Abstract:

It does exist that some of abnormal phenomena, such as cavities and particle flow variations from plug flow, are inevitable in cross-flow moving bed operations. In terms of the issues related to the abnormal operation phenomena, the experiment was conducted through a large cold model experimental facility consisting of a φ600 mm×1300 mm semi-conical and semi-cylindrical radial flow moving bed. It showed that, the critical velocity of forming cavity can be effectively increased through introducing coarse additive particles, hence the low elasticity of operation can be improved in cross-flow moving bed to some extent. Both theoretical analysis and experimental results showed that, the inhomogeneity of particle flow can be effectively improved by introducing coarse additive particles.

Key words: moving bed, cavity, granular materials, flow

摘要：

针对错流移动床存在的空腔和颗粒流动偏离平推流的不正常操作问题。在一套φ600 mm×1300 mm半圆锥形和柱形错流移动床大型冷模实验装置上，借助于大颗粒助剂的引入有效提高了错流移动床出现空腔的临界速度，解决了错流移动床操作弹性低的问题。理论分析和实验结果表明，混入适量的大颗粒助剂可使颗粒流动不均匀性得到明显改善。

关键词: 移动床, 空腔, 颗粒物料, 流动