Mining of Mineral Deposits

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ISSN 2415-3435 (Print)

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Elaborating a scheme for mine methane capturing while developing coal gas seams

Yevhenii Koroviaka1, Jan Pinka2, Svitlana Tymchenko1, Valerii Rastsvietaiev1, Vitalii Astakhov3, Olena Dmytruk3

1Dnipro University of Technology, Dnipro, 49005, Ukraine

2Technical University of Kosice, Kosice, 04200, Slovakia

3LLC “Avior-Dnipro”, Dnipro, 49033, Ukraine

Min. miner. depos. 2020, 14(3):21-27

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      Purpose is to substantiate and develop an efficient scheme of coalmine methane capture while preparing and developing gassy coal seams.

      Methods. Critical analysis of literature sources has been carried out; practice of applying the known schemes of coalmine methane capture for its further use has been systematized. Analysis and selection of theoretical substantiation of a new coalmine methane capture scheme have been performed taking into consideration the parameters of preparation and deve-lopment of gassy coal seams. Methods of mathematical analysis have been applied to describe the dependence of gamma distribution of the continuous random variable of gas emission intensity on the distance to a stope.

      Findings. A scheme of coal mass degassing has been improved; that scheme helps increase degassing degree and eliminate colliery gas, including methane, in terms of specific arrangement of wells and introduction of new technological operations and parameters. The developed scheme takes into consideration physical and mathematical properties of rocks to increase the volume of produced gas along with the reduced total mining costs. Mathematical modeling has made it possible to define that the density function coincides maximally with the experimental and practical graph of dependence of gas emission intensity on the distance to a stope.

      Originality.Analytical dependences have been specified making it possible to evaluate rational range of the depth of degassing gas outlet wells and the distance between them according to the proposed scheme of their arrangement within the extraction pillar.

      Practical implications. The proposed scheme of coal mass degassing allows controlling coalmine methane extraction including special preparatory operations. It helps widen a range of effective application of the system for colliery gas extraction and reduce the time for preparatory degassing operations; that favours both rising stope output and the associated coalmine methane recovery with the corresponding increase in energy saving and safety during mining operations.

      Keywords: capture, methane, coal seam, degassing, coal mass, well


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