A study on vermiculite-based salt mixture composite materials for low-grade thermochemical adsorption heat storage
A study on vermiculite-based salt mixture composite materials for low-grade thermochemical adsorption heat storage
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DOI：
10.1016/j.energy.2023.127986
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发表时间：
2023-06-01
期刊：
影响因子：
9
通讯作者：
Riffat, Saffa
中科院分区：
文献类型：
--
作者：
Chen, Ziwei;Zhang, Yanan;Riffat, Saffa
人们需要高性能的可再生能源技术来满足清洁能源转型期间的巨大需求。热能存储可以帮助平衡可再生能源供应与最终用户需求之间的不匹配。热化学吸附储热（TAHS）因其有效利用低品位可再生能源和废热的能力而受到广泛关注。复合吸附材料已引起越来越多的研究兴趣，它通过在基质中浸渍盐来将吸湿盐和基质结合在一起。本文回顾了 TAHS 复合材料的最新进展，并提供了不同蛭石基复合材料的材料特性分析。该复合材料使用蛭石作为主体基质，浸渍不同的二元和三元盐混合物（即MgSO4-CaCl2、MgCl2-LiNO3、MgSO4-LiCl和MgSO4-LiNO3-MgCl2）。用 MgSO4-CaCl2 二元混合物浸渍的蛭石表现出 1213 kJ/kg 的高储能密度，在低品位热的温度范围内具有快速解吸动力学。它非常适合国内TAHS应用，特别是空间供暖，在20次充放电循环后具有稳定的循环性能，保持了约91.3%的初始储能密度。这项研究的结果有助于不断增长的复合材料研究，并证明了用二元盐混合物浸渍的蛭石基复合材料用于低品位 TAHS 的潜力。
High-performance renewable energy technologies are desired to meet the enormous demand during the clean energy transition. Thermal energy storage can help balance the mismatch between renewable energy supplies and end-user's demands. Thermochemical adsorption heat storage (TAHS) has attracted widespread attention for its ability to efficiently utilise low-grade renewables and waste heat. Composite adsorbent materials have been gaining increased research interest, which combine hygroscopic salts and host matrix via impregnating salts in the matrix. This paper reviews recent progress in composite materials for TAHS and provides material charac-terisation analysis on different vermiculite-based composites. The composites use vermiculite as the host matrix with impregnation of different binary and ternary salt mixtures (i.e., MgSO4-CaCl2, MgCl2-LiNO3, MgSO4-LiCl and MgSO4-LiNO3-MgCl2). Vermiculite impregnated with a binary mixture of MgSO4-CaCl2 demonstrated a high energy storage density of 1213 kJ/kg, with fast desorption kinetics in the temperature range of low-grade heat. It shows good suitability for domestic TAHS applications, particularly for space heating, with stable cyclic performance over 20 charging-discharging cycles, maintaining approximately 91.3% of its initial energy storage density. The findings of this study contribute to the growing body of research on composite materials and demonstrate the potential of vermiculite-based composites impregnated with binary salt mixtures for low-grade TAHS.