Study On Performance Of Bubble-cap Tridimensional Sieve Trays

In the chemical, petrochemical, oil refining and other production, plate column as a very important gas-liquid mass transfer has a pivotal role. Therefore, the study of the plate column is of great significance in column technology. The study has independent development four different structure of BTS (bubble-cap tridimensional sieve tray) on the basis of statement about the design feature of new style tray and research status at home and abroad in this paper, and their various properties were measured.The experiment was divided into two stages. The first stage, in a 1000 mm×400 mm plexiglass column, the four kinds of trays distributed on its two experiment boards, the cold model experiment was carried out in air-water system, and the dry plate pressure drop, wet-plate pressure drop, entrainment, weeping and other hydrodynamic properties were measured at different gas-liquid load, and then one tray being of good performance was elected from each board. The second stage, four structural parameters were adjusted of the selected tray, such as the tray opening ratio, the exit weir height, the bubble-cap height and the base gap opening ratio. The two mass transfer process of VST(vertical sieve tray) and bubble-cap tray was realized, meanwhile, the hydrodynamic performance was examined, its operating flexibility broaden, and finally the optimized BTS structure was gained. Hydrodynamic performance of two kinds of trays were compared under the same liquid flow strength, tray efficiency was determined through the method of oxygen-adsorption in oxygen-water-air system, and it was compared with VST.Experimental results showed that BTS was of novel structure, four different structure of trays have similar hydrodynamics. BTS-1 was proven to be a better tray in terms of overall performance compared with BTS-2,3,4, but its pressure drop also need to be further reduced. It has an important instruction function to the actual industrial applications. The membrane atomization bubbling mass was fully realized within relatively wide range of gas loading by the BTS-1, its operating flexibility greater than 3, which could meet requirements of general industrial design load range 60-120%, the maximum operating flexibility surpass 3.5, the tray efficiency was improved by about 20% than VST. The plate pressure drop, entrainment, weeping were regressed according to the experimental data, it has provided the theory support for its industrial application. This article proposed BTS and VST technology coupled and integrated thought for the first time. BTS-1 initially to meet the requirements of industrial design, the author is expected to be higher separation efficiency and processing capabilities in industrial applications.