Design of a Successful Low Emissions Burner

In anticipation of Government regulations on the emission of nitrogen oxides from industrial gas turbine engines, United Technologies Corporation has tested a burner for the FT4 engine which meets the proposed regulation of 75 PPMV NOx at 15 percent oxygen and 25 percent thermal efficiency. The design is based on predicted values of NOx as a function of flame temperature and verified the predictions. A two-phase combustion system is employed to provide the fuel-air ratio range required for engine operation without exceeding high flame temperature or lean flammability limits. A cast, finned construction is employed for durability and low cost. Current market economic considerations have required the program to be suspended.