Effect of SO2 on the Chain Reaction of Hydrogen Oxidation: Intermittent Flames
A. A. Mantashyan, E. M. Makaryan, A. M. Avetisyan, A. A. Arutyunyan, G. M. Gevorgyan
Nalbandyan Institute of Chemical Physics, National Academy of Sciences, Erevan, 0014 Republic of Armenia
Keywords: autoignition of hydrogen, intermittent flame, chain reactions, sulfur dioxide
Abstract
The effect of SO2 on the chain reaction of hydrogen oxidation in the autoignition region (T = 470–510 oC and p < 200 torr) is studied. In the absence of SO2 under flow conditions, the process occurs in a low-temperature flame mode with a characteristic pale blue glow. With the addition of sulfur dioxide, SO2 is transformed to elemental sulfur and a new phenomenon is observed. At a small contact time (less than 4–5 s), the process enters the mode of intermittent flames. Dependences of the rate and intensity of light flashes on pressure, temperature, and contact time are studied. An interpretation of the observed phenomenon is given.
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