A surface diffusion transport model considering multilayer adsorption behavior of gas

被引：3
|
作者：
Wang D. [1 ,2 ,3 ,4 ]
Li W. [1 ,3 ]
Pu H. [2 ]
Wei J. [1 ,3 ,4 ]
Yu C. [1 ,3 ]
机构：
[1] State Key Laboratory Cultivation Base for Gas Geology and Gas Control in Henan Polytechnic University, Jiaozuo
[2] State Key Laboratory for GeoMechanics and Deep Underground Engineering in China University of Mining & Technology, Xuzhou
[3] School of Safety Science and Engineering in Henan Polytechnic University, Jiaozuo
[4] Coal Production Safety Collaborative Innovation Center in Henan Province, Jiaozuo
来源：
| 1600年 / University of Petroleum, China卷 / 44期
关键词：
Multilayer adsorption; Nanopore; Pressure effect; Surface diffusion model; Temperature effect;
D O I：
10.3969/j.issn.1673-5005.2020.01.013
中图分类号：
学科分类号：
摘要：
Gas mainly exists as adsorbed phase in nanopores, so the contribution of surface diffusion of adsorbed gas to the total gas flow cannot be ignored. Due to Langmuir monolayer adsorption cannot effectively describe the characteristics of gas adsorption under high temperature and high pressure, a new theoretical formula about surface diffusion coefficient of adsorbed gas was developed on the basis of monolayer adsorption coverage concept. And, its rationality and accuracy were verified by the relevant experimental and theoretical data. Further, a surface diffusion model about multilayer adsorption in pore wall was constructed, and the effects of pressure and temperature on surface diffusion transport were analyzed. The results show that the proposed formula about surface diffusion coefficient is more advantageous compared to the monolayer adsorption, which effectively reflects the multilayer adsorption characteristics of gas molecules. Based on multilayer adsorption theory, the new surface diffusion model that coupling temperature and pressure is more accurate and reliable than the traditional surface diffusion model. Pressure and temperature are two important aspects that affect the transport of surface diffusion. The effect of pressure on surface diffusion flux is significant in the nanopores dominated by surface diffusion transport (the pressure increases 9 MPa, the flux increases two orders of magnitude). The effect of temperature on surface diffusion flux is weak (the average temperature increases by 1 ℃, and the flux decreases by 1.13%). © 2020, Periodical Office of China University of Petroleum. All right reserved.
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页码：115 / 123
页数：8
相关论文
共 46 条
  • [1] Yan F., Lin B., Zhu C., Et al., Experimental investigation on anthracite coal fragmentation by high-voltage electrical pulses in the air condition: effect of breakdown voltage, Fuel, 183, pp. 583-592, (2016)
  • [2] Salmi E.F., Nazem M., Karakus M., The effect of rock mass gradual deterioration on the mechanism of post-mining subsidence over shallow abandoned coal mines, International Journal of Rock Mechanics & Mining Sciences, 91, pp. 59-71, (2017)
  • [3] Ni G., Cheng W., Lin B., Et al., Experimental study on removing water blocking effect (WBE) from two aspects of the pore negative pressure and surfactants, Journal of Natural Gas Science & Engineering, 31, pp. 596-602, (2016)
  • [4] Physical chemistry division commission on colloid and surface chemistry, subcommittee on characterization of porous solids: recommendations for the characterization of porous solids
  • [5] Liu H., Mou J., Cheng Y., Impact of pore structure on gas adsorption and diffusion dynamics for long-flame coal, Journal of Natural Gas Science & Engineering, 22, pp. 203-213, (2015)
  • [6] Ji H., Li Z., Peng Y., Et al., Pore structures and methane sorption characteristics of coal after extraction with tetrahydrofuran, Journal of Natural Gas Science & Engineering, 19, 7, pp. 287-294, (2014)
  • [7] Akkutlu I.Y., Fathi E., Multiscale gas transport in shales with local kerogen heterogeneities, SPE Journal, 17, 4, pp. 1002-1011, (2011)
  • [8] Shindo Y., Hakuta T., Yoshitome H., Et al., Gas diffusion in microporous media in Knudsen's regime, Journal of Chemical Engineering of Japan, 16, 2, pp. 120-126, (2006)
  • [9] Klinkenberg L.J., The permeability of porous media to liquid and gas, API Driling and Production Practices, pp. 200-213, (1941)
  • [10] Ziarani A.S., Aguilera R., Knudsen's permeability correction for tight porous media, Transport in Porous Media, 91, 1, pp. 239-260, (2012)
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