Browsing by Subject "methane hazard"

Now showing 1 - 4 of 4

Access status: Open Access ,
Badania wydzielania metanu do wyrobisk chodnikowych drążonych kombajnami w pokładach węgla
(2006) Szlązak, Nikodem; Borowski, Marek
This article characterizes the sources of methane emission to a heading. Dependencies, on whose basis the stream of methane emitted from extracted coal, surface area of coal walls and face of heading can be calculated, are given. The results of measurements of methane emission to headings with continuous miners of very gassy mines, which were ventilated by means of overlap auxiliary ventilation system (main forcing duct and short exhaust duct with a dust seperator) are presented. On the basis of those results the co-efficient characterizing velocity of methane emission from surface area of coal wall and intensity of emission from exposed surface area of coal was determined. The values of those co-efficients are dependent on average methane content of coal seam (which was determined during underground drivages). The percentage contribution of face zone of heading comprising 50 m from the face in total volumetric methane flow was also determined. On the basis of those measurements it can be concluded that this zone includes 65% of total methane emission into a heading.
Access status: Open Access ,
Devices for measuring ventilation parameters and methane concentration as well as concept of complex monitoring of methane hazard in longwall area
(Wydawnictwa AGH, 2017) Mróz, Jerzy; Felka, Dariusz; Broja, Adam; Małachowski, Marcin
This paper discusses the issue of the methane hazard occurring in the longwall areas of hard coal deep mines along with ways of overcoming this hazard. The authors describe devices for measuring the parameters of the underground environment in the exploitation area. Then, they present the results of tests to determine the methane hazard level in the longwall area. The parameters of ventilation-, absolute-, and criteria-methane-bearing capacity are determined based on online measurements of ventilation and gas parameters. The presented results are the effects of the European project AVENTO (Advanced tools for monitoring ventilation and methane emission).
Access status: Open Access ,
Methane emissions in selected hard-coal mines of the Upper Silesian Coal Basin in 1997–2016
(Wydawnictwa AGH, 2019) Dreger, Marcin
Hard coal is extracted in the Upper Silesian Coal Basin (USCB) from deeper and deeper coal seams every year. In 2000, the average depth of coal extraction was 600 m, in 2010 – 700 m, but in the last two years (2016–2017) this has been extended to a depth of 770 m. The USCB is not homogeneous in layout in terms of methane hazard, but rather very diverse. Therefore, the USCB has been divided into seven gassy regions to show differences in methane danger distribution. Northern and central USCB regions (I, II and III) are the mostly naturally degassed, so the most dangerous gassy conditions are in the IV and V regions, where methane content in coal seams varies from 6 m$^{3}$/Mg coaldafto above 18 m$^{3}$/Mg coal$^{daf}$. The two westernmost USCB gassy regions (VI and VII) are poorer in methane than the IV and V areas. Six representative coal mines were chosen: Mysłowice-Wesoła, Budryk, Brzeszcze, Pniówek, Marcel and Rydułtowy-Anna based on their high hard coal production and total methane emissions. The reason for the highest methane emission in those regions might be fault tectonics facilitating methane migration and also the thick and continuous Miocene cover constituting a hermetic screen for gases in the southern part of the USCB.
Access status: Open Access ,
Projektowanie parametrów wentylacji lutniowej w drążonych wyrobiskach podziemnych z wykorzystaniem programu komputerowego AGHWEN-3.0
(Wydawnictwa AGH, 2005) Szlązak, Nikodem; Obracaj, Dariusz; Szlązak, Łukasz
The principles of designing duct ventilation system and calculation of air distribution along underground headings fitted with leaky ductlines using AGHWEN-3.0 computer programme are presented in the paper. The algorithm of the calculation takes into consideration methane emission into a heading and both the air temperature and humidity distribution along a heading. It takes into consideration the cooperation between ventilation system, dust collection system and air cooling system. On the basis of a few examples the possibilities of AGHWEN-3.0 used in designing a ventilation system are presented.