The microstructure of H2S-O2 flames has been developed in terms of composition and temperature profiles. With the aid of these profiles, rates of formation of SO2 and SO3 are reported and discussed. With the aid of kinetics and thermodynamic data developed for the principal reaction steps, it is shown that a major part of the SO3-problem may be related to the O-atom oxidation of SO2 in the flame. These fundamental studies of thermochemical reactions provide the basic information needed as the next step in understanding how reactions in flames and on surfaces affect external corrosion and deposits in boiler furnaces.

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