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Energies 2016, 9(4), 304;

Decreasing NOx of a Low-Speed Two-Stroke Marine Diesel Engine by Using In-Cylinder Emission Control Measures

Institute of Internal Combustion Engine, Dalian University of Technology, Dalian 116024, China
Author to whom correspondence should be addressed.
Academic Editor: Antonio Ficarella
Received: 29 February 2016 / Revised: 8 April 2016 / Accepted: 15 April 2016 / Published: 21 April 2016
(This article belongs to the Special Issue Combustion and Propulsion)
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The authors applied one-dimensional (1-D) simulation and 3-D Computational Fluid Dynamics (CFD) simulation to evaluate the potential of in-cylinder control methods on a low-speed 2-stroke marine engine to reach the International Maritime Organization (IMO) Tier 3 NOx emissions standards. Reducing the combustion temperature is an important in-cylinder measure to decrease NOx emissions of marine diesel engines. Miller-cycle and Exhaust Gas Recirculation (EGR) are effective methods to reduce the maximum combustion temperature and accordingly decrease NOx emissions. The authors’ calculation results indicate that with a combination of 2-stage turbocharging, a mild Miller-cycle and 10% EGR rate, the NOx emissions can be decreased by 48% without the increased Specific Fuel Oil Consumption (SFOC) penalties; with a medium Miller-cycle and 10% EGR, NOx can be decreased by 56% with a slight increase of SFOC; with a medium Miller-cycle and 20% EGR, NOx can be decreased by 77% and meet IMO Tier 3 standards, but with the high price of a considerable increase of SFOC. The first two schemes are promising to meet IMO Tier 3 standards with good fuel economy if other techniques are combined. View Full-Text
Keywords: 2-stroke marine diesel engine; combustion; emissions; Miller-cycle; EGR 2-stroke marine diesel engine; combustion; emissions; Miller-cycle; EGR

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Feng, L.; Tian, J.; Long, W.; Gong, W.; Du, B.; Li, D.; Chen, L. Decreasing NOx of a Low-Speed Two-Stroke Marine Diesel Engine by Using In-Cylinder Emission Control Measures. Energies 2016, 9, 304.

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