Chemical conversion of SO2 in low-temperature and low-pressure oxyhydrogen flames. 1. Kinetic analysis of the process

Variety of Kinetic Manifestations of Branched Chain Reactions

“…When it is implemented in the mode of low-temperature rarefied flames of hydrogen-oxygen mixtures, hydrogen atoms accumulate in the highest concentrations [6,37,38]. SO 2 additions to the reacting mixture in this mode undergo chemical transformation with the formation of elemental sulfur [39][40][41][42][43][44][45] and lead to the emergence of a new phenomenon called intermittent flames (Figs. 7, 8).…”

“…in[39,40]. The analysis shows that under the conditions of a rarefied flame of a hydrogen-oxygen mixture, the hydrogen atoms become attached to the SO 2 , forming HSO 2 particles, which then decay based on the bimolecular reaction of the reagents: HSO 2 + M → SO + OH + M. Then the SO particles in the quadratic reaction SO + SO → S + SO 2 form the sulfur atoms.…”

The Conversion of SO2 by Hydrogen Oxidation Branching Vhain Reaction

“…The inhibitory effect of sulfur dioxide on the high temperature combustion processes has not been observed in the studies of low temperature rarefied flames of oxyhydrogen mixtures [6]. Thus, under these conditions, the fact of intensive chemical conversion of sulfur dioxide into elemental sulfur has been established [7][8][9]. Both a detailed kinetic analysis of the conjugate process of SO2 conversion under the effect of hydrogen oxidation chain reaction and all the possible elementary reactions with atoms and free radicals have shown that the chemical conversion of SO2 additives under the conditions of low temperature rarefied flames has an accelerating effect on the development of hydrogen oxidation chain reaction and development of the conjugate process on the whole [6].…”