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Exergy analysis of fusel oil as an alternative fuel additive for spark ignition engines
(Taylor & Francis Ltd, 2023) Ustun, Suleyman; Dogan, Battal; Erol, Dervis
The present study conducted performance and exhaust emission tests of fuel blends prepared using gasoline and waste fusel oil at full load and different engine speeds in a spark-ignition engine. Additionally, energy, exergy, and exergoeconomic analyses were carried out using engine performance and exhaust emission values. In engine tests, the highest brake specific fuel consumption obtained was 433.12 g/kWh in F50 fuel at an engine speed of 3500 rpm. The brake specific fuel consumption of G100 fuel was 364.46 g/kWh at the same engine speed. Adding waste fusel oil into fuel blends was observed to reduce carbon monoxide, unburned hydrocarbon , and nitrogen oxide emissions. According to the thermodynamic analysis results, an increase in the ratio of fusel oil in fuel blends reduces thermal efficiency and exergy efficiency. The ratio of fusel oil in fuel blends positively affects exergy destruction. The lowest exergy destruction was calculated as 16.47 kW in F50 fuel at an engine speed of 1500 rpm. As the fusel oil ratio in fuel blends increases, the unit cost of exergy of useful work of the fuel blends decreases. The lowest cost is 6.195 $/GJ at 1500 rpm in F50 fuel. The low pump price of waste fusel oil indicates its advantages over gasoline in exergoeconomic analysis results.