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

Wierzbicki, M.; Skoczylas, Norbert

doi:10.2478/amsc-2014-0070

Cited by 18 publications

(15 citation statements)

References 7 publications

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“…Studies on the processes associated with the occurrence and development of coal gas disasters indicate that coal and gas outbursts are accompanied by the rapid desorption of coal gas, where large amounts of gas desorbs from the coal mass in an extremely short time Wierzbicki and Skoczylas, 2014;Xue et al, 2014). Thus, gas desorption experiments were performed according to the following steps: First, the coal samples were manipulated to achieve adsorption equilibrium at 1 MPa; second, the free gas in the coal sample tank was rapidly released and the desorption data after relief of the gas pressure were recorded.…”

Section: Desorption Experimentsmentioning

confidence: 99%

“…The fundamental mechanisms causing coal and gas outbursts remain a mystery due to numerous contributing factors (Fisne and Esen, 2014;Shepherd et al, 1981;Singh, 1984;Wang et al, 2014c;Wierzbicki and Skoczylas, 2014). Many attempts have been made to explain the outburst process, and various hypotheses and theoretical models have been proposed (Barron and Kullmann, 1990;Hodot, 1966;Lunarzewski, 1998;.…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Pulverization characteristics of coal from a strong outburst-prone coal seam and their impact on gas desorption and diffusion properties

Guo

Wang

Ren

et al. 2016

Journal of Natural Gas Science and Engineering

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Section: Desorption Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Pulverization characteristics of coal from a strong outburst-prone coal seam and their impact on gas desorption and diffusion properties

Guo

Wang

Ren

et al. 2016

Journal of Natural Gas Science and Engineering

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“…At present, China is the country with the highest risk of coal and gas outburst accidents in the world [1,2]. The mechanism of coal and gas outbursts has not been unified, but most scholars believe that coal and gas outbursts are the result of the combined effects of three major factors: ground stress, gas and the physical and mechanical properties of coal [3][4][5][6][7][8]. An unfavorable combination of these factors with mining methods can be a recipe for disaster if not recognized at an early stage of mine development [6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Sizes on the Physical and Mechanical Properties of Briquettes

Pang

Yang

et al. 2019

Energies

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The particle size of coal particles is an important factor affecting the physical and mechanical properties of coal. In this study, uniaxial and triaxial compression tests were conducted to investigate the effects of coal particle size on the physical and mechanical properties of briquettes and their impact mechanism using a rock mechanics test-150B servo system (RMT-150B). The results showed that the uniaxial compression strength, elastic modulus and deformation modulus of briquettes increase when particle size is decreased. The deformation characteristics of the briquettes directly prepared by raw tectonic coal were similar to those of coal specimens with a particle size of 0.18–0.25 mm. The cohesion and strength of coal specimens increased when particle size was decreased, and the plastic deformation capacity decreased when particle size was decreased, showing a strong correlation. The f briquette directly prepared by the raw tectonic coal had a strength between that of coal specimens with a particle size of 2–6 mm and those with a particle size of 0.18–0.25 mm. The mechanical properties of briquettes mainly depend on the meshing force between the coal particles. The smaller the particles, the greater the mechanical meshing force. The “floating particles”, generated in the voids between coal particles during the preparation process, are a significant factor affecting the plasticity characteristics. The research results may be used as a basic reference in the study of the mechanical properties of tectonic coal, gas migration and coal and gas outburst mechanisms.

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“…During comminution, 'new surfaces' appear, from which the gas is released in a non-filtration manner. Crushing of coal can occur during mining operations [6], sudden rock bursts or outbursts [7,8]. In recent years, the hazards of ejection phenomena occur not only in coal mines, but also in copper ore mines [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of the kinetics of sorption and gas filtration in coal

Gawor

2018

Studia Geotechnica Et Mechanica

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The paper presents tests set-ups for experiments on sorption kinetics and gas filtration kinetics in a porous medium. It was observed that two phenomena occur in these processes: transportation of gas into the porous solid and settling of gas molecules on the walls of the solid or within its volume. An experiment was carried out in which a thin resistance thermometer was quickly taken out of an argon stream and placed in carbon dioxide or the other way round. The measurement made it possible to determine the sorption time constant. It was demonstrated that the sorption rate is much higher than the filtration rate. Thus, filtration is the process describing the rate at which gas molecules penetrating the porous substance are adsorbed or desorbed. The sorption time constant is not >50 m.In the second experiment, the author determined the rate at which gas is liberated from coal grains. The measurement method was based on measurement of the pressure of desorbing gas in constant volume. The experiment involved measurement of the pressure of the gas liberated from the coal grains in a closed chamber. The kinetic curves obtained in this way were used to determine the carbon dioxide coefficient in coal grains. During the experiment, particular focus was put on the initial stage of gas liberation (up to 0.4 s).The slower process of gas transporting in the porous structure of coal is the transporting of gas through a coal briquette. Experimentally implemented variety of boundary conditions allowed for a more complete verification of the assumed theoretical model and possibly for the exact determination of filtration parameters. The experimental set-up built for this purpose, allows for pressure and temperature measurement on the briquette side surface.

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

Cited by 18 publications

References 7 publications

Pulverization characteristics of coal from a strong outburst-prone coal seam and their impact on gas desorption and diffusion properties

Pulverization characteristics of coal from a strong outburst-prone coal seam and their impact on gas desorption and diffusion properties

Effect of Particle Sizes on the Physical and Mechanical Properties of Briquettes

Experimental determination of the kinetics of sorption and gas filtration in coal

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