Performance enhancement for thermal conductivity and thermal energy storage of sludge-incinerated slag/KNO<sub>3</sub> phase change composites

熊亚选; 高梓靖; 张艾桐露; 钱向瑶; 宋超宇; 何苗; 吴玉庭; 丁玉龙

doi:10.19666/j.rlfd.202412265

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Performance enhancement for thermal conductivity and thermal energy storage of sludge-incinerated slag/KNO₃ phase change composites

Thermal Power Generation Vol. 54, Issue 7, Pages: 127-134(2025)

更新时间：2026-08-11

- Performance enhancement for thermal conductivity and thermal energy storage of sludge-incinerated slag/KNO₃ phase change composites
- 作者机构：
  
  1. 北京建筑大学未来新材料研究院
  2. 北京京能热力发展有限公司通州分公司
  3. 北京工业大学传热强化与过程节能教育部重点实验室
  4. 英国伯明翰大学伯明翰储能中心
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202412265
  CLC： TB34;X703;TK11
- Published：2025
- 稿件说明：
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[1]熊亚选,高梓靖,张艾桐露,等.污泥焚烧灰渣/硝酸钾复合相变材料传热储热性能强化[J],2025,54(07):127-134.
[1]熊亚选,高梓靖,张艾桐露,等.污泥焚烧灰渣/硝酸钾复合相变材料传热储热性能强化[J],2025,54(07):127-134. DOI： 10.19666/j.rlfd.202412265.

DOI：10.19666/j.rlfd.202412265.

摘要

工业生产及城市居民生活产生大量污水污泥，污泥的填埋严重破坏生态环境。为大规模消纳市政污泥，变废为宝，将其制备成低碳低成本储热材料，提出添加碳化硅、氮化硼和膨胀石墨为导热增强剂，以强化污泥焚烧灰渣/硝酸钾复合相变储热材料（50%污泥焚烧炉渣+50%硝酸钾）导热性能的思路。通过制备复合相变储热材料，研究导热增强剂对复合相变储热材料热性能的影响。结果表明：膨胀石墨不适合作为污泥焚烧灰渣/硝酸钾复合相变储热材料的导热增强剂；添加质量分数为2%的导热增强剂在熔化潜热改善方面是最优的，且添加氮化硼优于添加碳化硅；添加质量分数为2%氮化硼的样品的导热系数提升最为显著，在100～400℃时分别比样品SC3（不加导热增强剂）升高65%、93%、117%、203%；经历1 000次加热/冷却循环后，氮化硼质量分数为2%的样品潜热为35.29 J/g，储热密度为292.1 J/g，碳化硅质量分数为2%的样品潜热为40.90 J/g，储热密度为334.9 J/g；碳化硅质量分数为2%的样品、氮化硼质量分数为2%的样品传热速率分别为0.16、0.17℃/s。研究结果初步证明碳化硅和氮化硼作为污泥焚烧灰渣/硝酸钾复合相变储热材料的导热增强剂是可行的。

Abstract

The industrial production and urban residents' lives have led to a large amount of wastewater and sludge

and the landfilling of sludge has caused severe ecological damage. To facilitate the large-scale disposal of municipal sludge

transform waste into valuable resources

and prepare low-carbon

low-cost thermal storage materials

an idea is innovatively proposed

in which the silicon carbide

boron nitride

and expanded graphite is added as thermal conductivity enhancers to enhance the thermal conductivity of sludge incineration ash/potassium nitrate composite phase change thermal storage materials(50% sludge incineration ash+50% potassium nitrate). The composite phase change thermal storage materials were prepared

and the effects of thermal conductivity enhancers on thermal performance of these materials were investigated. The results indicate that

the expanded graphite is not suitable as a thermal conductivity enhancer for sludge incineration ash/potassium nitrate composite phase change thermal storage materials. The addition of a thermal conductivity enhancer with a mass fraction of 2% is optimal for improving melting latent heat

with boron nitride performing better than silicon carbide. The samples with 2% boron nitride shows the most significant increase in thermal conductivity

rising by 65%

93%

117%

and 203% compared with samples SC3(without thermal conductivity enhancers) at temperatures of 100 ℃ to 400 ℃

respectively. After undergoing 1 000 cycles of heating/cooling

the samples with 2% boron nitride have a latent heat of 35.29 J/g and a thermal storage density of 292.1 J/g

while the samples with 2% silicon carbide have a latent heat of 40.90 J/g and a thermal storage density of 334.9 J/g. The heat transfer rates for the samples with 2% silicon carbide and 2% boron nitride are 0.16 ℃/s and 0.17 ℃/s

respectively. This preliminary evidence demonstrates the feasibility of using silicon carbide and boron nitride as thermal conductivity enhancers for sludge incineration ash/potassium nitrate composite phase change thermal storage materials.

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references

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Performance enhancement for thermal conductivity and thermal energy storage of sludge-incinerated slag/KNO3 phase change composites

DOI：10.19666/j.rlfd.202412265

摘要

Abstract

关键词

Keywords

references

Performance enhancement for thermal conductivity and thermal energy storage of sludge-incinerated slag/KNO₃ phase change composites