Numerical analysis of the effect of CO2 on combustion characteristics of laminar premixed methane/air flames

作者：Xiang, Longkai; Chu, Huaqiang^*; Ren, Fei; Gu, Mingyan

来源：Journal of the Energy Institute, 2019, 92(5): 1487-1501.

DOI：10.1016/j.joei.2018.06.018

• Biogas
• Equivalent ratio
• Reactive radicals
• Sensitivity analysis

The freely-propagating laminar premixed flames of (CH4+CO2)/air mixtures were calculated with the PREMIX code at various CO2 contents (0-0.35) and equivalence ratios (0.7-1.3). The chemical reaction mechanism GRI-Mech 3.0 was chosen to determine the effects of CO2 addition. The chemical effects of CO2 and the changes of the mole fraction on the important active radicals CH3, OH, H and O and the sensitivity of the main reactions contributing to their information were analyzed. The results show that with the increase of X-CO2, the laminar burning velocity and the adiabatic flame temperature are decreased. Moreover, the amount of NOx produced and the mole concentrations and the net rates of main reactions of CH3, OH, H and O also decrease as CO2 is added. The dominant reactions responsible for the four free radicals are R38 H + O-2 = OH + H, followed by R52 H + CH3 (+ M) = CH4 (+ M) and R35 H + O-2 + H2O = H2O + HO2.

• 出版日期2019-10
• 单位安徽工业大学