Page 203 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

193

In details the problem with the maximum efficient capacity factor C S€
(called also maximum entrainment parameter) is considered in Chapter 1, Fig.
11, and equation (249).

0.3
*15 IMTP-i »25 IMTP-r «<0 WTP-j »50 MTP-j «70 IMTP-T
0.2
ifc
• — 1 mm / / /
_ /
=
B
=
^_ — /
— ' III— i *» • J
— - — I
0.1 ^•^^
' 0.08 - ^ ^ * I
%^
0.06 ^^
*^»
V,
0,04
0.03
0.01 0.02 0.03 0.04 0.06 0.08 0.1 0.2 0.3 0.4 a6 0.8 10
FLOW PARAMETER, X
Fig. 15. Capacity correlation for IMTP packing.

As shown in Chapter 1, equation (249), the parameter Co is related to
Cse by the equation:

(53)
\0J6 /
)
{
20000) {200

Iliuta et al. [305] proposed a theoretical model based on the model of
Ergun for predicting the pressure drop of dry and irrigated random packings, the
wetted area, and also the liquid holdup. The model used two experimental
constants different for different packing types and dimensions. The prediction
accuracy of the pressure drop is ± 30%, but many of the data show up to 3
times greater error. The prediction accuracy of the liquid holdup and of the
wetted area is about 20%.
For calculation of the gas velocity at the loading point (w s), Billet and
Schultes [316] offered the following equation: