A semi-closed oxy-fuel retrofit gas turbine demonstration plant (DEMOXYT) is described and preliminary results of the oxy-fuel burner under relevant conditions are presented. The plant consists of a 100 kW_(el) radial turbine with a pressure ratio of 4.25, featuring a recuperator, to which a specific oxy-fuel burner has been designed and constructed, and a condensing scrubber in the flue gas recirculation loop. An overview and salient thermodynamic data of the plant are provided, as well as important parameters governing its limits of operation. Results from combustion experiments obtained in a pressurized oxy-fuel combustor are presented in terms of a burner operation map for 4.2 bar. The combustion testing results describe the stability maps of the burner and the influence of excess oxygen and total oxygen concentration in the reactants on the formation of CO. It was found that excess oxygen values below about 5% could result in excessive CO concentrations in the undiluted product gases of the flame, but that CO formation was relatively independent of the oxygen concentration in the reactants.
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