Presentation on theme: "Effect of Biodiesel Components on Cetane Number and Lubricity Kapila Wadumesthrige NBEL Department of Chemical Engineering Wayne State University."— Presentation transcript:
Effect of Biodiesel Components on Cetane Number and Lubricity Kapila Wadumesthrige NBEL Department of Chemical Engineering Wayne State University
Biodiesel Composition Methyl esters of long chain fatty acids > 98 % FAME < 2% of other components –Free Glycerin –Mono, di and tri glyceride –Antioxidants –Sterols –Phospholipids –Water
Biodiesel properties High calorific value – FAME Oxidation stability- unsaturation/ antioxidants Cold flow properties- chain length/ saturation /sterols ? Ignition quality – oxygenated/ minor components Lubricity – FAME/ FFA/other?
Effect of composition on biodiesel Ignition Quality ASTM test D using IQT DCN = 83.99(ID-1.512) measure of the ignition quality of diesel fuel via the compression ignition process. is actually a measure of a fuel's ignition delay Ignition Delay-the time period between the start of injection and start of combustion Diesel fuels with required Cetane number improve –cold starting, reduce smoke during start up –improve fuel economy, reduce exhaust emissions, –reduce noise and vibration, improve engine durability
Derived Cetane Number (DCN) of biodiesel EN standard US standard Biodiesel samples stored under ambient conditions
DCN of biodiesel at various conditions Distilled biodiesel contains only FAME DCN variation of distilled BD due to FAME composition
FAME composition (%) of oxidized cotton seed biodiesel Oxidation of Distilled Cotton Seed BD Vs. Cetane number Oxidation at 110 C, 10 L/min Air
Cetane number of BD depends on chemical composition of FAME, amount of trace compounds secondary products due to oxidation of FAMEs.
Effect of major and minor components of biodiesel on petroleum and synthetic fuel Quality that prevents wear when two moving metal parts come in contact with each other. Desulphurization reduces the inherent lubricity of diesel Adding bio diesel at low levels (1-2%) increase the lubricity of low sulfur diesel.
Lubricity increases sharply as BD blending level increase then levels off at ~2% limit.
Lubricity of Refined Soy Biodiesel Acid numbers; Soy BD = 0.25, Refined Soy BD = 0.19 Palmatic acid equal to 0.06 Acid # added to refined Soy BD
Lubricity increases sharply as BD blending level increase then levels off at ~2% limit. BD lubricity is due to combination of major and minor components