填料种类和功能 新型填料的发展

Summary of Packing Kinds And Function,Including The

Development of New Kinds of Packings

In many cases, packing tower performs better than plate tower because the packings can be easily replaced and packing tower save more energy. Therefore, people have attached increasingly attention to packing tower recent years.

Packing is the core of packing tower and its characteristics determine the performance of the tower.

There are many kinds of packing used in the industry, which can be classified as solid packing and net packing. Solid packing includes ring packing, saddles, grid packing and Corrugated packing, etc. The net packing is made of metal mesh mainly.

One. Solid Packing

(1)Raschig rings

Raschig rings is a kind packing earliest used. Its diameter is

equal to the height, and it’s usually made of metal, plastic and

ceramics. The structure of the Raschig rings is simple and easy to

produce, but the packing which is formed from Raschig rings is

uneven, which makes the fluid flows toward the wall of the tower.

Therefore, Raschig rings is out of date.

(2)Pall rings

Pall rings is improved from Raschig rings. As shown in the

picture, one or two rows of rectangular holes are opened on the wall

of Raschig rings and keep the rectangular pieces attaching to the

wall which was bend toward the center of the ring. The structure of

Pall rings increase the usage of inner space surface of the ring, and

decrease the resistance.

(3)Berl saddle

This kind of packing looks like saddle, which has no inner

surface. Compared with Raschig rings, the utilization of the surface

is high and the resistance of gas flow is small. But because the Berl

saddle can overlap on each other, the exposed surface is small. In

addition, Berl saddle is easy to have channeling phenomenon.

(4)Intalox saddle

Compared with Berl saddle, intalox saddle can’t overlap on

each other, and it’s more easily to produce.

(5)Cascade rings

Cascade rings is reformed from Pall rings. As shown in the

picture, cascade rings looks like Pall rings. Its height usually is half

of the diameter. The packing that the cascade rings form is uniform

and porosity is big.

Two. Net Packing

There are many kinds of net packing, such as mesh rings, saddle

rings, etc. The characteristics of the net packing is the mesh is very

thin, while the specific surface area and the porosity is big. Net packing is suitable for precise distillation and vacuum distillation.

Three. Some Kinds of Usually Used Packings

Four. New Kinds Of Packing

(1)IMPAC packing

IMPAC packing can be seen as a kind of packing that many intalox packings joint together, with flat, saddle and ring structure. There are approximately 50 thousand water drops per square meter. Compared with present packings, the efficiency of IMPAC packing increases by 40% , and the packing can be used 10 years long.

(2)Super flat ring packing

QH-1 flat ring packing is created by Qsinghua University. When used in the liquid-liquid extraction, QH-1 flat ring packing perform better than Pall, Intalox and so on.

In order to improve the flat ring packing, QH-2 flat ring packing was created, whose Processing capacity increase by 15% to 25% roughly.

(3)Cascade mini ring(CMR)