Kinetic analysis on premixed oxy-fuel combustion of coal pyrolysis gas at ultra-rich conditions: Selective combustion and super-adiabatic flame temperatures

•SAFT occur at equivalence ratios larger than 3 and the magnitude is 294 K at ϕ = 8.•Non-equilibrium state is the main reason of SAFT for this pyrolysis gas.•Global net production of CO and H2 only occur ϕ = 1.5–8 and ϕ = 3–5.5.•Lack of H and the decreased temperature lead to the absence of H2 production peak.•Prevailing of HO2 and the long lasting OH attack lead to the global net consumption of CO at ϕ > 8.