Experimental Investigation and X-Ray Computed Microtomography Simulation on Thermal Physical Properties of Foundation Materials after Molten Salt Leakage in the Storage Tank  

作　　者：WANG Zhaowen ZHOU Hao LUO Jiawei LI Yawei FANG Hao LIU Tianxiao 

机构地区：[1]State Key Laboratory of Clean Energy Utilization,Institute for Thermal Power Engineering,Zhejiang University,Hangzhou,310027,China

出　　处：《Journal of Thermal Science》2024年第2期591-601,共11页热科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (52036008)。

摘　　要：This paper studied the thermal physical properties of foundation materials in the molten salt tank of thermal energy storage system after molten salt leakage by Transient plane source experiment and X-ray computed microtomography simulation methods.The microstructure,thermal properties and pressure resistance with different particle diameters were addressed.The measured heat conductivities from Transient plane source experiment for three cases are 0.49 W/(m·K),0.48 W/(m·K),and 0.51 W/(m·K),and the porosity is 30.1%,30.7%,and 31.2% respectively.The heat conductivity simulating results of three cases are 0.471 W/(m·K),0.482W/(m·K),and 0.513 W/(m·K).The ratio of difference between the results of simulation and Transient plane source measurement is as low as 1.2%,verifying the reliability of experimental and simulation results to a certain degree.Compared with the heat conductivity of 0.097-0.129 W/(m·K) and porosity of 71.6%-78.9% without leaking salt,the porosity is reduced by more than 50% while the heat conductivity increased by 4 to 5 times after molten salt leakage.This significant increase in heat conductivity has a great impact on security operation,structure design,and modeling of the tank foundation for solar power plants.

关 键 词：heat conductivity X-ray computed microtomography foundation materials three-phase threshold algorithm molten salt leakage 

分 类 号：TK11[动力工程及工程热物理—热能工程] TB302[一般工业技术—材料科学与工程]