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Separator Design 311

Table 6.19 Calculation Procedure for Sizing Rotary-Drum Filters_____

1. Calculate the mass fraction of liquid in the entering stream, y u, from Equations 6.18.3

from Equation 6.18.7.
2. Calculate the density of the entering stream, p b
3. Calculate the mass fraction of solids in the cake, y^, from Equation 6.18.4.

4. Calculate the concentration of solids in the entering stream, C 1>2, from Equation 6.18.8.
5. Calculate the rate of wet cake formation, me, from Equation 6.18.2.

6. Calculate the volumetric flow rate of liquid in the exit stream, V 2, from Equation 6.18.1.

7. Calculate the specific cake resistance, a, from Equations 6.18.9.
8. Calculate the filter area, A F, from Equation 6.18.5.

9. Calculate the drum area, A T, from Equation 6.18.6.

10. Select a standard rotary-drum filter from Table 6.20.
Table 6.20 Standard Rotary-Drum Filters_________________

37 /2 % Drum Submergence

Filter Size Nominal Drum Drum Agitator
Diameter" Length 3 Area b Drive" Drive 0
ft ft ft 2 hp hp
8 6 150 1 1 /2
10 61/3 200 1 '/2 3
10 8 250 1/2 3
10 10 300 l!/2 3
11.5 10 360 1/2 3
11.5 12 430 1/2 3
11.5 14 500 2 5
11.5 16 575 2 5
12 20 750 5 5

a) To convert to meters multiply by 0.3048.
b) To convert to square meters multiply by 10.76.
c) To convert to kilowatts multiply by 0.7457.

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