Occurrence of NO-reburning in MILD combustion evidenced via chemical kinetic modeling
Occurrence of NO-reburning in MILD combustion evidenced via chemical kinetic modeling
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DOI：
10.1016/j.fuel.2006.05.021
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发表时间：
2006-12-01
期刊：
影响因子：
7.4
通讯作者：
Dagaut, Philippe
中科院分区：
文献类型：
--
作者：
Nicolle, Andre;Dagaut, Philippe
对CH4的稀释氧化进行了数值研究，以探讨no再燃烧机制在轻度燃烧条件下的潜在重要性。结果表明，NO-HCN转化反应在自燃前特别活跃。在此期间，最初在NO中所含的氮被储存在HCN和NH3中。这种现象的程度取决于等效比和不混合程度。随后，氮被恢复为其原始的NO形式。在着火后阶段，热途径和N2O途径生成NO的重要性增加。因此，本研究揭示了氮化学的序列特征。虽然这些影响有化学和热两方面的原因，但通过恒温模拟也证明了硝态氮的瞬态再燃烧机制主要与燃料点火化学有关。(c) 2006 Elsevier Ltd.版权所有。
A numerical study of the diluted oxidation of CH4 was performed to investigate the potential importance of the NO-reburning mechanism in conditions relevant to MILD combustion. It turns out that the NO-HCN conversion reactions are particularly active before auto-ignition. During this period, the nitrogen contained initially in NO is stored in HCN and NH3. The extent of this phenomenon depends on the equivalence ratio and on the unmixedness. Subsequently, nitrogen is restored in its original NO form. In the post-ignition period, thermal and N2O pathway to NO grow in importance. Therefore, this study revealed a sequential character of the nitrogen chemistry. Although these effects have both chemical and thermal origin, a transient NO-reburning mechanism was also evidenced via modeling at constant temperature demonstrating it is mainly related to the fuel-ignition chemistry. (c) 2006 Elsevier Ltd. All rights reserved.