熔盐单罐蓄热过程流动及换热特性数值研究  

Numerical Study on Flow and Heat Transfer Characteristics of the Molten Salt Single Tank Heat Storage Process

作　　者：梁五洲 武宾 刘众元 李勇 张嘉杰[2] 马素霞[2] LIANG Wuzhou;WU Bin;LIU Zhongyuan;LI Yong;ZHANG Jiajie;MA Suxia(State Grid Shanxi Electric Power Company Electric Power Research Institute,Taiyuan 030021,P.R.China;College of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,P.R.China)

机构地区：[1]国网山西省电力公司电力科学研究院,太原030021 [2]太原理工大学电气与动力工程学院,太原030024

出　　处：《应用数学和力学》2025年第3期340-352,共13页Applied Mathematics and Mechanics

基　　金：国网山西省电力公司科技项目(520530230026)。

摘　　要：针对储热技术在新能源消纳领域的应用背景,该文设计了一种储换热一体式熔盐单罐,通过数值模拟研究了单罐蓄热特性及熔盐在蓄热过程中的传热规律,探讨了螺旋管间距、布置位置等对蓄热过程的影响规律.研究结果表明:熔盐温度在蓄热过程中逐渐上升,密度减小,使得熔盐在罐内形成自然对流,螺旋管结构的布置形式使得罐内熔盐流场呈现三处旋涡;当螺旋管布置位置接近罐内底部时,由于底部熔盐密度较小,自然对流更为强烈,蓄热完成时间相对于布置在罐内中上部时可缩短34.1%;螺旋管内径的增大使得换热面积增加,加快了熔盐升温速率;螺旋管间距的增大会使熔盐加热范围变大,小幅度缩短蓄热完成时间;下进上出的进汽方式由于进口位置更靠近底部,使得罐内熔盐自然对流更强.Aimed at the application of heat storage technology in the field of new energy consumption,a molten salt single tank integrating the heat storage and the heat exchange was proposed.The single tank heat storage characteristics and molten salt heat transfer laws during the heat storage process were numerically simulated and analyzed.The effects of spiral tube spacings and inlet/outlet layout positions on the heat storage process were discussed.The results show that,the molten salt temperature increases gradually in the heat storage process,while the molten salt density decreases and the natural convection forms in the tank.The spiral structure of the tube makes 3 vortices be formed in the flow field of the molten salt.With the spiral tube positioned at the bottom of the tank,the heat storage completion time can be shortened by 34.1%due to a stronger natural convection,compared with the cases at the center and the top of the tank.The increase of the spiral tube diameter may enlarge the heat transfer area and speed up the heating rate of the molten salt.With the increase of the spiral tube spacing,the heating range of the molten salt will be larger,and the heat storage completion time will be shortened slightly.The natural convection of the molten salt is stronger in the inlet-down and outlet-up case since the inlet position is closer to the tank bottom.

关 键 词：熔盐单罐 蓄热完成时间 熔盐温度 自然对流 螺旋管 

分 类 号：TK02[动力工程及工程热物理]