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.

使用耦合的计算流体动力学和离散元方法研究了具有各种管道配置和涡旋强度的粗煤粉的气力输送。对通过平行结合法团聚的颗粒团进行建模，以分析粗煤颗粒的破裂。数值参数，仿真条件和仿真结果均经过实验验证。在分析破碎过程中团聚体的总能量变化时，结果表明，总颗粒能的向下波动与颗粒和壁的碰撞有关，而颗粒破碎与能量差呈正相关。还分析了粒子团的总能量变化与粒子破裂之间的相关性。对于大多数弯曲半径，颗粒完整性随管道弯曲半径呈现出波动的上升趋势，并随着旋涡数的增加而增加。颗粒破裂的程度随管道弯曲方向和旋流强度的不同而不同：在水平弯曲中，弯曲半径和旋流强度决定了总的能量变化。在垂直弯​​曲中未观察到这些影响。在所有情况下，离开弯曲的粒子簇的总能量通常与弯曲半径呈正相关，并且与弯曲方向无关。在垂直弯​​曲中未观察到这些影响。在所有情况下，离开弯曲的粒子簇的总能量通常与弯曲半径呈正相关，并且与弯曲方向无关。在垂直弯​​曲中未观察到这些影响。在所有情况下，离开弯曲的粒子簇的总能量通常与弯曲半径呈正相关，并且与弯曲方向无关。