The synergetic effect between hydrogen addition and EGR on cashew nut shell liquid biofuel-diesel operated engine. (15th April 2020) - Loganathan, M.
Abstract: Bio fuel extracted from Cashew Nut Shell is a promising, low cost and renewable alternative that produce low emissions. In this work a mixture of diesel-cashew nut shell biofuel was supplemented with hydrogen to enhance combustion while at the same time, reduce the hydrocarbon and carbon monoxide emissions. In an attempt to reduce the oxides of nitrogen, the exhaust gas circulation was attempted at 10%. The experiment is conducted in a single cylinder, 1500 rpm diesel engine. The load tests revealed that the hydrogen enriched biofuel with exhaust gas recirculation enhanced the thermal efficiency and simultaneously reduced the emission of carbon monoxide, hydrocarbons and oxides of nitrogen. The thermal efficiency in hydrogen enriched biofuel dual fuel engine got increased from 31% to 36.5% when compared with biofuel mode. Further, the hydrocarbon and carbon monoxide reductions were reported at 20% and 10% respectively at full load. But the 40% increase in nitrogen oxides emission was observed in hydrogen-enriched biofuel engine. In exhaust gas circulation mode, there is a reduction of 26% nitrogen oxides emission was observed at 30% exhaust gas circulation with hydrogen-enriched biofuel mode. There was an increase in both in-cylinder pressure and heat release rate for hydrogen-enriched biofuel dual fuel mode, but it got decreased in exhaust gas circulation mode. Finally, the optimum combination of 10% exhaust gas circulation, 6lpm hydrogen flow rate and 20% biofuel led to the diminished levels of nitrogen oxides with mild upsurge in hydrocarbon and carbon monoxide and brake specific fuel consumption.