关键词: 错流移动床, 整流子, 颗粒速度, 空腔, 贴壁

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