Presentation on theme: "Effect of Biodiesel Components on Cetane Number and Lubricity"— Presentation transcript:
1 Effect of Biodiesel Components on Cetane Number and Lubricity Kapila WadumesthrigeNBELDepartment of Chemical EngineeringWayne State University
2 Biodiesel Composition Methyl esters of long chain fatty acids> 98 % FAME< 2% of other componentsFree GlycerinMono, di and tri glycerideAntioxidantsSterolsPhospholipidsWater
3 Biodiesel properties High calorific value – FAME Oxidation stability- unsaturation/ antioxidantsCold flow properties- chain length/ saturation /sterols ?Ignition quality – oxygenated/ minor componentsLubricity – FAME/ FFA/other?
4 Effect of composition on biodiesel Ignition Quality 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 delayIgnition Delay-the time period between the start of injection and start of combustionDiesel fuels with required Cetane number improvecold starting, reduce smoke during start upimprove fuel economy, reduce exhaust emissions,reduce noise and vibration, improve engine durabilityFrom a number of fuel injection/combustion events, an average ignition delay (ID) can be determined. This average ID is then used in a correlation equation to determine a derived cetane numberASTM test D using IQT
5 Derived Cetane Number (DCN) of biodiesel EN standardUS standardBiodiesel samples stored under ambient conditions
6 DCN of biodiesel at various conditions Distilled biodiesel contains only FAMEDCN variation of distilled BD due to FAME composition
7 Oxidation of Distilled Cotton Seed BD Vs. Cetane number Oxidation at 110 C, 10 L/min AirFAME composition (%) of oxidized cotton seed biodiesel
8 Cetane number of BD depends on chemical composition of FAME, amount of trace compoundssecondary products due to oxidation of FAMEs.
9 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 dieselAdding bio diesel at low levels (1-2%) increase the lubricity of low sulfur diesel.
10 Lubricity increases sharply as BD blending level increase then levels off at ~2% limit.
11 Lubricity of Refined Soy Biodiesel Acid numbers; Soy BD = 0.25, Refined Soy BD = 0.19Palmatic acid equal to 0.06 Acid # added to refined Soy BD
12 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