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Introduction
A substantial percentage of trucks,
buses, cars, ships, etc.,
are powered by diesel engines which
produce many tons of air pollutants.
Reducing diesel pollution has become
a public priority.
Some of the main pollutants of the
exhaust gases from these engines
are particulate matter (like soot)
and nitrogen oxides (NOx) .
Soot is produced during the incomplete combustion and is composed of fine particles of carbon coated with organic chemicals.
For example,
Polycyclic aromatic hydrocarbons (PAH), which are well-known to be harmful to human health,
And besides they are considered to contribute to soot inception process.
Soot deposition on exhaust gas recirculation cooler (EGRc) , produces the malfunctioning of this device, and this fact may lead to the fulfillment of NOx standards.
The increase of soot fouling implies a decrease of thermal efficiency and the raise of pressure drop what involves greater EGR gas temperature and lower EGR gas flow.
To characterize 5 different types of diesel soot (DS) samples, collected from high pressure (HP) EGRc.
Two of these samples, named DS6 and DS9, were collected from a diesel engine bench.
The two engine bench soot samples were collected from the same engine bench: Renault M9R 2.0L , but with different EGRc by using several operation conditions.