文献类型：会议论文

英文题名：Numerical study on formation mechanism and reduction methods of NOX in methane/oxygen-enriched air diffusion flame

作者：Feng, Yaoxun[1]; Zheng, Xiaofeng[1]; Jia, Mingsheng[1]

机构：[1] Engineering College, Guangdong Ocean University, Zhanjiang Guangdong, 524088, China

会议论文集：Progress in Materials and Processes

会议日期：September 22, 2012 - September 23, 2012

会议地点：Guangzhou, China

语种：英文

外文关键词：Combustion - Oxygen - Carbon dioxide - Diffusion - Numerical methods - Nitrogen oxides - Chemical analysis - Inert gases - Reduction

外文摘要：In this study, a methane/oxygen-enriched air counterflow diffusion flame was analyzed numerically using detailed chemical kinetics, on the condition that the oxygen mass fraction in the oxidizer stream varied from 21% to 99%. The obtained results show that as the oxygen concentration in air increases, the maximum temperature increases; the region of combustion reaction is gradually divided into two parts, and the total NO production rate and especially the thermal NO production rate increase greatly. With consideration of the possibility of gas recirculation to minimize NOX in the industrial combustor, the usefulness of NOX reduction in combustion was analyzed numerically when the methane stream was diluted with the inert gases N2 or CO2. The obtained results show that the flame structure and dominant mechanism of NO formation change greatly with the concentration of diluents in fuel; the emission index of NO decreases gradually when the concentration of diluent CO2 increases. ? (2013) Trans Tech Publications, Switzerland.