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Investigation of calcium hydroxide powder for thermochemical storage modified with nanostructured flow agents
Solar Energy ( IF 6.7 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.solener.2020.03.033 M. Gollsch , S. Afflerbach , B.V. Angadi , M. Linder
Solar Energy ( IF 6.7 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.solener.2020.03.033 M. Gollsch , S. Afflerbach , B.V. Angadi , M. Linder
Abstract Thermal energy storage is a key component for power supply based on concentrating solar power. A promising thermochemical storage material in terms of cost-efficiency, storage density and reaction temperatures is based on the chemical reaction of calcium oxide with water. Handling of the solid materials, however, has proven to be difficult due to their powdery state particularly in dynamic storage systems. It is therefore proposed in the presented work to modify calcium hydroxide powder with nanostructured flow agents to improve the powder's flowability. Therefore, five additives consisting of nanostructured silicon and/or aluminium oxide were mixed systematically with calcium hydroxide powder and the flowability of the mixtures was determined using a ring shear cell. Four additives caused an improved flowability of the powder with additive weight fractions of 6–12%. After thermochemical cycling of the mixtures, however, flowability of the mixtures was clearly decreased while that of the pure powder was increased. Analysis of the samples showed a correlation between growth in particle size and increased flowability. Additionally, formation of calcium silicate and/or aluminate phases led to a decrease in absolute heat release of up to 50% as measured by thermal flux calorimetry, although some of the side products seemingly add to the measured heat release by hydrating exothermally. Based on these results, stabilisation of a moderately increased particle size preferably without the addition of additives is recommended, as a sole prevention of agglomeration by means of flow agents does not result in a manageable storage material.
中文翻译:
纳米结构流动剂改性的热化学储存氢氧化钙粉体的研究
摘要 热能储存是太阳能聚光供电的关键组成部分。就成本效率、存储密度和反应温度而言,一种有前途的热化学存储材料是基于氧化钙与水的化学反应。然而,固体材料的处理已被证明是困难的,因为它们呈粉末状,特别是在动态存储系统中。因此,在目前的工作中提出用纳米结构的流动剂改性氢氧化钙粉末以提高粉末的流动性。因此,将由纳米结构的硅和/或氧化铝组成的五种添加剂与氢氧化钙粉末系统地混合,并使用环形剪切池测定混合物的流动性。四种添加剂提高了粉末的流动性,添加剂的重量分数为 6-12%。然而,在混合物的热化学循环之后,混合物的流动性明显降低而纯粉末的流动性增加。对样品的分析表明粒度增长与流动性增加之间存在相关性。此外,通过热通量量热法测量,硅酸钙和/或铝酸盐相的形成导致绝对放热减少高达 50%,尽管一些副产物似乎通过水合放热增加了测量的放热。基于这些结果,建议最好在不添加添加剂的情况下稳定适度增加的粒度,
更新日期:2020-05-01
中文翻译:
纳米结构流动剂改性的热化学储存氢氧化钙粉体的研究
摘要 热能储存是太阳能聚光供电的关键组成部分。就成本效率、存储密度和反应温度而言,一种有前途的热化学存储材料是基于氧化钙与水的化学反应。然而,固体材料的处理已被证明是困难的,因为它们呈粉末状,特别是在动态存储系统中。因此,在目前的工作中提出用纳米结构的流动剂改性氢氧化钙粉末以提高粉末的流动性。因此,将由纳米结构的硅和/或氧化铝组成的五种添加剂与氢氧化钙粉末系统地混合,并使用环形剪切池测定混合物的流动性。四种添加剂提高了粉末的流动性,添加剂的重量分数为 6-12%。然而,在混合物的热化学循环之后,混合物的流动性明显降低而纯粉末的流动性增加。对样品的分析表明粒度增长与流动性增加之间存在相关性。此外,通过热通量量热法测量,硅酸钙和/或铝酸盐相的形成导致绝对放热减少高达 50%,尽管一些副产物似乎通过水合放热增加了测量的放热。基于这些结果,建议最好在不添加添加剂的情况下稳定适度增加的粒度,