Oxygen control mechanism in non-ventilation excavation based on the simultaneous mining of coal and gas

Fu, Mingming; Zheng, Qiang; He, Shan; Yiran, Yan; Wang, Xiaohui

doi:10.1016/j.psep.2018.12.001

Cited by 5 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High-purity methane can be extracted from the gas zone of enrichment. 3,4 The geological environment of the coal seam makes the pore structure, gas adsorption capacity, and other physical properties of coal significantly different. 5−7 The study shows that as the metamorphism degree of coal increases, the pore volume and pore-specific surface area show a "U-shaped" change trend of decreasing first and then increasing.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Study on the Properties of Gas Diffusion in Various Rank Coals under Positive Pressure

et al. 2023

View full text Add to dashboard Cite

A kind of closed mining and nonventilation working face is proposed, which provides a possibility for eliminating coal mine accidents and extracting high-purity gas. During mining, a confined space above normal pressure is formed in the face. Geological conditions cause significant differences in the physicochemical properties of coal and affect the occurrence and migration of gas in coal seams. The pore structures of five coal samples were obtained by mercury injection and low-temperature nitrogen adsorption. The self-made positive pressure desorption experimental device was used to conduct isothermal desorption experiments under different environmental pressures. An extended Langmuir model was proposed to carry out regression analysis on the curve of positive pressure desorption with time. The effect of coal pore structure on gas diffusion properties was discussed. The results indicate that the development degree of micropores in coal determines the amount of gas adsorption. With the increase of coal rank, both the ultimate desorption quantity and desorption rate first decrease and then increase. The positive pressure enhances the concentration of methane outside the coal and inhibits methane diffusion. With an increase of positive pressure, the desorption capacity of the high-rank ZG was significantly inhibited, and the desorption limit and initial desorption rate decreased by 15.80–44.54 and 16.92–47.93%, respectively. The diffusion coefficient of the middle-rank XS has the greatest decrease rate of 1.56–18.05%. The pore structure of coal is the essential reason that affects methane diffusion.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Without oxygen supply, gas explosion, spontaneous fire, and dust explosion accidents will be eliminated as much as possible. High-purity methane can be extracted from the gas zone of enrichment. , …”

Section: Introductionmentioning

confidence: 99%