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Spectroscopic observations of methane-pulverized coal flames
Authors:J.J. Horvath  K.M. Pamidimukkala  W.B. Person  A.E.S. Green
Affiliation:Departments of Mechanical Engineering and Chemistry, University of Florida, Gainesville, FL 32611, U.S.A.
Abstract:A premixed laminar flame burner was used to study physical and chemical effects of burning methane and pulverized coal simultaneously. Spectral emissions obtained as a function of height in the flame, for OH, CH, C2, and CO were used to calculate excited state species number densities. Premixed methane-air flames with a number of equivalence ratios and methane-air-coal dust flames with three equivalence ratios were studied and differences were noted. Spatial temperatures were measured in all flames by means of a thermocouple probe.The introduction of a pulverized coal additive (30mg/min) leads to changes in OH, Ch, C2, and CO number densities and temperature at various heights, which depend on the stoichiometry of the methane-air flame. Possible chemical and physical mechanisms responsible for these changes are discussed qualitatively. The data pose a severe test for any quantitative model which includes the fluid dynamics, gas-phase chemistry, heterogeneous processes, and radiation transport.
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