Heat charge and discharge characteristics of non-phase change solid heat storage materials

doi:10.16085/j.issn.1000-6613.2020-0356

Abstract

Abstract:

A heat exchange testing system for off-peak electricity energy storage was built. The thermophysical properties of non-phase change solid heat storage materials, such as corundum ball, were measured by a data recorder and a Hot-Disk thermal constant analyzer. The heat charge and discharge characteristics of fly ash, magnesia, corundum sand and corundum ball were studied both experimentally and computationally. The influences of the type and particle size of the heat storage materials on the heat charge and discharge characteristics were analyzed. The thermal storage densities and comprehensive heat transfer coefficients of different materials were obtained. Combined with FLUENT unsteady state simulation method, the variation of heat charge and discharge temperature fields of the heat storage device with materials of different particle sizes were simulated. The results showed that the corundum ball provided enough heat continuously and thus could be used as a good heat storage material. The heat storage density and comprehensive heat transfer coefficient increased with the size enlargement of corundum sand, and the effective heat discharge time was longer accordingly.

Key words: heat storage material, heat charge and discharge characteristics, temperature field, numerical simulation, alumina

摘要：

搭建了低谷电蓄能蒸汽发生换热测试系统，采用数据记录仪、Hot Disk热常数分析仪等仪器检测了刚玉球等非相变固体蓄热材料的热物性。通过实验与模拟相结合的方式，研究了粉煤灰、氧化镁、刚玉砂、刚玉球等材料的蓄放热特性。分析了蓄热材料种类和粒径大小对蓄放热特性的影响，得到了不同材料的蓄热密度和综合换热系数等关键参数。结合FLUENT非稳态模拟方法，模拟了蓄热体在不同材料粒径下的蓄热和放热温度场变化规律。结果表明：刚玉球能够提供充足连续的热量，可以作为一种性能良好的蓄热材料进行应用；随着刚玉砂粒径的增大，其蓄热密度和综合换热系数会增大，有效放热时间也会延长。

关键词: 蓄热材料, 蓄放热特性, 温度场, 数值模拟, 氧化铝

CLC Number:

TK02

Shaowu YIN, Jiawei HAN, Yongle SHI, Lige TONG, Li WANG. Heat charge and discharge characteristics of non-phase change solid heat storage materials[J]. Chemical Industry and Engineering Progress, 2020, 39(12): 5161-5169.

尹少武, 韩嘉维, 石永乐, 童莉葛, 王立. 非相变固体蓄热材料的蓄放热特性[J]. 化工进展, 2020, 39(12): 5161-5169.

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