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作 者:宋艳梅 杨豫森 王欣然 杜藏宝 杨晓峰 陈伟雄[2] 孙林 SONG Yanmei;YANG Yusen;WANG Xinran;DU Cangbao;YANG Xiaofeng;CHEN Weixiong;SUN Lin(China Huaneng Group Clean Energy Research Institute,Beijing 102209,China;State Key Laboratory of Multiphase Flow in Power Engineering(Xi'an Jiaotong University),Xi'an 710049,Shaanxi China)
机构地区:[1]中国华能集团清洁能源技术研究院有限公司,北京102209 [2]动力工程多相流国家重点实验室(西安交通大学),陕西西安710049
出 处:《电力科技与环保》2025年第2期217-228,共12页Electric Power Technology and Environmental Protection
基 金:中国华能集团有限公司总部科技项目(HNKJ22-HF31-01)。
摘 要:【目的】为优化燃气联合循环机组的调峰性能,解决机组日开夜停模式下的夜间工业蒸汽供应问题,并实现能源梯级利用与热电联产。【方法】本文设计一种新型空气对流耦合耐火砖固体蓄热系统,通过建立空气对流耦合耐火砖蓄热的数值仿真模型,分析预热段、蒸发段和过热段的相变换热、对流传热及导热特性;采用计算流体动力学模拟结合实验验证,探究蓄热体在蓄/放热过程中热扩散的变化趋势与差异,并利用网格无关性验证确保模拟精度。【结果】研究表明,蓄热系统单元在4 h内储热和放热量均达到80%以上,最大平均储热速率和放热速率分别为15.9 kW/m^(3)与22.0 kW/m^(3);能够快速高效地储存蒸汽热量和将热量释放给蒸汽,实验与模拟结果吻合良好,验证了技术可行性。释能阶段的传热温压显著高于储能阶段,表明系统释能效率更高。【结论】该装置可高效存储和释放蒸汽热量,提升燃气机组调峰能力,减少对燃气锅炉的依赖,同时通过储热实现深度调峰与热能稳定供应,可有效的解决负荷过低对机组运行安全性的影响,具有显著的经济效益与应用价值。[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/m^(3)and 22.0 kW/m^(3),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
分 类 号:TK011[动力工程及工程热物理]
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