Doped methane flames ammonia

Ammonia-doped methane flames, 96-98 Ammonia flame... 

Rahinov, I., Goldman, A., and Cheskis, S., Absorption spectroscopy diagnostics of amidogen in ammonia-doped methane/air flames. Combust. Flame, 145, 105, 2006. 

In this paper we first summarize the ability of the NH kinetic mechanism of Dasch and Blint ( ) to describe the major properties of ammonia-oxygen-diluent flames. This mechanism is constructed solely from literature rate constants and is specifically valid only for flames leaner than 0=1.2 Having validated the ammonia mechanism, we then investigate the yield of NO from methane-air flames which have been doped with NH3 and NO. The NH3 doped... 

Pure ammonia flames are studied experimentally and theoretically to isolate the amine chemistry. Ammonia and NO doped methane-air flames are also studied as models for flames with fuel-bound nitrogen and flames diluted with NO from EGR. We conclude from these studies ... 

NO alone doped into methane flames is only reduced by the slow three-reaction Zeldovitch mechanism. No appreciable reduction due to the ammonia reaction mechanism is found. 

Contrary to pure ammonia combustion where the primary source of N2 comes from reactions of NH2 with NO, ammonia doped into methane-air flames is combusted to N2 via the N + NO reaction. 

Having validated the mechanism on ammonia-oxygen flames, the yield of NO from nitrogen doped CH4-air flames was examined. Both NH3 and NO doping were investigated. Only post-flame NO concentrations were measured. These are compared with calculations of the full kinetics and with adiabatic equilibrium calculations. The calculated profiles indicate the complexity of the NO dynamics in these flames. The temperature and major species profiles in the undoped flames had been studied in earlier work( ). Three near stoichiometric methane-air flames having initial equivalence ratios(0) of 0.8, 1.0 and 1.2 are diluted with less than 5 volume percents of NH3 or NO. In this section NO concentration is expressed both as a mole fraction and as a fraction of the total nitrogen concentration ... 

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