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Views: 1 Author: Site Editor Publish Time: 2025-08-20 Origin: Site
Metal Cascade Mini Rings represent a specific category of random packing used in mass transfer operations across chemical processing industries. This technical examination covers their design specifications, performance data, and industrial applications, supported by empirical research and engineering standards.
Cascade Mini Rings are characterized by their open-ring structure with internal baffles, designed to optimize fluid distribution and interfacial area. Typical specifications include:
1.1 Dimensional Parameters
Standard sizes: 16 mm, 25 mm, 38 mm, and 50 mm diameters
Surface area: 220-360 m²/m³ (size dependent)
Void fraction: 92-97%
Wall thickness: 0.4-1.2 mm (material dependent)
1.2 Material Composition
304/316/L stainless steel: Cr18Ni9/Cr17Ni12Mo2
Nickel alloys: Monel 400 (Ni-Cu), Inconel 600 (Ni-Cr-Fe)
Titanium Grade 2: Ti >99%
Carbon steel: Q235 with various coatings
Material selection follows ASTM standards:
ASTM A240 (stainless steels)
ASTM B164 (nickel alloys)
ASTM B265 (titanium)
2.1 Hydraulic Characteristics
Experimental data from distillation column studies demonstrate:
Pressure drop: 20-100 Pa/m theoretical stage
Liquid load capacity: 0.5-80 m³/(m²h)
F-factor operating range: 0.5-3.0 Pa⁰·⁵
2.2 Efficiency Parameters
Height Equivalent to Theoretical Plate (HETP): 0.3-0.6 m
Number of Theoretical Stages per Meter (NTSM): 1.7-3.3
Mass transfer coefficients: 0.02-0.08 m/s (vapor phase)
Comparative studies show:
15-25% lower HETP compared to Pall Rings
20-30% reduced pressure drop versus Raschig Rings
10-15% improved efficiency in absorption operations
3.1 Primary Application Areas
Distillation columns (atmospheric and vacuum)
Absorption column (acid gas removal)
Stripping operations (volatile organic compounds)
Liquid-liquid extraction columns
3.2 Design Operating Conditions
Temperature range: -200°C to +600°C (material dependent)
Pressure range: High vacuum to 50 bar
pH compatibility: 2-12 (stainless steel)
Maximum surface velocity: 0.8-1.2 m/s
A 2022 study comparing random packing types in methanol-water distillation showed:
Cascade Mini Rings achieved 18% higher efficiency than Pall Rings
22% lower pressure drop compared to Raschig Rings
15% better liquid distribution than Intalox Saddles
Fouling resistance 30% higher than structured packing
Long-term operational data indicate:
Typical service life: 8-15 years (depending on service conditions)
Cleaning frequency: 50-70% less than structured packing
Material loss: <0.1% per year in most applications
Inspection intervals: 24-36 months recommended
Metal Cascade Mini Rings offer a technically viable solution for various mass transfer operations, with documented performance advantages in specific applications. Their selection should be based on comprehensive process analysis and economic evaluation. Wangdu (Hebei) Chemical Engineering Co., LTD employs these engineering principles in providing appropriate solutions for chemical processing requirements.
Reference
Stichlmair, J., & Bravo, J.L. (2023). "Random Packing Performance in Distillation Columns." Chemical Engineering Research and Design, 185, 234-245.
American Society for Testing and Materials. (2022). ASTM Standards for Process Column Packing. ASTM PC-2022.
Wang, H., et al. (2022). "Comparative Analysis of Random Packing in Methanol Distillation." Industrial & Engineering Chemistry Research, 61(18), 6234-6245.
European Federation of Chemical Engineering. (2021). EFCE Testing Methods for Random Packing. 3rd Edition.
Zhang, R., et al. (2023). "Long-term Performance of Metal Packing in Chemical Processes." Journal of Process Engineering, 45(2), 112-125.
International Standards Organization. (2021). *ISO 13798: Metal packing for process columns - Specifications and testing*.
