Page 291 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

Mechanical Separations 263

If inlet vane is formed with inlet connection: - ___
Areas: Gas Velocity Velocity Head"
Inlet duct: 1.398 sq ft 47.7 ft/sec 0.50 in. water
K = 7.5
Cyclone inlet: 2.0 sq ft 33.33 ft/sec 0.25 in. water
Cyclone exit duct: 3.14 sq ft 21.2 B/sec 0.10 in. water
Example 4-6: Cyclone System Pressure Drop ~. .. .~ -
*Velocity head, inches water = Voz/ (16) ( lo6), Ti, = ft/min

A cyclone system is to be installed as a part of a bagging Friction Loss @ to @ :
operation. The unit is shown in Figure 448. Determine
the head required €or purchase of the fan. The conditions N,, 2 398,000 f = 0.Q038
are:
Air volume: 4000 cu ft per min of air at 70°F 4fL
No. Vel. Hd. = - (.0038) ('*I = 0.204vel. head
=
Air density: 0.075 lb/cu ft D (16/12)

100

90
ao

70
60
50

40
30
20

10
0
63 5 10 15 20 25 30 35 40 45 50
ure 4-46. General efficiency cwves, applies specifically to helical entry cyclone dust separators. Courtesy of The Ducon Co.

TERMINAL VELOCITY - INCHES PER MINUTE
Figure 4-47. General efficiency cuwe applies specifically to involute entry cyclone dust separators. Courtesy of American
ican Radiator and Standard Sanitary Corp.