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A new apparatus to establish the spontaneous combustion propensity of coals and coal-shales

International Journal of Mining Science and Technology 2018年第4期28卷 643-649页

作者： M.Onifade B.Genc A.Carpede School of Mining Engineering University of the Witwatersrand

Coal and coal-shale both tend to undergo spontaneous combustion under favourable atmospheric conditions. The wits-Ehac index has been developed in South Africa since the late 1980's to test the spontaneous combustion liability of coal. However, in some cases, the wits-Ehac index fails to produce tangible results when testing coal-shales. To overcome this problem, a new apparatus has been developed to test carbonaceous materials such as coal and coal-shale under chemical reactions with oxygen and an index has been obtained. This index is called the wits-ct index. The equipment emulates the influence of oxygen adsorption on carbonaceous material for a period of 24 h without a heating *** wits-ct index uses the total carbon content of the sample and the temperature variations obtained from the samples during reaction with oxygen to predict the spontaneous combustion liability. Eighteen samples have been analyzed using both indices and the results are in-line. It was found that coals and coal-shales with higher values of the wits-ct index are more liable to spontaneous *** research on different coal-shales is underway in order to establish an extensive database for coal and coal-shales, together with known incidences of self-heating.

关键词： Coal Coal-shale Spontaneous combustion wits-Ehac index wits-ct index

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Modelling spontaneous combustion liability of carbonaceous materials

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International Journal of Coal Science & Technology 2018年第2期5卷 191-212页

作者： M. Onifade B. Genc The School of Mining Engineering University of the Witwatersrand Johannesburg 2050 South Africa

This paper presents predictive models to determine spontaneous combustion liability of carbonaceous materials （coals and coal-shales） using statistical analysis. The intrinsic properties and spontaneous combustion liability index were determined by testing 14 coals and 14 coal-shales from Witbank coalfields, South Africa. The relationship between these intrinsic properties （obtained from proximate, ultimate and petrographic analysis） and spontaneous combustion liability indices （the wits-Ehac index and wits-ct index） were established. The influence of the intrinsic properties of coal-shales in relation to coal properties affecting spontaneous combustion has been established using a statistical method. The linear regression analysis indicates better linear relationships between some of the selected intrinsic properties and spontaneous combustion liability index and thus, identifies the major intrinsic factors affecting their liability toward spontaneous combustion. It was found that a definite positive or negative correlation coefficient exists between the intrinsic factors and spontaneous combustion liability. A set of models to predict the spontaneous combustion liability was derived. The best significant correlation along with the most appropriate model as indicated by R-squared values, the coefficient of corre- lations and standard error was used to predict the incident of spontaneous combustion.

关键词： Coals Coal-shales Statistical analysis wits-Ehac index wits-ct index Spontaneous combustion

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