固体颗粒储热特性及热稳定性实验研究

Experimental Study on Thermal Storage Characteristics and Thermal Stability of Solid Particles

为选择流态化换热器的储热材料,选取4种来源广泛、价格低廉的沙漠沙、石英砂、玄武岩和气化粗渣,在不同温度下分别对4种材料的密度与比热容进行了测试,并对热处理前后的样品进行了扫描电子显微镜(SEM)、X射线荧光光谱(XRD)与X射线衍射(XRF)的分析。实验结果表明:4种储热材料的储热能力排序为玄武岩>沙漠沙>石英砂>气化粗渣;对储热能力最优的玄武岩与沙漠沙热稳定性进行测试,热稳定性排序为玄武岩>沙漠沙;综合考虑储热性能及热稳定性,玄武岩可以作为流态化换热器的储热材料。

In order to choice thermal storage material of fluidized heat exchanger,four widely sourced and low-cost solid particles as heat storage materials were selected,including desert sand,quartz sand,basalt and coal gasification coarse slag.The density and specific heat capacity of the four materials were separately tested at different temperatures.And scanning electron microscope(SEM),X-ray diffraction(XRD)and X-ray fluorescence(XRF)analyses were conducted on the samples before and after heat treatment.The experimental results show that the heat storage capacity of the four heat storage materials is in the order of basalt>desert sand>quartz sand>coal gasification coarse slag,and the thermal stability of basalt and desert sand with optimal heat storage capacity is tested in the following order:basalt>desert sand.Considering thermal storage performance and thermal stability,basalt can be used as a thermal storage material for fluidized heat exchangers.