What is the function of structured packing

The main types and specifications of structured fillers are as follows:

I. Main types

Corrugated packing

Wire mesh corrugated packing: made of wire mesh, low pressure, high separation efficiency, suitable for difficult to separate material system and vacuum rectification.

Corrugated metal plate packing: plate with small holes, uniform distribution of gas and liquid, suitable for large diameter tower and high pressure scene.

Punctured corrugated packing: the surface has dense punctured holes, strong plugging resistance, close to the performance of wire mesh corrugated, but the cost is lower.

Plastic corrugated filler: lightweight, corrosion resistant, used in gas purification and environmental protection.

Non-corrugated packing

Grid packing: including Grich grid (low pressure drop, large flux) and mesh grid (low cost, anti-blocking).

Plate type packing: such as pulse packing, composed of hollow prism, the flow channel alternately contracted and expanded, suitable for large column diameter and vacuum rectification.

Special type

Goodloe packing: wire mesh corrugations, small liquid holdup, reduced pressure, for heat sensitive material systems.

Ring torque saddle packing: combined with the advantages of ring and saddle shape, comprehensive performance is excellent, widely used in industry.

2. Specification parameters

Specific surface area (a)

Definition: The surface area per unit volume of the filler directly affects the mass transfer efficiency.

Typical range: 125~700 m²/m³, the higher the value, the higher the efficiency (such as metal mesh ripples up to 700 m²/m³).

Void ratio (e)

Definition: The void volume ratio of the packing layer affects the pressure drop and flux.

Typical range: 85%~97%, structured packing void ratio is generally higher than bulk packing.

Filling factor (f)

Formula: f = a/e³, reflecting the hydrodynamic properties.

Typical range:

Low f value (20~30 1/m) : such as wire mesh ripples, low pressure drop, high efficiency.

High f value (80~100 1/m) : such as grid packing, high flux, strong plugging resistance.

Material and size

Material: Metal (stainless steel, titanium alloy), plastic (PP, PVDF), ceramic (high temperature resistance).

Size:

Corrugated packing: plate thickness 0.12~ 0.2mm (plastic), specific surface area specifications such as 250X (250 m²/m³, 30° inclination).

Grid packing: opening rate 8%~15%, aperture 5~10 mm.

3. Application scenario adaptation

Type Application Scenario Typical specifications

Wire mesh corrugated vacuum distillation, heat sensitive material 400X (400 m²/m³, 30°)

Large diameter tower with corrugated orifice plate, high pressure operation 350Y (350 m²/m³, 45°)

Grich grid high load, blocking scene opening rate 12%, aperture 8 mm

Pulse packing large column diameter, vacuum distillation specific surface area of 250~350 m²/m³

Sum up

The type and specification of structured packing should be selected according to the process conditions (temperature, pressure, medium) and the separation target (efficiency, pressure drop). The corrugated packing of Hengerwo Chemical focuses on efficient separation, the non-corrugated packing focuses on low pressure drop, and the pulse packing is suitable for large flux scenes.