Introduction to Structured Packing
Release Date:
2015-12-07
1. Orifice plate corrugation:
The ZUPAC series of bi-directional metal corrugated packing features structural optimization that enhances gas–liquid flow paths and boosts mass-transfer efficiency; increased porosity leads to higher throughput and lower pressure drop; enhanced specific surface area results in a corresponding increase in the number of theoretical plates; the packing exhibits excellent resistance to fouling and high structural rigidity, delivering superior mass- and heat-transfer performance.
These performance characteristics help to enhance the separation efficiency and processing capacity of each distillation column, reduce pressure drop across the columns, and ensure that the design objectives for improving the quality of side-stream products, increasing the recovery rate, and boosting processing capacity are met.
The application of ZUPAC series structured packings will also ensure that each column can operate normally over a wide range of operating flexibility. Currently, modular packed beds have been implemented in the vacuum distillation column of the largest domestically designed refinery unit.
2. Silk-screen corrugation:
Structured wire-mesh corrugated packing represents a significant milestone in the development of structured packings. This type of packing is constructed by arranging corrugated wire-mesh sheets, with corrugation angles of 30° or 45° and adjacent corrugation planes oriented in opposite directions. During installation in the column, successive layers of packing are staggered by 90°. Metal wire-mesh corrugated packing features a large specific surface area, high porosity, and light weight; its gas-flow channels have small, well-defined inclinations, resulting in high efficiency, low pressure drop, and high throughput. It also exhibits excellent radial diffusion, thorough gas–liquid contact, virtually no lower-load limit, and broad operational flexibility. Available in BX and CY types, it is commonly used in vacuum distillation of difficult-to-separate and heat-sensitive mixtures, as well as in atmospheric distillation and absorption processes.
3. Mesh Corrugation:
Mesh-structured corrugated packing is produced by punching diamond-shaped micro-holes in a metal sheet and then stretching it into a mesh configuration, thereby combining the advantages of wire mesh and perforated plate corrugated packing.
4. Perforated corrugation:
Pierced-plate corrugated packing is a structured packing made by first roll-pressing metal sheets to form densely packed micro-piercings, then pressing them into corrugated plates and assembling them. The unique micro-porous structure on the surface enhances the wetting performance of the packing while preserving the performance characteristics of wire-mesh corrugated packing.
5. Grated packing:
Grid packings are constructed by arranging strip-shaped unit elements in a specific, regular pattern; common configurations include Greer grid packings, mesh-grid packings, and honeycomb grid packings. Due to their relatively low specific surface area, grid packings are primarily used in applications that demand low pressure drop, high loading capacity, and resistance to fouling.
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