Abstract
Samples from New Zealand and Australia have been tested in an adiabatic oven to assess the effect of rank on the R 70 self-heating rate of coal. A non-linear relationship can be defined for coals from both countries using the revised Suggate rank ( S r) parameter. Subbituminous coals have the highest R 70 self-heating rate values, which are 20 times that of high volatile A bituminous coals on a dry mineral matter free basis (∼ 1 cf. 20 °C h − 1). However, the moderating effects of moisture and mineral matter can reduce this difference to only 2–3 times for coal in-situ.
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