储能科学与技术 ›› 2025, Vol. 14 ›› Issue (9): 3319-3329.doi: 10.19799/j.cnki.2095-4239.2025.0172

• 储能材料与器件 • 上一篇    

基于SrBr2·6H2O的封闭式热化学反应器储/放能特性模拟研究

李承晨1(), 余庆华1(), 代慧涛2, 贾娜3, 王琳3, 孙彬博1   

  1. 1.武汉理工大学汽车工程学院，湖北 武汉 430070
    2.中国长江三峡集团有限公司电力市场研究中心，北京 100038
    3.中国长江三峡集团有限公司科学技术研究院，北京 101199
  • 收稿日期:2025-02-25 修回日期:2025-03-28 出版日期:2025-09-28 发布日期:2025-09-05
  • 通讯作者: 余庆华 E-mail:333913@whut.edu.cn;qhyu@whut.edu.cn
  • 作者简介:李承晨（2000—），男，硕士研究生，研究方向为热化学储能，E-mail：333913@whut.edu.cn；
  • 基金资助:
    湖北省自然科学基金联合基金(2023AFD187)

Numerical study on charging/discharging characteristics of a closed thermochemical reactor based on SrBr2·6H2O

Chengchen LI1(), Qinghua YU1(), Huitao DAI2, Na JIA3, Lin WANG3, Binbo SUN1   

  1. 1.School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, Hubei
    2.Power Market Research Center, China Three Gorges Corporation, Beijing 100038, China
    3.Institute of Science and Technology, China Three Gorges Corporation, Beijing 101199, China
  • Received:2025-02-25 Revised:2025-03-28 Online:2025-09-28 Published:2025-09-05
  • Contact: Qinghua YU E-mail:333913@whut.edu.cn;qhyu@whut.edu.cn

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摘要：

为研究基于SrBr2·6H2O的封闭式热化学反应器的储/放能特性，本文建立了相应的三维瞬态多物理场耦合模型，分析了储/放能过程中反应器内的温度、转化率以及换热流体出口温度的变化情况，比较了不同形状的翅片对储/放能过程的强化效果，并讨论了换热流体(HTF)温度、流速和水蒸气压力对反应器储/放能性能的影响。结果表明，封闭式热化学反应器内的径向传热受到热化学储能材料(TCM)低导热系数的限制，采用翅片不仅能够加快反应速率，而且可以提高放能过程中的能量品位，且当表面积相同时，纵向翅片对反应器的传热的强化效果优于横向翅片：与无翅片反应器相比，纵向翅片反应器和横向翅片反应器的储/放能时间分别减少了36.96%、35.97%和20.74%、20.07%；HTF温度和水蒸气压力对反应器的影响十分显著，HTF温度的增加促进储能过程，使储能时间减少59.94%，储能功率增大，但是也会抑制放能过程，使放能时间增加65.26%，放能功率减小。水蒸气压力的增加抑制储能过程而促进放能过程，使储能时间增加了40.83%，放能时间减少了84.39%；HTF流速的增大有利于TCM和HTF之间的换热，使储/放能时间分别减少14.14%和5.91%。研究结果能够为封闭式水合盐热化学反应器的实际应用提供重要指导和参考。

关键词: 热化学储能, SrBr2·6H2O, 翅片, 传热传质

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.

Key words: thermochemical energy storage, SrBr2·6H2O, fin, heat and mass transfer

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