BLUETEC DIESEL TECHNOLOGY

GOING GREEN WITH BLUEBLUETEC Diesel Technology
Saju S
09MAE038

BLUETEC Diesel technology

Recirculates a portion of an engine's exhaust gas back to the engine cylinders.
EGR reduces the amount of Nox
But...
Reduces the specific heat ratio of the combustion gases and hence the power
Increase in particulate emissions
HC DeNOx as a non-selective NOx reduction method using HC components in suitable catalytic converters.
HC DeNOx processes have only a very narrow NOx reduction temperature window and are therefore mainly effective in urban cycles.

DOC – Direct Oxidation Catalyst
DPF – Diesel Particulate Filter
NSC – NOx Storage catalyst
SCR – Selective Catalytic reaction

Break down pollutants from diesel engines in the exhaust stream through a chemical process.
Monolith honeycomb substrate coated with platinum group metal catalyst, packaged in a stainless steel container
Porous honeycomb structure that catches the soot as it passes through.
Removes a majority of
NOx
Particulate matter (think black, cough-inducing soot)
Unburned hydrocarbons from burned diesel fuel

A close-coupled oxidation catalyst
An advanced NOx storage catalyst (NSC)
A particulate filter
A catalyst implemented with an SCR coating for furtherimprovement of the NOx reduction and to deal with the sulfur emission which is stored and released from the NSC due to fuel sulfur to ensure the long-term stability.

Intermittent rich fuel mixture is injected which is controlled by the ECU depending on the NOx content in the NSC converter

A close-coupled oxidation catalyst
A particulate filter
A catalyst implemented with an SCR coating.
An AdBlue dosing Valve

Intermittent injection of metered quantity of AdBLUE solution is controlled by the ECU

The use of a NOx storage catalytic converter for NOx aftertreatment leads to a further impact to the fuel consumption

Requires low sulfur diesel (ULSD) Less then 15 ppm.
The SCR-technology costs are negatively influenced by the AdBlue tank and dosing system.
The SCR-technology requires replenishment of AdBlue at regular intervals.
The low freezing point of urea needs adequate measures for winter functioning.
NOx storage exhaust-gas aftertreatment processes, will also lead to increased HC emissions.

BLUETEC has the cleanest diesel emissions.
BLUETEC enabled Mercedes Benz E 320 to meet EURO VI norms already.
Customers would benefit from better fuel mileage.
It is predicted that the diesel sales will quadruple in the next decade and hence an ultimate solution for NOx emissions
20 to 40% better mileage then gasoline

SAE Technical paper - BLUETEC Diesel Technology
C. Enderle, G. Vent and M. Paule
Daimler AG
http://www.mercedes-benz.com/content/mbcom/international/international_website/en/com/Mercedes-Benz_Brand_Galery_BLUETEC.html
http://rb-kwin.bosch.com/us/en/powerconsumptionemissions/exhaust-gastreatment/dieselengines/exhaust-gas_management/storagecatalyticconverter.html
http://en.wikipedia.org/wiki/BlueTec
http://en.wikipedia.org/wiki/EGR#EGR_in_diesel_engines
http://www.worldcarfans.com/10601108065/mercedes-benz-bluetec-technology
http://alternativefuels.about.com/od/researchdevelopment/a/bluetec.htm

BLUETEC DIESEL TECHNOLOGY

by coolsaju on Sep 29, 2009

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BLUETEC DIESEL TECHNOLOGY — Presentation Transcript