Future energy systems based on solid fuel gasification for co-production of power and fuels may require gas turbine operation on unusual gas fuel mixtures. In addition, global climate change concerns may dictate the production of a CO2 product stream for end-use or sequestration, with potential impacts on the oxidizer used in the gas turbine. In this study the operation at atmospheric pressure of a small, optically accessible swirl-stabilized premixed combustor is investigated when burning fuels ranging from pure methane to shifted or filtered syngas mixtures. Both air and CO2-diluted oxygen are used as oxidizers. CO and NOx emissions for these flames have been determined over the full operation range from lean blowout to slightly rich conditions. In practice, CO2-diluted oxygen systems will likely be operated close to stoichiometric conditions to minimize oxygen consumption. The presence of hydrogen in the syngas fuel mixtures results in compact, high temperature flames, resulting in increased flame stability and higher NOx emissions. The lean blowout limit decreases with increasing H2 content in the syngas. Similarly, CO emissions for lean stoichiometries decrease with increasing H2 content. CO emissions near the stoichiometric combustion point do not become significant until φ > 0.95, at which point CO emissions rise more rapidly for combustion in O2-CO2 mixtures than for combustion in air.

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