摘要
当散体颗粒在负压差移动床立管下端连接的锥形料斗中流落时，对料斗上方和气室中压力信号波动分别加以采集，经过快速傅立叶交换处理，得出：在压力和气泡控制区，料斗上方和气室中压力波动特征表现出在低频区有较小的波动幅值；而在气拴控制区内，料斗上方和气室中压力波动特征不仅在低频区有较高的幅值，而且两者压力波动信号相位相差π。这些压力波动特征可以用来监测料斗中散体颗粒的流落状态。
In this paper, it was concluded that as the pressure gradient in the standpipe in-creases, the volume-average pressure gradient in the hopper will increase in the pressureregime, decrease in the bubble regime, becomes uniform in the plug regime, i- e.,and increases in the powder-sealing regime.The effect of pressure drop in hopper on the average mass flow rate was discussed in de-tail. Particularly in plug regime, the average mass flow rate could be predicted by Beverlooequation. Based on Beverloo equation, the correlation for the average mass flow rate in thepressure regime and bubble regime were given. A new valve, called Hopper-Valve, is suggest-ed for controlling gas solids flow from standpipe with negative pressure gradient.
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
1998年第2期164-169,共6页
Chemical Reaction Engineering and Technology
基金
中国石化总公司赞助项目。
关键词
负压差
料斗
移动床
立管
压力波动
Negative pressure drop, Hopper, Orifice, Average mass flow rate, Movingbed standpipe
