The introduction of diesel particulate filters (DPF) technology has been an important step towards controlling diesel emission from heavy-duty diesel -powered underground mining vehicles. The Johnson Matthey CRT® (Continuously Regenerating Trap) technology that combines a diesel oxidation catalyst (DOC) with a DPF has be extensively used to trap harmful diesel aerosols, CO and hydrocarbons from on-road vehicles. In order to address concerns over adverse effects of CRT® system on NO₂ emissions and allow for use of these systems in underground mining environments, Johnson Matthey (JM) developed, the Mining CRT® system which integrates CRT® technology with NO₂ abatement components. The effects of the system on particulate and gaseous emissions were evaluated in the engine dynamometer laboratory. The evaluation was done using Caterpillar C11, Tier 3 engine operated over the ISO 8178, 8-mode test cycles. The engine was fueled with an ultra–low-sulfur diesel fuel. The system was found to effectively reduce total particulate mass and number, total hydrocarbon, and CO emissions. The novel fuel injection and NO₂ decomposition catalyst were found to be effective in preventing NO₂ slip out of the system.
