Investigation of Harmful Chemical Compounds from Dual-Fuelled Diesel Engine
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Latvia University of Life Sciences and Technologies
Kazimierz Pulaski University of Technology and Humanities in Radom, Faculty of Mechanical Engineering
Technology and Design, Kazimierz Pulaski University of Technology and Humanities in Radom, Faculty of Material Science
Military Institute of Automotive and Armor Technology
Publication date: 2020-12-01
Corresponding author
Ruslans Smigins   

Latvia University of Life Sciences and Technologies
Adv. Sci. Technol. Res. J. 2020; 14(4):21-29
This paper investigates an impact of the exhaust gas recirculation on concentration of selected harmful chemical compounds from the AVL 5402 research diesel engine powered with diesel fuel (DF) and compressed natural gas (CNG). In particular the engine was operated in the dual fuel mode. It means that the engine was conventionally fuelled by regular diesel fuel and simultaneously by CNG dosed into the inlet pipe. Necessary tests were carried out for mixtures containing 30, 50 and 70 % by energy content of CNG in the total chemical energy delivered with diesel fuel (DF) into the combustion chamber. Research was conducted for stationary conditions of the engine work at 1200 rpm and constant 1004 Joules of a fuel chemical energy delivered in each cycle into the combustion chamber. In such conditions an impact of the EGR rate changed in range of 0 – 50 % on emissions of selected unburned hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) as well as particulate matter (PM) was evaluated. Obtained results confirmed that the EGR system is effective in reduction of NOx formation for all tested fuel mixtures. Nevertheless, it was found that addition of CNG combusted in the diesel engine generates more harmful pollutants in comparison with diesel fuel. However, in some cases the concentration of NOx as well as PM was comparable or lower. It suggests that combustion of CNG in diesels allows to achieve environmental benefits. In this case further optimization of engine fuel supply system is necessary.
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