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 :
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| Illustration Distillation Tower, doc. arb.ca.gov |
Calculate Liquid – Vapor Flow Parameter
To
calculate liquid – vapour flow parameter (FLV) 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/ft3
ρL = density liquid, lb/ft3
Calculate Corrected CSB
Where :
σ =
actual interfacial tension (mN/m2)
Calculate Vapor Velocity (UN)
To
calculate vapor velocity using this formula:
Calculate Net Area
To
calculate net area of distillation tower using this formula :
Where :
AN = Net area for vapor flow
CFS =
volumetric rate of vapor, ft3/sec
FF = floading factor , umumnya diambil 80 %
atau 0.8
Calculate Total Tower Area (AT)
To calculate total tower area of
distillation tower using this formula :
Where :
AD
= downcomer area, ft2.
Calculate Diameter Tower (DT)
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.
air-water simulator
|
0.4-0.5
|
0.5-0.6
|
0.6-0.7
|
Medium
|
Oil
system. crude oil distillation. mid
press. (100-300 psia) HC
|
0.3-0.4
|
0.4-0.5
|
0.6-0.7
|
High
|
Amine.
glycerine. glycols. high press. (>300 psia).
light HC
|
0.2-0.25
|
0.2-0.25
|
0.2-0.3
|
Note : * Source “Distillation Operation.
Henry Z. Kister”