Hybridization of an internal combustion engine with a molten carbonate fuel cell for marine applications

• Published in: Applied energy Vol. 298; p. 117192
• Main Authors: Baccioli, Andrea, Liponi, Angelica, Milewski, Jarosław, Szczęśniak, Arkadiusz, Desideri, Umberto
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.09.2021
• Subjects: Efficiency; Fuel cells; LNG; Marine; Modeling; Piston engine; Marine; LNG; Efficiency; Modeling; Fuel cells; Piston engine
• ISSN: 0306-2619; 1872-9118
• DOI: 10.1016/j.apenergy.2021.117192

•The model of molten carbonate fuel cell was created in ASPEN Hysys environment.•The model of system integration of the MCFC with LNG-based piston engine was created in ASPEN Hysys environment.•Also, the short review of the use of fuel cell in marine application is presented.•The sensitivity analysis of MCFC-piston engine fueled by LNG were generated based of the model. This study presents a proposed hybrid ship propulsion system combining an internal combustion engine and a molten carbonate fuel cell both powered by liquefied natural gas (LNG). Exhaust from the internal combustion engine is used as a CO2 source for cell operation, reducing CO2 emissions. Use of fuel stored at very low temperature requires heat for evaporation purposes. The fuel is used to condense water vapor from the fuel cell exhaust gases, returning the remainder to the fuel cell with the right amount of water. This solution increases the electricity generation efficiency of the fuel cell. We analyzed two different system configurations that differ in the way the anode off-gas is recirculated. In the first, all the unoxidized fuel is recirculated to the anode inlet; in the second, off-gas is joined with engine flue gas, and residual fuel burned in a combustion chamber before being sent to the cathode of the fuel cell, allowing to maintain an optimal CO2:O2 ratio in the cathode flow of the fuel cell. A detailed numerical model of the system including cell operation was created in Aspen Hysys and optimized to maximize the system efficiency. Results showed that in configuration I the efficiency gain is about 4.9% with respect to the traditional engine. In configuration II the efficiency gain was only about 0.8%. We also analyzed the sensitivity of the systems from the point of view of the limitations occurring here (e.g., steam-to-carbon ratio or operating temperature). Finally, we discussed the size of such a fuel cell in relation to the internal combustion engine, the entire ship, as well as the impact of the increase in efficiency on the range of the vessel.