Page 169 - Air Pollution Control Engineering

03_chap_wang.qxd 05/05/2004 12:49 pm Page 148
148 José Renato Coury et al.

D Diameter of cyclone entry duct (m)
in
D Stokes diameter µm
St
D Vortex finder external diameter (m)
t
D Diameter of the particle collected with 16% efficiency (µm)
16
D Diameter of the particle collected with 50% efficiency [m, or µm in
50
Eqs. (69) and (73)]
D Diameter of the particle collected with 84% efficiency (µm)
84
e Parameter in Eq. (74)
E Fan efficiency
f
f(θ) Parameter in Eq. (67)
F Cunningham slip factor
s
F(x) Cumulative probability function of the standardized normal variable x
F , F , F Parameters in Eq. (71), given in Table 14
0 1 2
2
g Gravity, (m/s )
G Geometric parameter in the Leith and Licht model
h Height of the cyclone cylindrical body (m)
hp Motor horsepower
h m Height of the central axis in the Barth model (m)
H Cyclone total height (m)
H Height of the dust receiver cup (m)
cup
HRPM High-risk respirable fraction
H Stack height (ft)
stack
IPM Inhalable fraction
index CE equipment cost index in the month–year of a
a
index CE equipment cost index in the month–year of b
b
K Empirical parameter, listed in Table 11
K Dimensionless parameter in Eq. (17)
a
K Dimensionless parameter in Eq. (18)
b
K Dimensionless parameter in Eq. (19)
c
m Mass flow rate of particles with diameter D in the exit (kg/s)
oi i
n Vortex exponent
n Empirical parameters listed in Table 11
N Number of cyclones in parallel
c
P Penetration
P Cost of cyclone (US$)
cyc
P Cost of damper (US$)
damp
P Cost of two-way diverter valve (US$)
divert
P Cost of fan system (US$)
fan
P Cost of FRP ductwork (US$/ft)
FRPd
P Cost of fan motor, belt and starter (US$)
motor
PM Particle matter smaller than 2.5 µm
2.5
PM Particle matter smaller than 10 µm
10
P Cost of PVC ductwork (US$/ft)
PVCd
P Cost of rotary air lock (US$)
ral
P Total capital cost of large stack (US$)
stack