Effects of particle size and adsorption pressure on methane gas desorption and diffusion in coal

被引:17
|
作者
Li, Xiangchun [1 ,2 ]
Li, Zhongbei [1 ]
Ren, Ting [3 ]
Nie, Baisheng [1 ]
Xie, Lei [1 ]
Huang, Tao [1 ]
Bai, Sheng [1 ]
Jiang, Ying [1 ]
机构
[1] China Univ Min & Technol Beijing, Sch Emergency Management & Safety Engn, Beijing 100083, Peoples R China
[2] Henan Polytech Univ, State Key Lab Cultivat Base Gas Geol & Gas Contro, Jiaozuo 454000, Henan, Peoples R China
[3] Univ Wollongong, Sch Civil Min & Environm Engn, Wollongong, NSW 2522, Australia
基金
北京市自然科学基金;
关键词
Gas desorption and diffusion; Mathematical model; Coal particle size; Adsorption equilibrium pressure; Diffusion coefficient; Three phases of gas diffusion; PORE STRUCTURE; CO2; DIFFUSION; FLOW; POROSITY; SURFACE; IMPACT; CH4;
D O I
10.1007/s12517-019-4995-7
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
A self-developed gas desorption and diffusion experimental system was used to conduct isothermal methane gas desorption and diffusion experiments, and the pore structure of coal samples was analyzed. A new mathematical model for gas diffusion in coal particles was established, and the diffusion coefficient was calculated using the new model. The influences of particle size and the adsorption equilibrium pressure on the methane gas diffusion rate, gas diffusion quantity, and diffusion coefficient were analyzed and discussed. The results show that under different adsorption equilibrium pressures and different particle sizes, the diffusion rate and quantity vary substantially. The larger the particle size, the slower the initial gas diffusion rate and the longer the time required to reach desorption equilibrium. The larger the adsorption pressure, the greater the initial gas diffusion rate and the larger the quantity of diffusion gas accumulated. However, the coal particle size has little influence on the amount of gas diffusion. It was found that as the particle size decreases, the diffusion coefficient in the first diffusion phase is significantly reduced, which decays with a negative exponential function over time. However, the adsorption equilibrium pressure has no obvious influence on the diffusion coefficient. In addition, the methane gas diffusion process was divided into three phases, namely, phase I, rapid diffusion phase (0-10 min); phase II, slow diffusion phase (10-100 min); and phase III, smooth diffusion phase (100 min); and the diffusion mechanism corresponding to each phase was analyzed. These research results provide a theoretical and practical reference value for gas prevention and control in coal mines.
引用
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页数:17
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