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,Wenzhong Gao,Yuan Zhang,Bo Gu

doi:10.3390/en13061397

Zhen Tian, Yingying Yue + Show 3 more

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https://doi.org/10.3390/en13061397

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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.

Highlights

Maritime transport enjoys low cost and accounts for 80% of global trade by volume and more than 70% of cargo value [1]
Results proved that compared with pure working fluids (WFs), the net power output of organic Rankine cycle (ORC) system with zeotropic mixtures could be increased by 9.0%
Based on on the the two and condensation pressures, the combined system is optimized under the fixed heat source and cold pressures, the combined ORC system is optimized under the fixed heat source and cold source

Summary

Introduction

Maritime transport enjoys low cost and accounts for 80% of global trade by volume and more than 70% of cargo value [1]. Burning of ship fuel brings serious environmental problems due to pollutant emissions, such as CO2 , SOx, NOx and particle material. Maritime Organization’s new rules limit the sulphur content of bunker fuel to 0.5% of the weight of ocean-going ships, well below the 3.5% limit set in 2012 [2]. In this context, liquified nature gas (LNG). Compared with conventional heavy fuel oil, LNG could reduce emissions by 85–95% of NOx, 20% of CO2 and 100% of SOx [4]. The number of LNG fueled ships in-service and on-order is increasing and is expected to account for 32% of shipping energy demand by 2050 [5]

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