Experimental study on the influence of coal oxidation on coal and gas outburst during invasion of magmatic rocks into coal seams

Zhou, Baoxue; Yang, Shengqiang; Wang, Chaojie; Cai, Jiawen; Xu, Qin; Sang, Naiwen

doi:10.1016/j.psep.2019.02.017

Cited by 30 publications

(8 citation statements)

References 32 publications

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“…The indices of the direct forecasting methods often consist of gas pressure ( P), drilling gas inrush initial velocity ( q), drill cutting desorption ( Δh2), drilling cutting weight ( s), Protodyakonov strength index ( f ), initial gas emission rate ( Δp), and comprehensive index ( D and K) (Zhou et al., 2019). According to the provisions of the prevention of coal and gas outbursts (China’s State Administration of Work Safety, 2009), the identification of an outburst-prone coal seam should first be ground on the field gas dynamic phenomenon.…”

Section: Geological Settings and Methodologymentioning

confidence: 99%

Prediction of coal and gas outbursts by a novel model based on multisource information fusion

Yang

Jiang

2020

Energy Exploration & Exploitation

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As one type of geologic disaster, coal and gas outbursts seriously threaten safe production in coal mines, restricting the sustainable development of the mining industry. However, coal and gas outbursts are difficult to forecast due to their uncertainty and the limitation of sample size, which affect the accuracy of the traditional prediction methods to some extent. Therefore, this study developed a novel model based on multisource information fusion to realize the predictive progress of coal and gas outburst disasters. Through the application of Dempster-Shafer theory, a method of multisource information fusion, the proposed model combined the results of different forecasting approaches, including conventional techniques and an emerging method based on artificial intelligence. To enhance the performance of the established model, this study improved Dempster-Shafer theory and verified its effectiveness in dealing with highly conflicting information. We then applied this model to the No. 3 coal seam of the Xinjing coal mine, Shanxi Province, China. The fused prediction accurately reflected the situation of outburst hazards and showed good compensation for false prediction. An analysis of the results concluded that the model based on multisource information fusion increases the credibility of the forecast, which might provide technical support for safe coal mine production.

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Section: Geological Settings and Methodologymentioning

confidence: 99%

Prediction of coal and gas outbursts by a novel model based on multisource information fusion

Yang

Jiang

2020

Energy Exploration & Exploitation

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“…A KKS-5690A gas chromatograph was used to analyze gas from coal by the action of static blasting materials. In the tests, the gas produced from coal samples in the tank was injected through a sampler and carried by hydrogen into a dedicated column [27]. e adsorption force of gas components in the column was different between desorption and adsorption state.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Static Blasting Materials on Coal Structure Changes and Methane Adsorption Characteristics

Cui

Zhang

Guo

et al. 2020

Advances in Materials Science and Engineering

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Methane in coal seam is always under the dynamic process of adsorption and desorption. It has been demonstrated that the static blasting technology is an effective way to extract methane from coal. Although it is of great significance to understand the role of static blasting materials on methane extraction, the change of methane during static blasting is not well understood due to limited research studies. In this paper, we took the reaction pressure and heat from the hydration of the static blasting materials as the main factors. Microstructure changes in the static blasting materials and coal were analyzed by scanning electron microscopy, gas chromatography, infrared spectroscopy, and mercury injection. Changes of methane adsorption and adsorption rate before and after the static blasting were also measured. Our results demonstrated that the static blasting materials entered the microcracks of the coal body and the porosity of the coal was increased by heat expansion, improving methane migration. During the blasting process, methane began to desorb from the coal and its adsorption content was decreased. In contrast, the adsorption of methane was increased after the reaction. However, methane adsorption rate is higher than that of raw coal, indicating that the adsorbed methane is easier to convert into free methane, which is conducive to emission. This is of great significance to methane extraction and the safety of mines.

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“…Griffiths A. [22][23][24] considered the energy change of a body with a crack under loading and obtained an energy crite rion of fracture, according to which a crack acquires the ability to propagate spontaneously only when the rate of release of elastic energy during growth becomes equal to or exceeds the energy of the newly formed surface…”

Section: ( )mentioning

confidence: 99%

Assessment of the influence of the surface layer of coals on gas-dynamic phenomena in the coal seam

Maussymbayeva,

Yurov,

Portnov

et al. 2024

Nauk. visn. nat. hirn. univ.

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Purpose. Development of physical and mathematical model linking nanostructured surface layer of coal substance with geodynamic phenomena of coal seam, through adhesion energy of different layers and coal grades, melting temperature of the nanolayer, determination of the role of stress-strain state of the seam in the formation of fine coal and methane at their emissions into the mine workings. Methodology. Mathematical and experimental studies of the regular change in the surface layer of coal substance depending on the grade of coals for different formations of the Karaganda basin; assessment of the influence of the surface layer of coal on the adhesion energy, which determines the stress-strain state of the coal seam. Physical methods for studying the decomposition temperature of methane-bearing coal seams, changes in its concentration, reaction rate of methane release from coals. Findings. A regular decrease in the thickness of the surface nanolayer of coal substance in different coal grades and formations in the metamorphic series of coals is shown. It has been found that this decrease is accompanied by an increase in surface energy and adhesion energy. The connection of gas-dynamic phenomena with stress-strain state of coal seam, which forms fine-dispersed structure of coal, forms of methane location, activation energy of solid coal-methane solution, rate of thermal decomposition reaction, critical stresses determining development of cracks in coal substance is shown. Originality. For the first time, a physical model for calculating the thickness of the surface nanolayer and its surface energy for coals of different grades of the Karaganda basin has been developed; the relationship between the thickness of the nanolayer and the melting temperature, adhesion energy, linking the stress-strain state of the coal bed in the zone of gas-dynamic phenomena and the concentration of methane has been established. The value of internal stresses in the surface layer of coals of different grades has been found to be a constant value. Connection of activation energy of decomposition of solid coal-methane solution from Gibbs energy and methane concentration, which explains its significant amount in gas-dynamic phenomena, has been established. Practical value. The physical and mathematical model describes the influence of surface coal on the processes occurring in the zone of gas-dynamic phenomena and the regularities of their changes depending on the thickness of the surface nanolayer determining such parameters as: stress-strain state, dispersion of coals, as well as the release of a large amount of methane at the sudden release of coal gas into the mine workings.

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Experimental study on the influence of coal oxidation on coal and gas outburst during invasion of magmatic rocks into coal seams

Cited by 30 publications

References 32 publications

Prediction of coal and gas outbursts by a novel model based on multisource information fusion

Prediction of coal and gas outbursts by a novel model based on multisource information fusion

The Effect of Static Blasting Materials on Coal Structure Changes and Methane Adsorption Characteristics

Assessment of the influence of the surface layer of coals on gas-dynamic phenomena in the coal seam

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