How many trays are there in the distillation column?
five
There are five major types of tray column; bubble cap tray, sieve deck tray, dual flow tray, valve tray and baffle tray.
What is use of chimney tray in distillation column?
A chimney tray is used to allow vapor to flow upward without contacting the liquid on that tray. for instance, the vapor return from a side-stream reboiler is best returned above the draw tray, with location where it best matches the other vapor flowing up.
What is Downcomer backup?
Downcomer backup is a function of the tray pressure drop, the head at the inlet side of the tray, and the frictional losses in the downcomer itself.
What is Downcomer in distillation column?
Downcomer: A device to direct the liquid from a distillation column at a location above the bottom tray and below the top tray.
What is baffle tray?
Baffle trays are unperforated trays with large “downcomer” areas for use in low-efficiency and highly fouling services which require a lower degree of vapor/liquid contact when compred to other conventional trays.
What is sieve tray?
Sieve trays are simple perforated plates with small holes about 5 to 6 mm (0.2 to 0.25 inch) in diameter. Valve trays are similar, except the perforations are covered by small metal disks that restrict the flow through the perforations under certain process conditions.
What is Valve tray?
A valve tray is a flat perforated plate, with each perforation fitted with a movable disk (the “valve”). See the Figure below. The perforations and disks may be circular or rectangular. The disks (valves) are the movable component of the tray – see the Figure below.
What is foaming in distillation column?
Foaming in a distillation column is the expansion of liquid that provides high interfacial liquid-vapor contact. Although one of the least common causes of distillation column malfunctions, foaming can increase until the fluid in one tray mixes with the liquid on the above tray in a process called entrainment.
What is weir in tray?
Weirs. The function of a weir is to maintain a desired liquid level on the tray. Typical weir height is between 2 – 4 inches. Low weirs are frequently used in low pressure or vacuum columns. Notched (rectangular or V-shaped) weirs are commonly used for low liquid loads.