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Energy, exergy, and economic (3E) analysis of an organic Rankine cycle using zeotropic mixtures based on marine engine waste heat and LNG cold energy
Energy Conversion and Management ( IF 10.4 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.enconman.2020.113657
Zhen Tian , Weijie Zeng , Bo Gu , Yuan Zhang , Xin Yuan

Abstract In this paper, thermo-economic performance comparisons between zeotropic mixtures and pure fluids are conducted via simulation for a parallel two-stage organic Rankine cycle (PTORC) driven by waste heat from LNG-fueled ship. The exhaust gas and jacket water of the marine engine work as heat sources, and the LNG fuel is considered as heat sink. R1150/R170 and R170/R1270 are employed as the working fluids in the first stage while R600a/R601a and R600/R601 are used in the second stage. The effects of working fluids and pinch point temperature difference (PPTD) on the PTORC performances are studied from the viewpoint of the first and the second law of thermodynamics. It concludes that the zeotropic mixtures do not always exhibit an advantage over the pure fluids. The highest net power of the PTORC is 146.9 kW obtained with R1150-R600a. The results of PPTD indicate that LNG regasification should occur in the first-stage condenser. The maximum energy efficiency and exergy efficiency of the PTORC are 22.09% and 23.28%, respectively. The best economic performances of the PTORC are achieved with R170/R1270 (0.9/0.1, mass fraction)-R600. The total cost, payback period, and levelized energy cost vary in the range of 5.98–8.08 × 105 $, 4.58–5.18 years, and 0.065–0.074 $/kWh, respectively.

中文翻译:

使用基于船用发动机废热和 LNG 冷能的共沸混合物的有机朗肯循环的能量、火用和经济 (3E) 分析

摘要 在本文中,通过模拟由 LNG 燃料船舶的废热驱动的平行两级有机朗肯循环 (PTORC),对共沸混合物和纯流体之间的热经济性能进行了比较。船用发动机的废气和夹套水作为热源工作,LNG燃料作为散热器。第一级采用R1150/R170和R170/R1270作工质,第二级采用R600a/R601a和R600/R601作工质。从热力学第一定律和第二定律的角度研究了工作流体和夹点温差(PPTD)对 PTORC 性能的影响。得出的结论是,共沸混合物并不总是表现出优于纯流体的优势。使用 R1150-R600a 获得的 PTORC 的最高净功率为 146.9 kW。PPTD 的结果表明 LNG 再气化应该发生在第一级冷凝器中。PTORC 的最大能效和火用效率分别为 22.09% 和 23.28%。使用 R170/R1270(0.9/0.1,质量分数)-R600 实现了 PTORC 的最佳经济性能。总成本、投资回收期和平准化能源成本分别在 5.98–8.08 × 105 $、4.58–5.18 年和 0.065–0.074 $/kWh 的范围内变化。
更新日期:2021-01-01
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