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Show 900 BOO 700 E 600 QQ.. 500 zD 400 300 200 100 0 0 · ................ ~ ........................ ~ ............ ; ................... L ......... r. = . ~ .255 · K ...... ···· ~ 3 with BOP ppm N~3 ~ .............. ' ·················1················· ; ············~················· .. t·········i·· ........... ~ ..... . ................. .;. .................. ~ ...................................... : .. -.............. ! ....... -....... -... ~ ..... . 11 - initiaj NO level j l ~ ~ -i- - -i- .. __ , _ ., . . 1 2 - 100;0 reburning withoTtN~ ~ __ .1 .. . •• .....•.. . . , ... . ... .... ......... .,: .• ••• •••• •• •• •. •••. ; •• • •• • •••••. .. ..••• : . . ••••• ••• •••••• ••. : •.. •...•. ••.. ••.... t .... . . l ; j l j ~ _.. ........... :j_ ............ 25!Z.. ppm. \'N; O..LJ\.,u. :\@ Q.1s. \ :r.1:U'~f' .. •• j •• ~~ .•••• ............. i······· .. ·Fwitn·sOlrppmiNH;··@·Q":rs····+·· .................! .. .................! .. .............. ···r···················r·················-r··················r······ 0.25 0.5 0.75 Time, S 1 1.25 1.5 Figure 14. Modeling the effect of ammonia in the rebuming zone (without OFA): 1 - initial NO level, 2 - 10% rebuming without ammonia, 3 - 800 ppm NH3 is added simultaneously with the reburning fuel, 4 - 800 ppm ammonia is added into the rebuming zone with 0.1 s delay time. TFN concentration (NO+NH3=257 ppm) is shown at 1.5 s (the time of OF A injection at 1255 K). E Q. Q. C .2 C6 ~ C Q) 0 c 0 u . ' . 250 - - -- - _:- - - :- .. .. '1"':" i{NO+NH3) level without promoter , ~ ~ , : .. 200 .................. ·······1·······························:·······························f··········· ............... . 150 100 50 ................................. ~ ............................... ~ ............... -.............. ~ .............................. . o+-------~--------~------~------~ B.5 9.5 10.5 Log A 11 .5 12.5 Figure 15. Modeling of the promotion effect at different predexponential factors A. NO and NH3 concentrations are shown at t = 1.5 s for injection of 800 ppm ammonia and 100 ppm promoter into the rebuming zone with a 0.1 s delay time. 1 - TFN level without promoter, 2 - NO concentration before OFA injection, 3 -1FN concentration (NO+NH3) before OFA injection, 4 - NO level after OF A injection. 23 |