Forecast of methane emission from closed underground coal mines exploited by longwall mining – A case study of Anna coal mine

Duda, Adam; Krzemień, Alicja

doi:10.1016/j.jsm.2018.06.004

Cited by 34 publications

(18 citation statements)

References 7 publications

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“…After coal mine closuring processes, the total methane emission to the goafs lasts approximately 15 years, constantly decreasing and eventually vanishing completely, but the CH 4 emission from the unmined seams can lasts 20 years. (Krause & Pokryszka 2013, Koptoń & Wierzbiński 2014, Duda & Krzemień 2018, Krause 2019.…”

Section: Methane Conditions and The Layoutmentioning

confidence: 99%

“…The methane hazard is one of the most widespread natural dangers in Polish and global underground hard coal mining (e.g. Krause & Smoliński 2013, Lu et al 2017, Molayemat & Mohammad Torab 2017, Duda & Krzemień 2018. Methane is an odourless, colourless, and tasteless gas, lighter than air, it displaces oxygen from the atmospheric air, making it non-breathable.…”

Section: Methane Conditions and The Layoutmentioning

confidence: 99%

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Changes in the methane emissions and hard coal output in the Brzeszcze mine (the Upper Silesian Coal Basin, Poland)

Dreger

2020

geol

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The paper presents the variability of methane emissions in mining excavations in the Brzeszcze mine (Poland) against the background of hard coal output, geological and mining factors. The geological structure of the Upper Silesian Coal Basin (USCB) is very diverse. The Brzeszcze coal deposit is located close to the large and permeable Jawiszowice fault which increases the methane hazard during mining activities performed close to this fault. The overall decrease in hard coal output (1988–2018) has coincided with a rapid increase in methane emissions (1997–2018). Throughout the study period, hard coal output decreased threefold from 3.9 to 1.2 million Mg annually. Coal extraction in high methane content beds (e.g. 510, 405/1, 364, 352) increases the total methane (CH4) emission into mining excavations, aggravating the methane hazard due to the high explosiveness of the gas. To protect miners, coal workings need to be continuously ventilated, taking the harmful gas out of the mine (ventilation air methane emission) or methane needs to be captured by underground methane systems (degassing). Every year, over 34 million m3 of CH4 is captured by the drainage systems and over 70 million m3 CH4 (average) is discharged through ventilation shafts into the atmosphere. The presence of the large, permeable regional dislocation, the Jawiszowice fault zone, shaped the methane concentration in the fault vicinity, when the highest methane emissions during coal mining was studied.

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Section: Methane Conditions and The Layoutmentioning

confidence: 99%

Section: Methane Conditions and The Layoutmentioning

confidence: 99%

Changes in the methane emissions and hard coal output in the Brzeszcze mine (the Upper Silesian Coal Basin, Poland)

Dreger

2020

geol

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“…Investigations carried out in the abandoned Anna mine in Poland have revealed that CH 4 emission can continue for up to 15 years following mine closure. In every year the trend is decreasing and the predictions showed a total of 7.9 million m 3 of methane could be emitted into the mine goafs during the years 2017 -2023 (Duda and Krzemień 2018). In 2018, of the total volume of methane emitted in the USCB amounting to 916 million m 3 , 599 million m 3 was VAM and the remaining 317 million m 3 was methane from the demethanation of excavations.…”

Section: Methane Hazardmentioning

confidence: 99%

“…Reaching deeper coal seams carries a high methane risk, a risk of underground tremors, and intensi cation of temperature hazards. The increase of methane emission is one of the most dangerous problems in modern mining activity and entails work suspension, evacuations and even fatalities after methane explosions (Duda and Krzemień 2018;Dreger and Kędzior 2019). Two mines from the USCB were chosen to identify and study variations in methane emissions.…”

Section: Introductionmentioning

confidence: 99%

Methane Emissions Against the Background of Natural and Mining Conditions in the Budryk and Pniówek Mines in the Upper Silesian Coal Basin (Poland)

Dreger¹,

Kędzior²

2020

Preprint

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The paper presents the variability of hard coal output, methane content and methane emissions into coal workings and into the atmosphere from the two most methane-gassy coal mines in Poland, Budryk and Pniówek, which are both incorporated in the Jastrzębie Coal Company. The Budryk mine is one of the youngest mines in Poland, but it is the most methane-gassy as well. In 2016, the total CH4 emissions exceed 140 million of m3. This large increase in methane emissions to mine workings is primarily related to the increase in the depth of coal extraction (up to 1290 m) and, consequently, the rapid increase in the methane content in coal seams (up to 10-12 m3 / Mg coaldaf). On the other hand, in the Pniówek mine, methane emission was the highest at the beginning of the study period (1986-1991). During the following years emission decreased to the values of less than 140 million of m3, which were still one of the largest amounts of emitted methane in the entire Upper Silesian Coal Basin. The vertical distribution of methane content, different than in the Budryk mine, and the presence of a secondary high methane zone at the Carboniferous top, seem to be decisive for the long-term distribution of methane emissions in the Pniówek mine. The coexistence of natural factors, such as the geological structure and gas distribution, as well as mining-related factors, i.e. the depth of mining, the concentration of coal extraction determines the temporal variability of methane emissions in the studied mines.

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“…Little research is devoted to the issue of predicting methane emissions from Polish mines. The problem of methane emissions in the atmosphere was studied by [27]. Here, the authors focused on the prediction of methane emissions from a closed mine.…”

Section: Introductionmentioning

confidence: 99%

Forecasting Methane Emissions from Hard Coal Mines Including the Methane Drainage Process

Tutak

Brodny

2019

Energies

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With regard to underground mining, methane is a gas that, on the one hand, poses a threat to the exploitation process and, on the other hand, creates an opportunity for economic development. As a result of coal exploitation, large amounts of coal enter the natural environment mainly through ventilation systems. Since methane is a greenhouse gas, its emission has a significant impact on global warming. Nevertheless, methane is also a high-energy gas that can be utilized as a very valuable energy resource. These different properties of methane prompted an analysis of both the current and the future states of methane emissions from coal seams, taking into account the possibilities of its use. For this reason, the following article presents the results of the study of methane emissions from Polish hard coal mines between 1993–2018 and their forecast until 2025. In order to predict methane emissions, research methodology was developed based on artificial neural networks and selected statistical methods. The multi-layer perceptron (MLP) network was used to make a prognostic model. The aim of the study was to develop a method to predict methane emissions and determine trends in terms of the amount of methane that may enter the natural environment in the coming years and the amount that can be used as a result of the methane drainage process. The methodology developed with the use of neural networks, the conducted research, and the findings constitute a new approach in the scope of both analysis and prediction of methane emissions from hard coal mines. The results obtained confirm that this methodology works well in mining practice and can also be successfully used in other industries to forecast greenhouse gas and other substance emissions.

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Forecast of methane emission from closed underground coal mines exploited by longwall mining – A case study of Anna coal mine

Cited by 34 publications

References 7 publications

Changes in the methane emissions and hard coal output in the Brzeszcze mine (the Upper Silesian Coal Basin, Poland)

Changes in the methane emissions and hard coal output in the Brzeszcze mine (the Upper Silesian Coal Basin, Poland)

Methane Emissions Against the Background of Natural and Mining Conditions in the Budryk and Pniówek Mines in the Upper Silesian Coal Basin (Poland)

Forecasting Methane Emissions from Hard Coal Mines Including the Methane Drainage Process

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