Effect of natural antioxidant additive on hydrogen-enriched biodiesel operated compression ignition engine

Abstract

The environmental degradation and depletion of fossil fuel, urges the need of renewable fuel for IC engines. Among the renewable fuel, biodiesel are widely used as alternative fuel but for recent years hydrogen is also considered as alternative fuel because of zero emission but it possess higher auto ignition temperature. In order to reduce the self-ignition temperature of hydrogen and another liquid fuel is mixed and operated as a dual fuel mode condition in CI engine. The current investigation aims to analyse the impact of natural antioxidant additive on hydrogen-enriched biodiesel operation in a diesel engine. During the experimentation process hydrogen is admitted at the intake manifold and B20 blend of juliflora biodiesel is injected in combustion cylinder. The three test fuel samples are used for the experimentation process such as diesel, B20 and B20 with hydrogen in different flow rates such as 8, 10, 12, 16,20lpm. B20 with hydrogen shows an increment of brake thermal efficiency (BTE). Among the test fuels B20 + 16lpm and B20 + 20lpm blends have better improvement of BTE of 28.815% and 28.32%, which is higher than the conventional engine at maximum load CO, HC emission is also lower for B20 + 16lpm and B20 + 20lpm than other blends but the NOx emission increases of 26 and 28% than diesel respectively. In order to minimize the NOx emission, natural antioxidant additive Melia Azedarach (MA) of 1000 ppm is added to B20 + 16lpm and found that B20 + 16lpm with MA shows an improvement of BTE 2.17% higher than B20 + 16lpm without additive and the NOx emission for B20 + 16lpm with additive is 1079 ppm, which is 21.9% lower than B20 + 16lpm without additives. Therefore B20 + 16lpm with additive is superior than other test blends.