Green and Efficient Recovery and Optimization of Waste Heat and LNG Cold Energy in LNG-Powered Ship Engines

Xinglin Yang (), Qiang Lei, Junhu Zou, Xiaohui Lu and Zhenzhen Chen
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Xinglin Yang: School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Qiang Lei: School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Junhu Zou: School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Xiaohui Lu: School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China
Zhenzhen Chen: School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China

Energies, 2023, vol. 16, issue 24, 1-30

Abstract: This study focuses on the Wartsila 9L34DF engine and proposes an integrated system for low-temperature carbon capture using the coupling of cold and hot energy recovery with membrane separation in LNG-powered ships. By utilizing a series dual-pressure organic Rankine cycle (SDPORC) system to recover waste heat from the engine exhaust gases and generate electricity, the system provides power support for the low-temperature carbon capture compression process without consuming additional ship power. To validate the accuracy and reliability of the mathematical model, the simulation results are compared with the literature’s data. Once the model’s accuracy is ensured, the operational parameters of the integrated system are analyzed. Subsequently, working fluid optimization and genetic algorithm sensitive parameter optimization are conducted. Finally, under the optimal operating conditions, the thermodynamic performance and economic evaluation of the integrated system are assessed. The results demonstrate that the net power output of the integrated system is 100.95 kW, with an exergy efficiency of 45.19%. The unit carbon capture cost (UCC) is 14.24 $/ton, and for each unit of consumed LNG, 1.97 kg of liquid CO 2 with a concentration of 99.5% can be captured. This integrated system significantly improves the energy utilization efficiency of ships and reduces CO 2 emissions.

Keywords: LNG-powered ships; cold and heat energy recovery; ORC; carbon capture; genetic algorithm optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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