How to Estimating Diameter Size of Distilation Tower
Oil and gas refinery facility  There are so many question came from IndustriMigas follower about how to estimating diameter size of distilation tower at refinery production facilities. Estimating
diameter size of distillation tower in oil and gas refinery facility is the
most important step to design a distillation tower. Detail steps of estimating
diameters size of distillation coloumn are :
Calculate Liquid – Vapor Flow Parameter
To
calculate liquid – vapour flow parameter (F_{LV}) using this formula:
Where :
WL = mass rate liquid per unit area, lb/ hr
Wv = mass rate vapor per unit area, lb / hr
ρv = density vapor ,lb/ft^{3}
ρL = density liquid, lb/ft^{3}
Calculate Corrected CSB
Where :
σ =
actual interfacial tension (mN/m^{2})
Calculate Vapor Velocity (U_{N})
To
calculate vapor velocity using this formula:
Calculate Net Area
To
calculate net area of distillation tower using this formula :
Where :_{}
A_{N} = Net area for vapor flow
CFS =
volumetric rate of vapor, ft^{3}/sec
F_{F }= floading factor , umumnya diambil 80 %
atau 0.8
Calculate Total Tower Area (A_{T})
To calculate total tower area of
distillation tower using this formula :
Where :
A_{D}
= downcomer area, ft^{2}.
Calculate Diameter Tower (D_{T})
After calculate all of parameter above we
can calculate Diameter of Distilation Tower using this formula :
Maximum clear liquid velocities in down
comer*.
Foaming
Tendency

Example

Clear
Liquid Velocity, ft/sec


Spacing


18
in

24
in

30
in


Low

Low
press. (<100 psia).Light HC. Stabilizer.
airwater simulator

0.40.5

0.50.6

0.60.7

Medium

Oil
system. crude oil distillation. mid
press. (100300 psia) HC

0.30.4

0.40.5

0.60.7

High

Amine.
glycerine. glycols. high press. (>300 psia).
light HC

0.20.25

0.20.25

0.20.3

Note : * Source “Distillation Operation.
Henry Z. Kister”
How to Estimating Diameter Size of Distilation Tower
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