FLAMELESS OXIDATION AT THE GT26 GAS TURBINE: NUMERICAL STUDY VIA FULL CHEMISTRY

Abstract

Sequential combustion was first applied to gas turbines more than 40 years ago, and almost half of these early machines are still operating. This form of oxidation leads to the flameless combustion at a second chamber. In GT26, the second stage combustor has 24 SEV burners which are similar in action to the well known ABB EV burner. In this paper, a 3D numerical simulation of the first EV combustor and the second SEV-combustor are performed for normal operating conditions (exhaust mass flow 542 kg/s, exhaust temperature 610⁰C). Physical modelling of the flameless oxidation is based on an original implementation of the GRI-MECH mechanism (325 chemical reactions) into the Fluent 5.4. Precise estimation of NO_x emission and other pollutants has been done.