Investigation of Waste Frying Oil as a Green Alternative Fuel: An Approach to Reduce NOx Emission

Abstract

The rapid depletion of fossil fuels and environmental degradation has led search for an alternative fuel. Biodiesel is renewable and environment friendly fuel. Waste frying oil methyl ester is a biodiesel prepared from waste frying oil. It is less expensive than fresh vegetable oil and moreover, it helps solving the environmental problems coupled with disposal of the waste frying oils. Majority of the literature reported comparable performance and considerable reduction in emission except oxides of nitrogen (NOx) from the engine fuelled with Biodiesel. NO(x )emission needs to be control to make Biodiesel more viable alternative fuel. Exhaust gas recirculation (EGR) is a method, involves the re-circulation of the exhaust gases back to the combustion chamber, it reduces the NOx emission by reducing the in-cylinder temperature. The present study involves the use of cooled EGR in a Diesel engine with waste frying oil methyl ester as fuel. The result showed use of waste frying oil methyl ester with cooled EGR reduces the NOx emission considerably.