基于钙镁二元盐的热化学储能反应器的性能优化

doi:10.16085/j.issn.1000-6613.2022-1763

化工进展 ›› 2023, Vol. 42 ›› Issue (8): 4307-4314.DOI: 10.16085/j.issn.1000-6613.2022-1763

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.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

收稿日期:2022-09-21 修回日期:2022-11-23 出版日期:2023-08-15 发布日期:2023-09-19
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)

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.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:2023-08-15 Published:2023-09-19
Contact: LIU Hongzhi

摘要/Abstract

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

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

中图分类号:

TK11

叶振东, 刘涵, 吕静, 张亚宁, 刘洪芝. 基于钙镁二元盐的热化学储能反应器的性能优化[J]. 化工进展, 2023, 42(8): 4307-4314.

YE Zhendong, LIU Han, LYU Jing, ZHANG Yaning, LIU Hongzhi. Optimization of thermochemical energy storage reactor based on calcium and magnesium binary salt hydrates[J]. Chemical Industry and Engineering Progress, 2023, 42(8): 4307-4314.

图/表 16

图1 填充床反应器示意图及物理模型图

表1 复合材料的物性参数

参数	数值
参数	WSS	WSS7	WSS13	WSS20
钙镁二元盐的质量分数w/%	0	7.37	13.65	20.38
孔隙率e	0.60	0.57	0.55	0.52
表观密度ρ_s/kg·m^-3	856	924	991	1071
吸附热/J·mol^-1	40680

图2 复合材料的等温吸附线（25℃）[11]

图3 网格无关性验证

图4 与文献[20]实验结果对比验证

表2 模拟结果与实验结果的最大和最小相对误差

时间/h	出口空气相对湿度的相对误差/%		出口空气温度的相对误差/%
时间/h	最大	最小	最大	最小
0~4	27.5	14.0	5.8	1.2
4~8	14.2	8.7	4.7	2.4
8~12	2.0	6.3	1.5	0.3
12~16	1.6	0.9	0.1	0.02

图5 填充床内的流场

图6 填充床内的温度场

图7 钙镁二元盐含量对出口空气温湿度的影响

图8 不同钙镁二元盐含量填充床的材料吸附量变化

图9 不同钙镁二元盐含量填充床的放热功率和储能密度

图10 不同粒径填充床的出口空气温升

图11 不同粒径填充床内材料的吸附量

图12 不同粒径填充床的放热功率和储能密度

图13 填充床高度对填充床反应器性能的影响

图14 不同高度填充床内材料的吸附量

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基于钙镁二元盐的热化学储能反应器的性能优化

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

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