Numerical investigation on the effect of CO2 and steam for the H2 intermediate formation and NOX emission in laminar premixed methane/air flames |
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Affiliation: | 1. School of Energy and Environment, Anhui University of Technology, Ma''anshan 243002, China;2. Key Laboratory of Metallurgical Emission Reduction and Resources Recycling, Anhui University of Technology, Ministry of Education Ma''anshan 243002, China;1. School of Energy and Environment, Anhui University of Technology, Ma''anshan 243002, China;2. School of Energy & Power Engineering, Jiangsu University, Zhenjiang 212013, China;3. Department of Automobile Engineering, Changshu Institute of Technology, Changshu 215500, China |
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Abstract: | One-dimensional premixed freely-propagating flames for (CH4+CO2/H2O)/air(79%N2+21%O2) mixtures were modeled using ChemkinⅡ/Premix Code with the detailed mechanism GRI-Mech 3.0. The investigation of the effects of CO2 and steam addition on the H2 intermediate formation and NO emission was conducted at the initial conditions of 1 atm and 398 K. Both physical and chemical effects of CO2, H2O on laminar burning velocities and adiabatic flame temperatures were also analyzed. The calculations show that with the increase of αCO2 and αH2O, both physical and chemical effects of CO2 and H2O result in the reduction of laminar burning velocities (LBVs) and adiabatic flame temperatures (AFTs) in which the chemical effects of CO2 addition are more significantly than H2O. Especially, the chemical effects of steam promote the increase of AFTs and the influence in rich BG65 flames are larger than in methane. With a proper amount of H2O addition, the chemical effects of H2O on the peak concentration of H2 are more significantly than physical at Φ = 1.2. Moreover, CO2, steam and their mixture addition have significant reduction on the NO emission. The most sensitive reaction for the formation of H2 and NO emission were determined. The responsible reactions for H2 formation and NO emission are R84 OH + H2 <=> H + H2O and R240 CH + N2 <=> HCN + N (a prompt routine), respectively. |
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Keywords: | Methane BG65 Steam Chemical effects |
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