Abstract
Methanol and biodiesel are both alternative fuels of diesel engines. In order to study the effects of methanol on the microstructure of particulates produced from the diesel engine fueled with a methanol/biodiesel blend, the methanol/biodiesel blend fuels with 0, 10, and 20% methanol were prepared (named B100, BM10, and BM20, respectively). SEM and TG experiments have been carried out, and the structural and oxidative characteristics of particulates for the methanol/biodiesel blend were investigated. The results showed that the average diameters of B100, BM10, and BM20 particulates were 35, 32.6, and 31.2 nm, respectively. With the increase of methanol blending ratio, the H2O and SOF (soluble organic fraction) contents were increased and the soot content in particulates was reduced slightly. In addition, the activation energy of the particulate pyrolysis reaction was reduced with the increase of methanol mixing ratio, and the oxidative reaction of particulates was easier to carry out.
Highlights
Diesel engines are widely used in automobiles, agricultural machinery, construction machinery, ships, railway locomotives, and other ancillary machinery
Four kinds of blends were prepared: 10% methanol blending with 90% biodiesel, 20% methanol blending with 80% biodiesel, and biodiesel was named B100
The particulates of methanol/biodiesel blends with methanol mixing ratios of 0, 10, and 20% were collected under the experimental conditions of 2000 rpm and 75% load
Summary
Diesel engines are widely used in automobiles, agricultural machinery, construction machinery, ships, railway locomotives, and other ancillary machinery. The study on PM can offer information to establish stringent fuel policies. It can provide knowledge about the impact of alternative fuels on aftertreatment devices (such as diesel particulate filter, DPF). Harish’s study revealed that, using methanol in diesel engines increased the combustion duration and cylinder pressure with reduced NOx, PM, and smoke emissions due to reduced ignition delay and higher latent heat evaporation.[6] As the physical and chemical properties of methanol and diesel were quite different, adding methanol to biodiesel had a great impact on the physical and chemical properties of blended fuel. Žaglinskis’s study showed a similar result, which was when 10% methanol was added to biodiesel, the maximum reduction of CO was 13% and the maximum reduction of soot was 45% in diesel engines.[8]
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