本文選題：四元溴化鹽 + 納米SiO��； 參考：《太陽能學報》2017年10期

【摘要】：高溫熔鹽作為一種高效的傳熱和蓄熱工質,其熔點的高低和熔化潛熱的大小決定著熔鹽的工作溫度和相變蓄熱能力。以化學純Na Br、KBr、CaBr_2、LiBr為基鹽,按照一定比例配制一種混合四元溴化鹽。為改善該混合熔鹽的性能,將納米SiO_2以一定質量分數(shù)均勻加入混合溴化鹽中,配制得到SiO_2納米溴化鹽。利用同步熱分析儀對四元溴化鹽和SiO_2納米溴化鹽的熔點和熔化潛熱進行實驗研究。實驗結果表明納米溴化鹽的熔點隨納米SiO_2質量百分含量的增大而緩慢下降,下降幅度在2.5℃以內;熔化潛熱隨納米SiO_2質量百分含量的增大呈近似直線規(guī)律升高,當納米SiO_2含量達到1.5%時,該納米SiO_2溴化鹽的熔化潛熱達到最大,較四元溴化鹽升高了89.6%;納米SiO_2的添加提高了四元溴化鹽的分解溫度及熱穩(wěn)定性。
[Abstract]:High temperature molten salt is an efficient heat transfer and heat storage medium. The melting point and latent heat of molten salt determine the working temperature and phase change heat storage ability of molten salt. A mixed quaternary bromine salt was prepared with chemical pure Na Br-KBr-CaBr-CaBr2LiBr as base salt. In order to improve the properties of the mixed molten salt, nano-SiO2 was added into the mixed bromine salt with a certain mass fraction and the Sio _ 2 nano-bromine salt was prepared. The melting point and melting latent heat of quaternary bromine salt and SiO2 nanocrystalline bromine salt were studied by synchronous thermal analyzer. The experimental results show that the melting point of nano-SiO2 decreases slowly with the increase of mass percent content of nano-SiO-2, and decreases within 2.5 鈩，

本文編號：2073355