Abstract: The effects of internals on particle behaviors were investigated in a rectangular moving bed with gas cross-flow by changing the position and size of internals. Experimental results show that the velocity of particles near upstream face is faster than that of particles near downstream face in the condition of gas cross-flow. And it is possible that particles move at the same velocity under a certain gas velocity if an internal is located in a suitable horizontal position. As compared with an apparatus without an internal, location of internal could suspend the formation of cavity and decrease cavity size while it reduces critical value of pinning. To describe the cavity size and critical condition of pinning, it is assumed that the particle layer was divided into two virtual channels, whose widths were decided by the horizontal position of the internal. Using different widths of the two virtual channels, mathematical models for cavity size and critical condition of pinning were established respectively. The model data agreed with the experimental results.

Key words: cross-flow moving bed, internal, particle flow, cavity, pinning

摘要： 在矩形错流移动床中考察了整流子对移动床内颗粒移动、空腔、贴壁等现象的影响. 实验结果表明，在有错流的条件下，床层内颗粒下移速度表现为近上游面的颗粒快于近下游面的颗粒，适当调整整流子位置有可能使床层内颗粒在某一气速下以几乎相同的速度下移. 与无整流子的装置相比，整流子的设置能推迟移动床空腔的生成并减小空腔尺寸，其横向位置离上游面越远对空腔影响越小；但设置整流子将降低错流移动床的贴壁临界值，其横向位置离上游面越远对贴壁影响越大. 为定量描述空腔尺寸和贴壁临界值，将床层简化为由整流子中心位置决定的2个虚拟流道，并分别建立了数学模型，模型计算值与实验值大致相符.

关键词: 错流移动床, 整流子, 颗粒速度, 空腔, 贴壁