Parameter control in synthesis of Vermiculite-CaCl2 composite materials for thermochemical adsorption heat storage
Parameter control in synthesis of Vermiculite-CaCl2 composite materials for thermochemical adsorption heat storage
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DOI：
10.1016/j.energy.2024.130478
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发表时间：
2024-01
期刊：
影响因子：
9
通讯作者：
Yong Zhang;Ziwei Chen;Yanan Zhang;Yuehong Su;S. Riffat
中科院分区：
文献类型：
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作者：
Yong Zhang;Ziwei Chen;Yanan Zhang;Yuehong Su;S. Riffat
本研究以蛭石为基体，探索合成蛭石-CaCl2复合材料（VCM）的各种浸渍方法，重点研究这些方法对VCM作为热化学材料性能的影响。结果表明，与单次浸渍相比，替代浸渍方法（例如多步、真空、高压和高温）降低了 VCM 孔隙率，导致盐含量更高（CaCl2 含量测试证实）。多步浸渍产生的 VCM 盐含量高达 81.37 wt%，超过最高文献值 (68 wt%) 和对照组 VCM-s (51 wt%)。真空浸渍显着增加盐渗透，导致 VCM-vac 具有最低的孔隙率。然而，孔隙率的降低导致水合和脱水率降低。值得注意的是，VCM-vac 的储能密度最高为 2.05 GJ/m3，大约是文献报道值的三倍，是研究对照组 VCM-s 的 1.5 倍。它还超过了富含 CaCl2 的 VCM-m 0.2 GJ/m3。它还表现出卓越的循环稳定性，大多数 CaCl2 保持内化，最大限度地减少团聚和 CaCl2 损失。真空浸渍的能耗估计为 3.51 kWh/kg（盐），表明能耗相对较低。研究结果表明真空浸渍成为合成热化学复合材料的首选方法。
This study utilised vermiculite as a matrix to explore various impregnation methods for synthesising vermiculite-CaCl2composite materials (VCMs), focusing on the impact of these methods on the performance of VCMs as thermochemical materials. Results indicate that alternative impregnation methods (e.g., multi-step, vacuum, high pressure, and high temperature) reduce VCM porosity compared to single impregnation, resulting in higher salt content as confirmed by CaCl2content tests. Multi-step impregnation yields VCMs with an exceptional salt content of 81.37 wt%, surpassing the highest literature value (68 wt%) and the control group VCM-s (51 wt%). Vacuum impregnation notably increases salt penetration, leading to VCM-vac having the lowest porosity. However, this reduced porosity results in lower hydration and dehydration rates. Notably, VCM-vac exhibits the highest energy storage density of 2.05 GJ/m³, which is approximately three times the reported literature values and 1.5 times greater than the study's control group VCM-s. It also exceeds the CaCl2-rich VCM-m by 0.2 GJ/m³. It also demonstrates superior cyclic stability, with most CaCl2remaining internalised, minimising agglomeration and CaCl2loss. The energy consumption for vacuum impregnation is estimated at 3.51 kWh/kg(salt), indicating relatively low energy usage. The findings indicate vacuum impregnation emerges as a preferred method for synthesising thermochemical composite materials.