六水氯化镁相变储热材料的研究进展

doi:10.12028/j.issn.2095-4239.2016.0061

摘要/Abstract

摘要： 六水氯化镁（水氯镁石）的相变温度为117 ℃左右，相变焓为160 kJ/kg，具有储热密度大、不可燃性、价格相对低廉以及热导率较高等优点，是中温储能领域重要的相变材料。本文综述了六水氯化镁的相变温度、相变焓、比热容、热导率、密度等热物性研究进展，揭示了六水氯化镁作为相变材料存在过冷特性、相分离、腐蚀性的固有缺点，分析了加入合适成核剂和增稠剂改进其性能的方法。同时，综述了六水氯化镁在储能领域作为单种或混合相变材料的应用。六水氯化镁与其它的盐混合（共晶）后相变焓较大，具有良好的应用前景。

关键词: 储热技术, 相变材料, 六水氯化镁, 过冷, 相分离

Abstract: Magnesium chloride hexahydrate (bischofite) has a phase transition temperature at about 117 ℃ with a phase change enthalpy of 160 kJ/kg. Such a material is non-flammable and has a high thermal conductivity and low price, and is therefore regarded as a promising phase change material (PCM) for medium temperature thermal energy storage applications. This paper aims to provide a state-of-the-art review on thermophysical properties of the material, including phase transition temperature, phase change enthalpy, heat capacity, thermal conductivity and density. Potential problems are identified for using the material as a PCM, including the extent of supercooling, phase separation, corrosion, and hygroscopicity of hexahydrate magnesium chloride. Discussion is made on possible solutions to these problems. It is concluded that good cycle stability could be achieved if a suitable nucleating agent and a thickener are used. Potential applications of the material as a PCM or as part of PCM mixtures are discussed.

Key words: thermal energy storage, phase change material, magnesium chloride hexahydrate, supercooling, phase separation

王会春，凌子夜，方晓明，苑坤杰，张正国. 六水氯化镁相变储热材料的研究进展[J]. 储能科学与技术, 2017, 6(2): 204-212.

WANG Huichun, LING Ziye, FANG Xiaoming, YUAN Kunjie, ZHANG Zhengguo. Recent progress in the use of magnesium chloride hexahydrate used as a phase change material#br#[J]. Energy Storage Science and Technology, 2017, 6(2): 204-212.

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