EXPERIMENTAL INVESTIGATION OF MARINE ENGINE EXHAUST EMISSIONS

Abstract

ABSTRACT The physicochemical process of formation of the four main pollutant emissions from diesel engines (carbon monoxide-CO, hydrocarbons-HC, particulate matter-PM and nitrogen oxides-NOx), quantities of produced exhaust emissions and their harmful impact are some of the most important factors for the establishment of stricter emission regulations and for improvement of marine engines. In this paper, the conducted experiment and analysis of exhaust emissions are explained. Experimental research provided on a four stroke main engine during a typical voyage of the ship shows that the quantity of NOx emissions is 3.42 g/kWh, which is lower than the permissible limit of 11.75 g/kWh. The engine complies with the International Maritime Organization (IMO) Class II emission limits; however, it does not comply with Class III emission limits. The results show that depending on the different operating conditions the concentration of CO2 in exhaust gases varies from 3,2% to 6,6%, the content of CO varies from 170 ppm to 233 ppm and NO varies from 690 ppm to 1120 ppm. The necessity of implementing an onboard emission measurement method is emphasized. Recommendations are given on the possibility of improving the performance of the analyzed engine system.