Design and analysis of LNG cold energy utilization system combining hydrogen liquefaction and power output

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-06-27 DOI:10.1016/j.ijrefrig.2025.06.032

Xu Zheng, Yan Li, Ji Zhang, Han Yuan, Ning Mei

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引用次数: 0

Abstract

The integration of hydrogen liquefaction with power output represents a forward-looking approach in the context of liquefied natural gas (LNG) gasification processes. This study proposes a system that incorporates a double cascade organic Rankine cycle (ORC) and an enhanced deep-cooling liquefaction cycle to optimize cold energy utilization and efficiency during the hydrogen cryogenic cooling stage. Additionally, the optimization process employs both the particle swarm optimization algorithm (PSO) and the non-dominated sorting genetic algorithm (NSGA-II). The findings indicate that NSGA-II outperforms PSO, achieving an exergy efficiency of 61.01 %, a net ORC output power of 1584 kW, and a specific energy consumption of 6.67 kWh/kg_H2. Economic and exergy analyses undertaken to evaluate and contrast the conventional system with the proposed one. The results demonstrate a cost savings of 8.2 % in the improved system, accompanied by a decrease in the helium mass flow rate from 18.51 kg/s to 12.65 kg/s. This study aims to offer theoretical support for refrigeration cycles in the hydrogen liquefaction stage and LNG gasification processes.

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氢液化与电力输出相结合的LNG冷能利用系统设计与分析

氢液化与电力输出的整合代表了液化天然气（LNG）气化过程背景下的前瞻性方法。本研究提出了一种结合双级联有机朗肯循环（ORC）和强化深度冷却液化循环的系统，以优化氢低温冷却阶段的冷能利用和效率。此外，优化过程采用了粒子群优化算法（PSO）和非支配排序遗传算法（NSGA-II）。结果表明，NSGA-II优于PSO，实现了61.01%的火用效率，净ORC输出功率为1584 kW，比能耗为6.67 kWh/kgH2。进行经济和能源分析，以评价和比较传统系统与拟议系统。结果表明，改进后的系统节省了8.2%的成本，同时氦气质量流量从18.51 kg/s降低到12.65 kg/s。本研究旨在为氢液化阶段和LNG气化过程的制冷循环提供理论支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Refrigeration-revue Internationale Du Froid 工程技术-工程：机械

CiteScore

7.30

自引率

12.80%

发文量

363

审稿时长

3.7 months

期刊介绍： The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.