Effect of pressure and stoichiometric air ratio on NOx emissions in gas turbine dump combustor with double cone burner

This work presents an experimental investigation of NOx emissions according to inlet air temperature (550-660K), stoichiometric air ratio (λ, 1.4-2.1), and elevated pressure (2-5bar) in a High Press Combustor (HPC) equipped with a double cone burner, which was designed by Pusan Clean Coal Center (PC3). The exhaust gas temperature and NOx emissions were measured at the end of the combustion chamber. The NOx emissions generally decreased as a function of increasing λ. On the other hand, NOx emissions were influenced by λ, inlet air temperature and pressure of the combustion chamber. In particular, when the inlet air temperature increased, the flammability limit was extended to leaner conditions. As a result, a higher adiabatic temperature and lower NOx emissions could be achieved under these operation conditions. The NOx emissions that were governed by thermal NOx were greatly increased under elevated pressures, and slightly increased at sufficiently low fuel concentrations (λ>1.8)