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Mathematical models of the thermal decomposition of coal: 3. Density, porosity and contraction behaviour

✍ Scribed by David Merrick

Publisher: Elsevier Science
Year: 1983
Tongue: English
Weight: 666 KB
Volume: 62
Category: Article
ISSN: 0016-2361
DOI: 10.1016/0016-2361(83)90224-7

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✦ Synopsis

Mathematical models are proposed to predict the true density of coal, semi-coke and coke and the porosity of a coke oven charge during carbonization. These models are combined in a further model which predicts the hitherto unexplained 'twin-peaked' contraction curve observed for semi-coke. It is found that the first contraction peak results from the relatively high rate of mass loss occurring towards the end of the primary devolatilization stage. The second peak occurs because of the increase in true density arising from the elimination of hydrogen from the semi-coke.

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