Abstract
The paper describes the mechanisms of self-ignition formation in coal liable to spontaneous combustion, on the basis of experimental works performed to analyze heat and mass transfer in the coal-air system. A new approach was developed to the coal self-heating suppression and thermodynamic control of the oxidation process. The influence of coal moisture content and thermal behaviour of air in the cooling process was studied during moisture evaporation.
Highlights
For establishing the determining factors that favour oxidation and self-heating of coal, extensive studies were conducted to analyze the influence of combined parameters of air on reactivity of coal material, which has various natural moisture contents, in a laboratory environment and underground [1,2,3,4,5].It has been experimentally proved that self-heating of coal occurs at a relatively low rate of air filtration (3-7)·10-3 m/s, and the determining factor is its moisture exchange in the heterogeneous coal-air system, which is dependent on aerodynamic and thermo physical properties of air, and moisture content of coal
On the basis of theoretical and large-scale laboratory studies relating to heat and mass transfer in the coal-air system [6], it has been established that the mechanisms of self-ignition formed in the coal susceptible to spontaneous combustion, allowing for real-time factors, are as follows:
- At a coal temperature of 32-45 С and a rate of air filtration 4.7-6.0)·10-3 m/s, the decrease in moisture exchange takes place that results in initiating thermodynamic stabilization of the heterogeneous oxidation reaction in the coal compaction due to the deepening of evaporation area inside lumps of coal and the increasing of a moisture diffusion pathway;
Summary
Series: Materials Science and Engineering 142 (2016) 012111 doi:10.1088/1757-899X/142/1/012111. A Technique for Decreasing Reactivity of Coal Material to Suppress the Oxygen Absorption Process. Yurga Institute of Technology (affiliate) of National Research Tomsk Polytechnic University.
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