文档介绍：钢波纹丝和除去填料,对比三种情况下的各床层气相压降变化,研究表明:操作条件相
同的情况下,随着中间层填料的变换,下层填料干、湿床压降基本不变,中间层填料干、湿床压降减小,上层填料干床压降增大,湿床压降基本不变,说明中间层填料能起到消除气旋的作用,且装填的填料形体阻力越大效果越好。
通过理论分析和合理简化,将多级错流旋转填料床气相压降分为:气体进口、出口阻力压降、以及气体流经上、中、下三层填料床层产生的压降,经推导得出多级错流旋转填料床的气相总压降模型为:
D = i
u2 u2
g + o g
æ H a
+ ç 1 3
H a
+ 2 3
H a
+ 3 3
ö
÷ g g + ( 1 +
2 + 3) g
3
( 2 - 1) + å i g
i
P zr
2
z r o
2
çl 1 f1
è e1
2 f2
e2
l 3 f3 ÷ru2
e3 ø
h h h r gbr r
i=1
judi bei q fi
用塑料鲍尔环填料下的气相压降数据拟合模型系数,得到模型计算结果的误差范围
在 20%以内,说明模型能够较好地反映实验结果以及预测气相压降的大小,可用来指导多级错流旋转填料床改进和工业化应用。
关键词:多级错流旋转填料床,气相压降,塑料鲍尔环,不锈钢波纹丝
Studies on the Gas Pressure Drop Characteristics of Multilevel Cross-flow Rotating Packed Bed
Abstract
The cross-flow rotating packed bed has been widely used in gas absorption, stripping, dust and other unit processes, due to its lots of advantages such as large gas capacity, low pressure drop, high liquid mass transfer coefficient, small size and provincial investment, which is known as the “electronic transistor” in the chemical industry. But the existing structures of cross-flow rotating packed bed are not obvious to strengthen the gas phase mass process, thus it is not suitable to gas-liquid membrane, particularly gas film controlled mass transfer process. Therefore, the multi-stage cross-flow packed bed has been used, the original single-filler was instead by three fillers, namely rotating the upper and lower layers and fixing the middle layer in order to perform a strong airflow disturbance, to strengthen the gas phase mass transfer process.
Gas pressure drop of rotating packed bed is directly related to the size of the gas transport energy consumption in industrial applications. The current models and experimental results on the gas pressure drop of rotating packed bed do not have the versatility, especially for new laboratory cross-flow rotating packed bed. Thus, the structure of packing type and operating parameters on gas pressure drop was studied in this art