Various Types Metal Tower Internals Stainless Steel Random Packings
There are many types of random packing.
The inner surface of raschig ring is not easy to be fully wetted by liquid, which affects its mass
transfer efficiency.
In 1940s, a rectangular window was opened on the ring surface of
the packing to increase the turbulence of the gas phase and the
wetting of the liquid phase, so as to enhance the mass transfer and
reduce the pressure drop.That is pall ring.
In 1970s, Hy-PAC ring, the single tongue of each window of pall ring was changed into
two tongues with opposite direction, so that the tongue was twice
as many as pall ring, which strengthened the concentration and
dispersion of liquid in the packing layer, increased the internal
agitation of the liquid drop, improved the gas-liquid distribution,
increased the mass transfer rate, increased the flux, reduced the
pressure drop and expanded the operating flexibility. The convex
ring groove is rolled on the ring wall to improve the strength. At
the same pressure drop, the processing capacity of Hy-PAC ring is
10% higher than that of pall ring.
In 1970s, cascade mini ring, the ratio of height to diameter is made into 1:3, the two ends
are flanged, which increases the rigidity, and makes the packing
mainly point contact when loading, which increases the gap between
the packing elements. Its height diameter ratio is small, its
center of gravity is low, and it tends to be placed flat in the
loading procedure, so the random bed layer has the effect of
structured bed layer, which reduces the resistance of gas passing
through the packing layer.
In 1980 s, VSP packing was introduced. It has reasonable geometric symmetry. The edges
and corners of the packing are obvious, similar to the lattice
structure. It is easy to form droplets in the packing layer, making
the effective mass transfer area larger than the simple geometric
surface. Compared with pall ring, the flux can be increased by 15%
- 30%, and the pressure drop can be reduced by 20% - 30%.
In 1970s, metal intalox saddle ring, which smartly integrates the ring and saddle shape into a whole,
has the characteristics of both the large flux of the ring packing
and the good gas-liquid distribution performance of the saddle
packing. It improves the flux and reduces pressure drop of random
packing, improves the mass transfer efficiency, and enlarges the
application range of random packing.
Specifications of metal intalox saddle rings:
| Dia. | Size mm | Thickness mm | Bulk Qty n/m3 | Specific area M2/m3 | Void % | F factor |
| 15# | 16.5*10.6 | 0.3 | 325000 | 265 | 96.5 | 291 |
| 25# | 25.9*12.6 | 0.3-0.4 | 128000 | 193 | 97.4 | 207-213 |
| 40# | 35.4*18.8 | 0.3-0.4 | 52000 | 143 | 97.9 | 156-159 |
| 50# | 48.5*28.6 | 0.4-0.6 | 15550 | 94 | 98.1 | 98-101 |
| 60# | 67*37 | 0.4-0.6 | 8400 | 76 | 98.8 | 79-80 |
| 70# | 76.5*42.5 | 0.5-0.6 | 4700 | 59 | 99.1 | 62 |
Random packing position in packed tower:
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