Abstract: To address persistent issues such as unclear application ranges and difficulties in structural optimization of composite tridimensional rotational flow sieve tray (CTRST)—primarily due to poorly understanding of gas-liquid cross-zone distribution mechanisms, experimental investigations were carried out to examine gas-liquid cross-zone distribution and flow loss mechanisms in both the packing and swirl zones of the CTRST. A key parameter, the net cross-zone flow proportion, was introduced for both gas and liquid phases to accurately quantify inter-zone flow conditions. The results revealed that, under the tested conditions, the net liquid cross-zone flow proportion varied between -0.325 and -0.370, with the net flow direction moving from the swirl zone to the packing zone. Conversely, the net gas flow ratio ranged from 0.022 to 0.310, showing a net flow from the packing zone to the swirl zone. By employing the net cross-zone flow loss ratio, the loss mechanisms during gas-liquid cross-zone transfer were further analyzed. It was observed that liquid spray density and gas kinetic energy factor had only a minor influence on the net inter-zone liquid phase loss flow rate percentage, suggesting that resistance to liquid phase exchange between zones was relatively low. In contrast, the gas phase loss flow rate ratio varied significantly from -0.047 to -0.319, indicating considerable resistance to gas phase interaction across zones. This ratio initially increased and then decreased with higher liquid spray density, reaching a peak at 92.26 m3/(m2?h). Additionally, it showed a gradual increase with higher gas kinetic energy factor. Based on these findings, a predictive model for the net cross-zone mass transfer rate was developed, which effectively correlated the influence of operational parameters with flow loss intensity. This model offers valuable theoretical support for further exploration of the gas-liquid cross-zone mass transfer distribution mechanism in CTRST systems, thereby aiding in the optimization of tray design and operational guidelines.

Key words: composite tridimensional rotational flow sieve tray, column, gas-liquid two-phase flow, net cross-zone flow proportions, loss flow, gas-liquid cross-zone flow model

摘要： 针对复合立体旋流筛板(CTRST)中由于气、液跨区分配机制不清晰造成塔板适用范围不明确、结构优化困难等问题，对CTRST填料区与旋流区的气液跨区分配和气液流量损失机制开展实验研究。引入气、液相净跨区流量占比，用于量化筛板跨区流动情况。结果表明，实验条件下，净跨区液相占比为-0.325~-0.370，净流动方向为旋流区至填料区，气相占比为0.022~0.310，净流动方向为填料区至旋流区。使用净跨区损失流量占比对气液两相跨区流动的损失机理进行分析。流动过程中，液相喷淋密度与气相动能因子对净跨区液相损失流量占比影响较小，液相在两区间的交互所受阻碍作用较小。气相损失流量占比为-0.047~-0.319，气相在两区间的交互所受阻碍作用较大，随液相喷淋密度增加，气相损失流量占比先增加后减少，液相喷淋密度为92.26 m3/(m2?h)时达到最大值；随气相动能因子增加，气相损失流量占比逐渐上升。最后，建立了净跨区流量占比预测模型，关联了操作条件变化对气液跨区流动的影响，为CTRST气、液跨区流动分配机制的研究提供了理论支撑。

关键词: 复合旋流筛板, 塔器, 气液两相流, 跨区流量占比, 损失流量, 气液跨区流量模型