随着内环表观气速的增大，整个内环床层密度均降低。
The solids density in the whole internal annular region decreases with increasing the superficial gas velocity.
在分选过程中，流化床内的粉煤将不断积聚，从而导致床层密度的降低。
In the separation process the fine coal in fluidized bed will be continuously accumulated, thus inevitably reducing the density of the bed.
试验结果表明：根据床层密度的变化可以为跳汰机的自动控制提供准确的分层信息。
Experiment result shows that the change of the bed density can offer nicety bed information for the auto-control of jigger.
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