This paper investigated the relationship between the emission of three toxic gases, CO, NO, and NO2, by diesel-powered equipment used in underground metal/nonmetal mines and the ambient concentration of the same compounds in the mine's atmosphere. The results presented are part of two comprehensive studies conducted by NIOSH researchers at the Newmont gold mine in Carlin, Nevada, in September 2010 and May 2011. The tests were conducted on different vehicles during normal operation (Phase I) and during a simulated repeated duty cycle in an isolated zone of the mine (Phase II). During Phase I, the concentration of CO, NO, and NO2 in the tailpipe of the diesel engine, along with concentration detected in two locations on the vehicle, showed that the main contributor to the level of the three compounds measured on the vehicle was the exhaust of the vehicle itself. The results of Phase II supported the concept of a cause (tailpipe) - effect (ambient concentration) relationship for the abundance of CO, NO, and NO2.The measurement of the ambient concentrations of the selected toxic gases in three locations during Phase II provided other important outcomes: i.e., that the monitoring outcomes can be strongly affected by the location chosen for the measurement. While the cab of the vehicles used in Phase I was not found to have a substantial effect on the three pollutants, the concentration of CO, NO, and NO2 was found to be consistently higher outside than inside the enclosed cabs in Phase II. Based on this study, it is not possible to make any conclusion about the role of the cab's filtering system used in Phase II. Further, the position of the front of the vehicle in relation to the dilution air in Phase II might have had enhanced the effect. Nevertheless, the selection of where to locate the monitoring device was found to play a crucial role The average concentrations of the three gases in the isolated zone downwind of the vehicle were comparable to the values recorded on the vehicle, but they were generally higher than inside the enclosed cab. Finally, a prevented urea injection in a Tier4i diesel engine was found to be capable of increasing the concentrations of NO and NO2 three and four times, respectively, compared to a functioning Tier4i diesel package.


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    Title :

    Tailpipe emissions and ambient concentrations of pollutants from diesel engines during in-use and isolated zone studies


    Additional title:

    Auspuff-Emissionen und Umgebungskonzentrationen von Schadstoffen aus Dieselmotoren in Studen während des Betriebs und in isolierten Bereichen


    Contributors:
    Cauda, E.G. (author) / Patts, L.D. (author) / Bugarski, A.D. (author) / Janisko, S.J. (author) / Hummer, J.A. (author) / Terrillion, T. (author) / Kiefer, J. (author)


    Publication date :

    2012


    Size :

    7 Seiten, 4 Bilder, 2 Tabellen, 8 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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