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Sustainable Energy 2026
基于有限差分法的烟气–熔盐储热系统运行模式转换的瞬态分析
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Abstract:
本文基于有限差分法建立瞬态仿真模型，分析了世界首台烟气–熔盐储热系统的稳态与瞬态特性。在额定工况下，烟气出口、熔盐出口和换热管束的平均稳态温度分别为301.46℃、388.82℃和317.05℃。采用额定烟气流量，启动预热至目标温度，储热启动需要279.9秒，伴热启动需要812.6秒。退出过程中，冷却至200℃所需时间：储热退出为59.8小时，伴热退出为101.3小时；进一步冷却至25℃则分别需要588.8小时和736.0小时。本文为该类系统的设计与运行提供了理论与实践指导。
This paper develops a transient simulation model based on the finite difference method to analyze the steady-state and transient characteristics of the world first flue gas–molten salt thermal storage system. At rated conditions, steady-state temperatures are 301.46？C, 388.82？C, and 317.05？C for the flue gas outlet, molten salt outlet, and average heat exchange tubes bundle, respectively. Using the rated flue gas flow, startup preheating to the target temperatures requires 279.9 s for thermal storage and 812.6 s for thermal preservation. During shutdown, cooling to 200？C takes 59.8 h (thermal storage) and 101.3 h (thermal preservation); cooling further to 25？C requires 588.8 h and 736.0 h, respectively. This work provides theoretical and practical guidance for the design and operation of such systems.
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