Page 309 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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Table 31. Main parameters of the studied packings with boundary layer totalizers
No. Packing Point h * d. a e Viscosity Density
5
type notation mm mm mm nAm m /m ».xl0*, Pi.
Pas kg/m 3
1 PO-235 o 235 0 20 187 0.936 1 998
2 PO-117 117 0 20 187 0.936 1 998
e
3 PO-58 ® 58 0 20 187 0,936 1 998
4 P15-235 + 235 15 20.7 182 0.94 1 998
5 P15-H7 X 117 15 20.7 182 0.94 1 998
6 P15-58 58 15 20.7 182 0.94 1 998
7 P7.5-235 235 7.5 20 188 0.94 1 998
8 P7.5-117 • 117 7.5 20 188 0.94 1 998
9 P3.75- 9 235 3.75 18.8 200 0.94 1 998
235
10 P3.75- n 117 3.75 18.8 200 0.94 1 998
117
•
11 P3.75-58 58 3.75 18.8 200 0.94 1 998
12 PO-58 B 58 0 20 187 0.936 3J 1110
o
13 PO-58 58 0 20 187 0.936 I B 1160
14 P3.75-58 • 58 3.75 181 200 0.94 5.6 1130
15 P3.75 Q 58 3.75 18.8 200 0,94 8.3 1150

For estimation of the influence of the boundary layer turbulizers on the
pressure drop, the data for the packing P0- 235 are presented in Fig. 67. The
difference between the two packings is only the presence of turbulizers on the
walls of the first of them.
The comparison shows that the pressure drop of a dry packing with
turbulizers is about two times higher. The irrigation at low liquid superficial
velocity leads to significant reduction of this ratio. At very high liquid
superficial velocity, this ratio is again about two.
The obtained data [153] show also that the reduction of the distance
between the turbulizers leads to increasing of the pressure drop.