摘要
利用硝酸盐熔盐熔点低、比热容高、热分解温度高的特性,制备一种新型硝酸盐熔盐[在Ca(NO_3)_2∶KNO_3为0.47∶0.53的熔盐体系中添加0.1%~15%的新型添加剂],并对该熔盐的热力学特性及使用成本进行了测试分析。结果表明,新型熔盐的熔点为120.1℃,熔化潜热为76.37 J/g,分解温度为588℃,平均比热容为1.598 J/(g·K),相比较于传统的Solar salt和Hitec熔盐热力学性能具有较大提升。采用测量范围内比热容的积分平均值来代替整个温度范围内熔盐的比热容,通过计算得出该体系熔盐的显热蓄热成本为108元/(k W·h)。此外,对新型熔盐的热扩散系数以及导热系数进行的测试分析,进一步证明了该熔盐在太阳能光热发电中作为蓄热传热介质具有巨大的潜在应用价值。
The thermal properties of a Ca（NO_3）_2-KNO_3（0.47∶0.53）based nitrate molten salt with an additive（0.1%to 15%）was prepared,characterized and cost-analyzed.Such a system has a low melting point,a high specific heat capacity and a high thermal decomposition temperature.It was shown that the new formulation had a melting point of 120.1℃with a latent heat of fusion of 76.37 J·g^（-1）,a decomposition temperature of 588℃,and an average specific heat of 1.598 J·（g·K）^（-1）,illustrating an enhanced performance than traditional solar salt and Hitec formulations.The results also suggested a cost of RMB 108 yuan per kW·h.
作者
盛鹏
赵广耀
徐丽
李光彬
马光
陈新
韩钰
邹露璐
吴玉庭
SHENG Peng;ZHAO Guangyao;XU Li;LI Guangbin;MA Guang;CHEN Xin;HAN Yu;ZOU Lulu;WU Yuting(Material Laboratory of State Grid Corporation of China,State Key Laboratory of Advanced Transmission Technology,Global Energy Interconneetion Research Institute Co.,Ltd.,Beijing 102209,China;Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing Key Laboratory of Heat Transfer and Energy Conversion,College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China)
出处
《储能科学与技术》
CAS
CSCD
2018年第4期682-686,共5页
Energy Storage Science and Technology
基金
国家电网公司科学技术项目(SGRI-DL-71-16-018)
关键词
硝酸盐
熔盐介质
蓄热
热力学
nitrate
molten salt medium
latent heat
thermodynamic
