Abstract
The vast majority of ships trafficking the oceans are fuelled by residual oil with sulphur high content, which produces sulphur oxides (SOx) when combusted. Additionally, the high pressures and temperatures in modern diesel engines also produce nitrogen oxides (NOx). These emissions are both a hazard to health and the local environment, and regulations enforced by the International Maritime Organization (IMO) are driving the maritime sector towards the use of either distillate fuels containing less sulphur, or the use of exhaust gas cleaning devices. Two common techniques for removing SOx and limiting NOx are the open loop wet scrubber and exhaust gas recirculation (EGR). A scrubber and EGR installation reduces the overall efficiency of the system as it needs significant pumping power, which means that the exhaust gases are cleaner but at the expense of higher CO2 emissions. In this paper we propose a method to integrate an exhaust gas cleaning device for both NOx and SOx with an organic Rankine cycle for Waste Heat Recovery (WHR), thereby enhancing the system efficiency. We investigate three ORC configurations, integrated with the energy flows from both an existing state-of-the-art EGR system and an additional open loop wet scrubber.
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Acknowledgments
We would like to acknowledge MAN Diesel & Turbo for providing us with engine data. Acknowledgments also go to the Swedish Maritime Administration and Lund University for funding.
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Ahlgren, F., Thern, M., Genrup, M., Mondejar, M.E. (2018). Energy Integration of Organic Rankine Cycle, Exhaust Gas Recirculation and Scrubber. In: Ölçer, A., Kitada, M., Dalaklis, D., Ballini, F. (eds) Trends and Challenges in Maritime Energy Management. WMU Studies in Maritime Affairs, vol 6. Springer, Cham. https://doi.org/10.1007/978-3-319-74576-3_12
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DOI: https://doi.org/10.1007/978-3-319-74576-3_12
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