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Mechanism of gas flow through coal

โœ Scribed by F.S. Karn; R.A. Friedel; A.G. Sharkey Jr

Book ID
103090928
Publisher
Elsevier Science
Year
1975
Tongue
English
Weight
465 KB
Volume
54
Category
Article
ISSN
0016-2361

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โœฆ Synopsis

Coals are fossilized plant material plus inorganic silt deposited in irregular layers and containing l-20% void space which provides a medium which is porous to gas flow. Gas flows have been measured using discs of coal cut from several coal seams. Observed flow phenomena include molecular diffusion (low gas pressure, small pores) and bulk diffusion (higher gas pressure, larger pores). In the examples investigated, methane flows ranged from 1.2 X lo-lo cm* s-l atm-l for Pittsburgh-seam attrital coal to 2.0 cm* s-l atm-' for Oklahoma Hartshorne coal. Flow characteristics have been compared with gas flows observed by Knudsen through glass capillaries. This information can be applied to mine safety and to coal utilization studies.

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Measurements were made for helium and methane flowing through thin discs of coal. Flow increased with pressure differential and temperature. At room temperature the flows along the bedding plane were: helium, 873 :< lO-'O cm2 s-l atm-l, and methane 1.2 x 10mro cm2 s-l atm-l. Flow rates were 50"/, lo