摘要
本文给出利用料斗中体均压力梯度与立管压力梯度的关系判别压力控制区、气泡控制区、气栓控制区和悬料区的方法。在气栓控制区，料斗中体均压力梯度有如下关系[（一dP／dz）]hplug=0．241pbmfg而且，散体颗粒平均质量流率可以用Beverloo方程来预测。在此基础上，讨论了料斗中体均压力梯度对散体颗粒通过孔口平均质量流率的影响，并给出预测平均质量流率的关联式。给出一种新的立管约束条件，即料斗阀的设计方法和操作范围。
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158-163,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
孔口
立管
移动床
颗粒流动
Negative pressure drop
Hopper
Orifice
Average mass flow rate
Movingbed standpipe
