Effects of biodiesel degree of unsaturation, chain length and physical properties on tailpipe oxides of nitrogen (NOx). (December 2022)

• Record Type: Journal Article
• Authors: Varghese, Gelu; Saeed, Khizer; Lu, Xinming; Rutt, Ken J.
• Is Part Of: Journal of the Energy Institute. Volume 105(2022)
• Page Start: 355
• Page End: 366
• Publication Date: 2022-12
• Subjects: Biodiesel -- NOx -- Emissions -- Chain length -- Degree of unsaturation -- Algae; Power (Mechanics) -- Periodicals; Power resources -- Periodicals; Fuel -- Periodicals; 621.04205
• DOI: 10.1016/j.joei.2022.10.001
• Languages: English
• ISSNs: 1743-9671

Abstract

Abstract: Biodiesel degree of unsaturation and chain length have impacts on the NOx emissions in engines. This work presents experimental investigation of the effects of biodiesel degree of unsaturation (numbers of double bonds), chain length and physical properties on NOx emissions. A methodology to decouple the effects of degree of unsaturation and chain length is presented. Results shows that NOx emissions found to increase as the degree of unsaturation increases, peaking at an average degree of unsaturation of 1.5. Shorter chain length esters found to produce lower NOx emissions which were found to decrease until the chain length factor of 0.765 was reached. Finally, NOx emissions with biodiesel para-anisidine (pA), peroxide value (PV), total oxidation (TOTOX), conjugated dienes (CD), the oxidative stability index (OSI), Viscosity, Iodine number, bis-allylic position equivalents (BAPE) is presented. Graphical abstract: Image 1 Highlights: A unique methodology to decouple and quantify the chain length and degree of biodiesel is presented. Increased degree of unsaturation in biodiesel produces increased NOx emission. Shorter chain length biodiesel produces lower NOx emission. Acid Value and CD value have no correlations with NOx emissions. PA value, TOTOX value, Viscosity, Iodine Value and BAPE value have correlations with NOx emissions.