fractionation column calculation
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SIZING COLUMN DISTILATION (based on GPSA - Detailed Method)
INPUT DATA5.06 lb/ft3
Vapor Mass rate 10460.00 lb/hr
Vapor Vol. rate 2065.97 ft3/hr
47.31 gpmLiquid density 24.14 lb/ft3
Liquid surface tension, 1.399 dyne/cm
12 inch
CALCULATION
A Calculate System Factor based on Fig. 19.15
system factor 0.72
Vapor Density
Liquid rate
tray spacing,
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B Calculate the downcomer velocity (VDdsg) based on Fig. 19-16
Tray spacing 12 inch
rL - rV 19.077 lb/ft3
VD*dsg 115 gpm/ft2
VDdsg= VD*dsg x system factor82.81 gpm/ft2
C Calculate the vapor capacity factor (CAF) based on Fig. 19.17
rV 5.063 lb/ft3
tray spacing 12 inch
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CAFo 0.27 ft/s
CAF= CAFo x system factor
0.19 ft/s
C Calculate the tray active area (AAM)
Vload 0.30 ft3/s NP 1
Dt 2
GPM 47.308387 gpm FPL 18
CAF 0.19 ft/s
FF 0.82 Flooding Factor (commonly used is 0.82 for most syste
AAM 2.27 ft2
D Calculate the tray downcomer area (ADM)
ADM 0.70 ft2 ok
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Check: if ADM is less than 11% of AAM, use 11% of AAM or double ADM, whicever is small
11% AAM 0.25 ft2
E Calculate the diameter of column (Dt)
ATM (1) 3.66 ft2 ATM (2) 2.38 ft2
Dt (1) 2.16 ft Dt (2) 1.74 ft
Dt selected 2.16 ft
F Height of Column Required (H)
21 HYSYS
Tray Efficiency 80% Assumption
Actual Tray 26
25
Tray Spacing 1.00 ft
Top Section 5 ft Commonly 5-10 ft is sufficie
Bottom Section 4 ft
34.25 ft
RESULT PARAMETER result
ID 2.16 ft= 660 mm H/ID 16
H 34.25 ft= 10450 mm H 34
G Nozzle Sizing
LocationMass Rate,
lb/hrDensity,lb/ft3
Vol. Rate,
ft3/h ID Pipe, inch
Actual
Velocity, ft/s
Actual rho-
v2
Feed Inlet 3715.07 9.217708572 403 2 1.75 28
Liquid Outlet 11940.326 24.39749223 489 2 2.12 110
Vapor Outlet 4803.2009 3.199174364 1501 2 6.50 135
Reflux Inlet 2886.5702 28.60986633 101 2 0.44 5Reboiler Inlet 10141.886 5.145151558 1971 2 8.54 375
H Bottom Level Setting
Interval Level, inch
Total Volume,
ft3
Hold-up
Time, minin. Level, inc
Min. Hold-up
Time, minCriteria
LLLL-BOV 12 43.91 7 12 OK
LLL-LLLL 6 21.95 3 6 1 OK
Theoritical Tray
space inter Tray
Heigh of Column
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NLL-LLL 6 21.95 3
HLL-NLL 6 21.95 3
HHLL-HLL 6 21.95 3 6 1 OK
Total 36
Min. height of bottom sectio 3 ft
12 3 OK
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Hysys
Hysys
HysysHysys
Hysys
Assumption
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pass tray assumption
ft Fig. 19.14
ft
m)
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r.
t for disengaging purpose
Criteria
max. 20
175
.
Velocity,Max. rho-
v2Criteria
4000 OK
3 OK
60 2500 OK
4000 OK4000 OK
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