Abstract
The emission of SO2 from ships is an important source of atmospheric pollution. Therefore, the International Maritime Organization (IMO) has established strict requirements for the sulfur content of marine fuel oil. In this paper, a new optical noncontact detection technique for ship exhaust emissions analysis is studied. Firstly, the single-band simulation analysis model of the imaging detection technology for SO2 concentration in ship exhaust gas and the deep neural network model for the prediction of sulfur content were established. A bench test was designed to monitor the tail gas concentration simultaneously using online and imaging detection methods, so as to obtain the concentration data in the flue and the ultraviolet image data. The results showed that 300 nm had a higher inversion accuracy than the other two bands. Finally, a deep neural network model was trained with the SO2 concentration data from the inversion and the engine power, and the predictive model of sulfur content in marine fuel oil was thereby obtained. When the deep learning model was used to predict sulfur content, the prediction accuracy at 300, 310, and 330 nm was 73%, 94%, and 71%, respectively.
Highlights
With the unstoppable tide of economic globalization and the advent of the 21st-century “Maritime Silk Road”, shipping has become the most important mode of transportation in global trade due to its large cargo volume and low freight, providing a strong guarantee for the rapid and steady development of the global economy [1]
Since the 1980s, the Maritime Environmental Protection Committee (MEPC) of the International Maritime Organization (IMO) has been committed to improving the problem of exhaust pollution caused by ships
The results showed that 310 nm UV could be used to predict fuel sulfur content with the highest accuracy, reaching 94%
Summary
With the unstoppable tide of economic globalization and the advent of the 21st-century “Maritime Silk Road”, shipping has become the most important mode of transportation in global trade due to its large cargo volume and low freight, providing a strong guarantee for the rapid and steady development of the global economy [1]. Since the 1980s, the Maritime Environmental Protection Committee (MEPC) of the International Maritime Organization (IMO) has been committed to improving the problem of exhaust pollution caused by ships. 70% of the exhaust gas is discharged into the maritime atmosphere less than 400 km away from land, which causes serious air pollution in coastal areas, especially around the ports with heavy cargo traffic [5,6,7,8,9]. The proportion of ship exhaust emissions in global total air pollutant emissions is increasing every year, partly due to shipping trade growth, but mainly because other industries have implemented better regulatory measures that have effectively reduced the emissions of land-based exhaust pollutants
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