bluetec diesel technology
DESCRIPTION
The latest from Mercedes for removing the NOx from the emission.TRANSCRIPT
Welcome
GOING GREEN WITH BLUEBLUETEC Diesel Technology
Saju S09MAE038
BLUETEC Diesel technology
Tier Date CO THC NMHC NOx HC+NOx PM P
Diesel
Euro 1 July 1992 2.72 (3.16) - - -0.97
(1.13)0.14
(0.18)-
Euro 2 January 1996 1.0 - - - 0.7 0.08 -
Euro 3 January 2000 0.64 - - 0.50 0.56 0.05 -
Euro 4 January 2005 0.50 - - 0.25 0.30 0.025 -
Euro 5 September 2009 0.500 - - 0.180 0.230 0.005 -
Euro 6 September 2014 0.500 - - 0.080 0.170 0.005 -
European emission standards for passenger cars (g/km)
BLUETEC Diesel technology
Exhaust gas regulation (EGR)
Recirculates a portion of an engine's exhaust gas back to the engine cylinders.• EGR reduces the amount of NoxBut...• Reduces the specific heat ratio of the combustion gases and hence the power• Increase in particulate emissions
NOx Aftertreatment systems
• 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.
Conventional NOx removal
Optimized diesel engine and combustion system
An aftertreatment system with DOC, DPF and an NSC-SCR or active SCR catalyst system
AdBlue Dosing System
Enhanced ECU functionality and calibration
BLUETEC Diesel technology
DOC – Direct Oxidation CatalystDPF – Diesel Particulate FilterNSC – NOx Storage catalystSCR – Selective Catalytic reaction
BLUETEC Diesel technology
Diesel oxidation catalyst (DOC)
• 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
Diesel Particulate Filter (DPF)
• 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
BLUETEC Diesel technology
BLUETEC
BLUETEC with NSC advanced
BLUETEC Diesel technology
• 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.
BLUETEC Diesel technology
How BLUETEC with NSC Converter works
In normal lean
operation (Lambda > 1) , NO
is first oxidized to form
NO2
Then, via nitrate
formation (NO3)
stored in the
catalytic converter
on an alkaline metal oxide (e.g.
barium oxide).
Rich exhaust-
gas conditions (Lambda
< 1) is set which
contain so much
reduction agent
(CO, H2, HC) that
the nitrate bond is
suddenly dissolved
and reduced to non-toxic
nitrogen (N2)
directly on the noble-metal-coated
catalytic converter.
NH3
formed is further reduced to N2 and H2O in the
SCR catalytic
converter.
Intermittent rich fuel mixture is injected
which is controlled by the ECU depending on the NOx content in the
NSC converter
BLUETEC Diesel technology
BLUETEC with Urea SCR
BLUETEC Diesel technology
• A close-coupled oxidation catalyst• A particulate filter • A catalyst implemented with an SCR coating.• An AdBlue dosing Valve
BLUETEC Diesel technology
How BLUETEC with Urea SCR works
NOx which passes through the DOC and
DPF enters the SCR catalytic
converter
The AdBLUE solution splits to form NH3 in the presence of exhaust
heat
The NH3 in SCR catalytic
converter reacts with the Nox from the exhaust gas
which is further
reduced to N2 and H2O
Intermittent injection of metered quantity of AdBLUE solution is controlled by the ECU
BLUETEC Diesel technology
BLUETEC Diesel technology
Comparison of two BLUETEC modes
The use of a NOx storage catalytic converter for NOx aftertreatment leads to a further impact to the fuel consumption
BLUETEC Diesel technology
SCR system integration
BLUETEC Diesel technology
Comparison
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 Diesel technology
Disadvantages
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
BLUETEC Diesel technology
Conclusion
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
References
BLUETEC Diesel technology
Thank You
BLUETEC Diesel technology