Diffusion of methane through coal.

Kissell, Fred N.; Thimons, Edward D.

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Diffusion of methane through coal.

Public Domain

1973/10/01
By Kissell, Fred N. ; Thimons, Edward D.
Series: Mining Publications

Details

Personal Author:

Kissell, Fred N. ; Thimons, Edward D.
Description:

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. [Description provided by NIOSH]
Subjects:

Coal Coal Mining Minerals Mining Occupational Health Safety
Keywords:

Mining-industry; Mineral-processing; Mineral-deposits; Coal-processing; Flammable-gases; Methane-drainage; Coal-gas; Coal-mining; Coal-processing
Series:

Mining Publications
ISSN:

0016-2361
Document Type:

Text
Genre:

Journal Article
Place as Subject:

Oklahoma ; OSHA Region 3 ; OSHA Region 6 ; Pennsylvania
CIO:

National Institute for Occupational Safety and Health (NIOSH)
Division:

PRC - Pittsburgh Research Center
Topic:

Workplace Safety & Health
Location:

North America
Pages in Document:

274-280
Volume:

52
Issue:

4
NIOSHTIC Number:

nn:10000660
Citation:

Fuel 1973 Oct; 52(4):274-280
CAS Registry Number:

Helium (CAS RN 7440-59-7) ; Methane (CAS RN 74-82-8)
Federal Fiscal Year:

1974
Peer Reviewed:

True
Source Full Name:

Fuel
Collection(s):

National Institute for Occupational Safety and Health
Main Document Checksum:

urn:sha-512:7dc847c09aedf140bc731323e8446b4703641ae07d6ad9e7b7238120dab30b8f7dcaa9b938d34d035f87873a0fe7fec262d5d13dcaf290925445e82b6de3b57d
Download URL:

https://stacks.cdc.gov/view/cdc/246479/cdc_246479_DS1.pdf
File Type:

[PDF - 168.02 KB ]

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