Development of low-melting point molten salts and detection of solid-to liquid transitions by alternative techniques to DSC

被引:12
作者
del Rodo Rodriguez-Laguna, Maria [1 ,2 ,3 ]
Gomez-Romero, Pedro [1 ,2 ]
Sotomayor Torres, Clivia M. [1 ,2 ,4 ]
Lu, Ming-Chang [5 ]
Chavez-Angel, Emigdio [1 ,2 ]
机构
[1] CSIC, Catalan Inst Nanosci & Nanotechnol ICN2, Campus UAB, Barcelona 08193, Spain
[2] BIST, Campus UAB, Barcelona 08193, Spain
[3] Univ Autonoma Barcelona, Dept Quim, Barcelona 08193, Spain
[4] ICRFA, Pg Lius Companys 23, Barcelona 08010, Spain
[5] Natl Taiwan Univ, Dept Mech Engn, Taipei 10617, Taiwan
关键词
Solar thermal conversion; Molten salts; Low melting point; Heat transfer fluids; Thermal conductivity; Raman spectroscopy; Thermal energy storage; THERMAL-ENERGY STORAGE; CONCENTRATING SOLAR POWER; NITRATE; SYSTEMS; PLANTS; RAMAN; STABILITY; SPECTRA;
D O I
10.1016/j.solmat.2019.110107
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The 'Solar salt (60% NaNO3-40% KNO3, wt. %) is the most used heat transfer and storage material in high temperature CSP systems. The main drawback is its high melting temperature of 228 degrees C, which requires extra-energy to keep it in the liquid state and avoid damage to pipes at low temperatures. Multi-component salts are combinations of different cations and anions. The difference in size of the ions hinders the crystallization of the material and provides lower melting temperatures. Multi-component salts are considered in this study to replace simpler combinations, such as binary and ternary eutectic mixtures. Herein, we report on two novel six-component nitrates with a melting temperature of 60-75 degrees C and a thermal stability up to similar to 500 degrees C under a linear heating program in N-2 atmosphere. Properties such as the thermal conductivity in solid and molten state, heat capacity and vibrational spectra were evaluated. The study of the thermal behaviour of these materials using differential scanning calorimetry was insufficient, hence alternative and complementary techniques were used, such as: the three-omega technique, optical transmission and Raman spectroscopy. Multi-component salts were found to solidify as amorphous solids even at slow cooling rates and water was found to behave as a catalyst of crystallization.
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页数:9
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