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

Details

• Personal Author:
  Bielicki, Richard J. ; Kissell, Fred N.
• Description:
  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. [Description provided by NIOSH]
• Subjects:
  Occupational Health Safety
• Series:
  Mining Publications
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Conference Publications ; Case Report
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PRC - Pittsburgh Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-21
• NIOSHTIC Number:
  nn:10000577
• Federal Fiscal Year:
  1974
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:1ec5c1952629e0bd8c3504ea7b5e4192f523c3fa313e71f3cf1c742eb3a84c545193ad0db61fd585fc4079b7be4e1435c15efa85a1d295683552aaafd51b23c1
• Download URL:
  https://stacks.cdc.gov/view/cdc/237252/cdc_237252_DS1.pdf
• File Type:
  [PDF - 1.42 MB ]