Geenreally blue tec refers to the technology used by Mercedes
benz to cut Nox gases emmissions used in the EURO rating.
But the word is abused by bus fans to mean the actual fuel
additive added.
So another definition
BlueTec
> A fuel additive added to the MB engine cupled with SCR to
achieve EURO 3 or above. Bluetec essentially component
includes urea (er....). the nitrogen moluecules (ions?) in
urea react with emmission ages to remove posionous gaes.
the BlueTec kisok is built right next to the normal disel
fueling kisok so that both fuel and fuel additive cna be filled up
at same time. Bluetec additive fuels up using 10 percent the normal
disel fuel time so its not really a hassle to fuel a MB EURO 3 or
above bus.
Fuel addictive? Rather an exhaust treatment addictive.
Adblue is injected after the turbocharger section of the exhaust
'journey', thereafter everything enters the SCR catalytic converter
chamber, before releasing out. This chamber is fitted instead of a
muffler.
Mercedes Benz calls this technology Bluetec. Just like MAN has
their PM-KAT for their EGR system, Scania just calls it EGR for the
same technology.
Nissan Diesel uses FLENDS (Final Low Emission New Diesel System)
for their SCR technology, and is also applied in parallel with EGR
on their Spacerunner RA series city bus (JDM) with MD92 series
engines.
Nissan Diesel is the first company in the world to incorporate
common rail diesel injection with an EGR system and a SCR one to
produce buses with the lowest emissions on the market, coupled with
fuel efficiency European buses can only envy at. Mitsubishi Fuso
and Hino Motors prefer pure EGR on their systems, achieving the
same level of emissions and fuel efficiency.
The chemical workflow of Adblue and exhaust goes like this:
CO(NH2)2+H2O (=AdBlue) --> 2NH3+CO2 --> 4NO+4NH3+O2 -->
4N2+6H2O
