Tray DesignsĪ tray essentially acts as a mini-column, each accomplishing a fraction of the separation task. The area allowed for the passage of vapour on each tray is called the active tray area. such that the bubble caps are covered by liquid.īeing lighter, vapour flows up the column and is forced to pass through the liquid, via the openings on each tray. Liquid falls through the downcomers by gravity from one tray to the one below it.Ī weir on the tray ensures that there is always some liquid ( holdup) on the tray and is designed such that the the holdup is at a suitable height, e.g. The image below show the direction of vapour and liquid flow across a tray, and across a column.Įach tray has 2 conduits, one on each side, called downcomer. They are much more efficient than sieve trays. This FLEXITRAY TM valve tray is a steel sheet on which liftable valves are mounted.
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