posted on 2007-07-15, 00:00authored byShida Tang, Brian P. Frank, Thomas Lanni, Greg Rideout, Norman Meyer, Chris Beregszaszy
This study evaluated the effects of various combinations
of fuels and emission control technologies on exhaust
emissions from a heavy-duty diesel engine tested on an
engine dynamometer. Ten fuels were studied in twenty four
combinations of fuel and emission control technology
configurations. Emission control systems evaluated were
diesel oxidation catalyst (DOC), continuously regenerating
diesel particulate filter (CRDPF), and the CRDPF coupled
with an exhaust gas recirculation system (EGRT). The effects
of fuel type and emission control technology on emissions
of benzene, toluene, ethylbenzene, xylene (BTEX), and 1,3-butadiene, elemental carbon and organic carbon (EC/OC),
carbonyls, polycyclic aromatic hydrocarbons (PAHs),
and nitro-PAHs (n-PAHs) are presented in this paper.
Regulated gaseous criteria pollutants of total hydrocarbons
(THC), carbon monoxide (CO), oxides of nitrogen (NOx)
and particulate matter (PM) emissions have been reported
elsewhere. In general, individual unregulated emission
with a CRDPF or an EGRT system is similar (at very low
emission level) or much lower than that operating solely with
a DOC and choosing a “best” fuel. The water emulsion
PuriNOx fuel exhibited higher BTEX, carbonyls and PAHs
emissions compared to other ultralow sulfur diesel (ULSD)
fuels tested in this study while n-PAH emissions were
comparable to that from other ULSD fuels. Naphthalene
accounted for greater than 50% of the total PAH emissions
in this study and there was no significant increase of
n-PAHs with the usage of CRDPF.