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浙江大学学报(工学版)
Journal of ZheJiang University (Engineering Science)  2022, Vol. 56 Issue (1): 137-143    DOI: 10.3785/j.issn.1008-973X.2022.01.015
    
Research on thermal conductivity of storage tank foundation materials after molten salt leakage
Zhao-wen WANG(),Hao ZHOU*(),Jia-wei LUO,Qi-wei WU,Ke-fa CEN
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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Abstract  

The thermal properties of accumulated ceramsites in the storage tank foundation after molten salt leakage were analyzed by the finite element simulation based on real three-dimensional volume reconstruction from XCT in order to model the tank structure design and heat storage system of solar power plant. The working conditions with three different particle size ratios were analyzed. The microstructure was characterized while the thermal conductivity was estimated. Influences of molten salt leakage on thermal physical properties of accumulated ceramsites in the foundation were analyzed. The porosity of the accumulated ceramsites after molten salt leakage under three working conditions was 30.1%, 30.7% and 29.9% respectively, and the finite element simulation results of thermal conductivity were 0.505, 0.476 and 0.478 W/(m·K). The porosity was reduced by more than 50% and the thermal conductivity increased by 4.0 to 5.0 times after molten salt leakage.

Key words： thermal conductivity      X-ray computed microtomography      molten salt tank foundation      three-phase threshold segmentation      molten salt leakage     
Received: 17 March 2021      Published: 05 January 2022
CLC:  TK 16  
Fund:  国家自然科学基金资助项目（52036008）
Corresponding Authors: Hao ZHOU     E-mail: 3120101339@zju.edu.cn;zhouhao@zju.edu.cn
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Zhao-wen WANG
Hao ZHOU
Jia-wei LUO
Qi-wei WU
Ke-fa CEN
Cite this article:

Zhao-wen WANG,Hao ZHOU,Jia-wei LUO,Qi-wei WU,Ke-fa CEN. Research on thermal conductivity of storage tank foundation materials after molten salt leakage. Journal of ZheJiang University (Engineering Science), 2022, 56(1): 137-143.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.01.015     OR     https://www.zjujournals.com/eng/Y2022/V56/I1/137


储罐地基材料在熔盐泄露后的导热系数研究

为了对太阳能发电厂储罐结构设计和储热系统进行建模，基于XCT技术，在真实三维体重建的基础上，利用有限元模拟的方法，研究3种不同粒径配比的储罐基础内的堆积陶粒在熔盐泄露后的热物性，分析微观结构并估算导热系数. 探究熔盐泄露后对熔盐罐地基内堆积陶粒热物性的影响. 3种工况下熔盐泄露后的堆积陶粒的孔隙体积分数分别为30.1%、30.7%和29.9%，导热系数的有限元模拟结果分别为0.505、0.476和0.478 W/(m·K). 熔盐泄露后，孔隙体积分数降低了50%以上，导热系数提高了4.0~5.0倍.


关键词： 导热系数,  X射线计算机显微断层成像,  熔盐罐基础,  三相阈值分割,  熔盐泄漏 
项目 t/℃
c/(J·kg?1·K?1) 0.172t + 1443.0
ρ/(kg·m?3) ?0.636t + 2090.0
λ/(W·m?1·K?1) 0.00019t + 0.44
wN/% 99.6
wCl/% 0.02
wim/% 0.01
wMg/% 0.001
Tab.1 Thermophysical properties and components of solar salt
Fig.1 Schematic diagram of mould device for sample preparation
工况 wc/%
d＜5.6 mm d = 5.6~8.0 mm d = 8.0~11.2 mm d＞11.2 mm
工况 1 [9] 39 36 15 10
工况 2 [8] 24 49 11 16
工况 3 — — — 100
Tab.2 Mass fraction of particle diameters for ceramsites in experimental cases
Fig.2 Samples for three cases with different particle diameters
Fig.3 Schematic diagram of Nano voxel 4000 series XCT experimental equipment
Fig.4 Three-dimensional reconstruction and pore distribution of samples for three cases
Fig.5 Processing and analysis process of CT images
%
工况 φs φc φp
1 40.4 29.5 30.1
2 45.3 24.0 30.7
3 48.1 22.0 29.9
Tab.3 Volume fraction of salt, ceramisite and pore
Fig.6 Frequency distribution of pore diameter in samples
W/(m·K)
工况 λs
X Y Z 平均值 标准差
1 0.509 0.504 0.503 0.505 0.003
2 0.480 0.475 0.474 0.476 0.003
3 0.476 0.479 0.480 0.478 0.002
Tab.4 Simulated values of heat conductivity in three directions
Fig.7 Isotherm curve of effective thermal conductivity simulation along X direction
工况 φp/% λs/
（W·m?1·K?1） 		λm/
（W·m?1·K?1） 		σ/%
1 30.1 0.505 0.496 1.8
2 30.7 0.476 0.473 0.6
3 29.9 0.478 0.483 1.0
Tab.5 
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