Mass Transfer Efficiency Study Of Combined Directed Floating Valve

In this paper, mass transfer efficiency of Combined Directed Floating Valve was studied in a stainless tower with diameter of 750mm, height of 4m and with 4 trays of 600mm plate spacing, mixture of cyclohexane and n-heptane system was used as testing media. The influences of F factor, outlet weir height, hole area percent and reflux temperature on mass transfer efficiency of cross-type valve trays were investigated in total reflux and atmospheric pressure. The results showed that the mass transfer performance of Combined Directed Floating Valve tray with 11.2% hole area was the best one among the 8.47%,11.2%,13.56% and 15.68% hole area at reflux temperature 80～85℃; the tray efficiency increased slightly with the increase of F-factor, and the efficiency increased obviously when the weir height became larger; the tray efficiency increased with the increasing of the temperature of reflux at Combined Directed Floating Valve tray, but the operation will become difficult; the tray efficiencies of Flfloating valve,sieve and combined directed floating valve were compared under the similar conditions, It is found that,with the close hole area percent, the tray efficiency of Combined Directed Floating Valve was the best. Moreover, the efficiency of the third tray was calculated by AIChE model, the difference between experiment and calculation was about 5%, the research results could provide the critical data for industrial application.