Abstract:

In order to explore the split effect of the innovative vapor splitter in the dividing wall column (DWC) and the influence of the change of the liquid split ratio on the vapor split ratio, a set of cold model experimental system for the DWC with a diameter of 600mm and a height of 5600mm was built. The results showed that in the experimental system, when the liquid split ratio was changed between 1 and 6, the vapor split ratio in the DWC was negatively correlated with the liquid split ratio. That is, the gas flow rate on the side where the liquid spray density increased will decreased, and the vapor split ratio can be reduced from 0.95 to about 0.6, which made the DWC away from the high-efficiency operation zone and seriously affected the mass transfer efficiency in the DWC. When the spray density was 6.27m³/(h·m²), 9.41m³/(h·m²) and 15.68m³/(h·m²), respectively, the vapor splitter exhibited better split effect in the DWC. The gas flow rate on the side where the spray density increased can be increased by adjusting the liquid level height on the vapor splitter, and the vapor split ratio can be adjusted from 0.85 to 1.25, which enhanced the gas-liquid two-phase mass transfer and ensured the efficient operation of the DWC.

Key words: DWC, vapor split ratio, mass transfer efficiency, distribution effect

摘要：

针对一种新型隔板塔气相分配器，搭建了一套直径600mm、高度5600mm的隔板填料塔冷模实验系统，探究了液相分配比变化对气相分配比产生的影响以及新型气相分配器在隔板填料塔内的分配效果。结果显示：在本实验系统中，液相分配比在1～6之间变化时，隔板塔内气相分配比与液相分配比呈负相关的关系，即液流喷淋密度增大的一侧气体量反而会减少，气相分配比最多可由0.95降至0.6左右，这使得隔板塔远离高效操作区，严重影响了隔板塔内的传质效率；喷淋密度分别为6.27m³/(h·m²)、9.41m³/(h·m²)、15.68m³/(h·m²)时，分配器在隔板填料塔中具有较好的分配性能，可以通过分配器上的调节液位高度，使得喷淋密度增大的一侧，气相流量增多，气相分配比可由0.85调节至1.25左右，加强了气液两相传质，保证了隔板塔的高效运行。

关键词: 隔板塔, 气相分配比, 传质效率, 分配效果