Demonstration of Extended Operating Range of Ultra-Low NO{sub}x Emissions of a Liquid-Fueled Gas Turbine Combustor by 'LL2' Combustion Concept0

摘要

The lean-lean two-stage (LL2) combustion concept using the reactions of lean to ultra-lean premixed mixtures injected into the hot burned gas produced in the lean-burn primary stage has the potential to extend the ultra-low NO{sub}x operating range of gas turbines. A tubular model combustor for a simple cycle 200 kW gas turbine was designed based on this concept. Two secondary mixture injection tubes with a flow deflector at the exit, extending into the primary combustion zone, were used to inject lean premixed prevaporized kerosene-air mixtures of various fuel concentrations into a mass of hot burned gas produced by the lean burn primary burners. The emissions and combustion characteristics were evaluated at the full power conditions of the gas turbine, at 600 K inlet air temperature and 0.8 MPa pressure, for two sizes of mixture injection tubes.