基于Aspen Plus的CaO/CaCO₃热化学储能与光热发电集成系统建模及分析

Modeling and analysis of CaO/CaCO₃ fluidized thermochemical energy storage system based on Aspen Plus

摘要

随着可再生能源的快速发展,其对大规模储能系统的依赖程度与日俱增。文章采用工业流程模拟软件Aspen Plus建立了MW级CaO/CaCO₃热化学储能与光热发电集成系统模型,分析了反应器的高径比、颗粒粒径、温度等不同参数对反应器结构及其系统性能的影响。结果表明:压力0.33 MPa下,平衡温度约为950 ℃,而实际运行中850 ℃即可实现接近完全转化;当反应器高径比为2.0、颗粒粒径为300 μm时,系统在低夹带量(0.13 kg/s)下实现了碳酸化转化率超过95%,同时流化床反应器床层量稳定,兼顾了反应效率与操作经济性;系统稳态运行循环效率达到41%,往返效率达到36%。

Abstract

With the rapid development of renewable energy, its increasing reliance on large-scale energy storage systems has become more prominent. This study established a MW-scale CaO/CaCO₃ thermochemical energy storage system integrated with concentrated solar power using Aspen Plus process simulation software. The impacts of reactor geometry, particle size, temperature and other parameters on reactor configuration and system performance were systematically analyzed. Results indicate that under 0.33 MPa pressure, the equilibrium temperature approximates 950 ℃, while near-complete conversion can be achieved at 850 ℃ in practical operation. With a reactor height-to-diameter ratio of 2.0 and particle size of 300 μm, the system achieves a carbonation conversion rate of over 95% at a low entrainment (0.13 kg/s), while maintaining stable bed inventory in the fluidized bed reactor, thereby balancing reaction efficiency and operational economy. The cycle efficiency of the system in steady-state operation reaches 41% and the round-trip efficiency reaches 36%.

关键词

热化学储能 / CaO/CaCO₃ / 流化床反应器

Key words

thermochemical energy storage / CaO/CaCO₃ / fluidized-bed reactor

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基金资助

山东省自然科学基金项目(ZR2020ME189)