Abstract
Under reducing conditions, H2S, which will result in the high temperature corrosion of fireside water wall, is predominant sulfur compounds discharged from the coal. Influences of temperature and oxygen on the transformation mechanism of H2S were studied by chemical kinetics. It is concluded from the study that the main productions of H2S vary with the reaction conditions, COS is mainly produced in highly reducing conditions and SO2 is dominant production under oxidizing atmosphere. Peak concentration of S2 only can be obtained at mildly reducing conditions and moderate temperature; meanwhile, most of H2S is oxidized to SO2 when the temperature is above 1300K. A turning point is found when the concentration of O2 is about 2%, and simulation results comply with experimental measurements.
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