Journal of the Mining and Metallurgical Institute of Japan
Online ISSN : 2185-6729
Print ISSN : 0369-4194
Spontaneous Combustion of Coal in The Low Temperature Range
Application of exposure equivalent-time to numerical analysis
Kyuro SASAKIHiroshi MIYAKOSHIKazuo OTSUKA
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1987 Volume 103 Issue 1197 Pages 771-775

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Abstract

This paper describes calculations concerning temperature-rise and the oxygen diffusion processes of a coal seam in the low temperature range.
The temperature rise of coal occurs by the accumulation of the heat produced by oxidation on the coal surface. The heat generation rate is a function of temperature, oxygen concentration and the exposure time of coal in an oxygen atmosphere.
For the case where the oxygen concentration and the temperature around the coals vary with time, we have proposed a new method for estimating heat generation rate. We have called this new method “exposure equivalent-time”. This new method was applied successfully to simulate the temperature and the oxygen concentration in the coal seam model whose open-ends are exposed to the air. The finite-difference method was used to solve the equations of heat conduction and diffusion of air.

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