储能科学与技术2025，Vol.14Issue(9)：3319-3329,11.DOI:10.19799/j.cnki.2095-4239.2025.0172
基于SrBr2·6H2O的封闭式热化学反应器储/放能特性模拟研究
Numerical study on charging/discharging characteristics of a closed thermochemical reactor based on SrBr2·6H2O
摘要
Abstract
To investigate the energy storage and release characteristics of a closed thermochemical reactor utilizing SrBr2·6H2O,a three-dimensional transient coupled model integrating fluid flow,heat transfer,and thermochemical reactions was established.The model was employed to analyze variations in temperature,conversion rate,and heat transfer fluid(HTF)outlet temperature during the energy storage and release processes.The effects of different fin configurations on thermal performance were compared,and the influences of HTF temperature,HTF flow velocity,and water vapor pressure on reactor performance were systematically examined.The results indicate that radial heat transfer within the reactor is constrained by the low thermal conductivity of the thermochemical energy storage material(TCM).Fins accelerate reaction rates and improve the thermal grade of the heated fluid during discharge.Under equivalent surface area conditions,longitudinal fins exhibit superior heat transfer enhancement and energy storage/release performance compared to radial fins.Specifically,the storage and discharge times of the longitudinal fin reactor are reduced by 36.96%and 35.97%,respectively,while those of the radial fin reactor are reduced by 20.74%and 20.07%,respectively,relative to the nonfin reactor.HTF temperature and water vapor pressure exert significant impacts.An increase in HTF temperature promotes the charging process,reducing the charging time by 59.94%and increasing the charging power.However,it inhibits the discharging process,increasing the discharging time by 65.26%and decreasing the discharging power.Conversely,higher water vapor pressure hinders the energy storage process and facilitates energy release,increasing the energy storage time by 40.83%and reducing the energy release time by 84.39%.Although increasing HTF flow velocity enhances heat transfer between TCM and HTF and accelerates the charging and discharging processes,its influence is less pronounced,reducing the charging and discharging times by only 14.14%and 5.91%,respectively.These findings provide valuable guidance for the practical application of closed hydrated salt thermochemical reactors.关键词
热化学储能/SrBr2·6H2O/翅片/传热传质Key words
thermochemical energy storage/SrBr2·6H2O/fin/heat and mass transfer分类
能源科技引用本文复制引用
李承晨,余庆华,代慧涛,贾娜,王琳,孙彬博..基于SrBr2·6H2O的封闭式热化学反应器储/放能特性模拟研究[J].储能科学与技术,2025,14(9):3319-3329,11.基金项目
湖北省自然科学基金联合基金(2023AFD187). （2023AFD187）
