Numerical and experimental investigation of a new conceptual fluoride salt freeze valve for thorium-based molten salt reactor

作     者：Xin-Yue Jiang Hui-Ju Lu Yu-Shuang Chen Yuan Fu Na-Xiu Wang Xin-Yue Jiang;Hui-Ju Lu;Yu-Shuang Chen;Yuan Fu;Na-Xiu Wang

作者机构：Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China University of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2020年第31卷第2期

页      面：28-41页

核心收录：

学科分类：082703[工学-核技术及应用] 08[工学] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 0702[理学-物理学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(No.91326201) the Strategic Pilot Technology Chinese Academy of Sciences(No.XDA0201002) 

主　　题：Fin Natural convection Freeze valve Fluoride salt Solidification Molten salt reactor 

摘      要：To improve the reliability and reduce energy consumption,a conceptual design of a freeze valve is proposed for the thorium-based molten salt reactor(TMSR)*** were utilized in this new design to enhance heat transfer and realize passive shut-off function,which could not be realized by the previous *** experimental apparatus using the fluoride salt FLiNaK was constructed to conduct a series of preliminary solidification and melting *** addition,the enthalpy-porosity method of ANSYS■Fluent solver was applied to simulate the solidification process of the salt at a specified operating *** distributions of the fluoride salt,solidification/melting time,and frozen plug effect were analyzed under natural convection heat transfer in an open *** calculated salt temperatures exhibited good agreement with the experimental *** results indicated that the range of effective operating temperature is 530-600℃ for the finned freeze *** this study,the ideal set operating temperature of the finned freeze valve was chosen as 560℃ to achieve competent ***,560℃ is additionally the highest set operating temperature for maintaining excellent cooling performance and sustaining deep-frozen condition of the salt *** this set operating temperature,the simulation data indicated that the molten salt in the flat part of the finned freeze valve will completely solidify at 10.5 *** percentage of solid salt in the flat and lower transitional parts of the valve reaches 29.60% in 30.0 ***,the surface temperature of the proposed freeze valve is 11.10% lower compared with that of the TMSR freeze valve at a cooling gas supply of 173 m^3/***,the new freeze valve was proven to be capable of reducing the energy consumption and realizing the passive shut-off function.