Modeling of NO sub(x) conversion during combustion under high CO sub(2) concentration using detailed chemical kinetics

• Published in: Fuel processing technology 2011-05, Vol.92 (5), p.939-945
• Main Authors: Zhao, Ran, Liu, Hao, Zhong, Xiaojiao, Wang, Zijian, Hu, Han, Qiu, Jianrong
• Format: Article
• Language: English
• ISSN: 0378-3820
• DOI: 10.1016/j.fuproc.2010.12.014

Combustion of fuels under enhanced oxygen atmospheres has been well investigated over the past decades in various types of combustors, varying from diesel engines to coal-fired boilers. Most studies have found significantly lower NO sub(x) emissions during Oxy-coal combustion. In this paper, NO sub(x) combustion chemistry under O sub(2)/CO sub(2) atmosphere as well as air atmosphere was studied using detailed kinetic model. A suitable reaction mechanism was chosen based on the comparison between the calculation result and the experimental data. The influence of various parameters (temperature, CO sub(2) concentration) on NO sub(x) conversion was investigated. The chemical effects of high CO sub(2) concentration on NO formation and destruction process was studied. On the basis of investigations through elementary chemical reactions, it can be concluded that high CO sub(2) concentration play a pronounced role on NO sub(x) conversion process. Moreover, the dominant reaction steps contribution to production and destruction of NO as well as the most important reactions for NO reduction under different atmospheres were discussed.