Experiment and Mechanism on Characteristics of Coalbed Methane Adsorption Affected by Water


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In order to investigate on diversities of existing condition of coalbed methane in same stratum and various moisture content states, raw coking and meager coal have been adopted and a series of experimental equipments for fixed volume adsorption have also been designed. Further dealing with analyses of adsorption velocities, capacities or mechanisms, six different moisture contents of 1# coking and 2# meager cylinder block coal samples have been chosen separately to engage in the typical experiments of coalbed methane adsorption. From the adsorptive experiments, the existing condition of coalbed methane in the real stratum has been illustrated. The results showed that: a) at the same initial gas injection pressure, the adsorption velocities are decreased with the increased of moistures. Gas pressure declines are 22 and 16 times of moisture content 0% than the saturation moistures separately. b) The simulation results of coalbed methane adsorption capacities followed by moistures are linear of 1# and nonlinear of 2# separately. c) At the different moistures, time effect characteristics of adsorption capacity is logarithmic and would not be getting to equilibrium state until undergoing 12 hours or even more. Also simulative constant values are disaffinity in different coal degrees. d) By ways of the analyses in basis of experimental results on adsorptive mechanism between gas and water, the adsorbability of coalbed methane affected by water is related to macro fractures distribution on the surface of coal samples.



Advanced Materials Research (Volumes 243-249)

Edited by:

Chaohe Chen, Yong Huang and Guangfan Li






D. Zhao and Z. C. Feng, "Experiment and Mechanism on Characteristics of Coalbed Methane Adsorption Affected by Water", Advanced Materials Research, Vols. 243-249, pp. 4960-4964, 2011

Online since:

May 2011




[1] J.H. LEVY, S.J. DAY, and J.S. KILLINGLEY: Methane capacities of Bowen Basin coals related to coal properties. Fuel Vol. 76(1997), p.813–819.

DOI: 10.1016/s0016-2361(97)00078-1

[2] Y.B. YAO, D.M. LIU, and D.Z. TANG: Fractal characterization of adsorption-pores of coals from North China-an investigation onCH4 adsorption capacity of coals. I J Coal Geology Vol. 73 (2008), p.27–42.

DOI: 10.1016/j.coal.2007.07.003

[3] Z.C. ZHANG and P.L. MA: Experimental on moisture effects on the gas adsorption specialty of different kinds of coal. J China Coal Society Vol. 33(2008), pp.144-147. (In Chinese).

[4] W.P. JIANG, Y.J. CUN, and L.W. ZHONG: Quantum Chemical Study on Coal Surface Interacting with CH4 and H2O. Natural Gas Geo-science Vol. 18(2007), pp.576-583. (In Chinese).

[5] B.S. NIE, X.Q. HE, and E.Y. WANG: Microscopic mechanism of Coal Adsorbing Water. J China University of Mining & Technology Vol. 33(2004), pp.379-383. (In Chinese).

[6] Z.C. FENG, D. ZHAO, and Y.S. ZHAO: Experimental Study on Impact of Water Ratio to Adsorption of Lump Coal. Chinese Journal of Rock Mechanics and Engineering Vol. 28(2009), pp.3291-3295. (In Chinese).

[7] W.P. JIANG, Y.J. CUI, and Q. ZHANG: The Quantum Chemical Study on Different Rank Coals Surface Interacting with Methane. J China Coal Society Vol. 32(2007), pp.292-295. (In Chinese).

[8] G. FU, X.X. CHEN, and Z.P. LEI: Experimental studies on wetting rate of coal body. J China Coal Society Vol. 23(1998), pp.630-633. (In Chinese).

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