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Multi-criteria assessment and optimization of waste heat recovery for large marine diesel engines
Journal of Cleaner Production ( IF 11.1 ) Pub Date : 2021-05-10 , DOI: 10.1016/j.jclepro.2021.127307
Tiancheng Ouyang , Guicong Huang , Yucai Lu , Benlong Liu , Xiaoyi Hu

The energy crisis combined with increasingly severe environment pollution have highlighted the significance of the energy conservation and emission reduction in shipping industry. To improve the energy utilization rate and reduce pollution, a dual-pressure organic Rankine cycle system is proposed to reuse the heat of exhaust gas in marine engines. Many researches focused on the thermodynamics and thermos-economics of the waste heat recovery system, and optimized it from these two goals to recover more energy and decrease cost. However, the impact of the system itself on the environment, which was significant to assess the greenness, was often neglected in these studies. The system with high energy recovery rate may also cause serious environment pollution in the manufacturing or operation process, hence the environmental factor should be taken into account in the optimization. To solve the problems, an evaluation method combined thermodynamics, economics and environment is proposed. The parametric study of the dual-pressure organic Rankine cycle system with six common used working fluids is assessed by this method. Finally, taking the indicators of evaluation method as objective function, the multi-objective optimization method is conducted to figure out the optimum operation conditions for the system. Results show cyclopentane is the optimal working fluid considering thermodynamic, economic and environmental properties. Under the conditions of the evaporation pressure in high-pressure circuit 2.79 MPa, the evaporation pressure in low-pressure circuit 1.97 MPa, the condensation temperature 35 °C, the superheating temperature 1.2 °C, the system obtains a good performance with exergy efficiency 60.24%, electricity production cost 0.167 $/kWh and the environmental impact of net power output 11831.9 mPts/GJ.



中文翻译:

大型船用柴油机余热回收的多标准评估和优化

能源危机与日益严重的环境污染相结合,凸显了航运业节能减排的重要性。为了提高能源利用率并减少污染,提出了一种双压力有机朗肯循环系统,以重新利用船用发动机中的废气热量。许多研究集中在废热回收系统的热力学和热经济学方面,并从这两个目标对其进行了优化,以回收更多的能源并降低成本。但是,在这些研究中,常常忽略了系统本身对环境的影响,这对于评估绿色程度非常重要。具有较高能量回收率的系统还可能在制造或运营过程中造成严重的环境污染,因此,在优化过程中应考虑环境因素。为了解决这些问题,提出了一种将热力学,经济学和环境相结合的评价方法。通过这种方法评估了具有六种常用工作流体的双压力有机朗肯循环系统的参数研究。最后,以评估方法的指标为目标函数,进行了多目标优化方法,以求出系统的最佳运行条件。结果表明,考虑到热力学,经济和环境特性,环戊烷是最佳的工作流体。在高压回路中的蒸发压力为2.79 MPa,低压回路中的蒸发压力为1.97 MPa,冷凝温度为35°C,过热温度为1.2°C的条件下,

更新日期:2021-05-15
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