Please wait a minute...

Frontiers of Chemical Science and Engineering

Front Chem Sci Eng    2012, Vol. 6 Issue (1) : 94-103     DOI: 10.1007/s11705-011-1172-2
RESEARCH ARTICLE |
Modeling of coal swelling induced by water vapor adsorption
Zhejun PAN()
CSIRO Earth Science and Resource Engineering, Clayton 3168, Australia
Download: PDF(342 KB)   HTML
Export: BibTeX | EndNote | Reference Manager | ProCite | RefWorks
Abstract

Gas adsorption-induced coal swelling is a well-know phenomenon. Coal swelling or shrinkage by adsorption or desorption of water vapor has not been well understood but has significant implications on gas drainage process for underground coal mining and for primary and enhanced coalbed methane production. Decreased matrix moisture content leads to coal shrinkage and thus the change of cleat porosity and permeability under reservoir conditions. Unlike gas adsorption in coal which usually forms a single layer of adsorbed molecules, water vapor adsorption in the coal micropores forms multilayer of adsorbed molecules. In this work, a model has been developed to describe the coal swelling strain with respect to the amount of moisture intake by the coal matrix. The model extended an energy balance approach for gas adsorption-induced coal swelling to water vapor adsorption-induced coal swelling, assuming that only the first layer of adsorbed molecules of the multilayer adsorption changes the surface energy, which thus causes coal to swell. The model is applied to describe the experimental swelling strain data measured on an Australian coal. The results show good agreement between the model and the experimental data.

Keywords multilayer adsorption      vapour pressure      coal shrinkage      relative humidity      permeability     
Corresponding Authors: PAN Zhejun,Email:Zhejun.Pan@csiro.au   
Issue Date: 05 March 2012
 Cite this article:   
Zhejun PAN. Modeling of coal swelling induced by water vapor adsorption[J]. Front Chem Sci Eng, 2012, 6(1): 94-103.
 URL:  
http://journal.hep.com.cn/fcse/EN/10.1007/s11705-011-1172-2
http://journal.hep.com.cn/fcse/EN/Y2012/V6/I1/94
Service
E-mail this article
E-mail Alert
RSS
Articles by authors
Zhejun PAN
1 Moffat D H, Weale K E. Sorption by coal of methane at high pressures. Fuel , 1955, 34: 449-462
2 Levine J R. Model study of the influence of matrix shrinkage on absolute permeability of coal bed reservoirs. In: Gayer R, Harris I, eds. Coalbed Methane and Coal Geology. Geological Society Special Publication , 1996, 109:197-212
3 St. George J D, Barakat M A. The change in effective stress associated with shrinkage from gas desorption in coal. International Journal of Coal Geology , 1996, 35: 83-115
4 Day S, Fry R, Sakurovs R. Swelling of Australian coals in supercritical CO2. International Journal of Coal Geology , 2008, 74(1): 41-52
5 van Bergen F, Spiers C, Floor G, Bots P. Strain development in unconfined coals exposed to CO2, CH4 and Ar: effect of moisture. International Journal of Coal Geology , 2009, 77(1-2): 43-53
6 Majewska Z, Ceglarska-Stefanska G, Majewski S, Zietek J. Binary gas sorption/desorption experiments on a bituminous coal: Simultaneous measurements on sorption kinetics, volumetric strain and acoustic emission. International Journal of Coal Geology , 2009, 77(1-2): 90-102
7 Palmer I, Mansoori J. How permeability depends on stress and pore pressure in coalbeds: a new model. SPE Reservoir Evaluation & Engineering , 1998, 1(6): 539-544
8 Shi J Q, Durucan S. Drawdown induced changes in permeability of coalbeds: a new interpretation of the reservoir response to primary recovery. Transport in Porous Media , 2004, 56(1): 1-16
9 Shi J Q, Durucan S. A model for changes in coalbed permeability during primary and enhanced methane recovery. SPE Reservoir Evaluation & Engineering , 2005, 8(4): 291-299
10 Martin C H ed. Australasian Coal Mining Practice. Victoria: The Australasian institute of mining and metallurgy, 1996, 342
11 Cossarutto L, Zimny T, Kaczmarczyk J, Siemieniewska T, Bimer J, Weber J V. Transport and sorption of water vapour in activated carbons. Carbon , 2001, 39(15): 2339-2346
12 Do D D, Do H D. A model for water adsorption in activated carbon. Carbon , 2000, 38(5): 767-773
13 Nishino J. Adsorption of water vapor and carbon dioxide at carboxylic function groups on the surface of coal. Fuel , 2001, 80(5): 757-764
14 Day S, Sakurovs R, Weir S. Supercritical gas sorption on moist coals. International Journal of Coal Geology , 2008, 74(3-4): 203-214
15 Pan Z, Connell L D. A theoretical model for gas adsorption-induced coal swelling. International Journal of Coal Geology , 2007, 69(4): 243-252
16 Scherer G W. Dilation of porous glass. Journal of the American Ceramic Society , 1986, 69(6): 473-480
17 Myers A L. Thermodynamics of adsorption in porous materials, 2002, 48(1): 145-160
18 Larsen W J. The effects of dissolved CO2 on coal structure and properties. International Journal of Coal Geology , 2004, 57(1): 63-70
19 Goodman R E. Introduction to Rock Mechanics. New York: John Wiley & Sons, 1980, 173
20 Brunauer S, Emmett P H, Teller E. Adsorption of gases in multimolecular layers. Journal of the American Chemical Society , 1938, 60(2): 309-319
21 Pan Z, Connell L D, Camilleri M, Connelly L. Effects of matrix moisture on gas diffusion and flow in coal. Fuel , 2010, 89(11): 3207-3217
22 Collins K E, Dimiras A B, de Camargo V R, Collins C H. Use of kinetic H2O-adsorption isotherms for the determination of specific surface areas of fully hydroxylated mesoporous silicas. Microporous and Mesoporous Materials , 2006, 89(1-3): 246-250
23 Xu Y, Koga Y, Watkinson P. Pore size distribution of coals and chars form western Canada. Fuel , 1994, 73(11): 1797-1801
24 Radlinski A P, Mastalerz M, Hinde A L, Hainbuchner M, Rauch H, Baron M, Lin J S, Fan L, Thiyagarajan P. Application of SAXS and SANS in evaluation of porosity, pore size distribution and surface area of coal. International Journal of Coal Geology , 2004, 59(3-4): 245-271
25 Bentz D P, Garboczi E J, Quenard D A. Modelling drying shrinkage in reconstructed porous materials: application to porous Vycor glass. Modelling and Simulation in Materials Science and Engineering , 1998, 6(3): 211-236
Related articles from Frontiers Journals
[1] Xiaobin JIANG, Baohong HOU, Yongli WANG, Jingkang WANG. Permeability analysis and seepage process study on crystal layer in melt crystallization with fractal and porous media theory[J]. Front Chem Sci Eng, 2011, 5(4): 435-441.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed