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Effect of Nox Emissions in a Bio-Fuelled Di Diesel Engine

R. Muneeswaran, Dr.M.R.Thansekhar

Biodiesel is associate ventilated diesel oil made up of vegetable oils and animal fats by changing the triglyceride fats to esters via varied esterification processes. A number of studies have shown substantial particulate matter (PM) reductions for biodiesel and biodiesel(canola oil) blended with petroleum diesel relative to petroleum diesel. However, most studies also show a significant increase in nitrogen oxides (NOx) emissions. The causes of this increase in NOx and solutions to this problem have been the subjects of research for considerable time. In the Internal Combustion Engine, at high temperature, oxidation of nitrogen takes place and a significant amount of NOx will be formed at the end of combustion. The majority of NOx formed will however decompose at the low temperatures of exhaust. But due to very low reaction rate at the exhaust temperature, a part of NOx formed remains in exhaust. It is fair in excess of the equilibrium composition at that temperature though the formation of NOx freezes at low exhaust temperature. Experimentation in this area with a new approach using Cetane improvers for NOx reduction from biodiesel would increase the basic fuel properties of biodiesel. Perhaps the most practical strategy for NOx reduction in the short term is the use of Cetane improvers. This is because, some additives caused an increase in Particulate emission which may severely limit the marketability of biodiesel, and hence the Cetane enhancers are the choices for experimentation in reducing NOx emissions, and at the same time with the use of some anti-oxidants basic quality of fuel could be enhanced for biodiesels.