Influence of particle shape on microstructure and heat transfer characteristics in blast furnace raceway with CFD-DEM approach
Influence of particle shape on microstructure and heat transfer characteristics in blast furnace raceway with CFD-DEM approach
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CFD-DEM方法研究颗粒形状对高炉滚道微观结构和传热特性的影响
DOI：
10.1016/j.powtec.2019.08.021
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发表时间：
2020-02
影响因子：
5.2
通讯作者：
Shengqiang Jiang
中科院分区：
文献类型：
--
作者：
Guangchao Wei;Hao Zhang;Xizhong An;Shengqiang Jiang
采用计算流体力学和离散元耦合方法（CFD-DEM）模拟研究了颗粒形状对高炉回旋区微观结构和传热特性的影响。本工作涉及球形和非球形颗粒，包括四面体和八面体形状。实验结果验证了耦合方法的适用性和组合球法（CSM）研究动力学和热力学行为的准确性。然后，颗粒形状的回旋区的形成，显微组织和颗粒温度演变的影响进行了全面的探索。数值结果表明，四面体颗粒系统具有较强的互锁效率，从而导致较小的回旋区尺寸。此外，该系统的温度不均匀性能比其他两种情况下更显着。然而，八面体颗粒系统的回旋区尺寸较大，颗粒平均温度也较高;同时，在相同入口速度下，八面体颗粒系统比四面体颗粒系统具有更强的旋转动能，但形成和维持回旋区所需的阻力较小。这些研究结果有助于深入了解高炉回旋区的微观结构和传热特性。
Coupled computational fluid dynamics and discrete element method (CFD-DEM) simulations are conducted to investigate the influence of particle shape on microstructure and heat transfer characteristics in a blast furnace (BF) raceway. Spherical and non-spherical particles including tetrahedron-like and octahedron-like shapes are involved in this work. The applicability of the coupled approach and the accuracy of combined sphere method (CSM) to investigate the kinetic and thermodynamic behaviors are validated firstly based on the experimental results. Then, the influences of particle shape on raceway formation, microstructure, and particle temperature evolution are comprehensively explored. The numerical results show that the tetrahedron-like particle system presents a relatively stronger interlocking efficiency and thus leads to a smaller raceway size. Additionally, the non-uniform performance of temperature in this system is more striking than the other two cases. However, the bigger raceway size exists in the octahedron-like particle system and the average particle temperature is also higher than other cases; meanwhile, this system possesses more powerful rotational kinetic energy but lower drag force required to form and maintain the raceway than tetrahedron-like system under the same inlet velocity. These findings could be beneficial for the in-depth understanding of microstructure and heat transfer characteristics within a BF raceway.
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