PERFORMANCE EVALUATION, EMISSION CHARACTERISTICS AND ECONOMIC ANALYSIS OF FOUR NON-EDIBLE STRAIGHT VEGETABLE OILS ON A SINGLE CYLINDER CI ENGINE

An experimental investigation has been carried out to analyze the performance and emission characteristics of a compression ignition engine fuelled with non-edible straight vegetable oils of Neem, Mahua, Linseed and Castor oil. Straight vegetable oils posed operational and durability problems when subjected to long term usage in CI engine. These problems are attributed to high viscosity, low volatility and polyunsaturated character of vegetable oils. Hence, process of transesterification is found to be effective method of reducing viscosity and eliminating operational and durability problems. Fuel preheating in the experiments for reducing viscosity of neat oils has also been done by a specially designed heat exchanger, which utilizes waste heat from exhaust gases. The test is conducted on single cylinder DI engine at constant speed of 1500 rpm. The performance parameters evaluated include thermal efficiency, brake specific fuel consumption (BSFC), brake specific energy consumption (BSEC), and exhaust gas temperature whereas exhaust emissions include mass emissions smoke. The results of the experiment in each case were compared with baseline data of diesel. Significant improvements have been observed in the performance parameters of the engine as well as exhaust emissions with use of neem, mahua and castor oil. Economic analysis was also done in the study and it is found that use of vegetable oil as diesel fuel substitutes has almost similar cost as that of mineral diesel.

[1]  Carlos R. P. Belchior,et al.  Performance of a diesel generator fuelled with palm oil , 2002 .

[2]  M. P. Dorado,et al.  An approach to the economics of two vegetable oil-based biofuels in Spain , 2006 .

[3]  Ayhan Demirbas,et al.  Progress and recent trends in biofuels , 2007 .

[4]  O. M. I. Nwafor,et al.  The effect of elevated fuel inlet temperature on performance of diesel engine running on neat vegetable oil at constant speed conditions , 2003 .

[5]  T. W. Ryan,et al.  The effects of vegetable oil properties on injection and combustion in two different diesel engines , 1984 .

[6]  van Jmn Han Kasteren,et al.  A process model to estimate the cost of industrial scale biodiesel production from waste cooking oil by supercritical transesterification , 2007 .

[7]  K. Pramanik.  Properties and use of jatropha curcas oil and diesel fuel blends in compression ignition engine , 2003 .

[8]  A. McAloon,et al.  A process model to estimate biodiesel production costs. , 2006, Bioresource technology.

[9]  G. R. Quick,et al.  Developments in use of vegetable oils as fuel for diesel engines. , 1980 .

[10]  Dimitrios C. Rakopoulos,et al.  Comparative performance and emissions study of a direct injection Diesel engine using blends of Diesel fuel with vegetable oils or bio-diesels of various origins , 2006 .

[11]  A. Shaheed,et al.  Combustion analysis of coconut oil and its methyl esters in a diesel engine , 1999 .

[12]  Charles S. Wassell,et al.  Are subsidies for biodiesel economically efficient , 2006 .

[13]  Haji Hassan Masjuki,et al.  Investigations on Preheated Palm Oil Methyl Esters in the Diesel Engine , 1996 .

[14]  Vegetable oil as diesel fuel? , 1980 .

[15]  L. C. Meher,et al.  Methanolysis of Pongamia pinnata (karanja) oil for production of biodiesel , 2004 .

[16]  S. Bari,et al.  Effects of preheating of crude palm oil (CPO) on injection system, performance and emission of a diesel engine , 2002 .

[17]  A. Ramesh,et al.  An experimental comparison of methods to use methanol and Jatropha oil in a compression ignition engine , 2003 .