CO and CO2 Emissions from Spontaneous Heating of Coal Under Different Ventilation Rates

Details

• Personal Author:
  Smith, Alex C. ; Yuan L
• Description:
  Carbon monoxide (CO) and carbon dioxide (CO2) emissions during a spontaneous heating event in a coal mine are important gases to monitor for detecting the spontaneous heating at an early stage. However, in underground coal mines, the CO and CO2 concentrations and their related fire ratios may be affected by mine ventilation. In this study, CO and CO2 emissions from spontaneous heating of a U.S. coal sample were evaluated in an isothermal oven under different airflow ventilation rates ranging from 100 to 500 cm3/min. Laboratory experiments were conducted at oven temperatures of 70, 90, and 100 degrees C. The temperature at the center of the coal sample was continually monitored, while the CO, CO2, and oxygen (O2) concentrations of the exit gas were continually measured. The results indicate that CO was generated immediately after the airflow passed through the coal, while CO2 was generated in a late phase. The amounts of CO generated under different airflow rates were approximately the same at the initial temperature of 70 degrees C, while the amounts of CO generated increased significantly as the airflow rates and initial temperatures increased. The ratio of CO/CO2 was found to be independent of airflow rate and initial temperature, approaching a constant value of 0.2 quickly if there was no thermal runaway. The value tended to decrease when a thermal runaway took place. The CO/O2 deficiency ratio was dependent on both airflow rates and the initial temperature. The experimental results are in qualitative agreement with some large-scale test and field monitoring results. [Description provided by NIOSH]
• Subjects:
  Air Movements Coal Coal Mining Engineering Geology Laboratories Mining Occupational Health Risk Assessment Safety Safety Management Temperature Ventilation Workplace

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• Keywords:
  Air-flow Author Keywords: Spontaneous Heating Of Coal Coal-gas Coal-mining Control-methods Control-systems Detection Engineering-controls Gas-detectors Gas Emissions Gases Laboratory-testing Measurement-equipment Mining-industry Quantitative-analysis Risk-analysis Safety-measures Statistical-analysis Temperature-effects Temperature-measurement Ventilation-equipment Ventilation-systems Workplace-studies

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• Series:
  Mining Publications
• ISSN:
  0166-5162
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  OMSHR - Office of Mine Safety and Health Research
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  24-30
• Volume:
  88
• Issue:
  1
• NIOSHTIC Number:
  nn:20039785
• Citation:
  Int J Coal Geol 2011 Oct; 88(1):24-30
• Contact Point Address:
  Liming Yuan, NIOSH, Office of Mine Safety and Health Research, P.O. Box 18070, 626 Cochrans Mill Road, Pittsburgh, PA, 15236, USA
• Email:
  Lcy6@cdc.gov
• CAS Registry Number:
  Carbon dioxide (CAS RN 124-38-9) ; Carbon monoxide (CAS RN 630-08-0)
• Federal Fiscal Year:
  2012
• NORA Priority Area:
  Mining
• Peer Reviewed:
  True
• Source Full Name:
  International Journal of Coal Geology
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:c1b5142dda5aeaafbfbd24bbc4ac69e98eb52348ccae02926ecc644b65ffe7ccd7657c6afad394fbf1034590fbb67301781c650078787c3e7d1294b7dcd65f96
• Download URL:
  https://stacks.cdc.gov/view/cdc/227377/cdc_227377_DS1.pdf
• File Type:
  [PDF - 1.86 MB ]