Transient States in the Flow of the Air-Methane Mixture at the Longwall Outlet, Induced by a Sudden Methane Outflow

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Abstract

The paper discusses the results of the numerical simulation of a sudden outflow of the air-methane mixture from behind a powered support, for a longwall ventilated by means of the U-type ventilation system. The calculations were performed using the geometrical model of an actual longwall - the I 100 longwall at the „Sośnica” hard coal mine. The steady state of the air flow in the area of the upper corner was discussed, together with the phenomenon of methane seepage from the goaf area in the vicinity of the longwall outlet. Subsequently, the phenomenon of a sudden methane outflow - followed by the ventilation of headings - was introduced into the study. The obtained results confirm the knowledge provided by the mining practice and experience

Branny M., 2006. Computer Simulation of Flow of Air and Methane Mixture in the Longwall - Return Crossing Zone. Arch. Min. Sci., Vol. 51, No 1, p. 133-145.

Dziurzyński W., Krause E., 2012. Influence of the Field of Aerodynamic Potentials and Surroundings of Goaf on Methane Hazard in Longwall N-12 in Seam 329/1, 329/1-2 in “Krupiński” Coal Mine. Arch. Min. Sci., Vol. 57, No 4, p. 819-830.

Krawczyk J., Wasilewski S., 2009. Migration of Methane into Longwall and Tailgate Crossing. Proceedings of the Ninth International Mine ventilation Congress, India, p. 483-493.

Cybulski K., Krause E., Wierzbiński K., 2008. Modelling of methane concentration distribution in region of ventilation roadway crossing with longwall. Proc. of the 21st World Mining Congress, Underground Mine Environment, p. 29-40.

Krause E., Łukowicz K., 2009. Wpływ struktury kopalnianej sieci wentylacyjnej na skuteczność ujęcia metanu. Prace Naukowe GIG Górnictwo i Środowisko, s. 95-108.

Krause E., 2009. Ocena i zwalczanie zagrożenia metanowego w kopalniach węgla kamiennego. Praca habilitacyjna.

Główny Instytut Górnictwa, Katowice.

Szlązak N., Kubaczka C. 2012. Impact of coal output concentration on methane emission to longwall faces. Arch. Min. Sci., Vol. 57, No 1, p. 3-21.

Skotniczyny P., 2013. Three-dimensional numerical simulation for the mass exchange between longwall headings and goafs, in the presence of methane drainge in a U-type ventilated longwall. Arch. Min. Sci., Vol. 58, No 3, p.705-718.

Archives of Mining Sciences

The Journal of Committee of Mining of Polish Academy of Sciences

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IMPACT FACTOR 2016: 0.550
5-year IMPACT FACTOR: 0.610

CiteScore 2016: 0.72

SCImago Journal Rank (SJR) 2016: 0.320
Source Normalized Impact per Paper (SNIP) 2016: 0.950

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