Abstract
This paper describes the application of a recently described Fourier Transform Infrared (FT-IR) Emission and Transmission (E/T) technique to study coal flames produced in a transparent wall reactor. Comparisons are made for the ignition, soot formation, particle temperature and gas temperature for a number of coals varying in rank from lignite to low volatile bituminous. Samples of chars prepared at different temperatures and demineralized coals were also studied. Flame properties were compared with characteristics of the samples to determine the factors which control flame behavior. A comparison of the ignition of several samples suggests that the rate of ignition correlates with the initial rate of weight loss in air in a TGA experiment at lower temperatures. Ignition of chars is heterogeneous; ignition of high rank coals is homogeneous; but low rank coals exhibit both homogeneous and heterogeneous contributions to ignition. Soot formation in combustion correlates well with tar yield in pyrolysis suggesting that tar is the chief precursor of soot.
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