Enhancing Safety in the Polish High-Methane Coal Mines: an Overview

Szlązak, N.; Obracaj, D.; Swolkień, Justyna

doi:10.1007/s42461-020-00190-0

Cited by 22 publications

(19 citation statements)

References 41 publications

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“…The average depth Fig. 5 The methane content and coal seam pressure studied in the USCB coal mines (Tarnowski 1971) of coal extraction in 2010 was around 700 m, and from year to year it was permanently increasing by 8-10 m. Now, the average depth of coal production is 788 m and coal sorption capacity is much lower than in shallower seams and the gas pressure in coal seams increases with depth (GIG 1995(GIG -2019Kotas 1995;Krause 2019;Szlązak et al 2020). Studies conducted by Krause (2019), e.g.…”

Section: Coal Miningmentioning

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)

Dreger

Kędzior

2021

Environ Earth Sci

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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. 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 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 intensity of coal extraction determines the temporal variability of methane emissions in the studied mines.

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Section: Coal Miningmentioning

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)

Dreger

Kędzior

2021

Environ Earth Sci

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“…The slowdown of coal production at greater depths, where methane content and gas pressure are higher, causes an increase in CH 4 emissions (Krause & Łukowicz 1999). Greater concentration of coal extraction increases the real methane hazard (Borowski 1969, Cybulski & Myszor 1974, Krause 2019, Szlązak et al 2020. The methane hazard is one of the most widespread natural dangers in Polish and global underground hard coal mining (e.g.…”

Section: Methane Conditions and The Layoutmentioning

confidence: 99%

“…Unfortunately, in many cases these hazards occur, making the coal production very dangerous (e.g. Trenczek 2016, Szlązak et al 2020. Methane occurrence in coal bearing formations is connected with organic substance transformation processes (diagenesis phase) into lignite and further, into hard coal (catagenesis phase).…”

Section: Introductionmentioning

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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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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“…The main component of this gas is CH 4 . CBM is a valuable energy resource; meanwhile, it is a dangerous source for mining (Szlązak et al 2020). CBM extraction is of great significance both in terms of improving the clean utilization of coal and improving mining safety.…”

Section: Introductionmentioning

confidence: 99%

Primary studies on the effect of coal bio-gasification in situ in the Qinshui basin

Xiao

Zhang

et al. 2021

J Petrol Explor Prod Technol

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Coal bio-gasification is one in situ coal gasification technology that utilizes the digestion of organic components in coal by methanogenic bacteria. It is not only an effective technology to enhance the recoverable reserves of coalbed methane, but also an important technical method to promote clean coal utilization. Relevant laboratory researches have confirmed the technical feasibility of anthracite bio-gasification. However, in the complex environment of coal bed, whether in situ gas can be yield with methanogenic bacteria needs to be verified by in situ experiments. In this study, a vertical well and a horizontal well were used in Qinshui basin to perform field experiments to confirm the technical industrial feasibility. The concentration of Cl− ion and number changes of Methanogen spp. were used to trace nutrition diffusion. Gas production changes and coalbed biome evolution were used to analyze technical implementation results. The trace data and biome evolution identified that: (1) The development of Methanoculleus spp. has a significant positive correlation with culture medium diffusion; (2) the structure of coalbed microbial community was significantly changed with the injection of nutrition, and the newly constructed methanogenic community was more suitable for fermentation of coal; and (3) the evolution of dominant microflora has further enhanced bio-gasification of coal. Gas production data showed that the gasification of coal lasted 635 and 799 days and yielded 74,817 m3 and 251,754 m3 coalbed methane in Z-159 and Z-7H wells, respectively. One nutrition injection in coalbed achieved an average of 717 days of continuous gas production in experimental wells. Results confirmed that coalbed methane enhancement with bio-gasification of coal is a potential technology to achieve the productivity improvement of coalbed methane wells. And the findings of this study can help to further understand the mechanism of in situ coal bio-gasification and provide theoretical support for the development of biomining of coal.

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Enhancing Safety in the Polish High-Methane Coal Mines: an Overview

Cited by 22 publications

References 41 publications

Methane emissions against the background of natural and mining conditions in the Budryk and Pniówek mines in 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)

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

Primary studies on the effect of coal bio-gasification in situ in the Qinshui basin

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