Effect of H2O Vapor on NO Reduction by CO: Experimental and Kinetic Modeling Study
Effect of H2O Vapor on NO Reduction by CO: Experimental and Kinetic Modeling Study
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H2O 蒸汽对 CO 还原 NO 的影响：实验和动力学模型研究
DOI：
10.1021/ef300580y
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发表时间：
2012-07-01
期刊：
影响因子：
5.3
通讯作者：
Guo, Xiaofeng
中科院分区：
文献类型：
--
作者：
Li, Sen;Wei, Xiaolin;Guo, Xiaofeng
为了研究水蒸气对CO还原NO的影响，进行了实验和动力学建模预测。实验在36kw燃烧反应器中进行，建模预测采用塞流反应器模型。在H2O存在下，自由基H的形成有利于NO的还原。H2O对NO排放的影响较为复杂：在T < 1100℃时，NO排放量随H2O含量的增加和温度的升高而降低，NO还原的反应途径为NO -> HNO -> NH -> N2O -> N-2， NO还原的控制因素为温度和H2O浓度；在1100℃< T < 1400℃时，NO排放量随H2O含量的增加而减少，在[H2O] < 1.0%时随温度的变化而保持不变，NO的还原取决于H2O浓度而不是温度，H2O浓度的增加使自由基H达到较高的平衡浓度；在T bb0 ~ 1400℃，温度和H2O含量对[H2O] < 1.0%的NO排放量的影响与T < 1100℃时相似，在[H2O] > ~ 1%时，NO排放量随H2O含量的增加而增加，随温度的升高而减少，NO的减少依赖于H和CO的联合作用。
The experiment and kinetic modeling prediction were conducted to investigate the effect of H2O vapor on NO reduction by CO. The experiment was performed in a 36-kW combustion reactor, and modeling prediction was done using the plug-flow reactor model. In the presence of H2O, the formation of free-radical H is conducive to NO reduction. H2O has a complex effect on NO emission: at T < 1100 degrees C, NO emission decreases with the increase of H2O content and temperature, the reaction pathway of NO reduction is NO -> HNO -> NH -> N2O -> N-2, and the controlling factors of NO reduction are temperature and H2O concentration; at 1100 degrees C < T < 1400 degrees C, NO emission decreases as the H2O content increases and remains constant with the change of temperature at [H2O] < 1.0%, NO reduction depends on H2O concentration rather than temperature, and increasing H2O concentration makes free-radical H reach high equilibrium concentration; at T > 1400 degrees C, the effects of H2O content and temperature on NO emission at [H2O] < 1.0% are similar to that at T < 1100 degrees C, NO emission increases with H2O content but decreases with temperature at [H2O] >1%, NO reduction depends on the combined effects of H and CO.