Effects of CO2 capture on carbide-steel slag shape-stable phase-change composites

doi:10.19799/j.cnki.2095-4239.2023.0683

Abstract

Abstract:

To achieve sufficient utilization of industrial solid waste and reduce the cost of thermal energy storage (TES) systems, a mixture of alkaline solid waste of carbide slag (CS) and steel slag (SS) is selected at a 1∶1 ratio for CO₂ capture and sequestration. In addition, seven types of carbon-captured shape-stable phase-change composite materials (CCSMs) with different ratios of NaNO₃/CS-SS were prepared by combining CS and SS as the skeleton materials after CO₂ sequestration. Furthermore, thermogravimetric analysis was conducted to characterize the carbon sequestration properties of the CS-SS hybrid materials. Moreover, the TES performance, thermal cycling stability, chemical compatibility, and microstructure of CCS were characterized using differential scanning calorimetry (DSC), high-temperature thermal shock method, X-ray diffraction (XRD) analysis,and scanning electron microscopy. The results indicate that the carbon-sequestration rate of the CS-SS hybrid material is 24.48%. Furthermore, the mass ratio of NaNO₃, CS, and SS in the best thermal performance sample of CC-SC4 was 2∶1∶1, with its thermal storage density reaching 444.2 J/g at a working temperature of 100—400 ℃, thermal conductivity of 1.057 W/(m·K), and chemical compatibility among the components. Sample CC-SC4 exhibited excellent thermal storage performance after 1440 heating/cooling cycles.

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

CLC Number:

TB 332

Yang YANG, Yaxuan XIONG, Jing REN, Yanqi ZHAO, Shuo LI, Xi TIAN, Yulong DING. Effects of CO₂ capture on carbide-steel slag shape-stable phase-change composites[J]. Energy Storage Science and Technology, 2023, 12(12): 3690-3698.

Figures/Tables 13

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样品	成分/%
样品	CaO	SiO₂	Fe₂O₃	Al₂O₃	MgO	Others
电石渣	94.42	3.05	0.17	1.35	0.28	0.73
钢渣	11.09	25.736	37.62	7.164	2.048	16.342

样品	相变材料/%	工作温度/℃	储热密度/(J/g)	参考文献
NaNO₃/CS-SS	50	100～400	444.2	本工作
NaNO₃/diatomite	70	20～370	644.39	[23]
NaNO₃/SIA	50	100～400	409.25	[16]
NaNO₃/SCA	50	100～380	325.91	[15]

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Effects of CO₂ capture on carbide-steel slag shape-stable phase-change composites

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样品	CC-SC1	CC-SC2	CC-SC3	CC-SC4	CC-SC5	CC-SC6	CC-SC7
混合骨架材料/%	20	30	40	50	60	70	80
NaNO₃/%	80	70	60	50	40	30	20
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