焰中一氧化氮的形成
DOI：
10.1016/j.egypro.2015.02.004
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Dinesh K
中科院分区：
文献类型：
--
作者：
Dinesh K
对高氢含量(HHC)合成气非预混喷流火焰进行了直接数值模拟。所使用的详细化学是GRI 3.0，更新了使用火焰面生成流形(FGM)的NCN自由基化学的影响。通过FGM列表和进动变量输运方程考虑了优先扩散效应。结果表明，纯H_2火焰的火焰温度与NO浓度之间存在很强的相关性，其中NO的生成以热机制和NNH机制为特征。结果还表明，由于CO稀释到H2中的温度降低，合成气混合物中的最大NO值迅速下降，从而增加了CH自由基对速效NO机制的贡献。
Direct numerical simulations (DNS) of high hydrogen content (HHC) syngas nonpremixed jet flames have been carried out to study the nitric oxide (NO) formation. The detailed chemistry employed is the GRI 3.0 updated with the influence of the NCN radical chemistry using flamelet generated manifolds (FGM). Preferential diffusion effects have been considered via FGM tabulation and the progress variable transport equation. The results indicate a strong correlation between the flame temperature and NO concentration for pure H2flame, in which NO formation is characterised by the thermal and NNH mechanisms. The results also indicate a rapid decrease of maximum NO values in the syngas mixtures due to lower temperatures associated with the CO-dilution into H2, thereby increasing the contribution of the prompt-NO mechanism via CH radicals.