Microscopic Mechanism of Adsorption–Desorption in Coal and Gas Outburst Process

Lu, Wei; Wang, Ji Ren; Ju, Yi Wen

doi:10.1166/jnn.2017.14460

Cited by 6 publications

(1 citation statement)

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“…Changes in physical states such as the in-situ stress conditions at the location of the coal seam, the adsorption and desorption properties of the gas, and the failure characteristics of the coal will inevitably cause the internal pores and cracks of the coal to change [27,28]. The study of the struc-ture of microscopic pores and cracks in coal and the state of internal gas concentration is essential to grasp and understand the whole process of outburst from initiation to termination.The pore structure of coal with different degrees of metamorphism or types of coal is often studied by low-temperature liquid nitrogen adsorption method [29][30][31], while the adsorption and desorption properties of coal are obtained by gas adsorption method [32,33], and it can be seen from the results of the existing research, the pore structure and adsorption properties of coal samples after the action of different conditions are changed to a different extent [34][35][36][37].This suggests that the pore structure of coal, as well as the storage state and migration mode of the gas within it, have an impact on the properties of coal, especially the potential effect on the outburst process, which cannot be ignored.…”

Section: Introductionmentioning

confidence: 99%

Study on pore structure and adsorption properties of coal and microscopic action mechanism of outburst

Zou,

Wang,

Zhang

et al. 2024

Preprint

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Coal and gas outburst is a complex dynamic phenomenon happened in the underground of coal mines, and it has been a serious threat to the safe and efficient production of mines. To investigate the complex mechanism of action in depth, based on the prototype of coal and gas outburst induced by coal uncovering, a large-scale coal and gas outburst test was carried out, and coal samples were obtained through isometric excavation, grinding, and sieving, and the pore structure and gas adsorption properties of coal samples were analyzed, and the mechanism of the disaster caused by the deterioration of the coal through the combined effect of the in-situ stress and gas pressure was investigated at a microscopic level with the theory of fracture mechanics. The research results aim to enrich the basic theory of coal and gas outburst and provide technical references for outburst prevention work.

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Section: Introductionmentioning

confidence: 99%

Study on pore structure and adsorption properties of coal and microscopic action mechanism of outburst

Zou,

Wang,

Zhang

et al. 2024

Preprint

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Experimental investigations of stress‐gas pressure evolution rules of coal and gas outburst: A case study in Dingji coal mine, China

Zhao

Cao

Sun

et al. 2019

Energy Science & Engineering

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Coal and gas outburst is a potentially fatal risk during the mining of gassy coal seams, which seriously threatens the safe mining of collieries. To understand the outburst mechanism and evolution rules, a new apparatus (LSTT) was developed to conduct simulated experiment. In the context of an outburst accident in Dingji coal mine, the authors launched an authentic outburst experiment to replay the outburst accident. Experimental apparatus, similar criterion, coal‐like materials and gas sources, and experimental design were discussed systematically in this paper. Experimentally, the study analyzed the geo‐stress has significant influence on the outburst evolution. At the driving face, the stress concentration possibly caused gas outburst, under the influence of mining‐induced stress. After the outburst occurred, the stress balance of the coal changed, resulting in the instability of the coal. Furthermore, the elastic energy, gas enthalpy, and gravitational potential energy were released rapidly. The experimental result stated that outburst coal has the sorting characteristics, in line with the field outburst law. The intensity prediction model has been built based on the energy model. Moreover, the factors that impact outburst intensity were analyzed. In the process of coal and gas outburst, the gas enthalpy of gas and the elastic potential of coal are the main energy sources. This study provides guidance for the development of the outburst mechanism and outburst mine management.

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Investigation on micro-surface adhesion of coals and implications for gas occurrence and coal and gas outburst mechanism

Tian¹,

Song²,

He³

et al. 2021

Journal of Natural Gas Science and Engineering

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Microscopic Mechanism of Adsorption–Desorption in Coal and Gas Outburst Process

Cited by 6 publications

References 0 publications

Study on pore structure and adsorption properties of coal and microscopic action mechanism of outburst

Study on pore structure and adsorption properties of coal and microscopic action mechanism of outburst

Experimental investigations of stress‐gas pressure evolution rules of coal and gas outburst: A case study in Dingji coal mine, China

Investigation on micro-surface adhesion of coals and implications for gas occurrence and coal and gas outburst mechanism

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