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采用空气-水系统,在1 500 mm×400 mm的矩形塔内,对4种不同角度的梯形孔垂直筛板(TH-VST)和1种具有相同结构参数的矩形孔垂直筛板(RH-VST)的持液量分布进行了实验研究。结果表明:TH-VST清液层高度的不均匀分布程度(参差度)比RH-VST塔板有明显改善。参差度随着梯形顶角θ(两斜边延长线夹角)的增大先减小后增大,随着液体流量的增大而增大,随气速的增加先减小后增大。根据实验结果得到了具有良好导流性能的梯形顶角θ的范围,同时给出了参差度的关联式,为工程设计提供了初步的依据。
In the 1 500 mm × 400 mm rectangular tower, four kinds of trapezoidal hole vertical sieve plates (TH-VST) with different angles and one rectangular hole sieve plate with the same structural parameters (RH- VST) liquid holdup distribution of the experimental study. The results show that the degree of non-uniform distribution of the TH-VST clear layer height (degree of variability) is significantly improved over the RH-VST tray. With the increase of the trapezoidal vertex angle θ (the angle between the two hypotenuse extension lines), the degree of coherence first decreases and then increases, and increases with the increase of liquid flow rate, then decreases and then increases with the increase of gas velocity. According to the experimental results, the range of the trapezoidal vertex angle θ with good flow conductivity is obtained. At the same time, the relation of the degree of difference is given, which provides a preliminary basis for engineering design.