Numerical simulation study on reaction beds with hierarchically gradient porosity for calcium-based thermal energy storage

CAO Yanqing; WEI Xuewen; SUN Jian; HUAI Xiulan; XU Min

doi:10.19799/j.cnki.2095-4239.2025.1143

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Numerical simulation study on reaction beds with hierarchically gradient porosity for calcium-based thermal energy storage

Energy Storage Materials and Devices | 更新时间：2026-07-13

- Numerical simulation study on reaction beds with hierarchically gradient porosity for calcium-based thermal energy storage
- Energy Storage Science and Technology Vol. 15, Issue 6, Pages: 2046-2057(2026)
- 作者机构：
  
  1.南京师范大学能源与机械工程学院，江苏南京 210042
  2.中科南京未来能源系统研究院，江苏南京 211135
  3.中国科学院工程热物理研究所，北京 100190
  4.中国科学院大学，北京 100049
- 作者简介：
- 基金信息：
- DOI：10.19799/j.cnki.2095-4239.2025.1143
  CLC： TM 53
- Received：19 December 2025，
  
  Revised：2026-02-02，
  
  Published：28 June 2026
- 稿件说明：
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曹彦青, 魏雪雯, 孙健, 等. 多级梯度孔隙钙基热化学储能反应床结构优化[J]. 储能科学与技术, 2026, 15(6): 2046-2057.

CAO Yanqing, WEI Xuewen, SUN Jian, et al. Numerical simulation study on reaction beds with hierarchically gradient porosity for calcium-based thermal energy storage[J]. Energy Storage Science and Technology, 2026, 15(6): 2046-2057.
曹彦青, 魏雪雯, 孙健, 等. 多级梯度孔隙钙基热化学储能反应床结构优化[J]. 储能科学与技术, 2026, 15(6): 2046-2057. DOI： 10.19799/j.cnki.2095-4239.2025.1143.

CAO Yanqing, WEI Xuewen, SUN Jian, et al. Numerical simulation study on reaction beds with hierarchically gradient porosity for calcium-based thermal energy storage[J]. Energy Storage Science and Technology, 2026, 15(6): 2046-2057. DOI： 10.19799/j.cnki.2095-4239.2025.1143.

摘要

钙基热化学储能体系中传质的限制是影响其性能的关键因素，本研究提出并构建了一种融合梯度孔隙分布与多级孔通道的复合结构反应床，旨在协同优化反应床内的传热与传质路径。通过建立三维数值模型，模拟了Ca(OH)

脱水过程的储热反应，系统探究了梯度孔隙与多级孔通道对传热、传质及反应动力学的耦合强化机制，并进一步揭示了孔通道体积占比与入口温度对储能性能的影响规律。结果表明，在本研究的一级至四级孔通道范围内，随着级数增加，反应床的传热传质性能与反应速率呈现持续提升的趋势。相较于传统均匀的孔隙结构，孔通道占比为8%的四级梯度孔通道模型的床层平均温度提高约16.6%，反应达到完全所需时间缩短约27.98%。本研究明确了“梯度孔隙优化传热路径、多级孔通道强化水蒸气输运”的协同作用机理，为高性能钙基热化学储能反应床的结构与参数优化提供了理论依据与工程指导。

Abstract

Mass transfer limitations constitute a critical bottleneck affecting performance in calcium-based thermochemical energy storage systems. In this study

we propose a composite-structured reaction bed integrating gradient pore distribution with multilevel pore channels to synergistically optimise heat and mass transfer pathways within the bed. By establishing a three-dimensional numerical model

the heat storage reaction during Ca(OH)

dehydration was simulated to systematically investigate the coupled enhancement mechanisms of heat transfer

mass transfer

and reaction kinetics driven by gradient porosity and multilevel pore channels. Further

we elucidate the influence patterns of pore volume fraction and inlet temperature on energy storage performance. Results indicate that within the studied 1-4-level pore channel range

heat/mass transfer performance and reaction rate exhibit a sustained upward trend with increasing level number. Compared with conventional uniform pore structures

the four-level gradient pore channel model with an 8% pore channel volume fraction achieved an approximately 16.6% increase in bed average temperature and a 27.98% reduction in the time required for complete conversion. This study elucidates the synergistic mechanism by which gradient porosity optimizes heat transfer pathways

while multilevel channels enhance water vapor transport. It provides theoretical foundations and engineering guidance for the structural design and parameter optimization of high-performance calcium-based thermochemical energy storage reactors.

关键词

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