搅拌调浆机制的固-液悬浮特性

Solid-liquid suspension characteristics of stirred pulp-mixing mechanism

通过固-液两相试验来模拟实际调浆过程,根据不同搅拌机制下物料在槽内的分布规律,总结累积浓度方差、区间浓度方差、离底悬浮能力以及有效作用范围等参数及概念来表征物料的悬浮特性,并以此对典型轴流式流场与径流式流场作用于两相介质的功效进行系统的分析,对常用附件(导流筒、挡板)的添加对悬浮效果的影响进行了总结。指出物料悬浮过程是由离底悬浮能力与有效作用范围共同决定的过程。同样操作条件下,物料悬浮水平较低时,搅拌体系的悬浮能力主要由离底悬浮能力决定;在实现较好离底悬浮时,有效作用范围的影响逐渐占据主导地位。

By solid-liquid two-phase experiments,the practical pulp-mixing process was simulated.Basing on the materiel distribution regularity in tank under the effects of different stirred mechanism,the parameters and concepts of cumulative concentration variance,interval concentration variance,just-suspended capacity and effective range were summarized to characterize the suspension characteristics of materiel,with which systematic analysis on the effect of typical axial flow field and radial flow field＇s role in two-phase medium was made,while the effect of the addition of common accessories was summarized.It is pointed out that material suspension is a process decided by just-suspended capacity and effect range.Under the same operation condition,suspension capacity of stirred system is decided by just-suspended capacity when the suspension level is low,while effect range gradually becomes dominant when good just-suspended status has been achieved.