A stack emitting 55 g/s of SO2 has an effective stack height of 150 m. The windspeed is 4 m/s at 10 m above ground and 5 m/s at the effective smokestack height. It is a cloudy summer day. Estimate the ground-level SO2 concentration directly downwind at a distance of 2 kilometers.Note: Strong insolation refers to a clear summer day, moderate refers to a summer day with few broken clouds, slight refers to a fall afternoon or a cloudy summer day. Atmospheric Stability ClassificationSurfacewind speed Strong(m/s)<22-33-55-6Daytime insolation> 6AA-BBCCModerateA-BBB-CC-DDDispersion Coefficient ParametersSlightBCCDDNight-time conditionsThinovercast or> 4/8 lowcloudEEDDD<= 4/8cloudinessFFEDD Dispersion Coefficient ParametersABСDEFla2131561046850.534x <= 1 kmC440.8 1.041106.661.033.2d22.81.149 3.39.270.911 0.00.72514.35 0.740-1.70.675 -1.3x > 1 km459.7108.261.044.555.4-0.35 62.6d2.094 -9.6f1.098 2.00.911 0.00.5160.180-13.00.305 -34.0-48.6

Emission of SO2 =55g/s Stack height = 150 m wind speed at 10 m = 4 m/sec wind speed at effective…

Answered: A stack emitting 55 g/s of SO2 has an…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A stack emitting 55 g/s of SO₂ has an effective stack height of 150 m. The windspeed is 4 m/s at 10 m above ground and 5 m/s at the effective smokestack height. It is a cloudy summer day. Estimate the ground-level SO₂ concentration directly downwind at a distance of 2 kilometers.

Note: Strong insolation refers to a clear summer day, moderate refers to a summer day with few broken clouds, slight refers to a fall afternoon or a cloudy summer day.

Atmospheric Stability Classification
Surface
wind speed Strong
(m/s)
<2
2-3
3-5
5-6
Daytime insolation
> 6
A
A-B
B
C
C
Moderate
A-B
B
B-C
C-D
D
Dispersion Coefficient Parameters
Slight
B
C
C
D
D
Night-time conditions
Thin
overcast or
> 4/8 low
cloud
E
E
D
D
D
<= 4/8
cloudiness
F
F
E
D
D

Dispersion Coefficient Parameters
A
B
С
D
E
F
la
213
156
104
68
50.5
34
x <= 1 km
C
440.8 1.041
106.6
61.0
33.2
d
22.8
1.149 3.3
9.27
0.911 0.0
0.725
14.35 0.740
-1.7
0.675 -1.3
x > 1 km
459.7
108.2
61.0
44.5
55.4
-0.35 62.6
d
2.094 -9.6
f
1.098 2.0
0.911 0.0
0.516
0.180
-13.0
0.305 -34.0
-48.6

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