旋转填充床端效应区分布范围的研究

A study of the end effect area of a rotating packed bed

本文假设液体射流在端效应区内的流动过程动量守恒,建立并简化N-S方程,经过计算得到了端效应区厚度与射流速度和转子转速的关系。关系式显示,端效应区的厚度与射流速度成正比,与转子转速成反比。通过墨迹实验,观察不同的填料层厚度下射流被捕获的情况,进而判断端效应区的范围。实验结果与模拟结果的一致性较好,模拟计算的最大误差不超过10%。以CO2(10%)+N2(90%)和NaOH溶液为实验对象,通过改变填料层数,得到脱碳率随填料层数变化的曲线。实验发现填料厚度大于端效应区时,脱碳率逐渐趋于常数。

Based on the assumption that a liquid jet has momentum conservation when flowing through the end effect area of a rotating packed bed, the Navier -Stokes equation was established and simplified in order to calculate the length of the end effect area for different liquid jet velocities and rotor speeds. The calculations showed that the length of the end effect area was directly proportional to the liquid jet velocity and inversely proportional to the rotor speed. Ink marks experiments were carried out for different packing thicknesses in order to observe the capture of the liquid. Comparison of the experimental length of the end effect area with the calculation results showed a maxi- mum deviation of 10%. A gas mixture of CO2 （ 10% ） ＋ N2 （90%） and an aqueous solution of NaOH were em- ployed in the experiments. Plots of rate of decarburization as a function of packing layer number were obtained. The experimental results showed that the rate of decarburization gradually reached a constant value once the thickness of the packing was larger than the length of the end effect area.