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Browsing by Subject "methane concentration"

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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Występowanie metanu w złożu węgla brunatnego KWB „Bełchatów” S.A.
    (2005) Macuda, Jan; Zawisza, Ludwik
    Gases in coal-bearing strata are accumulated both in the coal structure and in the pores of the accompanying rocks. They may take the form of free gases present in the fractures and porous spaces, or may be adsorbed in coal. Free gases make up ca. 1 to 5% of volume of all gases accumulated in the exploited coal seams. The authors present results of many years' analyses of methane concentration within the opencast KWB Bełchatów S.A. accounting for the geological conditions and advancement of mining works. Methane emission to the atmosphere greatly depends on dewatering of the field and the magnitude of the mined overburden and advancement. Dewatering of the rock mass preconditions methane migration through a system of fractures, pores with developed hydraulic contacts and fault zones. Another important factor responsible for increased methane emission is relaxation of the deposit strata while removing the overburden. This has been shown on the maps of changes methane concentration in the opencast area.