Preparation and properties of low-cost phase-change heat storage materials based on semi-coke ash

doi:10.3969/j.issn.1674-1951.2021.07.010

Abstract

Abstract:

To promote the large-scale consumption of industrial solid wastes and avoid damage on environment brought by the accumulation of semi-coke ash,we proposed an innovative semi-coke ash/Na₂CO₃ shaped phase-change heat storage material which is prepared by cold compression-hot sintering（CCHS）method.Taking laser flash analyzer（LFA）,thermo-gravimetric and differential scanning calorimetry（TG-DSC）and X-ray diffraction（XRD）,the thermal conductivity,thermal storage and chemical compatibility of the shaped phase-change heat storage material were characterized.The results show that the best properties of the composite can be obtained when the mass ratio of semi-coke ash to Na₂CO₃ is 52.5∶47.5.Under this ratio,the composite's thermal conductivity is up to 0.41 W/（m∙K） between 100 and 800 ℃,and its energy storage density is up to 1 101.14 kJ/kg between 100 and 900 ℃.

Key words: solid waste, framework material, shaped phase-change composite, carbon neutrality, semi-coke, energy storage, heat storage, renewable energy

CLC Number:

TK02

XIONG Yaxuan, YAO Chenhua, SONG Chaoyu, WANG Huixiang, HU Ziliang, DING Yulong. Preparation and properties of low-cost phase-change heat storage materials based on semi-coke ash[J]. Huadian Technology, 2021, 43(7): 62-67.

Figures/Tables 8

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项目	定型相变储热材料
项目	CC0	CC1	CC2	CC3	CC4	CC5	CC6	CC7	CC8
ω(PCM)/%	100.0	60.0	50.0	47.5	45.0	42.5	40.0	35.0	30.0
ω(骨架材料)/%	0.0	40.0	50.0	52.5	55.0	57.5	60.0	65.0	70.0
ω(烧结剂)/%	–	3.0	3.0	3.0	3.0	3.0	3.0	3.0	3.0
烧结后目视观察效果	–	S	L	N	N	N	N	N	N