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Show 0.08 . 3 006 m - 0.04 x" z 0.02 . 0.00 16 HiRam air/LNI N O x emissions; Conventional vs. LNI firing i i Conventional firing mm*-*^ LNI firing I 00 1700 1800 1900 2000 2100 2200 2300 2400 Temperature, F Figure 8 Recuperated Combustion Air The development platform for low to moderate air preheat burners was a high velocity version of a proven 1200F air capable burner with capacity range up to 40 MMBtu/h. A similar philosophy to that used for the ambient combustion air burner was followed in the investigation process, with the addition of investigation of the effects of varying the air preheat on the LNI performance. 0.1 0.08 . 3 2 | 0.06 . - 0.04 X O Z 0.02 0 . 191 4821-10-A N O x emissions vs. temperature 4 fuel jets, - 900 F air preheat, angle = 18 deg. i I m/\ Y^~^ I » L = 2 " _B_l = 4 - A - L = 5.3 DO 2000 2100 2200 2300 24 Temperature, F 00 Figure 9 0.1 0.08 0.06 -_ 0.04 x O Z 0.02 4821-10-A NOx emissions vs. temperature 130 F preheat _*_ 900 F preheat x 900 F preheat 3 i-*" Im^-xr ^^ fT e n - « r^S 1 •-• 1800 1900 2000 2100 2200 Temperature, F 2300 2400 Figure 10 10 |