三元混合熔盐的制备与实验研究
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摘要
制备了由氯化钾、碳酸钠、碳酸钾组成的36种不同比例的混合熔盐,利用差式扫描量热仪对试样的熔点及凝固点进行了实验研究,并对优选出的试样进行了稳定性实验。结果表明:氯化钾成分越小,熔盐熔点越小,三元混合熔盐中可以发生共融的配比试样的熔点为570～580℃,凝固点主要集中在550～570℃之间。实验优选出的试样配比为2∶3∶5(氯化钾∶碳酸钠∶碳酸钾),具有568.9℃的较低熔点和545.3℃的较低凝固点,能够有效避免管路系统的堵塞问题。期望对三元混合熔盐在太阳能领域的应用提供参考和依据。
36 kinds of mixed salts made of KCl,Na2 CO_3 and K2 CO_3 were prepared.The melting point and solidification point of the samples were studied by DSC,and the stability of the selected samples were also tested.The results showed that the smaller component of KCl,the smaller melting point of molten salt.The melting point of the samples which melted together was 570～580℃,and the freezing point was mainly between 550 and 570℃.The test ratio of the samples were selected from experiments was 2∶3∶5(KCl∶Na2 CO_3∶K2 CO_3).The samples had a low melting point at 568.9℃ and a low freezing point at 545.3℃,which can effectively avoid the blockage of piping system.The research results will provide reference and basis for the application of ternary mixed molten salt in solar energy field.
36 kinds of mixed salts made of KCl,Na2 CO_3 and K2 CO_3 were prepared.The melting point and solidification point of the samples were studied by DSC,and the stability of the selected samples were also tested.The results showed that the smaller component of KCl,the smaller melting point of molten salt.The melting point of the samples which melted together was 570～580℃,and the freezing point was mainly between 550 and 570℃.The test ratio of the samples were selected from experiments was 2∶3∶5(KCl∶Na2 CO_3∶K2 CO_3).The samples had a low melting point at 568.9℃ and a low freezing point at 545.3℃,which can effectively avoid the blockage of piping system.The research results will provide reference and basis for the application of ternary mixed molten salt in solar energy field.
引文
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[2]彭强,杨晓西,丁静,等.三元硝酸熔盐高温热稳定性实验研究与机理分析[J].化工学报,2013,64(5):1507-1512.
[3]胡宝华,丁静,魏小兰,等.高温熔盐的热物性测试及热稳定性分析[J].无机盐工业,2010,42(1):22-24.
[4]孙李平,吴玉庭,马重芳.太阳能高温蓄热熔融盐优选的实验研究[J].太阳能学报,2008,29(9):1092-1095.
[5]贺万玉.混合氯化熔盐的热物性及腐蚀性实验研究[D].北京:北京建筑大学,2016.
[6]张寅平,刘真泉,王馨,等.低温相变蓄冷材料蓄冷特性实验研究[J].暖通空调,2005,35(10):114-117.
[7]廖敏,丁静,魏小兰,等.高温碳酸熔盐的制备及传热蓄热性质[J].无机盐工业,2008,40(10):15-17.
[8]王立娟.高温混合碳酸盐热物性及腐蚀性实验研究[D].北京:北京建筑大学,2016.
[9]Ren N,Wu Y T,Wang T,et al.Experimental study on optimized composition of mixed carbonate for phase change thermal storage in solar thermal power plant[J].Journal of Thermal Analysis &Calorimetry,2011,104(3):1201-1208.
[10]Peng Q,Wei X,Ding J,et al.High-temperature thermal stability of molten salt materials[J].International Journal of Energy Research,2008,32(12):1164-1174.