Cycle analysis and environmental assessments of cascade organic rankine cycle on diesel engine ships

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy Pub Date : 2024-11-07 DOI:10.1016/j.energy.2024.133752

Ji-Won Yoon , Suk-Ho Jung , Chang-Hyo Son , Ho-Saeng Lee , Seung-Taek Lim , Sung-Hoon Seol

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引用次数: 0

Abstract

This study investigates the application of organic Rankine cycle (ORC) on ships to reduce fuel oil consumption and assess improvements in the Energy Efficiency Existing Ship Index (EEXI), and carbon intensity indicator (CII). A cascade ORC(C-ORC) configuration is designed to utilize the exhaust gas from a diesel engine.

Thermodynamic simulation identified a combination of toluene and R1233zd as the optimal working fluids for the C-ORC. Exergy analysis was conducted to evaluate the performance difference between the C-ORC system and a version with an internal heat exchanger (C-IHX ORC). The results showed a maximum exergy efficiency of 56.78 % for the C-IHX ORC, compared to 49.33 % for the C-ORC. Further evaluations of the C-IHX ORC, including fuel savings, energy generation, EEXI, and CII, demonstrated that average vessel fuel consumption decreased by 1.02 %, and average attained EEXI improved by 0.93 %. Additionally, the attained CII value was enhanced by 0.98 % on average, depending on operating loads and traveled distances. Although the improvements of EEXI, and CII offered were modest, they present the potential for further enhancement through the utilization of additional waste heat sources, such as economizer steam, and jacket cooling water.

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柴油机船舶级联有机秩循环的循环分析和环境评估

本研究调查了有机郎肯循环（ORC）在船舶上的应用，以减少燃油消耗，并评估现有船舶能效指数（EEXI）和碳强度指标（CII）的改进情况。热力学模拟确定甲苯和 R1233zd 组合为 C-ORC 的最佳工作流体。为评估 C-ORC 系统与带有内部热交换器（C-IHX ORC）的系统之间的性能差异，进行了放能分析。结果显示，C-IHX ORC 的最高能效为 56.78%，而 C-ORC 为 49.33%。对 C-IHX ORC 的进一步评估（包括燃料节省、能源产生、EEXI 和 CII）表明，船舶的平均燃料消耗降低了 1.02%，平均 EEXI 提高了 0.93%。此外，根据运行负荷和航行距离的不同，达到的 CII 值平均提高了 0.98%。虽然 EEXI 和 CII 的改善幅度不大，但通过利用更多的废热源（如省煤器蒸汽和夹套冷却水），仍有进一步提高的潜力。

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来源期刊

Energy 工程技术-能源与燃料

CiteScore

15.30

自引率

14.40%

发文量

审稿时长

14.2 weeks

期刊介绍： Energy is a multidisciplinary, international journal that publishes research and analysis in the field of energy engineering. Our aim is to become a leading peer-reviewed platform and a trusted source of information for energy-related topics. The journal covers a range of areas including mechanical engineering, thermal sciences, and energy analysis. We are particularly interested in research on energy modelling, prediction, integrated energy systems, planning, and management. Additionally, we welcome papers on energy conservation, efficiency, biomass and bioenergy, renewable energy, electricity supply and demand, energy storage, buildings, and economic and policy issues. These topics should align with our broader multidisciplinary focus.