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Comparison and Evaluation of Engine Wear, Performance, NOx Reduction and Nano Particle Emission of Diesel, Karanja and Jatropha Oil Methyl Ester Biodiesel in a Military720kW, heavy duty CIDI Engine Applying EGR with Turbo Charging.
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 14, 2020 by SAE International in United States
Rapid depletion of petroleum crude oil reserves,stringent pollution legislations and global warming, has given us the opportunity to work on bio fuels. Biodiesel can be produced from edible and non-edible vegetable oils,waste bio mass and animal fats.Biodiesel is renewable,bio gradable,sulphur free, non-toxic, oxygenated and green alternative fuel. Karanja and Jatropha oils are non- edible vegetable oils. Karanja and Jatrophaoil methyl ester biodiesel are prepared by transesterification process, using methanol. JOME and KOME have comparable performance with low gaseous emission characteristics, except higher NOx emission, in comparison to mineral diesel fuel. Recent emission legislations also restrict nano particle emission in addition to particulate matter, due to their adverse impact on health.In the present study, performance, combustion and emissions of CO, CO2, UHC, NOx and PM including nano particle emission characteristics, along with engine wear were compared for KOME, JOME and diesel fuels by applying 20% EGR with turbo charging, in a 12 cylinders, 720 kW, 38.8 liters heavy duty CIDI military diesel engine.Both KOME and JOME biodiesel fuel exhibit the ASTM standard properties within acceptable limits. Engine was subjected to 100 hours endurance tests. Lubricating oil samples were drawn from engine after a fixed interval of 20 hours engine run for elemental analysis. Atomic absorption spectroscopy and ferrography test were conducted for metal debris concentration analysis. To test wear of exposed cylinder liner, scanning electron microscopy was conducted.All wear tests were conducted with new set of engine parts for all three test fuels.Metals wear were found lowered (26-33%) for both biodiesel fueled engine. The engine performances were evaluated in terms of power, heat release rates and SFC. Engine performance with both KOME and JOME biodiesel were slightly lower (<4-6%) than diesel fuel. Emissions performance of KOME and JOME were better (30-70%)including 21-24% lower NOx emission along with lower total particulate number concentration,particulate size-number distribution and particle size-surface area distribution, as compared to diesel fuel.