Technical Sheet - Diesel Exhaust Treatment System Mercedes-Benz BlueTEC with AdBlue
Environmental Benefits of Achieving Ultra-Low Emissions Through Advances in Diesel Exhaust Treatment Technologies
- Latest generation of efficient clean diesel technologies
- Reduces harmful exhaust levels of nitrogen oxide (NOx)
- Allows diesel engines to meet Canadian emission standards
- Eliminates virtually all diesel particulate matter larger than 2.5 microns
In general, diesel engines are more efficient than gasoline engines but produce more harmful emissions, such as nitrogen oxide and small particles that can pollute the air. Manufacturers are developing innovative exhaust treatment systems that can reduce emissions from diesel engines while maintaining their fuel efficiency.
One example is Mercedes-Benz's BlueTEC® exhaust treatment systems. The first generation of BlueTEC® was designed to reduce nitrogen oxide and diesel particulate matter, which are by-products of combustion. Mercedes-Benz has improved the BlueTEC® system by adding an AdBlue® (diesel exhaust fluid) solution injection process, which further reduces harmful nitrogen oxide emissions.
The AdBlue® process involves injecting a urea-based solution into the hot exhaust stream. The AdBlue® solution reacts with accumulated nitrogen oxide in the selective catalytic reduction (SCR) converter to form harmless nitrogen gas and water vapour.
The ecoTECHNOLOGY for Vehicles (eTV) program received both the original BlueTEC® and the BlueTEC® with AdBlue® exhaust treatment systems from Mercedes-Benz Canada. eTV uses these displays to demonstrate how the latest generation of advanced exhaust treatment technologies can help diesel engines to meet stringent Canadian emission standards and reduce vehicle fuel consumption.
BlueTEC® AdBlue® Process
Stage 1 - Removing Carbon Monoxide and Unburned Fuel
Exhaust emissions from the engine enter the diesel oxidation catalyst to reduce the amount of carbon monoxide and unburned fuel (hydrocarbons).
Stage 2 - Removing Particulate Matter
A diesel particulate filter traps the diesel particulate matter. Pressure sensors at the inlet and outlet of the filter monitor the status of the filter. When it is full, the system triggers an increase in the exhaust temperature. The hot exhaust then purges the filter in pulses lasting approximately 2 to 4 seconds, burning off the particular matter and soot. These pulses last for several minutes.
Stage 3 - AdBlue® Injection
As the exhaust gases exit the diesel particulate filter, it mixes with the AdBlue® diesel exhaust fluid. As soon as the AdBlue® enters the hot exhaust stream, it turns into ammonia.
Stage 4 - Removing Nitrogen Oxide
In the final stage, the exhaust enters the SCR converter, where the ammonia reacts with the nitrogen oxide and the catalyst in the SCR to form harmless nitrogen and water vapour – both of which occur naturally in the air we breathe.
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