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Show OOr---------------------------------~ 17Ju~1990 3.9x IiJ6B1u/h, 0 PJlotON 50 ~ Pilot OFF () Pilot ON, FGR 15 40 18July 1990 3.9 x lOS BIu/h, cr 0 Pilot ON tl- C") [J Pilot ON, FGR 15 ~ 30 E • Pilot ON, FGR 30 0- 0- [;jjjJ Pilot ON, FGR 50 0 Z ~ 4.4 x 10fSatu/hr, Pilot 20 6.6x lo'BIu/h, .L1 Pilot ON ~ Pilot ON, FGR 15 10 ~ Pilot ON, FGR 30 ~ Pilot ON, FGR 50 o ~------------------~------~----~ 1,100 1,200 1,300 1,400 1,500 1,600 WJS1005B.DRO Flame Temp., 375 mm rC) Figure 6 The Influence of Flame Temperature on NOx Emissions. The influence of a "flame temperature" on NOx emissions is shown in Figure 6. The flame temperature used is the value measured by the suction pyrometer at 375 mm from the quarl. These temperatures provided a relative measure of NOx emission and correlated with the calculated adiabatic flame temperatures shown in Figure 7. The NOx emissions decreases with decreasing "flame temperature". At a "flame temperature" 375 mm from the quarl of 1200°C the NOx emissions is 12 ppm (d, 3% O2). The NOx emissions increases to 50 ppm (d, 3% O2) at "flame temperatures" greater than 1400°C. Flue gas recirculation reduces the NOx emissions further at a gIven "flame temperature". However, the greatest reduction in NOx emissions occurs at high "flame temperatures" and between 0 and 10 percent flue gas recirculation. Difference in NOx emissions between 10 and 20 percent flue gas recirculation are small and between 20 and 30 percent recirculation are within the scatter of the data. 13 WJSlOO5A.PAOj AFRC-90-25 |