Page 166 - Air Pollution Control Engineering

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Cyclones 145

Table 23
Particle Size Distribution, in Stokes Diameter
Range (µm) x (mass basis)
i
0.3–0.5 0.0095
0.5–0.7 0.0095
0.7–1.0 0.039
1.0–3.0 0.098
3.0–5.0 0.245
5.0–10.0 0.296
10.0–20.0 0.228
20.0–50.0 0.075

Table 24
Results from the Calculation of the Particle Size Distribution in the Cyclone Exit

Range (µm) D (µm) D (µm) η η x
St ae i i i
0.3–0.5 0.4 0.66 0.00023 0.000002
0.5–0.7 0.6 0.99 0.00127 0.000012
0.7–1.0 0.85 1.41 0.01060 0.000413
1.0–3.0 1.5 2.49 0.66270 0.064945
3.0–5.0 4.0 6.63 0.99999 0.244998
5.0–10.0 7.5 12.43 1.00000 0.296000
10.0–20.0 15.0 24.87 1.00000 0.228000
20.0–50.0 35.0 58.03 1.00000 0.075000
Ση x = 0.91
i i

Table 25
Determination of the Particle Size Distribution in Example 9
3
D (µm) Q (L/min) c (µg/m ) % in range accum. %
50 in
1.0 2.73 0.195 0.1 0.1
1.5 1.68 1.562 0.8 0.9
2.0 1.19 7.027 3.6 4.5
2.3 1.01 21.667 11.1 15.6
2.8 0.80 38.064 19.5 35.1
3.2 0.68 33.574 17.2 52.3
3.6 0.59 38.259 19.6 71.9
4.0 0.52 26.352 13.5 85.4
5.0 0.40 18.739 9.6 95
7.0 0.27 9.565 4.9 99.9
10.0 0.17 0.195 0.1 100
Σ c = 195.2
in