Development of a Mathematical Model for Simulating the Self-Heating Behavior of Moist Coal

ABSTRACT

Oxidation of fresh coal in the low-temperature region involves a series of processes. This starts with the adsorption of oxygen on the available fresh coal pore surfaces and continues with the high rate oxidation of coal. A new reaction kinetics expression has been proposed covering the whole low-temperature region of coal self-heating. Also, a comprehensive evaporation/drying model has been developed and validated to express the moisture removal rate of coal during self-heating. By combining these two improvements for describing the self-heating process a more robust mathematical model has been developed. Calculations have been carried out using an arbitrary-precision arithmetic algorithm in MATLAB. The model predictions have been validated by the actual moist coal self-heating behavior in an adiabatic oven.

KEYWORDS:

• Coal self-heating incubation
• coal reaction kinetics
• coal drying kinetics
• low-temperature oxidation

Nomenclature

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Declaration of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.