Contact tray for a mass transfer column

摘要

The valve cover has a guide vane extending laterally and downwardly from the central portion towards and in spaced relation to the tray deck for deflecting a majority of the vapor passing upwardly through an orifice downward towards the tray deck. A de-entrainment device with a downwardly angled deflector in vertical alignment with an orifice in the tray deck may be integrated or not with the valve cover below the tray deck.

主权项

1. A valve cover for a mass transfer column comprising
a central portion for disposition in spaced relation to an orifice for passage of an ascending flow of vapor in a tray deck; a pair of legs extending downwardly from opposite ends of said central portion; at least one guide vane extending laterally and downwardly from said central portion for deflecting at least a part of the vapor ascending through a respective orifice towards said tray deck; and a pair of depending extensions, each said extension including a first portion for passing through said orifice of said deck, a second portion extending downwardly from said first portion and towards a second portion of the other of said pair of extensions and a U-shaped portion extending upwardly from said second portion and defining a pair of prongs spaced from said tray deck a predetermined distance for abutting an underside of said tray deck in response to lifting of said valve cover relative to said tray deck.