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Technical Sheet - Mercedes-Benz BlueTEC
Designed to Run on the Low Sulphur Diesel Fuel (15 ppm)
Environmental Benefits of a Diesel Exhaust After-Treatment System
- Reduces harmful exhaust levels of nitrogen oxide
- Allows diesel engines to meet emission standards
- Eliminates particulate matter and soot
The ecoTECHNOLOGY for Vehicles (eTV) program received the Mercedes-Benz BlueTEC® exhaust treatment system as a donation from Mercedes-Benz Canada, for use in demonstrating how the latest generation of advanced exhaust after-treatment technologies can help diesel engines to meet stringent Canadian emission standards. The display includes an oxidizing catalytic converter connected directly to a nitrogen oxide (NOx) storage catalyst. Exhaust piping then connects the diesel particulate filter to the selective catalytic converter (SCR).
The BlueTEC® exhaust treatment system was designed for the reduction of nitrogen oxides and diesel particulate matter that are by-products of an efficient diesel engine process. BlueTEC® is based on a combination of engine-design measures that lower particulate emissions, coupled with a further reduction of nitrogen oxides downstream of the engine.
Although diesel particulate matter, soot and smoke can be managed with advanced particulate filters and higher fuel injection pressures, Canadian emission regulations are designed to ensure a reduction in the level of nitrogen oxides. BlueTEC® limits nitrogen oxide emissions with the use of a storage catalyst and an SCR converter.
eTV is evaluating this technology in partnership with Mercedes-Benz Canada. As well, eTV is researching similar exhaust after-treatment systems through partnerships with the National Research Council of Canada.
Exhaust emissions from the diesel engine enter the diesel oxidation catalyst to reduce the amount of carbon monoxide (CO) and unburned hydrocarbons (HC).
Emissions are processed through an advanced NOx storage catalyst (NSC). Nitrogen oxide emissions are stored during periods of lean engine operation, and cycled for approximately 120 to 180 seconds. Regeneration of the catalyst is accomplished by changing the engine fuel-air ratio to a richer operating condition. The regeneration cycle lasts for approximately 2 to 4 seconds, releasing ammonia into the exhaust.
A diesel particulate filter traps the particulate matter and soot. As soot is filtered, pressure sensors at the inlet and exit of the filter detect changes in pressure, notifying the engine control unit that the filter is full and to increase the exhaust temperature. The hot exhaust purges the filter in pulses lasting approximately 2 to 4 seconds, burning off the soot. These pulses will last for several minutes.
Ammonia from the NSC is stored in an SCR converter. The stored ammonia reacts with the catalyst, removing the remaining NOx emissions. The final by-products are nitrogen and water vapour, gases that occur naturally in the air.
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