Page 355 - Chemical process engineering design and economics

334 Chapter 6

Table 6.27 Continued

Feed Plate Location
2
Nu / N L = [ (X HK/X LK) F (x LK,B/x HK,D) (B / D) f 206 (6.27.12)
N e = Nu + N L (6.27.13)
Column Height
Tray Columns

N A = N e /E 0 (6.27.14)
Z = N A x Tray Spacing + L s + 4.0 ft (6.27.15)
Tray Spacing — from Table 6.25

L s = 4 V B t s' / 7i (D') 2 — D is calculated using Tables 6.23 and 6.24 (6.27.16)

Packed Columns

Z = N e x (HETS) + L s + 4.0 ft (6.27.17)
Column Diameter

Follow the procedure outlined in Table 6.23
System Properties

OC^KJ/KHK (6.27.18)
(ai)avg = (oCi F a iD a iB ) 1/3 (6.27.19)

i
a F = I; Xj F' a; F — a F calculated at (T T + T B)/2 (6.27.20)
OC F) — Figure 6.17 (6.27.21)
E 0 = f(u F
Ki = yi/Xi (6.27.22)

K ; = f(T',P') (6.27.23)

I
u-F = i X i F ' H i F (6.27.24)
u iF = f[(T T + T B)/2] (6.27.25)

HETS = D' — for D < 0.5m (6.27.26)
3
or HETS = (D')° — for D > 0.5m

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