气液两相并流下行通过堆叠筛板填料的压降特性

堆叠筛板填料已在核电站放射性气体除气塔中得到成功应用。针对这一新型填料的应用设计，在较广泛的气液流量下，对气液并流下行通过不同规格堆叠筛板填料的阻力特性进行了系统的实验。实验填料共6种规格，孔径参数包括6、10和14 mm，不同孔径填料对应不同的孔间距、板间距，每种孔径填料具有正方形和正三角形两种筛孔分布方式。通过压降数据分析，研究了流动参数和几何参数（孔径、开孔率、布孔方式、板间距）对气液两相并流通过填料的流动行为及压降特性的影响；结合多孔板阻力系数经验公式提出了堆叠筛板填料干板阻力系数的计算模型，模型很好地反映了不同几何参数对干板阻力系数的影响，预测偏差在5%范围以内；基于均相流模型提出了堆叠筛板填料气液两相压降的预测模型，模型预测偏差在10%范围以内。研究工作对堆叠筛板填料塔的应用设计及进一步的传质动力学研究有一定参考价值。

Pressure drop of gas-liquid two phases parallelly flowing down through a stacked sieve plate packing

Stacked sieve plate packing, a newly developed packing, has been successfully used in degassing column of nuclear power plant. For the purpose of engineering design, systematic experiments were carried out to investigate resistance characteristics of gas-liquid co-currents flowing down through this packing under a broad range of gas-liquid flowrate. 6 packings were used, including three hole diameters of 6 mm, 10 mm, 14 mm and their corresponding square and triangle hole distributions. Different hole diameters had different spacing between holes and plates. Measurement of pressure drop were analyzed to understand influence of flowrates and geometrical parameters, e.g., hole diameter, hole distribution, hole spacing and plate spacing, on flow behaviors and pressure drop characteristics of gas-liquid two phases parallel through the packings. Based on empirical formula of perforated plate resistance coefficient, a new correlation of resistance coefficient for single phase (gas) flowing through stacked sieve plate packing was developed. The model correctly reflected influence of all geometrical parameters in good agreement with experimental results with a deviation of less than 5%. Further, based on homogeneous flow model, a prediction model of two-phase pressure drop of gas and liquid flowing through stacked sieve plate packing was proposed. This new two phase pressure drop model had good prediction with less than 10% deviation. This work provides valuable basis not only for the design of stacked sieve plate packing column, but also for further study of mass transfer in this new packing.