热力发电2025，Vol.54Issue(10)：41-50,10.DOI:10.19666/j.rlfd.202412270
单罐储热系统充放热循环过程动态热特性及力学性能模拟
Dynamic thermal and stress characteristics of a single tank thermal storage system during continuous charging and discharging cycling process
摘要
Abstract
The heat transfer characteristics and safety of a single tank thermal storage system during charging and discharging cycle are important indicators affecting the performance of the thermal storage tank.By coupling finite volume method and finite element method,a comprehensive model of a multi-layer wall structure molten salt single tank system is established,and the effects of inlet flow velocity and inlet/outlet temperature difference on the dynamic thermal characteristics and mechanical properties of the thermal storage tank during continuous charging and discharging cycling process are explored.The results indicate that,increasing the inlet flow rate will reduce the heat storage and improve the thermal efficiency,but will also increase the equivalent stress on the tank wall.Increasing the temperature difference between the inlet and outlet will increase the heat storage and reduce the thermal efficiency,and also increase the equivalent stress on the tank wall.To ensure the heat storage and thermal efficiency of the single tank heat storage system,as well as the safety of the system,for the single tank system with a heat storage capacity of 40 MW·h,the inlet flow rate of molten salt should be controlled within 0.002 60～0.003 46 m/s,and the temperature difference between the inlet and outlet of molten salt needs to be controlled within 200～250 K.关键词
单罐储热/熔融盐/斜温层/热效率/热应力Key words
single-tank thermal energy storage/molten salt/thermal gradient layer/thermal efficiency/thermal stress引用本文复制引用
梅欣,李阳海,徐万兵,欧阳钰明,张燕平..单罐储热系统充放热循环过程动态热特性及力学性能模拟[J].热力发电,2025,54(10):41-50,10.基金项目
国家电网公司总部科技项目(4000-202458076A-1-1-ZN)Technology Project of State Grid Corporation of China(4000-202458076A-1-1-ZN) （4000-202458076A-1-1-ZN）
