Diesel-Range Fuel Property Effects on Medium-Duty Advanced Compression Ignition for Low-Load NO X Reduction
Journal Article
04-16-01-0006
ISSN: 1946-3952, e-ISSN: 1946-3960
Sector:
Topic:
Citation:
Sluder, C. and Curran, S., "Diesel-Range Fuel Property Effects on Medium-Duty Advanced Compression Ignition for Low-Load NOX Reduction," SAE Int. J. Fuels Lubr. 16(1):57-74, 2023, https://doi.org/10.4271/04-16-01-0006.
Language:
English
Abstract:
A diesel premixed-charge compression ignition (PCCI) technique was used at low
loads at which exhaust temperature makes urea-selective catalytic reduction
(SCR) use for nitrogen oxides (NOx) reduction challenging. A fuels matrix to
examine the effects of increasing fuel volatility, bio-blendstocks, and cetane
number on PCCI was formulated using a near-constant 15% aromatic content. The
results showed that PCCI could provide greater than 67% NOx emissions reductions
at 1,200 RPM, 3.1 bar indicated mean effective pressure (IMEP), and 2.0 bar
IMEP. The filter smoke number (FSN) could also be reduced relative to a
conventional diesel combustion (CDC) baseline. The reductions in FSN were more
moderate in the order of 40-50%, depending upon the fuel used, IMEP, and
combustion phasing (CA50) timing. Hydrocarbon (HC) emissions could be held to a
marginally lower level than CDC emissions at some CA50 conditions by using
higher-volatility and higher cetane number fuels and could potentially be traded
for further NOx reductions. This outcome is important as it points to the
possibility of achieving significant NOx reduction while doing no harm in terms
of HC emissions. Carbon monoxide (CO) emissions increased in PCCI, but
increasing the fuel volatility and cetane number could be helpful in keeping
these emissions at a manageable level.