TECHNICAL SUPPORT FOR SHIP POWER PLANTS COMPLIANCE WITH THE NEW REQUIREMENTS FOR NITROGEN OXIDE EMISSIONS IN 2021

It is expected that since 2021, at the initiative of the International Maritime organization, the control zones for nitrogen oxide emissions in the exhaust gases of ship power plants will be expanded to cover the regions of the Baltic and North Seas. In such circumstances, shipowners operating in these regions, at the stages of modernization and construction of new ships inevitably face the problem of choosing a way to meet the new requirements. The following variants of compliance are considered: selective catalytic reduction of nitrogen oxides; application of exhaust gas recirculation system; use of alternative fuels, as well as a number of technical solutions related to the direct impact on the working process of the engine, aimed at reducing the emission of nitrogen oxides. It is noted that the consideration of various technologies to meet the new requirements and analysis of their advantages and disadvantages will create prerequisites for the choice of the concept and the way to achieve the requirements of the environmental standard TIER III, used in emission control zones. Attention is drawn to the fact that in order to achieve the requirements of the TIER III standard, first of all, the systems of selective catalytic recovery and exhaust gas recirculation are considered as the most proven technologies. In conclusion, it is noted that ensuring the environmental requirements of the TIER III standard for a wide range of operating modes of the ship’s power plant is a complex task, the solution of which can be achieved during the engine design by the simultaneous implementation of various technologies to reduce NOx emissions. The increased demand for TIER III engines can be expected to provide additional motivation for manufacturers to find and implement new design solutions aimed at reducing the content of nitrogen oxides in exhaust gases, as well as to refine and make more extensive use of already known methods to combat NOx emissions.

marine power plant, environmental safety, IMO requirements, NOx emission, control zones, compliance methods, selective catalytic reduction, exhaust gas recirculation, alternative fuels, choice of option

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