Studies on a diesel engine fuelled with used transformer oil at different fuel injection nozzle opening pressures

摘要

After prolonged use of transformer oils they become waste and utilised in minor applications. Used transformer oil (UTO) possess physical properties similar to diesel fuel. Earlier investigation reveals that the UTO fuelled in a single cylinder, four stoke, direct injection diesel engine developing 4.4 kW at a rated speed of 1500 rpm at 200 bar standard nozzle opening pressure, gave lower brake thermal efficiency and nitric oxide emission and higher smoke compared to diesel fuel operation. In this investigation, the fuel injector in the same engine was subjected to five different injection nozzle opening pressures (200, 210, 220, 230, 240 and 250). The effect on the performance and emissions of a compression ignition engine were evaluated, compared with standard diesel fuel operation and presented in this paper. Results indicated that UTO at 230 bar fuel nozzle opening pressure gave a better performance with lower emissions than UTO at 200 bar.