Reducing diesel NOx and PM emissions of diesel buses and trucks.
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2008-07-01
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Alternative Title:Reducing diesel nitrogen oxide and particulate matter emissions of diesel buses and trucks.
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Abstract:The objective of the present investigation was development of a high efficiency
selective catalytic reduction (SCR) system for reducing diesel nitrogen oxides (NOx) and
particulate matters of diesel trucks. The investigation was divided into two parts. First the
flow characteristics of a coil-shaped injector were investigated using a turbulent jet
facility at the Center for Energy and Environmental Research and Services (CEERS)
laboratory. For this part of the investigation, air was used as both injection and exhaust
gases. Results indicate that the coil injector enhances mixing process between the axial
flow and the injecting flow. However, due to the asymmetry of the injection process, the
mixing is not uniform and may results in ammonia slippage during the exhaust after
treatment process. In part two of the investigations, an SCR system with a separate
injector and mixer was developed and the system was tested on the exhaust of a 3-
cylinder diesel engine under a moderate load condition, using 36% by weight urea as the
reducing agent. Results show 81% reduction in NOx emissions. The present investigation
provides information on a coil-shaped injector-mixer device as part of a SCR system that
can be scaled for different size diesel engines for significant reductions in NOx
emissions.
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