光热电站熔融盐储热罐冷却速率研究  

Research on Cooling Rate of Molten Salt Heat Storage Tank in Concentrating Solar Power Plant

作　　者：王渊静 胡松 张燕平[1] WANG Yuanjing;HU Song;ZHANG Yanping(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,Hubei Province,China)

机构地区：[1]华中科技大学能源与动力工程学院,湖北省武汉市430074

出　　处：《中国电机工程学报》2023年第6期2130-2141,共12页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2018YFE0127500)。

摘　　要：开展熔融盐冷却速率研究可为储热罐在不同情景下的高效利用及运行策略的选择提供参考。熔融盐冷却速率受到其热损失的直接影响,该文通过使用Modelica语言建立Andasol-1电站50MW储热罐热损失计算模型,探究熔融盐热损失变化规律,依此提出对罐体不同位置增加电加热装置的多种方案,并进行仿真分析和储热罐(火用)效率对比。结果表明:熔融盐与罐体底部对流换热损失占比最大,罐壁温度会通过与熔融盐对流换热和辐射换热的方式,对熔融盐热损失产生较大的影响。与传统的电加热方式相比,提升罐内气体温度不仅能够有效减缓熔融盐冷却速率,还可以使熔融盐热损失有明显的下降。The study of molten salt cooling rate can provide a reference for the efficient utilization of heat storage tanks under different scenarios and the selection of operating strategies.The cooling rate of molten salt is directly affected by its heat loss.The heat loss calculation model for 50MW molten salt heat storage tank is established by using Modelica language.The change of molten salt is explored,various option of adding electric heating devices to different locations of the tank is proposed,the simulation analysis and comparison of the efficiency of the heat storage tank are conducted.The results show that,the convective heat loss between the molten salt and the bottom of the tank accounts for the most significant proportion,the tank wall temperatures have a large effect on the molten salt heat loss through convective and radiant heat transfer with the molten salt.Compared with the traditional electric heating method,raising the gas temperature inside the tank can not only effectively slow down the cooling rate of the molten salt,but also make a significant reduction in the molten salt heat loss.

关 键 词：熔融盐储热 热损失分析 冷却速率 MODELICA 

分 类 号：TK02[动力工程及工程热物理]