Wet technologies as effective primary solutions in reducing emissions for marine diesel engines
Minh Nhat Nguyen†, Thi Minh Hao Dong‡, Van Viet Pham‡, Tri Hieu Le‡,*
† Institute of Engineering, Ho Chi Minh City University of Technology (HUTECH), Ho Chi Minh city, Vietnam
‡ Institute of Maritime, Ho Chi Minh City University of Transport, Ho Chi Minh city, Vietnam
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Marine diesel engines are one of the main sources of air pollution. Exhaust gases of diesel engines have many different harmful components, especially nitrogen oxides with the general formula NOx. Currently, there are many methods and research directions to limit NOx emissions in diesel engine exhaust, each method has its own strengths and limitations. In order to obtain the efficient energy development with less polluted environment with existing marine diesel engines, continuous efforts have gone into research and development of wet technologies, which have the potential to reduce nitric oxides (NOx) and particulate matter (PM) emissions simultaneously with improved performance level. The main objective of this review is to shed light on the role of typical water addition technologies such as water-in-fuel emulsion, intake air humidification – humid air motor and direct water injection in reducing NOx and PM emissions in marine engines. We have made a comparison of the effectiveness of different methods used to reduce the emission of nitrogen oxides. Advantages and disadvantages of supplying water into the combustion chambers of diesel engines have been shown together with the comparison of the range of changes in their construction.