高温固体颗粒填充床储热特性数值研究  

Numerical Study on Heat Storage Characteristics of High Temperature Solid Particle Packed Bed

作　　者：赵港归 周月桂[1] ZHAO Ganggui;ZHOU Yuegui(Institute of Thermal Energy Engineering,School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai,China,200240)

机构地区：[1]上海交通大学机械与动力工程学院热能工程研究所,上海200240

出　　处：《热能动力工程》2024年第6期131-138,共8页Journal of Engineering for Thermal Energy and Power

摘　　要：为了研究填充材料的物性以及储热温度对填充床储热系统性能的影响,使用局部非热平衡模型对高温固体颗粒填充床内的气固两相对流换热过程开展了数值模拟,研究了岩石、氧化铝和碳化硅3种不同颗粒材料在储热温度为600,900和1200 K时对蓄放热过程中床层内温度分布、压力损失、蓄热效率、放热功率、循环火用效率的影响。模拟结果表明:碳化硅体积比热容最高,对应的填充床储热系统的蓄热量、蓄热效率、循环火用效率也最高;当储热温度从600 K分别提升到900和1200 K时,蓄热效率分别提升了约2%和3%,放热功率提升一倍和两倍,火用效率提升17%~22%和24%~32%。To find out the influence of physical properties of the filling material and heat storage temperature on the packed bed heat storage system,the convective heat transfer process between gas and solid phases in a high temperature solid particle packed bed was numerically analyzed by using local non-thermal equilibrium model.The effects of different particle materials such as rock,Al2O3 and SiC at different heat storage temperatures of 600 K,900 K and 1200 K on the temperature distribution in the packed bed,air pressure loss,heat charging efficiency,heat discharging power and cycle exergy efficiency in the heat storage and release process were analyzed.The simulation results show that the heat storage capacity,heat charging efficiency and cyclic exergy efficiency of SiC particle packed bed are all the highest due to the largest volumetric specific heat capacity of SiC.Besides,the heat charging efficiency is increased by about 2%and 3%,the heat discharging power is doubled and increased by two times,and the exergy efficiency is increased by 17%-22%and 24%-32%,when the heat storage temperature is increased from 600 K to 900 K and 1200 K,respectively.

关 键 词：储热 高温颗粒 填充床 非热平衡 数值模拟 

分 类 号：TK512.4[动力工程及工程热物理—热能工程]