Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (8): 4307-4314.DOI: 10.16085/j.issn.1000-6613.2022-1763

• Materials science and technology • Previous Articles     Next Articles

Optimization of thermochemical energy storage reactor based on calcium and magnesium binary salt hydrates

YE Zhendong1(), LIU Han1, LYU Jing1, ZHANG Yaning2, LIU Hongzhi3()   

  1. 1.School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
    2.School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150006, Heilongjiang, China
    3.Hokkaido University, Faculty of Engineering, Sapporo 0608628, Japan
  • Received:2022-09-21 Revised:2022-11-23 Online:2023-09-19 Published:2023-08-15
  • Contact: LIU Hongzhi

基于钙镁二元盐的热化学储能反应器的性能优化

叶振东1(), 刘涵1, 吕静1, 张亚宁2, 刘洪芝3()   

  1. 1.上海理工大学环境与建筑学院,上海 200093
    2.哈尔滨工业大学能源科学与工程学院,黑龙江 哈尔滨 150006
    3.北海道大学大学院工学研究院,日本 札幌 0608628
  • 通讯作者: 刘洪芝
  • 作者简介:叶振东(1996—),男,硕士研究生,研究方向为热化学储能。E-mail:yezhend@foxmail.com
  • 基金资助:
    国家自然科学基金青年基金(51906157);国家自然科学基金(71974129)

Abstract:

Thermochemical energy storage material of salt hydrate has high energy storage density, and the regeneration temperature is consistent with the temperature of solar collectors. It can be used to improve the utilization of solar energy. The optimization of thermochemical energy storage reactor based on salt hydrate is important for the thermal energy storage system. In this study, a two-dimensional numerical model of the packed bed reactor of Wakkanai Siliceous Shale (WSS) + MgCl2/2CaCl2 was established. The effects of the content of calcium and magnesium binary salt hydrate, particle size and the height of packed bed on the heat release process of packed bed were analyzed. The numerical simulation results showed that the outlet air temperature increased with the decrease of the particle size. The decay rate of the outlet air temperature decreased with the increase of the calcium-magnesium binary salt content, increased with the decrease of the particle size and decreased with incresing height of the packed bed. The large salt hydrate content and small particle size were conducive to get high heating power and energy storage density of the packed bed. When the height of the packed bed prolonged, the heat release power increased, while the energy storage density decreased. When the particle size of WSS20 was 2mm, the height of the packed bed reactor was 10cm, the energy storage density can reach 0.985GJ/m3, which was almost 4 times that of water.

Key words: thermochemical energy storage, solar energy, MgCl2/2CaCl2, packed bed, numerical simulation, energy storage density

摘要:

水合盐热化学储能技术储能密度高、再生温度与太阳能集热器的温度一致,在提高太阳能的利用和缓解能源紧张方面具有很好的应用前景,其中热化学储能反应器的设计优化则是重要环节。本文针对硅藻土(WSS)+ MgCl2/2CaCl2热化学储能系统,对填充床反应器建立了二维数值模型,对填充床的放热过程进行了研究,分析了钙镁二元盐含量、粒径大小、填充床高度对填充床放热过程的影响。数值模拟结果表明,填充床出口空气温升随粒径减小而增大;填充床出口空气温升的衰减速度随钙镁二元盐含量增大而减小,随粒径减小而增大,随填充床高度增大而减小;填充床的放热功率和储能密度随盐含量增大而增大,随粒径减小而增大,填充床高度增大时,填充床放热功率增大,而储能密度则减小。采用粒径为2mm的WSS20颗粒,填充高度为10cm的填充床反应器储能密度达到0.985GJ/m3,几乎是水的4倍。

关键词: 热化学储能, 太阳能, MgCl2/2CaCl2, 填充床, 数值模拟, 储能密度

CLC Number: 

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