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Low-Speed Marine Diesel Engine Modeling for NOx Prediction in Exhaust Gases

1
Faculty of Maritime Studies, University of Split, Ruđera Boškovića 37, 21000 Split, Croatia
2
Natural Science School, Matice Hrvatske 11, 21000 Split, Croatia
3
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, University of Split, Ruđera Boškovića 32, 21000 Split, Croatia
*
Author to whom correspondence should be addressed.
Academic Editor: Constantine D. Rakopoulos
Energies 2021, 14(15), 4442; https://doi.org/10.3390/en14154442
Received: 23 June 2021 / Revised: 15 July 2021 / Accepted: 19 July 2021 / Published: 23 July 2021
Knowing the process of generating exhaust emissions and the determination of influential parameters are important factors in improving two-stroke slow-speed marine engines, particularly for further reductions in fuel consumption and stringent regulations on the limitation of nitrogen oxide emissions. In this article, a model of a marine low-speed two-stroke diesel engine has been developed. Experimental and numerical analyses of the nitrogen monoxide formations were carried out. When measuring the concentration of nitrogen oxides in the exhaust emissions, the amount of nitrogen dioxide (NO2) is usually measured, because nitrogen monoxide is very unstable, and due to the large amount of oxygen in the exhaust gases, it is rapidly converted into nitrogen dioxide and its amount is included in the total emission of nitrogen oxides. In this paper, the most significant parameters for the formation of nitrogen monoxide have been determined. Model validation was performed based on measured combustion pressures, engine power, and concentrations of nitrogen oxides at 50% and 75% of maximum continuous engine load. The possibilities of fuel consumption optimization and reduction in nitrogen monoxide emissions by correcting the injection timing and changing the compression ratio were examined. An engine model was developed, based on measured combustion pressures and scavenging air flow, to be used on board by marine engineers for rapid analyses and determining changes in the concentration of nitrogen oxides in exhaust emissions. The amount of nitrogen oxide in exhaust emissions is influenced by the relevant features described in this paper: fuel injection timing and engine compression ratio. The presented methodology provides a basis for further research about the simultaneous impact of changing the injection timing and compression ratio, exhaust valve opening and closing times, as well as the impact of multiple fuel injection to reduce consumption and maintain exhaust emissions within the permissible limits. View Full-Text
Keywords: combustion stoichiometry; mathematical engine model; fuel injection timing; chemical kinetics; influential engine parameters combustion stoichiometry; mathematical engine model; fuel injection timing; chemical kinetics; influential engine parameters
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MDPI and ACS Style

Lalić, B.; Poljak, A.; Radica, G.; Mišura, A. Low-Speed Marine Diesel Engine Modeling for NOx Prediction in Exhaust Gases. Energies 2021, 14, 4442. https://doi.org/10.3390/en14154442

AMA Style

Lalić B, Poljak A, Radica G, Mišura A. Low-Speed Marine Diesel Engine Modeling for NOx Prediction in Exhaust Gases. Energies. 2021; 14(15):4442. https://doi.org/10.3390/en14154442

Chicago/Turabian Style

Lalić, Branko, Andrijana Poljak, Gojmir Radica, and Antonija Mišura. 2021. "Low-Speed Marine Diesel Engine Modeling for NOx Prediction in Exhaust Gases" Energies 14, no. 15: 4442. https://doi.org/10.3390/en14154442

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