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| A NaNO3-KNO3-Mg(NO3)2 Molten Nitrate Salt Used for Solar Thermal Power Generation |
| DU Baoqiang1,2, WANG Huaiyou1,3, LI Jinli1,3, ZHAO Youjing1,3, YANG Hongjun1,3, ZHONG Yuan1,3, WANG Min1,3
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1 Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008;
2 University of Chinese Academy of Sciences, Beijing 100049;
3 Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008 |
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Abstract Solar Salt (60%NaNO3-40%KNO3) is widely used in solar thermal power generation as heat storage medium. NaNO3-KNO3-Mg(NO3)2 (NKM) ternary molten salt was obtained in this work through adding magnesium nitrate in Solar Salt molten salt, and a subsequent melt-blending process. The process parameters and conditions were optimized, and thermophysical properties of NKM ternary molten salt were obtained. The optimized composition of NKM ternary molten salt was 49.5%NaNO3-33%KNO3-17.5%Mg(NO3)2. Compared with HTS (53%KNO3-40%NaNO2-7%NaNO3) and Solar Salt, NKM ternary molten salt showed lower melting point and viscosity, higher density, better heat capacity and thermal conductivity, which indicated an application prospect as a promising candidate of medium temperature energy storage material for solar thermal power generation.
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Published: 08 May 2018
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2017, Vol. 31 
