On Gas Desorption-Diffusion Regularity of Bituminous Coal with Different Particle Sizes and Its Influence on Outburst-Coal Breaking

Jie Zheng, Qinming Liang, Xin Zhang, Jinyong Huang, Wei Yan, Gun Huang () and Honglin Liu
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Jie Zheng: School of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, China
Qinming Liang: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
Xin Zhang: School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China
Jinyong Huang: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
Wei Yan: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
Gun Huang: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
Honglin Liu: School of Geology and Mining Engineering, Xinjiang University, Urumqi 830046, China

Sustainability, 2023, vol. 15, issue 13, 1-15

Abstract: Coal and gas outburst is an urgent and constantly perplexing problem with coal resource extraction, threatening coal mine safe and sustainable production severely. Its mechanism and the participation of gas in coal breaking are still unclear. To explore this problem, in this paper, gas desorption-diffusion regularity of bituminous coal with different particle sizes and its influence on outburst-coal breaking were investigated through mercury intrusion porosimetry (MIP) tests, isothermal adsorption tests, and desorption-diffusion tests for coal particles with different sizes. The results indicated that the cumulative diffusion amount ( Q t ) and rate ( Q t / Q ∞ ), the effective diffusion coefficient ( D ′ ), and the kinetic diffusion parameter ( υ ) decreased as particle size increased. That meant gas was easier to desorb and diffuse from the smaller coal blocks, consequently making coal break into more tiny particles and accelerating gas desorption. As a result, a positive feedback effect that coal breaks continuously and gas releases rapidly and abundantly was formed in a short time when outbursts started, which caused gas release in quantities and promoted the occurrence of outbursts. The findings of this study enhance our understanding of the mechanism of gas participating in coal fragmentation during outbursts, which are significantly conducive to the prevention and control of coal mine disasters and sustainable production of coal resources.

Keywords: mine disasters control; coal and gas outburst; gas desorption and diffusion; particle size; coal breaking (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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