Enhancement of Fuel-Nitrogen Oxidation by Fuel-Sulfur in Fuel Rich Flames

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Abstract
C2H2/O2/Ar and H2/O2/Ar premixed, laminar, one-dimensional flames, seeded with small amounts of fuel-N (C2N2) and fuel-S(SO2) and burning at 1 atm were investigated in order to gather information concerning fuel-S/fuel-N interactions in combustion systems. Temperature and nitric oxide profiles were obtained from the burner surface to 5 cm down-stream (—∼56 ms residence time). Large increases in fuel-NO emissions were observed due to SO2 addition to the premixed gases (up to 60 percent for acetylene and 140 percent for hydrogen flames at equivalence ratios of 1.2). The enhancement of NO emissions is analysed in terms of the possible interactions of sulfurous species with the fuel-nitrogen oxidation mechanism. Results are compared with those obtained previously in methane flames, and found to show reasonable qualitative agreement. The effect of SO2 addition on flame temperature is also discussed in terms of sulfur species equilibrium in the flame and the effect of flame inhibition (via sulfur catalyzed recombination of chain carriers) in conjunction with the method of flame stabilization utilized.