Numerical study of coarse coal particle breakage in pneumatic conveying
Numerical study of coarse coal particle breakage in pneumatic conveying
复制标题
气力输送中粗煤颗粒破碎的数值研究
DOI：
10.1016/j.partic.2017.07.003
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发表时间：
2018-06-01
期刊：
影响因子：
3.5
通讯作者：
Li, Jianping
中科院分区：
文献类型：
--
作者：
Zhou, Jiawei;Liu, Yu;Li, Jianping
采用计算流体力学和离散元耦合方法，研究了不同管道结构和旋流强度下粗颗粒气力输送的特性。采用平行键法建立了煤粒团聚模型，分析了煤粒破碎过程。数值参数，模拟条件，和模拟结果进行了实验验证。对破碎过程中团聚体总能量变化的分析表明，颗粒总能量的向下波动与颗粒与壁面的碰撞有关，颗粒破碎与能量差呈正相关。分析了颗粒团总能量变化与颗粒破碎的相关性。颗粒完整性随管道弯曲半径呈波动上升趋势，在大多数弯曲半径下随旋流数增加而增加。颗粒破碎的程度与管道弯曲方向和旋流强度不同：在水平弯曲中，弯曲半径和旋流强度主导总能量变化;在垂直弯曲中未观察到这些影响。退出弯曲的颗粒簇的总能量通常与所有条件下的弯曲半径呈正相关，并且与弯曲方向无关。(C)2017中国科学院颗粒学会、过程工程研究所。Elsevier B. V.出版，保留所有权利。
Pneumatic conveying of coarse coal particles with various pipeline configurations and swirling intensities was investigated using a coupled computational fluid dynamics and discrete element method. A particle cluster agglomerated by the parallel-bond method was modeled to analyze the breakage of coarse coal particles. The numerical parameters, simulation conditions, and simulation results were experimentally validated. On analyzing total energy variation in the agglomerate during the breakage process, the results showed that downward fluctuation of the total particle energy was correlated with particle and wall collisions, and particle breakage showed a positive correlation with the energy difference. The correlation between the total energy variation of a particle cluster and particle breakage was also analyzed. Particle integrity presented a fluctuating upward trend with pipe bend radius and increased with swirling number for most bend radii. The degree of particle breakage differed with pipeline bending direction and swirling intensity: in a horizontal bend, the bend radius and swirling intensity dominated the total energy variations; these effects were not observed in a vertical bend. The total energy of the particle cluster exiting a bend was generally positively correlated with the bend radius for all conditions and was independent of bending direction. (C) 2017 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.