纳米粒子掺杂太阳盐复合材料热物性研究

doi:10.19964/j.issn.1006-4990.2021-0427

Abstract

Abstract:

In concentrating solar energy system，molten salt can be regarded as good heat storage material with the characteristics of low cost，safe use and low saturated vapor pressure.Reasonable improvement of its thermal properties can realize the efficient utilization of solar energy.Doping nanoparticles can improve the heat storage and transfer performance of molten salt.In previous work，nano alumina（NA2） was doped into solar salt（SS，60% NaNO₃+40% KNO₃，mass ratio） by high?temperature static melting method to obtain nanofluids（NA2-SS，N2S） with high specific heat capacity.On this basis，nano?graphite powder（GP） and NA2 were simultaneously doped into SS（NA2-GP-SS，N2GS） by the same method.The specific heat and thermal conductivity of the system were measured by differential scanning calorimetry and transient plane heat source method.The results showed that the optimized sample was N2GS-4，its specific heat was 21.79% higher than the original SS，and thermal conductivity was increased by 20.69%，which had excellent thermal stability at high temperature.N2GS-4，as a kind of nitrate based nanocomposite thermal storage material，had a broad application prospect in thermal energy storage system due to its high thermal storage and heat transfer performance.

Key words: solar salt, nanofluids, specific heat capacity, thermal conductivity, nanocomposites

CLC Number:

TQ133.1

ZHANG Yue,WANG Min,LI Jinli,ZHAO Youjing,WANG Huaiyou. Study on thermophysical properties of solar salt composites doped with nanoparticles[J]. Inorganic Chemicals Industry, 2022, 54(5): 54-60.

Figures/Tables 10

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成分	w（NA2）/%	w（GP）/%	m（NaNO₃）/g	m（KNO₃）/g
N2GS-1	0.50	0.05	11.934	7.956 0
N2GS-2	0.50	0.10	11.928	7.952 0
N2GS-3	0.50	0.20	11.916	7.944 0
N2GS-4	0.50	0.30	11.904	7.936 0
N2GS-5	0.50	0.40	11.892	7.928 0
N2GS-6	0.50	0.50	11.880	7.920 0

项目		实际相变潜热/（J·g^-1）	理论相变潜热/（J·g^-1）	变化率/ %
固-固相变	SS	24.47	—	—
	N2S	24.00	24.35	-1.46
	N2GS-4	23.95	24.27	-1.32
固-液相变	SS	125.72	—	—
	N2S	125.73	125.09	+0.51
	N2GS-4	126.29	124.97	+1.06

样品	固-固相变		固-液相变		分解温度/℃
样品	初始温度/℃	终止温度/℃	初始温度/℃	终止温度/℃	分解温度/℃
SS	110.88	119.22	221.49	233.21	579.76
N2S	113.78	119.79	221.69	235.46	590.57
N2GS-4	110.10	117.22	221.81	234.51	600.83

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Inorganic Acid-Base-Salt Committee of CIESC

Study on thermophysical properties of solar salt composites doped with nanoparticles

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