Journal of Food, Agriculture and Environment
Vol 10,
Issue 2,2012
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Use of waste cooking oil biodiesel in a tractor DI diesel engine
Author(s):
Arash Mohebbi 1*,
Mohammad Hassan Komarizade 1, Samad Jafarmadar 2, Jafar Pashai 3Recieved Date: 2011-12-06, Accepted Date: 2012-04-26
Abstract:Due to using of fossil fuels, the world today is faced with serious environmental pollution. However, these fuels are limited and depleting day by day as the consumption is increasing very rapidly. Hence, it is necessary to find out a clean alternative fuel produced from renewable sources. Biodiesel is an alternative fuel that can be used directly in diesel engine as pure or blended with diesel fuel. In this study, the effects of biodiesel produced from waste cooking oil (WCO) and its different blends with diesel fuel on the tractor diesel engine torque and power, oxides of nitrogen (NOx) and particulate matter (PM) emissions, brake specific fuel consumption (BSFC), brake thermal efficiency, cylinder pressure and hear release rate are analysed and presented. Use of WCO biodiesel results in advanced start of injection, advanced combustion process, shorter ignition delay and increased heat release rate. Thus, higher cylinder peak pressure and temperature lead to increase NOx while PM is reduced. Although, the increase of the WCO percentage in the fuel blend reduces the engine torque and power, the results show some torque and power recovery for this reduction. The lower heating value of WCO results in increased BSFC but the engine brake thermal efficiency is not affected significantly. Exhaust gas recirculation (EGR) is an effective technique for reducing NOx emissions when using biodiesel-diesel fuel blends. When same percentage of EGR are used in the cases of diesel and WCO, NOx emissions are reduced to similar values, but the PM emissions are significantly lower in the case of WCO biodiesel. Thus, biodiesel with EGR can be used to reduce NOx and PM emissions simultaneously. The brake thermal efficiency obtained with WCO biodiesels is higher than that of diesel fuel when applying same EGR rate. Similarly, the reduction of engine torque and increase of BSFC are lower with WCO biodiesels with respect to diesel fuel. Thus, EGR has lower negative effect on engine performance in case of WCO biodiesels compared to diesel fuel.
Keywords:Waste cooking oil biodiesel,
diesel engine, emissions, combustion, EGRJournal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Environment
Pages: 1290-1297
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