OCR Text |
Show 100 E a a. x" O z Rfl - .,. k o u 388: 60 40 20 ~"*$*~'"' 100% Load - • - 70% Load 50% Load 1700 Natural Gas Fired 1800 1900 2000 Adiabatic Flame Temperature, [K] Figure 5: EV Burner NOx: Effect of Load 2100 As for the E V burner, results show that N O x decreases with increasing flue gas percentage (Figure 6) for full load. Data for 3 % excess oxygen and varying preheats are indicated. Under full load conditions, the E V burner w a s stable even at F G R rates of in excess of 3 0 % . However, the m a x i m u m F G R is limited by the blowoff limit which is dependent on the total mass flow through the burner. The F G R temperature will affect the N O x emissions in so far as the peak flame temperature is affected. 103 Full Load CM O ^5 CO ® 10 E a a x" O z 2 _ 10' - -10.0 100- 02 3%, 400°F Preheat 02 3%, 300°F Preheat O2 3%, 200 F Preheat 02 3%, 100-150°F Preheat 300°F 0.0 10.0 20.0 30.0 Flue Gas Recirculation, % (Mfgr/Mcombair) Figure 6: EV Burner NOx: Effect of FGR 40.0 10 IV-24 |