Preparation and adsorption heat storageperformance study of MgSO4-LiCl@MEG composite heat storage materials

doi:10.19799/j.cnki.2095-4239.2023.0346

Abstract

Abstract:

Hydrated salt thermo-chemisorption heat storage has attracted immense attention due to its low heat storage temperature, high energy storage density, long-term nondestructive storage, and clean and pollution-free characteristics. This study obtained hydrophilic modified expanded graphite (MEG) by modifying expanded graphite. And a composite heat storage material MgSO₄-LiCl@MEG was prepared by mixing MgSO₄ with LiCl using a mixed ball milling method. The optimal ratio of mixed salt was 9∶1, and four different ratios of MEG were used to prepare the composite heat storage materials. The water absorption rate of the composite was found to be higher than the theoretical value under the same salt content, indicating that MEG was added to effectively alleviate the caking of MgSO₄ and the solution of LiCl while improving the adsorption capacity. The desorption process could be completed within 120 min.The linear driven force (LDF) model was used to fit the adsorption kinetic constants of the composite, which were about 0.005 s^-1. The equilibrium water absorption of the composite increased with the increase inhumidity and decreased with the increase intemperature. The composite was characterized using scanning electron microscopy(SEM) and X-ray diffraction(XRD), showing that the mixed salt was physically bonded and dispersed uniformly in the flake pores of MEG. MEG10 showed the best performance of heat storage, where the heat storage density was 957 kJ/kg, the peak heat storage temperature was 115.2 ℃, the water absorption rate was 0.925 g/g, and the thermal conductivity was 2.07 W/(m·K), which was 16.97 times that of MgSO₄. After 40 cycles of testing, the heat storage density of MEG10 was only reduced by 31.2%, and the adsorption and desorption rates were reduced by 15.1% and 19.6%, respectively, indicating excellent thermal stability and adsorption and desorption performance. The mixed ball milling method significantly increased the salt content of the composite and served as a good reference for a long period and high-density heat storage technology.

Key words: hydrated salt, thermochemical adsorption heat storage, heat storage density, thermal conductivity, mixed ball milling method

CLC Number:

TK 02

Xueling ZHANG, Qiang YE, Junheng GU, Haoyun XUN, Qi ZHANG, Chuanxiao CHENG, Tingxiang JIN, Yeqiang ZHANG. Preparation and adsorption heat storageperformance study of MgSO₄-LiCl@MEG composite heat storage materials[J]. Energy Storage Science and Technology, 2023, 12(9): 2778-2788.

Figures/Tables 17

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Table 1

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Table 4

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参数	MEG5	MEG10	MEG15	MEG20
k_s/s^-1	0.00497	0.00504	0.00491	0.00499
R²	0.992	0.993	0.990	0.991

名称	比表面积/(m²/g)	孔容积/(cm³/g)	平均孔径/nm
MEG	36.10	0.1258	27.866
MEG5	4.63	0.0783	12.797
MEG10	5.32	0.0791	14.391
MEG15	5.92	0.0794	15.318
MEG20	6.06	0.0827	15.854

样品名称	储热温度/℃	吸附能力/(g/g)	储热密度/(kJ/kg)	导热系数/[W/(m·K)]	参考
MEG10	115.2	0.925	957	2.07	本工作
MgSO₄-硅藻土	150	0.37	722.9	—	[3]
MgSO₄-EG	150	0.57	718.9	0.7524	[12]
SrBr₂-石墨	150	0.42	600	<1.5	[25]
LiCl-硅胶	<100	—	450	—	[26]

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Preparation and adsorption heat storageperformance study of MgSO₄-LiCl@MEG composite heat storage materials

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