Pyrolysis Characteristic Analysis of Particulate Matter from Diesel Engine Run on Diesel/Polyoxymethylene Dimethyl Ethers Blends Based on Nanostructure and Thermogravimetry

Abstract

This paper focuses on the nanostructural and pyrolysis characteristics of particulate matter (PM) emitted from a diesel engine fueled by three diesel/polyoxymethylene dimethyl ethers (PODE n ) blends. PM was collected using a metal filter from the exhaust manifold. The collected PM samples were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). SEM and TEM analysis showed that PM generated by the 20%-PODE n blend was looser and had a smaller average diameter than that emitted when a lower proportion of PODE n was used. Additionally, fringe length was reduced, and separation distance and tortuosity were increased, when the 20%-PODE n blend was used instead of the other blends. These changes improved the oxidation reactivity of the PM. TGA demonstrated that the PM pyrolysis process was divided into low temperature (characterized by moisture and volatile components) and high temperature (the combustion of solid carbon) stages. When the blending ratio was increased, the moisture and volatile components of the PM showed no obvious change, but the ignition temperature and activation energy were reduced. Additionally, the pyrolysis performance was enhanced; the maximum weight loss rate was higher; the combustion and burnout characteristic indices were higher; and the combustion efficiency of the PM was improved. These results show that the use of diesel blended with oxygenated fuel (PODE n ) affects the nanostructure and pyrolysis of PM, and this PM is easier to oxidize and advantageous for diesel particulate filter regeneration.

Emissions of Polycyclic Aromatic Hydrocarbons and Particle-Bound Metals from a Diesel Engine Generator Fueled with Waste Cooking Oil-Based Biodiesel Blends

“…The nano particle emission concentration and their total area were also reported to be reduced by oxygenated fuel additives (Saxena and Maurya, 2016). Yang et al (2016) further indicated that the use of oxygenated diesel blends could affect the nanostructure and pyrolysis of PM, which was easier to oxidize and advantageous for diesel particulate filter regeneration. Additionally, as biodiesel has a higher cetane index than fossil diesel, it shortens the ignition delay, leading to an earlier start of combustion reaction (Musculus, 2002;Lin and Lin, 2011).…”

Techno-economic assessment and carbon footprint of processes for the large-scale production of oxymethylene dimethyl ethers from carbon dioxide and hydrogen

“…10 Several studies investigated different blends of OME with diesel fuel to conform to the EN590 standard, which showed a signicant reduction in local emissions for both heavy duty and passenger cars. [11][12][13][14][15][16][17][18][19][20][21][22][23][24] Under certain conditions, even a mixture of 10 vol% OME with diesel can lead to a signicant reduction in NO x and soot emissions. 12 A stoichiometric evaluation showed that already 10 vol% OME blend with diesel will correspond to ca.…”