摘要:
以提钒尾渣为初始原料,经碳热还原除铁处理后得到的提铁尾渣为主要原料,石墨材料为改性剂,采用粉末冶金方法进行了高温显热蓄热材料制备的试验研究。XRD物相分析结果表明,蓄热材料的主要物相包括Na6.65Al6.24Si9.76O32、多元素组成的铝硅酸盐、钛铁矿以及石墨。随着石墨含量的增加,蓄热材料密度和硬度均有下降趋势,而导热系数呈增长趋势。DSC测试结果表明,在500℃以上的中高温区域比热容数值较高。蓄热密度计算结果表明,在500~750℃范围内,显热蓄热材料蓄热密度为223 k J/kg,蓄热量为0.062 k Wh/kg,1 000 k Wh所需质量为16 000 kg。本研究制备的蓄热材料在500℃以上的温度范围内具有良好的蓄热能力,适用于高温蓄热系统当中。
Abstract:
The high temperature sensible heat storage material was prepared via powder metallurgy method,using the iron extraction tailing obtained by carbothermal reduction of the vanadium extraction tailing as the raw material and graphite as the modifier respectively.XRD results show that the main phases of the thermal storage material include Na6.65Al6.24Si9.76O32,aluminosilicate,ilmenite and graphite.With increase of the graphite content,both of the density and hardness of the thermal storage material decrease,while the thermal conductivity increases.The DSC results show that the specific heat capacity is higher in the medium and high temperature region above 500℃.It is shown that the heat storage density of the sensible heat storage material is 223 k J/kg at 500～750℃,with the heat storage capacity of 0.062 k Wh/kg and the mass required for 1 000 k Wh heat storage of 16 000 kg.The thermal storage material prepared in this study has good thermal storage capacity at temperatures above 500℃,which can be used in high temperature thermal storage system.
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