Flame structure investigations of oxy-fuel combustion
2012
Seepana, Sivaji | Jayanti, Sreenivas
The increased instability of CO₂ (or exhaust gas) recycled oxy-fuel flames is generally attributed to the increased specific heat of the gaseous mixture resulting in lower flame temperatures. In the present paper, we study the role of CO₂ addition through exhaust gas recirculation on the combustion chemistry of an oxy-methane flame. A flame structure analysis of various combinations of methane-oxidant flames has been carried out using the GRI 3.0 325-step mechanism. Further, comparative reaction rate analysis has been carried out under nitrogen and CO₂-dilutions to bring out the oxygen leakage in the two systems. These studies indicate that the presence of CO₂ in the oxidant has a profound effect on the reaction mechanism principally through two reactions, one involving the H radical and another involving the HO₂ radical, which become predominant in oxy-fuel combustion and contribute to the excessive oxygen leakage.
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