Heat storage characteristics of NaNO3-KNO3-NaNO2 ternary molten salt enhanced by nano-TiO2 at medium temperature

Yihao WANG; Qian XU; Zhongfeng TANG; Peng ZHANG; Xuehui AN; Huiqin YIN; Xiang LI

doi:10.11889/j.0253-3219.2018.hjs.41.060603

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Heat storage characteristics of NaNO₃-KNO₃-NaNO₂ ternary molten salt enhanced by nano-TiO₂ at medium temperature

NUCLEAR ENERGY SCIENCE AND ENGINEERING | 更新时间：2021-05-19

- Heat storage characteristics of NaNO₃-KNO₃-NaNO₂ ternary molten salt enhanced by nano-TiO₂ at medium temperature
- NUCLEAR TECHNIQUES Vol. 41, Issue 6, Article number: 060603(2018)
- 作者机构：
  
  1.上海大学材料科学与工程学院上海 200072
  2.中国科学院上海应用物理研究所嘉定园区上海 201800
- 作者简介：
- 基金信息：
  
  Strategic Priority Research Program of Chinese Academy of Sciences;National Natural Science Foundation of China;National Natural Science Foundation of China;Natural Science Foundation of Shanghai;Qinghai Major Science and Technology Projects
- DOI：10.11889/j.0253-3219.2018.hjs.41.060603
  CLC： TL99
- Received：20 November 2017，
  
  Revised：19 January 2018，
  
  Published：10 June 2018
- 稿件说明：
移动端阅览
Yihao WANG, Qian XU, Zhongfeng TANG, et al. Heat storage characteristics of NaNO₃-KNO₃-NaNO₂ ternary molten salt enhanced by nano-TiO₂ at medium temperature[J]. Nuclear techniques, 2018, 41(6): 060603
DOI：

Yihao WANG, Qian XU, Zhongfeng TANG, et al. Heat storage characteristics of NaNO₃-KNO₃-NaNO₂ ternary molten salt enhanced by nano-TiO₂ at medium temperature[J]. Nuclear techniques, 2018, 41(6): 060603 DOI： 10.11889/j.0253-3219.2018.hjs.41.060603.

摘要

NaNO

-KNO

-NaNO

（Hitec）熔盐作为一种理想的中高温传储热介质，未来有望在太阳能热利用等领域展开广泛应用。但其作为中温储热介质而言，其比热和导热性能相对较低，若能提高其比热和导热系数无疑将在太阳能热利用等实际应用中具有很重要的意义。采用水法技术制备了纳米TiO

/Hitec熔盐复合储热介质，采用不同的表征技术研究了不同粒径、不同添加量纳米TiO

颗粒对复合储热介质的比热、导热系数和热稳定性的影响。结果表明：与Hitec熔盐相比，纳米TiO

颗粒明显提高了熔盐复合储热介质的储热特性。其中25 nm粒径，添加质量分数为0.062 5%纳米TiO

对Hitec熔盐复合储热介质的比热（提高12%）和导热系数（增大15%）增强显著，同时热稳定性也得到改善。

Abstract

Background

NaNO

-KNO

-NaNO

(7%-53%-40% in mass fraction) Hitec molten salt is considered as one of the promising candidate materials for heat transfer and thermal storage media in concentrated solar power (CSP)

due to wide work temperature

low vapor pressure and so on. However

the specific thermal capacity of molten salt is relatively low. It will be significant in practical applications by improving the species thermal capacity with some addition into molten salt.

Purpose

The study aims to investigate the effect of various size (25 nm

40 nm and 100 nm) and addition amount (0.062 5%

0.5% and 1% in mass fraction) of TiO

nanoparticle on the thermal storage properties of Hitec molten salt.

Methods

Differential scanning calorimetry

thermal gravity and laser flash analyzer were used to determine the effect of TiO

nanoparticle on the species heat capacity

thermal stability and thermal conductivity of Hitec.

Results & Conclusion

The TiO

nanoparticle improves the thermal storage properties of Hitec

compared to origin Hitec. Furthermore

0.062 5% (mass fraction) addition of TiO

nanoparticle with 25 nm size showed the best enhancement of the thermal storage properties of Hitec

where the specific heat capacity and thermal conductivity increased by 12% and 15%

respectively. Moreover

the upper working temperature of NaNO

-KNO

-NaNO

increased a lot.

关键词

Keywords

references

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