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In this paper, we intensively investigate the influence of steam on the hetero-homogeneous joint ignition of dispersed coal particle streams in both O2/N2 and O2/CO2 conditions of an optically accessible flat-flame burner. Two differently ranked coals and one bituminous char were tested for a comparison. The effects of moisture content in the raw coal, steam content or diluents (N2/CO2) in the ambience,...
An experimental and theoretical investigation is conducted on the combustion of pulverized coal particle streams in either conventional or oxy-fuel conditions. The laboratory setup consisted of a Hencken flat-flame burner operated at the same temperatures of 1200, 1500 and 1800K in N2 and CO2 environments. The visible light detection technique and the calibrated three-color pyrometry are separately...
Two in situ optic methods on CH∗ chemiluminescence and coal particle temperature, are newly applied to investigate the devolatilization/homogeneous and heterogeneous ignition behaviors of dispersed coal particle streams, with ambient temperature from 1200K to 1800K and oxygen mole fractions from 10% to 30%. The dispersed coal particles of 65–74μm are injected into an optical Hencken flat-flame burner...
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