Effects of carbon dioxide dilution and composition on tip opening and OH radical distribution in laminar non-premixed Bunsen flame

2019 3rd International Workshop on Renewable Energy and Development

能源学;生态环境科学

Wang, Zhonghua^1 ; Tang, Qiang^1 ; Yang, Zhongqing^1 ; Li, Keliang^1

Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing

400030, China^1

关键词: Distribution area;    Kinetic simulation;    Mass diffusion;    Non-premixed;    Planar laser induced fluorescence techniques;    Production rates;    Relative concentration;    Residence time;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/267/3/032026/pdf
DOI  :  10.1088/1755-1315/267/3/032026

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Effects of CO2 dilution and composition on tip opening and flame OH radical distribution in laminar non-premixed Bunsen flame were investigated by using planar laser induced fluorescence (PLIF) technique. Experiments were conducted at different component fractions diluted with CO2 at 20%, 25%, and 30%. The syngas were produced by biomass catalytic gasifying. Stretch rates were calculated and combined with OH-PLIF images and simulation. We conducted kinetic simulation to analyze the production of OH radical. Results show that as VH2 increases and hydrogen slightly increases, the effect of mass diffusion is enhanced, in addition, the value of stretch rate decreases, and the tip opening becomes further obvious. The profile of OH radical distribution also becomes broad. Finally, the total production rates of OH radicals increases with a rate less than 7.5%. Hence, the maximum value of OH radical counts is reduced by 33.33%, 27.92%, and 23.09%. Nonetheless, with the increasing addition of CO2, the effect of mass diffusion is weakened; besides, chemical reaction residence time increases, and the value of stretch rate increases; the tip opening is less obvious. Although the distribution area of OH was narrowed, its production decreased and the relative concentration of all OH radical decreased.