Emission Reductions of Carbonyl Compounds in a Heavy-Duty Diesel Engine Supplemented with H2/O2 Fuel

Abstract

Carbonyl compounds play an important role in atmospheric chemistry, and have adverse effects on human health because they are precursors of ozone and peroxyacyl nitrates. This study investigated the emissions of carbonyl compounds from a heavy-duty diesel engine (HDDE) at one low load steady-state condition (24.5% of the max load at 40 km/h). The experimental results indicate that the emissions of total carbonyl concentrations decreased by 4.7% to 32.3% when 10 to 70 L/min H 2 /O 2 mixture was added to neat diesel fuel. The emissions of nine individual carbonyl species also decreased. Among these, formaldehyde was the major species, accounting for 80.4%-81.5% of the total concentrations in the exhausts of all tested fuels, and its emissions were reduced from 5.1% to 31.7%. Meanwhile, the emission factors of total carbonyl compounds, in mg/L, decreased from 3.6% to 13.0%, and those of total carbonyl compounds, in mg/kWh, decreased from 4.6% to 32.3%. These results indicate that the addition of a H 2 /O 2 mixture to neat diesel fuel can reduce emissions form diesel engines to the atmosphere.

Application of HCCI Engine in Motorcycle for Emission Reduction and Energy Saving

“…However, catalytic converters would not reduce carbon dioxide (CO 2 ), a major cause of global warming effect. Several researches on blends fuel or additives reached the improvements of engine efficiency and emission reduction, such as microalgae biodiesel, butanol, water, H 2 /O 2 mixture, or plasma-enhanced combustion in diesel engines (Lu et al, 2013;Lin et al, 2013;Wang et al, 2013;Shukla et al, 2014;Mwangi et al, 2015). However, they cannot be used for motorcycle engine.…”

Experimental Study on HCCI Combustion in a Small Engine with Various Fuels and EGR

“…However, catalytic converters do not reduce carbon dioxide (CO 2 ), which is a main contributor of the global warming effect. Several fuel blends and additives that improve engine efficiency and reduce emissions in diesel engines have been developed, such as microalgae biodiesel (Mwangi et al, 2015a, b), biodiesel (Lu et al, 2013;Shukla et al, 2014), H 2 /O 2 mixture (Wang et al, 2012(Wang et al, , 2013, and plasma . However, they cannot be used in motorcycle engines.…”