Multi-Objective Thermo-Economic Optimization of a Combined Organic Rankine Cycle (ORC) System Based on Waste Heat of Dual Fuel Marine Engine and LNG Cold Energy Recovery

Zhen Tian, Yingying Yue, Yuan Zhang, Bo Gu and Wenzhong Gao
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Zhen Tian: Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China
Yingying Yue: Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China
Yuan Zhang: Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China
Bo Gu: Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China
Wenzhong Gao: Merchant Marine College, Shanghai Maritime University, Shanghai 201306, China

Energies, 2020, vol. 13, issue 6, 1-23

Abstract: In this paper, a combined organic Rankine cycle (ORC) system that can effectively utilize the cold energy of Liquefied Nature Gas (LNG) and the waste heat of dual fuel (DF) marine engine was proposed. Particularly, the engine exhaust gas and the jacket cooling water of the DF marine engine were used as heat sources. Firstly, a thorough assessment of thermo-economic performance was conducted for the combined ORC system using 11 environmentally friendly working fluids (WFs). Afterwards, the effects of evaporation and condensation pressures on the net output work, energy efficiency, exergy efficiency, total investment cost and payback period were examined. Furthermore, the thermo-economic performances of the ORC system were optimized via multi-objective optimization with a genetic algorithm. Finally, exergy destructions and investment costs of each component under the optimal operating conditions were analyzed to make suggestions for further improvement. The results show that R1150-R1234yf-R600a and R170-R1270-R152a are the two most promising WF combinations. The exergy destruction of the combined ORC system mainly exists in heat exchangers. Through WF optimization, the exergy destruction in the intermediate heat exchanger was reduced by 18.99%. The proportion of expanders investment cost could be greater than 50% and the payback period of the combined ORC system varies in the range of 7.68–9.43 years. This study demonstrated that the selection of WF and the optimization of operating conditions had important potential to improve thermo-economic performances of ORC systems.

Keywords: LNG cold energy; organic Rankine cycle system; working fluid combination; thermo-economic analysis; multi-objective 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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (10)

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