Abstract
To meet energy demand as well as emission regulations of today’s world moved the researchers towards the use of alternative fuels such as alcohols, biofuels in CI engine. Present work is to examine the performance and emission characteristics of fumigated butanol on a duel fuel mode HCCI engine. Experiments were performed for n-butanol fumigation (nBF) at constant speed 1500rpm with fixed mass flow rate under varying engine loads at compression ratio 17.5:1 and injection pressure 210 bar. Obtained test results showed that the mechanical efficiency increased by 7-8%, brake thermal efficiency increased by 7-13%, specific fuel consumption decreased by 4-10%. Emissions like smoke, oxides of nitrogen decreased significantly however carbon monoxide & hydrocarbons increased compared to diesel fuel. Finally, it is concluded that nBF method is best suitable for CI engines at medium engine loads for better engine efficiency and less smoke and NOx emissions.
Highlights
Diesel vehicles are major sources for harmful emissions causing environmental pollution and badly effecting human health
Experiment was conducted by using fumigated butanol at different engine load conditions with constant mass flow rate 1 kg/hr and fixed speed 1500 RPM
Mechanical efficiency : Mechanical efficiency increased by 8%, 8%, 9%, 6% at 1⁄4 load, 1⁄2 load, 3⁄4 load, full load in butanol fumigation process equated to diesel fuel
Summary
Diesel vehicles are major sources for harmful emissions causing environmental pollution and badly effecting human health. Because of rapid increase in urbanization and industrialization supply of fossil fuel reserves are depleting and increasing price. This forced the need for searching alternative fuels with low emissions and to meet rising energy demand with safe emission range. Various studies were conducted on alternative fuels in CI Engine, by four different methods including (1) blending (2) fumigation (3) duel fuel (4) direct usage. Among these blending & fumigation are preferred for optimum results. Because of low cetane number and heterogeneous mixing with diesel, additives are employed.Fumigation of fuels is another method, used for alternative fuels in CI engine. With help of a carburetor alcohol fuel is added to the intake air during suction stroke, with a slight modification at the air intake system of the engine
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