A Simulation Study to Assess the Economic, Energy and Emissions Characteristics of a Marine Engine Equipped with Exhaust Gas Recirculation

摘要

Ships are a significant source of pollution to the environment, especially in port and coastal cities because they use poor quality mineral fuels, have very high emissions such as a nitrous oxide (NOx), sulfur dioxide (SO_2). As an indisputable fact, the combustion of the mixture of fuel and air in the combustion chamber is always accompanied by the oxidation of nitrogen; nitrogen oxide products will always accompany the combustion product. The International Maritime Organization (IMO) is increasingly tightening emission regulations with shipping fleets, especially NOx emissions. For marine diesel engines, the NOx emission limit is set by Article 13 of Annex VI of MARPOL 73/78 and takes effect as of January 1, 2000. There are many solutions to reduce NOx emissions at the generating source,such as reducing early injection timing, exhaust air recirculation, water injection into the cylinder, ... NOx adjustment solutions for diesel engines have been applied since MARPOL Article 13 came into effect. These solutions can be achieved by increasing the compression ratio,slowing the injection delay,and modifying the distribution phase of the exhaust. Emission circulation is a technique used to reduce emissions of nitrous oxide (NOx) on various types of marine engines. This EGR emissions system is used in conjunction with other emission control devices, such as exhaust catalytic converters to help minimize environmental emissions from marine engines. The paper presents the results of evaluating the effect of exhaust gas recirculation on the economic, energy,and environmental criteria of marine diesel engine 6CHHSP 18/22-600 through a work cycle simulation model built into dedicated AVL-Boost software.