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Multi-objective optimization of diesel engine performance and emissions fueled with diesel-biodiesel-fusel oil blends using response surface method

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Abstract

The interest in research on alcohol-based biofuels is on the rise. Fusel oil is a long-chain alcohol and a by-product of bioethanol synthesis. This study analyzed the effects of blended levels of fusel oil and biodiesel in diesel fuel on the performance and exhaust emissions of a single-cylinder diesel engine. The effects of input parameters (i.e., fusel oil content (%), biodiesel content (%), engine speed (rpm), and engine load (%), each at five levels) on response parameters (i.e., power, torque, fuel consumption, and emission factors, namely NOX, UHC, CO, and CO2) were investigated. Different levels were used for analyzing fusel oil (0, 5, 10, 15, and 20%), biodiesel (0, 5, 10, 15, and 20%), engine load (0, 25, 50, 75, and 100%), and engine speed (1400, 1700, 2000, 2300, and 2600 rpm). Response surface method (RSM) was employed to maximize engine performance and minimize exhaust emissions. A blend of D90F5 B5 (5% fusel oil, 5% biodiesel, and 90% petro-diesel) and engine speed of 2026 rpm at load 46% were predicted to be an optimal value. Using a 72% desirability function, optimum results for torque (14.2 Nm), power (3.37 kW), and brake-specific fuel consumption (356.9 g/kWh) were also obtained from RSM. Based on the optimized inputs, the optimized values of different output pollutants were 0.14 vol.% for CO, 1.62 vol.% for CO2, 23.7 ppm for UHC, and 85.17 ppm for NOX. The result illustrated that use of fusel oil decreased NOX emissions up to 20%, while UHC and CO emissions increased up to 32% and 22%, respectively. In addition, the use of fusel oil content (up to 10%) in the blended fuels improved the engine power by 5.6%.

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Abbreviations

F100 :

Fusel oil

D100 :

Pure diesel

F20 :

80% gasoline+20% fusel oil

BDE20 :

20% ethanol in diesel and biodiesel blends

DBF:

Diesel+biodiesel+fusel oil

D91B6E3 :

91% diesel+6% biodiesel+3% ethanol

D80B10F10 :

80% diesel+10% biodiesel+10% fusel oil

D90B0F10 :

10 vol% fusel oil blended with diesel

D90B5F5 :

90% diesel+5% fusel oil+5% biodiesel

LTC:

Low-temperature combustion

BSFC:

Brake-specific fuel consumption

DoE:

Design of experiment

NOX :

Nitrogen oxides

UHC:

Unburned hydrocarbons

CO:

Carbon monoxide

CO2 :

Carbon dioxide

RSM:

Response surface method

CCD:

Central composite design

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Funding

This study was financially supported by grant no: 970106 of the Biotechnology Development Council of the Islamic Republic of Iran.

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Correspondence to Seyed Mohammad Safieddin Ardebili.

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Responsible editor: Philippe Garrigues

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Hassan Pour, A., Safieddin Ardebili, S.M. & Sheikhdavoodi, M.J. Multi-objective optimization of diesel engine performance and emissions fueled with diesel-biodiesel-fusel oil blends using response surface method. Environ Sci Pollut Res 25, 35429–35439 (2018). https://doi.org/10.1007/s11356-018-3459-z

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  • DOI: https://doi.org/10.1007/s11356-018-3459-z

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