Experimental Study on Coal Pore Characteristic Based on Cryogenic Liquid Nitrogen Method

Abstract:

In view of pore distribution in coal, this paper applies BJH method that is based on the cylinder theory and adopts cryogenic liquid nitrogen adsorption method to carry out experimental investigation on pore structure of No.3U coal seam in Sanhekou Coalmine, obtaining the fact that pore structure of No.3U coal is complicated, the cool pores are mostly flask pores, others are the parallel plate pores with one end closed and the cylinder pores with one end closed; According to the distribution of BJH pore volume and pore surface area, ultramicropores with apertures less than 10 nm are among the most; Then obtain the average BET specific surface area, the distribution of BJH pore volume and pore area, average single-point total pore volume and most probable pore .etc, which conducive to a better understanding of the micropores characteristic of coal.

• Periodical: Applied Mechanics and Materials (Volumes 341-342)
• Pages: 345-350
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.341-342.345
• Online since: July 2013
• Authors: Wei Min Cheng, Xiao Qiang Zhang, Rui Zhang, Gang Wang
• Keywords: BJH Method, Cryogenic Liquid Nitrogen Adsorption, Isotherm of Adsorption-Desorption, Micropores in Coal

References

[1] P. Chen and X.Y. Tang: Journal of China Coal Society, Vol. 26(5)(2001), p.552.

[2] Gan H and Nandi S P, Walkeer P L: Fuel, Vol. 51(2)(1972), p.272.

[3] Close J C. Natural fracture in coal, In: Hydrocarbons from coal. Law B E, and Rice D D, eds. AAPG, Studies in Geology, (1993), p.119.

[4] X.H. Fu and Y. Qin: Prediction Theory and Method of Multiphase Medium Coal-Bed Gas Reservoir Permeability, (China University of Mining and Technology Press, Xuzhou 2003).

[5] Q. Hao: Journal of China Coal Society, Vol. 12(4)(1987), p.51.

[6] J.M. Yan, Q.Y. Zhang and J.Z. Gao: Adsorption and Condensation, (Science Press, Beijing 1986).

[7] J H debtor. The shape of capillaries. In: Everett D H, Stone F S, ed. The structure and properties of porous materials, (Butterworth, London 1958).

[8] X. M Meng: Study on the pore structure of coals and characteristics of gases adsorption on coal, Shandong University of Science and Technology, Qingdao (2007).

[9] E. P. Barrett, L.G. Joyner and P.P. Halenda: Journal of American Chemistry Society, Vol. 73(1951), p.373.

[10] S.S. Wu: Applied Physical Chemistry, (Higher Education Press, Beijing 1993).

[11] Hiemenz P C: Colloid and Surface Chemistry Principle, translate by Z. K Zhou, J. M MA, (Peking University Press, Beijing 1986).