电力科技与环保2025，Vol.41Issue(2)：217-228,12.DOI:10.19944/j.eptep.1674-8069.2025.02.005
空气对流耦合耐火砖蓄热传热特性研究
Heat transfer characteristics of a new refractory brick thermal storage system coupled with air convection
摘要
Abstract
[Objective]In this paper,a new type of refractory brick solid heat storage system is designed to optimize the peaking performance of gas-fired combined cycle units,to solve the problem of nighttime industrial steam supply under the mode of daytime on/nighttime off of the units,and to realize the energy laddering utilization and cogeneration.[Methods]By establishing a numerical simulation model of steam-coupled refractory bricks thermal storage,the phase change heat transfer are analyzed,convective heat transfer and thermal conductivity characteristics of the preheat,evaporation and superheat sections.Computational fluid dynamics simulation is combined with experimental validation to investigate the trends and differences of thermal diffusion in the heat storage/exothermic process of the heat storage body.The mesh-independence validation is applied to ensure the accuracy of the simulation.[Results]The heat storage system unit reaches more than 80%of heat storage and heat release within 4 h.The maximum average heat storage rate and heat release rate are 15.9 kW/m³ and 22.0 kW/m³,respectively.It can quickly and efficiently store the heat of the steam and release the heat to the steam,and the experimental and simulation results are in good agreement with the simulation results,which verifies the feasibility of the technology.The heat transfer temperature and pressure in the energy release stage is significantly higher than that in the energy storage stage,indicating that the system is more efficient in releasing energy.[Conclusion]The device can efficiently store and release steam heat,enhance the peak shifting capability of gas-fired units,reduce the dependence on gas boilers,and at the same time realize deep peak shifting and stable supply of thermal energy through heat storage,which can effectively solve the impact of low load of coal-fired boilers on the operational safety of the units,and it has significant economic benefits and popularization value.关键词
固体蓄热/耐火砖/流体动力学模拟/储热速率/放热特性Key words
solid thermal storage/refractory brick/CFD simulation/heat transfer rate/heat release characteristics分类
能源与动力引用本文复制引用
宋艳梅,杨豫森,王欣然,杜藏宝,杨晓峰,陈伟雄,孙林..空气对流耦合耐火砖蓄热传热特性研究[J].电力科技与环保,2025,41(2):217-228,12.基金项目
中国华能集团有限公司总部科技项目(HNKJ22-HF31-01) （HNKJ22-HF31-01）
