储能科学与技术2026，Vol.15Issue(6)：2046-2057,12.DOI:10.19799/j.cnki.2095-4239.2025.1143
多级梯度孔隙钙基热化学储能反应床结构优化
Numerical simulation study on reaction beds with hierarchically gradient porosity for calcium-based thermal energy storage
摘要
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)2 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
热化学储能/Ca(OH)2/CaO体系/热质传递/梯度孔隙/多级孔Key words
thermochemical energy storage/CaO/Ca(OH)2/heat and mass transfer/gradient porosity/hierarchically porous分类
信息技术与安全科学引用本文复制引用
曹彦青,魏雪雯,孙健,淮秀兰,许闽..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):2046-2057,12.基金项目
中国科学院战略性先导科技专项(A类)(XDA0400102) （A类）
江苏省碳达峰碳中和科技创新专项资金(BE2022614). （BE2022614）
