Experimental and Numerical Study of the Effect of High Steam Concentration on the Oxidation of Methane and Ammonia during Oxy-Steam Combustion
Experimental and Numerical Study of the Effect of High Steam Concentration on the Oxidation of Methane and Ammonia during Oxy-Steam Combustion
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DOI：
10.1021/acs.energyfuels.6b00993
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发表时间：
2016-08
期刊：
影响因子：
5.3
通讯作者：
Yizhuo He;C. Zou;Yu Song;Wuzhong Chen;Huiqiao Jia;C. Zheng
中科院分区：
文献类型：
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作者：
Yizhuo He;C. Zou;Yu Song;Wuzhong Chen;Huiqiao Jia;C. Zheng
通过实验和数值研究了氧蒸汽燃烧过程中高浓度水对甲烷和氨氧化的影响。在流动反应器中进行了O2/N2和O2/H2O气氛的对比实验，大气压覆盖富贫燃料当量比，温度范围为973 ~ 1773 K。实验结果表明，在1300 K以上的温度下，高浓度H2O的存在显著抑制了CO的生成。高浓度水在化学计量和低燃料条件下抑制NO的形成，而在富燃料条件下促进NO的形成。该化学动力学机制的层次结构和更新，令人满意地再现了CO和NO形成的主要特征。高浓度的H2O显著地改变了自由基池的结构，并随之改变了CO和NO的形成。高于1300 K的超低CO浓度源于CO + OH的强化。
The effect of high H2O concentration during oxy-steam combustion on the oxidation of methane and ammonia was investigated both experimentally and numerically. Comparison experiments between O2/N2 and O2/H2O atmosphere were performed in a flow reactor at atmospheric pressure covering fuel-rich to fuel-lean equivalence ratios and temperatures from 973 to 1773 K. Experimental results showed that the presence of high H2O concentration dramatically suppressed CO formation at temperatures above 1300 K. High H2O concentrations inhibited NO formation under stoichiometric and fuel-lean conditions but enhanced NO formation under fuel-rich conditions. The chemical kinetic mechanism, which was hierarchically structured and updated, satisfactorily reproduced the main characteristics of CO and NO formation. High H2O concentrations significantly alter the structure of radical pool and subsequently the formation of CO and NO. Ultralow CO concentrations above 1300 K are attributed to the enhancement of CO + OH ⇄ CO2 + H b...