Journal
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
Volume 22, Issue 5, Pages 1395-1420Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1468087420910886
Keywords
Alcohols; internal combustion engine; fundamental combustion; soot; polycyclic aromatic hydrocarbons
Funding
- National Natural Science Foundation of China [51806014]
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Alcohol fuels such as methanol, ethanol, butanol, and pentanol have been extensively studied as potential clean fuels to reduce soot emissions from incomplete combustion of hydrocarbon fuels. Research has shown a decreasing or synergistic effect of alcohol additions on soot formation and revealed the mechanism behind it. However, further studies are needed to understand the formation mechanism of soot in complex environments and the detailed effects of alcohols on soot production.
Soot is one of the main pollutants produced by incomplete combustion of hydrocarbon fuels, which poses a serious threat to human health and the urban environment. Alcohols have been generally considered to be a potential clean fuel to reduce soot emissions. At present, alcohol fuels represented by methanol, ethanol, butanol and pentanol have been extensively studied and have made remarkable progress. Therefore, this article is written as a broad overview of the subject. The effects of methanol, ethanol, butanol and pentanol additions on the formations of soot and polycyclic aromatic hydrocarbons were systematically summarized from the two aspects of the internal combustion engine bench and the fundamental combustion system. These studies have shown a decreasing or synergistic effect of alcohols addition on soot formation and initially revealed the mechanism of soot formation. However, the formation mechanism of soot in complex environments and the mechanism of the effects of alcohols on soot still need to be studied in depth, which can provide more opportunities for humans to reduce soot production during the combustion of hydrocarbon fuels. Finally, some challenges and research suggestions are outlined in the last section of this review.
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