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Diffusion of methane through coal.

Authors
Thimons-ED; Kissell-FN
Source
Fuel 1973 Oct; 52(4):274-280
NIOSHTIC No.
10000660
Abstract
Both methane and helium flow through solid coal by Knudsen diffusion, even at relatively high pressures. Knudsen permeabilities were determined for samples of Pittsburgh, Pocahontas No. 3, and Oklahoma Hartshorne coals. The average permeability for dry methane was 1.3 X 10-6 cm2/sec for Pittsburgh coal, 20 x 10-6 for Pocahontas No. 3 Coal, and 13.8 X 10-6 for for Oklahoma Hartshorne coal. A molecular-sieve effect exists for methane in all three coals examined and is very strong in Pittsburgh coal. If the methane is saturated with water vapor, the permeability decreases by a factor of 3 to 25, depending on the coal. The knudsen permeability of solid coal disks seems to bear no relation to coalbed permeability. Lag-time measurements indicate systems of both larger and finer pores and the presence of blind pores. This effect is again more pronounced in the Pittsburgh coal.
Keywords
Mining-industry; Mineral-processing; Mineral-deposits; Coal-processing; Flammable-gases; Methane-drainage; Coal-gas; Coal-mining; Coal-processing
CODEN
FUELAC
CAS No.
74-82-8; 7440-59-7
Publication Date
19731001
Document Type
OP; Journal Article
Fiscal Year
1974
NTIS Accession No.
NTIS Price
Identifying No.
OP 55-74
Issue of Publication
4
ISSN
0016-2361
NIOSH Division
PRC
Source Name
Fuel
State
OK; PA
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