在双碳目标下,热电解耦对提高热电联产机组调峰灵活性具有重要作用。流化床固体颗粒储热在热电解耦上的应用可解决储热水罐温度范围小的问题,同时对提高能源利用效率具有重要作用。流化床换热器具有流化换热系数高的特点,具有广阔的应用前景,但用于热电解耦的流化床换热器的储热颗粒的选择有待进一步深入研究。本文选取四种来源广泛、价格低廉的沙漠沙、石英砂、玄武岩、气化粗渣作为储热材料,并分别对四种材料的密度与比热容进行了测试,对热处理前后的样品进行了SEM、XRD与XRF的分析,试验结果表明,四种储热材料的储热能力顺序为：玄武岩>沙漠沙>石英砂>气化粗渣,对最优的玄武岩与沙漠沙热稳定性进行测试,热稳定性顺序为：玄武岩>沙漠沙,结合储热性能、热稳定性及经济性综合考虑,沙漠沙的综合储热性能最优,可以作为流态化换热器的储热材料。

As the dual carbon target, heat-power decoupling technologies play an important role in improving the flexibility of peak adjustment for cogeneration units. The application of fluidized bed solid particle heat storage in thermoelectric decoupling can solve the problem of small temperature range of heat storage in water tanks, and enhance energy utilization efficiency. Fluidized bed heat exchangers with the characteristic of high fluidized heat transfer coefficient own broad application prospects, but the selection of heat storage particles for fluidized bed heat exchangers applying to thermoelectric decoupling transformation needs further research. This article selected four widely sourced and low-cost solid particles as heat storage materials which included desert sand, quartz sand, basalt, and coal gasification coarse slag and tested the density and specific heat capacity of the four materials. SEM, XRD, and XRF analysis were conducted on the samples before and after heat treatment. The experimental results showed that the heat storage capacity of the four heat storage materials was in the order of basalt>desert sand>quartz sand>coal gasification coarse slag, and the thermal stability of basalt and desert sand which were optimal in heat storage capacity was tested in the following order: basalt>desert sand. Considering thermal storage performance, thermal stability, and economy, desert sand has the best thermal storage performance and can be used as a thermal storage material for fluidized bed heat exchangers.

TK221

中国科学院战略性先导科技专项课题(XDA29010100)