Second-generation low-emission combustors for ABB gas turbines: Field measurements with GT11N-EV

Abstract

In February 1991 a type GT11N gas turbine (Midland U.S.A.) was retrofitted with ABB's new EV-Silo-Combustor. Tests were then carried out to examine the operation concept, to demonstrate the technical reliability and to confirm the low emission performance of this new technology. This paper will describe: 1.) The combustor design: - one single silo combustor mounted on the turbine and equipped with 37 EV-burners. 2.) The results of the extensive field measurements: The operation concept (lean premix combustion without any pilot diffusion flames, 7 burner groups) is simple and reliable: - The emission targets NOx < 25 ppmv (15% O2, natural gas) CO < 8 ppmv UHC < 5 ppmv were reached. NOx-values are even lower than 15 ppmv at base load. - The NOx-predictions for the GT11N-EV, based on the results of high pressure tests in Cologne (ASME PAPER 90-GT-308), compare very well with the results of field measurements.