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在气体吸附分离过程中,吸附床内气体流动过程实质上是一个变质量流动过程.借助二维模型对吸附床内气体的速度分布进行了研究,在模型中考虑了吸附引起的质量变化和床层的径向空隙率的分布.结果表明:(1)多孔介质本身对流动有着重整作用,使流动趋于均匀分布,但是进口端的吸附剂受入口效应的影响较大,在此区域速度呈W形分布,部分区域达到流化状态;(2)在吸附步骤,速度在传质区有着较大的变化,在其他的三个步骤内,速度沿吸附剂床层近似线性变化;(3)降压步骤中,床中气体速度较高,对颗粒冲击较大,易引起摩擦和粉化,应合理控制降压速率;(4)气体吸附引起的质量变化对压力和速度有着重要影响,不能轻易忽略.
During gas adsorption and separation, the gas flow in the adsorbent bed is essentially a variable mass flow process.The velocity distribution of the gas in the adsorbent bed is studied by means of a two-dimensional model, taking into account the mass changes caused by the adsorption and the bed The results show that: (1) The porous medium itself has a reformation effect on the flow and the flow tends to be evenly distributed, but the inlet side adsorbent is greatly influenced by the inlet effect, and the velocity in this region (2) In the adsorption step, the velocity has a great change in the mass transfer zone. In the other three steps, the velocity changes approximately linearly along the adsorbent bed. (3) In the depressurization step, the gas velocity in the bed is high, the impact on the particles is large, and friction and chalking easily occur. The depressurization rate should be controlled reasonably. (4) The mass change caused by gas adsorption has an important influence on the pressure and the velocity. Easy to ignore.