Enhanced Deck and Advanced Chordal Downcomer High Performance Trays

Our high performance trays combine special tray decks for superior vapor capacity with advanced chordal downcomer technology for increased liquid capacity.

Information

Sulzer “Plus” Technology

VGPlus™ and UFMPlus™ Trays, are Sulzer’s high performance “Plus” Technology chordal downcomer trays. They offer industry proven and validated advanced tray technology for today’s market.

Sulzer “Plus” Technology make use of enhanced downcomers technology trays such as highly sloped, Truncated, StepArc™ (stepped) and ModArc™ (multi-chordal) downcomers, as well as enhanced tray decks equipped with high capacity MVG™ fixed valves or UFM™ Float valves.

UFMPlus™ trays

UFMPlus trays are Sulzer’s high performance chordal downcomer trays with UFM tray decks and enhanced downcomers. Among the chordal downcomer trays, UFMPlus trays offer highest capacity while maintaining high mass transfer efficiency. Being float valve trays, UFMPlus trays offer better turndown than fixed valve trays, i.e. up to 5:1. 

Key characteristics

  • High Capacity UFM valves
  • High Performance downcomers – truncated, StepArc or ModArc
  • Redirecting and froth promoting devices such as push valves and baffle bars 

Advantages to conventional trays

  • Higher capacity: up to 30%
  • Equal or higher mass transfer efficiency
  • Lower hydraulic gradient
  • More uniform liquid flow
  • More uniform vapor distribution

1 pass UFMPlus with StepArc downcomer and push valve

VGPlus™ trays

VGPlus trays are Sulzer’s high performance chordal downcomer trays with MVG or MMVG tray decks and enhanced downcomers. They offer industry-proven and Fractionator Research Inc (FRI) validated advanced tray technology for today’s market.

Key characteristics

  • High Capacity MVG or MMVG fixed valves
  • High Performance downcomers – truncated, StepArc or ModArc
  • Redirecting and froth promoting devices such as push valves and baffle bars

Advantages compared to conventional trays

  • Higher capacity: up to 30% 
  • Lower pressure drop: up to 20% 
  • Equal or higher mass transfer efficiency 
  • Lower hydraulic gradient 
  • More uniform liquid flow 
  • More uniform vapor distribution 
  • More uniform L/V on tray deck 
  • Higher fouling resistance

1-pass VGPlus with baffle bars and SteparcTM (stepped-multi-chordal) downcomer

FRI validation

  • Superiority of VGPlus tray technology has been confirmed by independent experiments at FRI 
  • VGPlus has been tested in the 1.2m diameter FRI tower at 7 and 11bar with i-C4/n-C4 system 
  • VGPlus provided up to 10% higher capacity compared to competitors’ high performance tray 
  • VGPlus tray efficiency was up to 15% higher than that of competitors’ high performance tray 
  • VGPlus is one of the best chordal downcomer trays ever tested at FRI

FRI test results

New ways in tray development

  • Computational Fluid Dynamics (CFD) supported classical research and pilot testing in developing the VGPlus trays 
  • CFD allows complex two-phase phenomena to be studied, e.g. froth flow and liquid entrainment

CFD results

VG AF™ trays

VG AF (Anti Fouling Trays) are part of the VGPlus tray family and are especially designed for fouling services. They provide superior anti-fouling performance, while delivering high capacity and efficiency, thus making these trays ideal for debottlenecking fouling services.  

Key characteristics

  • Large fixed valves to minimize plugging
  • Enhanced downcomer designs
  • Redirecting and froth promoting push valves to minimize stagnation zones

2-pass VG AF with push valves

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Applications