Formation and reduction of NO from the oxidation of NH3/CH4 with high concentration of H2O
Formation and reduction of NO from the oxidation of NH3/CH4 with high concentration of H2O
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高浓度 H2O 氧化 NH3/CH4 生成和还原 NO
DOI：
10.1016/j.fuel.2019.02.121
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发表时间：
2019-07
期刊：
影响因子：
7.4
通讯作者：
Jun Xiang
中科院分区：
文献类型：
--
作者：
Zhijun Sun;Jun Xu;Sheng Su;Mengxia Qing;Lele Wang;Xiaoning Cui;Mohamed E. Mostafa;Chunxiu Zhang;Song Hu;Yi Wang;Jun Xiang
研究了CH4/NH3氧化过程中NO的均相生成和还原过程，以了解高浓度H2O对NO排放的影响。给出了过量氧比、气体组成(H2O、CO2、NH3和循环NO)对NO生成和还原影响的实验结果。讨论了高浓度H2O和H2O/CO2联合作用对NO生成和还原的影响机理。结果表明，高浓度的H2O对NO的生成有明显的促进作用，这主要归因于在富氧条件下加入水蒸气后产生的OH自由基增多。相比之下，在贫氧条件下，自由基被还原自由基消耗，如CO、H和CHi自由基。在富氧和贫氧条件下，NO浓度均遵循H2O/Ar >； H2O/ >；CO2/Ar的顺序，即Ar/H2O和CO2/Ar的NO排放量分别最高和最低。相应地，H2O/CO2浓度组合对NO还原产生了有效的影响。研究了燃料中NH3浓度对NO排放的影响，结果表明，随着NH3浓度的增加，NO排放量增加。此外，NO再燃结果表明，随着NO浓度的增加，总NO还原量增加，而还原率降低。
This study investigated the homogeneous formation and reduction of NO from the oxidation of CH4/NH3to understand the effect of the high concentrations of H2O on NO emissions. The experimental results about the effects of excess oxygen ratio, gas compositions including H2O, CO2, NH3and recycled NO, on NO formation and reduction were presented. The mechanism about the effects of high concentration of H2O and combined effect of H2O/CO2on NO formation and reduction has been discussed. The results indicates that NO formation was markedly enhanced at high concentrations of H2O, which were mainly attributed to the increased OH radicals with steam addition at oxygen-rich conditions. By contrast, the radicals were consumed by reduction radicals, such as CO, H, and CHiradicals, under oxygen-lean conditions. NO concentrations followed the sequence of H2O/Ar > H2O/CO2> CO2/Ar under both the oxygen-rich and oxygen-lean conditions, which meant that the highest and lowest NO emissions were recorded in Ar/H2O and CO2/Ar respectively. The combined H2O/CO2concentration accordingly exerted an effective impact on NO reduction. The results about the effect of NH3concentration in fuel on NO emission showed that NO emission increased with increasing NH3concentration. Furthermore, NO reburning results implied that with increasing NO concentration, the total NO reduction increased, whereas the reduction ratio decreased.
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