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Mineralogical Magazine; August 2003; v. 67; no. 4; p. 665-670; DOI: 10.1180/0026461036740125
© 2003 Mineralogical Society of Great Britain and Ireland
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Kinetic parameters associated with self-heating of New Zealand coals under adiabatic conditions

B. B. Beamish1,*, J. D. St. George2 and M. A. Barakat2

1 Division of Mining and Minerals Process Engineering, The University of Queensland, Brisbane 4072, Australia
2 Department of Civil and Resource Engineering, The University of Auckland, Auckland, New Zealand

* E-mail: b.beamish{at}minmet.uq.edu.au

Adiabatic self-heating tests were carried out on five New Zealand coal samples ranging in rank from lignite to high-volatile bituminous. Kinetic parameters of oxidation were obtained from the self-heating curves assuming Arrhenius behaviour. The activation energy E (kJ mol–1) and the pre-exponential factor A (s–1) were determined in the temperature range of 70–140°C. The activation energy exhibited a definite rank relationship with a minimum E of 55 kJ mol–1 occurring at a Suggate rank of ~6.2 corresponding to subbituminous C. Either side of this rank there was a noticeable increase in the activation energy indicating lower reactivity of the coal. A similar rank trend was also observed in the R70 self-heating rate index values that were taken from the initial portion of the self-heating curve from 40 to 70°C. From these results it is clear that the adiabatic method is capable of providing reliable kinetic parameters of coal oxidation.

KEYWORDS: coal, self-heating, adiabatic oven, activation energy




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Reviews in Engineering GeologyHome page
M. I. Nelson and X. D. Chen
Survey of experimental work on the self-heating and spontaneous combustion of coal
Reviews in Engineering Geology, January 1, 2007; 18(0): 31 - 83.
[Abstract] [Full Text] [PDF]




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