Application of three-dimensional full-loop CFD simulation in circulating fluidized bed combustion reactors – A review
Application of three-dimensional full-loop CFD simulation in circulating fluidized bed combustion reactors – A review
复制标题
循环流化床燃烧反应器的三维全回路CFD模拟
DOI：
10.1016/j.powtec.2022.117181
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发表时间：
2022-02
影响因子：
5.2
通讯作者：
Q. Tu;Haigang Wang;R. Ocone
中科院分区：
文献类型：
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作者：
Q. Tu;Haigang Wang;R. Ocone
循环流化床（CFB）由于其燃料灵活性和排放控制的有效性而在煤炭燃烧和气化工业中得到了广泛的应用。然而，由于缺乏对固有的复杂的气固流动的流体动力学行为的深刻理解，循环流化床的设计，优化和放大是欠发达的。计算流体动力学（CFD）已成为研究循环流化床（CFB）的一种很有前途的方法，包括理解气固流化特性的复杂流体力学，探索气固流动的内在机理，以及优化CFB的设计和放大。本文综述了三维全回路CFD模拟在冷态循环流化床中的应用。首先，详细讨论了计算流体力学模型以及与相间阻力模型和湍流模型相关的一些关键问题。其次，研究了循环流化床内不同流型和不同部件的流动特性，提升管、提升管出口、旋风分离器、立管和环封。大部分CFD模拟结果都得到了现有实验数据的验证，但要对循环流化床进行准确的CFD模拟，仍存在许多问题需要解决。最后，指出了循环流化床全回路CFD模拟的未来挑战和发展趋势。这一全面的综述将为循环流化床锅炉的设计、优化和放大提供有价值的信息。
Circulating fluidized beds (CFBs) have been widely applied in coal combustion and gasification industry due to their excellent performance in terms of fuel flexibility and effectiveness of emission control. However, due to the lack of a deep understanding of the inherently complex gas-solid flow hydrodynamic behavior, the design, optimization, and scale-up of CFBs are underdeveloped. Computational fluid dynamics (CFD) has become as a promising method to study CFBs, including understanding the complex hydrodynamics of gas-solid fluidization characteristics, exploring the underlying mechanism of gas-solid flow, and optimizing the design of CFB as well as scaling up. This paper reviews the application of three-dimensional full-loop CFD simulation in “cold” flow CFBs. Firstly, detailed CFD models and some key issues related with the interphase drag model as well as turbulence models are discussed. Secondly, flow dynamic characteristics in different flow regimes and components in CFBs, i.e., riser, riser exit, cyclone, standpipe and loop-seal, are reviewed and discussed. Most of the CFD simulation results are validated with available experimental data, but there are still lots of problems existed and needs to be solved for the accurate CFD simulation of CFBs. Finally, the future challenges and development trends in the full-loop CFD simulation for CFBs are highlighted. This comprehensive review will provide valuable information for the design, optimization and scale-up of CFBs.