The gas–solid flow pattern in a rectangular cross-flow moving bed is simulated by the multiphase particle-in-cell (MP-PIC) model with the Barracuda software. The computed results are verified by the experimental data. In the bed, the actual solid flux generally equals the solid flow rates in the solid feed and discharge tubes. However, these two flow rates are greatly influenced by the air lock and the pressure drop in the solid feed and discharge tubes, namely, the negative and positive pressure gradients, respectively, rather than the traditional opinion that they are merely controlled by the valve openings. The pressure drops in these tubes are calculated by the proposed “common pressure pool with multiple outlets” (CPPMO) and the “common pressure pool” (CPP) methods. It is found that the local gas resistance dominates the pressure drop in the solid discharge tubes, while the gas frictional resistance determines the pressure drop in the solid feed tube. In addition, when the solid flow rate nearly tends to zero in the solid feed tube, the air lock forms. A solid flux equation is then given by considering both the air lock and the pressure drop factors in the cross-flow moving bed.

矩形横流移动床中的气-固流动模式是使用Barracuda软件通过多相单元粒子（MP-PIC）模型进行模拟的。计算结果通过实验数据验证。在床中，实际的固体通量通常等于固体进料和出料管中的固体流速。但是，这两种流速受固体进料管和出料管中的气闸和压降的影响很大，分别是负压梯度和正压梯度，而不是传统观点认为它们仅由阀口控制。这些管中的压降通过建议的“多出口通用压力池”（CPPMO）和“通用压力池”（CPP）方法计算。已经发现，局部气体阻力主导着固体放电管中的压降，而气体摩擦阻力决定了固体进料管中的压降。另外，当固体进料管中的固体流速几乎趋于零时，形成气闸。然后，通过考虑横流移动床中的气锁和压降因素，给出了一个固体通量方程。