Observation of coal fragmentation in early stages of combustion |
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Authors: | Cheol Hwan Lee Soo Young No |
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Affiliation: | 1. Department, of Environmental Engineering, Chungbuk National University, 360-763, Cheongju, Korea 2. Department of Agricultural Machinery Engineering, Chungbuk National University, 360-763, Cheongju, Korea
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Abstract: | Measurements of coal fragmentation in the early stages of combustion were undertaken in the size range of crushed coals for
Chinese Dongjin and Indonesian Roto coals. A flat flame burner fed with a premixed mixture of methane, air and partly hydrogen
was used for the burning of a single coal particles. A high speed video camera system was used for the observation of coal
fragmentation during approximately 80 msec. Fragmentation is consistently observed in the controlled combustion environment
over a gas flame temperature range of 1220K–1320K. The data indicate that a single coal particle often disintegrates into
two, three, and sometimes more fragments. The dominant mechanisim of fragmentation is that producing two fragments in primary
fragmentation. The Dongjin coal breaks up more extensively than the Roto coal with the frequency of fragmentation exhibiting
a strong particle size dependence and a weaker gas flame temperature dependence. The mean time of primary fragmentation for
the Dongjin coal falls to between 10 msec and 20 msec and does not remarkably vary with particle size and gas flame temperature.
The mean time of primary fragmentation for the Roto coal is strongly dependent on the particle size, whilst shows less gas
flame temperature dependence. |
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Keywords: | Coal Fragmentation Primary Fragmentation Fragmentation Frequency Mean Fragmentation Time High Speed Motion Analysis System |
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