Fabrication and performance investigation of Na2CO3/Carbide slag shape-stable phase change composites

doi:10.19799/j.cnki.2095-4239.2022.0378

Abstract

Abstract:

This study innovatively fabricated seven Na₂CO₃/carbide slag shape-stable phase-change composites (SSPCCs) with carbide slag (industrial solid waste) instead of traditional skeleton materials as skeleton material via the cold-compression hot-sintering method to recycle the industrial solid waste and reduce the cost of thermal energy storage (TES) systems. Then, the TES performance, mechanical property, microstructure, thermal cycling stability, and chemical compatibility were investigated using the differential scanning calorimetry, constant-speed pressuring method, scanning electron microscopy method, high-temperature thermal shock method, X-ray diffraction analysis, and Fourier transform infrared absorption spectroscopy. Results indicated that by combining carbide slag with Na₂CO_3, one might create good SSPCCs. The SSPCC (sample NC5) with the mass fraction of 52.45% carbide slag to 47.5% Na₂CO₃ reached the optimal performance with a TES density of 993 J/g in the range of 100 ℃ to 900 ℃ and compressive strength of 22.02 MPa and a maximal thermal conductivity of 0.62 W/(m·K). Different components are distributed evenly and are compatible with one another in sample NC5. Moreover, sample NC5 still had excellent TES performance after the 100 heating/cooling cycles, which can provide technical support for solid waste recycling and low-cost TES materials development.

Key words: Industrial solid waste, skeleton material, shape-stable phase change composite, thermal energy storage performance, thermal cycling stability

CLC Number:

TB 332

Huixiang WANG, Yaxuan XIONG, Jing REN, Chenhua YAO, Chaoyu SONG, Yuting WU, Yulong DING. Fabrication and performance investigation of Na₂CO₃/Carbide slag shape-stable phase change composites[J]. Energy Storage Science and Technology, 2022, 11(12): 3819-3827.

Figures/Tables 10

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References 17

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项目	NC1	NC2	NC3	NC4	NC5	NC6	NC7
Na₂CO₃/%	60	55	52.5	50	47.5	45	40
电石渣/%	40	45	47.5	50	52.5	55	60
烧结后宏观形貌

样品	熔化起始温度/℃	熔化峰值温度/℃	熔化终止温度/℃	熔化潜热 /(J/g)
Na₂CO₃	841.3	855.4	859.3	307.90
NC4	793.5	820.6	826.5	92.23
NC5	793.9	821.2	827.2	81.10
NC6	795.9	821.5	828.9	79.59

Fabrication and performance investigation of Na₂CO₃/Carbide slag shape-stable phase change composites

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