This paper used the opposed-flow flame model and GRI 3.0 mechanism to investigate NO emission characteristics of H₂-rich and H₂-lean syngas under diffusion and premixed conditions, respectively, and analyzed influences of adding H₂O, CO₂ and N₂ on NO formation from the standpoint of thermodynamics and reaction kinetics. For diffusion flames, thermal route is the dominant pathway to produce NO, and adding N₂, H₂O and CO₂ shows a decreasing manner in lowering NO emission. The phenomenon above is more obvious for H₂-rich syngas because it has higher flame temperature. For premixed flames, adding CO₂ causes higher NO concentration than adding H₂O, because adding CO₂ produces more O radical, which promotes formation of NO through NNH + O = NH + NO, NH + O = NO + H and reversed N + NO = N₂ + O. And in burnout gas, thermal route is the dominant way for NO formation. Under this paper's conditions, adding N₂ increases the formation source of NO as well as decreases the flame temperature, and it reduces the NO formation as a whole. In addition, for H₂-lean syngas and H₂-rich syngas with CO₂ as the diluent, N + CO₂ = NO + CO plays as an important role in thermal route of NO formation.

本文所用的对置流火焰模型和GRI 3.0机制，调查的H 9 NO发射特性₂富和H ₂个扩散和预混合的条件下，分别合成气贫，并分析加入H的影响₂ O，CO ₂和N从热力学和反应动力学的观点来看，关于NO的形成如图_2所示。对于扩散火焰，热途径是产生NO的主要途径，而添加N ₂，H ₂ O和CO ₂在降低NO排放方面表现出下降的方式。对于富H _2的合成气，上述现象更为明显，因为它具有较高的火焰温度。对于预混火焰，添加一氧化碳₂比加入H ₂ O引起更高的NO浓度，因为加入CO ₂会产生更多的O自由基，这会通过NNH + O = NH + NO，NH + O = NO + H和反向N + NO = N ₂  +促进NO的形成。O.在燃尽气体中，热途径是形成NO的主要途径。在本文的条件下，添加N _2会增加NO的形成源并降低火焰温度，从而整体上减少NO的形成。另外，对于以CO ₂为稀释剂的贫H ₂合成气和富H ₂合成气，N + CO ₂  = NO + CO在NO生成热途径中起重要作用。