Effect of diesel oxidation catalysts on nitrogen dioxide production from diesel mining equipment

CIM Journal, Vol. 7, No. 1, 2016

J. Stachulak
MIRARCO Mining Innovation, Sudbury, Ontario, Canada

M. Gangal
Natural Resources Canada, CanmetMINING, Ottawa, Ontario, Canada

C. Allen
Vale Ontario Operations, Copper Cliff, Ontario, Canada

http://dx.doi.org/10.15834/cimj.2016.2
Abstract Most underground diesel equipment is equipped with diesel oxidization catalysts (DOCs) to reduce carbon monoxide and hydrocarbon emissions. DOCs do not alter nitrogen oxides concentrations but can promote the oxidization of nitric oxide (NO) to the more toxic nitrogen dioxide (NO2). Vale and CanmetMINING have been researching how to reduce worker exposure to diesel emissions by testing mining equipment DOCs. Results indicate a > 77% decrease in carbon monoxide concentration but a 46–315% increase in NO2 concentration for 8-mode test cycles. It is recommended that DOCs that increase NO2 emissions be evaluated regarding their continued use in underground operations.
Keywords: Catalytic converter, Diesel emission, Diesel engine, Diesel oxidation catalysts (DOCs), Load haul dump (LHD), Mine air quality, Nitrogen oxides (NOx), Total hydrocarbon concentrations (THC), Underground mines, Ventilation
Résumé La plupart des équipements miniers souterrains sont équipés de catalyseurs d’oxydation diesel (DOC) afin de réduire les émissions de monoxyde de carbone et d’hydrocarbures. Les DOC ne modifient pas les concentrations des oxydes d’azote mais ils peuvent faciliter l’oxydation du monoxide d’azote (NO) en dioxyde d’azote (NO2), plus toxique. Vale et CanmetMINING effectuent des recherches pour réduire l’exposition des travailleurs aux émissions de diesel en analysant les DOC des équipements miniers. Selon les résultats, une diminution > 77 % dans la concentration de monoxyde de carbone est atteinte mais elle est accompagnée d’une augmentation de 46 à 315 % de la concentration en NO2 pour des cycles d’essais à 8 modes. Il est recommandé d’évaluer les DOC qui augmentent les émissions de NO2 pour décider de la poursuite de leur utilisation dans les opérations souterraines.
Mots-Clé Catalyseurs d’oxydation diesel (DOC), chargeuse-navette, concentrations en hydrocarbures totaux, convertisseur catalytique, émission diesel, mines souterraines, moteur diesel, oxydes d’azote (NOx), qualité de l’air dans les mines, ventilation
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