Simulation and Optimization Research of a Two-Stage Organic Rankine Cycle System Based on LNG Cold Energy Recovery

IF 3.4 4区工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY

Korean Journal of Chemical Engineering Pub Date : 2026-04-01 DOI:10.1007/s11814-026-00709-z

Dan Jiao, Zhang Zheng, Ziqiang Lv

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Abstract

This study aims to maximize cold energy utilization during liquefied natural gas (LNG) regasification and enhance system energy efficiency. A two-stage organic Rankine cycle (ORC) system was simulated in Aspen HYSYS software, with synergistic optimization of the four-component working fluid (R50/R170/R290/R600a) composition and key operating parameters (evaporation/condensation pressures). Thermodynamic and economic performance of four schemes were compared: baseline case, two HYSYS-optimized cases and genetic algorithm (GA)-optimized case. The results show that heat exchangers dominated exergy destruction (baseline case: 75.62%, HYSYS-optimized (three-component) case: 56.88%, HYSYS-optimized (four-component) case: 55.10%, GA-optimized case: 62.88%), demonstrating that the working fluid optimization significantly improves heat transfer matching of heat exchangers. In the GA-optimized case, the net power generation of two-stage ORC system can reach 154.56 kW, with an exergy efficiency of 37%. Additionally, the system exhibits good economic feasibility, with a levelized energy cost (LEC) of 0.08 $/kWh and a payback period (PBP) of 5.95 years.

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基于LNG冷能回收的两级有机朗肯循环系统仿真与优化研究

本研究旨在最大限度地利用液化天然气（LNG）再气化过程中的冷能，提高系统的能源效率。利用Aspen HYSYS软件对两级有机朗金循环（ORC）系统进行了模拟，并对四组分工作流体（R50/R170/R290/R600a）组成和关键操作参数（蒸发/冷凝压力）进行了协同优化。比较了基线方案、两种hysys优化方案和遗传算法（GA）优化方案的热力学和经济性能。结果表明：换热器在火用破坏中占主导地位（基线工况：75.62%，hysys优化（三组分）工况：56.88%，hysys优化（四组分）工况：55.10%，ga优化工况：62.88%），表明工质优化显著提高了换热器的换热匹配。在ga优化情况下，两级ORC系统净发电量可达154.56 kW，火用效率为37%。此外，该系统具有良好的经济可行性，平准化能源成本（LEC）为0.08美元/千瓦时，投资回收期（PBP）为5.95年。

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来源期刊

Korean Journal of Chemical Engineering 工程技术-工程：化工

CiteScore

4.60

自引率

11.10%

发文量

310

审稿时长

4.7 months

期刊介绍： The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.