Reticulate pattern type polytetrafluoroethylene corrugated structured packing
By designing a textured PTFE corrugated structured packing, the problem of insufficient gas-liquid contact in Pall ring packing was solved, resulting in higher mass transfer efficiency and throughput.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2026-03-20
AI Technical Summary
Insufficient gas-liquid contact in Pall ring packings leads to low mass transfer efficiency and fails to fully utilize their production capacity.
Design a textured PTFE corrugated structured packing, including a cylindrical packing body, gas-liquid channels, staggered outer and inner windows, an inner ring and tongue, and staggered micro-convex textures on the outer and inner surfaces, which are formed and bonded by mechanical pressure rollers.
It increases the specific surface area by more than 20%, resulting in more complete gas-liquid contact, higher mass transfer efficiency, and increased throughput.
Smart Images
Figure CN224009833U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to industrial packing materials, and more particularly to a textured PTFE corrugated structured packing material. Background Technology
[0002] Pall ring packing is widely used in industrial distillation, absorption and washing towers, contact reaction towers, and vacuum distillation towers due to its advantages such as high throughput, low resistance, high separation efficiency, and high operational flexibility. Under the same pressure reduction, its throughput can be more than 50% greater than that of Raschig rings. At the same throughput, the pressure reduction can be halved, and the mass transfer efficiency can be improved by about 1%. Because the perforated ring wall of Pall rings significantly improves the gas-liquid distribution compared to Raschig rings, although Pall ring packing offers increased production capacity, enhanced resistance, and greater operational flexibility, the inner and outer surface areas of the Pall ring wall are still not high enough. This results in insufficient gas-liquid contact between the inner and outer surfaces of the outer cylinder, failing to achieve adequate exchange and thus not fully utilizing the packing material. Utility Model Content
[0003] In view of the shortcomings of the existing Pall ring packings, this utility model provides a textured PTFE corrugated structured packing that is not only compact and easy to manufacture, but also has a higher specific surface area, more complete gas-liquid contact exchange, higher mass transfer effect, and increased throughput.
[0004] The technical solution adopted by this utility model to solve the technical problem is: a mesh-type PTFE corrugated structured packing, which includes a packing body, the packing body being cylindrical, and several layers of gas-liquid channels being spaced apart on the cylinder of the packing body. Each layer of gas-liquid channels includes outer windows spaced apart along the radial direction of the packing body on the cylinder, and the outer windows on adjacent layers being staggered. Tongues are spaced apart inside the cylinder at the location of the gas-liquid channels. One end of each tongue is connected to the cylinder between the outer windows, and the other end is connected to the inner ring. An inner flow hole is provided in the middle of the inner ring. An inner window communicating with both the inner flow hole and the inner cavity of the cylinder is provided on the inner ring between the tongues. Mesh-like micro-convexities 5 are respectively provided on the outer surface and inner surface of the cylinder.
[0005] The cross-section of the micro-convex texture is triangular, square, or arc-shaped, preferably triangular. The spacing between the micro-convex textures is 3-6 mm, and the height of the micro-convex textures is 0.5-1.2 mm. The outer window is preferably a flat rectangle, but it can also be square, trapezoidal, etc.
[0006] The tongue is arc-shaped and is formed by punching PTFE plastic. The other end of the tongue on the same layer is smoothly connected to the inner ring.
[0007] The packing body has a mesh-like pattern of micro-protrusions on its inner and outer surfaces. These protrusions are formed by rotating and pressing a PTFE (polytetrafluoroethylene) plastic sheet onto a mechanical pressure roller using mesh-like protrusions. The outer window and tongue are then punched out, and the processed plastic sheet is bent and glued together to form a cylindrical shape. One end (inner end) of the PTFE tongue is then glued to the inner ring to form a single unit. The inner ring with the tongue is then fitted into the inner cavity of the cylinder using a colloid. After the colloid cures, a mesh-like PTFE corrugated structured packing is formed.
[0008] The technical advantages of this utility model are that it is not only compact and easy to manufacture, but also its specific surface area is increased by more than 20% compared with the existing Pall ring packing of the same specification. Because the packing is provided with external windows, internal windows and internal flow holes, it can make gas-liquid contact exchange more complete, the mass transfer effect is higher, and the gas-liquid exchange capacity is increased. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the main structure of this utility model.
[0010] Figure 2 yes Figure 1 AA cross-sectional structural diagram
[0011] Figure 3 yes Figure 1 A schematic diagram of a partial cross-sectional view of BB.
[0012] In the figure, 1. Packing body; 2. Outer window; 3. Cylinder; 4. Tongue; 5. Mesh micro-convexity; 6. Inner flow hole; 7. Inner ring; 8. Inner window. Detailed Implementation
[0013] The figure shows a type of corrugated PTFE packing material, comprising a packing body 1, which is cylindrical. Two layers of gas-liquid channels are spaced apart on the cylindrical body 3 (i.e., the outer wall). The gas-liquid channels on adjacent layers are staggered. Each layer of gas-liquid channels includes six external windows 2 spaced radially along the cylindrical body. The external windows are flattened rectangles (length to width ratio of 4–6:1). The external windows on adjacent layers are staggered vertically. The cylindrical body at the location of the gas-liquid channels... The inner partition is provided with two (or three) layers of tongues 4 (arc-shaped), with 6 tongues in each layer (or 4 or 5, etc.). One end of each tongue is connected to the cylinder between the window and the inner ring 7 with adhesive, and the other end is connected to the inner ring 7 with adhesive. The inner ring 7 has an internal flow hole 6 in the middle. The inner ring 7 between the tongues has an inner window 8 that communicates with the internal flow hole and the inner cavity of the cylinder. The outer and inner windows are preferably trumpet-shaped. The outer and inner surfaces of the cylinder 3 are respectively provided with interlocking mesh-like micro-protrusions 5. The tongue 4 (which can also be a straight tongue) has one end connected to the window as a whole, and the other end extends into the inner cavity of the packing body and is smoothly connected to the inner ring 7. The outer and inner surfaces of the packing body are respectively provided with interlocking mesh-like micro-protrusions 5 formed by mechanical toothed pressure rollers. The maximum height of the mesh-like micro-protrusions is 0.5-1.2 mm. The minimum spacing between the micro-convex textures is 3-6 mm, and the cross-section of the micro-convex textures is triangular, arc-shaped, square, etc., preferably triangular. The window is preferably a flat rectangle, but can also be square, trapezoidal, etc. The tongue is formed by punching three sides (two long sides and one short side) through the arc-shaped window. All tongues on the same layer are fixed to the cylinder between one end and the outer window with glue, and the other end is smoothly fixed to the inner ring with glue.
[0014] This utility model has the following various specifications:
[0015] 1. The cylinder has a diameter of φ25 mm, a height of 25 mm, and a wall thickness of 1.5 mm. The specific surface area is 192 m² / m³, and the porosity is 90%.
[0016] 2. The cylinder has a diameter of φ40 mm, a height of 40 mm, and a wall thickness of 1.5 mm. The specific surface area is 176 m² / m³, and the porosity is 86.3%.
[0017] 3. The cylinder has a diameter of φ50 mm, a height of 60 mm, and a wall thickness of 1.6 mm. The specific surface area is 158, and the porosity is 82.1%.
[0018] 4. The cylinder has a diameter of φ70 mm, a height of 70 mm, and a wall thickness of 1.8 mm. The specific surface area is 150.3, and the porosity is 80.3%.
Claims
1. A type of corrugated PTFE structured packing, comprising a packing body (1), wherein the packing body is cylindrical, characterized in that: The packing body has several layers of gas-liquid channels spaced apart on the cylinder (3). Each layer of gas-liquid channels includes an outer window (2) spaced apart on the cylinder along the radial direction of the packing body. The outer windows on adjacent layers are staggered. Tongues (4) are spaced apart inside the cylinder at the location of each layer of gas-liquid channels. One end of each tongue is connected to the cylinder between the outer windows and the other end is connected to the inner ring. An inner flow hole (6) is provided in the middle of the inner ring. An inner window (8) is provided on the inner ring between the tongues, which is connected to both the inner flow hole and the inner cavity of the cylinder. Interlocking mesh micro-convexities (5) are provided on the outer surface and inner surface of the cylinder.
2. The textured PTFE corrugated structured packing according to claim 1, characterized in that: The cross-section of the micro-convex mesh (5) is triangular, square or arc-shaped.
3. The textured PTFE corrugated structured packing according to claim 1, characterized in that: The outer window (2) is a flat rectangle.