Optimization and analysis of a new liquefied natural gas and nitrogen cascade pre-cooling hydrogen liquefaction process

IF 2.5 3区工程技术 Q3 PHYSICS, APPLIED

Cryogenics Pub Date : 2026-01-01 Epub Date: 2025-12-01 DOI:10.1016/j.cryogenics.2025.104253

Shanshan Sun , Wenquan Jiang , Fan Yang , Changshun Wang , Junjie Liu , Meng Yang

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Abstract

Liquid hydrogen storage currently represents the most prominent method among hydrogen storage technologies. To minimize the energy demand of the hydrogen liquefaction system, a hydrogen liquefaction system which utilizes liquefied natural gas (LNG) and a nitrogen (N₂) reverse Brayton cycle for cascade pre-cooling of hydrogen is designed. The comparative analysis of the proposed hydrogen liquefaction improvement system with other systems shows that the proposed system has great advantages. Through systematic optimization, the system achieves a specific energy consumption (SEC) of 5.24 kWh/kg_LH2, a coefficient of performance (COP) of 0.254, and an exergy efficiency (η_ex) of 58.88%. Furthermore, by leveraging the surplus cold energy from LNG for pre-cooling the cryogenic refrigerant prior to inter-stage compression in the cryogenic cooling process, the SEC decreases by 8.87% and η_ex increases by 8.83% compared to conventional ambient temperature pre-cooling methods.

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液化天然气-氮气叶栅预冷氢液化新工艺的优化与分析

液氢储存是目前储氢技术中最突出的一种方法。为了最大限度地减少氢液化系统的能源需求，设计了一种利用液化天然气（LNG）和氮气（N2）逆布雷顿循环对氢进行串级预冷的氢液化系统。将所提出的氢液化改进系统与其他系统进行了对比分析，表明所提出的系统具有很大的优势。通过系统优化，系统比能耗（SEC）为5.24 kWh/kgLH2，性能系数（COP）为0.254，火用效率（ηex）为58.88%。此外，通过在低温冷却过程中利用LNG的剩余冷能在级间压缩之前对低温制冷剂进行预冷，与传统的环境温度预冷方法相比，SEC降低了8.87%，ηex增加了8.83%。

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来源期刊

Cryogenics 物理-热力学

CiteScore

3.80

自引率

9.50%

发文量

审稿时长

2.1 months

期刊介绍： Cryogenics is the world''s leading journal focusing on all aspects of cryoengineering and cryogenics. Papers published in Cryogenics cover a wide variety of subjects in low temperature engineering and research. Among the areas covered are: - Applications of superconductivity: magnets, electronics, devices - Superconductors and their properties - Properties of materials: metals, alloys, composites, polymers, insulations - New applications of cryogenic technology to processes, devices, machinery - Refrigeration and liquefaction technology - Thermodynamics - Fluid properties and fluid mechanics - Heat transfer - Thermometry and measurement science - Cryogenics in medicine - Cryoelectronics