Corrugated Metal Packing
A brief introduction to metal corrugated structured packing.
Corrugated Metal Packing
Structured metal packing is a high-efficiency tower packing material. It is made by pressing thin metal sheets into a corrugated shape and arranging them in a cross pattern to form a structured gas-liquid channel. It has advantages such as low pressure drop, high throughput, and high mass transfer efficiency, and is widely used in processes such as distillation and absorption.
Basic Structure
Structured metal packing consists of multiple stacked corrugated plates, with adjacent plates arranged at opposite angles.
Structural Elements | Description |
Corrugated Sheets | Pressed thin metal sheets (0.1-0.3mm thick), surface may be perforated or embossed. |
Corrugation Angle | The angle between the corrugations and the horizontal direction, typically 30°, 45°, or 60°. |
Cross-Arrangement | Adjacent corrugated sheets face opposite directions, forming V-shaped or X-shaped channels. |
Disc Assembly | Multiple corrugated sheets are bundled into a disc shape, diameter matching the tower body. |
Gas rises along the corrugated channel, while liquid flows down the corrugated surface. The two phases continuously contact each other on the corrugated surface, achieving efficient mass transfer.
Corrugation Types and Classifications
Based on corrugation angle:
X-type: ~30°, gentler channel, higher surface area and efficiency, but higher pressure drop. Suitable for high-purity distillation.
Y-type: 45°-60°, steeper channel, lower pressure drop and higher throughput. Suitable for absorption and washing.
Compromise type: Angle between X and Y (e.g., 45°) or mixed use in different column sections, balancing efficiency and pressure drop.
Typical Models and Performance
Model | Corrugated Type | Specific Surface Area (m²/m³) | Pressure Drop | Theoretical Plate Count (plates/m) | Application |
125X | X-type | 125 | Low | 0.8-1.2 | High flux absorption |
250X | X-type | 250 | Medium | 1.5-2.5 | Medium separation requirements |
350X | X-type | 350 | Higher | 2.5-3.5 | Higher separation requirements |
125Y | Y-type | 125 | Extremely low | 1.0-1.5 | Extremely sensitive to pressure drop |
250Y | Y-type | 250 | Low | 2.0-3.0 | Most versatile, best balance |
350Y | Y-type | 350 | Medium | 3.0-4.0 | High efficiency requirements |
500Y | Y型 | 500 | Higher | 4.0-5.0 | High precision separation |
The X-type has a higher theoretical plate count than the Y-type of the same specification, but also a higher pressure drop. 250Y is the most common model, suitable for most distillation and absorption processes.
Surface Treatment and Improvements
Punching：Punching holes (2-5mm) improves lateral mixing and reduces wall flow, with slight efficiency loss.
Embossing：Fine embossed textures increase surface roughness, improving wettability and mass transfer efficiency.
Windowing：Windows with folded edges form tongues, enhancing gas-liquid turbulence (similar to Pall rings).
Material Selection：Stainless steel (304, 316L) is standard; titanium for high corrosion resistance; aluminum for low-temperature applications.
Applicable Scenarios
Model | Typical Application |
125Y | High-throughput absorption, scrubbing, cooling towers |
250Y | Distillation, absorption, stripping (most common) |
350Y-500Y | High-purity distillation, fine chemical separation |
X型 | Applications requiring high theoretical plate counts |
Summary
The performance of structured metal packing is determined by the corrugation type (angle), specific surface area, and surface treatment. Selection requires comprehensive consideration of separation requirements, pressure drop limitations, and tower diameter. Structured packing offers more significant advantages in large towers. We are a metal packing supplier in China. For more information, please contact us via email at annayu@169chem.net or WhatsApp at +8618909016373.