Comparison of oxy-fuel combustion kinetic mechanisms of methane by laminar burning velocity under normal conditions

Power energy sector is the largest anthropogenic source of greenhouse gas emissions, including CO2. Oxy-fuel energy complexes (OFCs) are one of the most effective ways to reduce CO2 emissions. In OFC’s combustion chamber gaseous fuel is burned in a mixture of O2 and CO2 at supercritical pressures up to 300 atm. However, in open sources there are currently no recommendations for designing such combustion chambers, including no recommendations on the choice of a kinetic mechanism for numerical simulation of combustion. In this paper, the kinetic combustion mechanisms GRI 3.0, UoS sCO2 2.0, OXY-NG, and Skeletal were compared using Chemkin 18.2 for oxy-fuel combustion of methane by laminar burning velocity under normal conditions. It is shown that OXY-NG can accurately simulate the laminar burning velocity during oxy-fuel combustion of methane under normal conditions in a wide range of mixture compositions by (α) 0.8–1.4 and (γCO2) 0.65–0.78. For this reason, OXY-NG mechanism is recommended for spatial numerical simulation of oxy-fuel combustion.