Study on shape-stable phase-change heat-storage materials based on waste concrete

doi:10.3969/j.issn.1674-1951.2021.10.011

Abstract

Abstract:

The collection and synthesis of the skeleton materials for thermal energy storage（TES） will pollute our environment.To achieve the goal of carbon peaking and carbon neutrality as soon as possible,consume large-scale municipal solid wastes and avoid serious waste concrete accumulation,we take waste concrete as the skeleton material to fabricate shape-stable phase-change heat-storage materials.The chemical compatibility of a shape-stable phase-change material was analyzed by X-Ray Diffraction（XRD）.And the micro-structure,thermal conductivity and TES performance of the composite were characterized by Scanning Electron Microscopy（SEM）,Differential Scanning Calorimeter（DSC）and Laser Flash Analysis（LFA）.The experimental results show the shape-stable composite is of the best molding effect and decent chemical compatibility when its nitrate mass fraction is 50%.With this proportion,its latent heat is 31 kJ/kg,the heat storage density is 505.90 kJ/kg in the range of 100~400 ℃,and the thermal conductivity is 0.12 W/（m·K）.It can be concluded that using waste concrete as the skeleton material for heat-storage composite is feasible.

Key words: solid waste, solid waste concrete, skeleton material, X-Ray Diffraction, Differential Scanning Calorimetry, thermal storage capacity, carbon neutrality, carbon peak

CLC Number:

TK02

XIONG Yaxuan, HU Ziliang, WANG Huixiang, YAO Chenhua, SONG Chaoyu, DING Yulong. Study on shape-stable phase-change heat-storage materials based on waste concrete[J]. Huadian Technology, 2021, 43(10): 86-91.

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项目	复合材料
项目	CC1	CC2	CC3	CC4	CC5	CC6	CC7	CC8	CC9	CC10
ω（硝酸钠）/%	30.00	60.00	57.50	52.50	50.00	47.50	45.00	42.50	40.00	35.00
ω（废旧混凝土）/%	70.00	40.00	42.50	47.50	50.00	52.50	55.00	57.50	60.00	65.00
ω（聚乙烯醇）/%	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0
烧结后目视检查	N	S	L	L	N	L	N	L	N	L