Abstract
Optimization procedures are required to minimize the amount of fuel consumption and exhaust emissions from marine engines. This study discusses the procedures to optimize the performance of any marine engine implemented in a 0D/1D numerical model in order to achieve lower values of exhaust emissions. From that point, an extension of previous simulation researches is presented to calculate the amount of SOx emissions from two marine diesel engines along their load diagrams based on the percentage of sulfur in the marine fuel used. The variations of SOx emissions are computed in g/kW·h and in parts per million (ppm) as functions of the optimized parameters: brake specific fuel consumption and the amount of air-fuel ratio respectively. Then, a surrogate model-based response surface methodology is used to generate polynomial equations to estimate the amount of SOx emissions as functions of engine speed and load. These developed non-dimensional equations can be further used directly to assess the value of SOx emissions for different percentages of sulfur of the selected or similar engines to be used in different marine applications.
Highlights
Shipping is the most fuel-efficient means of moving freight, where more than 70% of global freight task is to transport by ships
Once the brake specific fuel consumption (BSFC) and air-fuel ratio (AFR) are computed, sulfur oxides (SOx) emissions can be calculated based on the standard amount of sulfur (2.5%S) in diesel fuel or any other values according to the fuel used and compared with the real data measured from the manufacturer or from experimental tests
SOx emissions can be computed in g/kW·h and in ppm using Eqs. (1) and (2) respectively according to the calculated BSFC and AFR
Summary
Shipping is the most fuel-efficient means of moving freight, where more than 70% of global freight task is to transport by ships. An extension of the previous works in this paper discusses the computation of the formation of SOx emissions after optimizing the performance of the two turbocharged four-stroke marine diesel engines fueled with MDO based on the amount of sulfur in the fuel to be further used in different numerical simulations. The results of this computation are important due to the unavailability of the value of SOx emissions along the entire operating conditions of the two engines. In order to present a technological and economic study of the fuel used and to compute the total amount of SOx emissions from ships along their trips in both ECA and non-ECA areas
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