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REDUCING OF SELF-HEATING COAL STOCKPILE FOR PREVENTION AN ENVIRONMENTAL HAZARD
Abstract
Self-heating and autoignition are the precursors of spontaneous combustion. All coals can be self-heat in mines or in storage; but only if the conditions are favourable they may autoignite, when the coal interact with the oxygen in the air. This is first step in the spontaneous combustion. In storage, the temperature of a stockpile is determined by the type of coal, particle size, oxygen concentration of the air, balance of the heat of coal oxidation, moisture content of the coal etc. Coal naturally oxidizes over time. This causes an exothermic reaction that produces heat. The heat generation and dissipation capacities of a coal depend on a number of factors. In the paper have been identified several variables which may affect generate the self-heating of the coal. Interactions betwenn these variables can determines the occurence or non occurence of spontaneous combustion. Also is described mechanism of the chemical reactions. This is a slow process, which can last at several hours to many weeks. The gaseous products can have a large impact on human health, especially for local residents close to the burning sites.
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