Experimental Study on Thermal Storage Characteristics and Thermal Stability of Solid Particles
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 stabili-ty 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 ther-mal storage material for fluidized heat exchangers.
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