| OCR Text |
Show NO. Control Strategy American Flame Research Committee 1992 Fall International Symposium October 19-21, 1992 The highest fonnation rates of NO were found in a region in which the flame temperature peaked (-1450~C) and the hydrocarbon species concentrations were low. However, since the peak temperature in the secondary lean zone was relatively low due to FGR and the secondary flame phenomenon, l~w NO, formation rates persisted throughout the fuel-lean zone. TIle flame data developed to date show that by staging the combustion air, recirculating flue gas through the primary stage, and optimizing the orientation of the secondary air jets, low emission levels of NO, can be achieved throughout the entire flame envelope. \~ |
