Abstract
In the present work, an attempt was made to reduce the NO<sub><i>x<i/><sub/> emission of crude rice bran oil methyl ester without any considerable increase in smoke density, when used as a fuel in a stationary CI engine. Three factors namely, fuel injection timing, Exhaust Gas Recirculation (EGR) and fuel injection pressure were chosen and their combined effect in controlling the NO<sub><i>x<i/><sub/> emission of a stationary Diesel engine fuelled with crude rice bran oil methyl ester was investigated. Three levels were chosen in each factor and NO<sub><i>x<i/><sub/> emission, smoke density and brake thermal efficiency were taken as the response variables. Experiments were designed by employing design of experiments method and Taguchi’s L<sub>9<sub/> orthogonal array was used to conduct the engine tests with different levels of the chosen factors. Multi Response Signal-to-Noise ratio (MRSN) was calculated for the response variables and the optimum combination level of factors was obtained simultaneously using Taguchi’s parametric design. Confirmation experiment was conducted for the obtained optimum combination level of factors and the results were compared with normal operating conditions and significant improvement was observed in the response variables.
Highlights
Significant work have been carried out to use bioDiesel as an alternate fuel in Diesel engine in the last two decades [1,2,3,4,5,6,7,8]
These results indicate that to reduce Nitrogen oxide (NOx) emissions without considerable increase in smoke emission, the retardation angle and percentage Exhaust Gas Recirculation (EGR) should be optimized
This work explores the possibility of utilizing Design of Experiments (DOE) and Taguchi orthogonal array in engine testing and attempts to investigate the combined effect of three factors on the three variables with minimum number of experimental work
Summary
Significant work have been carried out to use bioDiesel as an alternate fuel in Diesel engine in the last two decades [1,2,3,4,5,6,7,8]. NOx emission in a Diesel engine can be controlled either by modification of the combustion process or by the treatment of exhaust gases [14] In the former method retardation of fuel injection timing, Exhaust Gas Recirculation (EGR), fuel additives and water injection techniques are employed to prevent the NOx formation [15] while the latter method was carried out with the help of different catalysts to remove NOx emission completely [16,17,18,19,20]. Several attempts were made to reduce the NOx emission of Diesel engines fuelled with bioDiesel by employing fuel injection retardation and EGR [21,22,23,24,25,26,27] These methods result in decrease in brake thermal efficiency and increase in smoke density. These results indicate that to reduce NOx emissions without considerable increase in smoke emission, the retardation angle and percentage EGR should be optimized
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