125Y 200mm Metal Structured Packing With Circle Plate

Characteristics of packed tower

Compared with plate column, packed column has certain advantages, especially in recent years, a variety of new and efficient packing has been developed, which has more prominent advantages and wider application range. Its specific characteristics are as follows:
1. The pressure drop is very low, which can be used in vacuum distillation and other operating systems with limited pressure drop.
2. With the development of new high efficiency packing, the production capacity (allowable gas velocity) and efficiency of packed tower are equal to or exceed those of plate column. Many units at home and abroad use new packing to transform plate column, which greatly improves production capacity and efficiency.
3. Flexible operation.
4. It can deal with foaming system.
5. General fillers are easy to be blocked by suspended solids in the liquid, while some grid fillers with large void fraction have self-cleaning effect under high gas velocity scouring, and are not easy to be blocked, and their heat transfer performance is better than that of baffles.
6. The material selection of fillers is wide, such as metal, plastic, ceramic, graphite, etc., which is suitable for wider chemical system and operating system.
7. Small liquid holding capacity, suitable for the treatment of heat sensitive materials.
8. The total investment cost of small tower (diameter ≤ 0.6m) is lower than that of plate tower, but the investment cost of large tower is higher.
9. The heat exchange in the middle of the tower is inconvenient.
10. It is difficult to draw out the side line and the structure is complex.
11. High requirements for initial gas-liquid distribution.
The process control is difficult because of its small liquid holding capacity and sensitivity.

Corrugated packing is widely used in structured packing. Its geometric parameters are generally characterized by the geometric structure and characteristic size of the corrugated sheet, which is the monomer of the packing layer.

① Peak height h
② Wave distance 2B
③ Tooth apex angle ξ
④ Inclination angle of corrugation
Generally, the B ≈ h and ξ of corrugated packing are 75 - 90, 78 - 81, φ = 45 (Y type), 30 (X type).
⑤ The hydraulic (or equivalent) diameter DH is used to characterize the size of the fluid channel of the regular packing unit, which can be derived according to the rules of fluid mechanics
DH=
⑥ Specific surface area. The sum of geometric surface area of filler in unit volume packing layer, unit m2 / m3.
Alpha =
⑦ Porosity ε is the volume of void in a unit volume of filler layer, or the fraction of void volume (free space) in the volume of filler layer. ε = 1 - α δ / 2, where δ is the thickness of corrugated plate (or net), unit: M.
⑧ Bulk density ρ P, the mass (or weight) of filler per cubic meter of packing layer, unit: kg / m3.
ρ P = (1 - ε) ρ m, where ρ m is the density of filler material, kg / m3.