Staged Column Design
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Transcript Staged Column Design
FLOW PATTERN
a good length of
liquid path
a very long liquid
path
high liquid–vapor
ratios
FLOW PATTERN
• Cross flow
• Double pass
SINGLE PASS
DOUBLE PASS
DOWN COMERS AND WEIRS
WEIR
• Straight Horizontal
• Adjustable
• Notched
DOUBLE PASS SLOPPED
DOWNCOMERS
MECHANICAL SUPPORTS
MANWAY
TRAY HYDRAULICS
CAPACITY GRAPH FOR A TYPICAL
BUBBLE-CAP TRAY
FLOW REGIMES
CLOSE-UPS
• Cellular foam
• Froth (Operating
regime)
CLOSE-UPS
• Emulsion regime
• Froth regime
TRAY EFFICIENCY
Eo
N eq
Overall efficiencyN
ac
Efficiency correlation (O’Connell, 1946)
Eo 0.52782 0.27511log10 0.044923log10
2
MURPHREE EFFICIENCY MODEL
EMV
yout yin
*
yout yin
EML
xout xin
*
xout xin
It is possible to have
*
yout
yout
Thus,
EMV 1
xout x4 x3 x2 x1
SIEVE TRAY LAYOUT
• Net area
• Hole area
• Active area
LIQUID PRESSURE HEADS ON
SIEVE TRAY
hdc hp hweir hcrest hgrad hdu
PRESSURE HEADS ON BUBBLE CAP
TRAY
COLUMN DIAMETER
uop ( fraction)u flood
u flood K
V MWv
uop
v Anet 3600
Anet
( Dia) 2
4
L v
v
K Csb
20
0.2
Dia
Estimate
W
Csb from Csb VS Flv L
Wv
4V MWv
v ( fraction)u flood 3600
v
L
Capacity factor versus flow parameter
ADIOS!
• All of the references are provided during
class lectures.
• All of the pictures are taken from various
books and Websites solely for educational
purpose.
• The author is thankful to Dr, Syeda
Sultana Razia, associate professor, ChE,
BUET, for developing the core concept of
this presentation.