Emission Characteristics of a Diesel Engine Fuelled with Preheated Vegetable Oil and Biodiesel

Anh Tuan Hoang* and Van Thu Nguyen

Faculty of Mechanical Engineering, Ho Chi Minh University of Transport
No. 2, D3 Road, Ward 25, Binh Thanh District, Ho Chi Minh City, Vietnam

*Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.


Currently, there are many studies carried out aimed at finding alternative fuels. These renewable resources are potentially useful for the environment since they could replace the depleting fossil fuels. The emission characteristics of diesel engine fueled with diesel oil (DO), biodiesel from Jatropha oil (JOME), and preheated coconut oil (PCO) were used for comparative analysis. The fuels were tested at full load and different revolution, from 1000 rpm to 2000 rpm of engine speed. The exhaust gas temperature (Tex) and emission parameters such as carbon monoxide (CO), unburnt hydrocarbons (HCs), smoke, and oxides of nitrogen (NOx) were measured and compared. Results showed that, relative to diesel fuel, the CO and HC emissions were higher in the case of using preheated coconut oil and lower in the case of using JOME. The NOx emissions were also seen higher for JOME and lower for PCO in comparison with DO. Findings of this paper denote that JOME and preheated coconut oil up to 100° C (PCO_t100) can be considered as fuels for diesel engines.


Currently, air pollution is ruining massively our life, environment, and health, as speedy depletion of fossil fuels is occurring and energy demands are ever increasing. These urgent matters require us to find the alternative fuels that would satisfy our energy demands and provide sustainable and maximum benefits for the environment. The use of fossil fuels for transportation (e.g., car, motorcycle, airplane, ship, and train) causes most of the air pollution. Hence, manufacturers have designed and fabricated engines that can run on various alternative fuels and satisfy regulatory emission limits. Many past and ongoing studies worldwide – even in many developing countries – have sought to evaluate the performance of existing engines in terms of power, moment, specific fuel consumption (SFC), exhaust emission, and combustion characteristics. Alternative fuels explored for use by internal combustion engines (ICE) include alcohols, liquefied petroleum gas (LPG), biogas, biodiesels, preheated vegetable oil, hydrogen, compressed natural gas (CNG), bio-ethanol, bio-methanol, dimethyl ether (DME), diethyl ether (DEE), and fossil fuel blends. Several researchers have concluded that biodiesel and preheated vegetable oils hold highly promising potential when used as alternative fuels in ICEs if their properties are improved to the same level as those of diesel fueL . . . . read more


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