Method and apparatus for downcomer tray operation

摘要

A downcomer tray assembly for vapor liquid contact towers. The region of the tray beneath an upper downcomer is constructed with a raised, perforated region for facilitating vapor passage therethrough and improving mass transfer efficiency. The downcomer includes a series of grouped discharge orifices disposed above either the perforated inlet or, in some cages, covered inlet areas which comprise momentum barriers. The covered areas in conjunction with the grouped orifices break the momentum of the liquid impacting upon the inlet area to reduce weeping. The vapor rising through the open inlet area sections is also selectively directed into the liquid discharged from the grouped downcomer orifices to promote uniform aeration of the liquid. A splash deflector is disposed outwardly of the raised inlet area to reduce any liquid maldistribution flowing from the inlet area and to deflect liquid splashed outwardly therefrom.