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浙江大学学报(工学版)
浙江大学学报(工学版)  2022, Vol. 56 Issue (1): 137-143    DOI: 10.3785/j.issn.1008-973X.2022.01.015
能源工程、机械工程     
储罐地基材料在熔盐泄露后的导热系数研究
王曌文(),周昊*(),罗佳伟,伍其威,岑可法
浙江大学 能源清洁利用国家重点实验室, 浙江 杭州 310027
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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摘要：

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    
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
收稿日期: 2021-03-17 出版日期: 2022-01-05
CLC:  TK 16  
基金资助: 国家自然科学基金资助项目（52036008）
通讯作者: 周昊     E-mail: 3120101339@zju.edu.cn;zhouhao@zju.edu.cn
作者简介: 王曌文（1995—），女，博士，从事太阳能储热、灰烧结孔隙演变研究. orcid.org/0000-0002-3386-2243. E-mail： 3120101339@zju.edu.cn
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引用本文:

王曌文,周昊,罗佳伟,伍其威,岑可法. 储罐地基材料在熔盐泄露后的导热系数研究[J]. 浙江大学学报(工学版), 2022, 56(1): 137-143.

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.

链接本文:

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

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
表 1  太阳盐的热物性及组成[31]
图 1  样品制备的模具装置图
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
表 2  3种工况的粒径质量分数
图 2  3个工况的样品外观图
图 3  Nano voxel 4000系列的XCT实验设备示意图
图 4  各工况样品的三维体重建及孔隙分布
图 5  CT图像的分析处理过程
%
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
表 3  熔盐、陶粒固体和孔隙的体积分数
图 6  样品内孔隙直径的频率分布
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
表 4  3个方向的导热系数模拟值
图 7  沿X方向进行有效热导率模拟时的等温线
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
表 5  2种方法的有效导热系数值对比
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