Gas Emission Control - Mathematics and Statistics for the Environment - page 464

TABLE 16.2
Empirical Parameters for Equation 16.13

Tray Metric Ψ Engineering Ψ

Bubble cap 0.0162 0.1386

Sieve 0.0140 0.1196

Valve 0.0125 0.1069

Note: Metric Ψ is expressed in m 0.25 hr 0.5 kg 0.25 for use
with Q expressed in m 3 /hr and ρ g expressed in
kg/m 3 . Engineering Ψ is expressed in ft 0.25
min 0.5 lb 0.25 for use with Q expressed in cfm and
ρ g expressed in lb/ft 3 .
Source: Adapted from USEPA, Wet Scrubber System
Study , NTIS Report PB-213016, U.S.
Environmental Protection Agency, Research
Triangle Park, NC, 1972.

■ EXAMPLE 16.5. PLATE TOWER DIAMETER
Problem : For the conditions described in Example 16.2, determine the minimum acceptable diam-
eter if the scrubber is a bubble cap tray tower absorber. The trays are spaced 0.53 m (21 in.) apart
(USEPA, 1981, p. 4-34).

Tray Spacing, Inches

15 18 21 24 27 30

1.5

1.4

1.3

1.2

1.1

1.05

1.0

0.9

0.4 0.53 0.6 0.8

Tray Spacing, Meters

FIGURE 16.10 Tray spacing correction factor. (Adapted from USEPA, APTI Course 415: Control of
Gaseous Emissions , EPA 450/2-81-005, U.S. Environmental Protection Agency Air Pollution Training
Institute, Washington, DC, 1981, p. 4-33.)