Experimental investigation in indices of coal dust explosiveness
The experimental investigations in dynamics of volatile substances emission, as one of the main indicators of explosiveness of coal dust are considered. The isothermal and dynamic thermogravimetric investigation methods of dust sample of various coal grades, derivative thermogravimetry, as well as the thermal analysis method combined with the combustible gas analyzer are applied. The temperature ranges of maximum output and also the modal value of emission rate of volatile substances for various coal grades are determined. The effect of heat atmosphere, dust dispersity and ash content on the reaction behaviour is investigated. There is established experimentally the significant change in emission of volatile substances from the dust deposited on the network of mine workings in relation to the results of laboratory tests according to standard procedure. Results of the work are aimed at formation of the methods for rapid identification of potential explosiveness of mine dust (including following types: coal, rock dusting, coal layered and involved in initial explosion).