Determination of optimal operating modes of the selective catalytic reduction system for marine diesel exhaust gases

Authors

DOI:

https://doi.org/10.15587/2706-5448.2025.340411

Keywords:

environmental indicators, maritime transport, exhaust gas purification, marine diesel, catalytic reduction system

Abstract

The object of research is the process of ensuring the minimum level of carbon dioxide emissions when using selective catalytic reduction of exhaust gases from nitrogen oxides. It is noted that catalytic reduction systems provide the most effective purification of exhaust gases from nitrogen oxides. At the same time, due to the use of urea as a reagent in these systems, carbon dioxide emissions increase. This increases the greenhouse effect and reduces the energy efficiency of the ship. The research results presented in the work were carried out on a Gas Carrier class ship with a displacement of 127,645 tons with two main engines 5X72DF Hyundai-WinGD and three auxiliary engines 6H35DF Hyundai-HiMSEN. 5X72DF Hyundai-WinGD diesel engines were equipped with a high-pressure catalytic reduction system, 6H35DF Hyundai-HiMSEN diesel engines – with a low-pressure catalytic reduction system. It has been experimentally established that within the recommended range of urea supply to the catalytic reduction system of exhaust gases, there are optimal modes that ensure a minimal increase in carbon dioxide emissions while maintaining a high level of reduction in nitrogen oxide emissions. In these modes, the relative increase in carbon dioxide emissions does not exceed 2.3% for both types of diesel engines. Nitrogen oxide emissions for 5X72DF Hyundai-WinGD diesel engines do not exceed 3.3 g/(kW   h) and do not exceed 2.4 g/(kW   h) for 6H35DF Hyundai-HiMSEN diesel engines, which meets the requirements of Annex VI MARPOL. The relative reduction in nitrogen oxide emissions in these modes is 66.7–83.4% for 5X72DF Hyundai-WinGD diesel engines and 60.8–78.3% for 6H35DF Hyundai-HiMSEN diesel engines. The coincidence of the obtained values for the low-speed diesel engine 5X72DF Hyundai-WinGD and the medium-speed 6H35DF Hyundai-HiMSEN indicates the correctness of the research and the possibility of implementing their results on all types of diesel engines and catalytic reduction systems.

Author Biographies

Sergii Sagin, National University “Odessa Maritime Academy”

Doctor of Technical Sciences, Professor, Head of Department

Department of Ship Power Plant

Oleksiy Kuropyatnyk, National University “Odessa Maritime Academy”

PhD

Department of Ship Power Plant

 

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Determination of optimal operating modes of the selective catalytic reduction system for marine diesel exhaust gases

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2025-10-30

How to Cite

Sagin, S., & Kuropyatnyk, O. (2025). Determination of optimal operating modes of the selective catalytic reduction system for marine diesel exhaust gases. Technology Audit and Production Reserves, 5(3(85), 12–22. https://doi.org/10.15587/2706-5448.2025.340411

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Vol. 5 No. 3(85) (2025): Chemical engineering

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Ecology and Environmental Technology

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Copyright (c) 2025 Sergii Sagin, Oleksiy Kuropyatnyk

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