Concerns about green house gas emissions have encouraged interest in hydrocarbon combustion techniques that can accommodate carbon dioxide capture and sequestration. Oxy-fuel combustion, where the fuel is combusted in oxygen diluted with steam or CO2, is seen as one promising approach. In this paper we focus on CO2 dilution effects and, in particular, on CO and O2 emissions from these flames. The emissions issue must be considered from a different perspective than conventional power plants as the combustor effluents will be sequestered, and, thus, their interactions with the terrestrial atmosphere are not relevant. Equilibrium CO emissions from CO2 diluted systems are much higher than conventional air systems. In addition, for carbon sequestration application, pipeline specifications impose limitations on CO and O2 levels which also must then be controlled. Equilibrium and kinetic modeling of CH4/O2/CO2 combustion systems was performed in order to analyze CO2 dilution effects upon CO and O2 emissions level. Companion experiments were also performed in an atmospheric pressure, swirl stabilized combustor. These numerical and experimental results quantify the strong dependence of emissions on stoichiometry, CO2 dilution and residence time.

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