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A Statistical Analysis of Methane Concentration Fluctuations Produced by Incomplete Mixing of Methane and Air At a Model Coal Mine Working Face.

Authors
Bielicki-RJ; Kissell-FN
Source
MISSING :21 pages
Link
NIOSHTIC No.
10000577
Abstract
Poor mixing of methane and air at coal mine working faces causes fluctuating methane concentrations. If these fluctuations are large enough, methane levels can periodically exceed safe limits, even though the time average methane concentration may be satisfactory. Concentration fluctuations measured underground can result both from variations in methane emission rate and poor mixing. The present paper reports on a statistical analysis of fluctuations at a constant methane emission rate, that is, on fluctuations due only to poor mixing. A full-scale model of a working face was used. Both peak heights and elapsed times between peaks were evaluated. Good mixing was indicated by normal, poisson, and exponential distributions, and poor or incomplete mixing was indicated by log- normal or gamma distributions.
Publication Date
19740101
Document Type
IH; Report of Investigations
Fiscal Year
1974
NTIS Accession No.
NTIS Price
Identifying No.
RI 7987
NIOSH Division
PRC;
Source Name
MISSING
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