| Divided wall column（DWC）as the lowest energy consumption devices and the most efficient separation equipment for multicompnent mixtures separating,got attention of many researchers,as a cutting-edge research hotspot of the distillation energy-saving technology.DWC has complex structure and multi-degree of freedom,so the control of the column is of importance,which is the main reason for the slow acceptance of DWC in process industry.Vapour split as a very important tuning parameters,only relating the purity of products,but aslo directly determing the level of energy comsumption and thermal effciency.Based on the research the vapour split device was proposed and the paper researched the pressure drop and mass transfer performance in DWC.For two-phase gas-liquid flow characteristics under the action DWC conducted research on V-type cap angle changes,the distance between V-type cap and vapour tube changes,the deflection angle valves,spray density changes,pressure on the tower to study the impact of lower generation.The novel divided wall column on vapour splitter was used to realize the control of vapour split in the DWC and resolve the design challenge of vapour split structure.Adopting oxygen-air-water system,using acid-base titration,the effect of V-type cap angle,the distance between V-type cap and vapour tube and gas-liquid load on the mass transfer characteristics of divided wall column was studied through experiments.In the case of the change of operating conditions,when the Rv increased from 0.1to 1,it could effectively regulate the gas split on the both side and have significant influence on the mass transfer efficiency on the both packed bed。In this paper,the orthogonal experiment of the multi-factor effect on the mass transfer efficiency was designed,with gas load and liquid load、V-type cap angle and distance between V-type cap and vapour tube as the operational variables and height of mass transfer unit HOLL as the measured variable,at the same time taking the interaction of the operating conditions and structure conditions into consideration.The orthogonal experimental showed that the weight orders of factors influencing the mass-transfer efficiency:vapour flux>V-type cap angle>interaction of liquid and vapour flux>liquid flux>the distance between V-type cap and vapour tube>interaction of the distance between V-type cap and vapour tube and V-type cap angle. |
