Name the types of trays used for distillation operation?(Sieve Trays,Bubble cap Trays,Valve trays uses advantages and disadvantages)

Name the types of trays used for distillation operation?



The terms "trays" and "plates" are used interchangeably. There are many types of tray designs, but the most common ones are:

Sieve Trays

Sieve trays are simply metal plates with holes in them. Vapour passes straight upward through the liquid on the plate. The arrangement, number and size of the holes are design parameters.

Because of their efficiency, wide operating range, ease of maintenance and cost factors, sieve and valve trays have replaced the once highly thought of bubble cap trays in many applications.

Typical Schamtics of Sieve Trays:

Bubble cap Trays

A bubble cap tray has riser or chimney fitted over each hole, and a cap that covers the riser. The cap is mounted so that there is a space between riser and cap to allow the passage of vapour. Vapour rises through the chimney and is directed downward by the cap, finally discharging through slots in the cap, and finally bubbling through the liquid on the tray.


Typical Schamtics of Bubble Cap Trays:

Valve trays

In valve trays, perforations are covered by liftable caps. Vapour flows lifts the caps, thus self creating a flow area for the passage of vapour. The lifting cap directs the vapour to flow horizontally into the liquid, thus providing better mixing than is possible in sieve trays.

Typical Schamtics of Valve Trays:
 
 

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