Engineered for Extreme Fouling
Metal Dual Flow Trays eliminate downcomers entirely, utilizing large perforations (Ø12-25mm) that enable simultaneous vapor/liquid passage. This self-scouring action delivers unmatched fouling resistance in polymerizing/slurry services like PVC stripping towers and refinery vacuum sections – where conventional trays would fail within months.
Core Technical Specifications
| Parameter | Performance Metric |
|---|---|
| Hole Diameter | 12-25mm (anti-clogging design) |
| Open Area | 15-30% |
| Turndown Ratio | 2:1 |
| Max Fouling Tolerance | Slurries ≤40% solids |
| Material Options | CS/SS316L/Alloy 20/Hastelloy® |
| Pressure Drop | 0.5-1.0 kPa/tray |
(No downcomers = zero downcomer flooding risk)
Operational Advantages
- Clog-Proof Design: Large holes prevent buildup in polymerizing media
- Slurry Compatibility: Handles PVC/PS/PET slurries with ≤5mm particulates
- Hydraulic Self-Cleaning: Counter-current flows scour hole surfaces continuously
- Cost Efficiency: 40% cheaper than valve trays (no complex assemblies)
- High Capacity: 20% more vapor throughput vs. conventional sieve trays
Performance Tradeoffs
| Advantage | Compromise |
|---|---|
| Fouling Immunity | Limited Turndown (2:1) |
| Simplified Construction | Reduced Efficiency (60-70% Murphree) |
| No Downcomer Flooding | Higher Entrainment at Flood Point |
Industrial Applications
► Polymer Production
- PVC slurry stripping towers
- PS devolatilization stages
- PET polycondensation reactors
► Refining Fouling Services
- Vacuum residue tower flash zones
- Coker fractionator wash sections
- Asphalt oxidation columns
► Specialty Processes
- Brewery beer stills
- Lignin precipitation tanks
- Tar distillation columns
