Preparation and performance study of incinerated slag based shape-stable phase change composites

被引：0

作者：

Song C. ^{[1
]}

Xiong Y. ^{[1
]}

Zhang J. ^{[2
]}

Jin Y. ^{[1
]}

Yao C. ^{[1
]}

Wang H. ^{[1
]}

Ding Y. ^{[3
]}

机构：

[1] Beijing Key Laboratory of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, School of Environmental and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing

[2] Beijing Building Research Institute Co., Ltd. of CSCEC, Beijing

[3] Birmingham Center for Energy Storage, University of Birmingham, Birmingham

来源：

Huagong Xuebao/CIESC Journal | 2022年 / 73卷 / 05期

关键词：

Chemical compatibility; Municipal sludge; Phase change; Preparation; Skeleton materials; Stability; Thermal energy storage;

D O I：

10.11949/0438-1157.20211680

中图分类号：

学科分类号：

摘要：

Massive accumulation and landfill of municipal sludge will damage the local ecological environment around the city. Incineration can realize the harmlessness of municipal sludge, however, the heavy metals inside the incinerated slag are difficult to be effectively fixed. In order to effectively fix the heavy metals inside the incinerated slag and recycle the slag to produce low-cost shape-stable phase change composites, this work proposed the sludge incinerated slag as skeleton material, and five slag-based shape-stable phase change composites were prepared with sodium nitrate as phase change material with different mass ratio of incinerated slag to sodium nitrate by cold-compression & hot-sintering method. Then, the thermal performance, micromorphology, mechanical performance and chemical compatibility between the slag components and the sodium nitrate were investigated. Results shows that the shape-stable phase change composite with the mass ratio 5:5 of slag to sodium nitrate, namely the sample SS3 possesses the best heat transfer and thermal energy storage performance as well as excellent high-temperature thermal stability, which fixed the heavy metals inside properly. Moreover, a good chemical compatibility between the slag components and the sodium nitrate is observed and the sample SS3 achieves the thermal energy storage density of 409.25 J/g and the maximum thermal conductivity of 0.955 W/(m·K) in the range of 100-400℃ and the mechanical strength of 139.65 MPa. In addition, the sample SS3 possesses excellent heat transfer and thermal energy storage performance after 500 heating/cooling cycles, which indicates that sludge incinerated slag is suitable for preparing low-cost shape-stable phase change composites as skeleton materials. © 2022, Editorial Board of CIESC Journal. All right reserved.

引用

页码：2279 / 2287

页数：8

共 31 条

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