Changes in the sorption/diffusion kinetics of a coal-methane system caused by different temperatures and pressures

Wierzbicki, M.

doi:10.2478/gospo-2013-0042

Cited by 17 publications

(13 citation statements)

References 17 publications

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“…Thus, the value of the dP index will depend -among other things -on the kinetic properties of coal in relation to methane (these can be described by means of the D e effective diffusion coefficient (Crank, 1975;Wierzbicki, 2011Wierzbicki, , 2013aWierzbicki, , 2013b), as well as on the initial content of methane in the sample, which, in the case of in situ research, is the methane capacity of the coal seam. In these mining facilities where the undergound mining works are carried out in hazardous areas, the values of methane and rock outburst risk indices (the dP index included) are measured every day.…”

Section: The Correlation Between the Desorption Intensity Index And Tmentioning

confidence: 99%

The Outburst Risk as a Function of the Methane Capacity and Firmness of a Coal Seam

Wierzbicki

Skoczylas

2014

Archives of Mining Sciences

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In most coal basins that are currently being exploited, gas and rock outbursts pose a considerable safety threat. The risk of their occurrence is frequently assessed by means of a parameter known as the methane capacity of coal. In a lot of countries, the evaluation of the mechanical properties of coal is conducted by means of another parameter: the firmness of coal. Due to the laboratory investigations and in situ observations carried out by the authors of this paper, it was possible to determine a function space in which the outburst risk can be described as a function of the methane capacity and firmness of a coal seam. This, in turn, made it possible to link the "gas factor" to the "mechanical factor", and thus provide a more comprehensive risk analysis.

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Section: The Correlation Between the Desorption Intensity Index And Tmentioning

confidence: 99%

The Outburst Risk as a Function of the Methane Capacity and Firmness of a Coal Seam

Wierzbicki

Skoczylas

2014

Archives of Mining Sciences

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“…In particular, these can be: the total sorption capacity under the coal seam methane pressure, the sorption capacity under the methane pressure of 1 bar, and the desorbable content of methane in coal (Wierzbicki M. [12]). These parameters are best interpreted in relation to the methane-bearing capacity, as this makes it easier to estimate the extent to which a given seam is prone to gasogeodynamic phenomena (Skoczylas N. [9]).…”

Section: Introductionmentioning

confidence: 99%

New Instruments and Methods for Analysing the Coal-Methane System

Skoczylas

Kudasik

Wierzbicki

et al. 2015

Studia Geotechnica Et Mechanica

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The authors of the present paper designed and constructed a prototype of an instrument which enables fully automated determination of the desorbable methane content and effective diffusion coefficient in underground conditions. Due to microprocessor analysis of the recorded data and the application of the mathematical model of the diffusion process, it is possible to automatically determine the amount of methane whose release from a coal sample occurred before the sample was placed within a measuring instrument. It is also possible to carry out follow-up extrapolation of the recorded data so the time duration needed to determine reliable results can be reduced. The instrument was tested and optimized, and a number of copies sufficient for performing underground tests were constructed. The concept of the instrument represents a totally new approach to the observation of gas release from a coal sample. Instead of short-period measurements, virtually the whole process of methane release from coal is registered and analysed. This is possibly due to the use of a grain fraction lower than one mm which is presently applied for the sake of evaluating the methane-bearing capacity and desorption intensity.

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“…The sorption capacity of coal depends, among other things, on the temperature of the coalgas system, the coal rank, the maceral composition of coal, and coal humidity. Relevant information on these parameters can be found in numerous publications (Wierzbicki, 2013;2013a;Baran et al, 2016;Skoczylas, 2016;Wang et al, 2015;Weishauptová et al, 2015;, Czerw et al, 2017;Kudasik et al, 2017). The sorption capacity of coal is also influenced by the applied stress.…”

Section: Introductionmentioning

confidence: 99%

An Impact of Mechanical Stress in Coal Briquettes on Sorption of Carbon Dioxide

Wierzbicki¹

2017

Archives of Mining Sciences

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The presence of gases (methane or carbon dioxide) in hard coal is connected with numerous threats for miners employed in underground mining facilities. When analyzing the coal-methane system, it is necessary to determine the relationship between pressure and gas sorption. Such a relationship should be determined under conditions similar to the natural ones – when it comes to both temperature and pressure. The present paper discusses the results of research conducted with the use of coal briquettes under the state of mechanical stress. Carbon dioxide sorption isotherms were determined for different values of stress affecting the coal material. For five coal samples collected in different mines of the Upper Silesian Coal Basin, Langmuir’s sorption isotherms were determined. The results point to significant impact that mechanical stress has upon the sorption process. It is about 1 percent of the value obtained for coal not subjected to stress per 1 MPa. The research results can also prove useful when analyzing hard coal seams from the perspective of their carbon dioxide sequestration abilities.

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Changes in the sorption/diffusion kinetics of a coal-methane system caused by different temperatures and pressures

Cited by 17 publications

References 17 publications

The Outburst Risk as a Function of the Methane Capacity and Firmness of a Coal Seam

The Outburst Risk as a Function of the Methane Capacity and Firmness of a Coal Seam

New Instruments and Methods for Analysing the Coal-Methane System

An Impact of Mechanical Stress in Coal Briquettes on Sorption of Carbon Dioxide

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