纳米材料对熔盐热物性的影响  

Influence of Nanomaterials on Thermal Performance of Molten Salt

作　　者：孟强[1] 李烁 侯东伟 熊亚选[2] MENG Qiang;LI Shuo;HOU Dongwei;XIONG Yaxuan

机构地区：[1]中国人民解放军63933部队,北京100091 [2]北京建筑大学供热供燃气通风及空调工程北京市重点实验室,北京100044

出　　处：《煤气与热力》2024年第11期1-6,共6页Gas & Heat

摘　　要：采用高温熔融法将纳米材料(SiO_(2)、MgO)均匀分散于太阳盐(NaNO_(3)质量分数60%、KNO_(3)质量分数40%)中,获得纳米熔盐。使用差示扫描量热法测试熔盐熔化潜热、熔点、比热容,结合纳米熔盐的微观结构分析纳米颗粒影响纳米熔盐比热容的机理。与太阳盐相比,添加SiO_(2)、MgO纳米颗粒后,纳米熔盐的熔化潜热增大、熔点降低。与太阳盐相比,添加SiO_(2)纳米颗粒后,纳米熔盐固态、液态比热容均增大。基本上,SiO_(2)纳米熔盐固态、液态比热容均随SiO_(2)纳米颗粒质量分数增大而减小。与太阳盐相比,添加MgO纳米颗粒后,纳米熔盐固态、液态比热容均增大。MgO纳米熔盐固态、液态比热容均表现为随MgO纳米颗粒质量分数增大的开口向下的抛物线形。纳米颗粒化学组成以及纳米颗粒与基盐的选择影响纳米熔盐比热容增强效果。微观结构分析结果证明了纳米颗粒分散均匀性影响纳米熔盐比热容增强效果。Nanomaterials(SiO_(2),MgO)were uniformly dispersed in solar salts(NaNO_(3) mass fraction 60%,KNO_(3) mass fraction 40%)using high-temperature melting method to obtain nano-molten salts.The latent heat,melting point and specific heat capacity of molten salt were measured by differential scanning calorimetry,and the mechanism of nanoparticles affecting the specific heat capacity of molten salt was analyzed by combining the microstructure of molten salt.Compared with solar salts,the latent heat of melting of nano-molten salts increased and the melting point decreased after the addition of SiO_(2)and MgO nanoparticles.Compared with solar salts,the specific heat capacity of nano-molten salts in both solid and liquid states increased after the addition of SiO_(2)nanoparticles.Basically,the specific heat capacity of SiO_(2)nanoparticles decreases with the increase of the mass fraction of SiO_(2)nanoparticles.Compared with the solar salt,the specific heat capacity of nano-molten salts in both solid and liquid states increased after the addition of MgO nanoparticles.The specific heat capacity of the MgO nano-molten salt in both solid and liquid states exhibited a parabolic shape with the increase of the mass fraction of MgO nanoparticles.The chemical composition of nanoparticles and the selection of nanoparticles and base salts can easily affect the enhancement effect of the specific heat capacity of nano-molten salts.The results of microstructure analysis show that the dispersion uniformity of nanoparticles affects the enhancement effect of the specific heat capacity of nano-molten salts.

关 键 词：储热 熔盐 纳米颗粒 热物性 微观结构 

分 类 号：TU995.7[建筑科学—供热、供燃气、通风及空调工程]