Abstract
Effort towards prospective utilization of dairy waste scum oil methyl ester (DSOME) is extremely pronounced as a promising sustainable unconventional fuel for diesel engine as they have intrinsic oxygen content emits less HC and CO emission and contradictorily increases the NOx. In this regard, the present study elucidates the influence of engine exhaust gas recirculation (EGR) on diesel engine performance, combustion and emission characteristics operated with DSOME-B20 (20% dairy scum biodiesel, by volume). The brake thermal efficiency (BTE) and brake specific fuel consumption (BSFC) are appreciably improved for 5% and 10% EGR in comparison with 15% EGR rate. Mainly, about 49-57% of NOx can be reduced with 5-15% EGR rate but increasing EGR rate more than 10% dilutes the fresh intake air hence reduces the NOx and increases the HC, CO emissions. Hence use of 5-10% EGR in diesel engine is advantageous to get considerably improved performance and reduced HC, CO and NOx emissions.
Highlights
Diesel engines are reliable, cost effectiveness and greater efficient since extensively used, whereas they generate harmful NOx and soot emissions
It could be attributed to introduction of more exhaust gas recirculation (EGR) into the combustion chamber leading to reduction in the amount of the air and dairy waste scum oil methyl ester (DSOME)-B20 fuel, since more dilution effect reduces the heat release rate (HRR) and cylinder pressure causing the incomplete combustion
The diesel fuel has higher brake thermal efficiency (BTE) for entire load range when compared to other EGR concentrations; this could be attributed to superior calorific value and lower viscosity of diesel
Summary
Cost effectiveness and greater efficient since extensively used, whereas they generate harmful NOx and soot emissions. Diethyl ether (DEE), ethanol and methanol blending with petroleum diesel would reduce the HC, CO and soot emissions (Srihari et al, 2017). Different sources of biofuel production are available, among which activated sludge which is enriched with the nutrient such as nitrification-involved process which could be a viable source for biofuel generation (Sepehri and Sarrafzadeh, 2018). In this aspect, dairy waste water can be used to produce the biodiesel. Production cost and disposal problem can be reduced by producing biodiesel from dairy waste scum as the waste scum is available freely and abundantly in the milk dairies. The properties of dairy waste scum biodiesel are within ASTM limits it is promising substitute to the conventional diesel (Sivakumar et al, 2011; Yatish et al, 2016; Srikanth et al, 2017)
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