Soot formation in ethylene and propane diffusion flames

摘要: Small samples of gas have been withdrawn from the luminous regions diffusion flames ethylene and propane burning on a Wolfhard Parker burner these analysed by chromatography. In general, parent hydrocarbon is rapidly decomposed approaching within region, acetylene being major product found. The concentration falls near interface with oxidation zone suggesting that main oxidised in latter acetylene. The rates soot collection, uncorrected temperatures stable species also measured when oxygen, hydrogen respectively were added to fuel stream. Sooting flame ‘oxygen index’ ‘air’ supply was varied, it has found sooting rate for both fuels increases an increase index,’ falling off, however, at higher values. Oxygen, introduced into fuel, leads increased case but decreased propane. or oxygen as additives linearly area under profile (measured height ∼ 5 mm above burner). This proportional amount present this height, which corresponds roughly onset luminosity. Acetylene thus appears be via formed such flames. Propane additive behave differently although there temperature decreases. discrepancy remains unexplained requires further investigation.