Diesel Oxidation Catalytic Converters for Underground Mining Applications

Details

• Personal Author:
  Bugarski, Aleksandar D. ; Hummer JA ; Robb GM
• Description:
  The diesel oxidation catalytic converter (DOC) has been extensively used by the underground mining industry to reduce exposure of workers to carbon monoxide (CO) and hydrocarbons (HC) emitted by diesel engines. The effects of those devices on the gaseous and diesel particulate matter emissions strongly depend on catalyst formulation. Recently, certain formulations of catalytic coatings used in DOCs marketed to underground mining were scrutinized for their potential to adversely affect emissions of the highly toxic compound, nitrogen dioxide (NO2). This study was conducted to get a better understanding of the effects that contemporary and emerging DOC technologies have on gaseous emissions. For test purposes, an EPA certified Tier 2 engine was retrofitted with two DOCs, one with a catalytic coating traditionally marketed to the underground mining industry (DOC 1), and the other with a novel coating designed to minimize undesirable NO2 emissions (DOC 2). The evaluation was done for various steady-state engine operating conditions, generating exhaust with temperatures between 200 degrees C and 400 degrees C and one mining related transient cycle. Despite differences in catalyst formulations, both evaluated DOCs similarly reduced CO (63 to 98 %) and HC (16-32%) emissions. However, for the majority of test conditions, the NO2 emissions were found to be adversely affected by DOC 1. Dramatic increases in NO2 emissions were observed at conditions that produced exhaust temperatures above 300 degrees C. Conversely, DOC 2 was found to favorably affect NO2 emissions for all test conditions. The findings of this study suggests that DOC catalyst formulations and systems can be successfully designed and optimized for underground mining applications to provide the desired reductions in CO and HC emissions without de novo generation of NO2 and in certain circumstances, provide a reduction in NO2 emissions. [Description provided by NIOSH]
• Subjects:
  Air Movements Coal Coal Mining Hydrocarbons Mining Occupational Health Particulate Matter Risk Assessment Risk Factors Safety Vehicle Emissions Ventilation

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• Keywords:
  Air-flow Author Keywords: Diesel Oxidation Catalyst Carbon-compounds Coal-mining Diesel-emissions Diesel-engines Diesel-exhausts Emission-sources Exposure-levels Gases Longwall-mining Mining-industry Nitrogen Dioxide Oxidation Particulates Risk-factors Underground-mining Underground Mining Ventilation-equipment

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• Series:
  Mining Publications
• Publisher:
  Virginia Tech
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  New York ; OSHA Region 2 ; OSHA Region 3 ; Pennsylvania ; Virginia
• 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:
  15-37
• NIOSHTIC Number:
  nn:20046527
• Citation:
  Proceedings of the 15th North American Mine Ventilation Symposium, June 20-25, 2015, Blacksburg, Virginia. Blacksburg, VA: Virginia Tech, 2015 Jun; :15-37
• Contact Point Address:
  Aleksandar D. Bugarski, National Institute for Occupational Safety and Health, Office of Mine Safety and Health Research, 626 Cochrans Mill Rd., Pittsburgh, Pennsylvania 15236, U.S.A.
• Email:
  abugarski@cdc.gov
• CAS Registry Number:
  Carbon monoxide (CAS RN 630-08-0) ; Nitrogen dioxide (CAS RN 10102-44-0)
• Federal Fiscal Year:
  2015
• NORA Priority Area:
  Mining
• Peer Reviewed:
  False
• Source Full Name:
  Proceedings of the 15th North American Mine Ventilation Symposium, June 20-25, 2015, Blacksburg, Virginia
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:05fdada50ce372bd26b4efdeace6491a06dc9fc741f479147c90b277955048d97ac7418ea231423d10e7c4dd0ba8db1ac0f6215ec5e2ec7d6136e3f8e391365f
• Download URL:
  https://stacks.cdc.gov/view/cdc/228148/cdc_228148_DS1.pdf
• File Type:
  [PDF - 2.40 MB ]