Geoscience Reference
In-Depth Information
where
G
= Gas mass velocity, (lb/ft
2
-s).
F
= Packing factor = 160 for 1-inch Raschig rings.
Ψ = Ratio, density of water/density of liquid.
µ
L
= Viscosity of liquid (cp).
p
L
= Liquid density.
p
= Gas densit y.
g
c
= 32.2 lb-ft/lb-s
2
.
From USEPA's generalized flooding and pressure drop correction graph,
Ψ
()
=
02
.
2
GF
ppg
L
Lc
019
.
Solve the abscissa for the flooding gas mass velocity (
G
f
) in lb/ft
2
-s. The
G
value becomes
G
f
for
this case. Thus,
05
.
05
.
(
)
(0.19)
Ψµ
02
ppg
(. )( 224 0 075
0196
.)(.
)(
32 2
.)
Lc
2
G
=
=
= 0 400
.
lb/ft -s
f
()
.
02
.
(
160 118
)()(.)
F
L
Calculate the actual gas mass velocity (
G
act
) in lb/ft
2
-s:
G
act
= 0.6
G
f
= 0.6 × 0.400 = 0.240 lb/ft
2
-s = 864 lb/ft
2
hr
Calculate the diameter of the column in feet:
S
= (mass flowrate of gas stream)/
G
act
= 5000/
G
act
S
= π
D
2
/4
π
D
2
/4 = 5000/
G
act
D
= [(4(5000))/(π
G
act
)]
0.5
= 2.71 ft
REFERENCES AND RECOMMENDED READING
Calvert, S.J., Goldschmid, D., Leith, D., and Metha, D. (1972).
Wet Scrubber System Study
. Vol 1.
Scrubber
Handbook
,
EPA R2-72-118a. U.S. Environmental Protection Agency, Washington, DC.
Cooper, D. and Alley, F. (1994).
Air Pollution Control: A Design Approach
, 2nd ed. Waveland Press, Prospect
Heights, IL.
Corbitt, R.A. (1990).
Standard Handbook of Environmental Engineering
. McGraw-Hill, New York.
Heumann, W.L. and Subramania, V. (1997). Particle scrubbing, in Heumann, W.L., Ed.,
Industrial Air Pollution
Control Systems
. McGraw-Hill, New York.
Lapple, C.E. and Kamack, H.J. (1955). Performance of wet dust scrubbers.
Chemical Engineering Progress
,
51, 110-121.
Nukiyama, S. and Tanasawa, Y. (1983). An experiment on atomization of liquid by means of air stream (in
Japanese).
Transactions of the Japan Society of Mechanical Engineers
, 4, 86.
Perry, R. and Green, D., Eds. (1984).
Perry's Chemical Engineers' Handbook
, 6th ed.. McGraw-Hill, New
York.
Semrau, K.T. (1960). Correlation of dust scrubber efficiency.
Journal of the Air Pollution Control Association
,
10, 200-207.
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