A CART Technique to Adjust Production from Longwall Coal Operations Under Ventilation Constraints

Details

• Personal Author:
  Goodman, Gerrit V. R. ; Karacan, C. Özgen
• Description:
  Methane emissions in longwall coal mines can arise from a variety of geologic and production factors, where ventilation and degasification are primary control measures to prevent excessive methane levels. However, poor ventilation practices or inadequate ventilation may result in accumulation of dangerous methane-air mixtures. The need exists for a set of rules and a model to be used as guidelines to adjust coal production according to expected methane emissions and current ventilation conditions. In this paper, hierarchical classification and regression tree (CART) analyses are performed as nonparametric modeling efforts to predict methane emissions that can arise during extraction of a longwall panel. These emissions are predicted for a range of coal productivities while considering specific operational, panel design and geologic parameters such as gas content, proximate composition of coal, seam height, panel width, cut height, cut depth, and panel size. Analyses are conducted for longwall mines with and without degasification of the longwall panel. These models define a range of coal productivities that can be achieved without exceeding specified emissions rates under given operating and geological conditions. Finally, the technique was applied to longwall mines that operate with and without degasification system to demonstrate its use and predictive capability. The predicted results proved to be close to the actual measurements to estimate ventilation requirements. Thus, the CART-based model that is given in this paper can be used to predict methane emission rates and to adjust operation parameters under ventilation constrains in longwall mining. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Air Pollution Air Pollution, Indoor Coal Coal Mining Geology Methane Mining Occupational Health Safety Ventilation

  More +
• Keywords:
  Air-contamination Air-quality Analytical-instruments Analytical-models Author Keywords: Mining Safety CART Analyses Coal-gasification Coal-mining Coal Mine Methane Control-methods Control-systems Emission-sources Exposure-levels Exposure-limits Gas-mixtures Gases Longwall-mining Longwall Mines Mathematical-models Measurement-equipment Methane Emissions Methanes Mine-gases Mining-industry Models Underground-mining Ventilation-systems

  More +
• Series:
  Mining Publications
• ISSN:
  0925-7535
• 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
• Volume:
  50
• Issue:
  3
• NIOSHTIC Number:
  nn:20040133
• Citation:
  Saf Sci 2012 Mar; 50(3):510-522
• Contact Point Address:
  C.Ö. Karacan, National Institute of Occupational Safety and Health (NIOSH), Office of Mine Safety and Health Research (OMSHR), Dust Control, Ventilation, and Toxic Substances Branch, Pittsburgh, PA 15236, USA
• Email:
  cok6@cdc.gov
• CAS Registry Number:
  Methane (CAS RN 74-82-8)
• Federal Fiscal Year:
  2012
• NORA Priority Area:
  Mining
• Peer Reviewed:
  True
• Source Full Name:
  Safety Science
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:a86607c685092d99714501d9b4d1519d602166911783f5f308c6db69aff294f245f48c3264afc6d862f59cb9a372c651d2f04a6ee457897474278b3d1fa60f4c
• Download URL:
  https://stacks.cdc.gov/view/cdc/227405/cdc_227405_DS1.pdf
• File Type:
  [PDF - 1.26 MB ]