Research Of NO Homogeneous Mechanism In CH₄ Flame Under O₂/CO₂ Atmosphere

Oxy-fuel combustion is a new technology which aimed at the control of CO₂ emission. But during the research find out that, comparing to normal combustion situation, the new combustion technology can effectively reduce the NOx emission. It's based on the special reaction atmosphere and progress. The detailed reaction mechanism is still not quilt clear yet.Considering to the complex of the combustion progress, the research of detailed reaction mechanism should be step by step, and this paper is focused on the fundamental research of NO homogeneous mechanism in the flame of CH4 under the atmosphere of O₂/CO₂. The numerical modeling of detailed NO homogeneous mechanism under O₂/CO₂ atmosphere refers to the experimental data from literature; use the PRR reactor with the help of homogeneous mechanism data. With the post progress tools of sensitivity analysis and the rate of production analysis, the path of reaction were created which helps to analyze the reaction mechanism visually.The result shows that: the Sarma08 mechanism is adapt to the subject investigated; in the low O₂ condition, the increase of CO₂ concentration makes the function of NO reduction by hydrocarbon stronger, the trend is opposite under high O₂ condition; under the reducing atmosphere, the reduction of NO shows to be the function of directly reduction, under the oxidizing atmosphere the reduction of NO shows to be both the function of directly reduction and indirectly reduction of hydrocarbon; in the reducing atmosphere, the NO reduction rate increase with the initial NO concentration, the trend is opposite under oxidizing atmosphere; the NO reduction rate decrease with theλ; the NO reduction rate decrease with the ratio of CO₂; with considering of recycle flue gas, the NO reduction rate decrease with the initial NO concentration,λand ratio of CO₂.